src/vs/base/common/jsonc.ts

64 LOC · 64 covered · 0 uncovered · 13 ranges · 12 concepts · 10 introducers · 13 tests

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  /*---------------------------------------------------------------------------------------------
  
jsonc.ts ×3

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   *  Copyright (c) Microsoft Corporation. All rights reserved.
  
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   *  Licensed under the MIT License. See License.txt in the project root for license information.
  
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   *--------------------------------------------------------------------------------------------*/
  
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  // First group matches a double quoted string
  
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  // Second group matches a single quoted string
  
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  // Third group matches a multi line comment
  
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  // Forth group matches a single line comment
  
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  // Fifth group matches a trailing comma
  
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  const regexp = /("[^"\\]*(?:\\.[^"\\]*)*")|('[^'\\]*(?:\\.[^'\\]*)*')|(\/\*[^\/\*]*(?:(?:\*|\/)[^\/\*]*)*?\*\/)|(\/{2,}.*?(?:(?:\r?\n)|$))|(,\s*[}\]])/g;
  
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  /**
  
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   * Strips single and multi line JavaScript comments from JSON
  
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   * content. Ignores characters in strings BUT doesn't support
  
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   * string continuation across multiple lines since it is not
  
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   * supported in JSON.
  
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   *
  
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   * @param content the content to strip comments from
  
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   * @returns the content without comments
  
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  */
  
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  export function stripComments(content: string): string {
  
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  	return content.replace(regexp, function (match, _m1, _m2, m3, m4, m5) {
  
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  		// Only one of m1, m2, m3, m4, m5 matches
  
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  		if (m3) {
  
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  			// A block comment. Replace with nothing
  
jsonc.ts ×1

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  			return '';
  
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  		} else if (m4) {
  
jsonc.ts ×3

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  			// Since m4 is a single line comment is is at least of length 2 (e.g. //)
  
jsonc.ts ×1

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  			// If it ends in \r?\n then keep it.
  
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  			const length = m4.length;
  
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  			if (m4[length - 1] === '\n') {
  
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  				return m4[length - 2] === '\r' ? '\r\n' : '\n';
  
jsonc.ts ×1

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  			}
  
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  			else {
  
jsonc.ts ×1

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  				return '';
  
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  			}
  
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  		} else if (m5) {
  
jsonc.ts ×1

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  			// Remove the trailing comma
  
jsonc.ts ×1

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  			return match.substring(1);
  
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  		} else {
  
jsonc.ts ×1

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  			// We match a string
  
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  			return match;
  
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  		}
  
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  	});
  
jsonc.ts ×3

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  }
  
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  /**
  
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   * A drop-in replacement for JSON.parse that can parse
  
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   * JSON with comments and trailing commas.
  
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   *
  
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   * @param content the content to strip comments from
  
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   * @returns the parsed content as JSON
  
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  */
  
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  export function parse<T>(content: string): T {
  
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  	const commentsStripped = stripComments(content);
  
jsonc.ts ×2

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  	try {
  
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  		return JSON.parse(commentsStripped);
  
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  	} catch (error) {
  
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  		const trailingCommasStriped = commentsStripped.replace(/,\s*([}\]])/g, '$1');
  
jsonc.ts ×1

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  		return JSON.parse(trailingCommasStriped);
  
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  	}
  
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  }
  
jsonc.ts ×2