(fix landed)Revert of Closure: remove older, original GYP compilation system

third_party/closure_compiler/compile.py

+#!/usr/bin/python
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Runs Closure compiler on JavaScript files to check for errors and produce
+minified output."""
+
+import argparse
+import os
+import re
+import subprocess
+import sys
+import tempfile
+
+import build.inputs
+import processor
+import error_filter
+
+
+_CURRENT_DIR = os.path.join(os.path.dirname(__file__))
+
+
+class Checker(object):
+  """Runs the Closure compiler on given source files to typecheck them
+  and produce minified output."""
+
+  _JAR_COMMAND = [
+    "java",
+    "-jar",
+    "-Xms1024m",
+    "-client",
+    "-XX:+TieredCompilation"
+  ]
+
+  _MAP_FILE_FORMAT = "%s.map"
+
+  def __init__(self, verbose=False):
+    """
+    Args:
+      verbose: Whether this class should output diagnostic messages.
+    """
+    self._compiler_jar = os.path.join(_CURRENT_DIR, "compiler", "compiler.jar")
+    self._temp_files = []
+    self._verbose = verbose
+    self._error_filter = error_filter.PromiseErrorFilter()
+
+  def _nuke_temp_files(self):
+    """Deletes any temp files this class knows about."""
+    if not self._temp_files:
+      return
+
+    self._log_debug("Deleting temp files: %s" % ", ".join(self._temp_files))
+    for f in self._temp_files:
+      os.remove(f)
+    self._temp_files = []
+
+  def _log_debug(self, msg, error=False):
+    """Logs |msg| to stdout if --verbose/-v is passed when invoking this script.
+
+    Args:
+      msg: A debug message to log.
+    """
+    if self._verbose:
+      print "(INFO) %s" % msg
+
+  def _log_error(self, msg):
+    """Logs |msg| to stderr regardless of --flags.
+
+    Args:
+      msg: An error message to log.
+    """
+    print >> sys.stderr, "(ERROR) %s" % msg
+
+  def _run_jar(self, jar, args):
+    """Runs a .jar from the command line with arguments.
+
+    Args:
+      jar: A file path to a .jar file
+      args: A list of command line arguments to be passed when running the .jar.
+
+    Return:
+      (exit_code, stderr) The exit code of the command (e.g. 0 for success) and
+          the stderr collected while running |jar| (as a string).
+    """
+    shell_command = " ".join(self._JAR_COMMAND + [jar] + args)
+    self._log_debug("Running jar: %s" % shell_command)
+
+    devnull = open(os.devnull, "w")
+    kwargs = {"stdout": devnull, "stderr": subprocess.PIPE, "shell": True}
+    process = subprocess.Popen(shell_command, **kwargs)
+    _, stderr = process.communicate()
+    return process.returncode, stderr
+
+  def _get_line_number(self, match):
+    """When chrome is built, it preprocesses its JavaScript from:
+
+      <include src="blah.js">
+      alert(1);
+
+    to:
+
+      /* contents of blah.js inlined */
+      alert(1);
+
+    Because Closure Compiler requires this inlining already be done (as
+    <include> isn't valid JavaScript), this script creates temporary files to
+    expand all the <include>s.
+
+    When type errors are hit in temporary files, a developer doesn't know the
+    original source location to fix. This method maps from /tmp/file:300 back to
+    /original/source/file:100 so fixing errors is faster for developers.
+
+    Args:
+      match: A re.MatchObject from matching against a line number regex.
+
+    Returns:
+      The fixed up /file and :line number.
+    """
+    real_file = self._processor.get_file_from_line(match.group(1))
+    return "%s:%d" % (os.path.abspath(real_file.file), real_file.line_number)
+
+  def _filter_errors(self, errors):
+    """Removes some extraneous errors. For example, we ignore:
+
+      Variable x first declared in /tmp/expanded/file
+
+    Because it's just a duplicated error (it'll only ever show up 2+ times).
+    We also ignore Promose-based errors:
+
+      found   : function (VolumeInfo): (Promise<(DirectoryEntry|null)>|null)
+      required: (function (Promise<VolumeInfo>): ?|null|undefined)
+
+    as templates don't work with Promises in all cases yet. See
+    https://github.com/google/closure-compiler/issues/715 for details.
+
+    Args:
+      errors: A list of string errors extracted from Closure Compiler output.
+
+    Return:
+      A slimmer, sleeker list of relevant errors (strings).
+    """
+    first_declared_in = lambda e: " first declared in " not in e
+    return self._error_filter.filter(filter(first_declared_in, errors))
+
+  def _clean_up_error(self, error):
+    """Reverse the effects that funky <include> preprocessing steps have on
+    errors messages.
+
+    Args:
+      error: A Closure compiler error (2 line string with error and source).
+
+    Return:
+      The fixed up error string.
+    """
+    expanded_file = self._expanded_file
+    fixed = re.sub("%s:(\d+)" % expanded_file, self._get_line_number, error)
+    return fixed.replace(expanded_file, os.path.abspath(self._file_arg))
+
+  def _format_errors(self, errors):
+    """Formats Closure compiler errors to easily spot compiler output.
+
+    Args:
+      errors: A list of strings extracted from the Closure compiler's output.
+
+    Returns:
+      A formatted output string.
+    """
+    contents = "\n## ".join("\n\n".join(errors).splitlines())
+    return "## %s" % contents if contents else ""
+
+  def _create_temp_file(self, contents):
+    """Creates an owned temporary file with |contents|.
+
+    Args:
+      content: A string of the file contens to write to a temporary file.
+
+    Return:
+      The filepath of the newly created, written, and closed temporary file.
+    """
+    with tempfile.NamedTemporaryFile(mode="wt", delete=False) as tmp_file:
+      self._temp_files.append(tmp_file.name)
+      tmp_file.write(contents)
+    return tmp_file.name
+
+  def _run_js_check(self, sources, out_file, externs=None,
+                    closure_args=None):
+    """Check |sources| for type errors.
+
+    Args:
+      sources: Files to check.
+      out_file: A file where the compiled output is written to.
+      externs: @extern files that inform the compiler about custom globals.
+      closure_args: Arguments passed directly to the Closure compiler.
+
+    Returns:
+      (errors, stderr) A parsed list of errors (strings) found by the compiler
+          and the raw stderr (as a string).
+    """
+    args = ["--js=%s" % s for s in sources]
+
+    assert out_file
+
+    out_dir = os.path.dirname(out_file)
+    if not os.path.exists(out_dir):
+      os.makedirs(out_dir)
+
+    checks_only = 'checks_only' in closure_args
+
+    if not checks_only:
+      args += ["--js_output_file=%s" % out_file]
+      args += ["--create_source_map=%s" % (self._MAP_FILE_FORMAT % out_file)]
+
+    args += ["--externs=%s" % e for e in externs or []]
+
+    closure_args = closure_args or []
+    closure_args += ["summary_detail_level=3", "continue_after_errors"]
+    args += ["--%s" % arg for arg in closure_args]
+
+    self._log_debug("Args: %s" % " ".join(args))
+
+    _, stderr = self._run_jar(self._compiler_jar, args)
+
+    errors = stderr.strip().split("\n\n")
+    maybe_summary = errors.pop()
+
+    if re.search(".*error.*warning.*typed", maybe_summary):
+      self._log_debug("Summary: %s" % maybe_summary)
+    else:
+      # Not a summary. Running the jar failed. Bail.
+      self._log_error(stderr)
+      self._nuke_temp_files()
+      sys.exit(1)
+
+    if errors:
+      if os.path.exists(out_file):
+        os.remove(out_file)
+      if os.path.exists(self._MAP_FILE_FORMAT % out_file):
+        os.remove(self._MAP_FILE_FORMAT % out_file)
+    elif checks_only:
+      # Compile succeeded but --checks_only disables --js_output_file from
+      # actually writing a file. Write a file ourselves so incremental builds
+      # still work.
+      with open(out_file, 'w') as f:
+        f.write('')
+
+    return errors, stderr
+
+  def check(self, source_file, out_file=None, depends=None, externs=None,
+            closure_args=None):
+    """Closure compiler |source_file| while checking for errors.
+
+    Args:
+      source_file: A file to check.
+      out_file: A file where the compiled output is written to.
+      depends: Files that |source_file| requires to run (e.g. earlier <script>).
+      externs: @extern files that inform the compiler about custom globals.
+      closure_args: Arguments passed directly to the Closure compiler.
+
+    Returns:
+      (found_errors, stderr) A boolean indicating whether errors were found and
+          the raw Closure compiler stderr (as a string).
+    """
+    self._log_debug("FILE: %s" % source_file)
+
+    if source_file.endswith("_externs.js"):
+      self._log_debug("Skipping externs: %s" % source_file)
+      return
+
+    self._file_arg = source_file
+
+    cwd, tmp_dir = os.getcwd(), tempfile.gettempdir()
+    rel_path = lambda f: os.path.join(os.path.relpath(cwd, tmp_dir), f)
+
+    depends = depends or []
+    includes = [rel_path(f) for f in depends + [source_file]]
+    contents = ['<include src="%s">' % i for i in includes]
+    meta_file = self._create_temp_file("\n".join(contents))
+    self._log_debug("Meta file: %s" % meta_file)
+
+    self._processor = processor.Processor(meta_file)
+    self._expanded_file = self._create_temp_file(self._processor.contents)
+    self._log_debug("Expanded file: %s" % self._expanded_file)
+
+    errors, stderr = self._run_js_check([self._expanded_file],
+                                        out_file=out_file, externs=externs,
+                                        closure_args=closure_args)
+    filtered_errors = self._filter_errors(errors)
+    cleaned_errors = map(self._clean_up_error, filtered_errors)
+    output = self._format_errors(cleaned_errors)
+
+    if cleaned_errors:
+      prefix = "\n" if output else ""
+      self._log_error("Error in: %s%s%s" % (source_file, prefix, output))
+    elif output:
+      self._log_debug("Output: %s" % output)
+
+    self._nuke_temp_files()
+    return bool(cleaned_errors), stderr
+
+  def check_multiple(self, sources, out_file=None, externs=None,
+                     closure_args=None):
+    """Closure compile a set of files and check for errors.
+
+    Args:
+      sources: An array of files to check.
+      out_file: A file where the compiled output is written to.
+      externs: @extern files that inform the compiler about custom globals.
+      closure_args: Arguments passed directly to the Closure compiler.
+
+    Returns:
+      (found_errors, stderr) A boolean indicating whether errors were found and
+          the raw Closure Compiler stderr (as a string).
+    """
+    errors, stderr = self._run_js_check(sources, out_file=out_file,
+                                        externs=externs,
+                                        closure_args=closure_args)
+    self._nuke_temp_files()
+    return bool(errors), stderr
+
+
+if __name__ == "__main__":
+  parser = argparse.ArgumentParser(
+      description="Typecheck JavaScript using Closure compiler")
+  parser.add_argument("sources", nargs=argparse.ONE_OR_MORE,
+                      help="Path to a source file to typecheck")
+  single_file_group = parser.add_mutually_exclusive_group()
+  single_file_group.add_argument("--single_file", dest="single_file",
+                                 action="store_true",
+                                 help="Process each source file individually")
+  # TODO(twellington): remove --no_single_file and use len(opts.sources).
+  single_file_group.add_argument("--no_single_file", dest="single_file",
+                                 action="store_false",
+                                 help="Process all source files as a group")
+  parser.add_argument("-d", "--depends", nargs=argparse.ZERO_OR_MORE)
+  parser.add_argument("-e", "--externs", nargs=argparse.ZERO_OR_MORE)
+  parser.add_argument("-o", "--out_file", required=True,
+                      help="A file where the compiled output is written to")
+  parser.add_argument("-c", "--closure_args", nargs=argparse.ZERO_OR_MORE,
+                      help="Arguments passed directly to the Closure compiler")
+  parser.add_argument("-v", "--verbose", action="store_true",
+                      help="Show more information as this script runs")
+
+  parser.set_defaults(single_file=True)
+  opts = parser.parse_args()
+
+  depends = opts.depends or []
+  # TODO(devlin): should we run normpath() on this first and/or do this for
+  # depends as well?
+  externs = set(opts.externs or [])
+  sources = set(opts.sources)
+
+  externs.add(os.path.join(_CURRENT_DIR, "externs", "polymer-1.0.js"))
+
+  checker = Checker(verbose=opts.verbose)
+  if opts.single_file:
+    for source in sources:
+      # Normalize source to the current directory.
+      source = os.path.normpath(os.path.join(os.getcwd(), source))
+      depends, externs = build.inputs.resolve_recursive_dependencies(
+          source, depends, externs)
+
+      found_errors, _ = checker.check(source, out_file=opts.out_file,
+                                      depends=depends, externs=externs,
+                                      closure_args=opts.closure_args)
+      if found_errors:
+        sys.exit(1)
+  else:
+    found_errors, stderr = checker.check_multiple(
+        sources,
+        out_file=opts.out_file,
+        externs=externs,
+        closure_args=opts.closure_args)
+    if found_errors:
+      print stderr
+      sys.exit(1)