Spaces:
Running
Running
File size: 7,731 Bytes
1df763a |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 |
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
exports.ensure = ensure;
exports.get = get;
exports.getDependencies = getDependencies;
exports.list = void 0;
exports.minVersion = minVersion;
var _traverse = require("@babel/traverse");
var _t = require("@babel/types");
var _helpers = require("./helpers.js");
const {
assignmentExpression,
cloneNode,
expressionStatement,
file,
identifier
} = _t;
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(".");
}
let FileClass = undefined;
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 = [];
const dependencyVisitor = {
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() || !decl.node.id) {
throw decl.buildCodeFrameError("Helpers can only export named function declarations");
}
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.isImportDeclaration() || child.isExportDeclaration()) return;
child.skip();
}
};
const referenceVisitor = {
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);
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 != null && binding.scope.path.isProgram()) {
exportBindingAssignments.push(makePath(child));
}
}
};
(0, _traverse.default)(file.ast, dependencyVisitor, file.scope);
(0, _traverse.default)(file.ast, referenceVisitor, file.scope);
if (!exportPath) throw new Error("Helpers must have a default export.");
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 || []);
if (id.type === "Identifier") bindings.add(id.name);
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;
}
const {
path
} = file;
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") {
exp.replaceWith(decl);
} else if (id.type === "MemberExpression") {
exportBindingAssignments.forEach(assignPath => {
const assign = path.get(assignPath);
assign.replaceWith(assignmentExpression("=", id, assign.node));
});
exp.replaceWith(decl);
path.pushContainer("body", expressionStatement(assignmentExpression("=", id, identifier(exportName))));
} 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 = cloneNode(dependenciesRefs[path.node.name]);
path.replaceWith(node);
}
}
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 ${name}`), {
code: "BABEL_HELPER_UNKNOWN",
helper: name
});
}
const fn = () => {
{
if (!FileClass) {
const fakeFile = {
ast: file(helper.ast()),
path: null
};
(0, _traverse.default)(fakeFile.ast, {
Program: path => (fakeFile.path = path).stop()
});
return fakeFile;
}
}
return new FileClass({
filename: `babel-helper://${name}`
}, {
ast: file(helper.ast()),
code: "[internal Babel helper code]",
inputMap: null
});
};
let metadata = null;
helperData[name] = {
minVersion: helper.minVersion,
build(getDependency, id, localBindings) {
const file = fn();
metadata || (metadata = getHelperMetadata(file));
permuteHelperAST(file, metadata, id, localBindings, getDependency);
return {
nodes: file.ast.program.body,
globals: metadata.globals
};
},
getDependencies() {
metadata || (metadata = getHelperMetadata(fn()));
return Array.from(metadata.dependencies.values());
}
};
}
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 loadHelper(name).getDependencies();
}
function ensure(name, newFileClass) {
FileClass || (FileClass = newFileClass);
loadHelper(name);
}
const list = exports.list = Object.keys(_helpers.default).map(name => name.replace(/^_/, ""));
var _default = exports.default = get;
//# sourceMappingURL=index.js.map
|