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6 | "use strict";
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29 |
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30 |
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31 |
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32 | const CC_LINE_FEED = "\n".charCodeAt(0);
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33 | const CC_CARRIAGE_RETURN = "\r".charCodeAt(0);
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34 | const CC_FORM_FEED = "\f".charCodeAt(0);
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35 |
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36 | const CC_TAB = "\t".charCodeAt(0);
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37 | const CC_SPACE = " ".charCodeAt(0);
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38 |
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39 | const CC_SLASH = "/".charCodeAt(0);
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40 | const CC_BACK_SLASH = "\\".charCodeAt(0);
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41 | const CC_ASTERISK = "*".charCodeAt(0);
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42 |
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43 | const CC_LEFT_PARENTHESIS = "(".charCodeAt(0);
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44 | const CC_RIGHT_PARENTHESIS = ")".charCodeAt(0);
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45 | const CC_LEFT_CURLY = "{".charCodeAt(0);
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46 | const CC_RIGHT_CURLY = "}".charCodeAt(0);
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47 |
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48 | const CC_QUOTATION_MARK = '"'.charCodeAt(0);
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49 | const CC_APOSTROPHE = "'".charCodeAt(0);
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50 |
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51 | const CC_FULL_STOP = ".".charCodeAt(0);
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52 | const CC_COLON = ":".charCodeAt(0);
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53 | const CC_SEMICOLON = ";".charCodeAt(0);
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54 | const CC_COMMA = ",".charCodeAt(0);
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55 | const CC_PERCENTAGE = "%".charCodeAt(0);
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56 | const CC_AT_SIGN = "@".charCodeAt(0);
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57 |
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58 | const CC_LOW_LINE = "_".charCodeAt(0);
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59 | const CC_LOWER_A = "a".charCodeAt(0);
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60 | const CC_LOWER_U = "u".charCodeAt(0);
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61 | const CC_LOWER_E = "e".charCodeAt(0);
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62 | const CC_LOWER_Z = "z".charCodeAt(0);
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63 | const CC_UPPER_A = "A".charCodeAt(0);
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64 | const CC_UPPER_E = "E".charCodeAt(0);
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65 | const CC_UPPER_Z = "Z".charCodeAt(0);
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66 | const CC_0 = "0".charCodeAt(0);
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67 | const CC_9 = "9".charCodeAt(0);
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68 |
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69 | const CC_NUMBER_SIGN = "#".charCodeAt(0);
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70 | const CC_PLUS_SIGN = "+".charCodeAt(0);
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71 | const CC_HYPHEN_MINUS = "-".charCodeAt(0);
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72 |
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73 | const CC_LESS_THAN_SIGN = "<".charCodeAt(0);
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74 | const CC_GREATER_THAN_SIGN = ">".charCodeAt(0);
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75 |
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76 | const _isNewLine = cc => {
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77 | return (
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78 | cc === CC_LINE_FEED || cc === CC_CARRIAGE_RETURN || cc === CC_FORM_FEED
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79 | );
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80 | };
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81 |
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82 |
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83 | const consumeSpace = (input, pos, callbacks) => {
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84 | let cc;
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85 | do {
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86 | pos++;
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87 | cc = input.charCodeAt(pos);
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88 | } while (_isWhiteSpace(cc));
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89 | return pos;
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90 | };
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91 |
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92 | const _isWhiteSpace = cc => {
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93 | return (
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94 | cc === CC_LINE_FEED ||
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95 | cc === CC_CARRIAGE_RETURN ||
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96 | cc === CC_FORM_FEED ||
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97 | cc === CC_TAB ||
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98 | cc === CC_SPACE
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99 | );
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100 | };
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101 |
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102 |
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103 | const consumeSingleCharToken = (input, pos, callbacks) => {
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104 | return pos + 1;
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105 | };
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106 |
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107 |
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108 | const consumePotentialComment = (input, pos, callbacks) => {
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109 | pos++;
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110 | if (pos === input.length) return pos;
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111 | let cc = input.charCodeAt(pos);
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112 | if (cc !== CC_ASTERISK) return pos;
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113 | for (;;) {
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114 | pos++;
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115 | if (pos === input.length) return pos;
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116 | cc = input.charCodeAt(pos);
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117 | while (cc === CC_ASTERISK) {
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118 | pos++;
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119 | if (pos === input.length) return pos;
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120 | cc = input.charCodeAt(pos);
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121 | if (cc === CC_SLASH) return pos + 1;
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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 | const consumeString = end => (input, pos, callbacks) => {
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128 | const start = pos;
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129 | pos = _consumeString(input, pos, end);
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130 | if (callbacks.string !== undefined) {
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131 | pos = callbacks.string(input, start, pos);
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132 | }
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133 | return pos;
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134 | };
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135 |
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136 | const _consumeString = (input, pos, end) => {
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137 | pos++;
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138 | for (;;) {
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139 | if (pos === input.length) return pos;
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140 | const cc = input.charCodeAt(pos);
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141 | if (cc === end) return pos + 1;
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142 | if (_isNewLine(cc)) {
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143 |
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144 | return pos;
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145 | }
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146 | if (cc === CC_BACK_SLASH) {
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147 |
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148 |
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149 | pos++;
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150 | if (pos === input.length) return pos;
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151 | pos++;
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152 | } else {
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153 | pos++;
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154 | }
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155 | }
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156 | };
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157 |
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158 | const _isIdentifierStartCode = cc => {
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159 | return (
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160 | cc === CC_LOW_LINE ||
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161 | (cc >= CC_LOWER_A && cc <= CC_LOWER_Z) ||
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162 | (cc >= CC_UPPER_A && cc <= CC_UPPER_Z) ||
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163 | cc > 0x80
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164 | );
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165 | };
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166 |
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167 | const _isDigit = cc => {
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168 | return cc >= CC_0 && cc <= CC_9;
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169 | };
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170 |
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171 | const _startsIdentifier = (input, pos) => {
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172 | const cc = input.charCodeAt(pos);
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173 | if (cc === CC_HYPHEN_MINUS) {
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174 | if (pos === input.length) return false;
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175 | const cc = input.charCodeAt(pos + 1);
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176 | if (cc === CC_HYPHEN_MINUS) return true;
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177 | if (cc === CC_BACK_SLASH) {
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178 | const cc = input.charCodeAt(pos + 2);
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179 | return !_isNewLine(cc);
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180 | }
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181 | return _isIdentifierStartCode(cc);
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182 | }
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183 | if (cc === CC_BACK_SLASH) {
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184 | const cc = input.charCodeAt(pos + 1);
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185 | return !_isNewLine(cc);
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186 | }
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187 | return _isIdentifierStartCode(cc);
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188 | };
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189 |
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190 |
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191 | const consumeNumberSign = (input, pos, callbacks) => {
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192 | const start = pos;
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193 | pos++;
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194 | if (pos === input.length) return pos;
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195 | if (callbacks.isSelector(input, pos) && _startsIdentifier(input, pos)) {
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196 | pos = _consumeIdentifier(input, pos);
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197 | if (callbacks.id !== undefined) {
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198 | return callbacks.id(input, start, pos);
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199 | }
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200 | }
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201 | return pos;
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202 | };
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203 |
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204 |
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205 | const consumeMinus = (input, pos, callbacks) => {
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206 | const start = pos;
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207 | pos++;
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208 | if (pos === input.length) return pos;
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209 | const cc = input.charCodeAt(pos);
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210 | if (cc === CC_FULL_STOP || _isDigit(cc)) {
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211 | return consumeNumericToken(input, pos, callbacks);
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212 | } else if (cc === CC_HYPHEN_MINUS) {
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213 | pos++;
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214 | if (pos === input.length) return pos;
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215 | const cc = input.charCodeAt(pos);
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216 | if (cc === CC_GREATER_THAN_SIGN) {
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217 | return pos + 1;
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218 | } else {
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219 | pos = _consumeIdentifier(input, pos);
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220 | if (callbacks.identifier !== undefined) {
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221 | return callbacks.identifier(input, start, pos);
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222 | }
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223 | }
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224 | } else if (cc === CC_BACK_SLASH) {
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225 | if (pos + 1 === input.length) return pos;
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226 | const cc = input.charCodeAt(pos + 1);
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227 | if (_isNewLine(cc)) return pos;
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228 | pos = _consumeIdentifier(input, pos);
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229 | if (callbacks.identifier !== undefined) {
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230 | return callbacks.identifier(input, start, pos);
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231 | }
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232 | } else if (_isIdentifierStartCode(cc)) {
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233 | pos++;
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234 | pos = _consumeIdentifier(input, pos);
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235 | if (callbacks.identifier !== undefined) {
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236 | return callbacks.identifier(input, start, pos);
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237 | }
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238 | }
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239 | return pos;
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240 | };
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241 |
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242 |
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243 | const consumeDot = (input, pos, callbacks) => {
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244 | const start = pos;
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245 | pos++;
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246 | if (pos === input.length) return pos;
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247 | const cc = input.charCodeAt(pos);
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248 | if (_isDigit(cc)) return consumeNumericToken(input, pos - 2, callbacks);
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249 | if (!callbacks.isSelector(input, pos) || !_startsIdentifier(input, pos))
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250 | return pos;
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251 | pos = _consumeIdentifier(input, pos);
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252 | if (callbacks.class !== undefined) return callbacks.class(input, start, pos);
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253 | return pos;
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254 | };
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255 |
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256 |
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257 | const consumeNumericToken = (input, pos, callbacks) => {
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258 | pos = _consumeNumber(input, pos);
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259 | if (pos === input.length) return pos;
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260 | if (_startsIdentifier(input, pos)) return _consumeIdentifier(input, pos);
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261 | const cc = input.charCodeAt(pos);
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262 | if (cc === CC_PERCENTAGE) return pos + 1;
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263 | return pos;
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264 | };
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265 |
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266 |
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267 | const consumeOtherIdentifier = (input, pos, callbacks) => {
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268 | const start = pos;
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269 | pos = _consumeIdentifier(input, pos);
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270 | if (
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271 | pos !== input.length &&
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272 | !callbacks.isSelector(input, pos) &&
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273 | input.charCodeAt(pos) === CC_LEFT_PARENTHESIS
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274 | ) {
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275 | pos++;
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276 | if (callbacks.function !== undefined) {
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277 | return callbacks.function(input, start, pos);
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278 | }
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279 | } else {
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280 | if (callbacks.identifier !== undefined) {
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281 | return callbacks.identifier(input, start, pos);
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282 | }
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283 | }
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284 | return pos;
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285 | };
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286 |
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287 |
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288 | const consumePotentialUrl = (input, pos, callbacks) => {
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289 | const start = pos;
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290 | pos = _consumeIdentifier(input, pos);
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291 | if (pos === start + 3 && input.slice(start, pos + 1) === "url(") {
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292 | pos++;
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293 | let cc = input.charCodeAt(pos);
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294 | while (_isWhiteSpace(cc)) {
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295 | pos++;
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296 | if (pos === input.length) return pos;
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297 | cc = input.charCodeAt(pos);
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298 | }
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299 | if (cc === CC_QUOTATION_MARK || cc === CC_APOSTROPHE) {
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300 | pos++;
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301 | const contentStart = pos;
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302 | pos = _consumeString(input, pos, cc);
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303 | const contentEnd = pos - 1;
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304 | cc = input.charCodeAt(pos);
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305 | while (_isWhiteSpace(cc)) {
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306 | pos++;
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307 | if (pos === input.length) return pos;
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308 | cc = input.charCodeAt(pos);
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309 | }
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310 | if (cc !== CC_RIGHT_PARENTHESIS) return pos;
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311 | pos++;
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312 | if (callbacks.url !== undefined)
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313 | return callbacks.url(input, start, pos, contentStart, contentEnd);
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314 | return pos;
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315 | } else {
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316 | const contentStart = pos;
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317 | let contentEnd;
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318 | for (;;) {
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319 | if (cc === CC_BACK_SLASH) {
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320 | pos++;
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321 | if (pos === input.length) return pos;
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322 | pos++;
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323 | } else if (_isWhiteSpace(cc)) {
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324 | contentEnd = pos;
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325 | do {
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326 | pos++;
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327 | if (pos === input.length) return pos;
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328 | cc = input.charCodeAt(pos);
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329 | } while (_isWhiteSpace(cc));
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330 | if (cc !== CC_RIGHT_PARENTHESIS) return pos;
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331 | pos++;
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332 | if (callbacks.url !== undefined) {
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333 | return callbacks.url(input, start, pos, contentStart, contentEnd);
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334 | }
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335 | return pos;
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336 | } else if (cc === CC_RIGHT_PARENTHESIS) {
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337 | contentEnd = pos;
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338 | pos++;
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339 | if (callbacks.url !== undefined) {
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340 | return callbacks.url(input, start, pos, contentStart, contentEnd);
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341 | }
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342 | return pos;
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343 | } else if (cc === CC_LEFT_PARENTHESIS) {
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344 | return pos;
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345 | } else {
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346 | pos++;
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347 | }
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348 | if (pos === input.length) return pos;
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349 | cc = input.charCodeAt(pos);
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350 | }
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351 | }
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352 | } else {
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353 | if (callbacks.identifier !== undefined) {
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354 | return callbacks.identifier(input, start, pos);
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355 | }
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356 | return pos;
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357 | }
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358 | };
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359 |
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360 |
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361 | const consumePotentialPseudo = (input, pos, callbacks) => {
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362 | const start = pos;
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363 | pos++;
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364 | if (!callbacks.isSelector(input, pos) || !_startsIdentifier(input, pos))
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365 | return pos;
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366 | pos = _consumeIdentifier(input, pos);
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367 | let cc = input.charCodeAt(pos);
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368 | if (cc === CC_LEFT_PARENTHESIS) {
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369 | pos++;
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370 | if (callbacks.pseudoFunction !== undefined) {
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371 | return callbacks.pseudoFunction(input, start, pos);
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372 | }
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373 | return pos;
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374 | }
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375 | if (callbacks.pseudoClass !== undefined) {
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376 | return callbacks.pseudoClass(input, start, pos);
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377 | }
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378 | return pos;
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379 | };
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380 |
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381 |
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382 | const consumeLeftParenthesis = (input, pos, callbacks) => {
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383 | pos++;
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384 | if (callbacks.leftParenthesis !== undefined) {
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385 | return callbacks.leftParenthesis(input, pos - 1, pos);
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386 | }
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387 | return pos;
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388 | };
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389 |
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390 |
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391 | const consumeRightParenthesis = (input, pos, callbacks) => {
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392 | pos++;
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393 | if (callbacks.rightParenthesis !== undefined) {
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394 | return callbacks.rightParenthesis(input, pos - 1, pos);
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395 | }
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396 | return pos;
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397 | };
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398 |
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399 |
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400 | const consumeLeftCurlyBracket = (input, pos, callbacks) => {
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401 | pos++;
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402 | if (callbacks.leftCurlyBracket !== undefined) {
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403 | return callbacks.leftCurlyBracket(input, pos - 1, pos);
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404 | }
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405 | return pos;
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406 | };
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407 |
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408 |
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409 | const consumeRightCurlyBracket = (input, pos, callbacks) => {
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410 | pos++;
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411 | if (callbacks.rightCurlyBracket !== undefined) {
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412 | return callbacks.rightCurlyBracket(input, pos - 1, pos);
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413 | }
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414 | return pos;
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415 | };
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416 |
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417 |
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418 | const consumeSemicolon = (input, pos, callbacks) => {
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419 | pos++;
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420 | if (callbacks.semicolon !== undefined) {
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421 | return callbacks.semicolon(input, pos - 1, pos);
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422 | }
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423 | return pos;
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424 | };
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425 |
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426 |
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427 | const consumeComma = (input, pos, callbacks) => {
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428 | pos++;
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429 | if (callbacks.comma !== undefined) {
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430 | return callbacks.comma(input, pos - 1, pos);
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431 | }
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432 | return pos;
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433 | };
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434 |
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435 | const _consumeIdentifier = (input, pos) => {
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436 | for (;;) {
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437 | const cc = input.charCodeAt(pos);
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438 | if (cc === CC_BACK_SLASH) {
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439 | pos++;
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440 | if (pos === input.length) return pos;
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441 | pos++;
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442 | } else if (
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443 | _isIdentifierStartCode(cc) ||
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444 | _isDigit(cc) ||
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445 | cc === CC_HYPHEN_MINUS
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446 | ) {
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447 | pos++;
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448 | } else {
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449 | return pos;
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450 | }
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451 | }
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452 | };
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453 |
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454 | const _consumeNumber = (input, pos) => {
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455 | pos++;
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456 | if (pos === input.length) return pos;
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457 | let cc = input.charCodeAt(pos);
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458 | while (_isDigit(cc)) {
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459 | pos++;
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460 | if (pos === input.length) return pos;
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461 | cc = input.charCodeAt(pos);
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462 | }
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463 | if (cc === CC_FULL_STOP && pos + 1 !== input.length) {
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464 | const next = input.charCodeAt(pos + 1);
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465 | if (_isDigit(next)) {
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466 | pos += 2;
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467 | cc = input.charCodeAt(pos);
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468 | while (_isDigit(cc)) {
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469 | pos++;
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470 | if (pos === input.length) return pos;
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471 | cc = input.charCodeAt(pos);
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472 | }
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473 | }
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474 | }
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475 | if (cc === CC_LOWER_E || cc === CC_UPPER_E) {
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476 | if (pos + 1 !== input.length) {
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477 | const next = input.charCodeAt(pos + 2);
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478 | if (_isDigit(next)) {
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479 | pos += 2;
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480 | } else if (
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481 | (next === CC_HYPHEN_MINUS || next === CC_PLUS_SIGN) &&
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482 | pos + 2 !== input.length
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483 | ) {
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484 | const next = input.charCodeAt(pos + 2);
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485 | if (_isDigit(next)) {
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486 | pos += 3;
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487 | } else {
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488 | return pos;
|
489 | }
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490 | } else {
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491 | return pos;
|
492 | }
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493 | }
|
494 | } else {
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495 | return pos;
|
496 | }
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497 | cc = input.charCodeAt(pos);
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498 | while (_isDigit(cc)) {
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499 | pos++;
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500 | if (pos === input.length) return pos;
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501 | cc = input.charCodeAt(pos);
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502 | }
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503 | return pos;
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504 | };
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505 |
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506 |
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507 | const consumeLessThan = (input, pos, callbacks) => {
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508 | if (input.slice(pos + 1, pos + 4) === "!--") return pos + 4;
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509 | return pos + 1;
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510 | };
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511 |
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512 |
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513 | const consumeAt = (input, pos, callbacks) => {
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514 | const start = pos;
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515 | pos++;
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516 | if (pos === input.length) return pos;
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517 | if (_startsIdentifier(input, pos)) {
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518 | pos = _consumeIdentifier(input, pos);
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519 | if (callbacks.atKeyword !== undefined) {
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520 | pos = callbacks.atKeyword(input, start, pos);
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521 | }
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522 | }
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523 | return pos;
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524 | };
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525 |
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526 | const CHAR_MAP = Array.from({ length: 0x80 }, (_, cc) => {
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527 |
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528 | switch (cc) {
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529 | case CC_LINE_FEED:
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530 | case CC_CARRIAGE_RETURN:
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531 | case CC_FORM_FEED:
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532 | case CC_TAB:
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533 | case CC_SPACE:
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534 | return consumeSpace;
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535 | case CC_QUOTATION_MARK:
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536 | case CC_APOSTROPHE:
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537 | return consumeString(cc);
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538 | case CC_NUMBER_SIGN:
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539 | return consumeNumberSign;
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540 | case CC_SLASH:
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541 | return consumePotentialComment;
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542 |
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543 |
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544 |
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545 |
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546 |
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547 | case CC_COMMA:
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548 | return consumeComma;
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549 | case CC_SEMICOLON:
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550 | return consumeSemicolon;
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551 | case CC_LEFT_PARENTHESIS:
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552 | return consumeLeftParenthesis;
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553 | case CC_RIGHT_PARENTHESIS:
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554 | return consumeRightParenthesis;
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555 | case CC_LEFT_CURLY:
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556 | return consumeLeftCurlyBracket;
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557 | case CC_RIGHT_CURLY:
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558 | return consumeRightCurlyBracket;
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559 | case CC_COLON:
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560 | return consumePotentialPseudo;
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561 | case CC_PLUS_SIGN:
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562 | return consumeNumericToken;
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563 | case CC_FULL_STOP:
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564 | return consumeDot;
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565 | case CC_HYPHEN_MINUS:
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566 | return consumeMinus;
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567 | case CC_LESS_THAN_SIGN:
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568 | return consumeLessThan;
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569 | case CC_AT_SIGN:
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570 | return consumeAt;
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571 | case CC_LOWER_U:
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572 | return consumePotentialUrl;
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573 | case CC_LOW_LINE:
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574 | return consumeOtherIdentifier;
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575 | default:
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576 | if (_isDigit(cc)) return consumeNumericToken;
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577 | if (
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578 | (cc >= CC_LOWER_A && cc <= CC_LOWER_Z) ||
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579 | (cc >= CC_UPPER_A && cc <= CC_UPPER_Z)
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580 | ) {
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581 | return consumeOtherIdentifier;
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582 | }
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583 | return consumeSingleCharToken;
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584 | }
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585 | });
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586 |
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587 |
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588 |
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589 |
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590 |
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591 |
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592 | module.exports = (input, callbacks) => {
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593 | let pos = 0;
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594 | while (pos < input.length) {
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595 | const cc = input.charCodeAt(pos);
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596 | if (cc < 0x80) {
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597 | pos = CHAR_MAP[cc](input, pos, callbacks);
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598 | } else {
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599 | pos++;
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600 | }
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601 | }
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602 | };
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603 |
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604 | module.exports.eatComments = (input, pos) => {
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605 | loop: for (;;) {
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606 | const cc = input.charCodeAt(pos);
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607 | if (cc === CC_SLASH) {
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608 | if (pos === input.length) return pos;
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609 | let cc = input.charCodeAt(pos + 1);
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610 | if (cc !== CC_ASTERISK) return pos;
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611 | pos++;
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612 | for (;;) {
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613 | pos++;
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614 | if (pos === input.length) return pos;
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615 | cc = input.charCodeAt(pos);
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616 | while (cc === CC_ASTERISK) {
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617 | pos++;
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618 | if (pos === input.length) return pos;
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619 | cc = input.charCodeAt(pos);
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620 | if (cc === CC_SLASH) {
|
621 | pos++;
|
622 | continue loop;
|
623 | }
|
624 | }
|
625 | }
|
626 | }
|
627 | return pos;
|
628 | }
|
629 | };
|
630 |
|
631 | module.exports.eatWhitespaceAndComments = (input, pos) => {
|
632 | loop: for (;;) {
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633 | const cc = input.charCodeAt(pos);
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634 | if (cc === CC_SLASH) {
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635 | if (pos === input.length) return pos;
|
636 | let cc = input.charCodeAt(pos + 1);
|
637 | if (cc !== CC_ASTERISK) return pos;
|
638 | pos++;
|
639 | for (;;) {
|
640 | pos++;
|
641 | if (pos === input.length) return pos;
|
642 | cc = input.charCodeAt(pos);
|
643 | while (cc === CC_ASTERISK) {
|
644 | pos++;
|
645 | if (pos === input.length) return pos;
|
646 | cc = input.charCodeAt(pos);
|
647 | if (cc === CC_SLASH) {
|
648 | pos++;
|
649 | continue loop;
|
650 | }
|
651 | }
|
652 | }
|
653 | } else if (_isWhiteSpace(cc)) {
|
654 | pos++;
|
655 | continue;
|
656 | }
|
657 | return pos;
|
658 | }
|
659 | };
|