90 lines
2.0 KiB
Go
90 lines
2.0 KiB
Go
// 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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. "github.com/pingcap/check"
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)
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var _ = Suite(&testSubstringSuite{})
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type testSubstringSuite struct {
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}
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func (s *testSubstringSuite) TestSubstring(c *C) {
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tbl := []struct {
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str string
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pos int64
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slen int64
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result string
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}{
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{"Quadratically", 5, -1, "ratically"},
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{"foobarbar", 4, -1, "barbar"},
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{"Quadratically", 5, 6, "ratica"},
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{"Sakila", -3, -1, "ila"},
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{"Sakila", -5, 3, "aki"},
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{"Sakila", -4, 2, "ki"},
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{"Sakila", 1000, 2, ""},
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{"", 2, 3, ""},
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}
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for _, v := range tbl {
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f := FunctionSubstring{
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StrExpr: &Value{Val: v.str},
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Pos: &Value{Val: v.pos},
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}
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if v.slen != -1 {
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f.Len = &Value{Val: v.slen}
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}
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c.Assert(f.IsStatic(), Equals, true)
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fs := f.String()
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c.Assert(len(fs), Greater, 0)
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f1 := f.Clone()
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r, err := f.Eval(nil, nil)
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c.Assert(err, IsNil)
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s, ok := r.(string)
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c.Assert(ok, Equals, true)
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c.Assert(s, Equals, v.result)
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r1, err := f1.Eval(nil, nil)
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c.Assert(err, IsNil)
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s1, ok := r1.(string)
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c.Assert(ok, Equals, true)
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c.Assert(s, Equals, s1)
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}
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errTbl := []struct {
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str interface{}
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pos interface{}
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len interface{}
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result string
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}{
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{1, 5, -1, "ratically"},
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{"foobarbar", "4", -1, "barbar"},
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{"Quadratically", 5, "6", "ratica"},
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}
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for _, v := range errTbl {
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f := FunctionSubstring{
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StrExpr: &Value{Val: v.str},
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Pos: &Value{Val: v.pos},
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}
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if v.len != -1 {
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f.Len = &Value{Val: v.len}
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}
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_, err := f.Eval(nil, nil)
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c.Assert(err, NotNil)
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}
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}
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