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119 lines
3.8 KiB
C++
119 lines
3.8 KiB
C++
/************************************************************************************[ParseUtils.h]
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Copyright (c) 2003-2006, Niklas Een, Niklas Sorensson
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Copyright (c) 2007-2010, Niklas Sorensson
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
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associated documentation files (the "Software"), to deal in the Software without restriction,
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including without limitation the rights to use, copy, modify, merge, publish, distribute,
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sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or
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substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
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NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
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OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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**************************************************************************************************/
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#ifndef Minisat_ParseUtils_h
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#define Minisat_ParseUtils_h
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#include <stdlib.h>
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#include <stdio.h>
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#include "XAlloc.h"
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namespace Minisat {
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//-------------------------------------------------------------------------------------------------
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// A simple buffered character stream class:
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class StreamBuffer {
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unsigned char* buf;
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int pos;
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int size;
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enum { buffer_size = 64*1024 };
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virtual void assureLookahead() = 0;
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public:
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virtual ~StreamBuffer() { }
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int operator * () const { return (pos >= size) ? EOF : buf[pos]; }
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void operator ++ () { pos++; assureLookahead(); }
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int position () const { return pos; }
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};
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//-------------------------------------------------------------------------------------------------
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// End-of-file detection functions for StreamBuffer and char*:
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static inline bool isEof(StreamBuffer& in) { return *in == EOF; }
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static inline bool isEof(const char* in) { return *in == '\0'; }
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//-------------------------------------------------------------------------------------------------
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// Generic parse functions parametrized over the input-stream type.
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template<class B>
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static void skipWhitespace(B& in) {
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while ((*in >= 9 && *in <= 13) || *in == 32)
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++in; }
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template<class B>
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static void skipLine(B& in) {
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for (;;){
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if (isEof(in)) return;
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if (*in == '\n') { ++in; return; }
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++in; } }
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template<class B>
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static int parseInt(B& in) {
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int val = 0;
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bool neg = false;
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skipWhitespace(in);
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if (*in == '-') neg = true, ++in;
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else if (*in == '+') ++in;
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if (*in < '0' || *in > '9') fprintf(stderr, "PARSE ERROR! Unexpected char: %c\n", *in), exit(3);
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while (*in >= '0' && *in <= '9')
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val = val*10 + (*in - '0'),
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++in;
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return neg ? -val : val; }
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// String matching: in case of a match the input iterator will be advanced the corresponding
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// number of characters.
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template<class B>
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static bool match(B& in, const char* str) {
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int i;
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for (i = 0; str[i] != '\0'; i++)
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if (in[i] != str[i])
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return false;
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in += i;
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return true;
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}
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// String matching: consumes characters eagerly, but does not require random access iterator.
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template<class B>
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static bool eagerMatch(B& in, const char* str) {
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for (; *str != '\0'; ++str, ++in)
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if (*str != *in)
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return false;
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return true; }
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//=================================================================================================
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}
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#endif
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