// This file is part of https://github.com/aws/smithy-go/blob/f0c6adfdec6e40bb8bb2920a40d016943b4ad762/encoding/httpbinding/path_replace.go

package httpbinding

import (
	"bytes"
	"fmt"
)

// EscapePath escapes part of a URL path in Amazon style.
func EscapePath(path string, encodeSep bool) string {
	var buf bytes.Buffer
	for i := 0; i < len(path); i++ {
		c := path[i]
		if noEscape[c] || (c == '/' && !encodeSep) {
			buf.WriteByte(c)
		} else {
			fmt.Fprintf(&buf, "%%%02X", c)
		}
	}
	return buf.String()
}

var noEscape [256]bool

func init() {
	for i := 0; i < len(noEscape); i++ {
		// AWS expects every character except these to be escaped
		noEscape[i] = (i >= 'A' && i <= 'Z') ||
			(i >= 'a' && i <= 'z') ||
			(i >= '0' && i <= '9') ||
			i == '-' ||
			i == '.' ||
			i == '_' ||
			i == '~'
	}
}