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|
package ini
import (
"fmt"
)
// getStringValue will return a quoted string and the amount
// of bytes read
//
// an error will be returned if the string is not properly formatted
func getStringValue(b []rune) (int, error) {
if b[0] != '"' {
return 0, NewParseError("strings must start with '\"'")
}
endQuote := false
i := 1
for ; i < len(b) && !endQuote; i++ {
if escaped := isEscaped(b[:i], b[i]); b[i] == '"' && !escaped {
endQuote = true
break
} else if escaped {
/*c, err := getEscapedByte(b[i])
if err != nil {
return 0, err
}
b[i-1] = c
b = append(b[:i], b[i+1:]...)
i--*/
continue
}
}
if !endQuote {
return 0, NewParseError("missing '\"' in string value")
}
return i + 1, nil
}
// getBoolValue will return a boolean and the amount
// of bytes read
//
// an error will be returned if the boolean is not of a correct
// value
func getBoolValue(b []rune) (int, error) {
if len(b) < 4 {
return 0, NewParseError("invalid boolean value")
}
n := 0
for _, lv := range literalValues {
if len(lv) > len(b) {
continue
}
if isLitValue(lv, b) {
n = len(lv)
}
}
if n == 0 {
return 0, NewParseError("invalid boolean value")
}
return n, nil
}
// getNumericalValue will return a numerical string, the amount
// of bytes read, and the base of the number
//
// an error will be returned if the number is not of a correct
// value
func getNumericalValue(b []rune) (int, int, error) {
if !isDigit(b[0]) {
return 0, 0, NewParseError("invalid digit value")
}
i := 0
helper := numberHelper{}
loop:
for negativeIndex := 0; i < len(b); i++ {
negativeIndex++
if !isDigit(b[i]) {
switch b[i] {
case '-':
if helper.IsNegative() || negativeIndex != 1 {
return 0, 0, NewParseError("parse error '-'")
}
n := getNegativeNumber(b[i:])
i += (n - 1)
helper.Determine(b[i])
continue
case '.':
if err := helper.Determine(b[i]); err != nil {
return 0, 0, err
}
case 'e', 'E':
if err := helper.Determine(b[i]); err != nil {
return 0, 0, err
}
negativeIndex = 0
case 'b':
if helper.numberFormat == hex {
break
}
fallthrough
case 'o', 'x':
if i == 0 && b[i] != '0' {
return 0, 0, NewParseError("incorrect base format, expected leading '0'")
}
if i != 1 {
return 0, 0, NewParseError(fmt.Sprintf("incorrect base format found %s at %d index", string(b[i]), i))
}
if err := helper.Determine(b[i]); err != nil {
return 0, 0, err
}
default:
if isWhitespace(b[i]) {
break loop
}
if isNewline(b[i:]) {
break loop
}
if !(helper.numberFormat == hex && isHexByte(b[i])) {
if i+2 < len(b) && !isNewline(b[i:i+2]) {
return 0, 0, NewParseError("invalid numerical character")
} else if !isNewline([]rune{b[i]}) {
return 0, 0, NewParseError("invalid numerical character")
}
break loop
}
}
}
}
return helper.Base(), i, nil
}
// isDigit will return whether or not something is an integer
func isDigit(b rune) bool {
return b >= '0' && b <= '9'
}
func hasExponent(v []rune) bool {
return contains(v, 'e') || contains(v, 'E')
}
func isBinaryByte(b rune) bool {
switch b {
case '0', '1':
return true
default:
return false
}
}
func isOctalByte(b rune) bool {
switch b {
case '0', '1', '2', '3', '4', '5', '6', '7':
return true
default:
return false
}
}
func isHexByte(b rune) bool {
if isDigit(b) {
return true
}
return (b >= 'A' && b <= 'F') ||
(b >= 'a' && b <= 'f')
}
func getValue(b []rune) (int, error) {
i := 0
for i < len(b) {
if isNewline(b[i:]) {
break
}
if isOp(b[i:]) {
break
}
valid, n, err := isValid(b[i:])
if err != nil {
return 0, err
}
if !valid {
break
}
i += n
}
return i, nil
}
// getNegativeNumber will return a negative number from a
// byte slice. This will iterate through all characters until
// a non-digit has been found.
func getNegativeNumber(b []rune) int {
if b[0] != '-' {
return 0
}
i := 1
for ; i < len(b); i++ {
if !isDigit(b[i]) {
return i
}
}
return i
}
// isEscaped will return whether or not the character is an escaped
// character.
func isEscaped(value []rune, b rune) bool {
if len(value) == 0 {
return false
}
switch b {
case '\'': // single quote
case '"': // quote
case 'n': // newline
case 't': // tab
case '\\': // backslash
default:
return false
}
return value[len(value)-1] == '\\'
}
func getEscapedByte(b rune) (rune, error) {
switch b {
case '\'': // single quote
return '\'', nil
case '"': // quote
return '"', nil
case 'n': // newline
return '\n', nil
case 't': // table
return '\t', nil
case '\\': // backslash
return '\\', nil
default:<
|
