From ba524fa0d49f597a4ace4bec72802334a0972c7a Mon Sep 17 00:00:00 2001
From: Ryo Nihei <nihei.dev@gmail.com>
Date: Wed, 23 Mar 2022 02:04:56 +0900
Subject: Use grammar via an interface

---
 driver/spec.go | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 driver/spec.go

(limited to 'driver/spec.go')

diff --git a/driver/spec.go b/driver/spec.go
new file mode 100644
index 0000000..71935b4
--- /dev/null
+++ b/driver/spec.go
@@ -0,0 +1,84 @@
+package driver
+
+import (
+	mldriver "github.com/nihei9/maleeni/driver"
+	"github.com/nihei9/vartan/spec"
+)
+
+type gram struct {
+	g *spec.CompiledGrammar
+}
+
+func NewGrammar(g *spec.CompiledGrammar) *gram {
+	return &gram{
+		g: g,
+	}
+}
+
+func (g *gram) LexicalSpecification() mldriver.LexSpec {
+	return mldriver.NewLexSpec(g.g.LexicalSpecification.Maleeni.Spec)
+}
+
+func (g *gram) Class() string {
+	return g.g.ParsingTable.Class
+}
+
+func (g *gram) InitialState() int {
+	return g.g.ParsingTable.InitialState
+}
+
+func (g *gram) StartProduction() int {
+	return g.g.ParsingTable.StartProduction
+}
+
+func (g *gram) RecoverProduction(prod int) bool {
+	return g.g.ParsingTable.RecoverProductions[prod] != 0
+}
+
+func (g *gram) Action(state int, terminal int) int {
+	return g.g.ParsingTable.Action[state*g.g.ParsingTable.TerminalCount+terminal]
+}
+
+func (g *gram) GoTo(state int, lhs int) int {
+	return g.g.ParsingTable.GoTo[state*g.g.ParsingTable.NonTerminalCount+lhs]
+}
+
+func (g *gram) AlternativeSymbolCount(prod int) int {
+	return g.g.ParsingTable.AlternativeSymbolCounts[prod]
+}
+
+func (g *gram) TerminalCount() int {
+	return g.g.ParsingTable.TerminalCount
+}
+
+func (g *gram) ErrorTrapperState(state int) bool {
+	return g.g.ParsingTable.ErrorTrapperStates[state] != 0
+}
+
+func (g *gram) LHS(prod int) int {
+	return g.g.ParsingTable.LHSSymbols[prod]
+}
+
+func (g *gram) EOF() int {
+	return g.g.ParsingTable.EOFSymbol
+}
+
+func (g *gram) Error() int {
+	return g.g.ParsingTable.ErrorSymbol
+}
+
+func (g *gram) Terminal(terminal int) string {
+	return g.g.ParsingTable.Terminals[terminal]
+}
+
+func (g *gram) TerminalAlias(terminal int) string {
+	return g.g.LexicalSpecification.Maleeni.KindAliases[terminal]
+}
+
+func (g *gram) Skip(kind mldriver.KindID) bool {
+	return g.g.LexicalSpecification.Maleeni.Skip[kind] > 0
+}
+
+func (g *gram) LexicalKindToTerminal(kind mldriver.KindID) int {
+	return g.g.LexicalSpecification.Maleeni.KindToTerminal[kind]
+}
-- 
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