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checker.go
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/
checker.go
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// Copyright (c) 2019 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package strconv
// NB: for nicer table formatting.
const (
// Indicates this rune does not need escaping.
ff = false
// Indicates this rune needs escaping.
tt = true
)
// Determines valid characters that do not require escaping.
//
// NB: escape all control characters, `"`, and any character above `~`. This
// table loosely based on constants used in utf8.DecodeRune.
var escape = [256]bool{
// 1 2 3 4 5 6 7 8 9 A B C D E F
tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, // 0x00-0x0F
tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, // 0x10-0x1F
ff, ff, tt, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, // 0x20-0x2F
ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, // 0x30-0x3F
ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, // 0x40-0x4F
ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, // 0x50-0x5F
ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, // 0x60-0x6F
ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, tt, // 0x70-0x7F
// 1 2 3 4 5 6 7 8 9 A B C D E F
tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, // 0x80-0x8F
tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, // 0x90-0x9F
tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, // 0xA0-0xAF
tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, // 0xB0-0xBF
tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, // 0xC0-0xCF
tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, // 0xD0-0xDF
tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, // 0xE0-0xEF
tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, // 0xF0-0xFF
}
// NeedToEscape returns true if the byte slice contains characters that will
// need to be escaped when quoting the slice.
func NeedToEscape(bb []byte) bool {
for _, b := range bb {
if escape[b] {
return true
}
}
return false
}
// Determines valid alphanumeric characters.
var alphaNumeric = [256]bool{
// 1 2 3 4 5 6 7 8 9 A B C D E F
ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, // 0x00-0x0F
ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, // 0x10-0x1F
ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, // 0x20-0x2F
tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, ff, ff, ff, ff, ff, ff, // 0x30-0x3F
ff, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, // 0x40-0x4F
tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, ff, ff, ff, ff, ff, // 0x50-0x5F
ff, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, // 0x60-0x6F
tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, tt, ff, ff, ff, ff, ff, // 0x70-0x7F
// 1 2 3 4 5 6 7 8 9 A B C D E F
ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, // 0x80-0x8F
ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, // 0x90-0x9F
ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, // 0xA0-0xAF
ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, // 0xB0-0xBF
ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, // 0xC0-0xCF
ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, // 0xD0-0xDF
ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, // 0xE0-0xEF
ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, // 0xF0-0xFF
}
// IsAlphaNumeric returns true if the given string is alpha numeric.
//
// NB: here this means that it contains only characters in [0-9A-Za-z])
func IsAlphaNumeric(str string) bool {
for _, c := range str {
if !alphaNumeric[c] {
return false
}
}
return true
}
// IsRuneAlphaNumeric returns true if the given rune is alpha numeric.
//
// NB: here this means that it contains only characters in [0-9A-Za-z])
func IsRuneAlphaNumeric(r rune) bool {
return alphaNumeric[r]
}