Fix parser to support sequential calls to Parse*() functs

crm/repository/ql/ast_parser.go

@@ -25,7 +25,6 @@ type (
 // NewParser returns a new instance of Parser.
 func NewParser() *Parser {
 	p := &Parser{
-		tokbuf:     make([]Token, 3),
 		OnIdent:    func(ident Ident) (Ident, error) { return ident, nil },
 		OnFunction: func(ident Function) (Function, error) { return ident, nil },
 	}
@@ -51,6 +50,7 @@ func (p *Parser) peekToken(s int) Token {
 
 func (p *Parser) initLexer(s string) {
 	p.lexer = NewLexer(strings.NewReader(s))
+	p.tokbuf = make([]Token, 3)
 
 	for c := 1; c < cap(p.tokbuf); c++ {
 		// Fill the buffer

crm/repository/ql/ast_parser_test.go

@@ -242,10 +242,27 @@ func TestAstParser_ColumnParser(t *testing.T) {
 				},
 			},
 		},
+		{
+			in: `DATE_FORMAT(some_date, '%Y-%m-01')`,
+			cols: Columns{
+				Column{
+					Expr: ASTNodes{
+						Function{
+							Name: "DATE_FORMAT",
+							Arguments: ASTSet{
+								Ident{Value: "some_date"},
+								String{Value: "%Y-%m-01"},
+							},
+						},
+					},
+				},
+			},
+		},
 	}
 
+	p := NewParser()
 	for i, test := range tests {
-		if cols, err := NewParser().ParseColumns(test.in); err != test.err {
+		if cols, err := p.ParseColumns(test.in); err != test.err {
 			t.Fatalf("%d. %s: error mismatch:\n  expected: %v\n        got: %v\n\n", i, test.in, test.err, err)
 		} else if test.err == nil && !reflect.DeepEqual(test.cols, cols) {
 			t.Errorf("%d. %s\n\ncols does not match:\n\nexpected: %#v\n     got: %#v\n\n", i, test.in, test.cols, cols)
@@ -265,9 +282,8 @@ func TestAstParser_IdentModifier(t *testing.T) {
 		},
 	}
 
+	p := NewParser()
 	for i, test := range tests {
-		p := NewParser()
-
 		p.OnIdent = func(ident Ident) (Ident, error) {
 			ident.Value = fmt.Sprintf("__wrap_%s_wrap__", ident.Value)
 			return ident, nil