*: fix the bug for eof token

acekingke · Mar 29, 2022 · 1ff30a5 · 1ff30a5
1 parent 68d53fc
commit 1ff30a5
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Showing 4 changed files with 8 additions and 1 deletion.
diff --git a/Builder/GoGenCode.go b/Builder/GoGenCode.go
@@ -135,7 +135,7 @@ 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/Parser/Lex.go b/Parser/Lex.go
@@ -107,6 +107,9 @@ func rootState(l *lexer) stateFn {
 		l.backup()
 		l.acceptRun("0123456789")
 		l.emit(Number)
+	case r == '-':
+		l.acceptRun("0123456789")
+		l.emit(Number)
 	case r == '{':
 		return ActionQuoteState
 

diff --git a/Parser/Vistor.go b/Parser/Vistor.go
@@ -234,6 +234,9 @@ func (w *Walker) BuildLALR1() *lalr.LALR1 {
 		//1. create symbo
 		index := 1
 		for _, id := range v.idsymtabl {
+			if id.Value == -1 {
+				continue
+			}
 			index++
 			sy := symbol.NewSymbol(uint(index), id.Name)
 			sy.SetValue(id.Value)

diff --git a/examples/e.y b/examples/e.y
@@ -4,6 +4,7 @@ import "fmt"
 %}
 
 %token   'n'
+%token EOF -1
 %start L
 %%
 L :  /*empty*/