1 /************************************************************************************[ParseUtils.h]
2 Copyright (c) 2003-2006, Niklas Een, Niklas Sorensson
3 Copyright (c) 2007-2010, Niklas Sorensson
4
5 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
6 associated documentation files (the "Software"), to deal in the Software without restriction,
7 including without limitation the rights to use, copy, modify, merge, publish, distribute,
8 sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
9 furnished to do so, subject to the following conditions:
10
11 The above copyright notice and this permission notice shall be included in all copies or
12 substantial portions of the Software.
13
14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
15 NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
16 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
17 DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
18 OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
19 **************************************************************************************************/
20
21 #ifndef Minisat_ParseUtils_h
22 #define Minisat_ParseUtils_h
23
24 #include <stdlib.h>
25 #include <stdio.h>
26
27 #include <zlib.h>
28
29 #include "minisat/mtl/XAlloc.h"
30
31 namespace Minisat {
32
33 //-------------------------------------------------------------------------------------------------
34 // A simple buffered character stream class:
35
36
37
38 class StreamBuffer {
39 gzFile in;
40 unsigned char* buf;
41 int pos;
42 int size;
43
44 enum { buffer_size = 64*1024 };
45
assureLookahead()46 void assureLookahead() {
47 if (pos >= size) {
48 pos = 0;
49 size = gzread(in, buf, buffer_size); } }
50
51 public:
StreamBuffer(gzFile i)52 explicit StreamBuffer(gzFile i) : in(i), pos(0), size(0){
53 buf = (unsigned char*)xrealloc(NULL, buffer_size);
54 assureLookahead();
55 }
~StreamBuffer()56 ~StreamBuffer() { free(buf); }
57
58 int operator * () const { return (pos >= size) ? EOF : buf[pos]; }
59 void operator ++ () { pos++; assureLookahead(); }
position()60 int position () const { return pos; }
61 };
62
63
64 //-------------------------------------------------------------------------------------------------
65 // End-of-file detection functions for StreamBuffer and char*:
66
67
isEof(StreamBuffer & in)68 static inline bool isEof(StreamBuffer& in) { return *in == EOF; }
isEof(const char * in)69 static inline bool isEof(const char* in) { return *in == '\0'; }
70
71 //-------------------------------------------------------------------------------------------------
72 // Generic parse functions parametrized over the input-stream type.
73
74
75 template<class B>
skipWhitespace(B & in)76 static void skipWhitespace(B& in) {
77 while ((*in >= 9 && *in <= 13) || *in == 32)
78 ++in; }
79
80
81 template<class B>
skipLine(B & in)82 static void skipLine(B& in) {
83 for (;;){
84 if (isEof(in)) return;
85 if (*in == '\n') { ++in; return; }
86 ++in; } }
87
88
89 template<class B>
parseInt(B & in)90 static int parseInt(B& in) {
91 int val = 0;
92 bool neg = false;
93 skipWhitespace(in);
94 if (*in == '-') neg = true, ++in;
95 else if (*in == '+') ++in;
96 if (*in < '0' || *in > '9') fprintf(stderr, "PARSE ERROR! Unexpected char: %c\n", *in), exit(3);
97 while (*in >= '0' && *in <= '9')
98 val = val*10 + (*in - '0'),
99 ++in;
100 return neg ? -val : val; }
101
102
103 // String matching: in case of a match the input iterator will be advanced the corresponding
104 // number of characters.
105 template<class B>
match(B & in,const char * str)106 static bool match(B& in, const char* str) {
107 int i;
108 for (i = 0; str[i] != '\0'; i++)
109 if (in[i] != str[i])
110 return false;
111
112 in += i;
113
114 return true;
115 }
116
117 // String matching: consumes characters eagerly, but does not require random access iterator.
118 template<class B>
eagerMatch(B & in,const char * str)119 static bool eagerMatch(B& in, const char* str) {
120 for (; *str != '\0'; ++str, ++in)
121 if (*str != *in)
122 return false;
123 return true; }
124
125
126 //=================================================================================================
127 }
128
129 #endif
130