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annotate libs/assimp/LineSplitter.h @ 0:b2f14e535253

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author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 01 Feb 2014 19:58:19 +0200
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nuclear@0 1 /*
nuclear@0 2 Open Asset Import Library (assimp)
nuclear@0 3 ----------------------------------------------------------------------
nuclear@0 4
nuclear@0 5 Copyright (c) 2006-2012, assimp team
nuclear@0 6 All rights reserved.
nuclear@0 7
nuclear@0 8 Redistribution and use of this software in source and binary forms,
nuclear@0 9 with or without modification, are permitted provided that the
nuclear@0 10 following conditions are met:
nuclear@0 11
nuclear@0 12 * Redistributions of source code must retain the above
nuclear@0 13 copyright notice, this list of conditions and the
nuclear@0 14 following disclaimer.
nuclear@0 15
nuclear@0 16 * Redistributions in binary form must reproduce the above
nuclear@0 17 copyright notice, this list of conditions and the
nuclear@0 18 following disclaimer in the documentation and/or other
nuclear@0 19 materials provided with the distribution.
nuclear@0 20
nuclear@0 21 * Neither the name of the assimp team, nor the names of its
nuclear@0 22 contributors may be used to endorse or promote products
nuclear@0 23 derived from this software without specific prior
nuclear@0 24 written permission of the assimp team.
nuclear@0 25
nuclear@0 26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
nuclear@0 27 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
nuclear@0 28 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
nuclear@0 29 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
nuclear@0 30 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
nuclear@0 31 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
nuclear@0 32 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
nuclear@0 33 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
nuclear@0 34 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
nuclear@0 35 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
nuclear@0 36 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
nuclear@0 37
nuclear@0 38 ----------------------------------------------------------------------
nuclear@0 39 */
nuclear@0 40
nuclear@0 41 /** @file LineSplitter.h
nuclear@0 42 * @brief LineSplitter, a helper class to iterate through all lines
nuclear@0 43 * of a file easily. Works with StreamReader.
nuclear@0 44 */
nuclear@0 45 #ifndef INCLUDED_LINE_SPLITTER_H
nuclear@0 46 #define INCLUDED_LINE_SPLITTER_H
nuclear@0 47
nuclear@0 48 #include <stdexcept>
nuclear@0 49
nuclear@0 50 #include "StreamReader.h"
nuclear@0 51 #include "ParsingUtils.h"
nuclear@0 52
nuclear@0 53 namespace Assimp {
nuclear@0 54
nuclear@0 55 // ------------------------------------------------------------------------------------------------
nuclear@0 56 /** Usage:
nuclear@0 57 @code
nuclear@0 58 for(LineSplitter splitter(stream);splitter;++splitter) {
nuclear@0 59
nuclear@0 60 if (*splitter == "hi!") {
nuclear@0 61 ...
nuclear@0 62 }
nuclear@0 63 else if (splitter->substr(0,5) == "hello") {
nuclear@0 64 ...
nuclear@0 65 // access the third token in the line (tokens are space-separated)
nuclear@0 66 if (strtol(splitter[2]) > 5) { .. }
nuclear@0 67 }
nuclear@0 68
nuclear@0 69 std::cout << "Current line is: " << splitter.get_index() << std::endl;
nuclear@0 70 }
nuclear@0 71 @endcode */
nuclear@0 72 // ------------------------------------------------------------------------------------------------
nuclear@0 73 class LineSplitter
nuclear@0 74 {
nuclear@0 75 public:
nuclear@0 76
nuclear@0 77 typedef size_t line_idx;
nuclear@0 78
nuclear@0 79 public:
nuclear@0 80
nuclear@0 81 // -----------------------------------------
nuclear@0 82 /** construct from existing stream reader
nuclear@0 83 note: trim is *always* assumed true if skyp_empty_lines==true
nuclear@0 84 */
nuclear@0 85 LineSplitter(StreamReaderLE& stream, bool skip_empty_lines = true, bool trim = true)
nuclear@0 86 : stream(stream)
nuclear@0 87 , swallow()
nuclear@0 88 , skip_empty_lines(skip_empty_lines)
nuclear@0 89 , trim(trim)
nuclear@0 90 {
nuclear@0 91 cur.reserve(1024);
nuclear@0 92 operator++();
nuclear@0 93
nuclear@0 94 idx = 0;
nuclear@0 95 }
nuclear@0 96
nuclear@0 97 public:
nuclear@0 98
nuclear@0 99 // -----------------------------------------
nuclear@0 100 /** pseudo-iterator increment */
nuclear@0 101 LineSplitter& operator++() {
nuclear@0 102 if(swallow) {
nuclear@0 103 swallow = false;
nuclear@0 104 return *this;
nuclear@0 105 }
nuclear@0 106
nuclear@0 107 if (!*this) {
nuclear@0 108 throw std::logic_error("End of file, no more lines to be retrieved.");
nuclear@0 109 }
nuclear@0 110
nuclear@0 111 char s;
nuclear@0 112
nuclear@0 113 cur.clear();
nuclear@0 114 while(stream.GetRemainingSize() && (s = stream.GetI1(),1)) {
nuclear@0 115 if (s == '\n' || s == '\r') {
nuclear@0 116 if (skip_empty_lines) {
nuclear@0 117 while (stream.GetRemainingSize() && ((s = stream.GetI1()) == ' ' || s == '\r' || s == '\n'));
nuclear@0 118 if (stream.GetRemainingSize()) {
nuclear@0 119 stream.IncPtr(-1);
nuclear@0 120 }
nuclear@0 121 }
nuclear@0 122 else {
nuclear@0 123 // skip both potential line terminators but don't read past this line.
nuclear@0 124 if (stream.GetRemainingSize() && (s == '\r' && stream.GetI1() != '\n')) {
nuclear@0 125 stream.IncPtr(-1);
nuclear@0 126 }
nuclear@0 127
nuclear@0 128 if (trim) {
nuclear@0 129 while (stream.GetRemainingSize() && ((s = stream.GetI1()) == ' ' || s == '\t'));
nuclear@0 130 if (stream.GetRemainingSize()) {
nuclear@0 131 stream.IncPtr(-1);
nuclear@0 132 }
nuclear@0 133 }
nuclear@0 134 }
nuclear@0 135
nuclear@0 136 break;
nuclear@0 137 }
nuclear@0 138 cur += s;
nuclear@0 139 }
nuclear@0 140
nuclear@0 141 ++idx;
nuclear@0 142 return *this;
nuclear@0 143 }
nuclear@0 144
nuclear@0 145 // -----------------------------------------
nuclear@0 146 LineSplitter& operator++(int) {
nuclear@0 147 return ++(*this);
nuclear@0 148 }
nuclear@0 149
nuclear@0 150 // -----------------------------------------
nuclear@0 151 /** get a pointer to the beginning of a particular token */
nuclear@0 152 const char* operator[] (size_t idx) const {
nuclear@0 153 const char* s = operator->()->c_str();
nuclear@0 154
nuclear@0 155 SkipSpaces(&s);
nuclear@0 156 for(size_t i = 0; i < idx; ++i) {
nuclear@0 157
nuclear@0 158 for(;!IsSpace(*s); ++s) {
nuclear@0 159 if(IsLineEnd(*s)) {
nuclear@0 160 throw std::range_error("Token index out of range, EOL reached");
nuclear@0 161 }
nuclear@0 162 }
nuclear@0 163 SkipSpaces(&s);
nuclear@0 164 }
nuclear@0 165 return s;
nuclear@0 166 }
nuclear@0 167
nuclear@0 168 // -----------------------------------------
nuclear@0 169 /** extract the start positions of N tokens from the current line*/
nuclear@0 170 template <size_t N>
nuclear@0 171 void get_tokens(const char* (&tokens)[N]) const {
nuclear@0 172 const char* s = operator->()->c_str();
nuclear@0 173
nuclear@0 174 SkipSpaces(&s);
nuclear@0 175 for(size_t i = 0; i < N; ++i) {
nuclear@0 176 if(IsLineEnd(*s)) {
nuclear@0 177 throw std::range_error("Token count out of range, EOL reached");
nuclear@0 178 }
nuclear@0 179 tokens[i] = s;
nuclear@0 180
nuclear@0 181 for(;*s && !IsSpace(*s); ++s);
nuclear@0 182 SkipSpaces(&s);
nuclear@0 183 }
nuclear@0 184 }
nuclear@0 185
nuclear@0 186 // -----------------------------------------
nuclear@0 187 /** member access */
nuclear@0 188 const std::string* operator -> () const {
nuclear@0 189 return &cur;
nuclear@0 190 }
nuclear@0 191
nuclear@0 192 std::string operator* () const {
nuclear@0 193 return cur;
nuclear@0 194 }
nuclear@0 195
nuclear@0 196 // -----------------------------------------
nuclear@0 197 /** boolean context */
nuclear@0 198 operator bool() const {
nuclear@0 199 return stream.GetRemainingSize()>0;
nuclear@0 200 }
nuclear@0 201
nuclear@0 202 // -----------------------------------------
nuclear@0 203 /** line indices are zero-based, empty lines are included */
nuclear@0 204 operator line_idx() const {
nuclear@0 205 return idx;
nuclear@0 206 }
nuclear@0 207
nuclear@0 208 line_idx get_index() const {
nuclear@0 209 return idx;
nuclear@0 210 }
nuclear@0 211
nuclear@0 212 // -----------------------------------------
nuclear@0 213 /** access the underlying stream object */
nuclear@0 214 StreamReaderLE& get_stream() {
nuclear@0 215 return stream;
nuclear@0 216 }
nuclear@0 217
nuclear@0 218 // -----------------------------------------
nuclear@0 219 /** !strcmp((*this)->substr(0,strlen(check)),check) */
nuclear@0 220 bool match_start(const char* check) {
nuclear@0 221 const size_t len = strlen(check);
nuclear@0 222
nuclear@0 223 return len <= cur.length() && std::equal(check,check+len,cur.begin());
nuclear@0 224 }
nuclear@0 225
nuclear@0 226
nuclear@0 227 // -----------------------------------------
nuclear@0 228 /** swallow the next call to ++, return the previous value. */
nuclear@0 229 void swallow_next_increment() {
nuclear@0 230 swallow = true;
nuclear@0 231 }
nuclear@0 232
nuclear@0 233 private:
nuclear@0 234
nuclear@0 235 line_idx idx;
nuclear@0 236 std::string cur;
nuclear@0 237 StreamReaderLE& stream;
nuclear@0 238 bool swallow, skip_empty_lines, trim;
nuclear@0 239 };
nuclear@0 240
nuclear@0 241 }
nuclear@0 242 #endif // INCLUDED_LINE_SPLITTER_H