From df253a64c573da766cf63577855496f35d14e48a Mon Sep 17 00:00:00 2001
From: Joe Davidson <joe.davidson.21111@gmail.com>
Date: Fri, 28 Jul 2023 13:55:12 +0100
Subject: [PATCH] fix: allow underscores in template calls (#118)

---
 parser/v2/templelementparser.go      |  1 +
 parser/v2/templelementparser_test.go | 23 ++++++++++++++++++++++-
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/parser/v2/templelementparser.go b/parser/v2/templelementparser.go
index 77d1be3dc..07e164fe9 100644
--- a/parser/v2/templelementparser.go
+++ b/parser/v2/templelementparser.go
@@ -18,6 +18,7 @@ var templElementStartExpressionParams = parse.StringFrom(
 var templElementStartExpression = ExpressionOf(parse.StringFrom(
 	parse.AtLeast(1, parse.StringFrom(
 		parse.StringFrom(parse.Optional(parse.String("."))),
+		parse.StringFrom(parse.Optional(parse.String("_"))),
 		parse.RuneInRanges(unicode.Letter),
 		parse.StringFrom(parse.AtMost(255, parse.RuneInRanges(unicode.Letter, unicode.Number))),
 		parse.StringFrom(parse.Optional(templElementStartExpressionParams)),
diff --git a/parser/v2/templelementparser_test.go b/parser/v2/templelementparser_test.go
index ad92c48be..b15aaf2a2 100644
--- a/parser/v2/templelementparser_test.go
+++ b/parser/v2/templelementparser_test.go
@@ -8,7 +8,7 @@ import (
 )
 
 func TestTemplElementExpressionParser(t *testing.T) {
-	var tests = []struct {
+	tests := []struct {
 		name     string
 		input    string
 		expected TemplElementExpression
@@ -34,6 +34,27 @@ func TestTemplElementExpressionParser(t *testing.T) {
 				},
 			},
 		},
+		{
+			name:  "templelement: simple with underscore",
+			input: `@Other_Component(p.Test)` + "\n",
+			expected: TemplElementExpression{
+				Expression: Expression{
+					Value: "Other_Component(p.Test)",
+					Range: Range{
+						From: Position{
+							Index: 1,
+							Line:  0,
+							Col:   1,
+						},
+						To: Position{
+							Index: 24,
+							Line:  0,
+							Col:   24,
+						},
+					},
+				},
+			},
+		},
 		{
 			name: "templelement: simple, block with text",
 			input: `@Other(p.Test) {