135 lines
1.9 KiB
Go
135 lines
1.9 KiB
Go
package toml
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import "fmt"
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// Define tokens
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type tokenType int
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const (
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eof = -(iota + 1)
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)
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const (
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tokenError tokenType = iota
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tokenEOF
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tokenComment
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tokenKey
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tokenString
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tokenInteger
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tokenTrue
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tokenFalse
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tokenFloat
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tokenInf
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tokenNan
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tokenEqual
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tokenLeftBracket
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tokenRightBracket
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tokenLeftCurlyBrace
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tokenRightCurlyBrace
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tokenLeftParen
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tokenRightParen
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tokenDoubleLeftBracket
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tokenDoubleRightBracket
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tokenDate
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tokenLocalDate
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tokenKeyGroup
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tokenKeyGroupArray
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tokenComma
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tokenColon
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tokenDollar
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tokenStar
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tokenQuestion
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tokenDot
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tokenDotDot
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tokenEOL
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)
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var tokenTypeNames = []string{
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"Error",
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"EOF",
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"Comment",
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"Key",
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"String",
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"Integer",
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"True",
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"False",
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"Float",
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"Inf",
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"NaN",
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"=",
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"[",
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"]",
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"{",
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"}",
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"(",
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")",
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"]]",
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"[[",
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"LocalDate",
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"LocalDate",
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"KeyGroup",
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"KeyGroupArray",
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",",
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":",
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"$",
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"*",
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"?",
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".",
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"..",
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"EOL",
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}
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type token struct {
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Position
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typ tokenType
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val string
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}
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func (tt tokenType) String() string {
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idx := int(tt)
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if idx < len(tokenTypeNames) {
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return tokenTypeNames[idx]
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}
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return "Unknown"
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}
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func (t token) String() string {
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switch t.typ {
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case tokenEOF:
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return "EOF"
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case tokenError:
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return t.val
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}
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return fmt.Sprintf("%q", t.val)
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}
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func isSpace(r rune) bool {
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return r == ' ' || r == '\t'
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}
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func isAlphanumeric(r rune) bool {
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return 'a' <= r && r <= 'z' || 'A' <= r && r <= 'Z' || r == '_'
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}
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func isKeyChar(r rune) bool {
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// Keys start with the first character that isn't whitespace or [ and end
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// with the last non-whitespace character before the equals sign. Keys
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// cannot contain a # character."
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return !(r == '\r' || r == '\n' || r == eof || r == '=')
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}
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func isKeyStartChar(r rune) bool {
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return !(isSpace(r) || r == '\r' || r == '\n' || r == eof || r == '[')
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}
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func isDigit(r rune) bool {
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return '0' <= r && r <= '9'
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}
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func isHexDigit(r rune) bool {
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return isDigit(r) ||
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(r >= 'a' && r <= 'f') ||
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(r >= 'A' && r <= 'F')
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}
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