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ast.go
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ast.go
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// Copyright 2020 Marius Ackerman
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/*
Package ast is an Abstract Syntax Tree for gogll, used for code generation.
*/
package ast
import (
"sort"
"github.com/goccmack/gogll/v3/token"
"github.com/goccmack/goutil/stringset"
)
type GoGLL struct {
Package *Package
LexRules []*LexRule
SyntaxRules []*SyntaxRule
Terminals *stringset.StringSet
NonTerminals *stringset.StringSet
StringLiterals map[string]*StringLit
}
type NT struct {
tok *token.Token
}
type Package struct {
tok *token.Token
}
type TokID struct {
tok *token.Token
}
type Terminal interface {
isTerminal()
}
type Position struct {
Line, Column int
File string
}
/*** Methods ***/
func (g *GoGLL) GetLexRule(id string) *LexRule {
for _, r := range g.LexRules {
if r.TokID.ID() == id {
return r
}
}
return nil
}
// GetStringLiterals returns a sorted slice of the string literals
func (g *GoGLL) GetStringLiterals() []string {
slits := make([]string, 0, len(g.StringLiterals))
for _, sl := range g.StringLiterals {
slits = append(slits, string(sl.Value()))
}
sort.Slice(slits, func(i, j int) bool { return slits[i] < slits[j] })
return slits
}
// GetStringLiteralsSet returns a stringset containing the string literals
func (g *GoGLL) GetStringLiteralsSet() *stringset.StringSet {
return stringset.New(g.GetStringLiterals()...)
}
func (g *GoGLL) GetSyntaxRule(nt string) *SyntaxRule {
for _, r := range g.SyntaxRules {
if r.Head.ID() == nt {
return r
}
}
return nil
}
func (g *GoGLL) GetSymbols() []string {
return append(g.Terminals.Elements(), g.NonTerminals.Elements()...)
}
func (g *GoGLL) StartSymbol() string {
return g.SyntaxRules[0].Head.ID()
}
func (n *NT) String() string {
return n.tok.LiteralString()
}
func (n *NT) Lext() int {
return n.tok.Lext()
}
// ID returns the identifier of n
func (n *NT) ID() string {
return n.tok.LiteralString()
}
func (p *Package) GetString() string {
return string(p.tok.Literal()[1 : len(p.tok.Literal())-1])
}
func (s *StringLit) String() string {
return string(s.tok.Literal()[1 : len(s.tok.Literal())-1])
}
func (s *StringLit) Lext() int {
return s.tok.Lext()
}
func (t *TokID) String() string {
return t.tok.LiteralString()
}
func (t *TokID) Lext() int {
return t.tok.Lext()
}
func (t *TokID) ID() string {
return t.tok.LiteralStringStripEscape()
}