133 lines
3.0 KiB
Go
133 lines
3.0 KiB
Go
// Copyright 2013 The ql Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSES/QL-LICENSE file.
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// 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 expression
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import (
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"fmt"
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"regexp"
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"github.com/juju/errors"
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"github.com/pingcap/tidb/context"
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)
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var (
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_ Expression = (*PatternRegexp)(nil)
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)
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// PatternRegexp is the pattern expression for pattern match.
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// TODO: refactor later.
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type PatternRegexp struct {
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// Expr is the expression to be checked.
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Expr Expression
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// Pattern is the expression for pattern.
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Pattern Expression
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// Re is the compiled regexp.
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Re *regexp.Regexp
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// Sexpr is the string for Expr expression.
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Sexpr *string
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// Not is true, the expression is "not rlike",
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Not bool
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}
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// Clone implements the Expression Clone interface.
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func (p *PatternRegexp) Clone() Expression {
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expr := p.Expr.Clone()
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pattern := p.Pattern.Clone()
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return &PatternRegexp{
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Expr: expr,
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Pattern: pattern,
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Re: p.Re,
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Sexpr: p.Sexpr,
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Not: p.Not,
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}
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}
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// IsStatic implements the Expression IsStatic interface.
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func (p *PatternRegexp) IsStatic() bool {
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return p.Expr.IsStatic() && p.Pattern.IsStatic()
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}
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// String implements the Expression String interface.
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func (p *PatternRegexp) String() string {
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return fmt.Sprintf("%s RLIKE %s", p.Expr, p.Pattern)
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}
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// Eval implements the Expression Eval interface.
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func (p *PatternRegexp) Eval(ctx context.Context, args map[interface{}]interface{}) (v interface{}, err error) {
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var sexpr string
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var ok bool
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switch {
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case p.Sexpr != nil:
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sexpr = *p.Sexpr
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default:
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expr, err := p.Expr.Eval(ctx, args)
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if err != nil {
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return nil, err
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}
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if expr == nil {
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return nil, nil
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}
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sexpr, ok = expr.(string)
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if !ok {
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return nil, errors.Errorf("non-string Expression in LIKE: %v (Value of type %T)", expr, expr)
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}
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if p.Expr.IsStatic() {
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p.Sexpr = new(string)
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*p.Sexpr = sexpr
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}
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}
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re := p.Re
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if re == nil {
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pattern, err := p.Pattern.Eval(ctx, args)
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if err != nil {
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return nil, err
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}
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if pattern == nil {
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return nil, nil
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}
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spattern, ok := pattern.(string)
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if !ok {
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return nil, errors.Errorf("non-string pattern in LIKE: %v (Value of type %T)", pattern, pattern)
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}
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if re, err = regexp.Compile(spattern); err != nil {
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return nil, err
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}
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if p.Pattern.IsStatic() {
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p.Re = re
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}
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}
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match := re.MatchString(sexpr)
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if p.Not {
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return !match, nil
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}
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return match, nil
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}
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// Accept implements Expression Accept interface.
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func (p *PatternRegexp) Accept(v Visitor) (Expression, error) {
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return v.VisitPatternRegexp(p)
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}
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