refactor: allow for in flowing text if for statement not found (#777)

Author: a-h

parser/v2/elementparser.go

@@ -407,7 +407,7 @@ func (elementParser) Parse(pi *parse.Input) (n Node, ok bool, err error) {
 	// Void elements _might_ have children, even though it's invalid.
 	// We want to allow this to be parsed.
 	closer := StripType(parse.All(parse.String("</"), parse.String(ot.Name), parse.Rune('>')))
-	tnp := newTemplateNodeParser[any](closer, fmt.Sprintf("<%s>: close tag", ot.Name))
+	tnp := newTemplateNodeParser(closer, fmt.Sprintf("<%s>: close tag", ot.Name))
 	nodes, _, err := tnp.Parse(pi)
 	if err != nil {
 		notFoundErr, isNotFoundError := err.(UntilNotFoundError)

parser/v2/elementparser_test.go

@@ -1536,6 +1536,29 @@ func TestElementParser(t *testing.T) {
 				},
 			},
 		},
+		{
+			name: "element: can contain text that starts with for",
+			input: `<div>for which any 
+amount is charged</div>`,
+			expected: Element{
+				Name:           "div",
+				IndentChildren: true,
+				NameRange: Range{
+					From: Position{Index: 1, Line: 0, Col: 1},
+					To:   Position{Index: 4, Line: 0, Col: 4},
+				},
+				Children: []Node{
+					Text{
+						Value:         "for which any ",
+						TrailingSpace: SpaceVertical,
+					},
+					Text{
+						Value:         "amount is charged",
+						TrailingSpace: SpaceNone,
+					},
+				},
+			},
+		},
 	}
 	for _, tt := range tests {
 		tt := tt

parser/v2/forexpressionparser.go

@@ -29,8 +29,8 @@ func (forExpressionParser) Parse(pi *parse.Input) (n Node, ok bool, err error) {
 
 	// Eat " {\n".
 	if _, ok, err = parse.All(openBraceWithOptionalPadding, parse.NewLine).Parse(pi); err != nil || !ok {
-		err = parse.Error("for: "+unterminatedMissingCurly, pi.PositionAt(start))
-		return
+		pi.Seek(start)
+		return r, false, err
 	}
 
 	// Node contents.

parser/v2/forexpressionparser_test.go

@@ -140,11 +140,14 @@ func TestForExpressionParser(t *testing.T) {
 
 func TestIncompleteFor(t *testing.T) {
 	t.Run("no opening brace", func(t *testing.T) {
-		input := parse.NewInput(`for with no brace`)
-		_, _, err := forExpression.Parse(input)
-		if err.Error() != "for: unterminated (missing closing '{\\n') - https://templ.guide/syntax-and-usage/statements#incomplete-statements: line 0, col 0" {
+		input := parse.NewInput(`for with no brace is ignored`)
+		_, ok, err := forExpression.Parse(input)
+		if err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}
+		if ok {
+			t.Fatal("expected a non match, but got a match")
+		}
 	})
 	t.Run("capitalised For", func(t *testing.T) {
 		input := parse.NewInput(`For with no brace`)
@@ -153,7 +156,7 @@ func TestIncompleteFor(t *testing.T) {
 			t.Fatalf("unexpected error: %v", err)
 		}
 		if ok {
-			t.Fatal("expected a non match")
+			t.Fatal("expected a non match, but got a match")
 		}
 	})
 }