104 lines
2.8 KiB
Python
104 lines
2.8 KiB
Python
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"""Server functions for loading translations
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"""
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from collections import defaultdict
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import errno
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import io
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import json
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from os.path import dirname, join as pjoin
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import re
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I18N_DIR = dirname(__file__)
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# Cache structure:
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# {'nbjs': { # Domain
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# 'zh-CN': { # Language code
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# <english string>: <translated string>
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# ...
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# }
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# }}
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TRANSLATIONS_CACHE = {'nbjs': {}}
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_accept_lang_re = re.compile(r'''
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(?P<lang>[a-zA-Z]{1,8}(-[a-zA-Z]{1,8})?)
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(\s*;\s*q\s*=\s*
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(?P<qvalue>[01](.\d+)?)
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)?''', re.VERBOSE)
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def parse_accept_lang_header(accept_lang):
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"""Parses the 'Accept-Language' HTTP header.
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Returns a list of language codes in *ascending* order of preference
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(with the most preferred language last).
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"""
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by_q = defaultdict(list)
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for part in accept_lang.split(','):
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m = _accept_lang_re.match(part.strip())
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if not m:
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continue
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lang, qvalue = m.group('lang', 'qvalue')
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# Browser header format is zh-CN, gettext uses zh_CN
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lang = lang.replace('-', '_')
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if qvalue is None:
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qvalue = 1.
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else:
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qvalue = float(qvalue)
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if qvalue == 0:
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continue # 0 means not accepted
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by_q[qvalue].append(lang)
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if '_' in lang:
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short = lang.split('_')[0]
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if short != 'en':
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by_q[qvalue].append(short)
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res = []
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for qvalue, langs in sorted(by_q.items()):
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res.extend(sorted(langs))
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return res
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def load(language, domain='nbjs'):
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"""Load translations from an nbjs.json file"""
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try:
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f = io.open(pjoin(I18N_DIR, language, 'LC_MESSAGES', 'nbjs.json'),
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encoding='utf-8')
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except IOError as e:
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if e.errno != errno.ENOENT:
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raise
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return {}
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with f:
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data = json.load(f)
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return data["locale_data"][domain]
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def cached_load(language, domain='nbjs'):
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"""Load translations for one language, using in-memory cache if available"""
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domain_cache = TRANSLATIONS_CACHE[domain]
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try:
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return domain_cache[language]
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except KeyError:
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data = load(language, domain)
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domain_cache[language] = data
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return data
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def combine_translations(accept_language, domain='nbjs'):
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"""Combine translations for multiple accepted languages.
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Returns data re-packaged in jed1.x format.
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"""
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lang_codes = parse_accept_lang_header(accept_language)
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combined = {}
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for language in lang_codes:
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if language == 'en':
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# en is default, all translations are in frontend.
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combined.clear()
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else:
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combined.update(cached_load(language, domain))
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combined[''] = {"domain":"nbjs"}
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return {
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"domain": domain,
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"locale_data": {
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domain: combined
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}
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}
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