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annotate src/basic/SourceManager.d @ 206:d3c148ca429b

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Major moving of files. all src now goes into src, all docs in docs.
author Anders Johnsen <skabet@gmail.com>
date Tue, 12 Aug 2008 18:14:56 +0200
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206
d3c148ca429b Major moving of files. all src now goes into src, all docs in docs.
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1 module basic.SourceManager;
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2
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3 import tango.core.Memory : GC;
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4 import tango.io.UnicodeFile;
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5 import tango.io.Stdout;
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6 import tango.text.convert.Layout;
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7
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8 public import basic.SourceLocation;
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9
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10 private alias char[] string;
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11
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12 /**
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13 SourceManager is used to handle input files, by loading them in in chunks
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14 that can be referenced elsewhere.
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15
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16 It will also help extract the line/col of locations and convert between
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17 real and virtual locations
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18 **/
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19 class SourceManager
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20 {
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21 this()
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22 {
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23 layout = new Layout!(char);
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24 }
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25
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26 /**
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27 Will load in the file belonging to the filename
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28
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29 filename = The file to load. Theres some assumptions about this file.
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30 1. The file has a BOM or is valid utf-8
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31 2. The file is not empty, unreadable, a folder etc.
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32 **/
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33 SourceLocation addFile(string filename)
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34 {
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35 scope file = new UnicodeFile!(char)(filename, Encoding.UTF_8);
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36 auto file_data = file.read();
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37 return createCheckpoints(file_data, filename);
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38 }
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39
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40 /**
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41 Returns a string slice containing the part of the file after loc (a
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42 pointer might be better, it allows negative indexing)
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43 **/
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44 string getRawData(SourceLocation loc)
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45 {
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46 CP cp = checkpoints[loc.fileID];
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47 auto length = cp.data_end - cp.data.ptr;
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48 return cp.data.ptr[loc.fileOffset .. length];
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49 }
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50
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51 /**
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52 Extracts the line number of the given location
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53 O("file size") if cache isn't built, O(log "lines in file") else
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54 **/
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55 uint getLineNumber(SourceLocation loc)
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56 {
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57 assert(loc.isValid, "Location is invalid");
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58 assert(loc.isReal, "Virtual locations not supported yet");
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59 assert(loc.fileID < checkpoints.length, "Non-existent location");
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60
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61 CP* cp = &checkpoints[loc.fileID];
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62 auto cache = &linecache[cp.meta_index];
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63 if (!cache.isCached)
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64 cache.build(cp.data_start[0 .. cp.data_end - cp.data_start]);
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65 return cache.lineOf(getFileOffset(loc));
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66 }
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67
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68 /**
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69 Extracts the full byte offset into a file, at which a location
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70 is pointing.
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71 **/
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72 uint getFileOffset(SourceLocation loc)
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73 {
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74 return loc.fileOffset
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75 + checkpoints[loc.fileID].part * loc.Bits.MaxFileOffset;
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76 }
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77
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78 /**
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79 Extracts a string containing the entire line loc appears in.
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80 **/
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81 string getLine(SourceLocation loc)
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82 {
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83 // The line is extracted by getting two pointers to the exact location
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84 // and decreasing one until the nearest newline while the other ptr is
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85 // increased to the nearest newline.
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86 CP* cp = &checkpoints[loc.fileID];
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87 char* ptr = cp.data.ptr + loc.fileOffset;
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88 char* ptr_lo = ptr;
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89 while (cp.inRange(ptr_lo) && *ptr_lo != '\n' && *ptr_lo != '\r')
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90 --ptr_lo;
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91 while (cp.inRange(ptr) && *ptr != '\n' && *ptr != '\r')
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92 ++ptr;
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93 return ptr_lo[1 .. ptr - ptr_lo];
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94 }
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95
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96 /**
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97 Gets the column of where the loc appears.
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98 **/
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99 int getColumn(SourceLocation loc)
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100 {
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101 // Use same approach as getLine
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102
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103 CP* cp = &checkpoints[loc.fileID];
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104 char* ptr = cp.data.ptr + loc.fileOffset;
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105 char* ptr_lo = ptr;
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106 while (cp.inRange(ptr_lo) && *ptr_lo != '\n' && *ptr_lo != '\r')
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107 --ptr_lo;
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108 return cast(int)ptr - cast(int)ptr_lo - 1;
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109 }
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110
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111 /**
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112 Get the original source text of a SourceRange
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113 **/
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114 string getText(SourceRange loc)
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115 {
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116 assert(loc.isValid, "Range is invalid");
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117 assert(loc.isReal, "Virtual locations not supported yet");
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118 auto begin = getFileOffset(loc.begin);
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119 auto end = getFileOffset(loc.end);
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120 return checkpoints[loc.begin.fileID].data_start[begin .. end];
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121 }
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122
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123 /**
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124 Get the original source text
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125 **/
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126 string getText(SourceLocation loc, size_t length)
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127 {
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128 return getText(SourceRange(loc, loc + length));
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129 }
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130
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131 /**
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132 Convert a location into a string. Something like "file(line)"
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133 **/
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134 string getLocationAsString(SourceLocation loc)
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135 {
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136 assert(loc.isValid, "Location is invalid");
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137 return layout.convert("{}({})",
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138 checkpoints[loc.fileID].filename,
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139 getLineNumber(loc));
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140 }
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141 string getLocationAsString(SourceRange loc)
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142 {
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143 return layout.convert("{}({}:{})",
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144 checkpoints[loc.begin.fileID].filename,
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145 getFileOffset(loc.begin),
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146 getFileOffset(loc.end));
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147 }
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148
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149 /**
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150 Get the file name of a loc.
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151 **/
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152 string getFile(SourceLocation loc)
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153 {
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154 return checkpoints[loc.fileID].filename;
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155 }
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156
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157 private:
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158 synchronized
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159 SourceLocation createCheckpoints(string data, string source_file)
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160 {
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161 // The line-cache is added, but not built,
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162 // getLineNumber makes sure it is called when needed.
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163 linecache ~= FileLineCache();
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164 uint meta_index = linecache.length - 1;
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165
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166 // SourceLocation's can only index relatively short buffers, therefore
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167 // the file is split into several checkpoints.
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168 uint checkpoint_counter = 0;
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169 char* data_start = data.ptr;
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170 char* data_end = data.ptr + data.length;
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171 while (data.length > 0)
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172 {
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173 uint to_take = min(data.length, SourceLocation.Bits.MaxFileOffset);
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174 checkpoints ~=
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175 CP(source_file,
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176 data_start,
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177 data_end,
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178 data[0 .. to_take],
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179 checkpoint_counter++,
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180 meta_index);
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181 data = data[to_take .. $];
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182 }
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183 checkpoint_counter = checkpoints.length - checkpoint_counter;
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184 return SourceLocation.fromFileID(checkpoint_counter);
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185 }
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186
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187 /// Contains the read/generated data.
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188 CP[] checkpoints;
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189 /// Cache used to speed up finding of line-starts.
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190 FileLineCache[] linecache;
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191 /// Used for formatting locations as strings.
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192 Layout!(char) layout;
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193
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194 // These really should be magically available everywhere and templated.
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195 int min(int a, int b) { return a < b? a : b; }
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196 int max(int a, int b) { return a >= b? a : b; }
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197
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198 // A Check Point is used to store a file in multiple parts, to overcome
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199 // the limitation of SourceLocation only having a rather limited amount of
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200 // bits to index any one file.
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201 struct CP
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202 {
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203 // read-only
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204 char[] filename;
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205 // ditto
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206 char* data_start;
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207 char* data_end;
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208 // ditto
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209 char[] data;
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210 // ditto
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211 uint part = 0;
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212 // ditto
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213 uint meta_index = 0;
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214
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215 bool inRange(char* p)
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216 {
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217 return p >= data_start && p < data_end;
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218 }
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219 }
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220
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221 struct FileLineCache
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222 {
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223 /// Contains the offset of the i'th line on index i
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224 uint[] line_starts;
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225
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226 /// Indicates weather the cache has been built or not
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227 bool isCached = false;
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228
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229 /**
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230 This method does a binary search to find the line that contains the
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231 given offset.
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232 **/
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233 uint lineOf(uint offset)
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234 {
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235 size_t beg = 0,
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236 end = line_starts.length,
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237 mid = end >> 1;
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238
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239 while( beg < end )
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240 {
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241 if( line_starts[mid] <= offset )
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242 beg = mid + 1;
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243 else
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244 end = mid;
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245 mid = beg + ( end - beg ) / 2;
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246 }
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247 return mid;
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248 }
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249
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250 /**
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251 Builds the cache data - always make sure this has been called before
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252 calling lineOf.
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253 **/
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254 void build(char[] data)
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255 {
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256 // j starts at 1, because we need an additional place in the array
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257 // to indicate that line 1 starts at index 0.
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258 size_t j = 1;
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259 char* it = data.ptr, end = data.ptr + data.length;
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260 for (; it != end; ++it)
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261 if (*it == '\n')
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262 ++j;
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263 // Allocate without initialization. Saves a bit of time
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264 line_starts.length = j;
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265 line_starts[0] = 0;
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266
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267 // Go over the data again, writing the line starts in our new array
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268 j = 1;
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269 for (size_t i = 0; i < data.length; i++)
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270 {
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271 if (data[i] == '\n')
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272 line_starts[j++] = i;
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273 else if (data[i] == '\r')
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274 {
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275 line_starts[j++] = i;
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276 i += cast(size_t)(data[i+1] == '\n');
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277 }
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278 }
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279
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280 isCached = true;
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281 }
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282 }
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283 }
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284