text/unicode/bidi/gen_ranges.go

// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build ignore

package main

import (
	"unicode"

	"golang.org/x/text/internal/gen"
	"golang.org/x/text/internal/ucd"
	"golang.org/x/text/unicode/rangetable"
)

// These tables are hand-extracted from:
// https://www.unicode.org/Public/8.0.0/ucd/extracted/DerivedBidiClass.txt
func visitDefaults(fn func(r rune, c Class)) {
	// first write default values for ranges listed above.
	visitRunes(fn, AL, []rune{
		0x0600, 0x07BF, // Arabic
		0x08A0, 0x08FF, // Arabic Extended-A
		0xFB50, 0xFDCF, // Arabic Presentation Forms
		0xFDF0, 0xFDFF,
		0xFE70, 0xFEFF,
		0x0001EE00, 0x0001EEFF, // Arabic Mathematical Alpha Symbols
	})
	visitRunes(fn, R, []rune{
		0x0590, 0x05FF, // Hebrew
		0x07C0, 0x089F, // Nko et al.
		0xFB1D, 0xFB4F,
		0x00010800, 0x00010FFF, // Cypriot Syllabary et. al.
		0x0001E800, 0x0001EDFF,
		0x0001EF00, 0x0001EFFF,
	})
	visitRunes(fn, ET, []rune{ // European Terminator
		0x20A0, 0x20Cf, // Currency symbols
	})
	rangetable.Visit(unicode.Noncharacter_Code_Point, func(r rune) {
		fn(r, BN) // Boundary Neutral
	})
	ucd.Parse(gen.OpenUCDFile("DerivedCoreProperties.txt"), func(p *ucd.Parser) {
		if p.String(1) == "Default_Ignorable_Code_Point" {
			fn(p.Rune(0), BN) // Boundary Neutral
		}
	})
}

func visitRunes(fn func(r rune, c Class), c Class, runes []rune) {
	for i := 0; i < len(runes); i += 2 {
		lo, hi := runes[i], runes[i+1]
		for j := lo; j <= hi; j++ {
			fn(j, c)
		}
	}
}