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6 |
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7 | var COMBINATORS = ['>', '+', '~'];
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18 |
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19 | var SelectorParser = module.exports = function SelectorParser(str, stack, parts) {
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20 | this.str = str;
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21 | this.stack = stack || [];
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22 | this.parts = parts || [];
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23 | this.pos = 0;
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24 | this.level = 2;
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25 | this.nested = true;
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26 | this.ignore = false;
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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 |
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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 | SelectorParser.prototype.skip = function(len) {
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37 | this.str = this.str.substr(len);
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38 | this.pos += len;
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39 | };
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40 |
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41 |
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42 |
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43 |
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44 |
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45 | SelectorParser.prototype.skipSpaces = function() {
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46 | while (' ' == this.str[0]) this.skip(1);
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47 | };
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48 |
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49 |
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50 |
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51 |
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52 |
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53 |
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54 |
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55 |
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56 | SelectorParser.prototype.advance = function() {
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57 | return this.root()
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58 | || this.relative()
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59 | || this.initial()
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60 | || this.escaped()
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61 | || this.parent()
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62 | || this.partial()
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63 | || this.char();
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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 |
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70 | SelectorParser.prototype.root = function() {
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71 | if (!this.pos && '/' == this.str[0]
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72 | && 'deep' != this.str.slice(1, 5)) {
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73 | this.nested = false;
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74 | this.skip(1);
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75 | }
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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 | SelectorParser.prototype.relative = function(multi) {
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83 | if ((!this.pos || multi) && '../' == this.str.slice(0, 3)) {
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84 | this.nested = false;
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85 | this.skip(3);
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86 | while (this.relative(true)) this.level++;
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87 | if (!this.raw) {
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88 | var ret = this.stack[this.stack.length - this.level];
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89 | if (ret) {
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90 | return ret;
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91 | } else {
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92 | this.ignore = true;
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93 | }
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94 | }
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95 | }
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96 | };
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97 |
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98 |
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99 |
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100 |
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101 |
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102 | SelectorParser.prototype.initial = function() {
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103 | if (!this.pos && '~' == this.str[0] && '/' == this.str[1]) {
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104 | this.nested = false;
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105 | this.skip(2);
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106 | return this.stack[0];
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107 | }
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108 | };
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109 |
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110 |
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111 |
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112 |
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113 |
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114 | SelectorParser.prototype.escaped = function() {
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115 | if ('\\' == this.str[0]) {
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116 | var char = this.str[1];
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117 | if ('&' == char || '^' == char) {
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118 | this.skip(2);
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119 | return char;
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120 | }
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121 | }
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122 | };
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123 |
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124 |
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125 |
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126 |
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127 |
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128 | SelectorParser.prototype.parent = function() {
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129 | if ('&' == this.str[0]) {
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130 | this.nested = false;
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131 |
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132 | if (!this.pos && (!this.stack.length || this.raw)) {
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133 | var i = 0;
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134 | while (' ' == this.str[++i]) ;
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135 | if (~COMBINATORS.indexOf(this.str[i])) {
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136 | this.skip(i + 1);
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137 | return;
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138 | }
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139 | }
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140 |
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141 | this.skip(1);
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142 | if (!this.raw)
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143 | return this.stack[this.stack.length - 1];
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144 | }
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145 | };
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146 |
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147 |
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148 |
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149 |
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150 |
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151 | SelectorParser.prototype.partial = function() {
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152 | if ('^' == this.str[0] && '[' == this.str[1]) {
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153 | this.skip(2);
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154 | this.skipSpaces();
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155 | var ret = this.range();
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156 | this.skipSpaces();
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157 | if (']' != this.str[0]) return '^[';
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158 | this.nested = false;
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159 | this.skip(1);
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160 | if (ret) {
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161 | return ret;
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162 | } else {
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163 | this.ignore = true;
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164 | }
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165 | }
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166 | };
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167 |
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168 |
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169 |
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170 |
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171 |
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172 | SelectorParser.prototype.number = function() {
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173 | var i = 0, ret = '';
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174 | if ('-' == this.str[i])
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175 | ret += this.str[i++];
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176 |
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177 | while (this.str.charCodeAt(i) >= 48
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178 | && this.str.charCodeAt(i) <= 57)
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179 | ret += this.str[i++];
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180 |
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181 | if (ret) {
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182 | this.skip(i);
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183 | return Number(ret);
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184 | }
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185 | };
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186 |
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187 |
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188 |
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189 |
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190 |
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191 | SelectorParser.prototype.range = function() {
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192 | var start = this.number()
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193 | , ret;
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194 |
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195 | if ('..' == this.str.slice(0, 2)) {
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196 | this.skip(2);
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197 | var end = this.number()
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198 | , len = this.parts.length;
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199 |
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200 | if (start < 0) start = len + start - 1;
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201 | if (end < 0) end = len + end - 1;
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202 |
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203 | if (start > end) {
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204 | var tmp = start;
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205 | start = end;
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206 | end = tmp;
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207 | }
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208 |
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209 | if (end < len - 1) {
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210 | ret = this.parts.slice(start, end + 1).map(function(part) {
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211 | var selector = new SelectorParser(part, this.stack, this.parts);
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212 | selector.raw = true;
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213 | return selector.parse();
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214 | }, this).map(function(selector) {
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215 | return (selector.nested ? ' ' : '') + selector.val;
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216 | }).join('').trim();
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217 | }
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218 | } else {
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219 | ret = this.stack[
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220 | start < 0 ? this.stack.length + start - 1 : start
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221 | ];
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222 | }
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223 |
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224 | if (ret) {
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225 | return ret;
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226 | } else {
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227 | this.ignore = true;
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228 | }
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229 | };
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230 |
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231 |
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232 |
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233 |
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234 |
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235 | SelectorParser.prototype.char = function() {
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236 | var char = this.str[0];
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237 | this.skip(1);
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238 | return char;
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239 | };
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240 |
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241 |
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242 |
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243 |
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244 |
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245 |
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246 |
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247 |
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248 | SelectorParser.prototype.parse = function() {
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249 | var val = '';
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250 | while (this.str.length) {
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251 | val += this.advance() || '';
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252 | if (this.ignore) {
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253 | val = '';
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254 | break;
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255 | }
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256 | }
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257 | return { val: val.trimRight(), nested: this.nested };
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258 | };
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