php2go/quote.go

41 lines
967 B
Go
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package main
import (
"errors"
"fmt"
"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
// PROBLEM 1: PHP has some lax parsing for unknown escape sequences
// e.g. regex("foo\.") will be silently parsed as regex("foo.")
// PROBLEM 2: PHP supports multiline string literals, strconv.Unquote does not
// Apply fixup
s2 := strings.Replace(strings.Replace(s, "\r", `\r`, -1), "\n", `\n`, -1)
ret, err := strconv.Unquote(s2)
if err != nil {
return "", fmt.Errorf("Parsing string literal `%s`: %v", s, err)
}
return ret, nil
}
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")
}