ast, parser: fix formatting of if with inline comments (fix #7796) (#14018)

vlib/v/fmt/tests/if_cond_with_inline_comments_expected.vv

@@ -0,0 +1,13 @@
+fn main() {
+	a, b := true, true
+
+	// a
+	if a || b {
+		println('hi')
+	}
+
+	// a
+	if a || b {
+		println('hi')
+	}
+}

vlib/v/fmt/tests/if_cond_with_inline_comments_input.vv

@@ -0,0 +1,10 @@
+fn main() {
+		a, b := true, true
+
+        if a || // a
+                b {
+			println('hi')
+        }
+
+		if a /* a */ || b {println('hi')}
+}

vlib/v/parser/expr.v

@@ -21,6 +21,9 @@ pub fn (mut p Parser) check_expr(precedence int) ?ast.Expr {
 	if !p.pref.is_fmt {
 		p.eat_comments()
 	}
+	if p.inside_if_cond {
+		p.if_cond_comments << p.eat_comments()
+	}
 	inside_array_lit := p.inside_array_lit
 	p.inside_array_lit = false
 	defer {
@@ -350,6 +353,9 @@ pub fn (mut p Parser) check_expr(precedence int) ?ast.Expr {
 			return node
 		}
 	}
+	if p.inside_if_cond {
+		p.if_cond_comments << p.eat_comments()
+	}
 	return p.expr_with_left(node, precedence, is_stmt_ident)
 }
 
@@ -481,6 +487,9 @@ fn (mut p Parser) infix_expr(left ast.Expr) ast.Expr {
 	precedence := p.tok.precedence()
 	mut pos := p.tok.pos()
 	p.next()
+	if p.inside_if_cond {
+		p.if_cond_comments << p.eat_comments()
+	}
 	mut right := ast.empty_expr()
 	prev_expecting_type := p.expecting_type
 	if op in [.key_is, .not_is] {

vlib/v/parser/if_match.v

@@ -128,7 +128,13 @@ fn (mut p Parser) if_expr(is_comptime bool) ast.IfExpr {
 		} else {
 			prev_guard = false
 			p.comptime_if_cond = true
+			p.inside_if_cond = true
 			cond = p.expr(0)
+			p.inside_if_cond = false
+			if p.if_cond_comments.len > 0 {
+				comments << p.if_cond_comments
+				p.if_cond_comments = []
+			}
 			p.comptime_if_cond = false
 		}
 		comments << p.eat_comments()

vlib/v/parser/parser.v

@@ -36,6 +36,7 @@ mut:
 	inside_test_file          bool // when inside _test.v or _test.vv file
 	inside_if                 bool
 	inside_if_expr            bool
+	inside_if_cond            bool
 	inside_ct_if_expr         bool
 	inside_or_expr            bool
 	inside_for                bool
@@ -90,6 +91,7 @@ mut:
 	should_abort              bool // when too many errors/warnings/notices are accumulated, should_abort becomes true, and the parser should stop
 	codegen_text              string
 	struct_init_generic_types []ast.Type
+	if_cond_comments          []ast.Comment
 }
 
 __global codegen_files = []&ast.File{}