diff options
Diffstat (limited to 'vendor/github.com/hashicorp/hcl/hcl/strconv/quote.go')
| -rw-r--r-- | vendor/github.com/hashicorp/hcl/hcl/strconv/quote.go | 241 |
1 files changed, 0 insertions, 241 deletions
diff --git a/vendor/github.com/hashicorp/hcl/hcl/strconv/quote.go b/vendor/github.com/hashicorp/hcl/hcl/strconv/quote.go deleted file mode 100644 index 5f981ea..0000000 --- a/vendor/github.com/hashicorp/hcl/hcl/strconv/quote.go +++ /dev/null @@ -1,241 +0,0 @@ -package strconv - -import ( - "errors" - "unicode/utf8" -) - -// ErrSyntax indicates that a value does not have the right syntax for the target type. -var ErrSyntax = errors.New("invalid syntax") - -// Unquote interprets s as a single-quoted, double-quoted, -// or backquoted Go string literal, returning the string value -// that s quotes. (If s is single-quoted, it would be a Go -// character literal; Unquote returns the corresponding -// one-character string.) -func Unquote(s string) (t string, err error) { - n := len(s) - if n < 2 { - return "", ErrSyntax - } - quote := s[0] - if quote != s[n-1] { - return "", ErrSyntax - } - s = s[1 : n-1] - - if quote != '"' { - return "", ErrSyntax - } - if !contains(s, '$') && !contains(s, '{') && contains(s, '\n') { - return "", ErrSyntax - } - - // Is it trivial? Avoid allocation. - if !contains(s, '\\') && !contains(s, quote) && !contains(s, '$') { - switch quote { - case '"': - return s, nil - case '\'': - r, size := utf8.DecodeRuneInString(s) - if size == len(s) && (r != utf8.RuneError || size != 1) { - return s, nil - } - } - } - - var runeTmp [utf8.UTFMax]byte - buf := make([]byte, 0, 3*len(s)/2) // Try to avoid more allocations. - for len(s) > 0 { - // If we're starting a '${}' then let it through un-unquoted. - // Specifically: we don't unquote any characters within the `${}` - // section. - if s[0] == '$' && len(s) > 1 && s[1] == '{' { - buf = append(buf, '$', '{') - s = s[2:] - - // Continue reading until we find the closing brace, copying as-is - braces := 1 - for len(s) > 0 && braces > 0 { - r, size := utf8.DecodeRuneInString(s) - if r == utf8.RuneError { - return "", ErrSyntax - } - - s = s[size:] - - n := utf8.EncodeRune(runeTmp[:], r) - buf = append(buf, runeTmp[:n]...) - - switch r { - case '{': - braces++ - case '}': - braces-- - } - } - if braces != 0 { - return "", ErrSyntax - } - if len(s) == 0 { - // If there's no string left, we're done! - break - } else { - // If there's more left, we need to pop back up to the top of the loop - // in case there's another interpolation in this string. - continue - } - } - - if s[0] == '\n' { - return "", ErrSyntax - } - - c, multibyte, ss, err := unquoteChar(s, quote) - if err != nil { - return "", err - } - s = ss - if c < utf8.RuneSelf || !multibyte { - buf = append(buf, byte(c)) - } else { - n := utf8.EncodeRune(runeTmp[:], c) - buf = append(buf, runeTmp[:n]...) - } - if quote == '\'' && len(s) != 0 { - // single-quoted must be single character - return "", ErrSyntax - } - } - return string(buf), nil -} - -// contains reports whether the string contains the byte c. -func contains(s string, c byte) bool { - for i := 0; i < len(s); i++ { - if s[i] == c { - return true - } - } - return false -} - -func unhex(b byte) (v rune, ok bool) { - c := rune(b) - switch { - case '0' <= c && c <= '9': - return c - '0', true - case 'a' <= c && c <= 'f': - return c - 'a' + 10, true - case 'A' <= c && c <= 'F': - return c - 'A' + 10, true - } - return -} - -func unquoteChar(s string, quote byte) (value rune, multibyte bool, tail string, err error) { - // easy cases - switch c := s[0]; { - case c == quote && (quote == '\'' || quote == '"'): - err = ErrSyntax - return - case c >= utf8.RuneSelf: - r, size := utf8.DecodeRuneInString(s) - return r, true, s[size:], nil - case c != '\\': - return rune(s[0]), false, s[1:], nil - } - - // hard case: c is backslash - if len(s) <= 1 { - err = ErrSyntax - return - } - c := s[1] - s = s[2:] - - switch c { - case 'a': - value = '\a' - case 'b': - value = '\b' - case 'f': - value = '\f' - case 'n': - value = '\n' - case 'r': - value = '\r' - case 't': - value = '\t' - case 'v': - value = '\v' - case 'x', 'u', 'U': - n := 0 - switch c { - case 'x': - n = 2 - case 'u': - n = 4 - case 'U': - n = 8 - } - var v rune - if len(s) < n { - err = ErrSyntax - return - } - for j := 0; j < n; j++ { - x, ok := unhex(s[j]) - if !ok { - err = ErrSyntax - return - } - v = v<<4 | x - } - s = s[n:] - if c == 'x' { - // single-byte string, possibly not UTF-8 - value = v - break - } - if v > utf8.MaxRune { - err = ErrSyntax - return - } - value = v - multibyte = true - case '0', '1', '2', '3', '4', '5', '6', '7': - v := rune(c) - '0' - if len(s) < 2 { - err = ErrSyntax - return - } - for j := 0; j < 2; j++ { // one digit already; two more - x := rune(s[j]) - '0' - if x < 0 || x > 7 { - err = ErrSyntax - return - } - v = (v << 3) | x - } - s = s[2:] - if v > 255 { - err = ErrSyntax - return - } - value = v - case '\\': - value = '\\' - case '\'', '"': - if c != quote { - err = ErrSyntax - return - } - value = rune(c) - default: - err = ErrSyntax - return - } - tail = s - return -} |