handlebars
Version:
Handlebars provides the power necessary to let you build semantic templates effectively with no frustration
229 lines (192 loc) • 21.6 kB
JavaScript
/* global define, require */
;
exports.__esModule = true;
exports.safeJsonLiteral = safeJsonLiteral;
var _utils = require('../utils');
// Matches any character that quotedString may have to escape: quotes,
// backslashes, control characters, line separators, surrogates and "<". Most
// strings, e.g. lookup names, contain none of them and can skip the escaping.
// eslint-disable-next-line no-control-regex
var NEEDS_ESCAPING = /[\x00-\x1f\\"\u2028\u2029<\ud800-\udfff]/;
// Per HTML "Restrictions for contents of script elements": "<!--", "<script"
// and "</script" can end or change the parsing of an enclosing <script>
// element.
var SCRIPT_DELIMITERS = /<(?=!--|\/?script)/gi;
/**
* Escape the "<" of every sequence that could end or change the parsing of
* an enclosing <script> element.
*
* Only pass JavaScript or JSON code in which "<" can only occur inside string
* literals, where "\u003C" has the same value.
*
* @param {string} code the code to escape
* @returns {string} the escaped code
*/
function escapeScriptDelimiters(code) {
return code.replace(SCRIPT_DELIMITERS, '\\u003C');
}
/**
* Escape a UTF-16 surrogate code unit as a "\uXXXX" escape sequence.
*
* @param {string} surrogate a single surrogate code unit
* @returns {string} the escape sequence
*/
function escapeSurrogate(surrogate) {
return '\\u' + surrogate.charCodeAt(0).toString(16);
}
/**
* Convert a value to a JSON literal that is safe to write into generated
* code: valid in ES5, where line and paragraph separators end string literals,
* encodable as UTF-8 on every engine, and safe inside an enclosing <script>
* element.
*
* @param {*} value the value to convert
* @returns {string} the JavaScript literal
*/
function safeJsonLiteral(value) {
return escapeScriptDelimiters(JSON.stringify(value).replace(/\u2028/g, '\\u2028').replace(/\u2029/g, '\\u2029')
// Engines before ES2019 leave lone surrogates unescaped, and those cannot
// be encoded as UTF-8. Escaping paired ones as well keeps the value.
.replace(/[\ud800-\udfff]/g, escapeSurrogate));
}
var SourceNode = undefined;
try {
/* istanbul ignore next */
if (typeof define !== 'function' || !define.amd) {
// We don't support this in AMD environments. For these environments, we assume that
// they are running on the browser and thus have no need for the source-map library.
var SourceMap = require('source-map');
SourceNode = SourceMap.SourceNode;
}
} catch (err) {}
/* NOP */
/* istanbul ignore if: tested but not covered in istanbul due to dist build */
if (!SourceNode) {
SourceNode = function (line, column, srcFile, chunks) {
this.src = '';
if (chunks) {
this.add(chunks);
}
};
/* istanbul ignore next */
SourceNode.prototype = {
add: function add(chunks) {
if (_utils.isArray(chunks)) {
chunks = chunks.join('');
}
this.src += chunks;
},
prepend: function prepend(chunks) {
if (_utils.isArray(chunks)) {
chunks = chunks.join('');
}
this.src = chunks + this.src;
},
toStringWithSourceMap: function toStringWithSourceMap() {
return { code: this.toString() };
},
toString: function toString() {
return this.src;
}
};
}
function castChunk(chunk, codeGen, loc) {
if (_utils.isArray(chunk)) {
var ret = [];
for (var i = 0, len = chunk.length; i < len; i++) {
ret.push(codeGen.wrap(chunk[i], loc));
}
return ret;
} else if (typeof chunk === 'boolean' || typeof chunk === 'number') {
// Handle primitives that the SourceNode will throw up on
return chunk + '';
}
return chunk;
}
function CodeGen(srcFile) {
this.srcFile = srcFile;
this.source = [];
}
CodeGen.prototype = {
isEmpty: function isEmpty() {
return !this.source.length;
},
prepend: function prepend(source, loc) {
this.source.unshift(this.wrap(source, loc));
},
push: function push(source, loc) {
this.source.push(this.wrap(source, loc));
},
merge: function merge() {
var source = this.empty();
this.each(function (line) {
source.add([' ', line, '\n']);
});
return source;
},
each: function each(iter) {
for (var i = 0, len = this.source.length; i < len; i++) {
iter(this.source[i]);
}
},
empty: function empty() {
var loc = this.currentLocation || { start: {} };
return new SourceNode(loc.start.line, loc.start.column, this.srcFile);
},
wrap: function wrap(chunk) {
var loc = arguments.length <= 1 || arguments[1] === undefined ? this.currentLocation || { start: {} } : arguments[1];
if (chunk instanceof SourceNode) {
return chunk;
}
chunk = castChunk(chunk, this, loc);
return new SourceNode(loc.start.line, loc.start.column, this.srcFile, chunk);
},
functionCall: function functionCall(fn, type, params) {
params = this.generateList(params);
return this.wrap([fn, type ? '.' + type + '(' : '(', params, ')']);
},
quotedString: function quotedString(str) {
str = str + '';
// Fast path: quotedString runs for every lookup name and content string,
// and the chain of replacements below is much slower than a single test.
if (!NEEDS_ESCAPING.test(str)) {
return '"' + str + '"';
}
// JSON.stringify escapes quotes, backslashes and control characters;
// safeJsonLiteral adds line separators, surrogates and script delimiters.
return safeJsonLiteral(str);
},
objectLiteral: function objectLiteral(obj) {
// istanbul ignore next
var _this = this;
var pairs = [];
Object.keys(obj).forEach(function (key) {
var value = castChunk(obj[key], _this);
if (value !== 'undefined') {
pairs.push([_this.quotedString(key), ':', value]);
}
});
var ret = this.generateList(pairs);
ret.prepend('{');
ret.add('}');
return ret;
},
generateList: function generateList(entries) {
var ret = this.empty();
for (var i = 0, len = entries.length; i < len; i++) {
if (i) {
ret.add(',');
}
ret.add(castChunk(entries[i], this));
}
return ret;
},
generateArray: function generateArray(entries) {
var ret = this.generateList(entries);
ret.prepend('[');
ret.add(']');
return ret;
}
};
exports['default'] = CodeGen;
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global define, require */\nimport { isArray } from '../utils';\n\n// Matches any character that quotedString may have to escape: quotes,\n// backslashes, control characters, line separators, surrogates and \"<\". Most\n// strings, e.g. lookup names, contain none of them and can skip the escaping.\n// eslint-disable-next-line no-control-regex\nconst NEEDS_ESCAPING = /[\\x00-\\x1f\\\\\"\\u2028\\u2029<\\ud800-\\udfff]/;\n\n// Per HTML \"Restrictions for contents of script elements\": \"<!--\", \"<script\"\n// and \"</script\" can end or change the parsing of an enclosing <script>\n// element.\nconst SCRIPT_DELIMITERS = /<(?=!--|\\/?script)/gi;\n\n/**\n * Escape the \"<\" of every sequence that could end or change the parsing of\n * an enclosing <script> element.\n *\n * Only pass JavaScript or JSON code in which \"<\" can only occur inside string\n * literals, where \"\\u003C\" has the same value.\n *\n * @param {string} code the code to escape\n * @returns {string} the escaped code\n */\nfunction escapeScriptDelimiters(code) {\n  return code.replace(SCRIPT_DELIMITERS, '\\\\u003C');\n}\n\n/**\n * Escape a UTF-16 surrogate code unit as a \"\\uXXXX\" escape sequence.\n *\n * @param {string} surrogate a single surrogate code unit\n * @returns {string} the escape sequence\n */\nfunction escapeSurrogate(surrogate) {\n  return '\\\\u' + surrogate.charCodeAt(0).toString(16);\n}\n\n/**\n * Convert a value to a JSON literal that is safe to write into generated\n * code: valid in ES5, where line and paragraph separators end string literals,\n * encodable as UTF-8 on every engine, and safe inside an enclosing <script>\n * element.\n *\n * @param {*} value the value to convert\n * @returns {string} the JavaScript literal\n */\nexport function safeJsonLiteral(value) {\n  return escapeScriptDelimiters(\n    JSON.stringify(value)\n      .replace(/\\u2028/g, '\\\\u2028')\n      .replace(/\\u2029/g, '\\\\u2029')\n      // Engines before ES2019 leave lone surrogates unescaped, and those cannot\n      // be encoded as UTF-8. Escaping paired ones as well keeps the value.\n      .replace(/[\\ud800-\\udfff]/g, escapeSurrogate)\n  );\n}\n\nlet SourceNode;\n\ntry {\n  /* istanbul ignore next */\n  if (typeof define !== 'function' || !define.amd) {\n    // We don't support this in AMD environments. For these environments, we assume that\n    // they are running on the browser and thus have no need for the source-map library.\n    let SourceMap = require('source-map');\n    SourceNode = SourceMap.SourceNode;\n  }\n} catch (err) {\n  /* NOP */\n}\n\n/* istanbul ignore if: tested but not covered in istanbul due to dist build  */\nif (!SourceNode) {\n  SourceNode = function(line, column, srcFile, chunks) {\n    this.src = '';\n    if (chunks) {\n      this.add(chunks);\n    }\n  };\n  /* istanbul ignore next */\n  SourceNode.prototype = {\n    add: function(chunks) {\n      if (isArray(chunks)) {\n        chunks = chunks.join('');\n      }\n      this.src += chunks;\n    },\n    prepend: function(chunks) {\n      if (isArray(chunks)) {\n        chunks = chunks.join('');\n      }\n      this.src = chunks + this.src;\n    },\n    toStringWithSourceMap: function() {\n      return { code: this.toString() };\n    },\n    toString: function() {\n      return this.src;\n    }\n  };\n}\n\nfunction castChunk(chunk, codeGen, loc) {\n  if (isArray(chunk)) {\n    let ret = [];\n\n    for (let i = 0, len = chunk.length; i < len; i++) {\n      ret.push(codeGen.wrap(chunk[i], loc));\n    }\n    return ret;\n  } else if (typeof chunk === 'boolean' || typeof chunk === 'number') {\n    // Handle primitives that the SourceNode will throw up on\n    return chunk + '';\n  }\n  return chunk;\n}\n\nfunction CodeGen(srcFile) {\n  this.srcFile = srcFile;\n  this.source = [];\n}\n\nCodeGen.prototype = {\n  isEmpty() {\n    return !this.source.length;\n  },\n  prepend: function(source, loc) {\n    this.source.unshift(this.wrap(source, loc));\n  },\n  push: function(source, loc) {\n    this.source.push(this.wrap(source, loc));\n  },\n\n  merge: function() {\n    let source = this.empty();\n    this.each(function(line) {\n      source.add(['  ', line, '\\n']);\n    });\n    return source;\n  },\n\n  each: function(iter) {\n    for (let i = 0, len = this.source.length; i < len; i++) {\n      iter(this.source[i]);\n    }\n  },\n\n  empty: function() {\n    let loc = this.currentLocation || { start: {} };\n    return new SourceNode(loc.start.line, loc.start.column, this.srcFile);\n  },\n  wrap: function(chunk, loc = this.currentLocation || { start: {} }) {\n    if (chunk instanceof SourceNode) {\n      return chunk;\n    }\n\n    chunk = castChunk(chunk, this, loc);\n\n    return new SourceNode(\n      loc.start.line,\n      loc.start.column,\n      this.srcFile,\n      chunk\n    );\n  },\n\n  functionCall: function(fn, type, params) {\n    params = this.generateList(params);\n    return this.wrap([fn, type ? '.' + type + '(' : '(', params, ')']);\n  },\n\n  quotedString: function(str) {\n    str = str + '';\n    // Fast path: quotedString runs for every lookup name and content string,\n    // and the chain of replacements below is much slower than a single test.\n    if (!NEEDS_ESCAPING.test(str)) {\n      return '\"' + str + '\"';\n    }\n\n    // JSON.stringify escapes quotes, backslashes and control characters;\n    // safeJsonLiteral adds line separators, surrogates and script delimiters.\n    return safeJsonLiteral(str);\n  },\n\n  objectLiteral: function(obj) {\n    let pairs = [];\n\n    Object.keys(obj).forEach(key => {\n      let value = castChunk(obj[key], this);\n      if (value !== 'undefined') {\n        pairs.push([this.quotedString(key), ':', value]);\n      }\n    });\n\n    let ret = this.generateList(pairs);\n    ret.prepend('{');\n    ret.add('}');\n    return ret;\n  },\n\n  generateList: function(entries) {\n    let ret = this.empty();\n\n    for (let i = 0, len = entries.length; i < len; i++) {\n      if (i) {\n        ret.add(',');\n      }\n\n      ret.add(castChunk(entries[i], this));\n    }\n\n    return ret;\n  },\n\n  generateArray: function(entries) {\n    let ret = this.generateList(entries);\n    ret.prepend('[');\n    ret.add(']');\n\n    return ret;\n  }\n};\n\nexport default CodeGen;\n"]}