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annotate trunk/src/dil/ast/Node.d @ 673:64fec49651cf

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Renamed VariableDeclaration to VariablesDeclaration. Removed TryCast and CastTo template functions. Renamed Node.iS() to Node.Is().
author Aziz K?ksal <aziz.koeksal@gmail.com>
date Fri, 18 Jan 2008 16:44:20 +0100
parents f1325a4506de
children c4e3a34e40f1
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1 /++
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2 Author: Aziz Köksal
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32d354584b28 - Upgraded license notices to GPL3.
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3 License: GPL3
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4 +/
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5 module dil.ast.Node;
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6
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7 import common;
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8
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9 public import dil.lexer.Token;
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10 public import dil.ast.NodesEnum;
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11
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12 /// This string is mixed into the constructor of a class that inherits from Node.
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13 const string set_kind = `this.kind = mixin("NodeKind." ~ typeof(this).stringof);`;
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14
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15 class Node
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16 {
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17 NodeCategory category;
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18 NodeKind kind;
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19 Node[] children;
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20 Token* begin, end;
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21
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22 this(NodeCategory category)
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23 {
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24 assert(category != NodeCategory.Undefined);
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25 this.category = category;
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26 }
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27
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28 void setTokens(Token* begin, Token* end)
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29 {
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30 this.begin = begin;
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31 this.end = end;
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32 }
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33
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34 Class setToks(Class)(Class node)
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35 {
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36 node.setTokens(this.begin, this.end);
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37 return node;
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38 }
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39
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40 void addChild(Node child)
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41 {
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42 assert(child !is null, "failed in " ~ this.classinfo.name);
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43 this.children ~= child;
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44 }
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45
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46 void addOptChild(Node child)
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47 {
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48 child is null || addChild(child);
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49 }
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50
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51 void addChildren(Node[] children)
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52 {
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53 assert(children !is null && delegate{
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54 foreach (child; children)
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55 if (child is null)
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56 return false;
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57 return true; }(),
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58 "failed in " ~ this.classinfo.name
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59 );
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60 this.children ~= children;
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61 }
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62
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63 void addOptChildren(Node[] children)
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64 {
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65 children is null || addChildren(children);
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66 }
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67
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68 Class Is(Class)()
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69 {
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70 if (kind == mixin("NodeKind." ~ typeof(Class).stringof))
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71 return cast(Class)cast(void*)this;
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72 return null;
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73 }
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74
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75 Class to(Class)()
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76 {
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77 return cast(Class)cast(void*)this;
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78 }
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79
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80 static bool isDoxygenComment(Token* token)
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81 { // Doxygen: '/+!' '/*!' '//!'
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82 return token.type == TOK.Comment && token.start[2] == '!';
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83 }
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84
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85 static bool isDDocComment(Token* token)
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86 { // DDOC: '/++' '/**' '///'
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87 return token.type == TOK.Comment && token.start[1] == token.start[2];
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88 }
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89
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90 /++
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91 Returns the surrounding documentation comment tokens.
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92 Note: this function works correctly only if
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93 the source text is syntactically correct.
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94 +/
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95 Token*[] getDocComments(bool function(Token*) isDocComment = &isDDocComment)
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96 {
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97 Token*[] comments;
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98 // Get preceding comments.
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99 auto token = begin;
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100 // Scan backwards until we hit another declaration.
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101 while (1)
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102 {
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103 token = token.prev;
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104 if (token.type == TOK.LBrace ||
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105 token.type == TOK.RBrace ||
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106 token.type == TOK.Semicolon ||
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107 token.type == TOK.HEAD ||
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108 (kind == NodeKind.EnumMember && token.type == TOK.Comma))
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109 break;
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110
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111 if (token.type == TOK.Comment)
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112 {
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113 // Check that this comment doesn't belong to the previous declaration.
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114 if (kind == NodeKind.EnumMember && token.type == TOK.Comma)
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115 break;
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116 switch (token.prev.type)
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117 {
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118 case TOK.Semicolon, TOK.RBrace:
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119 break;
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120 default:
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121 if (isDocComment(token))
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122 comments ~= token;
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123 }
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124 }
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125 }
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126 // Get single comment to the right.
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127 token = end.next;
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128 if (token.type == TOK.Comment && isDocComment(token))
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129 comments ~= token;
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130 else if (kind == NodeKind.EnumMember)
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131 {
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132 token = end.nextNWS;
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133 if (token.type == TOK.Comma)
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134 {
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135 token = token.next;
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136 if (token.type == TOK.Comment && isDocComment(token))
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137 comments ~= token;
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138 }
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139 }
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140 return comments;
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141 }
142
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142 }