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57 lines
1.6 KiB
57 lines
1.6 KiB
// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ast
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import (
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"fmt"
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"github.com/pingcap/tidb/util/types"
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)
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// ToString converts a node to a string for debugging purpose.
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func ToString(node Node) string {
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s := &stringer{strMap: map[Node]string{}}
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node.Accept(s)
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return s.strMap[node]
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}
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type stringer struct {
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strMap map[Node]string
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}
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// Enter implements Visitor Enter interface.
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func (c *stringer) Enter(node Node) (Node, bool) {
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return node, false
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}
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// Leave implements Visitor Leave interface.
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func (c *stringer) Leave(in Node) (out Node, ok bool) {
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switch x := in.(type) {
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case *BinaryOperationExpr:
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left := c.strMap[x.L]
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right := c.strMap[x.R]
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c.strMap[x] = left + " " + x.Op.String() + " " + right
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case *ValueExpr:
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str, _ := types.ToString(x.GetValue())
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c.strMap[x] = str
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case *ParenthesesExpr:
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c.strMap[x] = "(" + c.strMap[x.Expr] + ")"
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case *ColumnNameExpr:
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c.strMap[x] = x.Name.Table.O + "." + x.Name.Name.O
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case *BetweenExpr:
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c.strMap[x] = c.strMap[x.Expr] + " BETWWEN " + c.strMap[x.Left] + " AND " + c.strMap[x.Right]
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default:
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c.strMap[in] = fmt.Sprintf("%T", in)
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}
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return in, true
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}
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