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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at
from __future__ import print_function
import os
import re
import shutil
import sys
import yaml
# Skip all common files used to support tests for jstests
# These files are listed in the README.txt
r"/\*\---\n([\s]*)((?:\s|\S)*)[\n\s*]---\*/", flags=re.DOTALL
def convertTestFile(source, includes):
Convert a jstest test to a compatible Test262 test file.
source = convertReportCompare(source)
source = updateMeta(source, includes)
source = insertCopyrightLines(source)
return source
def convertReportCompare(source):
Captures all the reportCompare and convert them accordingly.
Cases with reportCompare calls where the arguments are the same and one of
0, true, or null, will be discarded as they are not necessary for Test262.
Otherwise, reportCompare will be replaced with assert.sameValue, as the
equivalent in Test262
def replaceFn(matchobj):
actual =
expected =
if actual == expected and actual in ["0", "true", "null"]:
return ""
newSource = re.sub(
return re.sub(r"\breportCompare\b", "assert.sameValue", newSource)
def fetchReftestEntries(reftest):
Collects and stores the entries from the reftest header.
# TODO: fails, slow, skip, random, random-if
features = []
error = None
comments = None
module = False
# should capture conditions to skip
matchesSkip ="skip-if\((.*)\)", reftest)
if matchesSkip:
matches ="||")
for match in matches:
# captures a features list
dependsOnProp =
r"!this.hasOwnProperty\([\'\"](.*?)[\'\"]\)", match
if dependsOnProp:
print("# Can't parse the following skip-if rule: %s" % match)
# should capture the expected error
matchesError ="error:\s*(\w*)", reftest)
if matchesError:
# The metadata from the reftests won't say if it's a runtime or an
# early error. This specification is required for the frontmatter tags.
error =
# just tells if it's a module
matchesModule ="\bmodule\b", reftest)
if matchesModule:
module = True
# captures any comments
matchesComments =" -- (.*)", reftest)
if matchesComments:
comments =
return {"features": features, "error": error, "module": module, "info": comments}
def parseHeader(source):
Parse the source to return it with the extracted the header
from lib.manifest import TEST_HEADER_PATTERN_INLINE
# Bail early if we do not start with a single comment.
if not source.startswith("//"):
return (source, {})
# Extract the token.
part, _, _ = source.partition("\n")
matches = TEST_HEADER_PATTERN_INLINE.match(part)
if matches and
reftest =
# Remove the found header from the source;
# Fetch and return the reftest entries
return (source.replace(reftest + "\n", ""), fetchReftestEntries(reftest))
return (source, {})
def extractMeta(source):
Capture the frontmatter metadata as yaml if it exists.
Returns a new dict if it doesn't.
match =
if not match:
return {}
indent, frontmatter_lines = match.groups()
unindented = re.sub("^%s" % indent, "", frontmatter_lines)
return yaml.safe_load(unindented)
def updateMeta(source, includes):
Captures the reftest meta and a pre-existing meta if any and merge them
into a single dict.
# Extract the reftest data from the source
source, reftest = parseHeader(source)
# Extract the frontmatter data from the source
frontmatter = extractMeta(source)
# Merge the reftest and frontmatter
merged = mergeMeta(reftest, frontmatter, includes)
# Cleanup the metadata
properData = cleanupMeta(merged)
return insertMeta(source, properData)
def cleanupMeta(meta):
Clean up all the frontmatter meta tags. This is not a lint tool, just a
simple cleanup to remove trailing spaces and duplicate entries from lists.
# Populate required tags
for tag in ("description", "esid"):
meta.setdefault(tag, "pending")
# Trim values on each string tag
for tag in ("description", "esid", "es5id", "es6id", "info", "author"):
if tag in meta:
meta[tag] = meta[tag].strip()
# Remove duplicate entries on each list tag
for tag in ("features", "flags", "includes"):
if tag in meta:
# We need the list back for the yaml dump
meta[tag] = list(set(meta[tag]))
if "negative" in meta:
# If the negative tag exists, phase needs to be present and set
if meta["negative"].get("phase") not in ("early", "runtime"):
"Warning: the negative.phase is not properly set.\n"
# If the negative tag exists, type is required
if "type" not in meta["negative"]:
"Warning: the negative.type is not set.\n"
return meta
def mergeMeta(reftest, frontmatter, includes):
Merge the metadata from reftest and an existing frontmatter and populate
required frontmatter fields properly.
# Merge the meta from reftest to the frontmatter
if "features" in reftest:
frontmatter.setdefault("features", []).extend(reftest.get("features", []))
# Only add the module flag if the value from reftest is truish
if reftest.get("module"):
frontmatter.setdefault("flags", []).append("module")
# Add any comments to the info tag
info = reftest.get("info")
if info:
# Open some space in an existing info text
if "info" in frontmatter:
frontmatter["info"] += "\n\n \%s" % info
frontmatter["info"] = info
# Set the negative flags
if "error" in reftest:
error = reftest["error"]
if "negative" not in frontmatter:
frontmatter["negative"] = {
# This code is assuming error tags are early errors, but they
# might be runtime errors as well.
# From this point, this code can also print a warning asking to
# specify the error phase in the generated code or fill the
# phase with an empty string.
"phase": "early",
"type": error,
# Print a warning if the errors don't match
elif frontmatter["negative"].get("type") != error:
"Warning: The reftest error doesn't match the existing "
+ "frontmatter error. %s != %s"
% (error, frontmatter["negative"]["type"])
# Add the shell specific includes
if includes:
frontmatter["includes"] = list(includes)
return frontmatter
def insertCopyrightLines(source):
Insert the copyright lines into the file.
from datetime import date
lines = []
if not re.match(r"\/\/\s+Copyright.*\. All rights reserved.", source):
year =
"// Copyright (C) %s Mozilla Corporation. All rights reserved." % year
"// This code is governed by the BSD license found in the LICENSE file."
return "\n".join(lines) + source
def insertMeta(source, frontmatter):
Insert the formatted frontmatter into the file, use the current existing
space if any
lines = []
for (key, value) in frontmatter.items():
if key in ("description", "info"):
lines.append("%s: |" % key)
" "
+ yaml.dump(
.replace("\n...", "")
{key: value}, encoding="utf8", default_flow_style=False
match =
if match:
return source.replace(, "\n".join(lines))
return "\n".join(lines) + source
def findAndCopyIncludes(dirPath, baseDir, includeDir):
relPath = os.path.relpath(dirPath, baseDir)
includes = []
# Recurse down all folders in the relative path until
# we reach the base directory of shell.js include files.
# Each directory will have a shell.js file to copy.
while relPath:
# find the shell.js
shellFile = os.path.join(baseDir, relPath, "shell.js")
# create new shell.js file name
includeFileName = relPath.replace("/", "-") + "-shell.js"
includesPath = os.path.join(includeDir, includeFileName)
if os.path.exists(shellFile):
# if the file exists, include in includes
if not os.path.exists(includesPath):
shutil.copyfile(shellFile, includesPath)
relPath = os.path.split(relPath)[0]
shellFile = os.path.join(baseDir, "shell.js")
includesPath = os.path.join(includeDir, "shell.js")
if not os.path.exists(includesPath):
shutil.copyfile(shellFile, includesPath)
if not os.path.exists(includesPath):
shutil.copyfile(shellFile, includesPath)
return includes
def exportTest262(args):
outDir = os.path.abspath(args.out)
providedSrcs = args.src
includeShell = args.exportshellincludes
baseDir = os.getcwd()
# Create the output directory from scratch.
if os.path.isdir(outDir):
# only make the includes directory if requested
includeDir = os.path.join(outDir, "harness-includes")
if includeShell:
# Go through each source path
for providedSrc in providedSrcs:
src = os.path.abspath(providedSrc)
# the basename of the path will be used in case multiple "src" arguments
# are passed in to create an output directory for each "src".
basename = os.path.basename(src)
# Process all test directories recursively.
for (dirPath, _, fileNames) in os.walk(src):
# we need to make and get the unique set of includes for this filepath
includes = []
if includeShell:
includes = findAndCopyIncludes(dirPath, baseDir, includeDir)
relPath = os.path.relpath(dirPath, src)
fullRelPath = os.path.join(basename, relPath)
# Make new test subdirectory to seperate from includes
currentOutDir = os.path.join(outDir, "tests", fullRelPath)
# This also creates the own outDir folder
if not os.path.exists(currentOutDir):
for fileName in fileNames:
# Skip browser.js files
if fileName == "browser.js" or fileName == "shell.js":
filePath = os.path.join(dirPath, fileName)
testName = os.path.join(
fullRelPath, fileName
) # captures folder(s)+filename
# Copy non-test files as is.
(_, fileExt) = os.path.splitext(fileName)
if fileExt != ".js":
shutil.copyfile(filePath, os.path.join(currentOutDir, fileName))
print("C %s" % testName)
# Read the original test source and preprocess it for Test262
with open(filePath, "rb") as testFile:
testSource =
if not testSource:
print("SKIPPED %s" % testName)
newSource = convertTestFile(testSource, includes)
with open(os.path.join(currentOutDir, fileName), "wb") as output:
print("SAVED %s" % testName)
if __name__ == "__main__":
import argparse
# This script must be run from js/src/tests to work correctly.
if "/".join(os.path.normpath(os.getcwd()).split(os.sep)[-3:]) != "js/src/tests":
raise RuntimeError("%s must be run from js/src/tests" % sys.argv[0])
parser = argparse.ArgumentParser(
description="Export tests to match Test262 file compliance."
help="Output directory. Any existing directory will be removed! "
"(default: %(default)s)",
help="Optionally export shell.js files as includes in exported tests. "
"Only use for testing, do not use for exporting to test262 (test262 tests "
"should have as few dependencies as possible).",
"src", nargs="+", help="Source folder with test files to export"
args = parser.parse_args()