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cjs_amd.js
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cjs_amd.js
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"format cjs";
var esprima = require("esprima"),
optionsNormalize = require("./options_normalize"),
getAst = require("./get_ast"),
types = require("ast-types"),
n = types.namedTypes;
var dirnameExp = /__dirname/;
var globalExp = /global/;
module.exports = function(load, options) {
var ast = getAst(load);
var source = load.source;
var cjsOptions = {
hasDirname: dirnameExp.test(source),
hasGlobal: globalExp.test(source),
duplicateCjsDependencies: options.duplicateCjsDependencies
};
cjsOptions.needsFunctionWrapper =
cjsOptions.hasDirname || cjsOptions.hasGlobal;
if (options && (options.normalizeMap || options.normalize)) {
normalizeModuleIdentifiers(ast, load, options);
}
var normalizedName;
if (options.namedDefines) {
normalizedName = optionsNormalize(
options,
load.name,
load.name,
load.address
);
}
ast = defineInsert(normalizedName, ast.body, cjsOptions);
return ast;
};
/**
* Given an ast, calls the visitor with the first argument of each `require` call
* @param {Object} ast - The ast to walk
* @param {Function} cb - The visitor function called on each match
*/
function visitRequireArgument(ast, cb) {
types.visit(ast, {
visitCallExpression: function(path) {
if (this.isRequireExpression(path.node)) {
var arg = path.getValueProperty("arguments")[0];
if (n.Literal.check(arg)) {
cb(arg);
}
}
this.traverse(path);
},
isRequireExpression(node) {
return n.Identifier.check(node.callee) && node.callee.name === "require";
}
});
}
/**
* Traverses the AST (CJS) and normalizes the module identifiers
*/
function normalizeModuleIdentifiers(ast, load, options) {
visitRequireArgument(ast, function(argument) {
var normalized = optionsNormalize(
options,
argument.value,
load.name,
load.address
);
argument.value = normalized;
argument.raw = `"${normalized}"`;
});
}
/**
* Given an AST, returns the module identifiers passed to `require` calls
* @param {Object} ast - The ast to walk
* @return {Array.<String>} The module identifiers
*/
function collectDependenciesIds(ast) {
var ids = [];
visitRequireArgument(ast, function(argument) {
ids.push(argument.value);
});
return ids;
}
function defineInsert(name, body, options) {
// Add in the function wrapper.
var wrapper = defineWrapper(options);
var code = makeDefineFunctionCode(
name,
options.duplicateCjsDependencies ? collectDependenciesIds(body) : [],
wrapper
);
var ast = esprima.parse(code);
var astBody = body || [];
var innerFunctions = 0;
var expectedFunctions = options.needsFunctionWrapper ? 2 : 1;
types.visit(ast, {
visitFunctionExpression: function(path) {
if (this.isModuleFactory()) {
var functionBody = path.getValueProperty("body").body;
astBody.forEach(function(part) {
functionBody.push(part);
});
// stop traversing the tree
this.abort();
}
// keep traversing the tree
this.traverse(path);
},
isModuleFactory: function() {
innerFunctions += 1;
return innerFunctions === expectedFunctions;
}
});
return ast;
}
function makeDefineFunctionCode(name, cjsDeps, body) {
var deps = "";
if (cjsDeps.length) {
deps = ["require", "exports", "module"]
.concat(cjsDeps)
.map(function(x) {
return `"${x}"`;
})
.join(", ")
}
var defineArgs = [
name ? `"${name}"` : null,
deps ? `[ ${deps} ]` : null,
`function(require, exports, module) { ${body} }`
];
return `define(${defineArgs.filter(isTruthy).join(", ")});`;
}
function isTruthy(x) {
return Boolean(x);
}
function defineWrapper(options) {
// Add in the function wrapper.
var wrapper = "";
if (options.needsFunctionWrapper) {
wrapper += "(function(";
if (options.hasGlobal) {
wrapper += "global, ";
}
if (options.hasDirname) {
wrapper += "__dirname, ";
}
wrapper += "require, exports, module";
wrapper += "){\n";
wrapper += "})(";
if (options.hasGlobal) {
wrapper += "function() { return this; }(), ";
}
if (options.hasDirname) {
wrapper += '"/", ';
}
wrapper += "require, exports, module";
wrapper += ");";
}
return wrapper;
}