umx_compiler

commit 65428752a41df1171c0ba4735b8f6f7c4766dc88
parent b438a9f973e08ee8d875e56c9d51e65d322bd6b3
Author: bsandro <email@bsandro.tech>
Date:   Fri, 17 Jun 2022 02:42:22 +0300

Parentheses grouping support

Diffstat:
M
parser/parser.go
 | 
11
+++++++++++
M
parser/parser_test.go
 | 
3
+++

2 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/parser/parser.go b/parser/parser.go
@@ -70,6 +70,8 @@ func New(l *lexer.Lexer) *Parser {
 	p.registerPrefix(token.TRUE, p.parseBoolean)
 	p.registerPrefix(token.FALSE, p.parseBoolean)
 
+	p.registerPrefix(token.LPAREN, p.parseGroupedExpression)
+
 	return p
 }
 
@@ -253,3 +255,12 @@ func (p *Parser) parseInfixExpression(left ast.Expression) ast.Expression {
 func (p *Parser) parseBoolean() ast.Expression {
 	return &ast.Boolean{Token: p.curToken, Value: p.curTokenIs(token.TRUE)}
 }
+
+func (p *Parser) parseGroupedExpression() ast.Expression {
+	p.nextToken()
+	expr := p.parseExpression(LOWEST)
+	if !p.expectPeek(token.RPAREN) {
+		return nil
+	}
+	return expr
+}
diff --git a/parser/parser_test.go b/parser/parser_test.go
@@ -347,6 +347,9 @@ func TestOperatorPrecedenceParsing(t *testing.T) {
 		{"true", "true"},
 		{"false", "false"},
 		{"3<5==true==!false", "{{{3 < 5} == true} == {!false}}"},
+		{"!(true == true)", "{!{true == true}}"},
+		{"2/(5+5)", "{2 / {5 + 5}}"},
+		{"-(5+5)", "{-{5 + 5}}"},
 	}
 
 	for _, tt := range tests {