mirror of
https://github.com/rocky-linux/peridot.git
synced 2024-12-25 20:00:27 +00:00
285 lines
5 KiB
Go
285 lines
5 KiB
Go
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package ini
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import (
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"fmt"
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)
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// getStringValue will return a quoted string and the amount
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// of bytes read
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//
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// an error will be returned if the string is not properly formatted
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func getStringValue(b []rune) (int, error) {
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if b[0] != '"' {
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return 0, NewParseError("strings must start with '\"'")
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}
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endQuote := false
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i := 1
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for ; i < len(b) && !endQuote; i++ {
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if escaped := isEscaped(b[:i], b[i]); b[i] == '"' && !escaped {
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endQuote = true
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break
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} else if escaped {
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/*c, err := getEscapedByte(b[i])
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if err != nil {
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return 0, err
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}
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b[i-1] = c
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b = append(b[:i], b[i+1:]...)
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i--*/
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continue
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}
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}
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if !endQuote {
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return 0, NewParseError("missing '\"' in string value")
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}
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return i + 1, nil
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}
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// getBoolValue will return a boolean and the amount
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// of bytes read
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//
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// an error will be returned if the boolean is not of a correct
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// value
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func getBoolValue(b []rune) (int, error) {
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if len(b) < 4 {
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return 0, NewParseError("invalid boolean value")
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}
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n := 0
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for _, lv := range literalValues {
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if len(lv) > len(b) {
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continue
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}
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if isLitValue(lv, b) {
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n = len(lv)
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}
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}
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if n == 0 {
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return 0, NewParseError("invalid boolean value")
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}
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return n, nil
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}
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// getNumericalValue will return a numerical string, the amount
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// of bytes read, and the base of the number
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//
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// an error will be returned if the number is not of a correct
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// value
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func getNumericalValue(b []rune) (int, int, error) {
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if !isDigit(b[0]) {
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return 0, 0, NewParseError("invalid digit value")
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}
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i := 0
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helper := numberHelper{}
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loop:
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for negativeIndex := 0; i < len(b); i++ {
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negativeIndex++
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if !isDigit(b[i]) {
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switch b[i] {
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case '-':
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if helper.IsNegative() || negativeIndex != 1 {
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return 0, 0, NewParseError("parse error '-'")
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}
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n := getNegativeNumber(b[i:])
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i += (n - 1)
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helper.Determine(b[i])
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continue
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case '.':
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if err := helper.Determine(b[i]); err != nil {
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return 0, 0, err
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}
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case 'e', 'E':
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if err := helper.Determine(b[i]); err != nil {
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return 0, 0, err
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}
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negativeIndex = 0
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case 'b':
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if helper.numberFormat == hex {
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break
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}
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fallthrough
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case 'o', 'x':
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if i == 0 && b[i] != '0' {
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return 0, 0, NewParseError("incorrect base format, expected leading '0'")
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}
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if i != 1 {
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return 0, 0, NewParseError(fmt.Sprintf("incorrect base format found %s at %d index", string(b[i]), i))
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}
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if err := helper.Determine(b[i]); err != nil {
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return 0, 0, err
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}
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default:
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if isWhitespace(b[i]) {
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break loop
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}
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if isNewline(b[i:]) {
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break loop
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}
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if !(helper.numberFormat == hex && isHexByte(b[i])) {
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if i+2 < len(b) && !isNewline(b[i:i+2]) {
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return 0, 0, NewParseError("invalid numerical character")
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} else if !isNewline([]rune{b[i]}) {
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return 0, 0, NewParseError("invalid numerical character")
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}
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break loop
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}
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}
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}
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}
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return helper.Base(), i, nil
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}
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// isDigit will return whether or not something is an integer
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func isDigit(b rune) bool {
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return b >= '0' && b <= '9'
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}
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func hasExponent(v []rune) bool {
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return contains(v, 'e') || contains(v, 'E')
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}
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func isBinaryByte(b rune) bool {
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switch b {
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case '0', '1':
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return true
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default:
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return false
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}
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}
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func isOctalByte(b rune) bool {
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switch b {
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case '0', '1', '2', '3', '4', '5', '6', '7':
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return true
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default:
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return false
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}
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}
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func isHexByte(b rune) bool {
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if isDigit(b) {
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return true
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}
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return (b >= 'A' && b <= 'F') ||
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(b >= 'a' && b <= 'f')
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}
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func getValue(b []rune) (int, error) {
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i := 0
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for i < len(b) {
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if isNewline(b[i:]) {
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break
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}
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if isOp(b[i:]) {
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break
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}
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valid, n, err := isValid(b[i:])
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if err != nil {
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return 0, err
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}
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if !valid {
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break
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}
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i += n
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}
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return i, nil
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}
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// getNegativeNumber will return a negative number from a
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// byte slice. This will iterate through all characters until
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// a non-digit has been found.
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func getNegativeNumber(b []rune) int {
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if b[0] != '-' {
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return 0
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}
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i := 1
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for ; i < len(b); i++ {
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if !isDigit(b[i]) {
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return i
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}
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}
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return i
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}
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// isEscaped will return whether or not the character is an escaped
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// character.
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func isEscaped(value []rune, b rune) bool {
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if len(value) == 0 {
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return false
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}
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switch b {
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case '\'': // single quote
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case '"': // quote
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case 'n': // newline
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case 't': // tab
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case '\\': // backslash
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default:
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return false
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}
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return value[len(value)-1] == '\\'
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}
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func getEscapedByte(b rune) (rune, error) {
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switch b {
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case '\'': // single quote
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return '\'', nil
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case '"': // quote
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return '"', nil
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case 'n': // newline
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return '\n', nil
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case 't': // table
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return '\t', nil
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case '\\': // backslash
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return '\\', nil
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default:
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return b, NewParseError(fmt.Sprintf("invalid escaped character %c", b))
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}
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}
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func removeEscapedCharacters(b []rune) []rune {
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for i := 0; i < len(b); i++ {
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if isEscaped(b[:i], b[i]) {
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c, err := getEscapedByte(b[i])
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if err != nil {
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return b
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}
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b[i-1] = c
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b = append(b[:i], b[i+1:]...)
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i--
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}
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}
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return b
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}
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