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feat(ivy): properly apply style="", [style], [style.foo] and [attr.st…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| /** | ||
| * @license | ||
| * Copyright Google Inc. All Rights Reserved. | ||
| * | ||
| * Use of this source code is governed by an MIT-style license that can be | ||
| * found in the LICENSE file at https://angular.io/license | ||
| */ | ||
|
|
||
| const enum Char { | ||
| OpenParen = 40, | ||
| CloseParen = 41, | ||
| Colon = 58, | ||
| Semicolon = 59, | ||
| BackSlash = 92, | ||
| QuoteNone = 0, // indicating we are not inside a quote | ||
| QuoteDouble = 34, | ||
| QuoteSingle = 39, | ||
| } | ||
|
|
||
|
|
||
| /** | ||
| * Parses string representation of a style and converts it into object literal. | ||
| * | ||
| * @param value string representation of style as used in the `style` attribute in HTML. | ||
| * Example: `color: red; height: auto`. | ||
| * @returns an object literal. `{ color: 'red', height: 'auto'}`. | ||
| */ | ||
| export function parseStyle(value: string): {[key: string]: any} { | ||
| const styles: {[key: string]: any} = {}; | ||
|
|
||
| let i = 0; | ||
| let parenDepth = 0; | ||
| let quote: Char = Char.QuoteNone; | ||
| let valueStart = 0; | ||
| let propStart = 0; | ||
| let currentProp: string|null = null; | ||
| let valueHasQuotes = false; | ||
| while (i < value.length) { | ||
| const token = value.charCodeAt(i++) as Char; | ||
| switch (token) { | ||
| case Char.OpenParen: | ||
| parenDepth++; | ||
| break; | ||
| case Char.CloseParen: | ||
| parenDepth--; | ||
| break; | ||
| case Char.QuoteSingle: | ||
| // valueStart needs to be there since prop values don't | ||
| // have quotes in CSS | ||
| valueHasQuotes = valueHasQuotes || valueStart > 0; | ||
| if (quote === Char.QuoteNone) { | ||
| quote = Char.QuoteSingle; | ||
| } else if (quote === Char.QuoteSingle && value.charCodeAt(i - 1) !== Char.BackSlash) { | ||
| quote = Char.QuoteNone; | ||
| } | ||
| break; | ||
| case Char.QuoteDouble: | ||
| // same logic as above | ||
| valueHasQuotes = valueHasQuotes || valueStart > 0; | ||
| if (quote === Char.QuoteNone) { | ||
| quote = Char.QuoteDouble; | ||
| } else if (quote === Char.QuoteDouble && value.charCodeAt(i - 1) !== Char.BackSlash) { | ||
| quote = Char.QuoteNone; | ||
| } | ||
| break; | ||
| case Char.Colon: | ||
| if (!currentProp && parenDepth === 0 && quote === Char.QuoteNone) { | ||
| currentProp = hyphenate(value.substring(propStart, i - 1).trim()); | ||
| valueStart = i; | ||
| } | ||
| break; | ||
| case Char.Semicolon: | ||
| if (currentProp && valueStart > 0 && parenDepth === 0 && quote === Char.QuoteNone) { | ||
| const styleVal = value.substring(valueStart, i - 1).trim(); | ||
| styles[currentProp] = valueHasQuotes ? stripUnnecessaryQuotes(styleVal) : styleVal; | ||
| propStart = i; | ||
| valueStart = 0; | ||
| currentProp = null; | ||
| valueHasQuotes = false; | ||
| } | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| if (currentProp && valueStart) { | ||
| const styleVal = value.substr(valueStart).trim(); | ||
| styles[currentProp] = valueHasQuotes ? stripUnnecessaryQuotes(styleVal) : styleVal; | ||
| } | ||
|
|
||
| return styles; | ||
| } | ||
|
|
||
| export function stripUnnecessaryQuotes(value: string): string { | ||
| const qS = value.charCodeAt(0); | ||
| const qE = value.charCodeAt(value.length - 1); | ||
| if (qS == qE && (qS == Char.QuoteSingle || qS == Char.QuoteDouble)) { | ||
| const tempValue = value.substring(1, value.length - 1); | ||
| // special case to avoid using a multi-quoted string that was just chomped | ||
| // (e.g. `font-family: "Verdana", "sans-serif"`) | ||
| if (tempValue.indexOf('\'') == -1 && tempValue.indexOf('"') == -1) { | ||
| value = tempValue; | ||
| } | ||
| } | ||
| return value; | ||
| } | ||
|
|
||
| export function hyphenate(value: string): string { | ||
| return value.replace(/[a-z][A-Z]/g, v => { | ||
| return v.charAt(0) + '-' + v.charAt(1); | ||
| }).toLowerCase(); | ||
| } |
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