*: add Push Context and Pop Contex

acekingke · Mar 29, 2022 · 18bace1 · 18bace1
1 parent 8522f1d
commit 18bace1
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Showing 3 changed files with 33 additions and 4 deletions.
diff --git a/Builder/GoGenCode.go b/Builder/GoGenCode.go
@@ -13,6 +13,7 @@ import (
 
 	parser "github.com/acekingke/yaccgo/Parser"
 	rules "github.com/acekingke/yaccgo/Rules"
+	utils "github.com/acekingke/yaccgo/Utils"
 )
 
 type GoBuilder struct {
@@ -50,6 +51,13 @@ func (b *GoBuilder) buildUionAndCode() {
 	str := `
 var StateSymStack = []StateSym{}
 var StackPointer = 0
+type Context struct {
+	StackSym []StateSym
+	Stackpos int
+}
+
+var globalContext = []Context{}
+
 type ValType struct {
 	%s
 }
@@ -113,7 +121,17 @@ func (s *StateSym) Action(a int) int {
 func init() {
 	ParserInit()
 }
-
+func PushContex() {
+	globalContext = append(globalContext, Context{
+		StackSym: StateSymStack,
+		Stackpos: StackPointer,
+	})
+}
+func PopContex() {
+	StackPointer = globalContext[len(globalContext)-1].Stackpos
+	StateSymStack = globalContext[len(globalContext)-1].StackSym
+	globalContext = globalContext[:len(globalContext)-1]
+}
 func ParserInit() {
 	StateSymStack = []StateSym{
 		{
@@ -251,7 +269,7 @@ func GoGenFromString(input string, file string) error {
 	b := NewGoBuilder(w)
 	b.buildConstPart()
 	b.buildUionAndCode()
-	if b.vnode.NeedPacked {
+	if b.vnode.NeedPacked && utils.PackFlags {
 		b.buildAnalyPackTable()
 		b.buildPackStateFunc()
 	} else {

diff --git a/Builder/GoGenPackTableCode.go b/Builder/GoGenPackTableCode.go
@@ -54,7 +54,17 @@ func (s *StateSym) Action(a int) int {
 		return StatePackAction[StatePackOffset[s.Yystate]+a]
 	}
 }
-
+func PushContex() {
+	globalContext = append(globalContext, Context{
+		StackSym: StateSymStack,
+		Stackpos: StackPointer,
+	})
+}
+func PopContex() {
+	StackPointer = globalContext[len(globalContext)-1].Stackpos
+	StateSymStack = globalContext[len(globalContext)-1].StackSym
+	globalContext = globalContext[:len(globalContext)-1]
+}
 func init() {
 	ParserInit()
 }
@@ -84,7 +94,7 @@ func Parser(input string) *ValType {
 		s := &StateSymStack[StackPointer-1]
 		a := s.Action(lookAhead)
 		if a == ERROR_ACTION {
-			panic("Grammer error")
+			panic("Grammar parse error")
 		} else if a == ACCEPT_ACTION {
 			return &s.ValType
 		} else {

diff --git a/Utils/flags.go b/Utils/flags.go
@@ -5,3 +5,4 @@ Use of this source code is governed by MIT license that can be found in the LICE
 package utils
 
 var DebugFlags = false
+var PackFlags = true
Original file line number	Diff line number	Diff line change
Expand Up		@@ -5,3 +5,4 @@ Use of this source code is governed by MIT license that can be found in the LICE
		package utils

		var DebugFlags = false
		var PackFlags = true