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const cp = require('child_process');
const fs = require('fs');
const path = require('path');
const recast = require('recast');
const uniqueTempDir = require('unique-temp-dir');
const Agent = require('./Agent');
const inception = require('./inception');
const writeSources = require('./write-sources');
const ErrorParser = require('./parse-error');
const {
getDependencies,
// escapeModuleSpecifier,
hasModuleSpecifier,
rawSource
} = require('./dependencies');
const {
ChildProcess
} = cp;
const CHILD_PROCESS = Symbol.for('cp');
const TEMP_PATH = Symbol.for('tp');
function generateTempFileName() {
const now = Date.now();
return `f-${now}-${process.pid}-${(Math.random() * 0x100000000 + 1).toString(36)}.js`;
}
const ESHostErrorSource = `
function ESHostError(message) {
this.message = message || "";
}
ESHostError.prototype.toString = function () {
return "ESHostError: " + this.message;
};
ESHostError.thrower = (...args) => {
throw new ESHostError(...args);
};
var $ERROR = ESHostError.thrower;
function $DONOTEVALUATE() {
throw "ESHost: This statement should not be evaluated.";
}
`;
const isMissingTest262ErrorDefinition = header => {
if (!header.includes('Test262Error')) {
return false;
}
try {
const f = new Function(`${header}; return typeof Test262Error == 'undefined';`);
return f();
} catch (error) {
return false;
}
};
const useESHostError = (code) => {
return `${ESHostErrorSource}${code}`.replace(/Test262Error/gm, 'ESHostError');
};
class ConsoleAgent extends Agent {
constructor(options) {
super(options);
this.isStopped = false;
this.printCommand = 'print';
this.cpOptions = {};
// Promise for the child process created by the most
// recent invocation of `evalScript`
Object.defineProperties(this, {
[CHILD_PROCESS]: {
value: null,
writable: true,
enumerable: false
},
[TEMP_PATH]: {
value: uniqueTempDir(),
writable: true,
enumerable: false
}
});
}
async createChildProcess(args = [], options = {}) {
this.hasFinishedCreatingChildProcess = false;
Iif (this.isStopped) {
return null;
}
try {
return cp.spawn(
this.hostPath,
this.args.concat(args),
{
...this.cpOptions,
...options,
detached: true
}
);
} catch (error) {
return this.createChildProcess(args, options);
}
}
async evalScript(code, options = {}) {
this.isStopped = false;
let tempfile = path.join(this[TEMP_PATH], generateTempFileName());
let temppath = this[TEMP_PATH];
let isExpectingRawSource = false;
let hasDependencies = false;
const sources = [];
const dependencies = [];
if (this.out) {
tempfile = tempfile.replace(temppath, this.out);
temppath = this.out;
}
// When evalScript is called with a test262-stream test record:
if (typeof code === 'object' && code.contents) {
let {attrs, contents, file} = code;
isExpectingRawSource = !!attrs.flags.raw;
let { phase = '', type = '' } = attrs.negative || {};
let isEarlySyntaxError = (phase === 'early' || phase === 'parse') && type === 'SyntaxError';
let sourcebase = path.basename(file);
// If the main test file isn't a negative: SyntaxError,
// then we can proceed with checking for importable files
if (!isEarlySyntaxError) {
dependencies.push(...getDependencies(file, [sourcebase]));
hasDependencies = dependencies.length > 0;
}
if (dependencies.length === 1 && dependencies[0] === sourcebase) {
dependencies.length = 0;
hasDependencies = false;
}
if (options.module || attrs.flags.module ||
hasModuleSpecifier(contents)) {
// When testing module or dynamic import code that imports itself,
// we must copy the test file with its actual name.
tempfile = path.join(temppath, sourcebase);
}
// The test record in "code" is no longer needed and
// all further operations expect the "code" argument to be
// a string, make that true for back-compat.
code = contents;
}
// If test record explicitly indicates that this test should be
// treated as raw source only, then it does not need to be
// further "compiled".
if (!isExpectingRawSource) {
code = this.compile(code);
}
// Add the entry point source to the list of source to create.
//
// "tempfile" will be either:
//
// - A generated temporary file name, if evalScript received
// raw source code.
// - The file name of the test being executed, but within
// the os's temporary file directory
sources.push([ tempfile, code ]);
// If any dependencies were discovered, there will be
if (hasDependencies) {
// Prepare dependencies for use:
//
// 1. Make an absolute path for the dependency file.
// 2. Get the dependency's source from the rawSource cache
// 3. Push the dependency and source into the sources to be written.
//
dependencies.forEach(file => {
let absname = path.join(temppath, file);
let depsource = rawSource.get(path.basename(file));
// Sometimes a test file might want to import itself,
// which is a valid exercise of the import semantics.
// Here we avoid adding the test file more than once.
if (absname !== tempfile) {
sources.push([
absname,
depsource
]);
}
});
}
await writeSources(sources);
let stdout = '';
let stderr = '';
let error = null;
if (this.isStopped) {
return {
stderr,
stdout,
error
};
}
this[CHILD_PROCESS] = await this.createChildProcess([tempfile]);
this.hasFinishedCreatingChildProcess = true;
Iif (this.isStopped && this[CHILD_PROCESS] === null) {
return {
stderr,
stdout,
error
};
}
this[CHILD_PROCESS].stdout.on('data', str => { stdout += str; });
this[CHILD_PROCESS].stderr.on('data', str => { stderr += str; });
await new Promise(resolve => {
this[CHILD_PROCESS].on('close', (code, signal) => {
Iif (signal && signal !== 'SIGKILL') {
stderr += `\nError: Received unexpected signal: ${signal}`;
}
resolve();
});
});
sources.forEach(({0: file}) => fs.unlink(file, () => { /* ignore */ }));
// try {
// process.kill(this[CHILD_PROCESS].pid + 1);
// } catch (error) {}
const result = this.normalizeResult({ stderr, stdout });
result.error = this.parseError(result.stderr);
return result;
}
stop() {
let stoppedAnActiveChildProcess = false;
this.isStopped = true;
// This must be sync
if (this.hasFinishedCreatingChildProcess && this[CHILD_PROCESS] instanceof ChildProcess) {
this[CHILD_PROCESS].stdin.end();
this[CHILD_PROCESS].stdout.destroy();
this[CHILD_PROCESS].stderr.destroy();
this[CHILD_PROCESS].kill('SIGKILL');
stoppedAnActiveChildProcess = true;
}
// killing is fast, don't bother waiting for it
return Promise.resolve(stoppedAnActiveChildProcess);
}
// console agents need to kill the process before exiting.
async destroy() {
return this.stop();
}
compile(code, options) {
code = super.compile(code, options);
let runtime = this.constructor.runtime;
let { options: hostOptions } = this;
Eif (runtime) {
let ast = recast.parse(runtime);
recast.visit(ast, {
visitNode(node) {
// Remove comments from runtime source
if (node.value.comments) {
node.value.comments.length = 0;
}
if (hostOptions.shortName) {
// Replace $ in runtime source
if (node.value.type === 'Identifier' &&
node.value.name === '$262') {
node.value.name = hostOptions.shortName;
}
}
this.traverse(node);
}
});
runtime = recast.print(ast).code;
}
runtime = inception(runtime.replace(/\r?\n/g, '').replace(/\s+/gm, ' '));
Iif (!runtime) {
return code;
} else {
const prologue = code.match(/^("[^\r\n"]*"|'[^\r\n']*'|[\s\r\n;]*|\/\*[\w\W]*?\*\/|\/\/[^\n]*\n)*/);
const header = prologue
? prologue[0] + runtime
: runtime;
const body = prologue
? code.slice(prologue[0].length)
: code;
const compiledCode = `${header}${body}`;
if (isMissingTest262ErrorDefinition(header)) {
return useESHostError(compiledCode);
}
return compiledCode;
}
}
// Normalizes raw output from a console host. Default is no normalization.
normalizeResult(result) { return result; }
parseError(str) {
return ErrorParser.parse(str);
}
}
ConsoleAgent.runtime = `
/* This is not the agent you're looking for */
const name = 'ConsoleAgent';
`;
module.exports = ConsoleAgent;
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