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Express_Crud_Example/node_modules/ejs/lib/ejs.js
marcusferl 32ee4da580 init
2022-01-28 22:33:42 +01:00

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/*
* EJS Embedded JavaScript templates
* Copyright 2112 Matthew Eernisse (mde@fleegix.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
'use strict';
/**
* @file Embedded JavaScript templating engine. {@link http://ejs.co}
* @author Matthew Eernisse <mde@fleegix.org>
* @author Tiancheng "Timothy" Gu <timothygu99@gmail.com>
* @project EJS
* @license {@link http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0}
*/
/**
* EJS internal functions.
*
* Technically this "module" lies in the same file as {@link module:ejs}, for
* the sake of organization all the private functions re grouped into this
* module.
*
* @module ejs-internal
* @private
*/
/**
* Embedded JavaScript templating engine.
*
* @module ejs
* @public
*/
var fs = require('fs');
var path = require('path');
var utils = require('./utils');
var scopeOptionWarned = false;
/** @type {string} */
var _VERSION_STRING = require('../package.json').version;
var _DEFAULT_OPEN_DELIMITER = '<';
var _DEFAULT_CLOSE_DELIMITER = '>';
var _DEFAULT_DELIMITER = '%';
var _DEFAULT_LOCALS_NAME = 'locals';
var _NAME = 'ejs';
var _REGEX_STRING = '(<%%|%%>|<%=|<%-|<%_|<%#|<%|%>|-%>|_%>)';
var _OPTS_PASSABLE_WITH_DATA = ['delimiter', 'scope', 'context', 'debug', 'compileDebug',
'client', '_with', 'rmWhitespace', 'strict', 'filename', 'async'];
// We don't allow 'cache' option to be passed in the data obj for
// the normal `render` call, but this is where Express 2 & 3 put it
// so we make an exception for `renderFile`
var _OPTS_PASSABLE_WITH_DATA_EXPRESS = _OPTS_PASSABLE_WITH_DATA.concat('cache');
var _BOM = /^\uFEFF/;
/**
* EJS template function cache. This can be a LRU object from lru-cache NPM
* module. By default, it is {@link module:utils.cache}, a simple in-process
* cache that grows continuously.
*
* @type {Cache}
*/
exports.cache = utils.cache;
/**
* Custom file loader. Useful for template preprocessing or restricting access
* to a certain part of the filesystem.
*
* @type {fileLoader}
*/
exports.fileLoader = fs.readFileSync;
/**
* Name of the object containing the locals.
*
* This variable is overridden by {@link Options}`.localsName` if it is not
* `undefined`.
*
* @type {String}
* @public
*/
exports.localsName = _DEFAULT_LOCALS_NAME;
/**
* Promise implementation -- defaults to the native implementation if available
* This is mostly just for testability
*
* @type {PromiseConstructorLike}
* @public
*/
exports.promiseImpl = (new Function('return this;'))().Promise;
/**
* Get the path to the included file from the parent file path and the
* specified path.
*
* @param {String} name specified path
* @param {String} filename parent file path
* @param {Boolean} [isDir=false] whether the parent file path is a directory
* @return {String}
*/
exports.resolveInclude = function(name, filename, isDir) {
var dirname = path.dirname;
var extname = path.extname;
var resolve = path.resolve;
var includePath = resolve(isDir ? filename : dirname(filename), name);
var ext = extname(name);
if (!ext) {
includePath += '.ejs';
}
return includePath;
};
/**
* Try to resolve file path on multiple directories
*
* @param {String} name specified path
* @param {Array<String>} paths list of possible parent directory paths
* @return {String}
*/
function resolvePaths(name, paths) {
var filePath;
if (paths.some(function (v) {
filePath = exports.resolveInclude(name, v, true);
return fs.existsSync(filePath);
})) {
return filePath;
}
}
/**
* Get the path to the included file by Options
*
* @param {String} path specified path
* @param {Options} options compilation options
* @return {String}
*/
function getIncludePath(path, options) {
var includePath;
var filePath;
var views = options.views;
var match = /^[A-Za-z]+:\\|^\//.exec(path);
// Abs path
if (match && match.length) {
path = path.replace(/^\/*/, '');
if (Array.isArray(options.root)) {
includePath = resolvePaths(path, options.root);
} else {
includePath = exports.resolveInclude(path, options.root || '/', true);
}
}
// Relative paths
else {
// Look relative to a passed filename first
if (options.filename) {
filePath = exports.resolveInclude(path, options.filename);
if (fs.existsSync(filePath)) {
includePath = filePath;
}
}
// Then look in any views directories
if (!includePath && Array.isArray(views)) {
includePath = resolvePaths(path, views);
}
if (!includePath && typeof options.includer !== 'function') {
throw new Error('Could not find the include file "' +
options.escapeFunction(path) + '"');
}
}
return includePath;
}
/**
* Get the template from a string or a file, either compiled on-the-fly or
* read from cache (if enabled), and cache the template if needed.
*
* If `template` is not set, the file specified in `options.filename` will be
* read.
*
* If `options.cache` is true, this function reads the file from
* `options.filename` so it must be set prior to calling this function.
*
* @memberof module:ejs-internal
* @param {Options} options compilation options
* @param {String} [template] template source
* @return {(TemplateFunction|ClientFunction)}
* Depending on the value of `options.client`, either type might be returned.
* @static
*/
function handleCache(options, template) {
var func;
var filename = options.filename;
var hasTemplate = arguments.length > 1;
if (options.cache) {
if (!filename) {
throw new Error('cache option requires a filename');
}
func = exports.cache.get(filename);
if (func) {
return func;
}
if (!hasTemplate) {
template = fileLoader(filename).toString().replace(_BOM, '');
}
}
else if (!hasTemplate) {
// istanbul ignore if: should not happen at all
if (!filename) {
throw new Error('Internal EJS error: no file name or template '
+ 'provided');
}
template = fileLoader(filename).toString().replace(_BOM, '');
}
func = exports.compile(template, options);
if (options.cache) {
exports.cache.set(filename, func);
}
return func;
}
/**
* Try calling handleCache with the given options and data and call the
* callback with the result. If an error occurs, call the callback with
* the error. Used by renderFile().
*
* @memberof module:ejs-internal
* @param {Options} options compilation options
* @param {Object} data template data
* @param {RenderFileCallback} cb callback
* @static
*/
function tryHandleCache(options, data, cb) {
var result;
if (!cb) {
if (typeof exports.promiseImpl == 'function') {
return new exports.promiseImpl(function (resolve, reject) {
try {
result = handleCache(options)(data);
resolve(result);
}
catch (err) {
reject(err);
}
});
}
else {
throw new Error('Please provide a callback function');
}
}
else {
try {
result = handleCache(options)(data);
}
catch (err) {
return cb(err);
}
cb(null, result);
}
}
/**
* fileLoader is independent
*
* @param {String} filePath ejs file path.
* @return {String} The contents of the specified file.
* @static
*/
function fileLoader(filePath){
return exports.fileLoader(filePath);
}
/**
* Get the template function.
*
* If `options.cache` is `true`, then the template is cached.
*
* @memberof module:ejs-internal
* @param {String} path path for the specified file
* @param {Options} options compilation options
* @return {(TemplateFunction|ClientFunction)}
* Depending on the value of `options.client`, either type might be returned
* @static
*/
function includeFile(path, options) {
var opts = utils.shallowCopy({}, options);
opts.filename = getIncludePath(path, opts);
if (typeof options.includer === 'function') {
var includerResult = options.includer(path, opts.filename);
if (includerResult) {
if (includerResult.filename) {
opts.filename = includerResult.filename;
}
if (includerResult.template) {
return handleCache(opts, includerResult.template);
}
}
}
return handleCache(opts);
}
/**
* Re-throw the given `err` in context to the `str` of ejs, `filename`, and
* `lineno`.
*
* @implements {RethrowCallback}
* @memberof module:ejs-internal
* @param {Error} err Error object
* @param {String} str EJS source
* @param {String} flnm file name of the EJS file
* @param {Number} lineno line number of the error
* @param {EscapeCallback} esc
* @static
*/
function rethrow(err, str, flnm, lineno, esc) {
var lines = str.split('\n');
var start = Math.max(lineno - 3, 0);
var end = Math.min(lines.length, lineno + 3);
var filename = esc(flnm);
// Error context
var context = lines.slice(start, end).map(function (line, i){
var curr = i + start + 1;
return (curr == lineno ? ' >> ' : ' ')
+ curr
+ '| '
+ line;
}).join('\n');
// Alter exception message
err.path = filename;
err.message = (filename || 'ejs') + ':'
+ lineno + '\n'
+ context + '\n\n'
+ err.message;
throw err;
}
function stripSemi(str){
return str.replace(/;(\s*$)/, '$1');
}
/**
* Compile the given `str` of ejs into a template function.
*
* @param {String} template EJS template
*
* @param {Options} [opts] compilation options
*
* @return {(TemplateFunction|ClientFunction)}
* Depending on the value of `opts.client`, either type might be returned.
* Note that the return type of the function also depends on the value of `opts.async`.
* @public
*/
exports.compile = function compile(template, opts) {
var templ;
// v1 compat
// 'scope' is 'context'
// FIXME: Remove this in a future version
if (opts && opts.scope) {
if (!scopeOptionWarned){
console.warn('`scope` option is deprecated and will be removed in EJS 3');
scopeOptionWarned = true;
}
if (!opts.context) {
opts.context = opts.scope;
}
delete opts.scope;
}
templ = new Template(template, opts);
return templ.compile();
};
/**
* Render the given `template` of ejs.
*
* If you would like to include options but not data, you need to explicitly
* call this function with `data` being an empty object or `null`.
*
* @param {String} template EJS template
* @param {Object} [data={}] template data
* @param {Options} [opts={}] compilation and rendering options
* @return {(String|Promise<String>)}
* Return value type depends on `opts.async`.
* @public
*/
exports.render = function (template, d, o) {
var data = d || {};
var opts = o || {};
// No options object -- if there are optiony names
// in the data, copy them to options
if (arguments.length == 2) {
utils.shallowCopyFromList(opts, data, _OPTS_PASSABLE_WITH_DATA);
}
return handleCache(opts, template)(data);
};
/**
* Render an EJS file at the given `path` and callback `cb(err, str)`.
*
* If you would like to include options but not data, you need to explicitly
* call this function with `data` being an empty object or `null`.
*
* @param {String} path path to the EJS file
* @param {Object} [data={}] template data
* @param {Options} [opts={}] compilation and rendering options
* @param {RenderFileCallback} cb callback
* @public
*/
exports.renderFile = function () {
var args = Array.prototype.slice.call(arguments);
var filename = args.shift();
var cb;
var opts = {filename: filename};
var data;
var viewOpts;
// Do we have a callback?
if (typeof arguments[arguments.length - 1] == 'function') {
cb = args.pop();
}
// Do we have data/opts?
if (args.length) {
// Should always have data obj
data = args.shift();
// Normal passed opts (data obj + opts obj)
if (args.length) {
// Use shallowCopy so we don't pollute passed in opts obj with new vals
utils.shallowCopy(opts, args.pop());
}
// Special casing for Express (settings + opts-in-data)
else {
// Express 3 and 4
if (data.settings) {
// Pull a few things from known locations
if (data.settings.views) {
opts.views = data.settings.views;
}
if (data.settings['view cache']) {
opts.cache = true;
}
// Undocumented after Express 2, but still usable, esp. for
// items that are unsafe to be passed along with data, like `root`
viewOpts = data.settings['view options'];
if (viewOpts) {
utils.shallowCopy(opts, viewOpts);
}
}
// Express 2 and lower, values set in app.locals, or people who just
// want to pass options in their data. NOTE: These values will override
// anything previously set in settings or settings['view options']
utils.shallowCopyFromList(opts, data, _OPTS_PASSABLE_WITH_DATA_EXPRESS);
}
opts.filename = filename;
}
else {
data = {};
}
return tryHandleCache(opts, data, cb);
};
/**
* Clear intermediate JavaScript cache. Calls {@link Cache#reset}.
* @public
*/
/**
* EJS template class
* @public
*/
exports.Template = Template;
exports.clearCache = function () {
exports.cache.reset();
};
function Template(text, opts) {
opts = opts || {};
var options = {};
this.templateText = text;
/** @type {string | null} */
this.mode = null;
this.truncate = false;
this.currentLine = 1;
this.source = '';
options.client = opts.client || false;
options.escapeFunction = opts.escape || opts.escapeFunction || utils.escapeXML;
options.compileDebug = opts.compileDebug !== false;
options.debug = !!opts.debug;
options.filename = opts.filename;
options.openDelimiter = opts.openDelimiter || exports.openDelimiter || _DEFAULT_OPEN_DELIMITER;
options.closeDelimiter = opts.closeDelimiter || exports.closeDelimiter || _DEFAULT_CLOSE_DELIMITER;
options.delimiter = opts.delimiter || exports.delimiter || _DEFAULT_DELIMITER;
options.strict = opts.strict || false;
options.context = opts.context;
options.cache = opts.cache || false;
options.rmWhitespace = opts.rmWhitespace;
options.root = opts.root;
options.includer = opts.includer;
options.outputFunctionName = opts.outputFunctionName;
options.localsName = opts.localsName || exports.localsName || _DEFAULT_LOCALS_NAME;
options.views = opts.views;
options.async = opts.async;
options.destructuredLocals = opts.destructuredLocals;
options.legacyInclude = typeof opts.legacyInclude != 'undefined' ? !!opts.legacyInclude : true;
if (options.strict) {
options._with = false;
}
else {
options._with = typeof opts._with != 'undefined' ? opts._with : true;
}
this.opts = options;
this.regex = this.createRegex();
}
Template.modes = {
EVAL: 'eval',
ESCAPED: 'escaped',
RAW: 'raw',
COMMENT: 'comment',
LITERAL: 'literal'
};
Template.prototype = {
createRegex: function () {
var str = _REGEX_STRING;
var delim = utils.escapeRegExpChars(this.opts.delimiter);
var open = utils.escapeRegExpChars(this.opts.openDelimiter);
var close = utils.escapeRegExpChars(this.opts.closeDelimiter);
str = str.replace(/%/g, delim)
.replace(/</g, open)
.replace(/>/g, close);
return new RegExp(str);
},
compile: function () {
/** @type {string} */
var src;
/** @type {ClientFunction} */
var fn;
var opts = this.opts;
var prepended = '';
var appended = '';
/** @type {EscapeCallback} */
var escapeFn = opts.escapeFunction;
/** @type {FunctionConstructor} */
var ctor;
/** @type {string} */
var sanitizedFilename = opts.filename ? JSON.stringify(opts.filename) : 'undefined';
if (!this.source) {
this.generateSource();
prepended +=
' var __output = "";\n' +
' function __append(s) { if (s !== undefined && s !== null) __output += s }\n';
if (opts.outputFunctionName) {
prepended += ' var ' + opts.outputFunctionName + ' = __append;' + '\n';
}
if (opts.destructuredLocals && opts.destructuredLocals.length) {
var destructuring = ' var __locals = (' + opts.localsName + ' || {}),\n';
for (var i = 0; i < opts.destructuredLocals.length; i++) {
var name = opts.destructuredLocals[i];
if (i > 0) {
destructuring += ',\n ';
}
destructuring += name + ' = __locals.' + name;
}
prepended += destructuring + ';\n';
}
if (opts._with !== false) {
prepended += ' with (' + opts.localsName + ' || {}) {' + '\n';
appended += ' }' + '\n';
}
appended += ' return __output;' + '\n';
this.source = prepended + this.source + appended;
}
if (opts.compileDebug) {
src = 'var __line = 1' + '\n'
+ ' , __lines = ' + JSON.stringify(this.templateText) + '\n'
+ ' , __filename = ' + sanitizedFilename + ';' + '\n'
+ 'try {' + '\n'
+ this.source
+ '} catch (e) {' + '\n'
+ ' rethrow(e, __lines, __filename, __line, escapeFn);' + '\n'
+ '}' + '\n';
}
else {
src = this.source;
}
if (opts.client) {
src = 'escapeFn = escapeFn || ' + escapeFn.toString() + ';' + '\n' + src;
if (opts.compileDebug) {
src = 'rethrow = rethrow || ' + rethrow.toString() + ';' + '\n' + src;
}
}
if (opts.strict) {
src = '"use strict";\n' + src;
}
if (opts.debug) {
console.log(src);
}
if (opts.compileDebug && opts.filename) {
src = src + '\n'
+ '//# sourceURL=' + sanitizedFilename + '\n';
}
try {
if (opts.async) {
// Have to use generated function for this, since in envs without support,
// it breaks in parsing
try {
ctor = (new Function('return (async function(){}).constructor;'))();
}
catch(e) {
if (e instanceof SyntaxError) {
throw new Error('This environment does not support async/await');
}
else {
throw e;
}
}
}
else {
ctor = Function;
}
fn = new ctor(opts.localsName + ', escapeFn, include, rethrow', src);
}
catch(e) {
// istanbul ignore else
if (e instanceof SyntaxError) {
if (opts.filename) {
e.message += ' in ' + opts.filename;
}
e.message += ' while compiling ejs\n\n';
e.message += 'If the above error is not helpful, you may want to try EJS-Lint:\n';
e.message += 'https://github.com/RyanZim/EJS-Lint';
if (!opts.async) {
e.message += '\n';
e.message += 'Or, if you meant to create an async function, pass `async: true` as an option.';
}
}
throw e;
}
// Return a callable function which will execute the function
// created by the source-code, with the passed data as locals
// Adds a local `include` function which allows full recursive include
var returnedFn = opts.client ? fn : function anonymous(data) {
var include = function (path, includeData) {
var d = utils.shallowCopy({}, data);
if (includeData) {
d = utils.shallowCopy(d, includeData);
}
return includeFile(path, opts)(d);
};
return fn.apply(opts.context, [data || {}, escapeFn, include, rethrow]);
};
if (opts.filename && typeof Object.defineProperty === 'function') {
var filename = opts.filename;
var basename = path.basename(filename, path.extname(filename));
try {
Object.defineProperty(returnedFn, 'name', {
value: basename,
writable: false,
enumerable: false,
configurable: true
});
} catch (e) {/* ignore */}
}
return returnedFn;
},
generateSource: function () {
var opts = this.opts;
if (opts.rmWhitespace) {
// Have to use two separate replace here as `^` and `$` operators don't
// work well with `\r` and empty lines don't work well with the `m` flag.
this.templateText =
this.templateText.replace(/[\r\n]+/g, '\n').replace(/^\s+|\s+$/gm, '');
}
// Slurp spaces and tabs before <%_ and after _%>
this.templateText =
this.templateText.replace(/[ \t]*<%_/gm, '<%_').replace(/_%>[ \t]*/gm, '_%>');
var self = this;
var matches = this.parseTemplateText();
var d = this.opts.delimiter;
var o = this.opts.openDelimiter;
var c = this.opts.closeDelimiter;
if (matches && matches.length) {
matches.forEach(function (line, index) {
var closing;
// If this is an opening tag, check for closing tags
// FIXME: May end up with some false positives here
// Better to store modes as k/v with openDelimiter + delimiter as key
// Then this can simply check against the map
if ( line.indexOf(o + d) === 0 // If it is a tag
&& line.indexOf(o + d + d) !== 0) { // and is not escaped
closing = matches[index + 2];
if (!(closing == d + c || closing == '-' + d + c || closing == '_' + d + c)) {
throw new Error('Could not find matching close tag for "' + line + '".');
}
}
self.scanLine(line);
});
}
},
parseTemplateText: function () {
var str = this.templateText;
var pat = this.regex;
var result = pat.exec(str);
var arr = [];
var firstPos;
while (result) {
firstPos = result.index;
if (firstPos !== 0) {
arr.push(str.substring(0, firstPos));
str = str.slice(firstPos);
}
arr.push(result[0]);
str = str.slice(result[0].length);
result = pat.exec(str);
}
if (str) {
arr.push(str);
}
return arr;
},
_addOutput: function (line) {
if (this.truncate) {
// Only replace single leading linebreak in the line after
// -%> tag -- this is the single, trailing linebreak
// after the tag that the truncation mode replaces
// Handle Win / Unix / old Mac linebreaks -- do the \r\n
// combo first in the regex-or
line = line.replace(/^(?:\r\n|\r|\n)/, '');
this.truncate = false;
}
if (!line) {
return line;
}
// Preserve literal slashes
line = line.replace(/\\/g, '\\\\');
// Convert linebreaks
line = line.replace(/\n/g, '\\n');
line = line.replace(/\r/g, '\\r');
// Escape double-quotes
// - this will be the delimiter during execution
line = line.replace(/"/g, '\\"');
this.source += ' ; __append("' + line + '")' + '\n';
},
scanLine: function (line) {
var self = this;
var d = this.opts.delimiter;
var o = this.opts.openDelimiter;
var c = this.opts.closeDelimiter;
var newLineCount = 0;
newLineCount = (line.split('\n').length - 1);
switch (line) {
case o + d:
case o + d + '_':
this.mode = Template.modes.EVAL;
break;
case o + d + '=':
this.mode = Template.modes.ESCAPED;
break;
case o + d + '-':
this.mode = Template.modes.RAW;
break;
case o + d + '#':
this.mode = Template.modes.COMMENT;
break;
case o + d + d:
this.mode = Template.modes.LITERAL;
this.source += ' ; __append("' + line.replace(o + d + d, o + d) + '")' + '\n';
break;
case d + d + c:
this.mode = Template.modes.LITERAL;
this.source += ' ; __append("' + line.replace(d + d + c, d + c) + '")' + '\n';
break;
case d + c:
case '-' + d + c:
case '_' + d + c:
if (this.mode == Template.modes.LITERAL) {
this._addOutput(line);
}
this.mode = null;
this.truncate = line.indexOf('-') === 0 || line.indexOf('_') === 0;
break;
default:
// In script mode, depends on type of tag
if (this.mode) {
// If '//' is found without a line break, add a line break.
switch (this.mode) {
case Template.modes.EVAL:
case Template.modes.ESCAPED:
case Template.modes.RAW:
if (line.lastIndexOf('//') > line.lastIndexOf('\n')) {
line += '\n';
}
}
switch (this.mode) {
// Just executing code
case Template.modes.EVAL:
this.source += ' ; ' + line + '\n';
break;
// Exec, esc, and output
case Template.modes.ESCAPED:
this.source += ' ; __append(escapeFn(' + stripSemi(line) + '))' + '\n';
break;
// Exec and output
case Template.modes.RAW:
this.source += ' ; __append(' + stripSemi(line) + ')' + '\n';
break;
case Template.modes.COMMENT:
// Do nothing
break;
// Literal <%% mode, append as raw output
case Template.modes.LITERAL:
this._addOutput(line);
break;
}
}
// In string mode, just add the output
else {
this._addOutput(line);
}
}
if (self.opts.compileDebug && newLineCount) {
this.currentLine += newLineCount;
this.source += ' ; __line = ' + this.currentLine + '\n';
}
}
};
/**
* Escape characters reserved in XML.
*
* This is simply an export of {@link module:utils.escapeXML}.
*
* If `markup` is `undefined` or `null`, the empty string is returned.
*
* @param {String} markup Input string
* @return {String} Escaped string
* @public
* @func
* */
exports.escapeXML = utils.escapeXML;
/**
* Express.js support.
*
* This is an alias for {@link module:ejs.renderFile}, in order to support
* Express.js out-of-the-box.
*
* @func
*/
exports.__express = exports.renderFile;
/**
* Version of EJS.
*
* @readonly
* @type {String}
* @public
*/
exports.VERSION = _VERSION_STRING;
/**
* Name for detection of EJS.
*
* @readonly
* @type {String}
* @public
*/
exports.name = _NAME;
/* istanbul ignore if */
if (typeof window != 'undefined') {
window.ejs = exports;
}
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