ai_old/goja_nodejs/url/escape.go

package url

import "strings"

var tblEscapeURLQuery = [128]byte{
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
}

var tblEscapeURLQueryParam = [128]byte{
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0,
	0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,
	0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
}

// The code below is mostly borrowed from the standard Go url package

const upperhex = "0123456789ABCDEF"

func ishex(c byte) bool {
	switch {
	case '0' <= c && c <= '9':
		return true
	case 'a' <= c && c <= 'f':
		return true
	case 'A' <= c && c <= 'F':
		return true
	}
	return false
}

func unhex(c byte) byte {
	switch {
	case '0' <= c && c <= '9':
		return c - '0'
	case 'a' <= c && c <= 'f':
		return c - 'a' + 10
	case 'A' <= c && c <= 'F':
		return c - 'A' + 10
	}
	return 0
}

func escape(s string, table *[128]byte, spaceToPlus bool) string {
	spaceCount, hexCount := 0, 0
	for i := 0; i < len(s); i++ {
		c := s[i]
		if c > 127 || table[c] == 0 {
			if c == ' ' && spaceToPlus {
				spaceCount++
			} else {
				hexCount++
			}
		}
	}

	if spaceCount == 0 && hexCount == 0 {
		return s
	}

	var sb strings.Builder
	hexBuf := [3]byte{'%', 0, 0}

	sb.Grow(len(s) + 2*hexCount)

	for i := 0; i < len(s); i++ {
		switch c := s[i]; {
		case c == ' ' && spaceToPlus:
			sb.WriteByte('+')
		case c > 127 || table[c] == 0:
			hexBuf[1] = upperhex[c>>4]
			hexBuf[2] = upperhex[c&15]
			sb.Write(hexBuf[:])
		default:
			sb.WriteByte(c)
		}
	}
	return sb.String()
}

func unescapeSearchParam(s string) string {
	n := 0
	hasPlus := false
	for i := 0; i < len(s); {
		switch s[i] {
		case '%':
			if i+2 >= len(s) || !ishex(s[i+1]) || !ishex(s[i+2]) {
				i++
				continue
			}
			n++
			i += 3
		case '+':
			hasPlus = true
			i++
		default:
			i++
		}
	}

	if n == 0 && !hasPlus {
		return s
	}

	var t strings.Builder
	t.Grow(len(s) - 2*n)
	for i := 0; i < len(s); i++ {
		switch s[i] {
		case '%':
			if i+2 >= len(s) || !ishex(s[i+1]) || !ishex(s[i+2]) {
				t.WriteByte('%')
			} else {
				t.WriteByte(unhex(s[i+1])<<4 | unhex(s[i+2]))
				i += 2
			}
		case '+':
			t.WriteByte(' ')
		default:
			t.WriteByte(s[i])
		}
	}
	return t.String()
}