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annotate src/basic/SourceLocation.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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children e0551773a005
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206
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1 module basic.SourceLocation;
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2
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3 /// Shorter alias for SourceLocation
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4 public alias SourceLocation SLoc;
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5
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6 /// SourceLocation points to a place in some buffer
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7 struct SourceLocation
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8 {
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9 /// Returns true, if the location is from a real file
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10 bool isReal() { return (val & 0x80_00_00_00) == 0; }
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11 /// Returns true, if the location is not from a real file
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12 bool isVirtual() { return (val & 0x80_00_00_00) != 0; }
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13
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14 /// Check if this location is invalid or not
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15 bool isValid() { return val != uint.max; }
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16 /// ditto
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17 bool isInvalid() { return val == uint.max; }
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18
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19 /**
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20 Extracts the file id.
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21
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22 Warning: In release mode this may return junk, if the loc is not from a
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23 file
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24 **/
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25 uint fileID() {
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26 assert(isValid, "Location is invalid");
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27 assert(isReal, "You can only extract fileID from a real location");
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28 // Here we can rely on two facts, first that the high bit is zero
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29 // since its a real position, second that FileOffset is saved in the
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30 // high end, so all we need is some shifting
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31 return val >> Bits.FileOffset;
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32 }
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33
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34 /**
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35 Extracts the offset into the "file". (actually in to the referenced
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36 chunk)
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37
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38 Warning: In release mode this may return junk, if the loc is not from a
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39 file
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40 **/
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41 uint fileOffset() {
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42 assert(isValid, "Location is invalid");
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43 assert(isReal, "You can only extract fileOffset from real locations");
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44 // FileOffset is stored in the lower bits, so all that is needed is a
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45 // binary and with all ones in the lower bits.
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46 return val & (1 << Bits.FileOffset) - 1;
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47 }
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48
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49 /// Get a new location, placed n bytes after the given location
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50 SourceLocation opAdd(int n)
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51 {
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52 SourceLocation res = *this;
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53 res.val += n;
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54 return res;
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55 }
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56
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57 /// Get a new location, placed n bytes before the given location
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58 SourceLocation opSub(int n)
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59 {
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60 SourceLocation res = *this;
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61 res.val -= n;
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62 return res;
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63 }
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64
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65 /// Creates a SourceLocation from a File ID
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66 static SourceLocation fromFileID(uint fileID)
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67 {
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68 assert(fileID < Bits.MaxFileID, "To large fileID");
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69 SourceLocation res;
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70 res.val = fileID << Bits.FileOffset;
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71 return res;
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72 }
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73
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74 /**
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75 Used for invalid/unknown locations. (also the default value, but this is
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76 more explicit)
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77 **/
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78 static const SourceLocation Invalid = {val: uint.max};
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79
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80 private:
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81 /**
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82 A SourceLocation consists of 1 bit, indicating real or virtual, meaning
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83 if the location points to a file(real), a string mixin or has been
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84 affected by #line(virtual). That information is saved in the most
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85 significant bit.
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86 The rest depends on which type we are dealing with.
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87 Real:
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88 13 bits for a file identifier
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89 18 bits for offset into that "file" (one file may be split)
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90 Virtual:
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91 Unknown for now. Likely skewed toward more ids and some meta data
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92 An invalid location is uint.max, this might happen by accident but its
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93 unlikely.
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94 **/
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95 uint val = uint.max;
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96
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97 /**
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98 This enum contains some constants that are useful for manipulating
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99 SourceLocation's, like the size of various “members” of val.
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100 **/
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101 static enum Bits {
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102 /// Number of bits used for the offset into file buffers
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103 FileOffset = 18,
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104 /// Number of bits used to identify which file buffer this is from
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105 FileID = 31 - FileOffset,
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106
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107 /// Indicates how much can be indexed within one block(2^FileOffset)
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108 MaxFileOffset = 1 << FileOffset,
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109 MaxFileID = 1 << FileID,
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110 }
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111 }
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112
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113 /// A simple pair used to describe a range in a buffer and not just a point.
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114 struct SourceRange
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115 {
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116 SourceLocation begin, end;
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117
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118 static SourceRange opCall(SourceLocation loc)
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119 {
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120 return SourceRange(loc, loc + 1);
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121 }
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122
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123 static SourceRange opCall(SourceLocation begin, SourceLocation end)
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124 {
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125 SourceRange res;
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126 res.begin = begin;
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127 res.end = end;
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128 return res;
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129 }
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130
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131 bool isValid() { return begin.isValid && end.isValid; }
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132 bool isInvalid() { return begin.isInvalid || end.isInvalid; }
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133
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134 bool isReal() { return begin.isReal && end.isReal; }
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135
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136 /// Get a new range spanning both ranges
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137 SourceRange opAdd(SourceRange that)
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138 {
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139 assert(this.isValid && that.isValid, "Invalid range");
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140 return SourceRange(
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141 this.begin.val < that.begin.val? this.begin : that.begin,
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142 this.end.val > that.end.val? this.end : that.end);
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143 }
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144 }
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145