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/*
* scan.h: A plugin for the Video Disk Recorder
*
* See the README file for copyright information and how to reach the author.
* (c) 2007-2013 Jörg Wendel
*
* This code is distributed under the terms and conditions of the
* GNU GENERAL PUBLIC LICENSE. See the file COPYING for details.
*
*/
//***************************************************************************
// Includes
//***************************************************************************
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <common.h>
//***************************************************************************
// Token Scanner
//***************************************************************************
class Scan
{
public:
Scan(const char* buf, int np = yes) { asprintf(&buffer, "%s", buf); reset(); allowNumPrefix = np; }
~Scan() { free(buffer); }
void reset() { p = buffer; isStr = no; }
const char* all() { return buffer; }
const char* lastString() { return _last; }
const char* lastIdent() { return _last; }
int lastInt() { return atoi(_last); }
int isEmpty() { return _last[0] == 0; }
int isString() { return isStr; }
int isIdent() { return !isStr && isIdent(*_last); }
int isNum() { return !isStr && isNum(*_last); }
int isLogical() { return !isStr && isLogical(*_last); }
int isOperator() { return !isStr && isOperator(*_last); }
int hasValue(const char* v) { return strcmp(Str::notNull(v), Str::notNull(_last)) == 0; }
const char* next() { return p; }
int eat(int aANP = na);
private:
void skipWs() { while (*p && isWhiteSpace(*p)) p++; }
int isDelimiter(char c) { return strchr(delimiters, c) != 0; }
int isWhiteSpace(char c) { return strchr(whitespace, c) != 0; }
int isIdent(char c) { return isalpha(c); }
int isNum(char c) { return isdigit(c) || isNumPrefix(c); }
int isOperator(char c) { return strchr(operators, c) != 0; }
int isLogical(char c) { return strchr(logicalOps, c) != 0; }
int isNumPrefix(char c) { return strchr(numprefix, c) != 0; }
// data
int isStr;
const char* p;
char* buffer;
char _last[1000+TB];
int allowNumPrefix;
static const char* delimiters;
static const char* operators;
static const char* logicalOps;
static const char* whitespace;
static const char* numprefix;
};
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