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/* uLisp ARM Version 2.5a - www.ulisp.com
David Johnson-Davies - www.technoblogy.com - 1st December 2018
Licensed under the MIT license: https://opensource.org/licenses/MIT
*/
// Compile options
// #define resetautorun
#define printfreespace
#define serialmonitor
// #define printgcs
// #define sdcardsupport
// #define lisplibrary
// Includes
// #include "LispLibrary.h"
#include <setjmp.h>
#include <SPI.h>
#include <Wire.h>
#include <limits.h>
#if defined(sdcardsupport)
#include <SD.h>
#define SDSIZE 172
#else
#define SDSIZE 0
#endif
// C Macros
#define nil NULL
#define car(x) (((object *) (x))->car)
#define cdr(x) (((object *) (x))->cdr)
#define first(x) (((object *) (x))->car)
#define second(x) (car(cdr(x)))
#define cddr(x) (cdr(cdr(x)))
#define third(x) (car(cdr(cdr(x))))
#define push(x, y) ((y) = cons((x),(y)))
#define pop(y) ((y) = cdr(y))
#define integerp(x) ((x) != NULL && (x)->type == NUMBER)
#define floatp(x) ((x) != NULL && (x)->type == FLOAT)
#define symbolp(x) ((x) != NULL && (x)->type == SYMBOL)
#define stringp(x) ((x) != NULL && (x)->type == STRING)
#define characterp(x) ((x) != NULL && (x)->type == CHARACTER)
#define streamp(x) ((x) != NULL && (x)->type == STREAM)
#define mark(x) (car(x) = (object *)(((uintptr_t)(car(x))) | MARKBIT))
#define unmark(x) (car(x) = (object *)(((uintptr_t)(car(x))) & ~MARKBIT))
#define marked(x) ((((uintptr_t)(car(x))) & MARKBIT) != 0)
#define MARKBIT 1
#define setflag(x) (Flags = Flags | 1<<(x))
#define clrflag(x) (Flags = Flags & ~(1<<(x)))
#define tstflag(x) (Flags & 1<<(x))
// Constants
const int TRACEMAX = 3; // Number of traced functions
enum type { ZERO=0, SYMBOL=2, NUMBER=4, STREAM=6, CHARACTER=8, FLOAT=10, STRING=12, PAIR=14 }; // STRING and PAIR must be last
enum token { UNUSED, BRA, KET, QUO, DOT };
enum stream { SERIALSTREAM, I2CSTREAM, SPISTREAM, SDSTREAM };
enum function { SYMBOLS, NIL, TEE, NOTHING, AMPREST, LAMBDA, LET, LETSTAR, CLOSURE, SPECIAL_FORMS, QUOTE,
DEFUN, DEFVAR, SETQ, LOOP, PUSH, POP, INCF, DECF, SETF, DOLIST, DOTIMES, TRACE, UNTRACE, FORMILLIS,
WITHSERIAL, WITHI2C, WITHSPI, WITHSDCARD, TAIL_FORMS, PROGN, RETURN, IF, COND, WHEN, UNLESS, AND, OR,
FUNCTIONS, NOT, NULLFN, CONS, ATOM, LISTP, CONSP, SYMBOLP, STREAMP, EQ, CAR, FIRST, CDR, REST, CAAR, CADR,
SECOND, CDAR, CDDR, CAAAR, CAADR, CADAR, CADDR, THIRD, CDAAR, CDADR, CDDAR, CDDDR, LENGTH, LIST, REVERSE,
NTH, ASSOC, MEMBER, APPLY, FUNCALL, APPEND, MAPC, MAPCAR, ADD, SUBTRACT, MULTIPLY, DIVIDE, MOD, ONEPLUS,
ONEMINUS, ABS, RANDOM, MAXFN, MINFN, NOTEQ, NUMEQ, LESS, LESSEQ, GREATER, GREATEREQ, PLUSP, MINUSP, ZEROP,
ODDP, EVENP, INTEGERP, NUMBERP, FLOATFN, FLOATP, SIN, COS, TAN, ASIN, ACOS, ATAN, SINH, COSH, TANH, EXP,
SQRT, LOG, EXPT, CEILING, FLOOR, TRUNCATE, ROUND, CHAR, CHARCODE, CODECHAR, CHARACTERP, STRINGP, STRINGEQ,
STRINGLESS, STRINGGREATER, SORT, STRINGFN, CONCATENATE, SUBSEQ, READFROMSTRING, PRINCTOSTRING,
PRIN1TOSTRING, LOGAND, LOGIOR, LOGXOR, LOGNOT, ASH, LOGBITP, EVAL, GLOBALS, LOCALS, MAKUNBOUND, BREAK,
READ, PRIN1, PRINT, PRINC, TERPRI, READBYTE, READLINE, WRITEBYTE, WRITESTRING, WRITELINE, RESTARTI2C, GC,
ROOM, SAVEIMAGE, LOADIMAGE, CLS, PINMODE, DIGITALREAD, DIGITALWRITE, ANALOGREAD, ANALOGWRITE, DELAY,
MILLIS, SLEEP, NOTE, EDIT, PPRINT, PPRINTALL, ENDFUNCTIONS };
// Typedefs
typedef unsigned int symbol_t;
typedef struct sobject {
union {
struct {
sobject *car;
sobject *cdr;
};
struct {
unsigned int type;
union {
symbol_t name;
int integer;
float single_float;
};
};
};
} object;
typedef object *(*fn_ptr_type)(object *, object *);
typedef struct {
const char *string;
fn_ptr_type fptr;
uint8_t min;
uint8_t max;
} tbl_entry_t;
typedef int (*gfun_t)();
typedef void (*pfun_t)(char);
// Workspace
#define PERSIST __attribute__((section(".text")))
#define WORDALIGNED __attribute__((aligned (4)))
#define BUFFERSIZE 34 // Number of bits+2
#if defined(ARDUINO_SAMD_ZERO)
#define WORKSPACESIZE 3072-SDSIZE /* Cells (8*bytes) */
#define SYMBOLTABLESIZE 512 /* Bytes */
#define SDCARD_SS_PIN 10
uint8_t _end;
#elif defined(ARDUINO_SAM_DUE)
#define WORKSPACESIZE 10240-SDSIZE /* Cells (8*bytes) */
#define SYMBOLTABLESIZE 512 /* Bytes */
#define SDCARD_SS_PIN 10
extern uint8_t _end;
#elif defined(ARDUINO_SAMD_MKRZERO)
#define WORKSPACESIZE 3072-SDSIZE /* Cells (8*bytes) */
#define SYMBOLTABLESIZE 512 /* Bytes */
uint8_t _end;
#elif defined(ARDUINO_METRO_M4)
#define WORKSPACESIZE 20480-SDSIZE /* Cells (8*bytes) */
#define FLASHSIZE 65536 /* Bytes */
#define SYMBOLTABLESIZE 1024 /* Bytes */
uint8_t _end;
#elif defined(ARDUINO_ITSYBITSY_M4)
#define WORKSPACESIZE 20480-SDSIZE /* Cells (8*bytes) */
#define FLASHSIZE 65536 /* Bytes */
#define SYMBOLTABLESIZE 1024 /* Bytes */
uint8_t _end;
#elif defined(ARDUINO_FEATHER_M4)
#define WORKSPACESIZE 20480-SDSIZE /* Cells (8*bytes) */
#define FLASHSIZE 65536 /* Bytes */
#define SYMBOLTABLESIZE 1024 /* Bytes */
uint8_t _end;
#elif defined(_VARIANT_BBC_MICROBIT_)
#define WORKSPACESIZE 1280 /* Cells (8*bytes) */
#define SYMBOLTABLESIZE 512 /* Bytes */
uint8_t _end;
#endif
object Workspace[WORKSPACESIZE] WORDALIGNED;
char SymbolTable[SYMBOLTABLESIZE];
// Global variables
jmp_buf exception;
unsigned int Freespace = 0;
object *Freelist;
char *SymbolTop = SymbolTable;
unsigned int I2CCount;
unsigned int TraceFn[TRACEMAX];
unsigned int TraceDepth[TRACEMAX];
object *GlobalEnv;
object *GCStack = NULL;
object *GlobalString;
int GlobalStringIndex = 0;
char BreakLevel = 0;
char LastChar = 0;
char LastPrint = 0;
char PrintReadably = 1;
// Flags
enum flag { RETURNFLAG, ESCAPE, EXITEDITOR, LIBRARYLOADED };
volatile char Flags;
// Forward references
object *tee;
object *tf_progn (object *form, object *env);
object *eval (object *form, object *env);
object *read ();
void repl(object *env);
void printobject (object *form, pfun_t pfun);
char *lookupbuiltin (symbol_t name);
intptr_t lookupfn (symbol_t name);
int builtin (char* n);
// Set up workspace
void initworkspace () {
Freelist = NULL;
for (int i=WORKSPACESIZE-1; i>=0; i--) {
object *obj = &Workspace[i];
car(obj) = NULL;
cdr(obj) = Freelist;
Freelist = obj;
Freespace++;
}
}
object *myalloc () {
if (Freespace == 0) error(PSTR("No room"));
object *temp = Freelist;
Freelist = cdr(Freelist);
Freespace--;
return temp;
}
inline void myfree (object *obj) {
car(obj) = NULL;
cdr(obj) = Freelist;
Freelist = obj;
Freespace++;
}
// Make each type of object
object *number (int n) {
object *ptr = myalloc();
ptr->type = NUMBER;
ptr->integer = n;
return ptr;
}
object *makefloat (float f) {
object *ptr = myalloc();
ptr->type = FLOAT;
ptr->single_float = f;
return ptr;
}
object *character (char c) {
object *ptr = myalloc();
ptr->type = CHARACTER;
ptr->integer = c;
return ptr;
}
object *cons (object *arg1, object *arg2) {
object *ptr = myalloc();
ptr->car = arg1;
ptr->cdr = arg2;
return ptr;
}
object *symbol (symbol_t name) {
object *ptr = myalloc();
ptr->type = SYMBOL;
ptr->name = name;
return ptr;
}
object *newsymbol (symbol_t name) {
for (int i=WORKSPACESIZE-1; i>=0; i--) {
object *obj = &Workspace[i];
if (obj->type == SYMBOL && obj->name == name) return obj;
}
return symbol(name);
}
object *stream (unsigned char streamtype, unsigned char address) {
object *ptr = myalloc();
ptr->type = STREAM;
ptr->integer = streamtype<<8 | address;
return ptr;
}
// Garbage collection
void markobject (object *obj) {
MARK:
if (obj == NULL) return;
if (marked(obj)) return;
object* arg = car(obj);
unsigned int type = obj->type;
mark(obj);
if (type >= PAIR || type == ZERO) { // cons
markobject(arg);
obj = cdr(obj);
goto MARK;
}
if (type == STRING) {
obj = cdr(obj);
while (obj != NULL) {
arg = car(obj);
mark(obj);
obj = arg;
}
}
}
void sweep () {
Freelist = NULL;
Freespace = 0;
for (int i=WORKSPACESIZE-1; i>=0; i--) {
object *obj = &Workspace[i];
if (!marked(obj)) myfree(obj); else unmark(obj);
}
}
void gc (object *form, object *env) {
#if defined(printgcs)
int start = Freespace;
#endif
markobject(tee);
markobject(GlobalEnv);
markobject(GCStack);
markobject(form);
markobject(env);
sweep();
#if defined(printgcs)
pfl(pserial); pserial('{'); pint(Freespace - start, pserial); pserial('}');
#endif
}
// Compact image
void movepointer (object *from, object *to) {
for (int i=0; i<WORKSPACESIZE; i++) {
object *obj = &Workspace[i];
unsigned int type = (obj->type) & ~MARKBIT;
if (marked(obj) && (type >= STRING || type==ZERO)) {
if (car(obj) == (object *)((uintptr_t)from | MARKBIT))
car(obj) = (object *)((uintptr_t)to | MARKBIT);
if (cdr(obj) == from) cdr(obj) = to;
}
}
// Fix strings
for (int i=0; i<WORKSPACESIZE; i++) {
object *obj = &Workspace[i];
if (marked(obj) && ((obj->type) & ~MARKBIT) == STRING) {
obj = cdr(obj);
while (obj != NULL) {
if (cdr(obj) == to) cdr(obj) = from;
obj = (object *)((uintptr_t)(car(obj)) & ~MARKBIT);
}
}
}
}
int compactimage (object **arg) {
markobject(tee);
markobject(GlobalEnv);
markobject(GCStack);
object *firstfree = Workspace;
while (marked(firstfree)) firstfree++;
object *obj = &Workspace[WORKSPACESIZE-1];
while (firstfree < obj) {
if (marked(obj)) {
car(firstfree) = car(obj);
cdr(firstfree) = cdr(obj);
unmark(obj);
movepointer(obj, firstfree);
if (GlobalEnv == obj) GlobalEnv = firstfree;
if (GCStack == obj) GCStack = firstfree;
if (*arg == obj) *arg = firstfree;
while (marked(firstfree)) firstfree++;
}
obj--;
}
sweep();
return firstfree - Workspace;
}
// Make SD card filename
char *MakeFilename (object *arg) {
char *buffer = SymbolTop;
int i = 0;
do {
char c = nthchar(arg, i);
if (c == '\0') break;
buffer[i++] = c;
} while (i<12); // Truncate to 12 chars
buffer[i] = '\0';
return buffer;
}
// Save-image and load-image
#if defined(sdcardsupport)
void SDWriteInt (File file, int data) {
file.write(data & 0xFF); file.write(data>>8 & 0xFF);
file.write(data>>16 & 0xFF); file.write(data>>24 & 0xFF);
}
#elif defined(ARDUINO_METRO_M4) || defined(ARDUINO_ITSYBITSY_M4) || defined(ARDUINO_FEATHER_M4)
// Winbond DataFlash support for Adafruit M4 Express boards
#define PAGEPROG 0x02
#define READSTATUS 0x05
#define READDATA 0x03
#define WRITEENABLE 0x06
#define BLOCK64K 0xD8
#define READID 0x90
// Arduino pins used for dataflash
#if defined(ARDUINO_ITSYBITSY_M4)
const int sck = 32, ssel = 33, mosi = 34, miso = 35;
#elif defined(ARDUINO_METRO_M4)
const int sck = 41, ssel = 42, mosi = 43, miso = 44;
#elif defined(ARDUINO_FEATHER_M4)
const int sck = 34, ssel = 35, mosi = 36, miso = 37;
#endif
boolean FlashSetup () {
uint8_t manID, devID;
digitalWrite(ssel, HIGH); pinMode(ssel, OUTPUT);
pinMode(sck, OUTPUT);
pinMode(mosi, OUTPUT);
pinMode(miso, INPUT);
digitalWrite(sck, LOW); digitalWrite(mosi, HIGH);
digitalWrite(ssel, LOW);
FlashWrite(READID);
for(uint8_t i=0; i<4; i++) manID = FlashRead();
devID = FlashRead();
digitalWrite(ssel, HIGH);
return (devID == 0x14); // Found correct device
}
inline void FlashWrite (uint8_t data) {
shiftOut(mosi, sck, MSBFIRST, data);
}
void FlashBusy () {
digitalWrite(ssel, 0);
FlashWrite(READSTATUS);
while (FlashRead() & 1 != 0);
digitalWrite(ssel, 1);
}
void FlashWriteEnable () {
digitalWrite(ssel, 0);
FlashWrite(WRITEENABLE);
digitalWrite(ssel, 1);
}
void FlashBeginRead () {
FlashBusy();
digitalWrite(ssel, 0);
FlashWrite(READDATA);
FlashWrite(0); FlashWrite(0); FlashWrite(0);
}
inline uint8_t FlashRead () {
int data;
return shiftIn(miso, sck, MSBFIRST);
}
inline void FlashEndRead(void) {
digitalWrite(ssel, 1);
}
void FlashBeginWrite () {
FlashBusy();
// Erase 64K
FlashWriteEnable();
digitalWrite(ssel, 0);
FlashWrite(BLOCK64K);
FlashWrite(0); FlashWrite(0); FlashWrite(0);
digitalWrite(ssel, 1);
FlashBusy();
}
inline uint8_t FlashReadByte () {
return FlashRead();
}
void FlashWriteByte (unsigned int *addr, uint8_t data) {
// New page
if (((*addr) & 0xFF) == 0) {
digitalWrite(ssel, 1);
FlashBusy();
FlashWriteEnable();
digitalWrite(ssel, 0);
FlashWrite(PAGEPROG);
FlashWrite((*addr)>>16);
FlashWrite((*addr)>>8);
FlashWrite(0);
}
FlashWrite(data);
(*addr)++;
}
inline void FlashEndWrite (void) {
digitalWrite(ssel, 1);
}
void FlashWriteInt (unsigned int *addr, int data) {
FlashWriteByte(addr, data & 0xFF); FlashWriteByte(addr, data>>8 & 0xFF);
FlashWriteByte(addr, data>>16 & 0xFF); FlashWriteByte(addr, data>>24 & 0xFF);
}
#endif
int saveimage (object *arg) {
#if defined(sdcardsupport)
SD.begin(SDCARD_SS_PIN);
File file;
if (stringp(arg)) {
file = SD.open(MakeFilename(arg), O_RDWR | O_CREAT | O_TRUNC);
arg = NULL;
} else file = SD.open("ULISP.IMG", O_RDWR | O_CREAT | O_TRUNC);
if (!file) error(PSTR("Problem saving to SD card"));
unsigned int imagesize = compactimage(&arg);
SDWriteInt(file, (uintptr_t)arg);
SDWriteInt(file, imagesize);
SDWriteInt(file, (uintptr_t)GlobalEnv);
SDWriteInt(file, (uintptr_t)GCStack);
#if SYMBOLTABLESIZE > BUFFERSIZE
SDWriteInt(file, (uintptr_t)SymbolTop);
for (int i=0; i<SYMBOLTABLESIZE; i++) file.write(SymbolTable[i]);
#endif
for (unsigned int i=0; i<imagesize; i++) {
object *obj = &Workspace[i];
SDWriteInt(file, (uintptr_t)car(obj));
SDWriteInt(file, (uintptr_t)cdr(obj));
}
file.close();
return imagesize;
#elif defined(ARDUINO_METRO_M4) || defined(ARDUINO_ITSYBITSY_M4) || defined(ARDUINO_FEATHER_M4)
unsigned int imagesize = compactimage(&arg);
if (!FlashSetup()) error(PSTR("No DataFlash found."));
// Save to DataFlash
int bytesneeded = imagesize*8 + SYMBOLTABLESIZE + 20;
if (bytesneeded > FLASHSIZE) {
pfstring(PSTR("Error: Image size too large: "), pserial);
pint(imagesize, pserial); pln(pserial);
GCStack = NULL;
longjmp(exception, 1);
}
unsigned int addr = 0;
FlashBeginWrite();
FlashWriteInt(&addr, (uintptr_t)arg);
FlashWriteInt(&addr, imagesize);
FlashWriteInt(&addr, (uintptr_t)GlobalEnv);
FlashWriteInt(&addr, (uintptr_t)GCStack);
#if SYMBOLTABLESIZE > BUFFERSIZE
FlashWriteInt(&addr, (uintptr_t)SymbolTop);
for (int i=0; i<SYMBOLTABLESIZE; i++) FlashWriteByte(&addr, SymbolTable[i]);
#endif
for (unsigned int i=0; i<imagesize; i++) {
object *obj = &Workspace[i];
FlashWriteInt(&addr, (uintptr_t)car(obj));
FlashWriteInt(&addr, (uintptr_t)cdr(obj));
}
FlashEndWrite();
return imagesize;
#else
(void) arg;
error(PSTR("save-image not available"));
return 0;
#endif
}
#if defined(sdcardsupport)
int SDReadInt (File file) {
uintptr_t b0 = file.read(); uintptr_t b1 = file.read();
uintptr_t b2 = file.read(); uintptr_t b3 = file.read();
return b0 | b1<<8 | b2<<16 | b3<<24;
}
#elif defined(ARDUINO_METRO_M4) || defined(ARDUINO_ITSYBITSY_M4) || defined(ARDUINO_FEATHER_M4)
int FlashReadInt () {
uint8_t b0 = FlashReadByte(); uint8_t b1 = FlashReadByte();
uint8_t b2 = FlashReadByte(); uint8_t b3 = FlashReadByte();
return b0 | b1<<8 | b2<<16 | b3<<24;
}
#endif
int loadimage (object *filename) {
#if defined(sdcardsupport)
SD.begin(SDCARD_SS_PIN);
File file;
if (stringp(filename)) file = SD.open(MakeFilename(filename));
else file = SD.open("ULISP.IMG");
if (!file) error(PSTR("Problem loading from SD card"));
SDReadInt(file);
int imagesize = SDReadInt(file);
GlobalEnv = (object *)SDReadInt(file);
GCStack = (object *)SDReadInt(file);
#if SYMBOLTABLESIZE > BUFFERSIZE
SymbolTop = (char *)SDReadInt(file);
for (int i=0; i<SYMBOLTABLESIZE; i++) SymbolTable[i] = file.read();
#endif
for (int i=0; i<imagesize; i++) {
object *obj = &Workspace[i];
car(obj) = (object *)SDReadInt(file);
cdr(obj) = (object *)SDReadInt(file);
}
file.close();
gc(NULL, NULL);
return imagesize;
#elif defined(ARDUINO_METRO_M4) || defined(ARDUINO_ITSYBITSY_M4) || defined(ARDUINO_FEATHER_M4)
if (!FlashSetup()) error(PSTR("No DataFlash found."));
FlashBeginRead();
FlashReadInt(); // Skip eval address
int imagesize = FlashReadInt();
if (imagesize == 0 || imagesize == 0xFFFF) error(PSTR("No saved image"));
GlobalEnv = (object *)FlashReadInt();
GCStack = (object *)FlashReadInt();
#if SYMBOLTABLESIZE > BUFFERSIZE
SymbolTop = (char *)FlashReadInt();
for (int i=0; i<SYMBOLTABLESIZE; i++) SymbolTable[i] = FlashReadByte();
#endif
for (int i=0; i<imagesize; i++) {
object *obj = &Workspace[i];
car(obj) = (object *)FlashReadInt();
cdr(obj) = (object *)FlashReadInt();
}
gc(NULL, NULL);
FlashEndRead();
return imagesize;
#else
(void) filename;
error(PSTR("load-image not available"));
return 0;
#endif
}
void autorunimage () {
#if defined(sdcardsupport)
SD.begin(SDCARD_SS_PIN);
File file = SD.open("ULISP.IMG");
if (!file) error(PSTR("Error: Problem autorunning from SD card"));
object *autorun = (object *)SDReadInt(file);
object *nullenv = NULL;
file.close();
if (autorun != NULL) {
loadimage(NULL);
apply(autorun, NULL, &nullenv);
}
#elif defined(ARDUINO_METRO_M4) || defined(ARDUINO_ITSYBITSY_M4) || defined(ARDUINO_FEATHER_M4)
if (!FlashSetup()) error(PSTR("No DataFlash found."));
object *nullenv = NULL;
FlashBeginRead();
object *autorun = (object *)FlashReadInt();
FlashEndRead();
if (autorun != NULL && (unsigned int)autorun != 0xFFFF) {
loadimage(nil);
apply(autorun, NULL, &nullenv);
}
#else
error(PSTR("autorun not available"));
#endif
}
// Error handling
void error (const char *string) {
pfl(pserial); pfstring(PSTR("Error: "), pserial);
pfstring(string, pserial); pln(pserial);
GCStack = NULL;
longjmp(exception, 1);
}
void error2 (object *symbol, const char *string) {
pfl(pserial); pfstring(PSTR("Error: "), pserial);
if (symbol == NULL) pfstring(PSTR("function "), pserial);
else { pserial('\''); printobject(symbol, pserial); pfstring(PSTR("' "), pserial); }
pfstring(string, pserial); pln(pserial);
GCStack = NULL;
longjmp(exception, 1);
}
// Tracing
boolean tracing (symbol_t name) {
int i = 0;
while (i < TRACEMAX) {
if (TraceFn[i] == name) return i+1;
i++;
}
return 0;
}
void trace (symbol_t name) {
if (tracing(name)) error(PSTR("Already being traced"));
int i = 0;
while (i < TRACEMAX) {
if (TraceFn[i] == 0) { TraceFn[i] = name; TraceDepth[i] = 0; return; }
i++;
}
error(PSTR("Already tracing 3 functions"));
}
void untrace (symbol_t name) {
int i = 0;
while (i < TRACEMAX) {
if (TraceFn[i] == name) { TraceFn[i] = 0; return; }
i++;
}
error(PSTR("It wasn't being traced"));
}
// Helper functions
boolean consp (object *x) {
if (x == NULL) return false;
unsigned int type = x->type;
return type >= PAIR || type == ZERO;
}
boolean atom (object *x) {
if (x == NULL) return true;
unsigned int type = x->type;
return type < PAIR && type != ZERO;
}
boolean listp (object *x) {
if (x == NULL) return true;
unsigned int type = x->type;
return type >= PAIR || type == ZERO;
}
int toradix40 (char ch) {
if (ch == 0) return 0;
if (ch >= '0' && ch <= '9') return ch-'0'+30;
ch = ch | 0x20;
if (ch >= 'a' && ch <= 'z') return ch-'a'+1;
return -1; // Invalid
}
int fromradix40 (int n) {
if (n >= 1 && n <= 26) return 'a'+n-1;
if (n >= 30 && n <= 39) return '0'+n-30;
return 0;
}
int pack40 (char *buffer) {
return (((toradix40(buffer[0]) * 40) + toradix40(buffer[1])) * 40 + toradix40(buffer[2]));
}
boolean valid40 (char *buffer) {
return (toradix40(buffer[0]) >= 0 && toradix40(buffer[1]) >= 0 && toradix40(buffer[2]) >= 0);
}
int digitvalue (char d) {
if (d>='0' && d<='9') return d-'0';
d = d | 0x20;
if (d>='a' && d<='f') return d-'a'+10;
return 16;
}
char *name (object *obj){
if (obj->type != SYMBOL) error(PSTR("Error in name"));
symbol_t x = obj->name;
if (x < ENDFUNCTIONS) return lookupbuiltin(x);
else if (x >= 64000) return lookupsymbol(x);
char *buffer = SymbolTop;
buffer[3] = '\0';
for (int n=2; n>=0; n--) {
buffer[n] = fromradix40(x % 40);
x = x / 40;
}
return buffer;
}
int integer (object *obj){
if (!integerp(obj)) error2(obj, PSTR("is not an integer"));
return obj->integer;
}
float fromfloat (object *obj){
if (!floatp(obj)) error2(obj, PSTR("is not a float"));
return obj->single_float;
}
float intfloat (object *obj){
if (integerp(obj)) return obj->integer;
if (!floatp(obj)) error2(obj, PSTR("is not an integer or float"));
return obj->single_float;
}
int fromchar (object *obj){
if (!characterp(obj)) error2(obj, PSTR("is not a character"));
return obj->integer;
}
int istream (object *obj){
if (!streamp(obj)) error2(obj, PSTR("is not a stream"));
return obj->integer;
}
int issymbol (object *obj, symbol_t n) {
return symbolp(obj) && obj->name == n;
}
int eq (object *arg1, object *arg2) {
if (arg1 == arg2) return true; // Same object
if ((arg1 == nil) || (arg2 == nil)) return false; // Not both values
if (arg1->cdr != arg2->cdr) return false; // Different values
if (symbolp(arg1) && symbolp(arg2)) return true; // Same symbol
if (integerp(arg1) && integerp(arg2)) return true; // Same integer
if (floatp(arg1) && floatp(arg2)) return true; // Same float
if (characterp(arg1) && characterp(arg2)) return true; // Same character
return false;
}
int listlength (object *list) {
int length = 0;
while (list != NULL) {
list = cdr(list);
length++;
}
return length;
}
// Association lists
object *assoc (object *key, object *list) {
while (list != NULL) {
object *pair = first(list);
if (eq(key,car(pair))) return pair;
list = cdr(list);
}
return nil;
}
object *delassoc (object *key, object **alist) {
object *list = *alist;
object *prev = NULL;
while (list != NULL) {
object *pair = first(list);
if (eq(key,car(pair))) {
if (prev == NULL) *alist = cdr(list);
else cdr(prev) = cdr(list);
return key;
}
prev = list;
list = cdr(list);
}
return nil;
}
// String utilities
void indent (int spaces, pfun_t pfun) {
for (int i=0; i<spaces; i++) pfun(' ');
}
void buildstring (char ch, int *chars, object **head) {
static object* tail;
static uint8_t shift;
if (*chars == 0) {
shift = (sizeof(int)-1)*8;
*chars = ch<<shift;
object *cell = myalloc();
if (*head == NULL) *head = cell; else tail->car = cell;
cell->car = NULL;
cell->integer = *chars;
tail = cell;
} else {
shift = shift - 8;
*chars = *chars | ch<<shift;
tail->integer = *chars;
if (shift == 0) *chars = 0;
}
}
object *readstring (char delim, gfun_t gfun) {
object *obj = myalloc();
obj->type = STRING;
int ch = gfun();
if (ch == -1) return nil;
object *head = NULL;
int chars = 0;
while ((ch != delim) && (ch != -1)) {
if (ch == '\\') ch = gfun();
buildstring(ch, &chars, &head);
ch = gfun();
}
obj->cdr = head;
return obj;
}
int stringlength (object *form) {
int length = 0;
form = cdr(form);
while (form != NULL) {
int chars = form->integer;
for (int i=(sizeof(int)-1)*8; i>=0; i=i-8) {
if (chars>>i & 0xFF) length++;
}
form = car(form);
}
return length;
}
char nthchar (object *string, int n) {
object *arg = cdr(string);
int top;
if (sizeof(int) == 4) { top = n>>2; n = 3 - (n&3); }
else { top = n>>1; n = 1 - (n&1); }
for (int i=0; i<top; i++) {
if (arg == NULL) return 0;
arg = car(arg);
}
if (arg == NULL) return 0;
return (arg->integer)>>(n*8) & 0xFF;
}
// Lookup variable in environment
object *value (symbol_t n, object *env) {
while (env != NULL) {
object *pair = car(env);
if (pair != NULL && car(pair)->name == n) return pair;
env = cdr(env);
}
return nil;
}
object *findvalue (object *var, object *env) {
symbol_t varname = var->name;
object *pair = value(varname, env);
if (pair == NULL) pair = value(varname, GlobalEnv);
if (pair == NULL) error2(var, PSTR("unknown variable"));
return pair;
}
object *findtwin (object *var, object *env) {
while (env != NULL) {
object *pair = car(env);
if (pair != NULL && car(pair) == var) return pair;
env = cdr(env);
}
return NULL;
}
// Handling closures
object *closure (int tc, object *fname, object *state, object *function, object *args, object **env) {
int trace = 0;
if (fname != NULL) trace = tracing(fname->name);
if (trace) {
indent(TraceDepth[trace-1]<<1, pserial);
pint(TraceDepth[trace-1]++, pserial);
pserial(':'); pserial(' '); pserial('('); printobject(fname, pserial);
}
object *params = first(function);
function = cdr(function);
// Push state if not already in env
while (state != NULL) {
object *pair = first(state);
if (findtwin(car(pair), *env) == NULL) push(pair, *env);
state = cdr(state);
}
// Add arguments to environment
while (params != NULL && args != NULL) {
object *value;
object *var = first(params);
if (var->name == AMPREST) {
params = cdr(params);
var = first(params);
value = args;
args = NULL;
} else {
value = first(args);
args = cdr(args);
}
object *pair = findtwin(var, *env);
if (tc && (pair != NULL)) cdr(pair) = value;
else push(cons(var,value), *env);
params = cdr(params);
if (trace) { pserial(' '); printobject(value, pserial); }
}
if (params != NULL) error2(fname, PSTR("has too few parameters"));
if (args != NULL) error2(fname, PSTR("has too many parameters"));
if (trace) { pserial(')'); pln(pserial); }
// Do an implicit progn
return tf_progn(function, *env);
}
object *apply (object *function, object *args, object **env) {
if (symbolp(function)) {
symbol_t name = function->name;
int nargs = listlength(args);
if (name >= ENDFUNCTIONS) error2(function, PSTR("is not valid here"));
if (nargs<lookupmin(name)) error2(function, PSTR("has too few arguments"));
if (nargs>lookupmax(name)) error2(function, PSTR("has too many arguments"));
return ((fn_ptr_type)lookupfn(name))(args, *env);
}
if (listp(function) && issymbol(car(function), LAMBDA)) {
function = cdr(function);
object *result = closure(0, NULL, NULL, function, args, env);
return eval(result, *env);
}
if (listp(function) && issymbol(car(function), CLOSURE)) {
function = cdr(function);
object *result = closure(0, NULL, car(function), cdr(function), args, env);
return eval(result, *env);
}
error2(function, PSTR("is an illegal function"));
return NULL;
}
// In-place operations
object **place (object *args, object *env) {
if (atom(args)) return &cdr(findvalue(args, env));
object* function = first(args);
if (issymbol(function, CAR) || issymbol(function, FIRST)) {
object *value = eval(second(args), env);
if (!listp(value)) error(PSTR("Can't take car"));
return &car(value);
}
if (issymbol(function, CDR) || issymbol(function, REST)) {
object *value = eval(second(args), env);
if (!listp(value)) error(PSTR("Can't take cdr"));
return &cdr(value);
}
if (issymbol(function, NTH)) {
int index = integer(eval(second(args), env));
object *list = eval(third(args), env);
if (atom(list)) error(PSTR("'nth' second argument is not a list"));
while (index > 0) {
list = cdr(list);
if (list == NULL) error(PSTR("'nth' index out of range"));
index--;
}
return &car(list);
}
error(PSTR("Illegal place"));
return nil;
}
// Checked car and cdr
inline object *carx (object *arg) {
if (!listp(arg)) error(PSTR("Can't take car"));
if (arg == nil) return nil;
return car(arg);
}
inline object *cdrx (object *arg) {
if (!listp(arg)) error(PSTR("Can't take cdr"));
if (arg == nil) return nil;
return cdr(arg);
}
// I2C interface
void I2Cinit(bool enablePullup) {
(void) enablePullup;
Wire.begin();
}
inline uint8_t I2Cread() {
return Wire.read();
}
inline bool I2Cwrite(uint8_t data) {
return Wire.write(data);
}
bool I2Cstart(uint8_t address, uint8_t read) {
if (read == 0) Wire.beginTransmission(address);
else Wire.requestFrom(address, I2CCount);
return true;
}
bool I2Crestart(uint8_t address, uint8_t read) {
int error = (Wire.endTransmission(true) != 0);
if (read == 0) Wire.beginTransmission(address);
else Wire.requestFrom(address, I2CCount);
return error ? false : true;
}
void I2Cstop(uint8_t read) {
if (read == 0) Wire.endTransmission(); // Check for error?
}
// Streams
inline int spiread () { return SPI.transfer(0); }
#if defined(ARDUINO_SAMD_ZERO) || defined(ARDUINO_SAMD_MKRZERO) || defined(ARDUINO_METRO_M4) || defined(ARDUINO_ITSYBITSY_M4) || defined(ARDUINO_FEATHER_M4)
inline int serial1read () { while (!Serial1.available()) testescape(); return Serial1.read(); }
#elif defined(ARDUINO_SAM_DUE)
inline int serial1read () { while (!Serial1.available()) testescape(); return Serial1.read(); }
inline int serial2read () { while (!Serial2.available()) testescape(); return Serial2.read(); }
inline int serial3read () { while (!Serial3.available()) testescape(); return Serial3.read(); }
#endif
#if defined(sdcardsupport)
File SDpfile, SDgfile;
inline int SDread () {
if (LastChar) {
char temp = LastChar;
LastChar = 0;
return temp;
}
return SDgfile.read();
}
#endif
void serialbegin (int address, int baud) {
#if defined(ARDUINO_SAMD_ZERO) || defined(ARDUINO_SAMD_MKRZERO) || defined(ARDUINO_METRO_M4) || defined(ARDUINO_ITSYBITSY_M4) || defined(ARDUINO_FEATHER_M4)
if (address == 1) Serial1.begin((long)baud*100);
else error(PSTR("'with-serial' port not supported"));
#elif defined(ARDUINO_SAM_DUE)
if (address == 1) Serial1.begin((long)baud*100);
else if (address == 2) Serial2.begin((long)baud*100);
else if (address == 3) Serial3.begin((long)baud*100);
else error(PSTR("'with-serial' port not supported"));
#endif
}
void serialend (int address) {
#if defined(ARDUINO_SAMD_ZERO) || defined(ARDUINO_SAMD_MKRZERO) || defined(ARDUINO_METRO_M4) || defined(ARDUINO_ITSYBITSY_M4) || defined(ARDUINO_FEATHER_M4)
if (address == 1) {Serial1.flush(); Serial1.end(); }
#elif defined(ARDUINO_SAM_DUE)
if (address == 1) {Serial1.flush(); Serial1.end(); }
else if (address == 2) {Serial2.flush(); Serial2.end(); }
else if (address == 3) {Serial3.flush(); Serial3.end(); }
#endif
}
gfun_t gstreamfun (object *args) {
int streamtype = SERIALSTREAM;
int address = 0;
gfun_t gfun = gserial;
if (args != NULL) {
int stream = istream(first(args));
streamtype = stream>>8; address = stream & 0xFF;
}
if (streamtype == I2CSTREAM) gfun = (gfun_t)I2Cread;
else if (streamtype == SPISTREAM) gfun = spiread;
else if (streamtype == SERIALSTREAM) {
if (address == 0) gfun = gserial;
#if !defined(_VARIANT_BBC_MICROBIT_)
else if (address == 1) gfun = serial1read;
#endif
}
#if defined(sdcardsupport)
else if (streamtype == SDSTREAM) gfun = (gfun_t)SDread;
#endif
else error(PSTR("Unknown stream type"));
return gfun;
}
inline void spiwrite (char c) { SPI.transfer(c); }
#if !defined(_VARIANT_BBC_MICROBIT_)
inline void serial1write (char c) { Serial1.write(c); }
#endif
#if defined(sdcardsupport)
inline void SDwrite (char c) { SDpfile.write(c); }
#endif
pfun_t pstreamfun (object *args) {
int streamtype = SERIALSTREAM;
int address = 0;
pfun_t pfun = pserial;
if (args != NULL && first(args) != NULL) {
int stream = istream(first(args));
streamtype = stream>>8; address = stream & 0xFF;
}
if (streamtype == I2CSTREAM) pfun = (pfun_t)I2Cwrite;
else if (streamtype == SPISTREAM) pfun = spiwrite;
else if (streamtype == SERIALSTREAM) {
if (address == 0) pfun = pserial;
#if !defined(_VARIANT_BBC_MICROBIT_)
else if (address == 1) pfun = serial1write;
#endif
}
#if defined(sdcardsupport)
else if (streamtype == SDSTREAM) pfun = (pfun_t)SDwrite;
#endif
else error(PSTR("unknown stream type"));
return pfun;
}
// Check pins
void checkanalogread (int pin) {
#if defined(ARDUINO_SAM_DUE)
if (!(pin>=54 && pin<=65)) error(PSTR("'analogread' invalid pin"));
#elif defined(ARDUINO_SAMD_ZERO)
if (!(pin>=14 && pin<=19)) error(PSTR("'analogread' invalid pin"));
#elif defined(ARDUINO_SAMD_MKRZERO)
if (!(pin>=15 && pin<=21)) error(PSTR("'analogread' invalid pin"));
#elif defined(ARDUINO_METRO_M4)
if (!(pin>=14 && pin<=21)) error(PSTR("'analogread' invalid pin"));
#elif defined(ARDUINO_ITSYBITSY_M4)
if (!(pin>=14 && pin<=19)) error(PSTR("'analogread' invalid pin"));
#elif defined(ARDUINO_FEATHER_M4)
if (!(pin>=14 && pin<=19)) error(PSTR("'analogread' invalid pin"));
#elif defined(_VARIANT_BBC_MICROBIT_)
if (!((pin>=0 && pin<=4) || pin==10)) error(PSTR("'analogread' invalid pin"));
#endif
}
void checkanalogwrite (int pin) {
#if defined(ARDUINO_SAM_DUE)
if (!((pin>=2 && pin<=13) || pin==66 || pin==67)) error(PSTR("'analogwrite' invalid pin"));
#elif defined(ARDUINO_SAMD_ZERO)
if (!((pin>=3 && pin<=6) || (pin>=8 && pin<=13) || pin==14)) error(PSTR("'analogwrite' invalid pin"));
#elif defined(ARDUINO_SAMD_MKRZERO)
if (!((pin>=0 && pin<=8) || pin==10 || pin==18 || pin==19)) error(PSTR("'analogwrite' invalid pin"));
#elif defined(ARDUINO_METRO_M4)
if (!(pin>=0 && pin<=15)) error(PSTR("'analogwrite' invalid pin"));
#elif defined(ARDUINO_ITSYBITSY_M4)
if (!(pin==0 || pin==1 || pin==4 || pin==5 || pin==7 || (pin>=9 && pin<=15) || pin==21 || pin==22)) error(PSTR("'analogwrite' invalid pin"));
#elif defined(ARDUINO_FEATHER_M4)
if (!(pin==0 || pin==1 || (pin>=4 && pin<=6) || (pin>=9 && pin<=13) || pin==14 || pin==15 || pin==17 || pin==21 || pin==22)) error(PSTR("'analogwrite' invalid pin"));
#elif defined(_VARIANT_BBC_MICROBIT_)
if (!(pin>=0 && pin<=2)) error(PSTR("'analogwrite' invalid pin"));
#endif
}
// Note
void tone (int pin, int note) {
(void) pin, (void) note;
}
void noTone (int pin) {
(void) pin;
}
const int scale[] PROGMEM = {4186,4435,4699,4978,5274,5588,5920,6272,6645,7040,7459,7902};
void playnote (int pin, int note, int octave) {
int prescaler = 8 - octave - note/12;
if (prescaler<0 || prescaler>8) error(PSTR("'note' octave out of range"));
tone(pin, scale[note%12]>>prescaler);
}
void nonote (int pin) {
noTone(pin);
}
// Sleep
#if defined(ARDUINO_SAMD_ZERO) || defined(ARDUINO_SAMD_MKRZERO)
void WDT_Handler(void) {
// ISR for watchdog early warning
WDT->CTRL.bit.ENABLE = 0; // Disable watchdog
while(WDT->STATUS.bit.SYNCBUSY); // Sync CTRL write
WDT->INTFLAG.bit.EW = 1; // Clear interrupt flag
}
#endif
void initsleep () {
#if defined(ARDUINO_SAMD_ZERO) || defined(ARDUINO_SAMD_MKRZERO)
// One-time initialization of watchdog timer.
// Generic clock generator 2, divisor = 32 (2^(DIV+1))
GCLK->GENDIV.reg = GCLK_GENDIV_ID(2) | GCLK_GENDIV_DIV(4);
// Enable clock generator 2 using low-power 32KHz oscillator.
// With /32 divisor above, this yields 1024Hz clock.
GCLK->GENCTRL.reg = GCLK_GENCTRL_ID(2) |
GCLK_GENCTRL_GENEN |
GCLK_GENCTRL_SRC_OSCULP32K |
GCLK_GENCTRL_DIVSEL;
while(GCLK->STATUS.bit.SYNCBUSY);
// WDT clock = clock gen 2
GCLK->CLKCTRL.reg = GCLK_CLKCTRL_ID_WDT |
GCLK_CLKCTRL_CLKEN |
GCLK_CLKCTRL_GEN_GCLK2;
// Enable WDT early-warning interrupt
NVIC_DisableIRQ(WDT_IRQn);
NVIC_ClearPendingIRQ(WDT_IRQn);
NVIC_SetPriority(WDT_IRQn, 0); // Top priority
NVIC_EnableIRQ(WDT_IRQn);
#endif
}
void sleep (int secs) {
#if defined(ARDUINO_SAMD_ZERO) || defined(ARDUINO_SAMD_MKRZERO)
WDT->CTRL.reg = 0; // Disable watchdog for config
while(WDT->STATUS.bit.SYNCBUSY);
WDT->INTENSET.bit.EW = 1; // Enable early warning interrupt
WDT->CONFIG.bit.PER = 0xB; // Period = max
WDT->CONFIG.bit.WINDOW = 0x7; // Set time of interrupt = 1024 cycles = 1 sec
WDT->CTRL.bit.WEN = 1; // Enable window mode
while(WDT->STATUS.bit.SYNCBUSY); // Sync CTRL write
SysTick->CTRL = 0; // Stop SysTick interrupts
while (secs > 0) {
WDT->CLEAR.reg = WDT_CLEAR_CLEAR_KEY;// Clear watchdog interval
while(WDT->STATUS.bit.SYNCBUSY);
WDT->CTRL.bit.ENABLE = 1; // Start watchdog now!
while(WDT->STATUS.bit.SYNCBUSY);
SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk; // Deepest sleep
__DSB();
__WFI(); // Wait for interrupt
secs--;
}
SysTick->CTRL = 7; // Restart SysTick interrupts
#else
delay(1000*secs);
#endif
}
// Special forms
object *sp_quote (object *args, object *env) {
(void) env;
return first(args);
}
object *sp_defun (object *args, object *env) {
(void) env;
object *var = first(args);
if (var->type != SYMBOL) error2(var, PSTR("is not a symbol"));
object *val = cons(symbol(LAMBDA), cdr(args));
object *pair = value(var->name,GlobalEnv);
if (pair != NULL) { cdr(pair) = val; return var; }
push(cons(var, val), GlobalEnv);
return var;
}
object *sp_defvar (object *args, object *env) {
object *var = first(args);
if (var->type != SYMBOL) error2(var, PSTR("is not a symbol"));
object *val = NULL;
args = cdr(args);
if (args != NULL) val = eval(first(args), env);
object *pair = value(var->name,GlobalEnv);
if (pair != NULL) { cdr(pair) = val; return var; }
push(cons(var, val), GlobalEnv);
return var;
}
object *sp_setq (object *args, object *env) {
object *arg = eval(second(args), env);
object *pair = findvalue(first(args), env);
cdr(pair) = arg;
return arg;
}
object *sp_loop (object *args, object *env) {
clrflag(RETURNFLAG);
object *start = args;
for (;;) {
args = start;
while (args != NULL) {
object *result = eval(car(args),env);
if (tstflag(RETURNFLAG)) {
clrflag(RETURNFLAG);
return result;
}
args = cdr(args);
}
}
}
object *sp_push (object *args, object *env) {
object *item = eval(first(args), env);
object **loc = place(second(args), env);
push(item, *loc);
return *loc;
}
object *sp_pop (object *args, object *env) {
object **loc = place(first(args), env);
object *result = car(*loc);
pop(*loc);
return result;
}
// Special forms incf/decf
object *sp_incf (object *args, object *env) {
object **loc = place(first(args), env);
args = cdr(args);
object *x = *loc;
object *inc = (args != NULL) ? eval(first(args), env) : NULL;
if (floatp(x) || floatp(inc)) {
float increment;
float value = intfloat(x);
if (inc == NULL) increment = 1.0;
else increment = intfloat(inc);
*loc = makefloat(value + increment);
} else {
int increment;
int value = integer(x);
if (inc == NULL) increment = 1;
else increment = integer(inc);
if (increment < 1) {
if (INT_MIN - increment > value) *loc = makefloat((float)value + (float)increment);
else *loc = number(value + increment);
} else {
if (INT_MAX - increment < value) *loc = makefloat((float)value + (float)increment);
else *loc = number(value + increment);
}
}
return *loc;
}
object *sp_decf (object *args, object *env) {
object **loc = place(first(args), env);
args = cdr(args);
object *x = *loc;
object *dec = (args != NULL) ? eval(first(args), env) : NULL;
if (floatp(x) || floatp(dec)) {
float decrement;
float value = intfloat(x);
if (dec == NULL) decrement = 1.0;
else decrement = intfloat(dec);
*loc = makefloat(value - decrement);
} else {
int decrement;
int value = integer(x);
if (dec == NULL) decrement = 1;
else decrement = integer(dec);
if (decrement < 1) {
if (INT_MAX + decrement < value) *loc = makefloat((float)value - (float)decrement);
else *loc = number(value - decrement);
} else {
if (INT_MIN + decrement > value) *loc = makefloat((float)value - (float)decrement);
else *loc = number(value - decrement);
}
}
return *loc;
}
object *sp_setf (object *args, object *env) {
object **loc = place(first(args), env);
object *result = eval(second(args), env);
*loc = result;
return result;
}
object *sp_dolist (object *args, object *env) {
object *params = first(args);
object *var = first(params);
object *result;
object *list = eval(second(params), env);
if (!listp(list)) error(PSTR("'dolist' argument is not a list"));
push(list, GCStack); // Don't GC the list
object *pair = cons(var,nil);
push(pair,env);
params = cdr(cdr(params));
object *forms = cdr(args);
while (list != NULL) {
cdr(pair) = first(list);
list = cdr(list);
result = eval(tf_progn(forms,env), env);
if (tstflag(RETURNFLAG)) {
clrflag(RETURNFLAG);
return result;
}
}
cdr(pair) = nil;
pop(GCStack);
if (params == NULL) return nil;
return eval(car(params), env);
}
object *sp_dotimes (object *args, object *env) {
object *params = first(args);
object *var = first(params);
object *result;
int count = integer(eval(second(params), env));
int index = 0;
params = cdr(cdr(params));
object *pair = cons(var,number(0));
push(pair,env);
object *forms = cdr(args);
while (index < count) {
cdr(pair) = number(index);
index++;
result = eval(tf_progn(forms,env), env);
if (tstflag(RETURNFLAG)) {
clrflag(RETURNFLAG);
return result;
}
}
cdr(pair) = number(index);
if (params == NULL) return nil;
return eval(car(params), env);
}
object *sp_trace (object *args, object *env) {
(void) env;
while (args != NULL) {
trace(first(args)->name);
args = cdr(args);
}
int i = 0;
while (i < TRACEMAX) {
if (TraceFn[i] != 0) args = cons(symbol(TraceFn[i]), args);
i++;
}
return args;
}
object *sp_untrace (object *args, object *env) {
(void) env;
if (args == NULL) {
int i = 0;
while (i < TRACEMAX) {
if (TraceFn[i] != 0) args = cons(symbol(TraceFn[i]), args);
TraceFn[i] = 0;
i++;
}
} else {
while (args != NULL) {
untrace(first(args)->name);
args = cdr(args);
}
}
return args;
}
object *sp_formillis (object *args, object *env) {
object *param = first(args);
unsigned long start = millis();
unsigned long now, total = 0;
if (param != NULL) total = integer(first(param));
eval(tf_progn(cdr(args),env), env);
do {
now = millis() - start;
testescape();
} while (now < total);
if (now <= INT_MAX) return number(now);
return nil;
}
object *sp_withserial (object *args, object *env) {
object *params = first(args);
object *var = first(params);
int address = integer(eval(second(params), env));
params = cddr(params);
int baud = 96;
if (params != NULL) baud = integer(eval(first(params), env));
object *pair = cons(var, stream(SERIALSTREAM, address));
push(pair,env);
serialbegin(address, baud);
object *forms = cdr(args);
object *result = eval(tf_progn(forms,env), env);
serialend(address);
return result;
}
object *sp_withi2c (object *args, object *env) {
object *params = first(args);
object *var = first(params);
int address = integer(eval(second(params), env));
params = cddr(params);
int read = 0; // Write
I2CCount = 0;
if (params != NULL) {
object *rw = eval(first(params), env);
if (integerp(rw)) I2CCount = integer(rw);
read = (rw != NULL);
}
I2Cinit(1); // Pullups
object *pair = cons(var, (I2Cstart(address, read)) ? stream(I2CSTREAM, address) : nil);
push(pair,env);
object *forms = cdr(args);
object *result = eval(tf_progn(forms,env), env);
I2Cstop(read);
return result;
}
object *sp_withspi (object *args, object *env) {
object *params = first(args);
object *var = first(params);
int pin = integer(eval(second(params), env));
int divider = 0, mode = 0, bitorder = 1;
object *pair = cons(var, stream(SPISTREAM, pin));
push(pair,env);
SPI.begin();
params = cddr(params);
if (params != NULL) {
int d = integer(eval(first(params), env));
if (d<1 || d>7) error(PSTR("'with-spi' invalid divider"));
if (d == 7) divider = 3;
else if (d & 1) divider = (d>>1) + 4;
else divider = (d>>1) - 1;
params = cdr(params);
if (params != NULL) {
bitorder = (eval(first(params), env) == NULL);
params = cdr(params);
if (params != NULL) mode = integer(eval(first(params), env));
}
}
pinMode(pin, OUTPUT);
digitalWrite(pin, LOW);
SPI.setBitOrder((BitOrder)bitorder);
SPI.setClockDivider(divider);
SPI.setDataMode(mode);
object *forms = cdr(args);
object *result = eval(tf_progn(forms,env), env);
digitalWrite(pin, HIGH);
SPI.end();
return result;
}
object *sp_withsdcard (object *args, object *env) {
#if defined(sdcardsupport)
object *params = first(args);
object *var = first(params);
object *filename = eval(second(params), env);
params = cddr(params);
SD.begin(SDCARD_SS_PIN);
int mode = 0;
if (params != NULL && first(params) != NULL) mode = integer(first(params));
int oflag = O_READ;
if (mode == 1) oflag = O_RDWR | O_CREAT | O_APPEND; else if (mode == 2) oflag = O_RDWR | O_CREAT | O_TRUNC;
if (mode >= 1) {
SDpfile = SD.open(MakeFilename(filename), oflag);
if (!SDpfile) error(PSTR("Problem writing to SD card"));
} else {
SDgfile = SD.open(MakeFilename(filename), oflag);
if (!SDgfile) error(PSTR("Problem reading from SD card"));
}
object *pair = cons(var, stream(SDSTREAM, 1));
push(pair,env);
object *forms = cdr(args);
object *result = eval(tf_progn(forms,env), env);
if (mode >= 1) SDpfile.close(); else SDgfile.close();
return result;
#else
(void) args, (void) env;
error(PSTR("with-sd-card not supported"));
return nil;
#endif
}
// Tail-recursive forms
object *tf_progn (object *args, object *env) {
if (args == NULL) return nil;
object *more = cdr(args);
while (more != NULL) {
object *result = eval(car(args),env);
if (tstflag(RETURNFLAG)) return result;
args = more;
more = cdr(args);
}
return car(args);
}
object *tf_return (object *args, object *env) {
setflag(RETURNFLAG);
return tf_progn(args, env);
}
object *tf_if (object *args, object *env) {
if (args == NULL || cdr(args) == NULL) error(PSTR("'if' missing argument(s)"));
if (eval(first(args), env) != nil) return second(args);
args = cddr(args);
return (args != NULL) ? first(args) : nil;
}
object *tf_cond (object *args, object *env) {
while (args != NULL) {
object *clause = first(args);
if (!consp(clause)) error2(clause, PSTR("is an illegal clause"));
object *test = eval(first(clause), env);
object *forms = cdr(clause);
if (test != nil) {
if (forms == NULL) return test; else return tf_progn(forms, env);
}
args = cdr(args);
}
return nil;
}
object *tf_when (object *args, object *env) {
if (args == NULL) error(PSTR("'when' missing argument"));
if (eval(first(args), env) != nil) return tf_progn(cdr(args),env);
else return nil;
}
object *tf_unless (object *args, object *env) {
if (args == NULL) error(PSTR("'unless' missing argument"));
if (eval(first(args), env) != nil) return nil;
else return tf_progn(cdr(args),env);
}
object *tf_and (object *args, object *env) {
if (args == NULL) return tee;
object *more = cdr(args);
while (more != NULL) {
if (eval(car(args), env) == NULL) return nil;
args = more;
more = cdr(args);
}
return car(args);
}
object *tf_or (object *args, object *env) {
object *more = cdr(args);
while (more != NULL) {
object *result = eval(car(args), env);
if (result != NULL) return result;
args = more;
more = cdr(args);
}
return car(args);
}
// Core functions
object *fn_not (object *args, object *env) {
(void) env;
return (first(args) == nil) ? tee : nil;
}
object *fn_cons (object *args, object *env) {
(void) env;
return cons(first(args),second(args));
}
object *fn_atom (object *args, object *env) {
(void) env;
return atom(first(args)) ? tee : nil;
}
object *fn_listp (object *args, object *env) {
(void) env;
return listp(first(args)) ? tee : nil;
}
object *fn_consp (object *args, object *env) {
(void) env;
return consp(first(args)) ? tee : nil;
}
object *fn_symbolp (object *args, object *env) {
(void) env;
object *arg = first(args);
return symbolp(arg) ? tee : nil;
}
object *fn_streamp (object *args, object *env) {
(void) env;
object *arg = first(args);
return streamp(arg) ? tee : nil;
}
object *fn_eq (object *args, object *env) {
(void) env;
return eq(first(args), second(args)) ? tee : nil;
}
// List functions
object *fn_car (object *args, object *env) {
(void) env;
return carx(first(args));
}
object *fn_cdr (object *args, object *env) {
(void) env;
return cdrx(first(args));
}
object *fn_caar (object *args, object *env) {
(void) env;
return carx(carx(first(args)));
}
object *fn_cadr (object *args, object *env) {
(void) env;
return carx(cdrx(first(args)));
}
object *fn_cdar (object *args, object *env) {
(void) env;
return cdrx(carx(first(args)));
}
object *fn_cddr (object *args, object *env) {
(void) env;
return cdrx(cdrx(first(args)));
}
object *fn_caaar (object *args, object *env) {
(void) env;
return carx(carx(carx(first(args))));
}
object *fn_caadr (object *args, object *env) {
(void) env;
return carx(carx(cdrx(first(args))));
}
object *fn_cadar (object *args, object *env) {
(void) env;
return carx(cdrx(carx(first(args))));
}
object *fn_caddr (object *args, object *env) {
(void) env;
return carx(cdrx(cdrx(first(args))));
}
object *fn_cdaar (object *args, object *env) {
(void) env;
return cdrx(carx(carx(first(args))));
}
object *fn_cdadr (object *args, object *env) {
(void) env;
return cdrx(carx(cdrx(first(args))));
}
object *fn_cddar (object *args, object *env) {
(void) env;
return cdrx(cdrx(carx(first(args))));
}
object *fn_cdddr (object *args, object *env) {
(void) env;
return cdrx(cdrx(cdrx(first(args))));
}
object *fn_length (object *args, object *env) {
(void) env;
object *arg = first(args);
if (listp(arg)) return number(listlength(arg));
if (!stringp(arg)) error(PSTR("'length' argument is not a list or string"));
return number(stringlength(arg));
}
object *fn_list (object *args, object *env) {
(void) env;
return args;
}
object *fn_reverse (object *args, object *env) {
(void) env;
object *list = first(args);
if (!listp(list)) error(PSTR("'reverse' argument is not a list"));
object *result = NULL;
while (list != NULL) {
push(first(list),result);
list = cdr(list);
}
return result;
}
object *fn_nth (object *args, object *env) {
(void) env;
int n = integer(first(args));
object *list = second(args);
if (!listp(list)) error(PSTR("'nth' second argument is not a list"));
while (list != NULL) {
if (n == 0) return car(list);
list = cdr(list);
n--;
}
return nil;
}
object *fn_assoc (object *args, object *env) {
(void) env;
object *key = first(args);
object *list = second(args);
if (!listp(list)) error(PSTR("'assoc' second argument is not a list"));
return assoc(key,list);
}
object *fn_member (object *args, object *env) {
(void) env;
object *item = first(args);
object *list = second(args);
if (!listp(list)) error(PSTR("'member' second argument is not a list"));
while (list != NULL) {
if (eq(item,car(list))) return list;
list = cdr(list);
}
return nil;
}
object *fn_apply (object *args, object *env) {
object *previous = NULL;
object *last = args;
while (cdr(last) != NULL) {
previous = last;
last = cdr(last);
}
if (!listp(car(last))) error(PSTR("'apply' last argument is not a list"));
cdr(previous) = car(last);
return apply(first(args), cdr(args), &env);
}
object *fn_funcall (object *args, object *env) {
return apply(first(args), cdr(args), &env);
}
object *fn_append (object *args, object *env) {
(void) env;
object *head = NULL;
object *tail = NULL;
while (args != NULL) {
object *list = first(args);
if (!listp(list)) error(PSTR("'append' argument is not a list"));
while (list != NULL) {
object *obj = cons(first(list),NULL);
if (head == NULL) {
head = obj;
tail = obj;
} else {
cdr(tail) = obj;
tail = obj;
}
list = cdr(list);
}
args = cdr(args);
}
return head;
}
object *fn_mapc (object *args, object *env) {
object *function = first(args);
object *list1 = second(args);
object *result = list1;
if (!listp(list1)) error(PSTR("'mapc' second argument is not a list"));
object *list2 = cddr(args);
if (list2 != NULL) {
list2 = car(list2);
if (!listp(list2)) error(PSTR("'mapc' third argument is not a list"));
while (list1 != NULL && list2 != NULL) {
apply(function, cons(car(list1),cons(car(list2),NULL)), &env);
list1 = cdr(list1);
list2 = cdr(list2);
}
} else {
while (list1 != NULL) {
apply(function, cons(car(list1),NULL), &env);
list1 = cdr(list1);
}
}
return result;
}
object *fn_mapcar (object *args, object *env) {
object *function = first(args);
object *list1 = second(args);
if (!listp(list1)) error(PSTR("'mapcar' second argument is not a list"));
object *list2 = cddr(args);
if (list2 != NULL) {
list2 = car(list2);
if (!listp(list2)) error(PSTR("'mapcar' third argument is not a list"));
}
object *head = NULL;
object *tail = NULL;
if (list2 != NULL) {
while (list1 != NULL && list2 != NULL) {
object *result = apply(function, cons(car(list1),cons(car(list2),NULL)), &env);
object *obj = cons(result,NULL);
if (head == NULL) {
head = obj;
push(head,GCStack);
tail = obj;
} else {
cdr(tail) = obj;
tail = obj;
}
list1 = cdr(list1);
list2 = cdr(list2);
}
pop(GCStack);
} else if (list1 != NULL) {
while (list1 != NULL) {
object *result = apply(function, cons(car(list1),NULL), &env);
object *obj = cons(result,NULL);
if (head == NULL) {
head = obj;
push(head,GCStack);
tail = obj;
} else {
cdr(tail) = obj;
tail = obj;
}
list1 = cdr(list1);
}
pop(GCStack);
}
return head;
}
// Arithmetic functions
object *add_floats (object *args, float fresult) {
while (args != NULL) {
object *arg = car(args);
fresult = fresult + intfloat(arg);
args = cdr(args);
}
return makefloat(fresult);
}
object *fn_add (object *args, object *env) {
(void) env;
int result = 0;
while (args != NULL) {
object *arg = car(args);
if (floatp(arg)) return add_floats(args, (float)result);
int val = integer(arg);
if (val < 1) { if (INT_MIN - val > result) return add_floats(args, (float)result); }
else { if (INT_MAX - val < result) return add_floats(args, (float)result); }
result = result + val;
args = cdr(args);
}
return number(result);
}
object *subtract_floats (object *args, float fresult) {
while (args != NULL) {
object *arg = car(args);
fresult = fresult - intfloat(arg);
args = cdr(args);
}
return makefloat(fresult);
}
object *negate (object *arg) {
if (integerp(arg)) {
int result = integer(arg);
if (result == INT_MIN) return makefloat(-fromfloat(arg));
else return number(-result);
} else return makefloat(-fromfloat(arg));
}
object *fn_subtract (object *args, object *env) {
(void) env;
object *arg = car(args);
args = cdr(args);
if (args == NULL) return negate(arg);
else if (floatp(arg)) return subtract_floats(args, fromfloat(arg));
else {
int result = integer(arg);
while (args != NULL) {
arg = car(args);
if (floatp(arg)) return subtract_floats(args, result);
int val = integer(car(args));
if (val < 1) { if (INT_MAX + val < result) return subtract_floats(args, result); }
else { if (INT_MIN + val > result) return subtract_floats(args, result); }
result = result - val;
args = cdr(args);
}
return number(result);
}
}
object *multiply_floats(object *args, float fresult) {
while (args != NULL) {
object *arg = car(args);
fresult = fresult * intfloat(arg);
args = cdr(args);
}
return makefloat(fresult);
}
object *fn_multiply (object *args, object *env) {
(void) env;
int result = 1;
while (args != NULL){
object *arg = car(args);
if (floatp(arg)) return multiply_floats(args, result);
int64_t val = result * (int64_t)integer(arg);
if ((val > INT_MAX) || (val < INT_MIN)) return multiply_floats(args, result);
result = val;
args = cdr(args);
}
return number(result);
}
object *divide_floats (object *args, float fresult) {
while (args != NULL) {
object *arg = car(args);
float f = intfloat(arg);
if (f == 0.0) error(PSTR("Division by zero"));
fresult = fresult / f;
args = cdr(args);
}
return makefloat(fresult);
}
object *fn_divide (object *args, object *env) {
(void) env;
object* arg = first(args);
args = cdr(args);
// One argument
if (args == NULL) {
if (floatp(arg)) {
float f = fromfloat(arg);
if (f == 0.0) error(PSTR("Division by zero"));
return makefloat(1.0 / f);
} else {
int i = integer(arg);
if (i == 0) error(PSTR("Division by zero"));
else if (i == 1) return number(1);
else return makefloat(1.0 / i);
}
}
// Multiple arguments
if (floatp(arg)) return divide_floats(args, fromfloat(arg));
else {
int result = integer(arg);
while (args != NULL) {
arg = car(args);
if (floatp(arg)) {
return divide_floats(args, result);
} else {
int i = integer(arg);
if (i == 0) error(PSTR("Division by zero"));
if ((result % i) != 0) return divide_floats(args, result);
if ((result == INT_MIN) && (i == -1)) return divide_floats(args, result);
result = result / i;
args = cdr(args);
}
}
return number(result);
}
}
object *fn_mod (object *args, object *env) {
(void) env;
object *arg1 = first(args);
object *arg2 = second(args);
if (integerp(arg1) && integerp(arg2)) {
int divisor = integer(arg2);
if (divisor == 0) error(PSTR("Division by zero"));
int dividend = integer(arg1);
int remainder = dividend % divisor;
if ((dividend<0) != (divisor<0)) remainder = remainder + divisor;
return number(remainder);
} else {
float fdivisor = intfloat(arg2);
if (fdivisor == 0.0) error(PSTR("Division by zero"));
float fdividend = intfloat(arg1);
float fremainder = fmod(fdividend , fdivisor);
if ((fdividend<0) != (fdivisor<0)) fremainder = fremainder + fdivisor;
return makefloat(fremainder);
}
}
object *fn_oneplus (object *args, object *env) {
(void) env;
object* arg = first(args);
if (floatp(arg)) return makefloat(fromfloat(arg) + 1.0);
else {
int result = integer(arg);
if (result == INT_MAX) return makefloat(integer(arg) + 1.0);
else return number(result + 1);
}
}
object *fn_oneminus (object *args, object *env) {
(void) env;
object* arg = first(args);
if (floatp(arg)) return makefloat(fromfloat(arg) - 1.0);
else {
int result = integer(arg);
if (result == INT_MIN) return makefloat(integer(arg) - 1.0);
else return number(result - 1);
}
}
object *fn_abs (object *args, object *env) {
(void) env;
object *arg = first(args);
if (floatp(arg)) return makefloat(abs(fromfloat(arg)));
else {
int result = integer(arg);
if (result == INT_MIN) return makefloat(abs((float)integer(arg)));
else return number(abs(result));
}
}
object *fn_random (object *args, object *env) {
(void) env;
object *arg = first(args);
if (integerp(arg)) return number(random(integer(arg)));
else return makefloat((float)rand()/(float)(RAND_MAX/fromfloat(arg)));
}
object *fn_maxfn (object *args, object *env) {
(void) env;
object* result = first(args);
args = cdr(args);
while (args != NULL) {
object *arg = car(args);
if (integerp(result) && integerp(arg)) {
if ((integer(arg) > integer(result))) result = arg;
} else if ((intfloat(arg) > intfloat(result))) result = arg;
args = cdr(args);
}
return result;
}
object *fn_minfn (object *args, object *env) {
(void) env;
object* result = first(args);
args = cdr(args);
while (args != NULL) {
object *arg = car(args);
if (integerp(result) && integerp(arg)) {
if ((integer(arg) < integer(result))) result = arg;
} else if ((intfloat(arg) < intfloat(result))) result = arg;
args = cdr(args);
}
return result;
}
// Arithmetic comparisons
object *fn_noteq (object *args, object *env) {
(void) env;
while (args != NULL) {
object *nargs = args;
object *arg1 = first(nargs);
nargs = cdr(nargs);
while (nargs != NULL) {
object *arg2 = first(nargs);
if (integerp(arg1) && integerp(arg2)) {
if ((integer(arg1) == integer(arg2))) return nil;
} else if ((intfloat(arg1) == intfloat(arg2))) return nil;
nargs = cdr(nargs);
}
args = cdr(args);
}
return tee;
}
object *fn_numeq (object *args, object *env) {
(void) env;
object *arg1 = first(args);
args = cdr(args);
while (args != NULL) {
object *arg2 = first(args);
if (integerp(arg1) && integerp(arg2)) {
if (!(integer(arg1) == integer(arg2))) return nil;
} else if (!(intfloat(arg1) == intfloat(arg2))) return nil;
arg1 = arg2;
args = cdr(args);
}
return tee;
}
object *fn_less (object *args, object *env) {
(void) env;
object *arg1 = first(args);
args = cdr(args);
while (args != NULL) {
object *arg2 = first(args);
if (integerp(arg1) && integerp(arg2)) {
if (!(integer(arg1) < integer(arg2))) return nil;
} else if (!(intfloat(arg1) < intfloat(arg2))) return nil;
arg1 = arg2;
args = cdr(args);
}
return tee;
}
object *fn_lesseq (object *args, object *env) {
(void) env;
object *arg1 = first(args);
args = cdr(args);
while (args != NULL) {
object *arg2 = first(args);
if (integerp(arg1) && integerp(arg2)) {
if (!(integer(arg1) <= integer(arg2))) return nil;
} else if (!(intfloat(arg1) <= intfloat(arg2))) return nil;
arg1 = arg2;
args = cdr(args);
}
return tee;
}
object *fn_greater (object *args, object *env) {
(void) env;
object *arg1 = first(args);
args = cdr(args);
while (args != NULL) {
object *arg2 = first(args);
if (integerp(arg1) && integerp(arg2)) {
if (!(integer(arg1) > integer(arg2))) return nil;
} else if (!(intfloat(arg1) > intfloat(arg2))) return nil;
arg1 = arg2;
args = cdr(args);
}
return tee;
}
object *fn_greatereq (object *args, object *env) {
(void) env;
object *arg1 = first(args);
args = cdr(args);
while (args != NULL) {
object *arg2 = first(args);
if (integerp(arg1) && integerp(arg2)) {
if (!(integer(arg1) >= integer(arg2))) return nil;
} else if (!(intfloat(arg1) >= intfloat(arg2))) return nil;
arg1 = arg2;
args = cdr(args);
}
return tee;
}
object *fn_plusp (object *args, object *env) {
(void) env;
object *arg = first(args);
if (floatp(arg)) return (fromfloat(arg) > 0.0) ? tee : nil;
return (integer(arg) > 0) ? tee : nil;
}
object *fn_minusp (object *args, object *env) {
(void) env;
object *arg = first(args);
if (floatp(arg)) return (fromfloat(arg) < 0.0) ? tee : nil;
return (integer(arg) < 0) ? tee : nil;
}
object *fn_zerop (object *args, object *env) {
(void) env;
object *arg = first(args);
if (floatp(arg)) return (fromfloat(arg) == 0.0) ? tee : nil;
return (integer(arg) == 0) ? tee : nil;
}
object *fn_oddp (object *args, object *env) {
(void) env;
return ((integer(first(args)) & 1) == 1) ? tee : nil;
}
object *fn_evenp (object *args, object *env) {
(void) env;
return ((integer(first(args)) & 1) == 0) ? tee : nil;
}
// Number functions
object *fn_integerp (object *args, object *env) {
(void) env;
return integerp(first(args)) ? tee : nil;
}
object *fn_numberp (object *args, object *env) {
(void) env;
object *arg = first(args);
return (integerp(arg) || floatp(arg)) ? tee : nil;
}
// Floating-point functions
object *fn_floatfn (object *args, object *env) {
(void) env;
object *arg = first(args);
return (floatp(arg)) ? arg : makefloat((float)integer(arg));
}
object *fn_floatp (object *args, object *env) {
(void) env;
return floatp(first(args)) ? tee : nil;
}
object *fn_sin (object *args, object *env) {
(void) env;
return makefloat(sin(intfloat(first(args))));
}
object *fn_cos (object *args, object *env) {
(void) env;
return makefloat(cos(intfloat(first(args))));
}
object *fn_tan (object *args, object *env) {
(void) env;
return makefloat(tan(intfloat(first(args))));
}
object *fn_asin (object *args, object *env) {
(void) env;
return makefloat(asin(intfloat(first(args))));
}
object *fn_acos (object *args, object *env) {
(void) env;
return makefloat(acos(intfloat(first(args))));
}
object *fn_atan (object *args, object *env) {
(void) env;
object *arg = first(args);
int div = 1;
args = cdr(args);
if (args != NULL) div = integer(first(args));
return makefloat(atan2(intfloat(arg), div));
}
object *fn_sinh (object *args, object *env) {
(void) env;
return makefloat(sinh(intfloat(first(args))));
}
object *fn_cosh (object *args, object *env) {
(void) env;
return makefloat(cosh(intfloat(first(args))));
}
object *fn_tanh (object *args, object *env) {
(void) env;
return makefloat(tanh(intfloat(first(args))));
}
object *fn_exp (object *args, object *env) {
(void) env;
return makefloat(exp(intfloat(first(args))));
}
object *fn_sqrt (object *args, object *env) {
(void) env;
return makefloat(sqrt(intfloat(first(args))));
}
object *fn_log (object *args, object *env) {
(void) env;
object *arg = first(args);
float fresult = log(intfloat(arg));
args = cdr(args);
if (args == NULL) return makefloat(fresult);
else return makefloat(fresult / log(intfloat(first(args))));
}
int intpower (int base, int exp) {
int result = 1;
while (exp) {
if (exp & 1) result = result * base;
exp = exp / 2;
base = base * base;
}
return result;
}
object *fn_expt (object *args, object *env) {
(void) env;
object *arg1 = first(args); object *arg2 = second(args);
float float1 = intfloat(arg1);
float value = log(abs(float1)) * intfloat(arg2);
if (integerp(arg1) && integerp(arg2) && (integer(arg2) > 0) && (abs(value) < 21.4875))
return number(intpower(integer(arg1), integer(arg2)));
if (float1 < 0) error(PSTR("'expt' invalid result"));
return makefloat(exp(value));
}
object *fn_ceiling (object *args, object *env) {
(void) env;
object *arg = first(args);
args = cdr(args);
if (args != NULL) return number(ceil(intfloat(arg) / intfloat(first(args))));
else return number(ceil(intfloat(arg)));
}
object *fn_floor (object *args, object *env) {
(void) env;
object *arg = first(args);
args = cdr(args);
if (args != NULL) return number(floor(intfloat(arg) / intfloat(first(args))));
else return number(floor(intfloat(arg)));
}
object *fn_truncate (object *args, object *env) {
(void) env;
object *arg = first(args);
args = cdr(args);
if (args != NULL) return number((int)(intfloat(arg) / intfloat(first(args))));
else return number((int)(intfloat(arg)));
}
int myround (float number) {
return (number >= 0) ? (int)(number + 0.5) : (int)(number - 0.5);
}
object *fn_round (object *args, object *env) {
(void) env;
object *arg = first(args);
args = cdr(args);
if (args != NULL) return number(myround(intfloat(arg) / intfloat(first(args))));
else return number(myround(intfloat(arg)));
}
// Characters
object *fn_char (object *args, object *env) {
(void) env;
object *arg = first(args);
if (!stringp(arg)) error2(arg, PSTR("is not a string"));
char c = nthchar(arg, integer(second(args)));
if (c == 0) error(PSTR("'char' index out of range"));
return character(c);
}
object *fn_charcode (object *args, object *env) {
(void) env;
return number(fromchar(first(args)));
}
object *fn_codechar (object *args, object *env) {
(void) env;
return character(integer(first(args)));
}
object *fn_characterp (object *args, object *env) {
(void) env;
return characterp(first(args)) ? tee : nil;
}
// Strings
object *fn_stringp (object *args, object *env) {
(void) env;
return stringp(first(args)) ? tee : nil;
}
bool stringcompare (object *args, bool lt, bool gt, bool eq) {
object *arg1 = first(args);
object *arg2 = second(args);
if (!stringp(arg1) || !stringp(arg2)) error(PSTR("String compare argument is not a string"));
arg1 = cdr(arg1);
arg2 = cdr(arg2);
while ((arg1 != NULL) || (arg2 != NULL)) {
if (arg1 == NULL) return lt;
if (arg2 == NULL) return gt;
if (arg1->integer < arg2->integer) return lt;
if (arg1->integer > arg2->integer) return gt;
arg1 = car(arg1);
arg2 = car(arg2);
}
return eq;
}
object *fn_stringeq (object *args, object *env) {
(void) env;
return stringcompare(args, false, false, true) ? tee : nil;
}
object *fn_stringless (object *args, object *env) {
(void) env;
return stringcompare(args, true, false, false) ? tee : nil;
}
object *fn_stringgreater (object *args, object *env) {
(void) env;
return stringcompare(args, false, true, false) ? tee : nil;
}
object *fn_sort (object *args, object *env) {
if (first(args) == NULL) return nil;
object *list = cons(nil,first(args));
push(list,GCStack);
object *predicate = second(args);
object *compare = cons(NULL,cons(NULL,NULL));
object *ptr = cdr(list);
while (cdr(ptr) != NULL) {
object *go = list;
while (go != ptr) {
car(compare) = car(cdr(ptr));
car(cdr(compare)) = car(cdr(go));
if (apply(predicate, compare, &env)) break;
go = cdr(go);
}
if (go != ptr) {
object *obj = cdr(ptr);
cdr(ptr) = cdr(obj);
cdr(obj) = cdr(go);
cdr(go) = obj;
} else ptr = cdr(ptr);
}
pop(GCStack);
return cdr(list);
}
object *fn_stringfn (object *args, object *env) {
(void) env;
object *arg = first(args);
int type = arg->type;
if (type == STRING) return arg;
object *obj = myalloc();
obj->type = STRING;
if (type == CHARACTER) {
object *cell = myalloc();
cell->car = NULL;
uint8_t shift = (sizeof(int)-1)*8;
cell->integer = fromchar(arg)<<shift;
obj->cdr = cell;
} else if (type == SYMBOL) {
char *s = name(arg);
char ch = *s++;
object *head = NULL;
int chars = 0;
while (ch) {
if (ch == '\\') ch = *s++;
buildstring(ch, &chars, &head);
ch = *s++;
}
obj->cdr = head;
} else error(PSTR("Cannot convert to string"));
return obj;
}
object *fn_concatenate (object *args, object *env) {
(void) env;
object *arg = first(args);
symbol_t name = arg->name;
if (name != STRINGFN) error(PSTR("'concatenate' only supports strings"));
args = cdr(args);
object *result = myalloc();
result->type = STRING;
object *head = NULL;
int chars = 0;
while (args != NULL) {
object *obj = first(args);
if (obj->type != STRING) error2(obj, PSTR("not a string"));
obj = cdr(obj);
while (obj != NULL) {
int quad = obj->integer;
while (quad != 0) {
char ch = quad>>((sizeof(int)-1)*8) & 0xFF;
buildstring(ch, &chars, &head);
quad = quad<<8;
}
obj = car(obj);
}
args = cdr(args);
}
result->cdr = head;
return result;
}
object *fn_subseq (object *args, object *env) {
(void) env;
object *arg = first(args);
if (!stringp(arg)) error(PSTR("'subseq' first argument is not a string"));
int start = integer(second(args));
int end;
args = cddr(args);
if (args != NULL) end = integer(car(args)); else end = stringlength(arg);
object *result = myalloc();
result->type = STRING;
object *head = NULL;
int chars = 0;
for (int i=start; i<end; i++) {
char ch = nthchar(arg, i);
if (ch == 0) error(PSTR("'subseq' index out of range"));
buildstring(ch, &chars, &head);
}
result->cdr = head;
return result;
}
int gstr () {
if (LastChar) {
char temp = LastChar;
LastChar = 0;
return temp;
}
char c = nthchar(GlobalString, GlobalStringIndex++);
return (c != 0) ? c : '\n'; // -1?
}
object *fn_readfromstring (object *args, object *env) {
(void) env;
object *arg = first(args);
if (!stringp(arg)) error(PSTR("'read-from-string' argument is not a string"));
GlobalString = arg;
GlobalStringIndex = 0;
return read(gstr);
}
void pstr (char c) {
buildstring(c, &GlobalStringIndex, &GlobalString);
}
object *fn_princtostring (object *args, object *env) {
(void) env;
object *arg = first(args);
object *obj = myalloc();
obj->type = STRING;
GlobalString = NULL;
GlobalStringIndex = 0;
char temp = PrintReadably;
PrintReadably = 0;
printobject(arg, pstr);
PrintReadably = temp;
obj->cdr = GlobalString;
return obj;
}
object *fn_prin1tostring (object *args, object *env) {
(void) env;
object *arg = first(args);
object *obj = myalloc();
obj->type = STRING;
GlobalString = NULL;
GlobalStringIndex = 0;
printobject(arg, pstr);
obj->cdr = GlobalString;
return obj;
}
// Bitwise operators
object *fn_logand (object *args, object *env) {
(void) env;
int result = -1;
while (args != NULL) {
result = result & integer(first(args));
args = cdr(args);
}
return number(result);
}
object *fn_logior (object *args, object *env) {
(void) env;
int result = 0;
while (args != NULL) {
result = result | integer(first(args));
args = cdr(args);
}
return number(result);
}
object *fn_logxor (object *args, object *env) {
(void) env;
int result = 0;
while (args != NULL) {
result = result ^ integer(first(args));
args = cdr(args);
}
return number(result);
}
object *fn_lognot (object *args, object *env) {
(void) env;
int result = integer(car(args));
return number(~result);
}
object *fn_ash (object *args, object *env) {
(void) env;
int value = integer(first(args));
int count = integer(second(args));
if (count >= 0)
return number(value << count);
else
return number(value >> abs(count));
}
object *fn_logbitp (object *args, object *env) {
(void) env;
int index = integer(first(args));
int value = integer(second(args));
return (bitRead(value, index) == 1) ? tee : nil;
}
// System functions
object *fn_eval (object *args, object *env) {
return eval(first(args), env);
}
object *fn_globals (object *args, object *env) {
(void) args;
if (GlobalEnv == NULL) return nil;
return fn_mapcar(cons(symbol(CAR),cons(GlobalEnv,nil)), env);
}
object *fn_locals (object *args, object *env) {
(void) args;
return env;
}
object *fn_makunbound (object *args, object *env) {
(void) env;
object *key = first(args);
deletesymbol(key->name);
return (delassoc(key, &GlobalEnv) != NULL) ? tee : nil;
}
object *fn_break (object *args, object *env) {
(void) args;
pfstring(PSTR("\rBreak!\r"), pserial);
BreakLevel++;
repl(env);
BreakLevel--;
return nil;
}
object *fn_read (object *args, object *env) {
(void) env;
gfun_t gfun = gstreamfun(args);
return read(gfun);
}
object *fn_prin1 (object *args, object *env) {
(void) env;
object *obj = first(args);
pfun_t pfun = pstreamfun(cdr(args));
printobject(obj, pfun);
return obj;
}
object *fn_print (object *args, object *env) {
(void) env;
object *obj = first(args);
pfun_t pfun = pstreamfun(cdr(args));
pln(pfun);
printobject(obj, pfun);
(pfun)(' ');
return obj;
}
object *fn_princ (object *args, object *env) {
(void) env;
object *obj = first(args);
pfun_t pfun = pstreamfun(cdr(args));
char temp = PrintReadably;
PrintReadably = 0;
printobject(obj, pfun);
PrintReadably = temp;
return obj;
}
object *fn_terpri (object *args, object *env) {
(void) env;
pfun_t pfun = pstreamfun(args);
pln(pfun);
return nil;
}
object *fn_readbyte (object *args, object *env) {
(void) env;
gfun_t gfun = gstreamfun(args);
int c = gfun();
return (c == -1) ? nil : number(c);
}
object *fn_readline (object *args, object *env) {
(void) env;
gfun_t gfun = gstreamfun(args);
return readstring('\n', gfun);
}
object *fn_writebyte (object *args, object *env) {
(void) env;
int value = integer(first(args));
pfun_t pfun = pstreamfun(cdr(args));
(pfun)(value);
return nil;
}
object *fn_writestring (object *args, object *env) {
(void) env;
object *obj = first(args);
pfun_t pfun = pstreamfun(cdr(args));
char temp = PrintReadably;
PrintReadably = 0;
printstring(obj, pfun);
PrintReadably = temp;
return nil;
}
object *fn_writeline (object *args, object *env) {
(void) env;
object *obj = first(args);
pfun_t pfun = pstreamfun(cdr(args));
char temp = PrintReadably;
PrintReadably = 0;
printstring(obj, pfun);
pln(pfun);
PrintReadably = temp;
return nil;
}
object *fn_restarti2c (object *args, object *env) {
(void) env;
int stream = first(args)->integer;
args = cdr(args);
int read = 0; // Write
I2CCount = 0;
if (args != NULL) {
object *rw = first(args);
if (integerp(rw)) I2CCount = integer(rw);
read = (rw != NULL);
}
int address = stream & 0xFF;
if (stream>>8 != I2CSTREAM) error(PSTR("'restart' not i2c"));
return I2Crestart(address, read) ? tee : nil;
}
object *fn_gc (object *obj, object *env) {
int initial = Freespace;
unsigned long start = micros();
gc(obj, env);
unsigned long elapsed = micros() - start;
pfstring(PSTR("Space: "), pserial);
pint(Freespace - initial, pserial);
pfstring(PSTR(" bytes, Time: "), pserial);
pint(elapsed, pserial);
pfstring(PSTR(" us\r"), pserial);
return nil;
}
object *fn_room (object *args, object *env) {
(void) args, (void) env;
return number(Freespace);
}
object *fn_saveimage (object *args, object *env) {
if (args != NULL) args = eval(first(args), env);
return number(saveimage(args));
}
object *fn_loadimage (object *args, object *env) {
(void) env;
if (args != NULL) args = first(args);
return number(loadimage(args));
}
object *fn_cls (object *args, object *env) {
(void) args, (void) env;
pserial(12);
return nil;
}
// Arduino procedures
object *fn_pinmode (object *args, object *env) {
(void) env;
int pin = integer(first(args));
object *mode = second(args);
if ((integerp(mode) && mode->integer == 1) || mode != nil) pinMode(pin, OUTPUT);
else if (integerp(mode) && mode->integer == 2) pinMode(pin, INPUT_PULLUP);
#if defined(INPUT_PULLDOWN)
else if (integerp(mode) && mode->integer == 4) pinMode(pin, INPUT_PULLDOWN);
#endif
else pinMode(pin, INPUT);
return nil;
}
object *fn_digitalread (object *args, object *env) {
(void) env;
int pin = integer(first(args));
if (digitalRead(pin) != 0) return tee; else return nil;
}
object *fn_digitalwrite (object *args, object *env) {
(void) env;
int pin = integer(first(args));
object *mode = second(args);
if (integerp(mode)) digitalWrite(pin, mode->integer);
else digitalWrite(pin, (mode != nil));
return mode;
}
object *fn_analogread (object *args, object *env) {
(void) env;
int pin = integer(first(args));
checkanalogread(pin);
return number(analogRead(pin));
}
object *fn_analogwrite (object *args, object *env) {
(void) env;
int pin = integer(first(args));
checkanalogwrite(pin);
object *value = second(args);
analogWrite(pin, integer(value));
return value;
}
object *fn_delay (object *args, object *env) {
(void) env;
object *arg1 = first(args);
delay(integer(arg1));
return arg1;
}
object *fn_millis (object *args, object *env) {
(void) args, (void) env;
return number(millis());
}
object *fn_sleep (object *args, object *env) {
(void) env;
object *arg1 = first(args);
sleep(integer(arg1));
return arg1;
}
object *fn_note (object *args, object *env) {
(void) env;
static int pin = 255;
if (args != NULL) {
pin = integer(first(args));
int note = 0;
if (cddr(args) != NULL) note = integer(second(args));
int octave = 0;
if (cddr(args) != NULL) octave = integer(third(args));
playnote(pin, note, octave);
} else nonote(pin);
return nil;
}
// Tree Editor
object *fn_edit (object *args, object *env) {
object *fun = first(args);
object *pair = findvalue(fun, env);
clrflag(EXITEDITOR);
object *arg = edit(eval(fun, env));
cdr(pair) = arg;
return arg;
}
object *edit (object *fun) {
while (1) {
if (tstflag(EXITEDITOR)) return fun;
char c = gserial();
if (c == 'q') setflag(EXITEDITOR);
else if (c == 'b') return fun;
else if (c == 'r') fun = read(gserial);
else if (c == '\n') { pfl(pserial); superprint(fun, 0, pserial); pln(pserial); }
else if (c == 'c') fun = cons(read(gserial), fun);
else if (atom(fun)) pserial('!');
else if (c == 'd') fun = cons(car(fun), edit(cdr(fun)));
else if (c == 'a') fun = cons(edit(car(fun)), cdr(fun));
else if (c == 'x') fun = cdr(fun);
else pserial('?');
}
}
// Pretty printer
const int PPINDENT = 2;
const int PPWIDTH = 80;
void pcount (char c) {
LastPrint = c;
if (c == '\n') GlobalStringIndex++;
GlobalStringIndex++;
}
int atomwidth (object *obj) {
GlobalStringIndex = 0;
printobject(obj, pcount);
return GlobalStringIndex;
}
boolean quoted (object *obj) {
return (consp(obj) && car(obj) != NULL && car(obj)->name == QUOTE && consp(cdr(obj)) && cddr(obj) == NULL);
}
int subwidth (object *obj, int w) {
if (atom(obj)) return w - atomwidth(obj);
if (quoted(obj)) return subwidthlist(car(cdr(obj)), w - 1);
return subwidthlist(obj, w - 1);
}
int subwidthlist (object *form, int w) {
while (form != NULL && w >= 0) {
if (atom(form)) return w - (2 + atomwidth(form));
w = subwidth(car(form), w - 1);
form = cdr(form);
}
return w;
}
void superprint (object *form, int lm, pfun_t pfun) {
if (atom(form)) {
if (symbolp(form) && form->name == NOTHING) pstring(name(form), pfun);
else printobject(form, pfun);
}
else if (quoted(form)) { pfun('\''); superprint(car(cdr(form)), lm + 1, pfun); }
else if (subwidth(form, PPWIDTH - lm) >= 0) supersub(form, lm + PPINDENT, 0, pfun);
else supersub(form, lm + PPINDENT, 1, pfun);
}
const int ppspecials = 14;
const char ppspecial[ppspecials] PROGMEM =
{ DOTIMES, DOLIST, IF, SETQ, TEE, LET, LETSTAR, LAMBDA, WHEN, UNLESS, WITHI2C, WITHSERIAL, WITHSPI, WITHSDCARD };
void supersub (object *form, int lm, int super, pfun_t pfun) {
int special = 0, separate = 1;
object *arg = car(form);
if (symbolp(arg)) {
int name = arg->name;
if (name == DEFUN) special = 2;
else for (int i=0; i<ppspecials; i++) {
if (name == ppspecial[i]) { special = 1; break; }
}
}
while (form != NULL) {
if (atom(form)) { pfstring(PSTR(" . "), pfun); printobject(form, pfun); pfun(')'); return; }
else if (separate) { pfun('('); separate = 0; }
else if (special) { pfun(' '); special--; }
else if (!super) pfun(' ');
else { pln(pfun); indent(lm, pfun); }
superprint(car(form), lm, pfun);
form = cdr(form);
}
pfun(')'); return;
}
object *fn_pprint (object *args, object *env) {
(void) env;
object *obj = first(args);
pfun_t pfun = pstreamfun(cdr(args));
pln(pfun);
superprint(obj, 0, pfun);
return symbol(NOTHING);
}
object *fn_pprintall (object *args, object *env) {
(void) args, (void) env;
object *globals = GlobalEnv;
while (globals != NULL) {
object *pair = first(globals);
object *var = car(pair);
object *val = cdr(pair);
if (listp(val) && symbolp(car(val)) && car(val)->name == LAMBDA) {
pln(pserial);
superprint(cons(symbol(DEFUN), cons(var, cdr(val))), 0, pserial);
pln(pserial);
}
globals = cdr(globals);
}
return symbol(NOTHING);
}
// Insert your own function definitions here
// Built-in procedure names - stored in PROGMEM
const char string0[] PROGMEM = "symbols";
const char string1[] PROGMEM = "nil";
const char string2[] PROGMEM = "t";
const char string3[] PROGMEM = "nothing";
const char string4[] PROGMEM = "&rest";
const char string5[] PROGMEM = "lambda";
const char string6[] PROGMEM = "let";
const char string7[] PROGMEM = "let*";
const char string8[] PROGMEM = "closure";
const char string9[] PROGMEM = "special_forms";
const char string10[] PROGMEM = "quote";
const char string11[] PROGMEM = "defun";
const char string12[] PROGMEM = "defvar";
const char string13[] PROGMEM = "setq";
const char string14[] PROGMEM = "loop";
const char string15[] PROGMEM = "push";
const char string16[] PROGMEM = "pop";
const char string17[] PROGMEM = "incf";
const char string18[] PROGMEM = "decf";
const char string19[] PROGMEM = "setf";
const char string20[] PROGMEM = "dolist";
const char string21[] PROGMEM = "dotimes";
const char string22[] PROGMEM = "trace";
const char string23[] PROGMEM = "untrace";
const char string24[] PROGMEM = "for-millis";
const char string25[] PROGMEM = "with-serial";
const char string26[] PROGMEM = "with-i2c";
const char string27[] PROGMEM = "with-spi";
const char string28[] PROGMEM = "with-sd-card";
const char string29[] PROGMEM = "tail_forms";
const char string30[] PROGMEM = "progn";
const char string31[] PROGMEM = "return";
const char string32[] PROGMEM = "if";
const char string33[] PROGMEM = "cond";
const char string34[] PROGMEM = "when";
const char string35[] PROGMEM = "unless";
const char string36[] PROGMEM = "and";
const char string37[] PROGMEM = "or";
const char string38[] PROGMEM = "functions";
const char string39[] PROGMEM = "not";
const char string40[] PROGMEM = "null";
const char string41[] PROGMEM = "cons";
const char string42[] PROGMEM = "atom";
const char string43[] PROGMEM = "listp";
const char string44[] PROGMEM = "consp";
const char string45[] PROGMEM = "symbolp";
const char string46[] PROGMEM = "streamp";
const char string47[] PROGMEM = "eq";
const char string48[] PROGMEM = "car";
const char string49[] PROGMEM = "first";
const char string50[] PROGMEM = "cdr";
const char string51[] PROGMEM = "rest";
const char string52[] PROGMEM = "caar";
const char string53[] PROGMEM = "cadr";
const char string54[] PROGMEM = "second";
const char string55[] PROGMEM = "cdar";
const char string56[] PROGMEM = "cddr";
const char string57[] PROGMEM = "caaar";
const char string58[] PROGMEM = "caadr";
const char string59[] PROGMEM = "cadar";
const char string60[] PROGMEM = "caddr";
const char string61[] PROGMEM = "third";
const char string62[] PROGMEM = "cdaar";
const char string63[] PROGMEM = "cdadr";
const char string64[] PROGMEM = "cddar";
const char string65[] PROGMEM = "cdddr";
const char string66[] PROGMEM = "length";
const char string67[] PROGMEM = "list";
const char string68[] PROGMEM = "reverse";
const char string69[] PROGMEM = "nth";
const char string70[] PROGMEM = "assoc";
const char string71[] PROGMEM = "member";
const char string72[] PROGMEM = "apply";
const char string73[] PROGMEM = "funcall";
const char string74[] PROGMEM = "append";
const char string75[] PROGMEM = "mapc";
const char string76[] PROGMEM = "mapcar";
const char string77[] PROGMEM = "+";
const char string78[] PROGMEM = "-";
const char string79[] PROGMEM = "*";
const char string80[] PROGMEM = "/";
const char string81[] PROGMEM = "mod";
const char string82[] PROGMEM = "1+";
const char string83[] PROGMEM = "1-";
const char string84[] PROGMEM = "abs";
const char string85[] PROGMEM = "random";
const char string86[] PROGMEM = "max";
const char string87[] PROGMEM = "min";
const char string88[] PROGMEM = "/=";
const char string89[] PROGMEM = "=";
const char string90[] PROGMEM = "<";
const char string91[] PROGMEM = "<=";
const char string92[] PROGMEM = ">";
const char string93[] PROGMEM = ">=";
const char string94[] PROGMEM = "plusp";
const char string95[] PROGMEM = "minusp";
const char string96[] PROGMEM = "zerop";
const char string97[] PROGMEM = "oddp";
const char string98[] PROGMEM = "evenp";
const char string99[] PROGMEM = "integerp";
const char string100[] PROGMEM = "numberp";
const char string101[] PROGMEM = "float";
const char string102[] PROGMEM = "floatp";
const char string103[] PROGMEM = "sin";
const char string104[] PROGMEM = "cos";
const char string105[] PROGMEM = "tan";
const char string106[] PROGMEM = "asin";
const char string107[] PROGMEM = "acos";
const char string108[] PROGMEM = "atan";
const char string109[] PROGMEM = "sinh";
const char string110[] PROGMEM = "cosh";
const char string111[] PROGMEM = "tanh";
const char string112[] PROGMEM = "exp";
const char string113[] PROGMEM = "sqrt";
const char string114[] PROGMEM = "log";
const char string115[] PROGMEM = "expt";
const char string116[] PROGMEM = "ceiling";
const char string117[] PROGMEM = "floor";
const char string118[] PROGMEM = "truncate";
const char string119[] PROGMEM = "round";
const char string120[] PROGMEM = "char";
const char string121[] PROGMEM = "char-code";
const char string122[] PROGMEM = "code-char";
const char string123[] PROGMEM = "characterp";
const char string124[] PROGMEM = "stringp";
const char string125[] PROGMEM = "string=";
const char string126[] PROGMEM = "string<";
const char string127[] PROGMEM = "string>";
const char string128[] PROGMEM = "sort";
const char string129[] PROGMEM = "string";
const char string130[] PROGMEM = "concatenate";
const char string131[] PROGMEM = "subseq";
const char string132[] PROGMEM = "read-from-string";
const char string133[] PROGMEM = "princ-to-string";
const char string134[] PROGMEM = "prin1-to-string";
const char string135[] PROGMEM = "logand";
const char string136[] PROGMEM = "logior";
const char string137[] PROGMEM = "logxor";
const char string138[] PROGMEM = "lognot";
const char string139[] PROGMEM = "ash";
const char string140[] PROGMEM = "logbitp";
const char string141[] PROGMEM = "eval";
const char string142[] PROGMEM = "globals";
const char string143[] PROGMEM = "locals";
const char string144[] PROGMEM = "makunbound";
const char string145[] PROGMEM = "break";
const char string146[] PROGMEM = "read";
const char string147[] PROGMEM = "prin1";
const char string148[] PROGMEM = "print";
const char string149[] PROGMEM = "princ";
const char string150[] PROGMEM = "terpri";
const char string151[] PROGMEM = "read-byte";
const char string152[] PROGMEM = "read-line";
const char string153[] PROGMEM = "write-byte";
const char string154[] PROGMEM = "write-string";
const char string155[] PROGMEM = "write-line";
const char string156[] PROGMEM = "restart-i2c";
const char string157[] PROGMEM = "gc";
const char string158[] PROGMEM = "room";
const char string159[] PROGMEM = "save-image";
const char string160[] PROGMEM = "load-image";
const char string161[] PROGMEM = "cls";
const char string162[] PROGMEM = "pinmode";
const char string163[] PROGMEM = "digitalread";
const char string164[] PROGMEM = "digitalwrite";
const char string165[] PROGMEM = "analogread";
const char string166[] PROGMEM = "analogwrite";
const char string167[] PROGMEM = "delay";
const char string168[] PROGMEM = "millis";
const char string169[] PROGMEM = "sleep";
const char string170[] PROGMEM = "note";
const char string171[] PROGMEM = "edit";
const char string172[] PROGMEM = "pprint";
const char string173[] PROGMEM = "pprintall";
const tbl_entry_t lookup_table[] PROGMEM = {
{ string0, NULL, NIL, NIL },
{ string1, NULL, 0, 0 },
{ string2, NULL, 1, 0 },
{ string3, NULL, 1, 0 },
{ string4, NULL, 1, 0 },
{ string5, NULL, 0, 127 },
{ string6, NULL, 0, 127 },
{ string7, NULL, 0, 127 },
{ string8, NULL, 0, 127 },
{ string9, NULL, NIL, NIL },
{ string10, sp_quote, 1, 1 },
{ string11, sp_defun, 0, 127 },
{ string12, sp_defvar, 2, 2 },
{ string13, sp_setq, 2, 2 },
{ string14, sp_loop, 0, 127 },
{ string15, sp_push, 2, 2 },
{ string16, sp_pop, 1, 1 },
{ string17, sp_incf, 1, 2 },
{ string18, sp_decf, 1, 2 },
{ string19, sp_setf, 2, 2 },
{ string20, sp_dolist, 1, 127 },
{ string21, sp_dotimes, 1, 127 },
{ string22, sp_trace, 0, 1 },
{ string23, sp_untrace, 0, 1 },
{ string24, sp_formillis, 1, 127 },
{ string25, sp_withserial, 1, 127 },
{ string26, sp_withi2c, 1, 127 },
{ string27, sp_withspi, 1, 127 },
{ string28, sp_withsdcard, 2, 127 },
{ string29, NULL, NIL, NIL },
{ string30, tf_progn, 0, 127 },
{ string31, tf_return, 0, 127 },
{ string32, tf_if, 2, 3 },
{ string33, tf_cond, 0, 127 },
{ string34, tf_when, 1, 127 },
{ string35, tf_unless, 1, 127 },
{ string36, tf_and, 0, 127 },
{ string37, tf_or, 0, 127 },
{ string38, NULL, NIL, NIL },
{ string39, fn_not, 1, 1 },
{ string40, fn_not, 1, 1 },
{ string41, fn_cons, 2, 2 },
{ string42, fn_atom, 1, 1 },
{ string43, fn_listp, 1, 1 },
{ string44, fn_consp, 1, 1 },
{ string45, fn_symbolp, 1, 1 },
{ string46, fn_streamp, 1, 1 },
{ string47, fn_eq, 2, 2 },
{ string48, fn_car, 1, 1 },
{ string49, fn_car, 1, 1 },
{ string50, fn_cdr, 1, 1 },
{ string51, fn_cdr, 1, 1 },
{ string52, fn_caar, 1, 1 },
{ string53, fn_cadr, 1, 1 },
{ string54, fn_cadr, 1, 1 },
{ string55, fn_cdar, 1, 1 },
{ string56, fn_cddr, 1, 1 },
{ string57, fn_caaar, 1, 1 },
{ string58, fn_caadr, 1, 1 },
{ string59, fn_cadar, 1, 1 },
{ string60, fn_caddr, 1, 1 },
{ string61, fn_caddr, 1, 1 },
{ string62, fn_cdaar, 1, 1 },
{ string63, fn_cdadr, 1, 1 },
{ string64, fn_cddar, 1, 1 },
{ string65, fn_cdddr, 1, 1 },
{ string66, fn_length, 1, 1 },
{ string67, fn_list, 0, 127 },
{ string68, fn_reverse, 1, 1 },
{ string69, fn_nth, 2, 2 },
{ string70, fn_assoc, 2, 2 },
{ string71, fn_member, 2, 2 },
{ string72, fn_apply, 2, 127 },
{ string73, fn_funcall, 1, 127 },
{ string74, fn_append, 0, 127 },
{ string75, fn_mapc, 2, 3 },
{ string76, fn_mapcar, 2, 3 },
{ string77, fn_add, 0, 127 },
{ string78, fn_subtract, 1, 127 },
{ string79, fn_multiply, 0, 127 },
{ string80, fn_divide, 1, 127 },
{ string81, fn_mod, 2, 2 },
{ string82, fn_oneplus, 1, 1 },
{ string83, fn_oneminus, 1, 1 },
{ string84, fn_abs, 1, 1 },
{ string85, fn_random, 1, 1 },
{ string86, fn_maxfn, 1, 127 },
{ string87, fn_minfn, 1, 127 },
{ string88, fn_noteq, 1, 127 },
{ string89, fn_numeq, 1, 127 },
{ string90, fn_less, 1, 127 },
{ string91, fn_lesseq, 1, 127 },
{ string92, fn_greater, 1, 127 },
{ string93, fn_greatereq, 1, 127 },
{ string94, fn_plusp, 1, 1 },
{ string95, fn_minusp, 1, 1 },
{ string96, fn_zerop, 1, 1 },
{ string97, fn_oddp, 1, 1 },
{ string98, fn_evenp, 1, 1 },
{ string99, fn_integerp, 1, 1 },
{ string100, fn_numberp, 1, 1 },
{ string101, fn_floatfn, 1, 1 },
{ string102, fn_floatp, 1, 1 },
{ string103, fn_sin, 1, 1 },
{ string104, fn_cos, 1, 1 },
{ string105, fn_tan, 1, 1 },
{ string106, fn_asin, 1, 1 },
{ string107, fn_acos, 1, 1 },
{ string108, fn_atan, 1, 2 },
{ string109, fn_sinh, 1, 1 },
{ string110, fn_cosh, 1, 1 },
{ string111, fn_tanh, 1, 1 },
{ string112, fn_exp, 1, 1 },
{ string113, fn_sqrt, 1, 1 },
{ string114, fn_log, 1, 2 },
{ string115, fn_expt, 2, 2 },
{ string116, fn_ceiling, 1, 2 },
{ string117, fn_floor, 1, 2 },
{ string118, fn_truncate, 1, 2 },
{ string119, fn_round, 1, 2 },
{ string120, fn_char, 2, 2 },
{ string121, fn_charcode, 1, 1 },
{ string122, fn_codechar, 1, 1 },
{ string123, fn_characterp, 1, 1 },
{ string124, fn_stringp, 1, 1 },
{ string125, fn_stringeq, 2, 2 },
{ string126, fn_stringless, 2, 2 },
{ string127, fn_stringgreater, 2, 2 },
{ string128, fn_sort, 2, 2 },
{ string129, fn_stringfn, 1, 1 },
{ string130, fn_concatenate, 1, 127 },
{ string131, fn_subseq, 2, 3 },
{ string132, fn_readfromstring, 1, 1 },
{ string133, fn_princtostring, 1, 1 },
{ string134, fn_prin1tostring, 1, 1 },
{ string135, fn_logand, 0, 127 },
{ string136, fn_logior, 0, 127 },
{ string137, fn_logxor, 0, 127 },
{ string138, fn_lognot, 1, 1 },
{ string139, fn_ash, 2, 2 },
{ string140, fn_logbitp, 2, 2 },
{ string141, fn_eval, 1, 1 },
{ string142, fn_globals, 0, 0 },
{ string143, fn_locals, 0, 0 },
{ string144, fn_makunbound, 1, 1 },
{ string145, fn_break, 0, 0 },
{ string146, fn_read, 0, 1 },
{ string147, fn_prin1, 1, 2 },
{ string148, fn_print, 1, 2 },
{ string149, fn_princ, 1, 2 },
{ string150, fn_terpri, 0, 1 },
{ string151, fn_readbyte, 0, 2 },
{ string152, fn_readline, 0, 1 },
{ string153, fn_writebyte, 1, 2 },
{ string154, fn_writestring, 1, 2 },
{ string155, fn_writeline, 1, 2 },
{ string156, fn_restarti2c, 1, 2 },
{ string157, fn_gc, 0, 0 },
{ string158, fn_room, 0, 0 },
{ string159, fn_saveimage, 0, 1 },
{ string160, fn_loadimage, 0, 1 },
{ string161, fn_cls, 0, 0 },
{ string162, fn_pinmode, 2, 2 },
{ string163, fn_digitalread, 1, 1 },
{ string164, fn_digitalwrite, 2, 2 },
{ string165, fn_analogread, 1, 1 },
{ string166, fn_analogwrite, 2, 2 },
{ string167, fn_delay, 1, 1 },
{ string168, fn_millis, 0, 0 },
{ string169, fn_sleep, 1, 1 },
{ string170, fn_note, 0, 3 },
{ string171, fn_edit, 1, 1 },
{ string172, fn_pprint, 1, 2 },
{ string173, fn_pprintall, 0, 0 },
};
// Table lookup functions
int builtin (char* n) {
int entry = 0;
while (entry < ENDFUNCTIONS) {
if (strcmp(n, (char*)lookup_table[entry].string) == 0)
return entry;
entry++;
}
return ENDFUNCTIONS;
}
int longsymbol (char *buffer) {
char *p = SymbolTable;
int i = 0;
while (strcmp(p, buffer) != 0) {p = p + strlen(p) + 1; i++; }
if (p == buffer) {
// Add to symbol table?
char *newtop = SymbolTop + strlen(p) + 1;
if (SYMBOLTABLESIZE - (newtop - SymbolTable) < BUFFERSIZE) error(PSTR("No room for long symbols"));
SymbolTop = newtop;
}
if (i > 1535) error(PSTR("Too many long symbols"));
return i + 64000; // First number unused by radix40
}
intptr_t lookupfn (symbol_t name) {
return (intptr_t)lookup_table[name].fptr;
}
uint8_t lookupmin (symbol_t name) {
return lookup_table[name].min;
}
uint8_t lookupmax (symbol_t name) {
return lookup_table[name].max;
}
char *lookupbuiltin (symbol_t name) {
char *buffer = SymbolTop;
strcpy(buffer, (char *)lookup_table[name].string);
return buffer;
}
char *lookupsymbol (symbol_t name) {
char *p = SymbolTable;
int i = name - 64000;
while (i > 0 && p < SymbolTop) {p = p + strlen(p) + 1; i--; }
if (p == SymbolTop) return NULL; else return p;
}
void deletesymbol (symbol_t name) {
char *p = lookupsymbol(name);
if (p == NULL) return;
char *q = p + strlen(p) + 1;
*p = '\0'; p++;
while (q < SymbolTop) *(p++) = *(q++);
SymbolTop = p;
}
void testescape () {
if (Serial.read() == '~') error(PSTR("Escape!"));
}
// Main evaluator
uint8_t End;
object *eval (object *form, object *env) {
int TC=0;
EVAL:
// Enough space?
if (End != 0xA5) error(PSTR("Stack overflow"));
if (Freespace <= WORKSPACESIZE>>4) gc(form, env);
// Escape
if (tstflag(ESCAPE)) { clrflag(ESCAPE); error(PSTR("Escape!"));}
#if defined (serialmonitor)
testescape();
#endif
if (form == NULL) return nil;
if (integerp(form) || floatp(form) || characterp(form) || stringp(form)) return form;
if (symbolp(form)) {
symbol_t name = form->name;
if (name == NIL) return nil;
object *pair = value(name, env);
if (pair != NULL) return cdr(pair);
pair = value(name, GlobalEnv);
if (pair != NULL) return cdr(pair);
else if (name <= ENDFUNCTIONS) return form;
error2(form, PSTR("undefined"));
}
// It's a list
object *function = car(form);
object *args = cdr(form);
if (!listp(args)) error(PSTR("Can't evaluate a dotted pair"));
// List starts with a symbol?
if (symbolp(function)) {
symbol_t name = function->name;
if ((name == LET) || (name == LETSTAR)) {
int TCstart = TC;
object *assigns = first(args);
object *forms = cdr(args);
object *newenv = env;
push(newenv, GCStack);
while (assigns != NULL) {
object *assign = car(assigns);
if (!consp(assign)) push(cons(assign,nil), newenv);
else if (cdr(assign) == NULL) push(cons(first(assign),nil), newenv);
else push(cons(first(assign),eval(second(assign),env)), newenv);
car(GCStack) = newenv;
if (name == LETSTAR) env = newenv;
assigns = cdr(assigns);
}
env = newenv;
pop(GCStack);
form = tf_progn(forms,env);
TC = TCstart;
goto EVAL;
}
if (name == LAMBDA) {
if (env == NULL) return form;
object *envcopy = NULL;
while (env != NULL) {
object *pair = first(env);
if (pair != NULL) {
object *val = cdr(pair);
if (integerp(val)) val = number(val->integer);
push(cons(car(pair), val), envcopy);
}
env = cdr(env);
}
return cons(symbol(CLOSURE), cons(envcopy,args));
}
if ((name > SPECIAL_FORMS) && (name < TAIL_FORMS)) {
return ((fn_ptr_type)lookupfn(name))(args, env);
}
if ((name > TAIL_FORMS) && (name < FUNCTIONS)) {
form = ((fn_ptr_type)lookupfn(name))(args, env);
TC = 1;
goto EVAL;
}
}
// Evaluate the parameters - result in head
object *fname = car(form);
int TCstart = TC;
object *head = cons(eval(car(form), env), NULL);
push(head, GCStack); // Don't GC the result list
object *tail = head;
form = cdr(form);
int nargs = 0;
while (form != NULL){
object *obj = cons(eval(car(form),env),NULL);
cdr(tail) = obj;
tail = obj;
form = cdr(form);
nargs++;
}
function = car(head);
args = cdr(head);
if (symbolp(function)) {
symbol_t name = function->name;
if (name >= ENDFUNCTIONS) error2(fname, PSTR("is not valid here"));
if (nargs<lookupmin(name)) error2(fname, PSTR("has too few arguments"));
if (nargs>lookupmax(name)) error2(fname, PSTR("has too many arguments"));
object *result = ((fn_ptr_type)lookupfn(name))(args, env);
pop(GCStack);
return result;
}
if (listp(function) && issymbol(car(function), LAMBDA)) {
form = closure(TCstart, fname, NULL, cdr(function), args, &env);
pop(GCStack);
int trace = tracing(fname->name);
if (trace) {
object *result = eval(form, env);
indent((--(TraceDepth[trace-1]))<<1, pserial);
pint(TraceDepth[trace-1], pserial);
pserial(':'); pserial(' ');
printobject(fname, pserial); pfstring(PSTR(" returned "), pserial);
printobject(result, pserial); pln(pserial);
return result;
} else {
TC = 1;
goto EVAL;
}
}
if (listp(function) && issymbol(car(function), CLOSURE)) {
function = cdr(function);
form = closure(TCstart, fname, car(function), cdr(function), args, &env);
pop(GCStack);
TC = 1;
goto EVAL;
}
error2(fname, PSTR("is an illegal function")); return nil;
}
// Print functions
inline int maxbuffer (char *buffer) {
return SYMBOLTABLESIZE-(buffer-SymbolTable)-1;
}
void pserial (char c) {
LastPrint = c;
if (c == '\n') Serial.write('\r');
Serial.write(c);
}
const char ControlCodes[] PROGMEM = "Null\0SOH\0STX\0ETX\0EOT\0ENQ\0ACK\0Bell\0Backspace\0Tab\0Newline\0VT\0"
"Page\0Return\0SO\0SI\0DLE\0DC1\0DC2\0DC3\0DC4\0NAK\0SYN\0ETB\0CAN\0EM\0SUB\0Escape\0FS\0GS\0RS\0US\0Space\0";
void pcharacter (char c, pfun_t pfun) {
if (!PrintReadably) pfun(c);
else {
pfun('#'); pfun('\\');
if (c > 32) pfun(c);
else {
const char *p = ControlCodes;
while (c > 0) {p = p + strlen(p) + 1; c--; }
pfstring(p, pfun);
}
}
}
void pstring (char *s, pfun_t pfun) {
while (*s) pfun(*s++);
}
void printstring (object *form, pfun_t pfun) {
if (PrintReadably) pfun('"');
form = cdr(form);
while (form != NULL) {
int chars = form->integer;
for (int i=(sizeof(int)-1)*8; i>=0; i=i-8) {
char ch = chars>>i & 0xFF;
if (PrintReadably && (ch == '"' || ch == '\\')) pfun('\\');
if (ch) pfun(ch);
}
form = car(form);
}
if (PrintReadably) pfun('"');
}
void pfstring (const char *s, pfun_t pfun) {
int p = 0;
while (1) {
char c = s[p++];
if (c == 0) return;
pfun(c);
}
}
void pint (int i, pfun_t pfun) {
int lead = 0;
#if INT_MAX == 32767
int p = 10000;
#else
int p = 1000000000;
#endif
if (i<0) pfun('-');
for (int d=p; d>0; d=d/10) {
int j = i/d;
if (j!=0 || lead || d==1) { pfun(abs(j)+'0'); lead=1;}
i = i - j*d;
}
}
void pmantissa (float f, pfun_t pfun) {
int sig = floor(log10(f));
int mul = pow(10, 5 - sig);
int i = round(f * mul);
boolean point = false;
if (i == 1000000) { i = 100000; sig++; }
if (sig < 0) {
pfun('0'); pfun('.'); point = true;
for (int j=0; j < - sig - 1; j++) pfun('0');
}
mul = 100000;
for (int j=0; j<7; j++) {
int d = (int)(i / mul);
pfun(d + '0');
i = i - d * mul;
if (i == 0) { if (!point) { pfun('.'); pfun('0'); } return; }
if (j == sig && sig >= 0) { pfun('.'); point = true; }
mul = mul / 10;
}
}
void pfloat (float f, pfun_t pfun) {
if (isnan(f)) { pfstring(PSTR("NaN"), pfun); return; }
if (f == 0.0) { pfun('0'); return; }
if (isinf(f)) { pfstring(PSTR("Inf"), pfun); return; }
if (f < 0) { pfun('-'); f = -f; }
// Calculate exponent
int e = 0;
if (f < 1e-3 || f >= 1e5) {
e = floor(log(f) / 2.302585); // log10 gives wrong result
f = f / pow(10, e);
}
pmantissa (f, pfun);
// Exponent
if (e != 0) {
pfun('e');
pint(e, pfun);
}
}
inline void pln (pfun_t pfun) {
pfun('\n');
}
void pfl (pfun_t pfun) {
if (LastPrint != '\n') pfun('\n');
}
void printobject (object *form, pfun_t pfun){
if (form == NULL) pfstring(PSTR("nil"), pfun);
else if (listp(form) && issymbol(car(form), CLOSURE)) pfstring(PSTR("<closure>"), pfun);
else if (listp(form)) {
pfun('(');
printobject(car(form), pfun);
form = cdr(form);
while (form != NULL && listp(form)) {
pfun(' ');
printobject(car(form), pfun);
form = cdr(form);
}
if (form != NULL) {
pfstring(PSTR(" . "), pfun);
printobject(form, pfun);
}
pfun(')');
} else if (integerp(form)) {
pint(integer(form), pfun);
} else if (floatp(form)) {
pfloat(fromfloat(form), pfun);
} else if (symbolp(form)) {
if (form->name != NOTHING) pstring(name(form), pfun);
} else if (characterp(form)) {
pcharacter(form->integer, pfun);
} else if (stringp(form)) {
printstring(form, pfun);
} else if (streamp(form)) {
pfstring(PSTR("<"), pfun);
if ((form->integer)>>8 == SPISTREAM) pfstring(PSTR("spi"), pfun);
else if ((form->integer)>>8 == I2CSTREAM) pfstring(PSTR("i2c"), pfun);
else if ((form->integer)>>8 == SDSTREAM) pfstring(PSTR("sd"), pfun);
else pfstring(PSTR("serial"), pfun);
pfstring(PSTR("-stream "), pfun);
pint(form->integer & 0xFF, pfun);
pfun('>');
} else
error(PSTR("Error in print."));
}
// Read functions
#if defined(lisplibrary)
int glibrary () {
if (LastChar) {
char temp = LastChar;
LastChar = 0;
return temp;
}
char c = LispLibrary[GlobalStringIndex++];
return (c != 0) ? c : -1; // -1?
}
void loadfromlibrary (object *env) {
GlobalStringIndex = 0;
object *line = read(glibrary);
while (line != NULL) {
eval(line, env);
line = read(glibrary);
}
}
#endif
int gserial () {
if (LastChar) {
char temp = LastChar;
LastChar = 0;
return temp;
}
while (!Serial.available());
char temp = Serial.read();
if (temp != '\n') pserial(temp);
return temp;
}
object *nextitem (gfun_t gfun) {
int ch = gfun();
while(isspace(ch)) ch = gfun();
if (ch == ';') {
while(ch != '(') ch = gfun();
ch = '(';
}
if (ch == '\n') ch = gfun();
if (ch == -1) return nil;
if (ch == ')') return (object *)KET;
if (ch == '(') return (object *)BRA;
if (ch == '\'') return (object *)QUO;
// Parse string
if (ch == '"') return readstring('"', gfun);
// Parse symbol, character, or number
int index = 0, base = 10, sign = 1;
char *buffer = SymbolTop;
int bufmax = maxbuffer(buffer); // Max index
unsigned int result = 0;
boolean isfloat = false;
float fresult = 0.0;
if (ch == '+') {
buffer[index++] = ch;
ch = gfun();
} else if (ch == '-') {
sign = -1;
buffer[index++] = ch;
ch = gfun();
} else if (ch == '.') {
buffer[index++] = ch;
ch = gfun();
if (ch == ' ') return (object *)DOT;
isfloat = true;
} else if (ch == '#') {
ch = gfun() & ~0x20;
if (ch == '\\') base = 0; // character
else if (ch == 'B') base = 2;
else if (ch == 'O') base = 8;
else if (ch == 'X') base = 16;
else if (ch == 0x07); // Ignore '
else error(PSTR("Illegal character after #"));
ch = gfun();
}
int valid; // 0=undecided, -1=invalid, +1=valid
if (ch == '.') valid = 0; else if (digitvalue(ch)<base) valid = 1; else valid = -1;
boolean isexponent = false;
int exponent = 0, esign = 1;
buffer[2] = '\0'; // In case symbol is one letter
float divisor = 10.0;
while(!isspace(ch) && ch != ')' && ch != '(' && index < bufmax) {
buffer[index++] = ch;
if (base == 10 && ch == '.' && !isexponent) {
isfloat = true;
fresult = result;
} else if (base == 10 && (ch == 'e' || ch == 'E')) {
if (!isfloat) { isfloat = true; fresult = result; }
isexponent = true;
if (valid == 1) valid = 0; else valid = -1;
} else if (isexponent && ch == '-') {
esign = -esign;
} else if (isexponent && ch == '+') {
} else {
int digit = digitvalue(ch);
if (digitvalue(ch)<base && valid != -1) valid = 1; else valid = -1;
if (isexponent) {
exponent = exponent * 10 + digit;
} else if (isfloat) {
fresult = fresult + digit / divisor;
divisor = divisor * 10.0;
} else {
result = result * base + digit;
}
}
ch = gfun();
}
buffer[index] = '\0';
if (ch == ')' || ch == '(') LastChar = ch;
if (isfloat && valid == 1) return makefloat(fresult * sign * pow(10, exponent * esign));
else if (valid == 1) {
if (base == 10 && result > ((unsigned int)INT_MAX+(1-sign)/2))
return makefloat((float)result*sign);
return number(result*sign);
} else if (base == 0) {
if (index == 1) return character(buffer[0]);
const char* p = ControlCodes; char c = 0;
while (c < 33) {
if (strcasecmp(buffer, p) == 0) return character(c);
p = p + strlen(p) + 1; c++;
}
error(PSTR("Unknown character"));
}
int x = builtin(buffer);
if (x == NIL) return nil;
if (x < ENDFUNCTIONS) return newsymbol(x);
else if (index < 4 && valid40(buffer)) return newsymbol(pack40(buffer));
else return newsymbol(longsymbol(buffer));
}
object *readrest (gfun_t gfun) {
object *item = nextitem(gfun);
object *head = NULL;
object *tail = NULL;
while (item != (object *)KET) {
if (item == (object *)BRA) {
item = readrest(gfun);
} else if (item == (object *)QUO) {
item = cons(symbol(QUOTE), cons(read(gfun), NULL));
} else if (item == (object *)DOT) {
tail->cdr = read(gfun);
if (readrest(gfun) != NULL) error(PSTR("Malformed list"));
return head;
} else {
object *cell = cons(item, NULL);
if (head == NULL) head = cell;
else tail->cdr = cell;
tail = cell;
item = nextitem(gfun);
}
}
return head;
}
object *read (gfun_t gfun) {
object *item = nextitem(gfun);
if (item == (object *)KET) error(PSTR("Incomplete list"));
if (item == (object *)BRA) return readrest(gfun);
if (item == (object *)DOT) return read(gfun);
if (item == (object *)QUO) return cons(symbol(QUOTE), cons(read(gfun), NULL));
return item;
}
// Setup
void initenv () {
GlobalEnv = NULL;
tee = symbol(TEE);
}
void setup () {
Serial.begin(9600);
while (!Serial);
initworkspace();
initenv();
initsleep();
pfstring(PSTR("uLisp 2.5 "), pserial); pln(pserial);
}
// Read/Evaluate/Print loop
void repl (object *env) {
for (;;) {
randomSeed(micros());
gc(NULL, env);
#if defined (printfreespace)
pint(Freespace, pserial);
#endif
if (BreakLevel) {
pfstring(PSTR(" : "), pserial);
pint(BreakLevel, pserial);
}
pfstring(PSTR("> "), pserial);
object *line = read(gserial);
if (BreakLevel && line == nil) { pln(pserial); return; }
if (line == (object *)KET) error(PSTR("Unmatched right bracket"));
push(line, GCStack);
pfl(pserial);
line = eval(line, env);
pfl(pserial);
printobject(line, pserial);
pop(GCStack);
pfl(pserial);
pln(pserial);
}
}
void loop () {
End = 0xA5; // Canary to check stack
if (!setjmp(exception)) {
#if defined(resetautorun)
volatile int autorun = 12; // Fudge to keep code size the same
#else
volatile int autorun = 13;
#endif
if (autorun == 12) autorunimage();
}
// Come here after error
delay(100); while (Serial.available()) Serial.read();
for (int i=0; i<TRACEMAX; i++) TraceDepth[i] = 0;
#if defined(sdcardsupport)
SDpfile.close(); SDgfile.close();
#endif
#if defined(lisplibrary)
if (!tstflag(LIBRARYLOADED)) { setflag(LIBRARYLOADED); loadfromlibrary(NULL); }
#endif
repl(NULL);
}
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