The Tor Browser: comparison addon-sdk/source/python-lib/plural-rules-generator.py

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+:03e39d8ad038
+# 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/.
+# Program used to generate /packages/api-utils/lib/l10n/plural-rules.js
+# Fetch unicode.org data in order to build functions specific to each language
+# that will return for a given integer, its plural form name.
+# Plural form names are: zero, one, two, few, many, other.
+#
+# More information here:
+#   http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/language_plural_rules.html
+#   http://cldr.unicode.org/index/cldr-spec/plural-rules
+# Usage:
+# $ python plural-rules-generator.py > ../packages/api-utils/lib/l10n/plural-rules.js
+import urllib2
+import xml.dom.minidom
+import json
+import re
+PRINT_CONDITIONS_IN_COMMENTS = False
+UNICODE_ORG_XML_URL = "http://unicode.org/repos/cldr/trunk/common/supplemental/plurals.xml"
+CONDITION_RE = r'n( mod \d+)? (is|in|within|(not in))( not)? ([^\s]+)'
+# For a given regexp.MatchObject `g` for `CONDITION_RE`,
+# returns the equivalent JS piece of code
+# i.e. maps pseudo conditional language from unicode.org XML to JS code
+def parseCondition(g):
+lvalue = "n"
+if g.group(1):
+lvalue = "(n %% %d)" % int(g.group(1).replace("mod ", ""))
+operator = g.group(2)
+if g.group(4):
+operator += " not"
+rvalue = g.group(5)
+if operator == "is":
+return "%s == %s" % (lvalue, rvalue)
+if operator == "is not":
+return "%s != %s" % (lvalue, rvalue)
+# "in", "within" or "not in" case:
+notPrefix = ""
+if operator == "not in":
+notPrefix = "!"
+# `rvalue` is a comma seperated list of either:
+#  - numbers: 42
+#  - ranges: 42..72
+sections = rvalue.split(',')
+if ".." not in rvalue:
+# If we don't have range, but only a list of integer,
+# we can simplify the generated code by using `isIn`
+# n in 1,3,6,42
+return "%sisIn(%s, [%s])" % (notPrefix, lvalue, ", ".join(sections))
+# n in 1..42
+# n in 1..3,42
+subCondition = []
+integers = []
+for sub in sections:
+if ".." in sub:
+left, right = sub.split("..")
+subCondition.append("isBetween(%s, %d, %d)" % (
+lvalue,
+int(left),
+int(right)
+))
+else:
+integers.append(int(sub))
+if len(integers) > 1:
+subCondition.append("isIn(%s, [%s])" % (lvalue, ", ".join(integers)))
+elif len(integers) == 1:
+subCondition.append("(%s == %s)" % (lvalue, integers[0]))
+return "%s(%s)" % (notPrefix, " || ".join(subCondition))
+def computeRules():
+# Fetch plural rules data directly from unicode.org website:
+url = UNICODE_ORG_XML_URL
+f = urllib2.urlopen(url)
+doc = xml.dom.minidom.parse(f)
+# Read XML document and extract locale to rules mapping
+localesMapping = {}
+algorithms = {}
+for index,pluralRules in enumerate(doc.getElementsByTagName("pluralRules")):
+if not index in algorithms:
+algorithms[index] = {}
+for locale in pluralRules.getAttribute("locales").split():
+localesMapping[locale] = index
+for rule in pluralRules.childNodes:
+if rule.nodeType != rule.ELEMENT_NODE or rule.tagName != "pluralRule":
+continue
+pluralForm = rule.getAttribute("count")
+algorithm = rule.firstChild.nodeValue
+algorithms[index][pluralForm] = algorithm
+# Go through all rules and compute a Javascript code for each of them
+rules = {}
+for index,rule in algorithms.iteritems():
+lines = []
+for pluralForm in rule:
+condition = rule[pluralForm]
+originalCondition = str(condition)
+# Convert pseudo language to JS code
+condition = rule[pluralForm].lower()
+condition = re.sub(CONDITION_RE, parseCondition, condition)
+condition = re.sub(r'or', "||", condition)
+condition = re.sub(r'and', "&&", condition)
+# Prints original condition in unicode.org pseudo language
+if PRINT_CONDITIONS_IN_COMMENTS:
+lines.append( '// %s' % originalCondition )
+lines.append( 'if (%s)' % condition )
+lines.append( '  return "%s";' % pluralForm )
+rules[index] = "\n    ".join(lines)
+return localesMapping, rules
+localesMapping, rules = computeRules()
+rulesLines = []
+for index in rules:
+lines = rules[index]
+rulesLines.append('"%d": function (n) {' % index)
+rulesLines.append('  %s' % lines)
+rulesLines.append('  return "other"')
+rulesLines.append('},')
+print """/* 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 automatically generated with /python-lib/plural-rules-generator.py
+// Fetching data from: %s
+// Mapping of short locale name == to == > rule index in following list
+const LOCALES_TO_RULES = %s;
+// Utility functions for plural rules methods
+function isIn(n, list) list.indexOf(n) !== -1;
+function isBetween(n, start, end) start <= n && n <= end;
+// List of all plural rules methods, that maps an integer to the plural form name to use
+const RULES = {
+%s
+};
+/**
+* Return a function that gives the plural form name for a given integer
+* for the specified `locale`
+*   let fun = getRulesForLocale('en');
+*   fun(1)    -> 'one'
+*   fun(0)    -> 'other'
+*   fun(1000) -> 'other'
+*/
+exports.getRulesForLocale = function getRulesForLocale(locale) {
+let index = LOCALES_TO_RULES[locale];
+if (!(index in RULES)) {
+console.warn('Plural form unknown for locale "' + locale + '"');
+return function () { return "other"; };
+}
+return RULES[index];
+}
+""" % (UNICODE_ORG_XML_URL,
+json.dumps(localesMapping, sort_keys=True, indent=2),
+"\n  ".join(rulesLines))

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comparison: addon-sdk/source/python-lib/plural-rules-generator.py

addon-sdk/source/python-lib/plural-rules-generator.py