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|
package tokens
import (
"encoding/json"
"fmt"
)
type TokenId int
func (t TokenId) String() string {
return tokenStr[t]
}
func (t TokenId) MarshalJSON() ([]byte, error) {
return json.Marshal(t.String())
}
const (
Eof TokenId = iota
Ident
None
True
False
Var
Const
Def
TNumber
TBool
TString
TFunc
TStruct
TArray
Return
If
Else
For
In
Continue
Break
Number
Char
String
Or
And
Eq
Ne
Ge
Le
BitShr
BitShl
TagE
LBrace
RBrace
LParen
RParen
LBracket
RBracket
Semicolon
Comma
Add
Sub
Mul
Mod
Div
Neg
Dot
Assign
Gt
Lt
Not
BitOr
BitAnd
BitXor
TestE
)
var (
tokenStr = []string{
"Eof",
"Ident",
// keywords
"none",
"True",
"False",
"Var",
"Const",
"Def",
"number",
"bool",
"string",
"func",
"struct",
"array",
"Return",
"If",
"Else",
"For",
"In",
"Continue",
"Break",
// literals
"Number",
"Character",
"String",
// double char
"Or",
"And",
"Eq",
"NE",
"Ge",
"Le",
"BitShr",
"BitShl",
"TagE",
// single character
"LBrace",
"RBrace",
"LParen",
"RParen",
"LBracket",
"RBracket",
"Semicolon",
"Comma",
"Add",
"Sub",
"Mul",
"Mod",
"Div",
"Neg",
"Dot",
"Assign",
"Gt",
"Lt",
"Not",
"BitOr",
"BitAnd",
"BitXor",
"TestE",
}
)
type Location struct {
File string `json:"file"`
Line int `json:"line"`
Column int `json:"col"`
}
func (l Location) String() string {
return fmt.Sprintf("%s:%d:%d", l.File, l.Line, l.Column)
}
func (l *Location) Inc() {
l.Column++
}
func (l *Location) Add(cols int) {
l.Column += cols
}
func (l *Location) Eol() {
l.Line++
l.Column = 1
}
type Token struct {
Id TokenId `json:"id"`
Loc Location `json:"loc"`
Value string `json:"val,omitempty"`
}
func (t Token) String() string {
switch t.Id {
case Ident:
return fmt.Sprintf("'%s'", t.Value)
default:
return fmt.Sprintf("%s at %s", t.Id, t.Loc)
}
}
|
