mirror of
https://github.com/rclone/rclone.git
synced 2024-12-29 02:19:08 +01:00
625 lines
15 KiB
Go
625 lines
15 KiB
Go
// Package main provides utilities for encoder.
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package main
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import (
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"flag"
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"fmt"
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"log"
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"math/rand"
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"os"
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"strconv"
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"strings"
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"github.com/rclone/rclone/lib/encoder"
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)
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const (
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edgeLeft = iota
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edgeRight
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)
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type mapping struct {
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mask encoder.MultiEncoder
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src, dst []rune
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}
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type stringPair struct {
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a, b string
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}
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const header = `// Code generated by ./internal/gen/main.go. DO NOT EDIT.
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` + `//go:generate go run ./internal/gen/main.go
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package encoder
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`
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var maskBits = []struct {
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mask encoder.MultiEncoder
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name string
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}{
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{encoder.EncodeZero, "EncodeZero"},
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{encoder.EncodeSlash, "EncodeSlash"},
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{encoder.EncodeSingleQuote, "EncodeSingleQuote"},
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{encoder.EncodeBackQuote, "EncodeBackQuote"},
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{encoder.EncodeLtGt, "EncodeLtGt"},
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{encoder.EncodeSquareBracket, "EncodeSquareBracket"},
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{encoder.EncodeSemicolon, "EncodeSemicolon"},
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{encoder.EncodeDollar, "EncodeDollar"},
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{encoder.EncodeDoubleQuote, "EncodeDoubleQuote"},
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{encoder.EncodeColon, "EncodeColon"},
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{encoder.EncodeQuestion, "EncodeQuestion"},
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{encoder.EncodeAsterisk, "EncodeAsterisk"},
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{encoder.EncodePipe, "EncodePipe"},
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{encoder.EncodeHash, "EncodeHash"},
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{encoder.EncodePercent, "EncodePercent"},
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{encoder.EncodeBackSlash, "EncodeBackSlash"},
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{encoder.EncodeCrLf, "EncodeCrLf"},
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{encoder.EncodeDel, "EncodeDel"},
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{encoder.EncodeCtl, "EncodeCtl"},
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{encoder.EncodeLeftSpace, "EncodeLeftSpace"},
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{encoder.EncodeLeftPeriod, "EncodeLeftPeriod"},
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{encoder.EncodeLeftTilde, "EncodeLeftTilde"},
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{encoder.EncodeLeftCrLfHtVt, "EncodeLeftCrLfHtVt"},
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{encoder.EncodeRightSpace, "EncodeRightSpace"},
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{encoder.EncodeRightPeriod, "EncodeRightPeriod"},
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{encoder.EncodeRightCrLfHtVt, "EncodeRightCrLfHtVt"},
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{encoder.EncodeInvalidUtf8, "EncodeInvalidUtf8"},
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{encoder.EncodeDot, "EncodeDot"},
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}
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type edge struct {
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mask encoder.MultiEncoder
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name string
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edge int
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orig []rune
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replace []rune
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}
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var allEdges = []edge{
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{encoder.EncodeLeftSpace, "EncodeLeftSpace", edgeLeft, []rune{' '}, []rune{'␠'}},
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{encoder.EncodeLeftPeriod, "EncodeLeftPeriod", edgeLeft, []rune{'.'}, []rune{'．'}},
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{encoder.EncodeLeftTilde, "EncodeLeftTilde", edgeLeft, []rune{'~'}, []rune{'～'}},
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{encoder.EncodeLeftCrLfHtVt, "EncodeLeftCrLfHtVt", edgeLeft,
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[]rune{'\t', '\n', '\v', '\r'},
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[]rune{'␀' + '\t', '␀' + '\n', '␀' + '\v', '␀' + '\r'},
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},
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{encoder.EncodeRightSpace, "EncodeRightSpace", edgeRight, []rune{' '}, []rune{'␠'}},
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{encoder.EncodeRightPeriod, "EncodeRightPeriod", edgeRight, []rune{'.'}, []rune{'．'}},
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{encoder.EncodeRightCrLfHtVt, "EncodeRightCrLfHtVt", edgeRight,
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[]rune{'\t', '\n', '\v', '\r'},
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[]rune{'␀' + '\t', '␀' + '\n', '␀' + '\v', '␀' + '\r'},
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},
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}
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var allMappings = []mapping{{
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encoder.EncodeZero, []rune{
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0,
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}, []rune{
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'␀',
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}}, {
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encoder.EncodeSlash, []rune{
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'/',
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}, []rune{
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'／',
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}}, {
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encoder.EncodeLtGt, []rune{
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'<', '>',
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}, []rune{
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'＜', '＞',
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}}, {
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encoder.EncodeSquareBracket, []rune{
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'[', ']',
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}, []rune{
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'［', '］',
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}}, {
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encoder.EncodeSemicolon, []rune{
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';',
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}, []rune{
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'；',
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}}, {
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encoder.EncodeDoubleQuote, []rune{
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'"',
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}, []rune{
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'＂',
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}}, {
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encoder.EncodeSingleQuote, []rune{
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'\'',
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}, []rune{
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'＇',
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}}, {
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encoder.EncodeBackQuote, []rune{
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'`',
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}, []rune{
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'｀',
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}}, {
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encoder.EncodeDollar, []rune{
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'$',
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}, []rune{
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'＄',
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}}, {
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encoder.EncodeColon, []rune{
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':',
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}, []rune{
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'：',
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}}, {
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encoder.EncodeQuestion, []rune{
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'?',
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}, []rune{
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'？',
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}}, {
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encoder.EncodeAsterisk, []rune{
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'*',
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}, []rune{
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'＊',
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}}, {
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encoder.EncodePipe, []rune{
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'|',
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}, []rune{
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'｜',
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}}, {
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encoder.EncodeHash, []rune{
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'#',
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}, []rune{
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'＃',
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}}, {
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encoder.EncodePercent, []rune{
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'%',
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}, []rune{
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'％',
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}}, {
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encoder.EncodeSlash, []rune{
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'/',
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}, []rune{
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'／',
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}}, {
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encoder.EncodeBackSlash, []rune{
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'\\',
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}, []rune{
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'＼',
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}}, {
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encoder.EncodeCrLf, []rune{
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rune(0x0D), rune(0x0A),
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}, []rune{
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'␍', '␊',
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}}, {
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encoder.EncodeDel, []rune{
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0x7F,
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}, []rune{
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'␡',
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}}, {
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encoder.EncodeCtl,
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runeRange(0x01, 0x1F),
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runeRange('␁', '␟'),
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}}
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var (
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rng *rand.Rand
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printables = runeRange(0x20, 0x7E)
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fullwidthPrintables = runeRange(0xFF00, 0xFF5E)
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encodables = collectEncodables(allMappings)
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encoded = collectEncoded(allMappings)
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greek = runeRange(0x03B1, 0x03C9)
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)
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func main() {
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seed := flag.Int64("s", 42, "random seed")
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flag.Parse()
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rng = rand.New(rand.NewSource(*seed))
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fd, err := os.Create("encoder_cases_test.go")
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fatal(err, "Unable to open encoder_cases_test.go:")
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defer func() {
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fatal(fd.Close(), "Failed to close encoder_cases_test.go:")
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}()
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fatalW(fd.WriteString(header))("Failed to write header:")
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fatalW(fd.WriteString("var testCasesSingle = []testCase{\n\t"))("Write:")
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_i := 0
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i := func() (r int) {
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r, _i = _i, _i+1
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return
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}
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for _, m := range maskBits {
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if len(getMapping(m.mask).src) == 0 {
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continue
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}
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if _i != 0 {
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fatalW(fd.WriteString(" "))("Write:")
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}
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in, out := buildTestString(
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[]mapping{getMapping(m.mask)}, // pick
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[]mapping{getMapping(0)}, // quote
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printables, fullwidthPrintables, encodables, encoded, greek) // fill
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fatalW(fmt.Fprintf(fd, `{ // %d
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mask: %s,
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in: %s,
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out: %s,
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},`, i(), m.name, strconv.Quote(in), strconv.Quote(out)))("Error writing test case:")
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}
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fatalW(fd.WriteString(`
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}
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var testCasesSingleEdge = []testCase{
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`))("Write:")
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_i = 0
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for _, e := range allEdges {
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for idx, orig := range e.orig {
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if _i != 0 {
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fatalW(fd.WriteString(" "))("Write:")
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}
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fatalW(fmt.Fprintf(fd, `{ // %d
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mask: %s,
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in: %s,
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out: %s,
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},`, i(), e.name, strconv.Quote(string(orig)), strconv.Quote(string(e.replace[idx]))))("Error writing test case:")
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}
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for _, m := range maskBits {
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if len(getMapping(m.mask).src) == 0 || invalidMask(e.mask|m.mask) {
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continue
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}
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for idx, orig := range e.orig {
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replace := e.replace[idx]
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pairs := buildEdgeTestString(
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[]edge{e}, []mapping{getMapping(0), getMapping(m.mask)}, // quote
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[][]rune{printables, fullwidthPrintables, encodables, encoded, greek}, // fill
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func(rIn, rOut []rune, quoteOut []bool, testMappings []mapping) (out []stringPair) {
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testL := len(rIn)
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skipOrig := false
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for _, m := range testMappings {
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if runePos(orig, m.src) != -1 || runePos(orig, m.dst) != -1 {
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skipOrig = true
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break
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}
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}
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if !skipOrig {
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rIn[10], rOut[10], quoteOut[10] = orig, orig, false
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}
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out = append(out, stringPair{string(rIn), quotedToString(rOut, quoteOut)})
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for _, i := range []int{0, 1, testL - 2, testL - 1} {
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for _, j := range []int{1, testL - 2, testL - 1} {
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if j < i {
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continue
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}
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rIn := append([]rune{}, rIn...)
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rOut := append([]rune{}, rOut...)
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quoteOut := append([]bool{}, quoteOut...)
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for _, in := range []rune{orig, replace} {
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expect, quote := in, false
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if i == 0 && e.edge == edgeLeft ||
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i == testL-1 && e.edge == edgeRight {
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expect, quote = replace, in == replace
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}
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rIn[i], rOut[i], quoteOut[i] = in, expect, quote
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if i != j {
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for _, in := range []rune{orig, replace} {
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expect, quote = in, false
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if j == testL-1 && e.edge == edgeRight {
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expect, quote = replace, in == replace
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}
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rIn[j], rOut[j], quoteOut[j] = in, expect, quote
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}
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}
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out = append(out, stringPair{string(rIn), quotedToString(rOut, quoteOut)})
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}
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}
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}
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return
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})
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for _, p := range pairs {
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fatalW(fmt.Fprintf(fd, ` { // %d
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mask: %s | %s,
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in: %s,
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out: %s,
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},`, i(), m.name, e.name, strconv.Quote(p.a), strconv.Quote(p.b)))("Error writing test case:")
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}
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}
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}
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}
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fatalW(fmt.Fprintf(fd, ` { // %d
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mask: EncodeLeftSpace,
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in: " ",
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out: "␠ ",
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}, { // %d
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mask: EncodeLeftPeriod,
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in: "..",
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out: "．.",
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}, { // %d
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mask: EncodeLeftTilde,
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in: "~~",
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out: "～~",
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}, { // %d
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mask: EncodeRightSpace,
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in: " ",
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out: " ␠",
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}, { // %d
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mask: EncodeRightPeriod,
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in: "..",
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out: ".．",
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}, { // %d
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mask: EncodeLeftSpace | EncodeRightPeriod,
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in: " .",
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out: "␠．",
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}, { // %d
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mask: EncodeLeftSpace | EncodeRightSpace,
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in: " ",
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out: "␠",
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}, { // %d
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mask: EncodeLeftSpace | EncodeRightSpace,
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in: " ",
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out: "␠␠",
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}, { // %d
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mask: EncodeLeftSpace | EncodeRightSpace,
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in: " ",
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out: "␠ ␠",
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}, { // %d
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mask: EncodeLeftPeriod | EncodeRightPeriod,
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in: "...",
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out: "．.．",
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}, { // %d
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mask: EncodeRightPeriod | EncodeRightSpace,
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in: "a. ",
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out: "a.␠",
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}, { // %d
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mask: EncodeRightPeriod | EncodeRightSpace,
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in: "a .",
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out: "a ．",
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},
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}
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var testCasesDoubleEdge = []testCase{
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`, i(), i(), i(), i(), i(), i(), i(), i(), i(), i(), i(), i()))("Error writing test case:")
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_i = 0
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for _, e1 := range allEdges {
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for _, e2 := range allEdges {
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if e1.mask == e2.mask {
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continue
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}
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for _, m := range maskBits {
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if len(getMapping(m.mask).src) == 0 || invalidMask(m.mask|e1.mask|e2.mask) {
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continue
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}
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orig, replace := e1.orig[0], e1.replace[0]
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edges := []edge{e1, e2}
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pairs := buildEdgeTestString(
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edges, []mapping{getMapping(0), getMapping(m.mask)}, // quote
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[][]rune{printables, fullwidthPrintables, encodables, encoded, greek}, // fill
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func(rIn, rOut []rune, quoteOut []bool, testMappings []mapping) (out []stringPair) {
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testL := len(rIn)
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for _, i := range []int{0, testL - 1} {
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for _, secondOrig := range e2.orig {
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rIn := append([]rune{}, rIn...)
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rOut := append([]rune{}, rOut...)
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quoteOut := append([]bool{}, quoteOut...)
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rIn[1], rOut[1], quoteOut[1] = secondOrig, secondOrig, false
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rIn[testL-2], rOut[testL-2], quoteOut[testL-2] = secondOrig, secondOrig, false
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for _, in := range []rune{orig, replace} {
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rIn[i], rOut[i], quoteOut[i] = in, in, false
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fixEdges(rIn, rOut, quoteOut, edges)
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out = append(out, stringPair{string(rIn), quotedToString(rOut, quoteOut)})
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}
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}
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}
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return
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})
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for _, p := range pairs {
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if _i != 0 {
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fatalW(fd.WriteString(" "))("Write:")
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}
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fatalW(fmt.Fprintf(fd, `{ // %d
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mask: %s | %s | %s,
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in: %s,
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out: %s,
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},`, i(), m.name, e1.name, e2.name, strconv.Quote(p.a), strconv.Quote(p.b)))("Error writing test case:")
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}
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}
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}
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}
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fatalW(fmt.Fprint(fd, "\n}\n"))("Error writing test case:")
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}
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func fatal(err error, s ...interface{}) {
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if err != nil {
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log.Fatalln(append(s, err))
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}
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}
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func fatalW(_ int, err error) func(...interface{}) {
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if err != nil {
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return func(s ...interface{}) {
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log.Fatalln(append(s, err))
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}
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}
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return func(s ...interface{}) {}
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}
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func invalidMask(mask encoder.MultiEncoder) bool {
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return mask&(encoder.EncodeCtl|encoder.EncodeCrLf) != 0 && mask&(encoder.EncodeLeftCrLfHtVt|encoder.EncodeRightCrLfHtVt) != 0
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}
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// construct a slice containing the runes between (l)ow (inclusive) and (h)igh (inclusive)
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func runeRange(l, h rune) []rune {
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if h < l {
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panic("invalid range")
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}
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out := make([]rune, h-l+1)
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for i := range out {
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out[i] = l + rune(i)
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}
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return out
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}
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func getMapping(mask encoder.MultiEncoder) mapping {
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for _, m := range allMappings {
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if m.mask == mask {
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return m
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}
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}
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return mapping{}
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}
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func collectEncodables(m []mapping) (out []rune) {
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for _, s := range m {
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out = append(out, s.src...)
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}
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return
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}
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func collectEncoded(m []mapping) (out []rune) {
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for _, s := range m {
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out = append(out, s.dst...)
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}
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return
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}
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func buildTestString(mappings, testMappings []mapping, fill ...[]rune) (string, string) {
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combinedMappings := append(mappings, testMappings...)
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var (
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rIn []rune
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rOut []rune
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)
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for _, m := range mappings {
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if len(m.src) == 0 || len(m.src) != len(m.dst) {
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panic("invalid length")
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}
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rIn = append(rIn, m.src...)
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rOut = append(rOut, m.dst...)
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}
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inL := len(rIn)
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testL := inL * 3
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if testL < 30 {
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testL = 30
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}
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rIn = append(rIn, make([]rune, testL-inL)...)
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rOut = append(rOut, make([]rune, testL-inL)...)
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quoteOut := make([]bool, testL)
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set := func(i int, in, out rune, quote bool) {
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rIn[i] = in
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rOut[i] = out
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quoteOut[i] = quote
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}
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for i, r := range rOut[:inL] {
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set(inL+i, r, r, true)
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}
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outer:
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for pos := inL * 2; pos < testL; pos++ {
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m := pos % len(fill)
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i := rng.Intn(len(fill[m]))
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r := fill[m][i]
|
||
for _, m := range combinedMappings {
|
||
if pSrc := runePos(r, m.src); pSrc != -1 {
|
||
set(pos, r, m.dst[pSrc], false)
|
||
continue outer
|
||
} else if pDst := runePos(r, m.dst); pDst != -1 {
|
||
set(pos, r, r, true)
|
||
continue outer
|
||
}
|
||
}
|
||
set(pos, r, r, false)
|
||
}
|
||
|
||
rng.Shuffle(testL, func(i, j int) {
|
||
rIn[i], rIn[j] = rIn[j], rIn[i]
|
||
rOut[i], rOut[j] = rOut[j], rOut[i]
|
||
quoteOut[i], quoteOut[j] = quoteOut[j], quoteOut[i]
|
||
})
|
||
|
||
var bOut strings.Builder
|
||
bOut.Grow(testL)
|
||
for i, r := range rOut {
|
||
if quoteOut[i] {
|
||
bOut.WriteRune(encoder.QuoteRune)
|
||
}
|
||
bOut.WriteRune(r)
|
||
}
|
||
return string(rIn), bOut.String()
|
||
}
|
||
|
||
func buildEdgeTestString(edges []edge, testMappings []mapping, fill [][]rune,
|
||
gen func(rIn, rOut []rune, quoteOut []bool, testMappings []mapping) []stringPair,
|
||
) []stringPair {
|
||
testL := 30
|
||
rIn := make([]rune, testL) // test input string
|
||
rOut := make([]rune, testL) // test output string without quote runes
|
||
quoteOut := make([]bool, testL) // if true insert quote rune before the output rune
|
||
|
||
set := func(i int, in, out rune, quote bool) {
|
||
rIn[i] = in
|
||
rOut[i] = out
|
||
quoteOut[i] = quote
|
||
}
|
||
|
||
// populate test strings with values from the `fill` set
|
||
outer:
|
||
for pos := 0; pos < testL; pos++ {
|
||
m := pos % len(fill)
|
||
i := rng.Intn(len(fill[m]))
|
||
r := fill[m][i]
|
||
for _, m := range testMappings {
|
||
if pSrc := runePos(r, m.src); pSrc != -1 {
|
||
set(pos, r, m.dst[pSrc], false)
|
||
continue outer
|
||
} else if pDst := runePos(r, m.dst); pDst != -1 {
|
||
set(pos, r, r, true)
|
||
continue outer
|
||
}
|
||
}
|
||
set(pos, r, r, false)
|
||
}
|
||
|
||
rng.Shuffle(testL, func(i, j int) {
|
||
rIn[i], rIn[j] = rIn[j], rIn[i]
|
||
rOut[i], rOut[j] = rOut[j], rOut[i]
|
||
quoteOut[i], quoteOut[j] = quoteOut[j], quoteOut[i]
|
||
})
|
||
fixEdges(rIn, rOut, quoteOut, edges)
|
||
return gen(rIn, rOut, quoteOut, testMappings)
|
||
}
|
||
|
||
func fixEdges(rIn, rOut []rune, quoteOut []bool, edges []edge) {
|
||
testL := len(rIn)
|
||
for _, e := range edges {
|
||
for idx, o := range e.orig {
|
||
r := e.replace[idx]
|
||
if e.edge == edgeLeft && rIn[0] == o {
|
||
rOut[0], quoteOut[0] = r, false
|
||
} else if e.edge == edgeLeft && rIn[0] == r {
|
||
quoteOut[0] = true
|
||
} else if e.edge == edgeRight && rIn[testL-1] == o {
|
||
rOut[testL-1], quoteOut[testL-1] = r, false
|
||
} else if e.edge == edgeRight && rIn[testL-1] == r {
|
||
quoteOut[testL-1] = true
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
func runePos(r rune, s []rune) int {
|
||
for i, c := range s {
|
||
if c == r {
|
||
return i
|
||
}
|
||
}
|
||
return -1
|
||
}
|
||
|
||
// quotedToString returns a string for the chars slice where an encoder.QuoteRune is
|
||
// inserted before a char[i] when quoted[i] is true.
|
||
func quotedToString(chars []rune, quoted []bool) string {
|
||
var out strings.Builder
|
||
out.Grow(len(chars))
|
||
for i, r := range chars {
|
||
if quoted[i] {
|
||
out.WriteRune(encoder.QuoteRune)
|
||
}
|
||
out.WriteRune(r)
|
||
}
|
||
return out.String()
|
||
}
|