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