setup-python/node_modules/@babel/helpers/lib/index.js
Danny McCormick 39c08a0eaa Initial pass
2019-06-26 21:12:00 -04:00

285 lines
7.9 KiB
JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.get = get;
exports.minVersion = minVersion;
exports.getDependencies = getDependencies;
exports.default = exports.list = void 0;
function _traverse() {
const data = _interopRequireDefault(require("@babel/traverse"));
_traverse = function () {
return data;
};
return data;
}
function t() {
const data = _interopRequireWildcard(require("@babel/types"));
t = function () {
return data;
};
return data;
}
var _helpers = _interopRequireDefault(require("./helpers"));
function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function makePath(path) {
const parts = [];
for (; path.parentPath; path = path.parentPath) {
parts.push(path.key);
if (path.inList) parts.push(path.listKey);
}
return parts.reverse().join(".");
}
function getHelperMetadata(file) {
const globals = new Set();
const localBindingNames = new Set();
const dependencies = new Map();
let exportName;
let exportPath;
const exportBindingAssignments = [];
const importPaths = [];
const importBindingsReferences = [];
(0, _traverse().default)(file, {
ImportDeclaration(child) {
const name = child.node.source.value;
if (!_helpers.default[name]) {
throw child.buildCodeFrameError(`Unknown helper ${name}`);
}
if (child.get("specifiers").length !== 1 || !child.get("specifiers.0").isImportDefaultSpecifier()) {
throw child.buildCodeFrameError("Helpers can only import a default value");
}
const bindingIdentifier = child.node.specifiers[0].local;
dependencies.set(bindingIdentifier, name);
importPaths.push(makePath(child));
},
ExportDefaultDeclaration(child) {
const decl = child.get("declaration");
if (decl.isFunctionDeclaration()) {
if (!decl.node.id) {
throw decl.buildCodeFrameError("Helpers should give names to their exported func declaration");
}
exportName = decl.node.id.name;
}
exportPath = makePath(child);
},
ExportAllDeclaration(child) {
throw child.buildCodeFrameError("Helpers can only export default");
},
ExportNamedDeclaration(child) {
throw child.buildCodeFrameError("Helpers can only export default");
},
Statement(child) {
if (child.isModuleDeclaration()) return;
child.skip();
}
});
(0, _traverse().default)(file, {
Program(path) {
const bindings = path.scope.getAllBindings();
Object.keys(bindings).forEach(name => {
if (name === exportName) return;
if (dependencies.has(bindings[name].identifier)) return;
localBindingNames.add(name);
});
},
ReferencedIdentifier(child) {
const name = child.node.name;
const binding = child.scope.getBinding(name, true);
if (!binding) {
globals.add(name);
} else if (dependencies.has(binding.identifier)) {
importBindingsReferences.push(makePath(child));
}
},
AssignmentExpression(child) {
const left = child.get("left");
if (!(exportName in left.getBindingIdentifiers())) return;
if (!left.isIdentifier()) {
throw left.buildCodeFrameError("Only simple assignments to exports are allowed in helpers");
}
const binding = child.scope.getBinding(exportName);
if (binding && binding.scope.path.isProgram()) {
exportBindingAssignments.push(makePath(child));
}
}
});
if (!exportPath) throw new Error("Helpers must default-export something.");
exportBindingAssignments.reverse();
return {
globals: Array.from(globals),
localBindingNames: Array.from(localBindingNames),
dependencies,
exportBindingAssignments,
exportPath,
exportName,
importBindingsReferences,
importPaths
};
}
function permuteHelperAST(file, metadata, id, localBindings, getDependency) {
if (localBindings && !id) {
throw new Error("Unexpected local bindings for module-based helpers.");
}
if (!id) return;
const {
localBindingNames,
dependencies,
exportBindingAssignments,
exportPath,
exportName,
importBindingsReferences,
importPaths
} = metadata;
const dependenciesRefs = {};
dependencies.forEach((name, id) => {
dependenciesRefs[id.name] = typeof getDependency === "function" && getDependency(name) || id;
});
const toRename = {};
const bindings = new Set(localBindings || []);
localBindingNames.forEach(name => {
let newName = name;
while (bindings.has(newName)) newName = "_" + newName;
if (newName !== name) toRename[name] = newName;
});
if (id.type === "Identifier" && exportName !== id.name) {
toRename[exportName] = id.name;
}
(0, _traverse().default)(file, {
Program(path) {
const exp = path.get(exportPath);
const imps = importPaths.map(p => path.get(p));
const impsBindingRefs = importBindingsReferences.map(p => path.get(p));
const decl = exp.get("declaration");
if (id.type === "Identifier") {
if (decl.isFunctionDeclaration()) {
exp.replaceWith(decl);
} else {
exp.replaceWith(t().variableDeclaration("var", [t().variableDeclarator(id, decl.node)]));
}
} else if (id.type === "MemberExpression") {
if (decl.isFunctionDeclaration()) {
exportBindingAssignments.forEach(assignPath => {
const assign = path.get(assignPath);
assign.replaceWith(t().assignmentExpression("=", id, assign.node));
});
exp.replaceWith(decl);
path.pushContainer("body", t().expressionStatement(t().assignmentExpression("=", id, t().identifier(exportName))));
} else {
exp.replaceWith(t().expressionStatement(t().assignmentExpression("=", id, decl.node)));
}
} else {
throw new Error("Unexpected helper format.");
}
Object.keys(toRename).forEach(name => {
path.scope.rename(name, toRename[name]);
});
for (const path of imps) path.remove();
for (const path of impsBindingRefs) {
const node = t().cloneNode(dependenciesRefs[path.node.name]);
path.replaceWith(node);
}
path.stop();
}
});
}
const helperData = Object.create(null);
function loadHelper(name) {
if (!helperData[name]) {
const helper = _helpers.default[name];
if (!helper) {
throw Object.assign(new ReferenceError(`Unknown helper ${name}`), {
code: "BABEL_HELPER_UNKNOWN",
helper: name
});
}
const fn = () => {
return t().file(helper.ast());
};
const metadata = getHelperMetadata(fn());
helperData[name] = {
build(getDependency, id, localBindings) {
const file = fn();
permuteHelperAST(file, metadata, id, localBindings, getDependency);
return {
nodes: file.program.body,
globals: metadata.globals
};
},
minVersion() {
return helper.minVersion;
},
dependencies: metadata.dependencies
};
}
return helperData[name];
}
function get(name, getDependency, id, localBindings) {
return loadHelper(name).build(getDependency, id, localBindings);
}
function minVersion(name) {
return loadHelper(name).minVersion();
}
function getDependencies(name) {
return Array.from(loadHelper(name).dependencies.values());
}
const list = Object.keys(_helpers.default).map(name => name.replace(/^_/, "")).filter(name => name !== "__esModule");
exports.list = list;
var _default = get;
exports.default = _default;