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7 |
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10 |
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11 |
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12 | var Token = require('./token')
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13 | , nodes = require('./nodes');
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14 |
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15 |
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16 |
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17 |
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18 |
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19 | var alias = {
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20 | 'and': '&&'
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21 | , 'or': '||'
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22 | , 'is': '=='
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23 | , 'isnt': '!='
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24 | , 'is not': '!='
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25 | };
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26 |
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27 |
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28 |
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29 |
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30 |
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31 | var numberString = [, 'one', 'two'];
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32 |
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33 |
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34 |
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35 |
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36 |
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37 | var units = [
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38 | 'em'
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39 | , 'ex'
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40 | , 'px'
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41 | , 'mm'
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42 | , 'cm'
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43 | , 'in'
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44 | , 'pt'
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45 | , 'pc'
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46 | , 'deg'
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47 | , 'rad'
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48 | , 'grad'
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49 | , 'ms'
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50 | , 's'
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51 | , 'Hz'
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52 | , 'kHz'
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53 | , '%'].join('|');
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54 |
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55 |
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56 |
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57 |
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58 |
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59 | var unit = new RegExp('^(-)?(\\d+\\.\\d+|\\d+|\\.\\d+)(' + units + ')? *');
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60 |
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61 |
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62 |
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63 |
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64 |
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65 |
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66 |
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67 |
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68 |
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69 | var Lexer = module.exports = function Lexer(str, options) {
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70 | options = options || {};
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71 | this.str = str.replace(/\r\n?/g, '\n');
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72 | this.stash = [];
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73 | this.indentStack = [];
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74 | this.indentRe = null;
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75 | this.lineno = 0;
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76 | };
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77 |
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78 |
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79 |
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80 |
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81 |
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82 | Lexer.prototype = {
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83 |
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84 | |
85 |
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86 |
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87 |
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88 | inspect: function(){
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89 | var tok
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90 | , tmp = this.str
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91 | , buf = [];
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92 | while ('eos' != (tok = this.next).type) {
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93 | buf.push(tok.inspect());
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94 | }
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95 | this.str = tmp;
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96 | this.prevIndents = 0;
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97 | return buf.concat(tok.inspect()).join('\n');
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98 | },
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99 |
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100 | |
101 |
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102 |
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103 |
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104 |
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105 |
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106 |
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107 |
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108 | lookahead: function(n){
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109 | var fetch = n - this.stash.length;
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110 | while (fetch-- > 0) this.stash.push(this.advance);
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111 | return this.stash[--n];
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112 | },
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113 |
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114 | |
115 |
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116 |
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117 |
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118 |
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119 |
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120 |
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121 | skip: function(len){
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122 | this.str = this.str.substr(Array.isArray(len)
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123 | ? len[0].length
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124 | : len);
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125 | },
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126 |
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127 | |
128 |
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129 |
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130 |
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131 |
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132 |
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133 |
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134 | get next() {
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135 | var tok = this.stashed || this.advance;
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136 | switch (tok.type) {
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137 | case 'newline':
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138 | case 'selector':
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139 | case 'indent':
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140 | ++this.lineno;
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141 | }
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142 | tok.lineno = this.lineno;
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143 | return tok;
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144 | },
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145 |
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146 | |
147 |
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148 |
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149 |
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150 |
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151 |
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152 |
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153 | get advance() {
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154 | return this.eos
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155 | || this.null
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156 | || this.sep
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157 | || this.keyword
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158 | || this.urlchars
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159 | || this.atrule
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160 | || this.media
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161 | || this.comment
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162 | || this.newline
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163 | || this.escaped
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164 | || this.important
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165 | || this.literal
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166 | || this.function
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167 | || this.brace
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168 | || this.paren
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169 | || this.color
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170 | || this.string
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171 | || this.unit
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172 | || this.namedop
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173 | || this.boolean
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174 | || this.ident
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175 | || this.op
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176 | || this.space
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177 | || this.selector;
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178 | },
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179 |
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180 | |
181 |
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182 |
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183 |
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184 |
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185 |
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186 |
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187 | get peek() {
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188 | return this.lookahead(1);
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189 | },
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190 |
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191 | |
192 |
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193 |
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194 |
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195 |
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196 |
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197 |
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198 | get stashed() {
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199 | return this.stash.shift();
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200 | },
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201 |
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202 | |
203 |
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204 |
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205 |
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206 | get eos() {
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207 | if (this.str.length) return;
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208 | if (this.indentStack.length) {
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209 | this.indentStack.shift();
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210 | return new Token('outdent');
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211 | } else {
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212 | return new Token('eos');
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213 | }
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214 | },
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215 |
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216 | |
217 |
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218 |
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219 |
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220 | get urlchars() {
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221 | var captures;
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222 | if (!this.isURL) return;
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223 | if (captures = /^[\/:@.;?&=*!,<>#%0-9]+/.exec(this.str)) {
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224 | this.skip(captures);
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225 | return new Token('literal', new nodes.Literal(captures[0]));
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226 | }
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227 | },
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228 |
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229 | |
230 |
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231 |
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232 |
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233 | get sep() {
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234 | var captures;
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235 | if (captures = /^; */.exec(this.str)) {
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236 | this.skip(captures);
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237 | return new Token(';');
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238 | }
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239 | },
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240 |
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241 | |
242 |
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243 |
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244 |
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245 | get space() {
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246 | var captures;
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247 | if (captures = /^( +)/.exec(this.str)) {
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248 | this.skip(captures);
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249 | return new Token('space');
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250 | }
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251 | },
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252 |
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253 | |
254 |
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255 |
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256 |
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257 | get escaped() {
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258 | var captures;
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259 | if (captures = /^\\(.) */.exec(this.str)) {
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260 | var c = captures[1];
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261 | this.skip(captures);
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262 | return new Token('ident', new nodes.Literal(c));
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263 | }
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264 | },
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265 |
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266 | |
267 |
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268 |
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269 |
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270 | get literal() {
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271 |
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272 | var captures;
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273 | if (captures = /^@css *\{/.exec(this.str)) {
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274 | this.skip(captures);
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275 | var c
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276 | , braces = 1
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277 | , css = '';
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278 | while (c = this.str[0]) {
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279 | this.str = this.str.substr(1);
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280 | switch (c) {
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281 | case '{': ++braces; break;
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282 | case '}': --braces; break;
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283 | }
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284 | css += c;
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285 | if (!braces) break;
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286 | }
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287 | css = css.replace(/\s*}$/, '');
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288 | return new Token('literal', new nodes.Literal(css));
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289 | }
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290 | },
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291 |
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292 | |
293 |
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294 |
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295 |
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296 | get important() {
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297 | var captures;
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298 | if (captures = /^!important */.exec(this.str)) {
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299 | this.skip(captures);
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300 | return new Token('ident', new nodes.Literal('!important'));
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301 | }
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302 | },
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303 |
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304 | |
305 |
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306 |
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307 |
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308 | get brace() {
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309 | var captures;
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310 | if (captures = /^([{}])/.exec(this.str)) {
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311 | this.skip(1);
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312 | var brace = captures[1];
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313 | return new Token(brace, brace);
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314 | }
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315 | },
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316 |
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317 | |
318 |
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319 |
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320 |
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321 | get paren() {
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322 | var captures;
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323 | if (captures = /^([()]) */.exec(this.str)) {
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324 | var paren = captures[1];
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325 | this.skip(captures);
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326 | if (')' == paren) this.isURL = false;
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327 | return new Token(paren, paren);
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328 | }
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329 | },
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330 |
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331 | |
332 |
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333 |
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334 |
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335 | get null() {
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336 | var captures;
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337 | if (captures = /^(null)\b */.exec(this.str)) {
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338 | this.skip(captures);
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339 | return new Token('null', nodes.null);
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340 | }
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341 | },
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342 |
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343 | |
344 |
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345 |
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346 |
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347 |
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348 |
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349 |
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350 |
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351 |
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352 | get keyword() {
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353 | var captures;
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354 | if (captures = /^(return|if|else|unless|for|in)\b */.exec(this.str)) {
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355 | var keyword = captures[1];
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356 | this.skip(captures);
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357 | return new Token(keyword, keyword);
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358 | }
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359 | },
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360 |
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361 | |
362 |
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363 |
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364 |
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365 |
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366 |
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367 |
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368 |
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369 |
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370 |
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371 |
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372 | get namedop() {
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373 | var captures;
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374 | if (captures = /^(not|and|or|is a|is defined|isnt|is not|is)\b( *)/.exec(this.str)) {
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375 | var op = captures[1];
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376 | this.skip(captures);
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377 | op = alias[op] || op;
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378 | var tok = new Token(op, op);
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379 | tok.space = captures[2];
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380 | return tok;
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381 | }
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382 | },
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383 |
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384 | |
385 |
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386 |
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387 |
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388 |
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389 |
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390 |
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391 |
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392 |
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393 |
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394 |
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395 |
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396 |
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397 |
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398 |
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399 |
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400 |
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401 |
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402 |
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403 |
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404 |
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405 |
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406 |
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407 |
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408 |
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409 |
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410 |
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411 |
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412 |
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413 |
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414 |
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415 |
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416 |
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417 |
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418 |
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419 | get op() {
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420 | var captures;
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421 | if (captures = /^([.]{2,3}|&&|\|\||[!<>=?]=|\*\*|[-+*\/%]=?|[,=?:!~<>&\[\]])( *)/.exec(this.str)) {
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422 | var op = captures[1];
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423 | this.skip(captures);
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424 | op = alias[op] || op;
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425 | var tok = new Token(op, op);
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426 | tok.space = captures[2];
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427 | return tok;
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428 | }
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429 | },
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430 |
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431 | |
432 |
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433 |
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434 |
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435 | get media() {
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436 | var captures;
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437 | if (captures = /^@media *([^{\n]+)/.exec(this.str)) {
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438 | this.skip(captures);
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439 | return new Token('media', captures[1].trim());
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440 | }
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441 | },
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442 |
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443 | |
444 |
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445 |
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446 |
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447 | get atrule() {
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448 | var captures;
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449 | if (captures = /^@(import|keyframes|charset|page) */.exec(this.str)) {
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450 | this.skip(captures);
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451 | return new Token(captures[1]);
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452 | }
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453 | },
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454 |
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455 | |
456 |
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457 |
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458 |
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459 | get comment() {
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460 |
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461 | if ('/' == this.str[0] && '/' == this.str[1]) {
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462 | var end = this.str.indexOf('\n');
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463 | if (-1 == end) end = this.str.length;
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464 | this.skip(end);
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465 | return this.advance;
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466 | }
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467 |
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468 |
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469 | if ('/' == this.str[0] && '*' == this.str[1]) {
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470 | var end = this.str.indexOf('*/');
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471 | if (-1 == end) end = this.str.length;
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472 | var str = this.str.substr(0, end + 2)
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473 | , lines = str.split('\n').length - 1;
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474 | this.lineno += lines;
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475 | this.skip(end + 2);
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476 | return this.allowComments
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477 | ? new Token('comment', str)
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478 | : this.advance;
|
479 | }
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480 | },
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481 |
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482 | |
483 |
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484 |
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485 |
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486 | get boolean() {
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487 | var captures;
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488 | if (captures = /^(true|false)\b( *)/.exec(this.str)) {
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489 | var val = 'true' == captures[1]
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490 | ? nodes.true
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491 | : nodes.false;
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492 | this.skip(captures);
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493 | var tok = new Token('boolean', val);
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494 | tok.space = captures[2];
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495 | return tok;
|
496 | }
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497 | },
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498 |
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499 | |
500 |
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501 |
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502 |
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503 | get function() {
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504 | var captures;
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505 | if (captures = /^(-?[a-zA-Z$][-\w\d$]*)\(( *)/.exec(this.str)) {
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506 | var name = captures[1];
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507 | this.skip(captures);
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508 | this.isURL = 'url' == name;
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509 | var tok = new Token('function', new nodes.Ident(name));
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510 | tok.space = captures[2];
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511 | return tok;
|
512 | }
|
513 | },
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514 |
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515 | |
516 |
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517 |
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518 |
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519 | get ident() {
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520 | var captures;
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521 | if (captures = /^(-?[a-zA-Z$][-\w\d$]*)/.exec(this.str)) {
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522 | var name = captures[1];
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523 | this.skip(captures);
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524 | return new Token('ident', new nodes.Ident(name));
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525 | }
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526 | },
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527 |
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528 | |
529 |
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530 |
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531 |
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532 | get newline() {
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533 | var captures, re;
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534 |
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535 |
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536 | if (this.indentRe){
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537 | captures = this.indentRe.exec(this.str);
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538 |
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539 | } else {
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540 |
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541 | re = /^\n([\t]*) */;
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542 | captures = re.exec(this.str);
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543 |
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544 |
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545 | if (captures && !captures[1].length) {
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546 | re = /^\n( *)/;
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547 | captures = re.exec(this.str);
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548 | }
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549 |
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550 |
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551 | if (captures && captures[1].length) this.indentRe = re;
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552 | }
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553 |
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554 |
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555 | if (captures) {
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556 | var tok
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557 | , indents = captures[1].length;
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558 |
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559 | this.skip(captures);
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560 | if (this.str[0] === ' ' || this.str[0] === '\t') {
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561 | throw new Error('Invalid indentation, you can use tabs or spaces to indent but not both');
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562 | }
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563 |
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564 |
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565 | this.isVariable = false;
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566 |
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567 |
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568 | if ('\n' == this.str[0]) {
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569 | ++this.lineno;
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570 | return this.advance;
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571 | }
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572 |
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573 |
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574 | if (this.indentStack.length && indents < this.indentStack[0]) {
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575 | while (this.indentStack.length && this.indentStack[0] > indents) {
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576 | this.stash.push(new Token('outdent'));
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577 | this.indentStack.shift();
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578 | }
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579 | tok = this.stash.pop();
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580 |
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581 | } else if (indents && indents != this.indentStack[0]) {
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582 | this.indentStack.unshift(indents);
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583 | tok = new Token('indent');
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584 |
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585 | } else {
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586 | tok = new Token('newline');
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587 | }
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588 |
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589 | return tok;
|
590 | }
|
591 | },
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592 |
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593 | |
594 |
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595 |
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596 |
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597 | get unit() {
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598 | var captures;
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599 | if (captures = unit.exec(this.str)) {
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600 | this.skip(captures);
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601 | var n = parseFloat(captures[2]);
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602 | if ('-' == captures[1]) n = -n;
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603 | var node = new nodes.Unit(n, captures[3]);
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604 | return new Token('unit', node);
|
605 | }
|
606 | },
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607 |
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608 | |
609 |
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610 |
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611 |
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612 | get string() {
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613 | var captures;
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614 | if (captures = /^("[^"]*"|'[^']*') */.exec(this.str)) {
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615 | var str = captures[1];
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616 | this.skip(captures);
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617 | return new Token('string', new nodes.String(str.slice(1,-1)));
|
618 | }
|
619 | },
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620 |
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621 | |
622 |
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623 |
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624 |
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625 | get color() {
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626 | return this.hex6 || this.hex3;
|
627 | },
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628 |
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629 | |
630 |
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631 |
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632 |
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633 | get hex3() {
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634 | var captures;
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635 | if (captures = /^#([a-fA-F0-9]{3}) */.exec(this.str)) {
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636 | this.skip(captures);
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637 | var rgb = captures[1]
|
638 | , r = parseInt(rgb[0] + rgb[0], 16)
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639 | , g = parseInt(rgb[1] + rgb[1], 16)
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640 | , b = parseInt(rgb[2] + rgb[2], 16)
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641 | , color = new nodes.Color(r, g, b, 1);
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642 | color.raw = captures[0];
|
643 | return new Token('color', color);
|
644 | }
|
645 | },
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646 |
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647 | |
648 |
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649 |
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650 |
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651 | get hex6() {
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652 | var captures;
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653 | if (captures = /^#([a-fA-F0-9]{6}) */.exec(this.str)) {
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654 | this.skip(captures);
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655 | var rgb = captures[1]
|
656 | , r = parseInt(rgb.substr(0, 2), 16)
|
657 | , g = parseInt(rgb.substr(2, 2), 16)
|
658 | , b = parseInt(rgb.substr(4, 2), 16)
|
659 | , color = new nodes.Color(r, g, b, 1);
|
660 | color.raw = captures[0];
|
661 | return new Token('color', color);
|
662 | }
|
663 | },
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664 |
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665 | |
666 |
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667 |
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668 |
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669 | get selector() {
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670 | var captures;
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671 | if (captures = /^[^{\n,]+/.exec(this.str)) {
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672 | var selector = captures[0];
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673 | this.skip(captures);
|
674 | return new Token('selector', selector);
|
675 | }
|
676 | }
|
677 | };
|