1 | /**
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2 | * @license
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3 | * Copyright Google LLC All Rights Reserved.
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4 | *
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5 | * Use of this source code is governed by an MIT-style license that can be
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6 | * found in the LICENSE file at https://angular.io/license
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7 | */
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8 | /**
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9 | * Parses string representation of a style and converts it into object literal.
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10 | *
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11 | * @param value string representation of style as used in the `style` attribute in HTML.
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12 | * Example: `color: red; height: auto`.
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13 | * @returns An array of style property name and value pairs, e.g. `['color', 'red', 'height',
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14 | * 'auto']`
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15 | */
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16 | export function parse(value) {
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17 | // we use a string array here instead of a string map
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18 | // because a string-map is not guaranteed to retain the
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19 | // order of the entries whereas a string array can be
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20 | // constructed in a [key, value, key, value] format.
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21 | const styles = [];
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22 | let i = 0;
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23 | let parenDepth = 0;
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24 | let quote = 0 /* QuoteNone */;
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25 | let valueStart = 0;
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26 | let propStart = 0;
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27 | let currentProp = null;
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28 | let valueHasQuotes = false;
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29 | while (i < value.length) {
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30 | const token = value.charCodeAt(i++);
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31 | switch (token) {
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32 | case 40 /* OpenParen */:
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33 | parenDepth++;
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34 | break;
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35 | case 41 /* CloseParen */:
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36 | parenDepth--;
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37 | break;
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38 | case 39 /* QuoteSingle */:
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39 | // valueStart needs to be there since prop values don't
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40 | // have quotes in CSS
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41 | valueHasQuotes = valueHasQuotes || valueStart > 0;
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42 | if (quote === 0 /* QuoteNone */) {
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43 | quote = 39 /* QuoteSingle */;
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44 | }
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45 | else if (quote === 39 /* QuoteSingle */ && value.charCodeAt(i - 1) !== 92 /* BackSlash */) {
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46 | quote = 0 /* QuoteNone */;
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47 | }
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48 | break;
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49 | case 34 /* QuoteDouble */:
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50 | // same logic as above
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51 | valueHasQuotes = valueHasQuotes || valueStart > 0;
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52 | if (quote === 0 /* QuoteNone */) {
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53 | quote = 34 /* QuoteDouble */;
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54 | }
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55 | else if (quote === 34 /* QuoteDouble */ && value.charCodeAt(i - 1) !== 92 /* BackSlash */) {
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56 | quote = 0 /* QuoteNone */;
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57 | }
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58 | break;
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59 | case 58 /* Colon */:
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60 | if (!currentProp && parenDepth === 0 && quote === 0 /* QuoteNone */) {
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61 | currentProp = hyphenate(value.substring(propStart, i - 1).trim());
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62 | valueStart = i;
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63 | }
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64 | break;
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65 | case 59 /* Semicolon */:
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66 | if (currentProp && valueStart > 0 && parenDepth === 0 && quote === 0 /* QuoteNone */) {
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67 | const styleVal = value.substring(valueStart, i - 1).trim();
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68 | styles.push(currentProp, valueHasQuotes ? stripUnnecessaryQuotes(styleVal) : styleVal);
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69 | propStart = i;
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70 | valueStart = 0;
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71 | currentProp = null;
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72 | valueHasQuotes = false;
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73 | }
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74 | break;
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75 | }
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76 | }
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77 | if (currentProp && valueStart) {
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78 | const styleVal = value.substr(valueStart).trim();
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79 | styles.push(currentProp, valueHasQuotes ? stripUnnecessaryQuotes(styleVal) : styleVal);
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80 | }
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81 | return styles;
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82 | }
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83 | export function stripUnnecessaryQuotes(value) {
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84 | const qS = value.charCodeAt(0);
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85 | const qE = value.charCodeAt(value.length - 1);
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86 | if (qS == qE && (qS == 39 /* QuoteSingle */ || qS == 34 /* QuoteDouble */)) {
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87 | const tempValue = value.substring(1, value.length - 1);
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88 | // special case to avoid using a multi-quoted string that was just chomped
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89 | // (e.g. `font-family: "Verdana", "sans-serif"`)
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90 | if (tempValue.indexOf('\'') == -1 && tempValue.indexOf('"') == -1) {
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91 | value = tempValue;
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92 | }
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93 | }
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94 | return value;
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95 | }
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96 | export function hyphenate(value) {
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97 | return value
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98 | .replace(/[a-z][A-Z]/g, v => {
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99 | return v.charAt(0) + '-' + v.charAt(1);
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100 | })
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101 | .toLowerCase();
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102 | }
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height: auto`.\n * @returns An array of style property name and value pairs, e.g. `['color', 'red', 'height',\n * 'auto']`\n */\nexport function parse(value: string): string[] {\n  // we use a string array here instead of a string map\n  // because a string-map is not guaranteed to retain the\n  // order of the entries whereas a string array can be\n  // constructed in a [key, value, key, value] format.\n  const styles: string[] = [];\n\n  let i = 0;\n  let parenDepth = 0;\n  let quote: Char = Char.QuoteNone;\n  let valueStart = 0;\n  let propStart = 0;\n  let currentProp: string|null = null;\n  let valueHasQuotes = false;\n  while (i < value.length) {\n    const token = value.charCodeAt(i++) as Char;\n    switch (token) {\n      case Char.OpenParen:\n        parenDepth++;\n        break;\n      case Char.CloseParen:\n        parenDepth--;\n        break;\n      case Char.QuoteSingle:\n        // valueStart needs to be there since prop values don't\n        // have quotes in CSS\n        valueHasQuotes = valueHasQuotes || valueStart > 0;\n        if (quote === Char.QuoteNone) {\n          quote = Char.QuoteSingle;\n        } else if (quote === Char.QuoteSingle && value.charCodeAt(i - 1) !== Char.BackSlash) {\n          quote = Char.QuoteNone;\n        }\n        break;\n      case Char.QuoteDouble:\n        // same logic as above\n        valueHasQuotes = valueHasQuotes || valueStart > 0;\n        if (quote === Char.QuoteNone) {\n          quote = Char.QuoteDouble;\n        } else if (quote === Char.QuoteDouble && value.charCodeAt(i - 1) !== Char.BackSlash) {\n          quote = Char.QuoteNone;\n        }\n        break;\n      case Char.Colon:\n        if (!currentProp && parenDepth === 0 && quote === Char.QuoteNone) {\n          currentProp = hyphenate(value.substring(propStart, i - 1).trim());\n          valueStart = i;\n        }\n        break;\n      case Char.Semicolon:\n        if (currentProp && valueStart > 0 && parenDepth === 0 && quote === Char.QuoteNone) {\n          const styleVal = value.substring(valueStart, i - 1).trim();\n          styles.push(currentProp, valueHasQuotes ? stripUnnecessaryQuotes(styleVal) : styleVal);\n          propStart = i;\n          valueStart = 0;\n          currentProp = null;\n          valueHasQuotes = false;\n        }\n        break;\n    }\n  }\n\n  if (currentProp && valueStart) {\n    const styleVal = value.substr(valueStart).trim();\n    styles.push(currentProp, valueHasQuotes ? stripUnnecessaryQuotes(styleVal) : styleVal);\n  }\n\n  return styles;\n}\n\nexport function stripUnnecessaryQuotes(value: string): string {\n  const qS = value.charCodeAt(0);\n  const qE = value.charCodeAt(value.length - 1);\n  if (qS == qE && (qS == Char.QuoteSingle || qS == Char.QuoteDouble)) {\n    const tempValue = value.substring(1, value.length - 1);\n    // special case to avoid using a multi-quoted string that was just chomped\n    // (e.g. `font-family: \"Verdana\", \"sans-serif\"`)\n    if (tempValue.indexOf('\\'') == -1 && tempValue.indexOf('\"') == -1) {\n      value = tempValue;\n    }\n  }\n  return value;\n}\n\nexport function hyphenate(value: string): string {\n  return value\n      .replace(\n          /[a-z][A-Z]/g,\n          v => {\n            return v.charAt(0) + '-' + v.charAt(1);\n          })\n      .toLowerCase();\n}\n"]} |
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