starting a flags parser

This commit is contained in:
Kyle Isom 2023-10-13 04:24:32 -07:00
parent c2e83613f2
commit 3cefb59310
4 changed files with 327 additions and 5 deletions

191
Flag.cc Normal file
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@ -0,0 +1,191 @@
///
/// \file Flag.h
/// \author kyle
/// \created 2023-10-12
/// \brief Flag defines a command-line flag parser.
///
/// \section COPYRIGHT
///
/// Copyright 2023 K. Isom <kyle@imap.cc>
///
/// Permission to use, copy, modify, and/or distribute this software for
/// any purpose with or without fee is hereby granted, provided that
/// the above copyright notice and this permission notice appear in all /// copies.
///
/// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
/// WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
/// WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
/// AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
/// DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA
/// OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
/// TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
/// PERFORMANCE OF THIS SOFTWARE.
///
#include <cstdint>
#include <functional>
#include <map>
#include <regex>
#include <vector>
#include "Flag.h"
namespace klib {
static const std::regex isFlag("^-[a-zA-Z0-9]+$",
std::regex_constants::nosubs);
Flag::Flag(FlagType fType, std::string fName, std::string fDescription)
: Type(fType), WasSet(false), Name(fName), Description(fDescription)
{
}
Flags::Flags(std::string fName)
: name(fName), description("")
{
}
Flags::Flags(std::string fName, std::string fDescription)
: name(fName), description(fDescription)
{
}
bool
Flags::Register(std::string fName, FlagType fType, std::string fDescription)
{
if (!std::regex_search(fName, isFlag)) {
return false;
}
if (this->flags.count(fName) != 0) {
return false;
}
auto flag = new Flag;
flag->Type = fType;
flag->WasSet = false;
flag->name = name;
this->desription = fDescription;
this->flags[fName] = flag;
return true;
}
Flag *
Flags::Lookup(std::string fName)
{
if (this->flags.count(fName) == 0) {
return nullptr;
}
}
OptFlagValue
Flags::ValueOf(std::string fName)
{
if (this->flags.count(fName)) {
return std::nullopt;
}
return OptFlagValue(this->flags[fName]->Value);
}
ParseStatus
Flags::parseArg(int argc, char **argv, int &index)
{
std::string arg(argv[index]);
index++;
if (!std::regex_search(arg, isFlag)) {
return ParseStatus::EndOfFlags;
}
if (this->flags.count(arg) == 0) {
return ParseStatus::NotRegistered;
}
auto flag = flags[arg];
if (flag->Type == FlagType::Boolean) {
flag->WasSet = true;
flag->Value.b = true;
return ParseStatus::OK;
}
switch (flag->Type) {
default:
throw std::runtime_error("not handled");
}
return ParseStatus::OK;
}
ParseStatus
Flags::Parse(int argc, char **argv)
{
int index = 1;
while (index != argc) {
auto result = this->parseArg(argc, argv, index);
switch (result) {
case ParseStatus::OK:
continue;
case ParseStatus::EndOfFlags:
while (index < argc) {
this->args.push_back(std::string(argv[index]));
index++;
}
continue;
case ParseStatus::EndOfFlags:
case ParseStatus::NotEnoughArgs:
// fall through //
return result;
default:
throw runtime_error("unhandled parse state");
}
}
return ParseStatus::OK;
}
size_t
Flags::NumArgs()
{
return this->args.size();
}
std::vector<std::string>
Flags::Args()
{
return this->args;
}
bool
Flags::GetBool(std::string name, bool &flagValue)
{
if (this->flags[name] == 0) {
return false;
}
return std::get<bool>(this->flags[name]->Value);
}
} // namespace klib

111
Flag.h Normal file
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@ -0,0 +1,111 @@
///
/// \file Flag.h
/// \author kyle
/// \created 2023-10-12
/// \brief Flag declares a command-line flag parser.
///
/// \section COPYRIGHT
///
/// Copyright 2023 K. Isom <kyle@imap.cc>
///
/// Permission to use, copy, modify, and/or distribute this software for
/// any purpose with or without fee is hereby granted, provided that
/// the above copyright notice and this permission notice appear in all /// copies.
///
/// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
/// WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
/// WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
/// AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
/// DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA
/// OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
/// TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
/// PERFORMANCE OF THIS SOFTWARE.
///
#include <cstdint>
#include <functional>
#include <map>
#include <optional>
#include <variant>
#include <vector>
namespace klib {
enum class FlagType : uint8_t {
Unknown = 0,
Boolean = 1,
Integer = 2,
UnsignedInteger = 3,
String = 4,
};
enum class ParseStatus : uint8_t {
OK = 0,
EndOfFlags = 1,
NotRegistered = 2,
NotEnoughArgs = 3,
};
typedef std::variant<
std::string *,
bool *,
int64_t *,
uint64_t *> FlagValue;
struct Flag {
Flag(FlagType fType, std::string fName, std::string fDescription);
FlagType Type;
bool WasSet;
std::string Name;
std::string Description;
FlagValue Value;
};
typedef std::optional<FlagValue> OptFlagValue;
class Flags {
public:
Flags(std::string fName);
Flags(std::string fName, std::string fDescription);
bool Register(std::string fName,
FlagType fType,
std::string fDescription);
Flag *Lookup(std::string fName);
OptFlagValue
ValueOf(std::string fName);
int Parse(int argc, char **argv);
void Usage(std::ostream &os, int exitCode);
size_t NumArgs();
std::vector<std::string> Args();
std::string Arg(int index);
bool GetBool(std::string name, bool &flagValue);
// bool GetUnsignedInteger(std::string name, uint64_t &flagValue)
// bool GetInteger(std::string name, int64_t &flagValue)
// bool GetString(std::string name, std::string &flagValue)
private:
ParseStatus parseArg(int argc, char **argv, int &index);
std::string name;
std::string description;
std::vector<std::string> args;
std::map<std::string, Flag *> flags;
};
} // namespace klib

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@ -6,7 +6,7 @@ LDFLAGS :=
SOURCE_DIR ?= "/mnt/Kyle/Documents/Fonts/Equity + Concourse Standard + Triplicate"
TARGET_DIR ?= "$(HOME)/.local/share/fonts"
SOURCES := rcpp.cc
SOURCES := rcpp.cc Flag.cc Flag.h
OBJS := $(patsubst %.cc,%.o,$(filter %.cc,$(SOURCES)))
TARGET := rcpp

28
rcpp.cc
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@ -29,6 +29,9 @@
#include <iostream>
#include <regex>
#include "Flag.h"
using namespace klib;
#define ALIAS_FS namespace fs = std::filesystem
typedef std::filesystem::path Path;
@ -147,13 +150,30 @@ main(int argc, char *argv[])
ALIAS_FS;
auto regexOptions = std::regex_constants::optimize;
if (argc < 4) {
std::cerr << "Usage: rcpp pattern files... destination\n";
Flags optArgs("rcpp", "recursively copy files by pattern");
optArgs.Register("-e", FlagType::Boolean, "pattern is a file extension");
optArgs.Register("-i", FlagType::Boolean, "case-insensitive maches");
if (optArgs.Parse(argc, argv)) {
optArgs.Usage(std::cerr, 1);
}
auto pattern = std::string(argv[1]);
auto destDir = fs::absolute(fs::path(argv[argc-1]));
if (optArgs.NumArgs() < 3) {
optArgs.Usage(std::cerr, 1);
}
auto pattern = optArgs.Arg(0);
auto destDir = fs::path(optArgs.Arg(optArgs.NumArgs() - 1));
bool value;
if (optArgs.GetBool("-e", value) && value) {
pattern = "\\." + pattern + "$";
}
if (optArgs.GetBool("-i", value) && value) {
regexOptions |= std::regex_constants::icase;
}
destDir = fs::absolute(destDir);
TRACE << "argc: " << argc << "\n";