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token.go
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token.go
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package tpl
import (
"strconv"
)
// -----------------------------------------------------------------------------
// Token
const (
ILLEGAL uint = iota
EOF
COMMENT
IDENT // main
INT // 12345
FLOAT // 123.45
IMAG // 123.45i
CHAR // 'a'
STRING // "abc"
ADD = '+'
SUB = '-'
MUL = '*'
QUO = '/'
REM = '%'
AND = '&'
OR = '|'
XOR = '^'
LT = '<'
GT = '>'
ASSIGN = '='
NOT = '!'
LPAREN = '('
LBRACK = '['
LBRACE = '{'
COMMA = ','
PERIOD = '.'
RPAREN = ')'
RBRACK = ']'
RBRACE = '}'
SEMICOLON = ';'
COLON = ':'
QUESTION = '?'
TILDE = '~'
AT = '@'
)
const (
operator_beg uint = 0x80 + iota
SHL // <<
SHR // >>
AND_NOT // &^
ADD_ASSIGN // +=
SUB_ASSIGN // -=
MUL_ASSIGN // *=
QUO_ASSIGN // /=
REM_ASSIGN // %=
AND_ASSIGN // &=
OR_ASSIGN // |=
XOR_ASSIGN // ^=
SHL_ASSIGN // <<=
SHR_ASSIGN // >>=
AND_NOT_ASSIGN // &^=
LAND // &&
LOR // ||
ARROW // <-
INC // ++
DEC // --
EQ // ==
NE // !=
LE // <=
GE // >=
DEFINE // :=
ELLIPSIS // ...
USER_TOKEN_BEGIN uint = 0xb0
)
// -----------------------------------------------------------------------------
var tokens = [...]string{
ILLEGAL: "ILLEGAL",
EOF: "EOF",
COMMENT: "COMMENT",
IDENT: "IDENT",
INT: "INT",
FLOAT: "FLOAT",
IMAG: "IMAG",
CHAR: "CHAR",
STRING: "STRING",
ADD: "'+'",
SUB: "'-'",
MUL: "'*'",
QUO: "'/'",
REM: "'%'",
AND: "'&'",
OR: "'|'",
XOR: "'^'",
LT: "'<'",
GT: "'>'",
ASSIGN: "'='",
NOT: "'!'",
LPAREN: "'('",
LBRACK: "'['",
LBRACE: "'{'",
COMMA: "','",
PERIOD: "'.'",
RPAREN: "')'",
RBRACK: "']'",
RBRACE: "'}'",
SEMICOLON: "';'",
COLON: "':'",
QUESTION: "'?'",
TILDE: "'~'",
AT: "'@'",
SHL: "\"<<\"",
SHR: "\">>\"",
AND_NOT: "\"&^\"",
ADD_ASSIGN: "\"+=\"",
SUB_ASSIGN: "\"-=\"",
MUL_ASSIGN: "\"*=\"",
QUO_ASSIGN: "\"/=\"",
REM_ASSIGN: "\"%=\"",
AND_ASSIGN: "\"&=\"",
OR_ASSIGN: "\"|=\"",
XOR_ASSIGN: "\"^=\"",
SHL_ASSIGN: "\"<<=\"",
SHR_ASSIGN: "\">>=\"",
AND_NOT_ASSIGN: "\"&^=\"",
LAND: "\"&&\"",
LOR: "\"||\"",
ARROW: "\"<-\"",
INC: "\"++\"",
DEC: "\"--\"",
EQ: "\"==\"",
NE: "\"!=\"",
LE: "\"<=\"",
GE: "\">=\"",
DEFINE: "\":=\"",
ELLIPSIS: "\"...\"",
}
// TokenLen returns:
// 1) len of is token literal, if token is an operator.
// 2) 0 for else.
//
func TokenLen(tok uint) int {
if tok > ' ' && tok <= uint(len(tokens)) {
return len(tokens[tok]) - 2
}
return 0
}
// -----------------------------------------------------------------------------
// Token2Lit - token => literal
func Token2Lit(tok uint) (s string) {
if tok < uint(len(tokens)) {
s = tokens[tok]
} else {
panic("unknown token: " + strconv.Itoa(int(tok)))
}
return
}
var rtokens map[string]uint
func init() {
rtokens = make(map[string]uint, 64)
for i, s := range tokens {
if s != "" {
rtokens[s] = uint(i)
}
}
}
// Lit2Token - literal => token
func Lit2Token(lit string) (tok uint) {
return rtokens[lit]
}
// -----------------------------------------------------------------------------