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token.go
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token.go
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// Code generated by gocc; DO NOT EDIT.
package token
import (
"bytes"
"fmt"
"strconv"
"unicode/utf8"
)
type Token struct {
Type
Lit []byte
Pos
}
type Type int
const (
INVALID Type = iota
EOF
)
type Pos struct {
Offset int
Line int
Column int
Context Context
}
func (p Pos) String() string {
// If the context provides a filename, provide a human-readable File:Line:Column representation.
switch src := p.Context.(type) {
case Sourcer:
return fmt.Sprintf("%s:%d:%d", src.Source(), p.Line, p.Column)
default:
return fmt.Sprintf("Pos(offset=%d, line=%d, column=%d)", p.Offset, p.Line, p.Column)
}
}
type TokenMap struct {
typeMap []string
idMap map[string]Type
}
func (m TokenMap) Id(tok Type) string {
if int(tok) < len(m.typeMap) {
return m.typeMap[tok]
}
return "unknown"
}
func (m TokenMap) Type(tok string) Type {
if typ, exist := m.idMap[tok]; exist {
return typ
}
return INVALID
}
func (m TokenMap) TokenString(tok *Token) string {
return fmt.Sprintf("%s(%d,%s)", m.Id(tok.Type), tok.Type, tok.Lit)
}
func (m TokenMap) StringType(typ Type) string {
return fmt.Sprintf("%s(%d)", m.Id(typ), typ)
}
// Equals returns returns true if the token Type and Lit are matches.
func (t *Token) Equals(rhs interface{}) bool {
switch rhsT := rhs.(type) {
case *Token:
return t == rhsT || (t.Type == rhsT.Type && bytes.Equal(t.Lit, rhsT.Lit))
default:
return false
}
}
// CharLiteralValue returns the string value of the char literal.
func (t *Token) CharLiteralValue() string {
return string(t.Lit[1 : len(t.Lit)-1])
}
// Float32Value returns the float32 value of the token or an error if the token literal does not
// denote a valid float32.
func (t *Token) Float32Value() (float32, error) {
if v, err := strconv.ParseFloat(string(t.Lit), 32); err != nil {
return 0, err
} else {
return float32(v), nil
}
}
// Float64Value returns the float64 value of the token or an error if the token literal does not
// denote a valid float64.
func (t *Token) Float64Value() (float64, error) {
return strconv.ParseFloat(string(t.Lit), 64)
}
// IDValue returns the string representation of an identifier token.
func (t *Token) IDValue() string {
return string(t.Lit)
}
// Int32Value returns the int32 value of the token or an error if the token literal does not
// denote a valid float64.
func (t *Token) Int32Value() (int32, error) {
if v, err := strconv.ParseInt(string(t.Lit), 10, 64); err != nil {
return 0, err
} else {
return int32(v), nil
}
}
// Int64Value returns the int64 value of the token or an error if the token literal does not
// denote a valid float64.
func (t *Token) Int64Value() (int64, error) {
return strconv.ParseInt(string(t.Lit), 10, 64)
}
// UTF8Rune decodes the UTF8 rune in the token literal. It returns utf8.RuneError if
// the token literal contains an invalid rune.
func (t *Token) UTF8Rune() (rune, error) {
r, _ := utf8.DecodeRune(t.Lit)
if r == utf8.RuneError {
err := fmt.Errorf("Invalid rune")
return r, err
}
return r, nil
}
// StringValue returns the string value of the token literal.
func (t *Token) StringValue() string {
return string(t.Lit[1 : len(t.Lit)-1])
}
var TokMap = TokenMap{
typeMap: []string{
"INVALID",
"␚",
"...42...",
"capitalized",
"lowercase",
},
idMap: map[string]Type{
"INVALID": 0,
"␚": 1,
"...42...": 2,
"capitalized": 3,
"lowercase": 4,
},
}