| # Copyright (c) 2012 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. |
| |
| '''Pseudo RTL, (aka Fake Bidi) support. It simply wraps each word with |
| Unicode RTL overrides. |
| More info at https://sites.google.com/a/chromium.org/dev/Home/fake-bidi |
| ''' |
| |
| import re |
| |
| from grit import lazy_re |
| from grit import tclib |
| |
| ACCENTED_STRINGS = { |
| 'a': u"\u00e5", 'e': u"\u00e9", 'i': u"\u00ee", 'o': u"\u00f6", |
| 'u': u"\u00fb", 'A': u"\u00c5", 'E': u"\u00c9", 'I': u"\u00ce", |
| 'O': u"\u00d6", 'U': u"\u00db", 'c': u"\u00e7", 'd': u"\u00f0", |
| 'n': u"\u00f1", 'p': u"\u00fe", 'y': u"\u00fd", 'C': u"\u00c7", |
| 'D': u"\u00d0", 'N': u"\u00d1", 'P': u"\u00de", 'Y': u"\u00dd", |
| 'f': u"\u0192", 's': u"\u0161", 'S': u"\u0160", 'z': u"\u017e", |
| 'Z': u"\u017d", 'g': u"\u011d", 'G': u"\u011c", 'h': u"\u0125", |
| 'H': u"\u0124", 'j': u"\u0135", 'J': u"\u0134", 'k': u"\u0137", |
| 'K': u"\u0136", 'l': u"\u013c", 'L': u"\u013b", 't': u"\u0163", |
| 'T': u"\u0162", 'w': u"\u0175", 'W': u"\u0174", |
| '$': u"\u20ac", '?': u"\u00bf", 'R': u"\u00ae", r'!': u"\u00a1", |
| } |
| |
| # a character set containing the keys in ACCENTED_STRINGS |
| # We should not accent characters in an escape sequence such as "\n". |
| # To be safe, we assume every character following a backslash is an escaped |
| # character. We also need to consider the case like "\\n", which means |
| # a blackslash and a character "n", we will accent the character "n". |
| TO_ACCENT = lazy_re.compile( |
| r'[%s]|\\[a-z\\]' % ''.join(ACCENTED_STRINGS.keys())) |
| |
| # Lex text so that we don't interfere with html tokens and entities. |
| # This lexing scheme will handle all well formed tags and entities, html or |
| # xhtml. It will not handle comments, CDATA sections, or the unescaping tags: |
| # script, style, xmp or listing. If any of those appear in messages, |
| # something is wrong. |
| TOKENS = [ lazy_re.compile( |
| '^%s' % pattern, # match at the beginning of input |
| re.I | re.S # html tokens are case-insensitive |
| ) |
| for pattern in |
| ( |
| # a run of non html special characters |
| r'[^<&]+', |
| # a tag |
| (r'</?[a-z]\w*' # beginning of tag |
| r'(?:\s+\w+(?:\s*=\s*' # attribute start |
| r'(?:[^\s"\'>]+|"[^\"]*"|\'[^\']*\'))?' # attribute value |
| r')*\s*/?>'), |
| # an entity |
| r'&(?:[a-z]\w+|#\d+|#x[\da-f]+);', |
| # an html special character not part of a special sequence |
| r'.' |
| ) ] |
| |
| ALPHABETIC_RUN = lazy_re.compile(r'([^\W0-9_]+)') |
| |
| RLO = u'\u202e' |
| PDF = u'\u202c' |
| |
| def PseudoRTLString(text): |
| '''Returns a fake bidirectional version of the source string. This code is |
| based on accentString above, in turn copied from Frank Tang. |
| ''' |
| parts = [] |
| while text: |
| m = None |
| for token in TOKENS: |
| m = token.search(text) |
| if m: |
| part = m.group(0) |
| text = text[len(part):] |
| if part[0] not in ('<', '&'): |
| # not a tag or entity, so accent |
| part = ALPHABETIC_RUN.sub(lambda run: RLO + run.group() + PDF, part) |
| parts.append(part) |
| break |
| return ''.join(parts) |
| |
| |
| def PseudoRTLMessage(message): |
| '''Returns a pseudo-RTL (aka Fake-Bidi) translation of the provided message. |
| |
| Args: |
| message: tclib.Message() |
| |
| Return: |
| tclib.Translation() |
| ''' |
| transl = tclib.Translation() |
| for part in message.GetContent(): |
| if isinstance(part, tclib.Placeholder): |
| transl.AppendPlaceholder(part) |
| else: |
| transl.AppendText(PseudoRTLString(part)) |
| |
| return transl |