62 lines
986 B
Go
62 lines
986 B
Go
|
package expression
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"go/token"
|
||
|
|
"strconv"
|
||
|
|
)
|
||
|
|
|
||
|
|
type Token struct {
|
||
|
|
Token token.Token
|
||
|
|
Literal string
|
||
|
|
Pos int
|
||
|
|
}
|
||
|
|
|
||
|
|
func (t *Token) Int() (int, bool) {
|
||
|
|
if t.Token != token.INT {
|
||
|
|
return 0, false
|
||
|
|
}
|
||
|
|
i, _ := strconv.Atoi(t.Literal)
|
||
|
|
return i, true
|
||
|
|
}
|
||
|
|
|
||
|
|
func (t *Token) Float() float64 {
|
||
|
|
i, _ := strconv.ParseFloat(t.Literal, 64)
|
||
|
|
return i
|
||
|
|
}
|
||
|
|
|
||
|
|
func (t *Token) IsNumber() bool {
|
||
|
|
return t.Token == token.INT || t.Token == token.FLOAT
|
||
|
|
}
|
||
|
|
|
||
|
|
func (t *Token) LP() bool {
|
||
|
|
return t.Token == token.LPAREN
|
||
|
|
}
|
||
|
|
|
||
|
|
func (t *Token) RP() bool {
|
||
|
|
return t.Token == token.RPAREN
|
||
|
|
}
|
||
|
|
|
||
|
|
func (t *Token) IsFunc() bool {
|
||
|
|
return t.Token == token.IDENT
|
||
|
|
}
|
||
|
|
|
||
|
|
func (t *Token) IsSeparator() bool {
|
||
|
|
return t.Token == token.COMMA
|
||
|
|
}
|
||
|
|
|
||
|
|
func (t *Token) IsOperator() bool {
|
||
|
|
return t.Token.IsOperator() && !t.LP() && !t.RP()
|
||
|
|
}
|
||
|
|
|
||
|
|
func (t *Token) IsError() bool {
|
||
|
|
return t.Token != token.ILLEGAL
|
||
|
|
}
|
||
|
|
|
||
|
|
func (t *Token) Error() error {
|
||
|
|
if t.Token != token.ILLEGAL {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
return fmt.Errorf(t.Literal)
|
||
|
|
}
|