Add support for increment and decrement expressions

nokia · Jul 8, 2024 · 89a0fda · 89a0fda
1 parent e9a7d8b
commit 89a0fda
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Showing 3 changed files with 79 additions and 1 deletion.
diff --git a/ttcn3/syntax/nodes.go b/ttcn3/syntax/nodes.go
@@ -191,6 +191,12 @@ type (
 		X  Expr
 	}
 
+	// A postfix expresseion (i++, i--)
+	PostExpr struct {
+		X  Expr
+		Op Token
+	}
+
 	// A BinaryExpr represents a binary expression.
 	// Possible operands are all tokens with a precedence value, TO and FROM.
 	BinaryExpr struct {
@@ -338,6 +344,7 @@ func (x *ParametrizedIdent) exprNode() {}
 func (x *ValueLiteral) exprNode()      {}
 func (x *CompositeLiteral) exprNode()  {}
 func (x *UnaryExpr) exprNode()         {}
+func (x *PostExpr) exprNode()          {}
 func (x *BinaryExpr) exprNode()        {}
 func (x *ParenExpr) exprNode()         {}
 func (x *SelectorExpr) exprNode()      {}

diff --git a/ttcn3/syntax/nodes_gen.go b/ttcn3/syntax/nodes_gen.go
diff --git a/ttcn3/syntax/parser.go b/ttcn3/syntax/parser.go
@@ -621,6 +621,10 @@ func (p *parser) parseBinaryExpr(prec1 int) Expr {
 func (p *parser) parsePostfixExpr() Expr {
 	x := p.parseUnaryExpr()
 
+	if p.tok == INC || p.tok == DEC {
+		x = &PostExpr{X: x, Op: p.consume()}
+	}
+
 	if p.tok == LENGTH {
 		x = p.parseLength(x)
 	}
@@ -658,7 +662,7 @@ func (p *parser) parsePostfixExpr() Expr {
 //	| PrimaryExpr
 func (p *parser) parseUnaryExpr() Expr {
 	switch p.tok {
-	case ADD, EXCL, NOT, NOT4B, SUB:
+	case ADD, EXCL, NOT, NOT4B, SUB, INC, DEC:
 		tok := p.consume()
 		// handle unused expr '-'
 		if tok.Kind() == SUB {