#!/usr/bin/env python
#
# Copyright (C) 2011 Google Inc. All rights reserved.
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# modification, are permitted provided that the following conditions are
# met:
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#    * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#    * Redistributions in binary form must reproduce the above
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# in the documentation and/or other materials provided with the
# distribution.
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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import codecs
import logging
import os
import os.path
import re
import sys

from webkitpy.common.checkout.scm import SCMDetector
from webkitpy.common.system.filesystem import FileSystem
from webkitpy.common.system.executive import Executive
from webkitpy.common.system.logutils import configure_logging
from webkitpy.style.checker import ProcessorBase
from webkitpy.style.filereader import TextFileReader
from webkitpy.style.main import change_directory

_inspector_directory = "Source/WebCore/inspector/front-end"
_localized_strings = "Source/WebCore/English.lproj/localizedStrings.js"

_log = logging.getLogger("check-inspector-strings")

class StringsExtractor(ProcessorBase):
    def __init__(self, patterns):
        self._patterns = patterns
        self.strings = []
        for p in self._patterns:
            self.strings.append([])

    def should_process(self, file_path):
        return file_path.endswith(".js") and (not file_path.endswith("InjectedScript.js"))

    def process(self, lines, file_path, line_numbers=None):
        for line in lines:
            comment_start = line.find("//")
            if comment_start != -1:
                line = line[:comment_start]
            index = 0
            for pattern in self._patterns:
                line_strings = re.findall(pattern, line)
                for string in line_strings:
                    self.strings[index].append(string)
                index += 1

class LocalizedStringsExtractor:
    def __init__(self):
        self.localized_strings = []

    def process_file(self, file_path):
        localized_strings_file = codecs.open(file_path, encoding="utf-8", mode="r")
        try:
            contents = localized_strings_file.read()
            lines = contents.split("\n")
            for line in lines:
                match = re.match(r"localizedStrings\[\"((?:[^\"\\]|\\.)*?)\"", line)
                if match:
                    self.localized_strings.append(match.group(1))
        finally:
            localized_strings_file.close()

def extract_ui_strings(str, out):
    line_unrecognized = False
    idx = 0
    while idx < len(str):
        idx = str.find("WebInspector.UIString(", idx)
        if idx == -1:
            break
        idx = idx + len("WebInspector.UIString(")
        balance = 1
        item_recognized = False
        while idx < len(str):
            if str[idx] == ')':
                balance = balance - 1
                if balance == 0:
                    break
            elif str[idx] == '(':
                balance = balance + 1
            elif balance == 1:
                if str[idx] == ',':
                    break
                elif str[idx] == '"':
                    str_idx = idx + 1
                    while str_idx < len(str):
                        if str[str_idx] == '\\':
                            str_idx = str_idx + 1
                        elif str[str_idx] == '"':
                            out.add(str[idx + 1 : str_idx])
                            idx = str_idx
                            item_recognized = True
                            break
                        str_idx = str_idx + 1
            idx = idx + 1
        if not item_recognized:
            line_unrecognized = True
    if line_unrecognized:
        _log.info("Unrecognized: %s" % str)

if __name__ == "__main__":
    configure_logging()

    cwd = os.path.abspath(os.curdir)
    filesystem = FileSystem()
    scm = SCMDetector(filesystem, Executive()).detect_scm_system(cwd)

    if scm is None:
        _log.error("WebKit checkout not found: You must run this script "
                   "from within a WebKit checkout.")
        sys.exit(1)

    checkout_root = scm.checkout_root
    _log.debug("WebKit checkout found with root: %s" % checkout_root)
    change_directory(filesystem, checkout_root=checkout_root, paths=None)

    strings_extractor = StringsExtractor([r"(WebInspector\.UIString\(.*)", r"\"((?:[^\"\\]|\\.)*?)\""])
    file_reader = TextFileReader(filesystem, strings_extractor)
    file_reader.process_paths([_inspector_directory])
    localized_strings_extractor = LocalizedStringsExtractor()
    localized_strings_extractor.process_file(_localized_strings)
    raw_ui_strings = frozenset(strings_extractor.strings[0])
    ui_strings = set()
    for s in raw_ui_strings:
        extract_ui_strings(s, ui_strings)
    strings = frozenset(strings_extractor.strings[1])
    localized_strings = frozenset(localized_strings_extractor.localized_strings)

    new_strings = ui_strings - localized_strings
    for s in new_strings:
        _log.info("New: \"%s\"" % (s))
    old_strings = localized_strings - ui_strings
    suspicious_strings = strings & old_strings
    for s in suspicious_strings:
        _log.info("Suspicious: \"%s\"" % (s))
    unused_strings = old_strings - strings
    for s in unused_strings:
        _log.info("Unused: \"%s\"" % (s))

    localized_strings_duplicates = {}
    for s in localized_strings_extractor.localized_strings:
        if s in localized_strings_duplicates:
            _log.info("Duplicate: \"%s\"" % (s))
        else:
            localized_strings_duplicates.setdefault(s)