tools: cleanup the output of V, compiled with -d trace_parser and -d trace_checker

vlib/v/checker/checker.v

@@ -4627,8 +4627,8 @@ fn (mut c Checker) check_loop_label(label string, pos token.Position) {
 
 fn (mut c Checker) stmt(node ast.Stmt) {
 	$if trace_checker ? {
-		stmt_pos := node.pos
-		eprintln('checking file: ${c.file.path:-30} | stmt pos: ${stmt_pos.str():-45} | stmt')
+		ntype := typeof(node).replace('v.ast.', '')
+		eprintln('checking: ${c.file.path:-30} | pos: ${node.pos.line_str():-39} | node: $ntype | $node')
 	}
 	c.expected_type = ast.void_type
 	match mut node {

vlib/v/parser/expr.v

@@ -14,11 +14,7 @@ pub fn (mut p Parser) expr(precedence int) ast.Expr {
 }
 
 pub fn (mut p Parser) check_expr(precedence int) ?ast.Expr {
-	$if trace_parser ? {
-		tok_pos := p.tok.position()
-		eprintln('parsing file: ${p.file_name:-30} | tok.kind: ${p.tok.kind:-10} | tok.lit: ${p.tok.lit:-10} | tok_pos: ${tok_pos.str():-45} | expr($precedence)')
-	}
-
+	p.trace_parser('expr($precedence)')
 	mut node := ast.empty_expr()
 	is_stmt_ident := p.is_stmt_ident
 	p.is_stmt_ident = false

vlib/v/parser/parser.v

@@ -509,11 +509,13 @@ fn (mut p Parser) check_name() string {
 	return name
 }
 
+[if trace_parser ?]
+fn (p &Parser) trace_parser(label string) {
+	eprintln('parsing: ${p.file_name:-30}|tok.pos: ${p.tok.position().line_str():-39}|tok.kind: ${p.tok.kind:-10}|tok.lit: ${p.tok.lit:-10}|$label')
+}
+
 pub fn (mut p Parser) top_stmt() ast.Stmt {
-	$if trace_parser ? {
-		tok_pos := p.tok.position()
-		eprintln('parsing file: ${p.file_name:-30} | tok.kind: ${p.tok.kind:-10} | tok.lit: ${p.tok.lit:-10} | tok_pos: ${tok_pos.str():-45} | top_stmt')
-	}
+	p.trace_parser('top_stmt')
 	for {
 		match p.tok.kind {
 			.key_pub {
@@ -686,10 +688,7 @@ pub fn (mut p Parser) eat_comments(cfg EatCommentsConfig) []ast.Comment {
 }
 
 pub fn (mut p Parser) stmt(is_top_level bool) ast.Stmt {
-	$if trace_parser ? {
-		tok_pos := p.tok.position()
-		eprintln('parsing file: ${p.file_name:-30} | tok.kind: ${p.tok.kind:-10} | tok.lit: ${p.tok.lit:-10} | tok_pos: ${tok_pos.str():-45} | stmt($is_top_level)')
-	}
+	p.trace_parser('stmt($is_top_level)')
 	p.is_stmt_ident = p.tok.kind == .name
 	match p.tok.kind {
 		.lcbr {

vlib/v/token/position.v

@@ -17,6 +17,10 @@ pub mut:
 pub fn (mut p Position) free() {
 }
 
+pub fn (p Position) line_str() string {
+	return '{l: ${p.line_nr + 1:5}, c: ${p.col:3}, p: ${p.pos:5}, ll: ${p.last_line + 1:5}}'
+}
+
 pub fn (pos Position) extend(end Position) Position {
 	return Position{
 		...pos