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0
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1 /* Simple parser for CSS */
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2
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3 var CSSParser = Editor.Parser = (function() {
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4 var tokenizeCSS = (function() {
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5 function normal(source, setState) {
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6 var ch = source.next();
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7 if (ch == "@") {
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8 source.nextWhileMatches(/\w/);
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9 return "css-at";
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10 }
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11 else if (ch == "/" && source.equals("*")) {
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12 setState(inCComment);
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13 return null;
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14 }
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15 else if (ch == "<" && source.equals("!")) {
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16 setState(inSGMLComment);
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17 return null;
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18 }
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19 else if (ch == "=") {
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20 return "css-compare";
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21 }
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22 else if (source.equals("=") && (ch == "~" || ch == "|")) {
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23 source.next();
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24 return "css-compare";
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25 }
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26 else if (ch == "\"" || ch == "'") {
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27 setState(inString(ch));
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28 return null;
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29 }
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30 else if (ch == "#") {
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31 source.nextWhileMatches(/\w/);
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32 return "css-hash";
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33 }
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34 else if (ch == "!") {
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35 source.nextWhileMatches(/[ \t]/);
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36 source.nextWhileMatches(/\w/);
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37 return "css-important";
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38 }
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39 else if (/\d/.test(ch)) {
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40 source.nextWhileMatches(/[\w.%]/);
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41 return "css-unit";
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42 }
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43 else if (/[,.+>*\/]/.test(ch)) {
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44 return "css-select-op";
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45 }
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46 else if (/[;{}:\[\]]/.test(ch)) {
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47 return "css-punctuation";
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48 }
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49 else {
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50 source.nextWhileMatches(/[\w\\\-_]/);
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51 return "css-identifier";
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52 }
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53 }
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54
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55 function inCComment(source, setState) {
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56 var maybeEnd = false;
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57 while (!source.endOfLine()) {
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58 var ch = source.next();
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59 if (maybeEnd && ch == "/") {
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60 setState(normal);
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61 break;
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62 }
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63 maybeEnd = (ch == "*");
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64 }
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65 return "css-comment";
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66 }
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67
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68 function inSGMLComment(source, setState) {
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69 var dashes = 0;
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70 while (!source.endOfLine()) {
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71 var ch = source.next();
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72 if (dashes >= 2 && ch == ">") {
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73 setState(normal);
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74 break;
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75 }
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76 dashes = (ch == "-") ? dashes + 1 : 0;
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77 }
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78 return "css-comment";
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79 }
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80
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81 function inString(quote) {
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82 return function(source, setState) {
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83 var escaped = false;
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84 while (!source.endOfLine()) {
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85 var ch = source.next();
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86 if (ch == quote && !escaped)
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87 break;
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88 escaped = !escaped && ch == "\\";
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89 }
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90 if (!escaped)
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91 setState(normal);
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92 return "css-string";
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93 };
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94 }
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95
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96 return function(source, startState) {
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97 return tokenizer(source, startState || normal);
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98 };
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99 })();
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100
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101 function indentCSS(inBraces, inRule, base) {
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102 return function(nextChars) {
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103 if (!inBraces || /^\}/.test(nextChars)) return base;
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104 else if (inRule) return base + indentUnit * 2;
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105 else return base + indentUnit;
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106 };
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107 }
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108
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109 // This is a very simplistic parser -- since CSS does not really
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110 // nest, it works acceptably well, but some nicer colouroing could
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111 // be provided with a more complicated parser.
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112 function parseCSS(source, basecolumn) {
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113 basecolumn = basecolumn || 0;
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114 var tokens = tokenizeCSS(source);
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115 var inBraces = false, inRule = false, inDecl = false;;
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116
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117 var iter = {
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118 next: function() {
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119 var token = tokens.next(), style = token.style, content = token.content;
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120
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121 if (style == "css-hash")
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122 style = token.style = inRule ? "css-colorcode" : "css-identifier";
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123 if (style == "css-identifier") {
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124 if (inRule) token.style = "css-value";
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125 else if (!inBraces && !inDecl) token.style = "css-selector";
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126 }
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127
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128 if (content == "\n")
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129 token.indentation = indentCSS(inBraces, inRule, basecolumn);
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130
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131 if (content == "{" && inDecl == "@media")
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132 inDecl = false;
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133 else if (content == "{")
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134 inBraces = true;
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135 else if (content == "}")
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136 inBraces = inRule = inDecl = false;
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137 else if (content == ";")
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138 inRule = inDecl = false;
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139 else if (inBraces && style != "css-comment" && style != "whitespace")
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140 inRule = true;
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141 else if (!inBraces && style == "css-at")
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142 inDecl = content;
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143
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144 return token;
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145 },
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146
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147 copy: function() {
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148 var _inBraces = inBraces, _inRule = inRule, _tokenState = tokens.state;
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149 return function(source) {
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150 tokens = tokenizeCSS(source, _tokenState);
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151 inBraces = _inBraces;
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152 inRule = _inRule;
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153 return iter;
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154 };
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155 }
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156 };
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157 return iter;
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158 }
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159
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160 return {make: parseCSS, electricChars: "}"};
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161 })();
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