From d8175ff498b2f4b1bf4af87b802380eb3a86c338 Mon Sep 17 00:00:00 2001 From: Phillip Johnsen Date: Mon, 7 Oct 2019 15:00:58 +0200 Subject: [PATCH] Turn source code into a plain ES module without UMD wrapper As part of transition the source code to be a proper plain ES module, we're removing the handcrafted UMD wrapper around the source code. This means the UMD wrapper will have to come from elsewhere; a build step introduced later. --- mustache.mjs | 1270 +++++++++++++++++++++++++------------------------- 1 file changed, 629 insertions(+), 641 deletions(-) diff --git a/mustache.mjs b/mustache.mjs index 3182540..2081c98 100644 --- a/mustache.mjs +++ b/mustache.mjs @@ -3,719 +3,707 @@ * http://github.com/janl/mustache.js */ -/*global define: false Mustache: true*/ +var objectToString = Object.prototype.toString; +var isArray = Array.isArray || function isArrayPolyfill (object) { + return objectToString.call(object) === '[object Array]'; +}; + +function isFunction (object) { + return typeof object === 'function'; +} + +/** + * More correct typeof string handling array + * which normally returns typeof 'object' + */ +function typeStr (obj) { + return isArray(obj) ? 'array' : typeof obj; +} -(function defineMustache (global, factory) { - if (typeof exports === 'object' && exports && typeof exports.nodeName !== 'string') { - factory(exports); // CommonJS - } else if (typeof define === 'function' && define.amd) { - define(['exports'], factory); // AMD - } else { - global.Mustache = {}; - factory(global.Mustache); // script, wsh, asp - } -}(this, function mustacheFactory (mustache) { +function escapeRegExp (string) { + return string.replace(/[\-\[\]{}()*+?.,\\\^$|#\s]/g, '\\$&'); +} - var objectToString = Object.prototype.toString; - var isArray = Array.isArray || function isArrayPolyfill (object) { - return objectToString.call(object) === '[object Array]'; - }; +/** + * Null safe way of checking whether or not an object, + * including its prototype, has a given property + */ +function hasProperty (obj, propName) { + return obj != null && typeof obj === 'object' && (propName in obj); +} - function isFunction (object) { - return typeof object === 'function'; - } +/** + * Safe way of detecting whether or not the given thing is a primitive and + * whether it has the given property + */ +function primitiveHasOwnProperty (primitive, propName) { + return ( + primitive != null + && typeof primitive !== 'object' + && primitive.hasOwnProperty + && primitive.hasOwnProperty(propName) + ); +} + +// Workaround for https://issues.apache.org/jira/browse/COUCHDB-577 +// See https://github.com/janl/mustache.js/issues/189 +var regExpTest = RegExp.prototype.test; +function testRegExp (re, string) { + return regExpTest.call(re, string); +} + +var nonSpaceRe = /\S/; +function isWhitespace (string) { + return !testRegExp(nonSpaceRe, string); +} + +var entityMap = { + '&': '&', + '<': '<', + '>': '>', + '"': '"', + "'": ''', + '/': '/', + '`': '`', + '=': '=' +}; + +function escapeHtml (string) { + return String(string).replace(/[&<>"'`=\/]/g, function fromEntityMap (s) { + return entityMap[s]; + }); +} + +var whiteRe = /\s*/; +var spaceRe = /\s+/; +var equalsRe = /\s*=/; +var curlyRe = /\s*\}/; +var tagRe = /#|\^|\/|>|\{|&|=|!/; + +/** + * Breaks up the given `template` string into a tree of tokens. If the `tags` + * argument is given here it must be an array with two string values: the + * opening and closing tags used in the template (e.g. [ "<%", "%>" ]). Of + * course, the default is to use mustaches (i.e. mustache.tags). + * + * A token is an array with at least 4 elements. The first element is the + * mustache symbol that was used inside the tag, e.g. "#" or "&". If the tag + * did not contain a symbol (i.e. {{myValue}}) this element is "name". For + * all text that appears outside a symbol this element is "text". + * + * The second element of a token is its "value". For mustache tags this is + * whatever else was inside the tag besides the opening symbol. For text tokens + * this is the text itself. + * + * The third and fourth elements of the token are the start and end indices, + * respectively, of the token in the original template. + * + * Tokens that are the root node of a subtree contain two more elements: 1) an + * array of tokens in the subtree and 2) the index in the original template at + * which the closing tag for that section begins. + * + * Tokens for partials also contain two more elements: 1) a string value of + * indendation prior to that tag and 2) the index of that tag on that line - + * eg a value of 2 indicates the partial is the third tag on this line. + */ +function parseTemplate (template, tags) { + if (!template) + return []; + var lineHasNonSpace = false; + var sections = []; // Stack to hold section tokens + var tokens = []; // Buffer to hold the tokens + var spaces = []; // Indices of whitespace tokens on the current line + var hasTag = false; // Is there a {{tag}} on the current line? + var nonSpace = false; // Is there a non-space char on the current line? + var indentation = ''; // Tracks indentation for tags that use it + var tagIndex = 0; // Stores a count of number of tags encountered on a line + + // Strips all whitespace tokens array for the current line + // if there was a {{#tag}} on it and otherwise only space. + function stripSpace () { + if (hasTag && !nonSpace) { + while (spaces.length) + delete tokens[spaces.pop()]; + } else { + spaces = []; + } - /** - * More correct typeof string handling array - * which normally returns typeof 'object' - */ - function typeStr (obj) { - return isArray(obj) ? 'array' : typeof obj; + hasTag = false; + nonSpace = false; } - function escapeRegExp (string) { - return string.replace(/[\-\[\]{}()*+?.,\\\^$|#\s]/g, '\\$&'); - } + var openingTagRe, closingTagRe, closingCurlyRe; + function compileTags (tagsToCompile) { + if (typeof tagsToCompile === 'string') + tagsToCompile = tagsToCompile.split(spaceRe, 2); - /** - * Null safe way of checking whether or not an object, - * including its prototype, has a given property - */ - function hasProperty (obj, propName) { - return obj != null && typeof obj === 'object' && (propName in obj); - } + if (!isArray(tagsToCompile) || tagsToCompile.length !== 2) + throw new Error('Invalid tags: ' + tagsToCompile); - /** - * Safe way of detecting whether or not the given thing is a primitive and - * whether it has the given property - */ - function primitiveHasOwnProperty (primitive, propName) { - return ( - primitive != null - && typeof primitive !== 'object' - && primitive.hasOwnProperty - && primitive.hasOwnProperty(propName) - ); + openingTagRe = new RegExp(escapeRegExp(tagsToCompile[0]) + '\\s*'); + closingTagRe = new RegExp('\\s*' + escapeRegExp(tagsToCompile[1])); + closingCurlyRe = new RegExp('\\s*' + escapeRegExp('}' + tagsToCompile[1])); } - // Workaround for https://issues.apache.org/jira/browse/COUCHDB-577 - // See https://github.com/janl/mustache.js/issues/189 - var regExpTest = RegExp.prototype.test; - function testRegExp (re, string) { - return regExpTest.call(re, string); - } + compileTags(tags || mustache.tags); - var nonSpaceRe = /\S/; - function isWhitespace (string) { - return !testRegExp(nonSpaceRe, string); - } + var scanner = new Scanner(template); - var entityMap = { - '&': '&', - '<': '<', - '>': '>', - '"': '"', - "'": ''', - '/': '/', - '`': '`', - '=': '=' - }; - - function escapeHtml (string) { - return String(string).replace(/[&<>"'`=\/]/g, function fromEntityMap (s) { - return entityMap[s]; - }); - } + var start, type, value, chr, token, openSection; + while (!scanner.eos()) { + start = scanner.pos; - var whiteRe = /\s*/; - var spaceRe = /\s+/; - var equalsRe = /\s*=/; - var curlyRe = /\s*\}/; - var tagRe = /#|\^|\/|>|\{|&|=|!/; - - /** - * Breaks up the given `template` string into a tree of tokens. If the `tags` - * argument is given here it must be an array with two string values: the - * opening and closing tags used in the template (e.g. [ "<%", "%>" ]). Of - * course, the default is to use mustaches (i.e. mustache.tags). - * - * A token is an array with at least 4 elements. The first element is the - * mustache symbol that was used inside the tag, e.g. "#" or "&". If the tag - * did not contain a symbol (i.e. {{myValue}}) this element is "name". For - * all text that appears outside a symbol this element is "text". - * - * The second element of a token is its "value". For mustache tags this is - * whatever else was inside the tag besides the opening symbol. For text tokens - * this is the text itself. - * - * The third and fourth elements of the token are the start and end indices, - * respectively, of the token in the original template. - * - * Tokens that are the root node of a subtree contain two more elements: 1) an - * array of tokens in the subtree and 2) the index in the original template at - * which the closing tag for that section begins. - * - * Tokens for partials also contain two more elements: 1) a string value of - * indendation prior to that tag and 2) the index of that tag on that line - - * eg a value of 2 indicates the partial is the third tag on this line. - */ - function parseTemplate (template, tags) { - if (!template) - return []; - var lineHasNonSpace = false; - var sections = []; // Stack to hold section tokens - var tokens = []; // Buffer to hold the tokens - var spaces = []; // Indices of whitespace tokens on the current line - var hasTag = false; // Is there a {{tag}} on the current line? - var nonSpace = false; // Is there a non-space char on the current line? - var indentation = ''; // Tracks indentation for tags that use it - var tagIndex = 0; // Stores a count of number of tags encountered on a line - - // Strips all whitespace tokens array for the current line - // if there was a {{#tag}} on it and otherwise only space. - function stripSpace () { - if (hasTag && !nonSpace) { - while (spaces.length) - delete tokens[spaces.pop()]; - } else { - spaces = []; - } + // Match any text between tags. + value = scanner.scanUntil(openingTagRe); - hasTag = false; - nonSpace = false; - } + if (value) { + for (var i = 0, valueLength = value.length; i < valueLength; ++i) { + chr = value.charAt(i); - var openingTagRe, closingTagRe, closingCurlyRe; - function compileTags (tagsToCompile) { - if (typeof tagsToCompile === 'string') - tagsToCompile = tagsToCompile.split(spaceRe, 2); + if (isWhitespace(chr)) { + spaces.push(tokens.length); + indentation += chr; + } else { + nonSpace = true; + lineHasNonSpace = true; + indentation += ' '; + } - if (!isArray(tagsToCompile) || tagsToCompile.length !== 2) - throw new Error('Invalid tags: ' + tagsToCompile); + tokens.push([ 'text', chr, start, start + 1 ]); + start += 1; - openingTagRe = new RegExp(escapeRegExp(tagsToCompile[0]) + '\\s*'); - closingTagRe = new RegExp('\\s*' + escapeRegExp(tagsToCompile[1])); - closingCurlyRe = new RegExp('\\s*' + escapeRegExp('}' + tagsToCompile[1])); + // Check for whitespace on the current line. + if (chr === '\n') { + stripSpace(); + indentation = ''; + tagIndex = 0; + lineHasNonSpace = false; + } + } } - compileTags(tags || mustache.tags); + // Match the opening tag. + if (!scanner.scan(openingTagRe)) + break; + + hasTag = true; + + // Get the tag type. + type = scanner.scan(tagRe) || 'name'; + scanner.scan(whiteRe); + + // Get the tag value. + if (type === '=') { + value = scanner.scanUntil(equalsRe); + scanner.scan(equalsRe); + scanner.scanUntil(closingTagRe); + } else if (type === '{') { + value = scanner.scanUntil(closingCurlyRe); + scanner.scan(curlyRe); + scanner.scanUntil(closingTagRe); + type = '&'; + } else { + value = scanner.scanUntil(closingTagRe); + } - var scanner = new Scanner(template); + // Match the closing tag. + if (!scanner.scan(closingTagRe)) + throw new Error('Unclosed tag at ' + scanner.pos); - var start, type, value, chr, token, openSection; - while (!scanner.eos()) { - start = scanner.pos; + if (type == '>') { + token = [ type, value, start, scanner.pos, indentation, tagIndex, lineHasNonSpace ]; + } else { + token = [ type, value, start, scanner.pos ]; + } + tagIndex++; + tokens.push(token); + + if (type === '#' || type === '^') { + sections.push(token); + } else if (type === '/') { + // Check section nesting. + openSection = sections.pop(); + + if (!openSection) + throw new Error('Unopened section "' + value + '" at ' + start); + + if (openSection[1] !== value) + throw new Error('Unclosed section "' + openSection[1] + '" at ' + start); + } else if (type === 'name' || type === '{' || type === '&') { + nonSpace = true; + } else if (type === '=') { + // Set the tags for the next time around. + compileTags(value); + } + } - // Match any text between tags. - value = scanner.scanUntil(openingTagRe); + stripSpace(); - if (value) { - for (var i = 0, valueLength = value.length; i < valueLength; ++i) { - chr = value.charAt(i); + // Make sure there are no open sections when we're done. + openSection = sections.pop(); - if (isWhitespace(chr)) { - spaces.push(tokens.length); - indentation += chr; - } else { - nonSpace = true; - lineHasNonSpace = true; - indentation += ' '; - } + if (openSection) + throw new Error('Unclosed section "' + openSection[1] + '" at ' + scanner.pos); - tokens.push([ 'text', chr, start, start + 1 ]); - start += 1; + return nestTokens(squashTokens(tokens)); +} - // Check for whitespace on the current line. - if (chr === '\n') { - stripSpace(); - indentation = ''; - tagIndex = 0; - lineHasNonSpace = false; - } - } - } +/** + * Combines the values of consecutive text tokens in the given `tokens` array + * to a single token. + */ +function squashTokens (tokens) { + var squashedTokens = []; - // Match the opening tag. - if (!scanner.scan(openingTagRe)) - break; + var token, lastToken; + for (var i = 0, numTokens = tokens.length; i < numTokens; ++i) { + token = tokens[i]; - hasTag = true; - - // Get the tag type. - type = scanner.scan(tagRe) || 'name'; - scanner.scan(whiteRe); - - // Get the tag value. - if (type === '=') { - value = scanner.scanUntil(equalsRe); - scanner.scan(equalsRe); - scanner.scanUntil(closingTagRe); - } else if (type === '{') { - value = scanner.scanUntil(closingCurlyRe); - scanner.scan(curlyRe); - scanner.scanUntil(closingTagRe); - type = '&'; + if (token) { + if (token[0] === 'text' && lastToken && lastToken[0] === 'text') { + lastToken[1] += token[1]; + lastToken[3] = token[3]; } else { - value = scanner.scanUntil(closingTagRe); + squashedTokens.push(token); + lastToken = token; } + } + } - // Match the closing tag. - if (!scanner.scan(closingTagRe)) - throw new Error('Unclosed tag at ' + scanner.pos); - - if (type == '>') { - token = [ type, value, start, scanner.pos, indentation, tagIndex, lineHasNonSpace ]; - } else { - token = [ type, value, start, scanner.pos ]; - } - tagIndex++; - tokens.push(token); + return squashedTokens; +} - if (type === '#' || type === '^') { +/** + * Forms the given array of `tokens` into a nested tree structure where + * tokens that represent a section have two additional items: 1) an array of + * all tokens that appear in that section and 2) the index in the original + * template that represents the end of that section. + */ +function nestTokens (tokens) { + var nestedTokens = []; + var collector = nestedTokens; + var sections = []; + + var token, section; + for (var i = 0, numTokens = tokens.length; i < numTokens; ++i) { + token = tokens[i]; + + switch (token[0]) { + case '#': + case '^': + collector.push(token); sections.push(token); - } else if (type === '/') { - // Check section nesting. - openSection = sections.pop(); - - if (!openSection) - throw new Error('Unopened section "' + value + '" at ' + start); - - if (openSection[1] !== value) - throw new Error('Unclosed section "' + openSection[1] + '" at ' + start); - } else if (type === 'name' || type === '{' || type === '&') { - nonSpace = true; - } else if (type === '=') { - // Set the tags for the next time around. - compileTags(value); - } + collector = token[4] = []; + break; + case '/': + section = sections.pop(); + section[5] = token[2]; + collector = sections.length > 0 ? sections[sections.length - 1][4] : nestedTokens; + break; + default: + collector.push(token); } + } - stripSpace(); + return nestedTokens; +} - // Make sure there are no open sections when we're done. - openSection = sections.pop(); +/** + * A simple string scanner that is used by the template parser to find + * tokens in template strings. + */ +function Scanner (string) { + this.string = string; + this.tail = string; + this.pos = 0; +} + +/** + * Returns `true` if the tail is empty (end of string). + */ +Scanner.prototype.eos = function eos () { + return this.tail === ''; +}; - if (openSection) - throw new Error('Unclosed section "' + openSection[1] + '" at ' + scanner.pos); +/** + * Tries to match the given regular expression at the current position. + * Returns the matched text if it can match, the empty string otherwise. + */ +Scanner.prototype.scan = function scan (re) { + var match = this.tail.match(re); - return nestTokens(squashTokens(tokens)); - } + if (!match || match.index !== 0) + return ''; - /** - * Combines the values of consecutive text tokens in the given `tokens` array - * to a single token. - */ - function squashTokens (tokens) { - var squashedTokens = []; - - var token, lastToken; - for (var i = 0, numTokens = tokens.length; i < numTokens; ++i) { - token = tokens[i]; - - if (token) { - if (token[0] === 'text' && lastToken && lastToken[0] === 'text') { - lastToken[1] += token[1]; - lastToken[3] = token[3]; - } else { - squashedTokens.push(token); - lastToken = token; - } - } - } + var string = match[0]; - return squashedTokens; - } + this.tail = this.tail.substring(string.length); + this.pos += string.length; - /** - * Forms the given array of `tokens` into a nested tree structure where - * tokens that represent a section have two additional items: 1) an array of - * all tokens that appear in that section and 2) the index in the original - * template that represents the end of that section. - */ - function nestTokens (tokens) { - var nestedTokens = []; - var collector = nestedTokens; - var sections = []; - - var token, section; - for (var i = 0, numTokens = tokens.length; i < numTokens; ++i) { - token = tokens[i]; - - switch (token[0]) { - case '#': - case '^': - collector.push(token); - sections.push(token); - collector = token[4] = []; - break; - case '/': - section = sections.pop(); - section[5] = token[2]; - collector = sections.length > 0 ? sections[sections.length - 1][4] : nestedTokens; - break; - default: - collector.push(token); - } - } + return string; +}; - return nestedTokens; +/** + * Skips all text until the given regular expression can be matched. Returns + * the skipped string, which is the entire tail if no match can be made. + */ +Scanner.prototype.scanUntil = function scanUntil (re) { + var index = this.tail.search(re), match; + + switch (index) { + case -1: + match = this.tail; + this.tail = ''; + break; + case 0: + match = ''; + break; + default: + match = this.tail.substring(0, index); + this.tail = this.tail.substring(index); } - /** - * A simple string scanner that is used by the template parser to find - * tokens in template strings. - */ - function Scanner (string) { - this.string = string; - this.tail = string; - this.pos = 0; - } + this.pos += match.length; - /** - * Returns `true` if the tail is empty (end of string). - */ - Scanner.prototype.eos = function eos () { - return this.tail === ''; - }; - - /** - * Tries to match the given regular expression at the current position. - * Returns the matched text if it can match, the empty string otherwise. - */ - Scanner.prototype.scan = function scan (re) { - var match = this.tail.match(re); - - if (!match || match.index !== 0) - return ''; - - var string = match[0]; - - this.tail = this.tail.substring(string.length); - this.pos += string.length; - - return string; - }; - - /** - * Skips all text until the given regular expression can be matched. Returns - * the skipped string, which is the entire tail if no match can be made. - */ - Scanner.prototype.scanUntil = function scanUntil (re) { - var index = this.tail.search(re), match; - - switch (index) { - case -1: - match = this.tail; - this.tail = ''; - break; - case 0: - match = ''; - break; - default: - match = this.tail.substring(0, index); - this.tail = this.tail.substring(index); - } - - this.pos += match.length; + return match; +}; - return match; - }; - - /** - * Represents a rendering context by wrapping a view object and - * maintaining a reference to the parent context. - */ - function Context (view, parentContext) { - this.view = view; - this.cache = { '.': this.view }; - this.parent = parentContext; - } +/** + * Represents a rendering context by wrapping a view object and + * maintaining a reference to the parent context. + */ +function Context (view, parentContext) { + this.view = view; + this.cache = { '.': this.view }; + this.parent = parentContext; +} + +/** + * Creates a new context using the given view with this context + * as the parent. + */ +Context.prototype.push = function push (view) { + return new Context(view, this); +}; - /** - * Creates a new context using the given view with this context - * as the parent. - */ - Context.prototype.push = function push (view) { - return new Context(view, this); - }; - - /** - * Returns the value of the given name in this context, traversing - * up the context hierarchy if the value is absent in this context's view. - */ - Context.prototype.lookup = function lookup (name) { - var cache = this.cache; - - var value; - if (cache.hasOwnProperty(name)) { - value = cache[name]; - } else { - var context = this, intermediateValue, names, index, lookupHit = false; - - while (context) { - if (name.indexOf('.') > 0) { - intermediateValue = context.view; - names = name.split('.'); - index = 0; - - /** - * Using the dot notion path in `name`, we descend through the - * nested objects. - * - * To be certain that the lookup has been successful, we have to - * check if the last object in the path actually has the property - * we are looking for. We store the result in `lookupHit`. - * - * This is specially necessary for when the value has been set to - * `undefined` and we want to avoid looking up parent contexts. - * - * In the case where dot notation is used, we consider the lookup - * to be successful even if the last "object" in the path is - * not actually an object but a primitive (e.g., a string, or an - * integer), because it is sometimes useful to access a property - * of an autoboxed primitive, such as the length of a string. - **/ - while (intermediateValue != null && index < names.length) { - if (index === names.length - 1) - lookupHit = ( - hasProperty(intermediateValue, names[index]) - || primitiveHasOwnProperty(intermediateValue, names[index]) - ); - - intermediateValue = intermediateValue[names[index++]]; - } - } else { - intermediateValue = context.view[name]; - - /** - * Only checking against `hasProperty`, which always returns `false` if - * `context.view` is not an object. Deliberately omitting the check - * against `primitiveHasOwnProperty` if dot notation is not used. - * - * Consider this example: - * ``` - * Mustache.render("The length of a football field is {{#length}}{{length}}{{/length}}.", {length: "100 yards"}) - * ``` - * - * If we were to check also against `primitiveHasOwnProperty`, as we do - * in the dot notation case, then render call would return: - * - * "The length of a football field is 9." - * - * rather than the expected: - * - * "The length of a football field is 100 yards." - **/ - lookupHit = hasProperty(context.view, name); - } +/** + * Returns the value of the given name in this context, traversing + * up the context hierarchy if the value is absent in this context's view. + */ +Context.prototype.lookup = function lookup (name) { + var cache = this.cache; - if (lookupHit) { - value = intermediateValue; - break; + var value; + if (cache.hasOwnProperty(name)) { + value = cache[name]; + } else { + var context = this, intermediateValue, names, index, lookupHit = false; + + while (context) { + if (name.indexOf('.') > 0) { + intermediateValue = context.view; + names = name.split('.'); + index = 0; + + /** + * Using the dot notion path in `name`, we descend through the + * nested objects. + * + * To be certain that the lookup has been successful, we have to + * check if the last object in the path actually has the property + * we are looking for. We store the result in `lookupHit`. + * + * This is specially necessary for when the value has been set to + * `undefined` and we want to avoid looking up parent contexts. + * + * In the case where dot notation is used, we consider the lookup + * to be successful even if the last "object" in the path is + * not actually an object but a primitive (e.g., a string, or an + * integer), because it is sometimes useful to access a property + * of an autoboxed primitive, such as the length of a string. + **/ + while (intermediateValue != null && index < names.length) { + if (index === names.length - 1) + lookupHit = ( + hasProperty(intermediateValue, names[index]) + || primitiveHasOwnProperty(intermediateValue, names[index]) + ); + + intermediateValue = intermediateValue[names[index++]]; } + } else { + intermediateValue = context.view[name]; + + /** + * Only checking against `hasProperty`, which always returns `false` if + * `context.view` is not an object. Deliberately omitting the check + * against `primitiveHasOwnProperty` if dot notation is not used. + * + * Consider this example: + * ``` + * Mustache.render("The length of a football field is {{#length}}{{length}}{{/length}}.", {length: "100 yards"}) + * ``` + * + * If we were to check also against `primitiveHasOwnProperty`, as we do + * in the dot notation case, then render call would return: + * + * "The length of a football field is 9." + * + * rather than the expected: + * + * "The length of a football field is 100 yards." + **/ + lookupHit = hasProperty(context.view, name); + } - context = context.parent; + if (lookupHit) { + value = intermediateValue; + break; } - cache[name] = value; + context = context.parent; } - if (isFunction(value)) - value = value.call(this.view); - - return value; - }; - - /** - * A Writer knows how to take a stream of tokens and render them to a - * string, given a context. It also maintains a cache of templates to - * avoid the need to parse the same template twice. - */ - function Writer () { - this.cache = {}; + cache[name] = value; } - /** - * Clears all cached templates in this writer. - */ - Writer.prototype.clearCache = function clearCache () { - this.cache = {}; - }; - - /** - * Parses and caches the given `template` according to the given `tags` or - * `mustache.tags` if `tags` is omitted, and returns the array of tokens - * that is generated from the parse. - */ - Writer.prototype.parse = function parse (template, tags) { - var cache = this.cache; - var cacheKey = template + ':' + (tags || mustache.tags).join(':'); - var tokens = cache[cacheKey]; - - if (tokens == null) - tokens = cache[cacheKey] = parseTemplate(template, tags); - - return tokens; - }; - - /** - * High-level method that is used to render the given `template` with - * the given `view`. - * - * The optional `partials` argument may be an object that contains the - * names and templates of partials that are used in the template. It may - * also be a function that is used to load partial templates on the fly - * that takes a single argument: the name of the partial. - * - * If the optional `tags` argument is given here it must be an array with two - * string values: the opening and closing tags used in the template (e.g. - * [ "<%", "%>" ]). The default is to mustache.tags. - */ - Writer.prototype.render = function render (template, view, partials, tags) { - var tokens = this.parse(template, tags); - var context = (view instanceof Context) ? view : new Context(view); - return this.renderTokens(tokens, context, partials, template, tags); - }; - - /** - * Low-level method that renders the given array of `tokens` using - * the given `context` and `partials`. - * - * Note: The `originalTemplate` is only ever used to extract the portion - * of the original template that was contained in a higher-order section. - * If the template doesn't use higher-order sections, this argument may - * be omitted. - */ - Writer.prototype.renderTokens = function renderTokens (tokens, context, partials, originalTemplate, tags) { - var buffer = ''; - - var token, symbol, value; - for (var i = 0, numTokens = tokens.length; i < numTokens; ++i) { - value = undefined; - token = tokens[i]; - symbol = token[0]; - - if (symbol === '#') value = this.renderSection(token, context, partials, originalTemplate); - else if (symbol === '^') value = this.renderInverted(token, context, partials, originalTemplate); - else if (symbol === '>') value = this.renderPartial(token, context, partials, tags); - else if (symbol === '&') value = this.unescapedValue(token, context); - else if (symbol === 'name') value = this.escapedValue(token, context); - else if (symbol === 'text') value = this.rawValue(token); - - if (value !== undefined) - buffer += value; - } + if (isFunction(value)) + value = value.call(this.view); - return buffer; - }; + return value; +}; - Writer.prototype.renderSection = function renderSection (token, context, partials, originalTemplate) { - var self = this; - var buffer = ''; - var value = context.lookup(token[1]); +/** + * A Writer knows how to take a stream of tokens and render them to a + * string, given a context. It also maintains a cache of templates to + * avoid the need to parse the same template twice. + */ +function Writer () { + this.cache = {}; +} - // This function is used to render an arbitrary template - // in the current context by higher-order sections. - function subRender (template) { - return self.render(template, context, partials); - } +/** + * Clears all cached templates in this writer. + */ +Writer.prototype.clearCache = function clearCache () { + this.cache = {}; +}; + +/** + * Parses and caches the given `template` according to the given `tags` or + * `mustache.tags` if `tags` is omitted, and returns the array of tokens + * that is generated from the parse. + */ +Writer.prototype.parse = function parse (template, tags) { + var cache = this.cache; + var cacheKey = template + ':' + (tags || mustache.tags).join(':'); + var tokens = cache[cacheKey]; + + if (tokens == null) + tokens = cache[cacheKey] = parseTemplate(template, tags); + + return tokens; +}; + +/** + * High-level method that is used to render the given `template` with + * the given `view`. + * + * The optional `partials` argument may be an object that contains the + * names and templates of partials that are used in the template. It may + * also be a function that is used to load partial templates on the fly + * that takes a single argument: the name of the partial. + * + * If the optional `tags` argument is given here it must be an array with two + * string values: the opening and closing tags used in the template (e.g. + * [ "<%", "%>" ]). The default is to mustache.tags. + */ +Writer.prototype.render = function render (template, view, partials, tags) { + var tokens = this.parse(template, tags); + var context = (view instanceof Context) ? view : new Context(view); + return this.renderTokens(tokens, context, partials, template, tags); +}; + +/** + * Low-level method that renders the given array of `tokens` using + * the given `context` and `partials`. + * + * Note: The `originalTemplate` is only ever used to extract the portion + * of the original template that was contained in a higher-order section. + * If the template doesn't use higher-order sections, this argument may + * be omitted. + */ +Writer.prototype.renderTokens = function renderTokens (tokens, context, partials, originalTemplate, tags) { + var buffer = ''; + + var token, symbol, value; + for (var i = 0, numTokens = tokens.length; i < numTokens; ++i) { + value = undefined; + token = tokens[i]; + symbol = token[0]; + + if (symbol === '#') value = this.renderSection(token, context, partials, originalTemplate); + else if (symbol === '^') value = this.renderInverted(token, context, partials, originalTemplate); + else if (symbol === '>') value = this.renderPartial(token, context, partials, tags); + else if (symbol === '&') value = this.unescapedValue(token, context); + else if (symbol === 'name') value = this.escapedValue(token, context); + else if (symbol === 'text') value = this.rawValue(token); + + if (value !== undefined) + buffer += value; + } - if (!value) return; + return buffer; +}; - if (isArray(value)) { - for (var j = 0, valueLength = value.length; j < valueLength; ++j) { - buffer += this.renderTokens(token[4], context.push(value[j]), partials, originalTemplate); - } - } else if (typeof value === 'object' || typeof value === 'string' || typeof value === 'number') { - buffer += this.renderTokens(token[4], context.push(value), partials, originalTemplate); - } else if (isFunction(value)) { - if (typeof originalTemplate !== 'string') - throw new Error('Cannot use higher-order sections without the original template'); +Writer.prototype.renderSection = function renderSection (token, context, partials, originalTemplate) { + var self = this; + var buffer = ''; + var value = context.lookup(token[1]); - // Extract the portion of the original template that the section contains. - value = value.call(context.view, originalTemplate.slice(token[3], token[5]), subRender); + // This function is used to render an arbitrary template + // in the current context by higher-order sections. + function subRender (template) { + return self.render(template, context, partials); + } - if (value != null) - buffer += value; - } else { - buffer += this.renderTokens(token[4], context, partials, originalTemplate); - } - return buffer; - }; - - Writer.prototype.renderInverted = function renderInverted (token, context, partials, originalTemplate) { - var value = context.lookup(token[1]); - - // Use JavaScript's definition of falsy. Include empty arrays. - // See https://github.com/janl/mustache.js/issues/186 - if (!value || (isArray(value) && value.length === 0)) - return this.renderTokens(token[4], context, partials, originalTemplate); - }; - - Writer.prototype.indentPartial = function indentPartial (partial, indentation, lineHasNonSpace) { - var filteredIndentation = indentation.replace(/[^ \t]/g, ''); - var partialByNl = partial.split('\n'); - for (var i = 0; i < partialByNl.length; i++) { - if (partialByNl[i].length && (i > 0 || !lineHasNonSpace)) { - partialByNl[i] = filteredIndentation + partialByNl[i]; - } - } - return partialByNl.join('\n'); - }; - - Writer.prototype.renderPartial = function renderPartial (token, context, partials, tags) { - if (!partials) return; - - var value = isFunction(partials) ? partials(token[1]) : partials[token[1]]; - if (value != null) { - var lineHasNonSpace = token[6]; - var tagIndex = token[5]; - var indentation = token[4]; - var indentedValue = value; - if (tagIndex == 0 && indentation) { - indentedValue = this.indentPartial(value, indentation, lineHasNonSpace); - } - return this.renderTokens(this.parse(indentedValue, tags), context, partials, indentedValue); + if (!value) return; + + if (isArray(value)) { + for (var j = 0, valueLength = value.length; j < valueLength; ++j) { + buffer += this.renderTokens(token[4], context.push(value[j]), partials, originalTemplate); } - }; + } else if (typeof value === 'object' || typeof value === 'string' || typeof value === 'number') { + buffer += this.renderTokens(token[4], context.push(value), partials, originalTemplate); + } else if (isFunction(value)) { + if (typeof originalTemplate !== 'string') + throw new Error('Cannot use higher-order sections without the original template'); - Writer.prototype.unescapedValue = function unescapedValue (token, context) { - var value = context.lookup(token[1]); - if (value != null) - return value; - }; + // Extract the portion of the original template that the section contains. + value = value.call(context.view, originalTemplate.slice(token[3], token[5]), subRender); - Writer.prototype.escapedValue = function escapedValue (token, context) { - var value = context.lookup(token[1]); if (value != null) - return mustache.escape(value); - }; - - Writer.prototype.rawValue = function rawValue (token) { - return token[1]; - }; - - mustache.name = 'mustache.js'; - mustache.version = '3.1.0'; - mustache.tags = [ '{{', '}}' ]; - - // All high-level mustache.* functions use this writer. - var defaultWriter = new Writer(); - - /** - * Clears all cached templates in the default writer. - */ - mustache.clearCache = function clearCache () { - return defaultWriter.clearCache(); - }; - - /** - * Parses and caches the given template in the default writer and returns the - * array of tokens it contains. Doing this ahead of time avoids the need to - * parse templates on the fly as they are rendered. - */ - mustache.parse = function parse (template, tags) { - return defaultWriter.parse(template, tags); - }; - - /** - * Renders the `template` with the given `view` and `partials` using the - * default writer. If the optional `tags` argument is given here it must be an - * array with two string values: the opening and closing tags used in the - * template (e.g. [ "<%", "%>" ]). The default is to mustache.tags. - */ - mustache.render = function render (template, view, partials, tags) { - if (typeof template !== 'string') { - throw new TypeError('Invalid template! Template should be a "string" ' + - 'but "' + typeStr(template) + '" was given as the first ' + - 'argument for mustache#render(template, view, partials)'); + buffer += value; + } else { + buffer += this.renderTokens(token[4], context, partials, originalTemplate); + } + return buffer; +}; + +Writer.prototype.renderInverted = function renderInverted (token, context, partials, originalTemplate) { + var value = context.lookup(token[1]); + + // Use JavaScript's definition of falsy. Include empty arrays. + // See https://github.com/janl/mustache.js/issues/186 + if (!value || (isArray(value) && value.length === 0)) + return this.renderTokens(token[4], context, partials, originalTemplate); +}; + +Writer.prototype.indentPartial = function indentPartial (partial, indentation, lineHasNonSpace) { + var filteredIndentation = indentation.replace(/[^ \t]/g, ''); + var partialByNl = partial.split('\n'); + for (var i = 0; i < partialByNl.length; i++) { + if (partialByNl[i].length && (i > 0 || !lineHasNonSpace)) { + partialByNl[i] = filteredIndentation + partialByNl[i]; + } + } + return partialByNl.join('\n'); +}; + +Writer.prototype.renderPartial = function renderPartial (token, context, partials, tags) { + if (!partials) return; + + var value = isFunction(partials) ? partials(token[1]) : partials[token[1]]; + if (value != null) { + var lineHasNonSpace = token[6]; + var tagIndex = token[5]; + var indentation = token[4]; + var indentedValue = value; + if (tagIndex == 0 && indentation) { + indentedValue = this.indentPartial(value, indentation, lineHasNonSpace); } + return this.renderTokens(this.parse(indentedValue, tags), context, partials, indentedValue); + } +}; - return defaultWriter.render(template, view, partials, tags); - }; +Writer.prototype.unescapedValue = function unescapedValue (token, context) { + var value = context.lookup(token[1]); + if (value != null) + return value; +}; - // This is here for backwards compatibility with 0.4.x., - /*eslint-disable */ // eslint wants camel cased function name - mustache.to_html = function to_html (template, view, partials, send) { - /*eslint-enable*/ +Writer.prototype.escapedValue = function escapedValue (token, context) { + var value = context.lookup(token[1]); + if (value != null) + return mustache.escape(value); +}; - var result = mustache.render(template, view, partials); +Writer.prototype.rawValue = function rawValue (token) { + return token[1]; +}; - if (isFunction(send)) { - send(result); - } else { - return result; - } - }; +var mustache = { + name: 'mustache.js', + version: '3.1.0', + tags: [ '{{', '}}' ] +}; + +// All high-level mustache.* functions use this writer. +var defaultWriter = new Writer(); + +/** + * Clears all cached templates in the default writer. + */ +mustache.clearCache = function clearCache () { + return defaultWriter.clearCache(); +}; + +/** + * Parses and caches the given template in the default writer and returns the + * array of tokens it contains. Doing this ahead of time avoids the need to + * parse templates on the fly as they are rendered. + */ +mustache.parse = function parse (template, tags) { + return defaultWriter.parse(template, tags); +}; + +/** + * Renders the `template` with the given `view` and `partials` using the + * default writer. If the optional `tags` argument is given here it must be an + * array with two string values: the opening and closing tags used in the + * template (e.g. [ "<%", "%>" ]). The default is to mustache.tags. + */ +mustache.render = function render (template, view, partials, tags) { + if (typeof template !== 'string') { + throw new TypeError('Invalid template! Template should be a "string" ' + + 'but "' + typeStr(template) + '" was given as the first ' + + 'argument for mustache#render(template, view, partials)'); + } + + return defaultWriter.render(template, view, partials, tags); +}; + +// This is here for backwards compatibility with 0.4.x., +/*eslint-disable */ // eslint wants camel cased function name +mustache.to_html = function to_html (template, view, partials, send) { + /*eslint-enable*/ + + var result = mustache.render(template, view, partials); + + if (isFunction(send)) { + send(result); + } else { + return result; + } +}; - // Export the escaping function so that the user may override it. - // See https://github.com/janl/mustache.js/issues/244 - mustache.escape = escapeHtml; +// Export the escaping function so that the user may override it. +// See https://github.com/janl/mustache.js/issues/244 +mustache.escape = escapeHtml; - // Export these mainly for testing, but also for advanced usage. - mustache.Scanner = Scanner; - mustache.Context = Context; - mustache.Writer = Writer; +// Export these mainly for testing, but also for advanced usage. +mustache.Scanner = Scanner; +mustache.Context = Context; +mustache.Writer = Writer; - return mustache; -})); +export default mustache; \ No newline at end of file