mirror of
https://github.com/hyperion-project/hyperion.ng.git
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608 lines
12 KiB
JavaScript
608 lines
12 KiB
JavaScript
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/**
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* cldrpluralparser.js
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* A parser engine for CLDR plural rules.
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*
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* Copyright 2012-2014 Santhosh Thottingal and other contributors
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* Released under the MIT license
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* http://opensource.org/licenses/MIT
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*
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* @source https://github.com/santhoshtr/CLDRPluralRuleParser
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* @author Santhosh Thottingal <santhosh.thottingal@gmail.com>
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* @author Timo Tijhof
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* @author Amir Aharoni
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*/
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/**
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* Evaluates a plural rule in CLDR syntax for a number
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* @param {string} rule
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* @param {integer} number
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* @return {boolean} true if evaluation passed, false if evaluation failed.
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*/
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// UMD returnExports https://github.com/umdjs/umd/blob/master/returnExports.js
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(function(root, factory) {
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if (typeof define === 'function' && define.amd) {
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// AMD. Register as an anonymous module.
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define(factory);
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} else if (typeof exports === 'object') {
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// Node. Does not work with strict CommonJS, but
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// only CommonJS-like environments that support module.exports,
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// like Node.
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module.exports = factory();
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} else {
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// Browser globals (root is window)
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root.pluralRuleParser = factory();
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}
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}(this, function() {
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function pluralRuleParser(rule, number) {
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'use strict';
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/*
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Syntax: see http://unicode.org/reports/tr35/#Language_Plural_Rules
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-----------------------------------------------------------------
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condition = and_condition ('or' and_condition)*
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('@integer' samples)?
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('@decimal' samples)?
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and_condition = relation ('and' relation)*
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relation = is_relation | in_relation | within_relation
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is_relation = expr 'is' ('not')? value
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in_relation = expr (('not')? 'in' | '=' | '!=') range_list
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within_relation = expr ('not')? 'within' range_list
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expr = operand (('mod' | '%') value)?
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operand = 'n' | 'i' | 'f' | 't' | 'v' | 'w'
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range_list = (range | value) (',' range_list)*
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value = digit+
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digit = 0|1|2|3|4|5|6|7|8|9
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range = value'..'value
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samples = sampleRange (',' sampleRange)* (',' ('…'|'...'))?
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sampleRange = decimalValue '~' decimalValue
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decimalValue = value ('.' value)?
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*/
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// We don't evaluate the samples section of the rule. Ignore it.
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rule = rule.split('@')[0].replace(/^\s*/, '').replace(/\s*$/, '');
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if (!rule.length) {
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// Empty rule or 'other' rule.
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return true;
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}
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// Indicates the current position in the rule as we parse through it.
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// Shared among all parsing functions below.
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var pos = 0,
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operand,
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expression,
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relation,
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result,
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whitespace = makeRegexParser(/^\s+/),
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value = makeRegexParser(/^\d+/),
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_n_ = makeStringParser('n'),
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_i_ = makeStringParser('i'),
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_f_ = makeStringParser('f'),
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_t_ = makeStringParser('t'),
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_v_ = makeStringParser('v'),
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_w_ = makeStringParser('w'),
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_is_ = makeStringParser('is'),
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_isnot_ = makeStringParser('is not'),
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_isnot_sign_ = makeStringParser('!='),
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_equal_ = makeStringParser('='),
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_mod_ = makeStringParser('mod'),
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_percent_ = makeStringParser('%'),
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_not_ = makeStringParser('not'),
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_in_ = makeStringParser('in'),
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_within_ = makeStringParser('within'),
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_range_ = makeStringParser('..'),
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_comma_ = makeStringParser(','),
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_or_ = makeStringParser('or'),
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_and_ = makeStringParser('and');
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function debug() {
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// console.log.apply(console, arguments);
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}
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debug('pluralRuleParser', rule, number);
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// Try parsers until one works, if none work return null
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function choice(parserSyntax) {
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return function() {
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var i, result;
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for (i = 0; i < parserSyntax.length; i++) {
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result = parserSyntax[i]();
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if (result !== null) {
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return result;
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}
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}
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return null;
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};
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}
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// Try several parserSyntax-es in a row.
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// All must succeed; otherwise, return null.
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// This is the only eager one.
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function sequence(parserSyntax) {
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var i, parserRes,
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originalPos = pos,
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result = [];
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for (i = 0; i < parserSyntax.length; i++) {
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parserRes = parserSyntax[i]();
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if (parserRes === null) {
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pos = originalPos;
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return null;
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}
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result.push(parserRes);
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}
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return result;
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}
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// Run the same parser over and over until it fails.
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// Must succeed a minimum of n times; otherwise, return null.
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function nOrMore(n, p) {
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return function() {
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var originalPos = pos,
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result = [],
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parsed = p();
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while (parsed !== null) {
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result.push(parsed);
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parsed = p();
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}
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if (result.length < n) {
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pos = originalPos;
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return null;
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}
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return result;
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};
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}
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// Helpers - just make parserSyntax out of simpler JS builtin types
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function makeStringParser(s) {
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var len = s.length;
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return function() {
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var result = null;
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if (rule.substr(pos, len) === s) {
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result = s;
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pos += len;
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}
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return result;
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};
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}
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function makeRegexParser(regex) {
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return function() {
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var matches = rule.substr(pos).match(regex);
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if (matches === null) {
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return null;
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}
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pos += matches[0].length;
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return matches[0];
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};
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}
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/**
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* Integer digits of n.
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*/
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function i() {
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var result = _i_();
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if (result === null) {
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debug(' -- failed i', parseInt(number, 10));
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return result;
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}
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result = parseInt(number, 10);
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debug(' -- passed i ', result);
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return result;
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}
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/**
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* Absolute value of the source number (integer and decimals).
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*/
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function n() {
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var result = _n_();
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if (result === null) {
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debug(' -- failed n ', number);
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return result;
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}
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result = parseFloat(number, 10);
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debug(' -- passed n ', result);
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return result;
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}
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/**
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* Visible fractional digits in n, with trailing zeros.
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*/
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function f() {
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var result = _f_();
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if (result === null) {
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debug(' -- failed f ', number);
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return result;
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}
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result = (number + '.').split('.')[1] || 0;
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debug(' -- passed f ', result);
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return result;
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}
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/**
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* Visible fractional digits in n, without trailing zeros.
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*/
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function t() {
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var result = _t_();
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if (result === null) {
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debug(' -- failed t ', number);
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return result;
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}
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result = (number + '.').split('.')[1].replace(/0$/, '') || 0;
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debug(' -- passed t ', result);
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return result;
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}
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/**
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* Number of visible fraction digits in n, with trailing zeros.
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*/
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function v() {
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var result = _v_();
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if (result === null) {
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debug(' -- failed v ', number);
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return result;
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}
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result = (number + '.').split('.')[1].length || 0;
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debug(' -- passed v ', result);
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return result;
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}
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/**
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* Number of visible fraction digits in n, without trailing zeros.
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*/
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function w() {
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var result = _w_();
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if (result === null) {
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debug(' -- failed w ', number);
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return result;
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}
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result = (number + '.').split('.')[1].replace(/0$/, '').length || 0;
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debug(' -- passed w ', result);
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return result;
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}
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// operand = 'n' | 'i' | 'f' | 't' | 'v' | 'w'
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operand = choice([n, i, f, t, v, w]);
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// expr = operand (('mod' | '%') value)?
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expression = choice([mod, operand]);
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function mod() {
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var result = sequence(
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[operand, whitespace, choice([_mod_, _percent_]), whitespace, value]
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);
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if (result === null) {
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debug(' -- failed mod');
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return null;
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}
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debug(' -- passed ' + parseInt(result[0], 10) + ' ' + result[2] + ' ' + parseInt(result[4], 10));
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return parseFloat(result[0]) % parseInt(result[4], 10);
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}
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function not() {
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var result = sequence([whitespace, _not_]);
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if (result === null) {
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debug(' -- failed not');
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return null;
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}
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return result[1];
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}
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// is_relation = expr 'is' ('not')? value
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function is() {
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var result = sequence([expression, whitespace, choice([_is_]), whitespace, value]);
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if (result !== null) {
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debug(' -- passed is : ' + result[0] + ' == ' + parseInt(result[4], 10));
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return result[0] === parseInt(result[4], 10);
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}
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debug(' -- failed is');
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return null;
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}
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// is_relation = expr 'is' ('not')? value
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function isnot() {
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var result = sequence(
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[expression, whitespace, choice([_isnot_, _isnot_sign_]), whitespace, value]
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);
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if (result !== null) {
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debug(' -- passed isnot: ' + result[0] + ' != ' + parseInt(result[4], 10));
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return result[0] !== parseInt(result[4], 10);
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}
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debug(' -- failed isnot');
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return null;
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}
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function not_in() {
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var i, range_list,
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result = sequence([expression, whitespace, _isnot_sign_, whitespace, rangeList]);
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if (result !== null) {
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debug(' -- passed not_in: ' + result[0] + ' != ' + result[4]);
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range_list = result[4];
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for (i = 0; i < range_list.length; i++) {
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if (parseInt(range_list[i], 10) === parseInt(result[0], 10)) {
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return false;
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}
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}
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return true;
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}
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debug(' -- failed not_in');
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return null;
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}
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// range_list = (range | value) (',' range_list)*
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function rangeList() {
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var result = sequence([choice([range, value]), nOrMore(0, rangeTail)]),
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resultList = [];
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if (result !== null) {
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resultList = resultList.concat(result[0]);
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if (result[1][0]) {
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resultList = resultList.concat(result[1][0]);
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}
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return resultList;
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}
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debug(' -- failed rangeList');
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return null;
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}
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function rangeTail() {
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// ',' range_list
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var result = sequence([_comma_, rangeList]);
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if (result !== null) {
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return result[1];
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}
|
||
|
|
|
||
|
|
debug(' -- failed rangeTail');
|
||
|
|
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
// range = value'..'value
|
||
|
|
function range() {
|
||
|
|
var i, array, left, right,
|
||
|
|
result = sequence([value, _range_, value]);
|
||
|
|
|
||
|
|
if (result !== null) {
|
||
|
|
debug(' -- passed range');
|
||
|
|
|
||
|
|
array = [];
|
||
|
|
left = parseInt(result[0], 10);
|
||
|
|
right = parseInt(result[2], 10);
|
||
|
|
|
||
|
|
for (i = left; i <= right; i++) {
|
||
|
|
array.push(i);
|
||
|
|
}
|
||
|
|
|
||
|
|
return array;
|
||
|
|
}
|
||
|
|
|
||
|
|
debug(' -- failed range');
|
||
|
|
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
function _in() {
|
||
|
|
var result, range_list, i;
|
||
|
|
|
||
|
|
// in_relation = expr ('not')? 'in' range_list
|
||
|
|
result = sequence(
|
||
|
|
[expression, nOrMore(0, not), whitespace, choice([_in_, _equal_]), whitespace, rangeList]
|
||
|
|
);
|
||
|
|
|
||
|
|
if (result !== null) {
|
||
|
|
debug(' -- passed _in:' + result);
|
||
|
|
|
||
|
|
range_list = result[5];
|
||
|
|
|
||
|
|
for (i = 0; i < range_list.length; i++) {
|
||
|
|
if (parseInt(range_list[i], 10) === parseFloat(result[0])) {
|
||
|
|
return (result[1][0] !== 'not');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return (result[1][0] === 'not');
|
||
|
|
}
|
||
|
|
|
||
|
|
debug(' -- failed _in ');
|
||
|
|
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* The difference between "in" and "within" is that
|
||
|
|
* "in" only includes integers in the specified range,
|
||
|
|
* while "within" includes all values.
|
||
|
|
*/
|
||
|
|
function within() {
|
||
|
|
var range_list, result;
|
||
|
|
|
||
|
|
// within_relation = expr ('not')? 'within' range_list
|
||
|
|
result = sequence(
|
||
|
|
[expression, nOrMore(0, not), whitespace, _within_, whitespace, rangeList]
|
||
|
|
);
|
||
|
|
|
||
|
|
if (result !== null) {
|
||
|
|
debug(' -- passed within');
|
||
|
|
|
||
|
|
range_list = result[5];
|
||
|
|
|
||
|
|
if ((result[0] >= parseInt(range_list[0], 10)) &&
|
||
|
|
(result[0] < parseInt(range_list[range_list.length - 1], 10))) {
|
||
|
|
|
||
|
|
return (result[1][0] !== 'not');
|
||
|
|
}
|
||
|
|
|
||
|
|
return (result[1][0] === 'not');
|
||
|
|
}
|
||
|
|
|
||
|
|
debug(' -- failed within ');
|
||
|
|
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
// relation = is_relation | in_relation | within_relation
|
||
|
|
relation = choice([is, not_in, isnot, _in, within]);
|
||
|
|
|
||
|
|
// and_condition = relation ('and' relation)*
|
||
|
|
function and() {
|
||
|
|
var i,
|
||
|
|
result = sequence([relation, nOrMore(0, andTail)]);
|
||
|
|
|
||
|
|
if (result) {
|
||
|
|
if (!result[0]) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
for (i = 0; i < result[1].length; i++) {
|
||
|
|
if (!result[1][i]) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
debug(' -- failed and');
|
||
|
|
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
// ('and' relation)*
|
||
|
|
function andTail() {
|
||
|
|
var result = sequence([whitespace, _and_, whitespace, relation]);
|
||
|
|
|
||
|
|
if (result !== null) {
|
||
|
|
debug(' -- passed andTail' + result);
|
||
|
|
|
||
|
|
return result[3];
|
||
|
|
}
|
||
|
|
|
||
|
|
debug(' -- failed andTail');
|
||
|
|
|
||
|
|
return null;
|
||
|
|
|
||
|
|
}
|
||
|
|
// ('or' and_condition)*
|
||
|
|
function orTail() {
|
||
|
|
var result = sequence([whitespace, _or_, whitespace, and]);
|
||
|
|
|
||
|
|
if (result !== null) {
|
||
|
|
debug(' -- passed orTail: ' + result[3]);
|
||
|
|
|
||
|
|
return result[3];
|
||
|
|
}
|
||
|
|
|
||
|
|
debug(' -- failed orTail');
|
||
|
|
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
// condition = and_condition ('or' and_condition)*
|
||
|
|
function condition() {
|
||
|
|
var i,
|
||
|
|
result = sequence([and, nOrMore(0, orTail)]);
|
||
|
|
|
||
|
|
if (result) {
|
||
|
|
for (i = 0; i < result[1].length; i++) {
|
||
|
|
if (result[1][i]) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return result[0];
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
result = condition();
|
||
|
|
|
||
|
|
/**
|
||
|
|
* For success, the pos must have gotten to the end of the rule
|
||
|
|
* and returned a non-null.
|
||
|
|
* n.b. This is part of language infrastructure,
|
||
|
|
* so we do not throw an internationalizable message.
|
||
|
|
*/
|
||
|
|
if (result === null) {
|
||
|
|
throw new Error('Parse error at position ' + pos.toString() + ' for rule: ' + rule);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (pos !== rule.length) {
|
||
|
|
debug('Warning: Rule not parsed completely. Parser stopped at ' + rule.substr(0, pos) + ' for rule: ' + rule);
|
||
|
|
}
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
return pluralRuleParser;
|
||
|
|
|
||
|
|
}));
|