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compiler.js
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compiler.js
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import FastPath from "./fast-path.js"
import Parser from "./parser.js"
import _createOptions from "./util/create-options.js"
import assignmentVisitor from "./visitor/assignment.js"
import hasPragma from "./parse/has-pragma.js"
import identifierVisitor from "./visitor/identifier.js"
import importExportVisitor from "./visitor/import-export.js"
import stripShebang from "./util/strip-shebang.js"
const defaultOptions = {
cjs: false,
hint: "script",
runtimeAlias: "_",
type: "module",
var: false,
warnings: process.env.NODE_ENV !== "production"
}
const createOptions = (options) => _createOptions(options, Compiler.defaultOptions)
const argumentsRegExp = /\barguments\b/
const importExportRegExp = /\b(?:im|ex)port\b/
class Compiler {
static createOptions = createOptions
static defaultOptions = defaultOptions
static compile(code, options) {
code = stripShebang(code)
options = Compiler.createOptions(options)
let { hint, type } = options
const result = {
code,
data: null,
esm: false,
warnings: null
}
if (type === "unambiguous" &&
hasPragma(code, "use script")) {
type = "script"
}
if (type === "script" &&
! importExportRegExp.test(code)) {
return result
}
if (type === "unambiguous" &&
hint !== "module" &&
! hasPragma(code, "use module") &&
! importExportRegExp.test(code)) {
return result
}
let ast
let error
let threw = true
const parserOptions = {
allowReturnOutsideFunction: options.cjs.topLevelReturn,
sourceType: type === "script" ? type : "module"
}
try {
ast = Parser.parse(code, parserOptions)
threw = false
if (type === "unambiguous") {
type = "module"
}
} catch (e) {
error = e
}
if (threw &&
type === "unambiguous") {
type = parserOptions.sourceType = "script"
try {
ast = Parser.parse(code, parserOptions)
threw = false
} catch (e) {}
}
if (threw) {
throw error
}
const esm = type === "module"
const rootPath = new FastPath(ast)
const { runtimeAlias } = options
importExportVisitor.visit(rootPath, code, {
esm,
generateVarDeclarations: options.var,
runtimeAlias
})
if (importExportVisitor.addedImportExport) {
assignmentVisitor.visit(rootPath, {
exportedLocalNames: importExportVisitor.exportedLocalNames,
importedLocalNames: importExportVisitor.importedLocalNames,
magicString: importExportVisitor.magicString,
runtimeAlias
})
importExportVisitor.finalizeHoisting()
}
if (esm) {
result.esm = true
if (options.warnings &&
argumentsRegExp.test(code)) {
result.warnings = []
identifierVisitor.visit(rootPath, {
magicString: importExportVisitor.magicString,
warnings: result.warnings
})
}
}
result.code = importExportVisitor.magicString.toString()
return result
}
}
Object.setPrototypeOf(Compiler.prototype, null)
export default Compiler