sandbox/parser.cc

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#include "defs.h"
#include "parser.h"
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#include <string.h>
static void
reset(struct Token *t)
{
t->token = nullptr;
t->length = 0;
}
bool
match_token(const char *a, const size_t alen,
const char *b, const size_t blen)
{
if (alen != blen) {
return false;
}
return memcmp(a, b, alen) == 0;
}
PARSE_RESULT
parse_next(const char *buf, const size_t length, size_t *offset,
struct Token *token)
{
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size_t cursor = *offset;
// Clear the token.
reset(token);
if (cursor == length) {
return PARSE_EOB;
}
while (cursor <= length) {
if (buf[cursor] != ' ') {
if (buf[cursor] != '\t') {
break;
}
}
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cursor++;
}
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if (cursor == length) {
return PARSE_EOB;
}
token->token = (char *)buf + cursor;
while ((token->length <= MAX_TOKEN_LENGTH) && (cursor < length)) {
if (buf[cursor] != ' ') {
if (buf[cursor] != '\t') {
cursor++;
token->length++;
continue;
}
}
cursor++;
break;
}
if (token->length > MAX_TOKEN_LENGTH) {
reset(token);
return PARSE_LEN;
}
*offset = cursor;
return PARSE_OK;
}