gecko-dev/layout/style/test/ParseCSS.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:ts=8:et:sw=4:
/* 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 http://mozilla.org/MPL/2.0/. */

/*
 * This file is meant to be used with |#define CSS_REPORT_PARSE_ERRORS|
 * in mozilla/dom/html/style/src/nsCSSScanner.h uncommented, and the
 * |#ifdef DEBUG| block in nsCSSScanner::OutputError (in
 * nsCSSScanner.cpp in the same directory) used (even if not a debug
 * build).
 */

#include "nsXPCOM.h"
#include "nsCOMPtr.h"

#include "nsIFile.h"
#include "nsNetUtil.h"

#include "nsContentCID.h"
#include "mozilla/StyleSheetInlines.h"
#include "mozilla/css/Loader.h"

using namespace mozilla;

static already_AddRefed<nsIURI> FileToURI(const char* aFilename,
                                          nsresult* aRv = 0) {
  nsCOMPtr<nsIFile> lf(do_CreateInstance(NS_LOCAL_FILE_CONTRACTID, aRv));
  NS_ENSURE_TRUE(lf, nullptr);
  // XXX Handle relative paths somehow.
  lf->InitWithNativePath(nsDependentCString(aFilename));

  nsIURI* uri = nullptr;
  nsresult rv = NS_NewFileURI(&uri, lf);
  if (aRv) *aRv = rv;
  return uri;
}

static int ParseCSSFile(nsIURI* aSheetURI) {
  RefPtr<mozilla::css::Loader> = new mozilla::css::Loader();
  RefPtr<CSSStyleSheet> sheet;
  loader->LoadSheetSync(aSheetURI, getter_AddRefs(sheet));
  NS_ASSERTION(sheet, "sheet load failed");
  /* This can happen if the file can't be found (e.g. you
   * ask for a relative path and xpcom/io rejects it)
   */
  if (!sheet) return -1;
  bool complete;
  sheet->GetComplete(complete);
  NS_ASSERTION(complete, "synchronous load did not complete");
  if (!complete) return -2;
  return 0;
}

int main(int argc, char** argv) {
  if (argc < 2) {
    fprintf(stderr, "%s [FILE]...\n", argv[0]);
  }
  nsresult rv = NS_InitXPCOM(nullptr, nullptr, nullptr);
  if (NS_FAILED(rv)) return (int)rv;

  int res = 0;
  for (int i = 1; i < argc; ++i) {
    const char* filename = argv[i];

    printf("\nParsing %s.\n", filename);

    nsCOMPtr<nsIURI> uri = FileToURI(filename, &rv);
    if (rv == NS_ERROR_OUT_OF_MEMORY) {
      fprintf(stderr, "Out of memory.\n");
      return 1;
    }
    if (uri) res = ParseCSSFile(uri);
  }

  NS_ShutdownXPCOM(nullptr);

  return res;
}