514 lines
14 KiB
Go
514 lines
14 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ignore
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package main
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// This file generates data for the CLDR plural rules, as defined in
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// http://unicode.org/reports/tr35/tr35-numbers.html#Language_Plural_Rules
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//
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// We assume a slightly simplified grammar:
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//
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// condition = and_condition ('or' and_condition)* samples
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// and_condition = relation ('and' relation)*
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// relation = expr ('=' | '!=') range_list
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// expr = operand ('%' '10' '0'* )?
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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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// range = value'..'value
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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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//
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// samples = ('@integer' sampleList)?
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// ('@decimal' sampleList)?
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// sampleList = sampleRange (',' sampleRange)* (',' ('…'|'...'))?
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// sampleRange = decimalValue ('~' decimalValue)?
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// decimalValue = value ('.' value)?
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//
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// Symbol Value
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// n absolute value of the source number (integer and decimals).
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// i integer digits of n.
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// v number of visible fraction digits in n, with trailing zeros.
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// w number of visible fraction digits in n, without trailing zeros.
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// f visible fractional digits in n, with trailing zeros.
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// t visible fractional digits in n, without trailing zeros.
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//
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// The algorithm for which the data is generated is based on the following
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// observations
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//
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// - the number of different sets of numbers which the plural rules use to
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// test inclusion is limited,
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// - most numbers that are tested on are < 100
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//
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// This allows us to define a bitmap for each number < 100 where a bit i
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// indicates whether this number is included in some defined set i.
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// The function matchPlural in plural.go defines how we can subsequently use
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// this data to determine inclusion.
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//
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// There are a few languages for which this doesn't work. For one Italian and
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// Azerbaijan, which both test against numbers > 100 for ordinals and Breton,
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// which considers whether numbers are multiples of hundreds. The model here
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// could be extended to handle Italian and Azerbaijan fairly easily (by
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// considering the numbers 100, 200, 300, ..., 800, 900 in addition to the first
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// 100), but for now it seems easier to just hard-code these cases.
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import (
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"bufio"
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"bytes"
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"flag"
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"fmt"
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"log"
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"strconv"
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"strings"
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"golang.org/x/text/internal"
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"golang.org/x/text/internal/gen"
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"golang.org/x/text/language"
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"golang.org/x/text/unicode/cldr"
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)
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var (
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test = flag.Bool("test", false,
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"test existing tables; can be used to compare web data with package data.")
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outputFile = flag.String("output", "tables.go", "output file")
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outputTestFile = flag.String("testoutput", "data_test.go", "output file")
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draft = flag.String("draft",
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"contributed",
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`Minimal draft requirements (approved, contributed, provisional, unconfirmed).`)
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)
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func main() {
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gen.Init()
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const pkg = "plural"
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gen.Repackage("gen_common.go", "common.go", pkg)
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// Read the CLDR zip file.
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r := gen.OpenCLDRCoreZip()
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defer r.Close()
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d := &cldr.Decoder{}
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d.SetDirFilter("supplemental", "main")
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d.SetSectionFilter("numbers", "plurals")
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data, err := d.DecodeZip(r)
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if err != nil {
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log.Fatalf("DecodeZip: %v", err)
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}
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w := gen.NewCodeWriter()
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defer w.WriteGoFile(*outputFile, pkg)
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gen.WriteCLDRVersion(w)
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genPlurals(w, data)
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w = gen.NewCodeWriter()
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defer w.WriteGoFile(*outputTestFile, pkg)
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genPluralsTests(w, data)
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}
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type pluralTest struct {
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locales string // space-separated list of locales for this test
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form int // Use int instead of Form to simplify generation.
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integer []string // Entries of the form \d+ or \d+~\d+
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decimal []string // Entries of the form \f+ or \f+ +~\f+, where f is \d+\.\d+
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}
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func genPluralsTests(w *gen.CodeWriter, data *cldr.CLDR) {
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w.WriteType(pluralTest{})
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for _, plurals := range data.Supplemental().Plurals {
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if plurals.Type == "" {
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// The empty type is reserved for plural ranges.
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continue
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}
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tests := []pluralTest{}
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for _, pRules := range plurals.PluralRules {
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for _, rule := range pRules.PluralRule {
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test := pluralTest{
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locales: pRules.Locales,
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form: int(countMap[rule.Count]),
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}
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scan := bufio.NewScanner(strings.NewReader(rule.Data()))
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scan.Split(splitTokens)
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var p *[]string
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for scan.Scan() {
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switch t := scan.Text(); t {
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case "@integer":
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p = &test.integer
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case "@decimal":
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p = &test.decimal
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case ",", "…":
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default:
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if p != nil {
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*p = append(*p, t)
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}
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}
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}
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tests = append(tests, test)
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}
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}
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w.WriteVar(plurals.Type+"Tests", tests)
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}
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}
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func genPlurals(w *gen.CodeWriter, data *cldr.CLDR) {
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for _, plurals := range data.Supplemental().Plurals {
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if plurals.Type == "" {
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continue
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}
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// Initialize setMap and inclusionMasks. They are already populated with
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// a few entries to serve as an example and to assign nice numbers to
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// common cases.
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// setMap contains sets of numbers represented by boolean arrays where
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// a true value for element i means that the number i is included.
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setMap := map[[numN]bool]int{
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// The above init func adds an entry for including all numbers.
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[numN]bool{1: true}: 1, // fix {1} to a nice value
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[numN]bool{2: true}: 2, // fix {2} to a nice value
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[numN]bool{0: true}: 3, // fix {0} to a nice value
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}
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// inclusionMasks contains bit masks for every number under numN to
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// indicate in which set the number is included. Bit 1 << x will be set
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// if it is included in set x.
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inclusionMasks := [numN]uint64{
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// Note: these entries are not complete: more bits will be set along the way.
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0: 1 << 3,
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1: 1 << 1,
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2: 1 << 2,
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}
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// Create set {0..99}. We will assign this set the identifier 0.
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var all [numN]bool
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for i := range all {
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// Mark number i as being included in the set (which has identifier 0).
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inclusionMasks[i] |= 1 << 0
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// Mark number i as included in the set.
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all[i] = true
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}
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// Register the identifier for the set.
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setMap[all] = 0
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rules := []pluralCheck{}
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index := []byte{0}
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langMap := map[int]byte{0: 0} // From compact language index to index
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for _, pRules := range plurals.PluralRules {
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// Parse the rules.
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var conds []orCondition
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for _, rule := range pRules.PluralRule {
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form := countMap[rule.Count]
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conds = parsePluralCondition(conds, rule.Data(), form)
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}
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// Encode the rules.
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for _, c := range conds {
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// If an or condition only has filters, we create an entry for
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// this filter and the set that contains all values.
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empty := true
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for _, b := range c.used {
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empty = empty && !b
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}
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if empty {
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rules = append(rules, pluralCheck{
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cat: byte(opMod<<opShift) | byte(c.form),
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setID: 0, // all values
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})
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continue
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}
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// We have some entries with values.
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for i, set := range c.set {
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if !c.used[i] {
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continue
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}
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index, ok := setMap[set]
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if !ok {
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index = len(setMap)
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setMap[set] = index
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for i := range inclusionMasks {
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if set[i] {
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inclusionMasks[i] |= 1 << uint64(index)
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}
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}
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}
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rules = append(rules, pluralCheck{
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cat: byte(i<<opShift | andNext),
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setID: byte(index),
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})
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}
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// Now set the last entry to the plural form the rule matches.
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rules[len(rules)-1].cat &^= formMask
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rules[len(rules)-1].cat |= byte(c.form)
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}
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// Point the relevant locales to the created entries.
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for _, loc := range strings.Split(pRules.Locales, " ") {
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if strings.TrimSpace(loc) == "" {
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continue
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}
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lang, ok := language.CompactIndex(language.MustParse(loc))
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if !ok {
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log.Printf("No compact index for locale %q", loc)
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}
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langMap[lang] = byte(len(index) - 1)
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}
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index = append(index, byte(len(rules)))
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}
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w.WriteVar(plurals.Type+"Rules", rules)
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w.WriteVar(plurals.Type+"Index", index)
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// Expand the values.
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langToIndex := make([]byte, language.NumCompactTags)
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for i := range langToIndex {
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for p := i; ; p = int(internal.Parent[p]) {
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if x, ok := langMap[p]; ok {
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langToIndex[i] = x
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break
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}
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}
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}
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w.WriteVar(plurals.Type+"LangToIndex", langToIndex)
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// Need to convert array to slice because of golang.org/issue/7651.
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// This will allow tables to be dropped when unused. This is especially
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// relevant for the ordinal data, which I suspect won't be used as much.
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w.WriteVar(plurals.Type+"InclusionMasks", inclusionMasks[:])
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if len(rules) > 0xFF {
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log.Fatalf("Too many entries for rules: %#x", len(rules))
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}
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if len(index) > 0xFF {
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log.Fatalf("Too many entries for index: %#x", len(index))
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}
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if len(setMap) > 64 { // maximum number of bits.
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log.Fatalf("Too many entries for setMap: %d", len(setMap))
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}
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w.WriteComment(
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"Slots used for %s: %X of 0xFF rules; %X of 0xFF indexes; %d of 64 sets",
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plurals.Type, len(rules), len(index), len(setMap))
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// Prevent comment from attaching to the next entry.
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fmt.Fprint(w, "\n\n")
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}
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}
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type orCondition struct {
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original string // for debugging
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form Form
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used [32]bool
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set [32][numN]bool
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}
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func (o *orCondition) add(op opID, mod int, v []int) (ok bool) {
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ok = true
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for _, x := range v {
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if x >= maxMod {
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ok = false
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break
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}
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}
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for i := 0; i < numN; i++ {
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m := i
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if mod != 0 {
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m = i % mod
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}
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if !intIn(m, v) {
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o.set[op][i] = false
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}
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}
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if ok {
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o.used[op] = true
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}
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return ok
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}
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func intIn(x int, a []int) bool {
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for _, y := range a {
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if x == y {
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return true
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}
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}
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return false
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}
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var operandIndex = map[string]opID{
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"i": opI,
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"n": opN,
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"f": opF,
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"v": opV,
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"w": opW,
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}
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// parsePluralCondition parses the condition of a single pluralRule and appends
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// the resulting or conditions to conds.
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//
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// Example rules:
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// // Category "one" in English: only allow 1 with no visible fraction
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// i = 1 and v = 0 @integer 1
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//
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// // Category "few" in Czech: all numbers with visible fractions
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// v != 0 @decimal ...
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//
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// // Category "zero" in Latvian: all multiples of 10 or the numbers 11-19 or
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// // numbers with a fraction 11..19 and no trailing zeros.
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// n % 10 = 0 or n % 100 = 11..19 or v = 2 and f % 100 = 11..19 @integer ...
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//
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// @integer and @decimal are followed by examples and are not relevant for the
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// rule itself. The are used here to signal the termination of the rule.
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func parsePluralCondition(conds []orCondition, s string, f Form) []orCondition {
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scan := bufio.NewScanner(strings.NewReader(s))
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scan.Split(splitTokens)
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for {
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cond := orCondition{original: s, form: f}
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// Set all numbers to be allowed for all number classes and restrict
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// from here on.
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for i := range cond.set {
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for j := range cond.set[i] {
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cond.set[i][j] = true
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}
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}
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andLoop:
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for {
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var token string
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scan.Scan() // Must exist.
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switch class := scan.Text(); class {
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case "t":
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class = "w" // equal to w for t == 0
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fallthrough
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case "n", "i", "f", "v", "w":
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op := scanToken(scan)
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opCode := operandIndex[class]
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mod := 0
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if op == "%" {
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opCode |= opMod
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switch v := scanUint(scan); v {
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case 10, 100:
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mod = v
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case 1000:
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// A more general solution would be to allow checking
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// against multiples of 100 and include entries for the
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// numbers 100..900 in the inclusion masks. At the
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// moment this would only help Azerbaijan and Italian.
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// Italian doesn't use '%', so this must be Azerbaijan.
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cond.used[opAzerbaijan00s] = true
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return append(conds, cond)
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case 1000000:
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cond.used[opBretonM] = true
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return append(conds, cond)
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default:
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log.Fatalf("Modulo value not supported %d", v)
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}
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op = scanToken(scan)
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}
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if op != "=" && op != "!=" {
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log.Fatalf("Unexpected op %q", op)
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}
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if op == "!=" {
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opCode |= opNotEqual
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}
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a := []int{}
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v := scanUint(scan)
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if class == "w" && v != 0 {
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log.Fatalf("Must compare against zero for operand type %q", class)
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}
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token = scanToken(scan)
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for {
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switch token {
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case "..":
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end := scanUint(scan)
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for ; v <= end; v++ {
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a = append(a, v)
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}
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token = scanToken(scan)
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default: // ",", "or", "and", "@..."
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a = append(a, v)
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}
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if token != "," {
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break
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}
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v = scanUint(scan)
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token = scanToken(scan)
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}
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if !cond.add(opCode, mod, a) {
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// Detected large numbers. As we ruled out Azerbaijan, this
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// must be the many rule for Italian ordinals.
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cond.set[opItalian800] = cond.set[opN]
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cond.used[opItalian800] = true
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}
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case "@integer", "@decimal": // "other" entry: tests only.
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return conds
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default:
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log.Fatalf("Unexpected operand class %q (%s)", class, s)
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}
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switch token {
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case "or":
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conds = append(conds, cond)
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break andLoop
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case "@integer", "@decimal": // examples
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// There is always an example in practice, so we always terminate here.
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if err := scan.Err(); err != nil {
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log.Fatal(err)
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}
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return append(conds, cond)
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case "and":
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// keep accumulating
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default:
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log.Fatalf("Unexpected token %q", token)
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}
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}
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}
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}
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func scanToken(scan *bufio.Scanner) string {
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scan.Scan()
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return scan.Text()
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}
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func scanUint(scan *bufio.Scanner) int {
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scan.Scan()
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val, err := strconv.ParseUint(scan.Text(), 10, 32)
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if err != nil {
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log.Fatal(err)
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}
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return int(val)
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}
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// splitTokens can be used with bufio.Scanner to tokenize CLDR plural rules.
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func splitTokens(data []byte, atEOF bool) (advance int, token []byte, err error) {
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condTokens := [][]byte{
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[]byte(".."),
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[]byte(","),
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[]byte("!="),
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[]byte("="),
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}
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advance, token, err = bufio.ScanWords(data, atEOF)
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for _, t := range condTokens {
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if len(t) >= len(token) {
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continue
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}
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switch p := bytes.Index(token, t); {
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case p == -1:
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case p == 0:
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advance = len(t)
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token = token[:len(t)]
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return advance - len(token) + len(t), token[:len(t)], err
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case p < advance:
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// Don't split when "=" overlaps "!=".
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if t[0] == '=' && token[p-1] == '!' {
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continue
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}
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advance = p
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token = token[:p]
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}
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}
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return advance, token, err
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}
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