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add runtimeES3 transformer

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This commit is contained in:
Sebastian McKenzie
2015-03-31 01:20:14 +11:00
parent 12f8fa229d
commit 1c7fabdd6d
13 changed files with 176 additions and 148 deletions
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101
src/babel/transformation/helpers/build-runtime-transformer.js Normal file
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@@ -0,0 +1,101 @@
import includes from "lodash/collection/includes";
import * as util from "../../util";
import has from "lodash/object/has";
import * as t from "../../types";
var isSymbolIterator = t.buildMatchMemberExpression("Symbol.iterator");
var ALIASABLE_CONSTRUCTORS = [
"Symbol",
"Promise",
"Map",
"WeakMap",
"Set",
"WeakSet"
];
export default function (exports, core, prefix) {
var moduleName = `babel-runtime/${prefix}`;
function coreHas(node) {
return node.name !== "_" && has(core, node.name);
}
var astVisitor = {
enter(node, parent, scope, file) {
var prop;
if (this.isMemberExpression() && this.isReferenced()) {
// Array.from -> _core.Array.from
var obj = node.object;
prop = node.property;
if (!t.isReferenced(obj, node)) return;
if (!node.computed && coreHas(obj) && has(core[obj.name], prop.name) && !scope.getBindingIdentifier(obj.name)) {
this.skip();
return t.prependToMemberExpression(node, file.get("coreIdentifier"));
}
} else if (this.isReferencedIdentifier() && !t.isMemberExpression(parent) && includes(ALIASABLE_CONSTRUCTORS, node.name) && !scope.getBindingIdentifier(node.name)) {
// Symbol() -> _core.Symbol(); new Promise -> new _core.Promise
return t.memberExpression(file.get("coreIdentifier"), node);
} else if (this.isCallExpression()) {
// arr[Symbol.iterator]() -> _core.$for.getIterator(arr)
var callee = node.callee;
if (node.arguments.length) return false;
if (!t.isMemberExpression(callee)) return false;
if (!callee.computed) return false;
prop = callee.property;
if (!isSymbolIterator(prop)) return false;
return util.template("corejs-iterator", {
CORE_ID: file.get("coreIdentifier"),
VALUE: callee.object
});
} else if (this.isBinaryExpression()) {
// Symbol.iterator in arr -> core.$for.isIterable(arr)
if (node.operator !== "in") return;
var left = node.left;
if (!isSymbolIterator(left)) return;
return util.template("corejs-is-iterator", {
CORE_ID: file.get("coreIdentifier"),
VALUE: node.right
});
}
}
};
exports.metadata = {
optional: true
};
exports.Program = function (node, parent, scope, file) {
this.traverse(astVisitor, file);
};
exports.pre = function (file) {
file.set("helperGenerator", function (name) {
return file.addImport(`${moduleName}/helpers/${name}`, name);
});
file.setDynamic("coreIdentifier", function () {
return file.addImport(`${moduleName}/core-js`, "core");
});
file.setDynamic("regeneratorIdentifier", function () {
return file.addImport(`${moduleName}/regenerator`, "regeneratorRuntime");
});
};
exports.Identifier = function (node, parent, scope, file) {
if (this.isReferencedIdentifier({ name: "regeneratorRuntime" })) {
return file.get("regeneratorIdentifier");
}
};
};

3
src/babel/transformation/transformers/aliases.json
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@@ -1,3 +1,4 @@
{
"useStrict": "strict"
"useStrict": "strict",
"runtimeES5": "runtime"
}

1
src/babel/transformation/transformers/index.js
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@@ -83,6 +83,7 @@ export default {
// needs to be after `regenerator` due to needing `regeneratorRuntime` references
// needs to be after `es6.forOf` due to needing `Symbol.iterator` references
// needs to be before `es6.modules` due to dynamic imports
runtimeES3: require("./other/runtime-es3"),
runtime: require("./other/runtime"),
// needs to be before `_blockHoist` due to function hoisting etc

4
src/babel/transformation/transformers/other/runtime-es3.js Normal file
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@@ -0,0 +1,4 @@
import core from "core-js/client/library";
import buildRuntimeTransformer from "../../helpers/build-runtime-transformer";
buildRuntimeTransformer(exports, core, "es3");

103
src/babel/transformation/transformers/other/runtime.js
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@@ -1,103 +1,4 @@
import includes from "lodash/collection/includes";
import * as util from "../../../util";
import core from "core-js/library";
import has from "lodash/object/has";
import * as t from "../../../types";
import buildRuntimeTransformer from "../../helpers/build-runtime-transformer";
var isSymbolIterator = t.buildMatchMemberExpression("Symbol.iterator");
var coreHas = function (node) {
return node.name !== "_" && has(core, node.name);
};
var ALIASABLE_CONSTRUCTORS = [
"Symbol",
"Promise",
"Map",
"WeakMap",
"Set",
"WeakSet"
];
var astVisitor = {
enter(node, parent, scope, file) {
var prop;
if (this.isMemberExpression() && this.isReferenced()) {
// Array.from -> _core.Array.from
var obj = node.object;
prop = node.property;
if (!t.isReferenced(obj, node)) return;
if (!node.computed && coreHas(obj) && has(core[obj.name], prop.name) && !scope.getBindingIdentifier(obj.name)) {
this.skip();
return t.prependToMemberExpression(node, file.get("coreIdentifier"));
}
} else if (this.isReferencedIdentifier() && !t.isMemberExpression(parent) && includes(ALIASABLE_CONSTRUCTORS, node.name) && !scope.getBindingIdentifier(node.name)) {
// Symbol() -> _core.Symbol(); new Promise -> new _core.Promise
return t.memberExpression(file.get("coreIdentifier"), node);
} else if (this.isCallExpression()) {
// arr[Symbol.iterator]() -> _core.$for.getIterator(arr)
var callee = node.callee;
if (node.arguments.length) return false;
if (!t.isMemberExpression(callee)) return false;
if (!callee.computed) return false;
prop = callee.property;
if (!isSymbolIterator(prop)) return false;
return util.template("corejs-iterator", {
CORE_ID: file.get("coreIdentifier"),
VALUE: callee.object
});
} else if (this.isBinaryExpression()) {
// Symbol.iterator in arr -> core.$for.isIterable(arr)
if (node.operator !== "in") return;
var left = node.left;
if (!isSymbolIterator(left)) return;
return util.template("corejs-is-iterator", {
CORE_ID: file.get("coreIdentifier"),
VALUE: node.right
});
}
}
};
export var metadata = {
optional: true,
react: true
};
export function manipulateOptions(opts) {
if (opts.whitelist) opts.whitelist.push("es6.modules");
}
export function Program(node, parent, scope, file) {
this.traverse(astVisitor, file);
}
export function pre(file) {
file.set("helperGenerator", function (name) {
return file.addImport("babel-runtime/helpers/" + name, name);
});
file.setDynamic("coreIdentifier", function () {
return file.addImport("babel-runtime/core-js", "core");
});
file.setDynamic("regeneratorIdentifier", function () {
return file.addImport("babel-runtime/regenerator", "regeneratorRuntime");
});
}
export function Identifier(node, parent, scope, file) {
if (this.isReferencedIdentifier({ name: "regeneratorRuntime" })) {
return file.get("regeneratorIdentifier");
}
}
buildRuntimeTransformer(exports, core, "es5");