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| module.exports = SystemFormatter;
var util = require("../../util");
var t = require("../../types");
var _ = require("lodash");
var SETTER_MODULE_NAMESPACE = t.identifier("m");
var DEFAULT_IDENTIFIER = t.identifier("default");
var NULL_SETTER = t.literal(null);
function SystemFormatter(file) {
this.exportedStatements = [];
this.importedModule = {};
this.exportIdentifier = file.generateUidIdentifier("export");
this.file = file;
}
SystemFormatter.prototype.transform = function (ast) {
var program = ast.program;
var body = program.body;
// extract the module name
var moduleName = this.file.opts.filename
.replace(/^.*\//, "").replace(/\..*$/, "");
// build an array of module names
var dependencies = Object.keys(this.importedModule).map(t.literal);
// generate the __moduleName variable
var moduleNameVariableNode = t.variableDeclaration("var", [
t.variableDeclarator(
t.identifier("__moduleName"),
t.literal(moduleName)
)
]);
body.splice(1, 0, moduleNameVariableNode);
// generate an array of import variables
var declaredSetters = _(this.importedModule)
.map()
.flatten()
.pluck("variableName")
.pluck("name")
.uniq()
.map(t.identifier)
.map(function (name) {
return t.variableDeclarator(name);
})
.value();
if (declaredSetters.length) {
body.splice(2, 0, t.variableDeclaration("var", declaredSetters));
}
// generate the execute function expression
var executeFunctionExpression = t.functionExpression(
null, [], t.blockStatement(this.exportedStatements)
);
// generate the execute function expression
var settersArrayExpression = t.arrayExpression(this._buildSetters());
// generate the return statement
var moduleReturnStatement = t.returnStatement(t.objectExpression([
t.property("init", t.identifier("setters"), settersArrayExpression),
t.property("init", t.identifier("execute"), executeFunctionExpression)
]));
body.push(moduleReturnStatement);
// runner
var runner = util.template("register", {
MODULE_NAME: t.literal(moduleName),
MODULE_DEPENDENCIES: t.arrayExpression(dependencies),
MODULE_BODY: t.functionExpression(
null,
[this.exportIdentifier],
t.blockStatement(body)
)
});
program.body = [t.expressionStatement(runner)];
};
SystemFormatter.prototype._buildSetters = function () {
// generate setters array expression elements
return _.map(this.importedModule, function (specs) {
if (!specs.length) {
return NULL_SETTER;
}
var expressionStatements = _.map(specs, function (spec) {
var right = SETTER_MODULE_NAMESPACE;
if (!spec.isBatch) {
right = t.memberExpression(right, spec.key);
}
return t.expressionStatement(
t.assignmentExpression("=", spec.variableName, right
)
);
});
return t.functionExpression(
null, [SETTER_MODULE_NAMESPACE], t.blockStatement(expressionStatements)
);
});
};
SystemFormatter.prototype.import = function (node) {
var MODULE_NAME = node.source.value;
this.importedModule[MODULE_NAME] = this.importedModule[MODULE_NAME] || [];
};
SystemFormatter.prototype.importSpecifier = function (specifier, node) {
var variableName = t.getSpecifierName(specifier);
// import foo from "foo";
if (specifier.default) {
specifier.id = DEFAULT_IDENTIFIER;
}
var MODULE_NAME = node.source.value;
this.importedModule[MODULE_NAME] = this.importedModule[MODULE_NAME] || [];
this.importedModule[MODULE_NAME].push({
variableName: variableName,
isBatch: specifier.type === "ImportBatchSpecifier",
key: specifier.id
});
};
SystemFormatter.prototype._export = function (name, identifier) {
this.exportedStatements.push(t.expressionStatement(
t.callExpression(this.exportIdentifier, [t.literal(name), identifier])
));
};
SystemFormatter.prototype.export = function (node, nodes) {
var declar = node.declaration;
var variableName, identifier;
if (node.default) {
// export default foo
variableName = DEFAULT_IDENTIFIER.name;
if (t.isClass(declar) || t.isFunction(declar)) {
if (!declar.id) {
declar.id = this.file.generateUidIdentifier("anonymous");
}
nodes.push(t.toStatement(declar));
declar = declar.id;
}
identifier = declar;
} else if (t.isVariableDeclaration(declar)) {
// export var foo
variableName = declar.declarations[0].id.name;
identifier = declar.declarations[0].id;
nodes.push(declar);
} else {
// export function foo () {}
variableName = declar.id.name;
identifier = declar.id;
nodes.push(declar);
}
this._export(variableName, identifier);
};
SystemFormatter.prototype.exportSpecifier = function (specifier, node) {
var variableName = t.getSpecifierName(specifier);
if (node.source) {
if (t.isExportBatchSpecifier(specifier)) {
// export * from "foo";
var exportIdentifier = t.identifier("exports");
this.exportedStatements.push(
t.variableDeclaration("var", [
t.variableDeclarator(exportIdentifier, this.exportIdentifier)
])
);
this.exportedStatements.push(util.template("exports-wildcard", {
OBJECT: t.identifier(node.source.value)
}, true));
} else {
// export { foo } from "test";
this._export(variableName.name, t.memberExpression(
t.identifier(node.source.value),
specifier.id
));
}
} else {
// export { foo };
this._export(variableName.name, specifier.id);
}
};
|