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amdefine.js
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301 lines (263 loc) · 9.68 KB
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/** vim: et:ts=4:sw=4:sts=4
* @license amdefine 1.0.1 Copyright (c) 2011-2016, The Dojo Foundation All Rights Reserved.
* Available via the MIT or new BSD license.
* see: http://github.com/jrburke/amdefine for details
*/
/*jslint node: true */
/*global module, process */
'use strict';
/**
* Creates a define for node.
* @param {Object} module the "module" object that is defined by Node for the
* current module.
* @param {Function} [requireFn]. Node's require function for the current module.
* It only needs to be passed in Node versions before 0.5, when module.require
* did not exist.
* @returns {Function} a define function that is usable for the current node
* module.
*/
function amdefine(module, requireFn) {
'use strict';
var defineCache = {},
loaderCache = {},
alreadyCalled = false,
path = require('path'),
makeRequire, stringRequire;
/**
* Trims the . and .. from an array of path segments.
* It will keep a leading path segment if a .. will become
* the first path segment, to help with module name lookups,
* which act like paths, but can be remapped. But the end result,
* all paths that use this function should look normalized.
* NOTE: this method MODIFIES the input array.
* @param {Array} ary the array of path segments.
*/
function trimDots(ary) {
var i, part;
for (i = 0; ary[i]; i+= 1) {
part = ary[i];
if (part === '.') {
ary.splice(i, 1);
i -= 1;
} else if (part === '..') {
if (i === 1 && (ary[2] === '..' || ary[0] === '..')) {
//End of the line. Keep at least one non-dot
//path segment at the front so it can be mapped
//correctly to disk. Otherwise, there is likely
//no path mapping for a path starting with '..'.
//This can still fail, but catches the most reasonable
//uses of ..
break;
} else if (i > 0) {
ary.splice(i - 1, 2);
i -= 2;
}
}
}
}
function normalize(name, baseName) {
var baseParts;
//Adjust any relative paths.
if (name && name.charAt(0) === '.') {
//If have a base name, try to normalize against it,
//otherwise, assume it is a top-level require that will
//be relative to baseUrl in the end.
if (baseName) {
baseParts = baseName.split('/');
baseParts = baseParts.slice(0, baseParts.length - 1);
baseParts = baseParts.concat(name.split('/'));
trimDots(baseParts);
name = baseParts.join('/');
}
}
return name;
}
/**
* Create the normalize() function passed to a loader plugin's
* normalize method.
*/
function makeNormalize(relName) {
return function (name) {
return normalize(name, relName);
};
}
function makeLoad(id) {
function load(value) {
loaderCache[id] = value;
}
load.fromText = function (id, text) {
//This one is difficult because the text can/probably uses
//define, and any relative paths and requires should be relative
//to that id was it would be found on disk. But this would require
//bootstrapping a module/require fairly deeply from node core.
//Not sure how best to go about that yet.
throw new Error('amdefine does not implement load.fromText');
};
return load;
}
makeRequire = function (systemRequire, exports, module, relId) {
function amdRequire(deps, callback) {
if (typeof deps === 'string') {
//Synchronous, single module require('')
return stringRequire(systemRequire, exports, module, deps, relId);
} else {
//Array of dependencies with a callback.
//Convert the dependencies to modules.
deps = deps.map(function (depName) {
return stringRequire(systemRequire, exports, module, depName, relId);
});
//Wait for next tick to call back the require call.
if (callback) {
process.nextTick(function () {
callback.apply(null, deps);
});
}
}
}
amdRequire.toUrl = function (filePath) {
if (filePath.indexOf('.') === 0) {
return normalize(filePath, path.dirname(module.filename));
} else {
return filePath;
}
};
return amdRequire;
};
//Favor explicit value, passed in if the module wants to support Node 0.4.
requireFn = requireFn || function req() {
return module.require.apply(module, arguments);
};
function runFactory(id, deps, factory) {
var r, e, m, result;
if (id) {
e = loaderCache[id] = {};
m = {
id: id,
uri: __filename,
exports: e
};
r = makeRequire(requireFn, e, m, id);
} else {
//Only support one define call per file
if (alreadyCalled) {
throw new Error('amdefine with no module ID cannot be called more than once per file.');
}
alreadyCalled = true;
//Use the real variables from node
//Use module.exports for exports, since
//the exports in here is amdefine exports.
e = module.exports;
m = module;
r = makeRequire(requireFn, e, m, module.id);
}
//If there are dependencies, they are strings, so need
//to convert them to dependency values.
if (deps) {
deps = deps.map(function (depName) {
return r(depName);
});
}
//Call the factory with the right dependencies.
if (typeof factory === 'function') {
result = factory.apply(m.exports, deps);
} else {
result = factory;
}
if (result !== undefined) {
m.exports = result;
if (id) {
loaderCache[id] = m.exports;
}
}
}
stringRequire = function (systemRequire, exports, module, id, relId) {
//Split the ID by a ! so that
var index = id.indexOf('!'),
originalId = id,
prefix, plugin;
if (index === -1) {
id = normalize(id, relId);
//Straight module lookup. If it is one of the special dependencies,
//deal with it, otherwise, delegate to node.
if (id === 'require') {
return makeRequire(systemRequire, exports, module, relId);
} else if (id === 'exports') {
return exports;
} else if (id === 'module') {
return module;
} else if (loaderCache.hasOwnProperty(id)) {
return loaderCache[id];
} else if (defineCache[id]) {
runFactory.apply(null, defineCache[id]);
return loaderCache[id];
} else {
if(systemRequire) {
return systemRequire(originalId);
} else {
throw new Error('No module with ID: ' + id);
}
}
} else {
//There is a plugin in play.
prefix = id.substring(0, index);
id = id.substring(index + 1, id.length);
plugin = stringRequire(systemRequire, exports, module, prefix, relId);
if (plugin.normalize) {
id = plugin.normalize(id, makeNormalize(relId));
} else {
//Normalize the ID normally.
id = normalize(id, relId);
}
if (loaderCache[id]) {
return loaderCache[id];
} else {
plugin.load(id, makeRequire(systemRequire, exports, module, relId), makeLoad(id), {});
return loaderCache[id];
}
}
};
//Create a define function specific to the module asking for amdefine.
function define(id, deps, factory) {
if (Array.isArray(id)) {
factory = deps;
deps = id;
id = undefined;
} else if (typeof id !== 'string') {
factory = id;
id = deps = undefined;
}
if (deps && !Array.isArray(deps)) {
factory = deps;
deps = undefined;
}
if (!deps) {
deps = ['require', 'exports', 'module'];
}
//Set up properties for this module. If an ID, then use
//internal cache. If no ID, then use the external variables
//for this node module.
if (id) {
//Put the module in deep freeze until there is a
//require call for it.
defineCache[id] = [id, deps, factory];
} else {
runFactory(id, deps, factory);
}
}
//define.require, which has access to all the values in the
//cache. Useful for AMD modules that all have IDs in the file,
//but need to finally export a value to node based on one of those
//IDs.
define.require = function (id) {
if (loaderCache[id]) {
return loaderCache[id];
}
if (defineCache[id]) {
runFactory.apply(null, defineCache[id]);
return loaderCache[id];
}
};
define.amd = {};
return define;
}
module.exports = amdefine;