checker: fix error messages and add checker tests

* checker: fix error messages
* tests: fix command and ignore defect output

.gitignore

@@ -84,3 +84,7 @@ cachegrind.out.*
 /thirdparty/pg
 exe
 vlib/v/tests/inout/*.v
+!vlib/v/tests/inout/*_test.v
+vlib/v/checker/tests/inout/*.v
+vlib/v/checker/tests/inout/*.c
+!vlib/v/checker/tests/inout/*_test.v

vlib/v/ast/ast.v

@@ -56,6 +56,7 @@ pub:
 	val    string
 	is_raw bool
 	is_c   bool
+	pos    token.Position
 }
 
 // 'name: $name'
@@ -64,6 +65,7 @@ pub:
 	vals       []string
 	exprs      []Expr
 	expr_fmts  []string
+	pos        token.Position
 mut:
 	expr_types []table.Type
 }

vlib/v/checker/checker.v

@@ -1067,8 +1067,8 @@ fn expr_pos(node ast.Expr) token.Position {
 		// ast.ParExpr { }
 		ast.SelectorExpr { return it.pos }
 		// ast.SizeOf { }
-		// ast.StringLiteral { }
+		ast.StringLiteral { return it.pos }
-		// ast.StringInterLiteral { }
+		ast.StringInterLiteral { return it.pos }
 		ast.StructInit { return it.pos }
 		// ast.Type { }
 		// ast.TypeOf { }

vlib/v/checker/tests/inout/checker_error_test.v

@@ -0,0 +1,51 @@
+import os
+import term
+
+fn test_all() {
+	$if windows {
+		return
+	}
+	mut total_errors := 0
+	vexe := os.getenv('VEXE')
+	vroot := os.dir(vexe)
+	dir := os.join_path(vroot,'vlib/v/checker/tests/inout')
+	files := os.ls(dir) or {
+		panic(err)
+	}
+	tests := files.filter(it.ends_with('.vv'))
+	if tests.len == 0 {
+		println('no compiler tests found')
+		assert false
+	}
+	for test in tests {
+		path := os.join_path(dir,test)
+		print(test + ' ')
+		program := path.replace('.vv', '.v')
+		os.cp(path, program) or {
+			panic(err)
+		}
+		res := os.exec('$vexe $program') or {
+			panic(err)
+		}
+		mut expected := os.read_file(program.replace('.v', '') + '.out') or {
+			panic(err)
+		}
+		expected = expected.trim_space().replace(' \n', '\n').replace(' \r\n', '\n').replace('\r\n', '\n').trim('\n')
+		found := res.output.trim_space().replace(' \n', '\n').replace(' \r\n', '\n').replace('\r\n', '\n').trim('\n')
+		if expected != found {
+			println(term.red('FAIL'))
+			println('============')
+			println('expected:')
+			println(expected)
+			println('============')
+			println('found:')
+			println(found)
+			println('============\n')
+			total_errors++
+		}
+		else {
+			println(term.green('OK'))
+		}
+	}
+	assert total_errors == 0
+}

vlib/v/checker/tests/inout/enum_err.out

@@ -0,0 +1,6 @@
+vlib/v/checker/tests/inout/enum_err.v:2:13: error: default value for enum has to be an integer
+    1| enum Color {
+    2|     green = 'green',
+                   ~~~~~~~
+    3|     blue,
+    4| }

vlib/v/checker/tests/inout/enum_err.vv

@@ -0,0 +1,4 @@
+enum Color {
+    green = 'green',
+    blue,
+}

vlib/v/parser/parser.v

@@ -1226,6 +1226,7 @@ fn (p mut Parser) if_expr() ast.IfExpr {
 }
 
 fn (p mut Parser) string_expr() ast.Expr {
+	first_pos := p.tok.position()
 	is_raw := p.tok.kind == .name && p.tok.lit == 'r'
 	is_cstr := p.tok.kind == .name && p.tok.lit == 'c'
 	if is_raw || is_cstr {
@@ -1233,13 +1234,20 @@ fn (p mut Parser) string_expr() ast.Expr {
 	}
 	mut node := ast.Expr{}
 	val := p.tok.lit
+	if p.peek_tok.kind != .str_dollar {
+		p.next()
+		last_pos := p.tok.position()
+		pos := token.Position{
+			line_nr: first_pos.line_nr
+			pos: first_pos.pos
+			len: last_pos.pos - first_pos.pos
+		}
 		node = ast.StringLiteral{
 			val: val
 			is_raw: is_raw
 			is_c: is_cstr
+			pos: pos
 		}
-	if p.peek_tok.kind != .str_dollar {
-		p.next()
 		return node
 	}
 	mut exprs := []ast.Expr
@@ -1275,10 +1283,17 @@ fn (p mut Parser) string_expr() ast.Expr {
 		}
 		efmts << efmt.join('')
 	}
+	last_pos := p.tok.position()
+	pos := token.Position{
+		line_nr: first_pos.line_nr
+		pos: first_pos.pos
+		len: last_pos.pos - first_pos.pos
+	}
 	node = ast.StringInterLiteral{
 		vals: vals
 		exprs: exprs
 		expr_fmts: efmts
+		pos: pos
 	}
 	return node
 }

vlib/v/util/errors.v

@@ -95,10 +95,8 @@ pub fn formatted_error(kind string /*error or warn*/, emsg string, filepath stri
 					}
 					continue
 				}
-				for i in 0..pos.len {
 				underline := '~'.repeat(pos.len)
 				pointerline << if emanager.support_color { term.bold(term.blue(underline)) } else { underline }
-				}
 				break
 			}
 			clines << '       ' + pointerline.join('')