From dd5fd3372cdb53e7a3a36b5ef61b0b0c35023798 Mon Sep 17 00:00:00 2001
From: Ryo Nihei <nihei.dev@gmail.com>
Date: Mon, 9 May 2022 00:36:06 +0900
Subject: Add ordered symbol notation

---
 spec/parser.go | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

(limited to 'spec/parser.go')

diff --git a/spec/parser.go b/spec/parser.go
index 3b5907e..9c66bfb 100644
--- a/spec/parser.go
+++ b/spec/parser.go
@@ -55,12 +55,13 @@ type DirectiveNode struct {
 }
 
 type ParameterNode struct {
-	ID        string
-	Pattern   string
-	String    string
-	Group     []*DirectiveNode
-	Expansion bool
-	Pos       Position
+	ID            string
+	Pattern       string
+	String        string
+	OrderedSymbol string
+	Group         []*DirectiveNode
+	Expansion     bool
+	Pos           Position
 }
 
 type FragmentNode struct {
@@ -461,6 +462,14 @@ func (p *parser) parseParameter() *ParameterNode {
 			String: p.lastTok.text,
 			Pos:    p.lastTok.pos,
 		}
+	case p.consume(tokenKindOrderedSymbolMarker):
+		if !p.consume(tokenKindID) {
+			raiseSyntaxError(p.pos.Row, synErrNoOrderedSymbolName)
+		}
+		param = &ParameterNode{
+			OrderedSymbol: p.lastTok.text,
+			Pos:           p.lastTok.pos,
+		}
 	case p.consume(tokenKindLParen):
 		pos := p.lastTok.pos
 		var g []*DirectiveNode
-- 
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