# Copyright (C) 2010 Apple Inc. All rights reserved.
#
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# modification, are permitted provided that the following conditions
# are met:
# 1.  Redistributions of source code must retain the above copyright
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#     notice, this list of conditions and the following disclaimer in the
#     documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

"""Functions relating to building WebKit"""

import re


def _should_file_trigger_build(target_platform, file):
    # The directories and patterns lists below map directory names or
    # regexp patterns to the bot platforms for which they should trigger a
    # build. Mapping to the empty list means that no builds should be
    # triggered on any platforms. Earlier directories/patterns take
    # precendence over later ones.

    # FIXME: The patterns below have only been verified to be correct on
    # the platforms listed below. We should implement this for other platforms
    # and start using it for their bots. Someone familiar with each platform
    # will have to figure out what the right set of directories/patterns is for
    # that platform.
    assert(target_platform in ("mac-leopard", "mac-lion", "mac-snowleopard", "win"))

    directories = [
        # Directories that shouldn't trigger builds on any bots.
        ("Examples", []),
        ("PerformanceTests", []),
        ("ManualTests", []),
        ("Tools/BuildSlaveSupport/build.webkit.org-config/public_html", []),
        ("Websites", []),
        ("efl", []),
        ("iphone", []),
        ("opengl", []),
        ("opentype", []),
        ("openvg", []),
        ("wince", []),
        ("wx", []),

        # Directories that should trigger builds on only some bots.
        ("Source/WebCore/image-decoders", ["chromium"]),
        ("LayoutTests/platform/mac", ["mac", "win"]),
        ("cairo", ["gtk", "wincairo"]),
        ("cf", ["chromium-mac", "mac", "qt", "win"]),
        ("chromium", ["chromium"]),
        ("cocoa", ["chromium-mac", "mac"]),
        ("curl", ["gtk", "wincairo"]),
        ("gobject", ["gtk"]),
        ("gpu", ["chromium", "mac"]),
        ("gstreamer", ["gtk"]),
        ("gtk", ["gtk"]),
        ("mac", ["chromium-mac", "mac"]),
        ("mac-leopard", ["mac-leopard"]),
        ("mac-lion", ["mac", "win"]),
        ("mac-snowleopard", ["mac-leopard", "mac-snowleopard"]),
        ("mac-wk2", ["mac-lion", "mac-snowleopard", "win"]),
        ("objc", ["mac"]),
        ("qt", ["qt"]),
        ("skia", ["chromium"]),
        ("soup", ["gtk"]),
        ("v8", ["chromium"]),
        ("win", ["chromium-win", "win"]),
    ]
    patterns = [
        # Patterns that shouldn't trigger builds on any bots.
        (r"(?:^|/)ChangeLog.*$", []),
        (r"(?:^|/)Makefile$", []),
        (r"/ARM", []),
        (r"/CMake.*", []),
        (r"/LICENSE[^/]+$", []),
        (r"ARM(?:v7)?\.(?:cpp|h)$", []),
        (r"MIPS\.(?:cpp|h)$", []),
        (r"WinCE\.(?:cpp|h|mm)$", []),
        (r"\.(?:bkl|mk)$", []),

        # Patterns that should trigger builds on only some bots.
        (r"(?:^|/)GNUmakefile\.am$", ["gtk"]),
        (r"/\w+Chromium\w*\.(?:cpp|h|mm)$", ["chromium"]),
        (r"Mac\.(?:cpp|h|mm)$", ["mac"]),
        (r"\.(?:vcproj|vsprops|sln)$", ["win"]),
        (r"\.exp(?:\.in)?$", ["mac"]),
        (r"\.gypi?", ["chromium"]),
        (r"\.order$", ["mac"]),
        (r"\.pr[io]$", ["qt"]),
        (r"\.vcproj/", ["win"]),
        (r"\.xcconfig$", ["mac"]),
        (r"\.xcodeproj/", ["mac"]),
    ]

    base_platform = target_platform.split("-")[0]

    # See if the file is in one of the known directories.
    for directory, platforms in directories:
        if re.search(r"(?:^|/)%s/" % directory, file):
            return target_platform in platforms or base_platform in platforms

    # See if the file matches a known pattern.
    for pattern, platforms in patterns:
        if re.search(pattern, file):
            return target_platform in platforms or base_platform in platforms

    # See if the file is a platform-specific test result.
    match = re.match("LayoutTests/platform/(?P<platform>[^/]+)/", file)
    if match:
        # See if the file is a test result for this platform, our base
        # platform, or one of our sub-platforms.
        return match.group("platform") in (target_platform, base_platform) or match.group("platform").startswith("%s-" % target_platform)

    # The file isn't one we know about specifically, so we should assume we
    # have to build.
    return True


def should_build(target_platform, changed_files):
    """Returns true if the changed files affect the given platform, and
    thus a build should be performed. target_platform should be one of the
    platforms used in the build.webkit.org master's config.json file."""
    return any(_should_file_trigger_build(target_platform, file) for file in changed_files)
