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import { createFilter, attachScopes, makeLegalIdentifier } from 'rollup-pluginutils';
import { sep } from 'path';
import { walk } from 'estree-walker';
import MagicString from 'magic-string';
const escape = str => {
return str.replace(/[-[\]/{}()*+?.\\^$|]/g, "\\$&");
};
const isReference = (node, parent) => {
if (node.type === "MemberExpression") {
return !node.computed && isReference(node.object, node);
}
if (node.type === "Identifier") {
// TODO is this right?
if (parent.type === "MemberExpression") return parent.computed || node === parent.object;
// disregard the `bar` in { bar: foo }
if (parent.type === "Property" && node !== parent.value) return false;
// disregard the `bar` in `class Foo { bar () {...} }`
if (parent.type === "MethodDefinition") return false;
// disregard the `bar` in `export { foo as bar }`
if (parent.type === "ExportSpecifier" && node !== parent.local) return;
return true;
}
};
const flatten = node => {
const parts = [];
while (node.type === "MemberExpression") {
parts.unshift(node.property.name);
node = node.object;
}
const name = node.name;
parts.unshift(name);
return { name, keypath: parts.join(".") };
};
function inject(options) {
if (!options) throw new Error("Missing options");
const filter = createFilter(options.include, options.exclude);
let modules = options.modules;
if (!modules) {
modules = Object.assign({}, options);
delete modules.include;
delete modules.exclude;
delete modules.sourceMap;
delete modules.sourcemap;
}
const modulesMap = new Map(Object.entries(modules));
// Fix paths on Windows
if (sep !== "/") {
modulesMap.forEach((mod, key) => {
modulesMap.set(
key,
Array.isArray(mod) ? [mod[0].split(sep).join("/"), mod[1]] : mod.split(sep).join("/")
);
});
}
const firstpass = new RegExp(
`(?:${Array.from(modulesMap.keys())
.map(escape)
.join("|")})`,
"g"
);
const sourceMap = options.sourceMap !== false && options.sourcemap !== false;
return {
name: "inject",
transform(code, id) {
if (!filter(id)) return null;
if (code.search(firstpass) === -1) return null;
if (sep !== "/") id = id.split(sep).join("/");
let ast = null;
try {
ast = this.parse(code);
} catch (err) {
this.warn({
code: "PARSE_ERROR",
message: `rollup-plugin-inject: failed to parse ${id}. Consider restricting the plugin to particular files via options.include`
});
}
if (!ast) {
return null;
}
// analyse scopes
let scope = attachScopes(ast, "scope");
const imports = new Set();
ast.body.forEach(node => {
if (node.type === "ImportDeclaration") {
node.specifiers.forEach(specifier => {
imports.add(specifier.local.name);
});
}
});
const magicString = new MagicString(code);
const newImports = new Map();
function handleReference(node, name, keypath) {
let mod = modulesMap.get(keypath);
if (mod && !imports.has(name) && !scope.contains(name)) {
if (typeof mod === "string") mod = [mod, "default"];
// prevent module from importing itself
if (mod[0] === id) return;
const hash = `${keypath}:${mod[0]}:${mod[1]}`;
const importLocalName =
name === keypath ? name : makeLegalIdentifier(`$inject_${keypath}`);
if (!newImports.has(hash)) {
if (mod[1] === "*") {
newImports.set(hash, `import * as ${importLocalName} from '${mod[0]}';`);
} else {
newImports.set(hash, `import { ${mod[1]} as ${importLocalName} } from '${mod[0]}';`);
}
}
if (name !== keypath) {
magicString.overwrite(node.start, node.end, importLocalName, {
storeName: true
});
}
return true;
}
}
walk(ast, {
enter(node, parent) {
if (sourceMap) {
magicString.addSourcemapLocation(node.start);
magicString.addSourcemapLocation(node.end);
}
if (node.scope) scope = node.scope;
// special case – shorthand properties. because node.key === node.value,
// we can't differentiate once we've descended into the node
if (node.type === "Property" && node.shorthand) {
const name = node.key.name;
handleReference(node, name, name);
return this.skip();
}
if (isReference(node, parent)) {
const { name, keypath } = flatten(node);
const handled = handleReference(node, name, keypath);
if (handled) return this.skip();
}
},
leave(node) {
if (node.scope) scope = scope.parent;
}
});
if (newImports.size === 0) {
return {
code,
ast,
map: sourceMap ? magicString.generateMap({ hires: true }) : null
};
}
const importBlock = Array.from(newImports.values()).join("\n\n");
magicString.prepend(importBlock + "\n\n");
return {
code: magicString.toString(),
map: sourceMap ? magicString.generateMap({ hires: true }) : null
};
}
};
}
export default inject;
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