php2go/quote.go

package main

import (
	"errors"
	"strconv"
	"strings"
)

func phpUnquote(s string) (string, error) {
	if len(s) == 0 {
		return "", errors.New("expected quotes around string")
	}

	if s[0] == '"' {
		// Quote system is similar enough to Go's that strconv will probably just work
		// PHP has some lax parsing for unknown escape sequences
		// e.g. regex("foo\.") will be silently parsed as regex("foo.")

		return strconv.Unquote(s)
	}

	if s[0] == '\'' {
		// Single-quotes escape fewer things
		unSQuo := strings.NewReplacer(`\'`, `'`, `\\`, `\`)
		return unSQuo.Replace(s[1 : len(s)-1]), nil
	}

	return "", errors.New("expected single/double quotes")
}