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opcode.go
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opcode.go
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// Copyright 2015 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package opcode
import (
"fmt"
"io"
)
// Op is opcode type.
type Op int
// List operators.
const (
LogicAnd Op = iota + 1
LeftShift
RightShift
LogicOr
GE
LE
EQ
NE
LT
GT
Plus
Minus
And
Or
Mod
Xor
Div
Mul
Not
BitNeg
IntDiv
LogicXor
NullEQ
In
Like
Case
Regexp
IsNull
IsTruth
IsFalsity
)
// Ops maps opcode to string.
var Ops = map[Op]string{
LogicAnd: "and",
LogicOr: "or",
LogicXor: "xor",
LeftShift: "leftshift",
RightShift: "rightshift",
GE: "ge",
LE: "le",
EQ: "eq",
NE: "ne",
LT: "lt",
GT: "gt",
Plus: "plus",
Minus: "minus",
And: "bitand",
Or: "bitor",
Mod: "mod",
Xor: "bitxor",
Div: "div",
Mul: "mul",
Not: "not",
BitNeg: "bitneg",
IntDiv: "intdiv",
NullEQ: "nulleq",
In: "in",
Like: "like",
Case: "case",
Regexp: "regexp",
IsNull: "isnull",
IsTruth: "istrue",
IsFalsity: "isfalse",
}
// String implements Stringer interface.
func (o Op) String() string {
str, ok := Ops[o]
if !ok {
panic(fmt.Sprintf("%d", o))
}
return str
}
var opsLiteral = map[Op]string{
LogicAnd: "&&",
LogicOr: "||",
LogicXor: "^",
LeftShift: "<<",
RightShift: ">>",
GE: ">=",
LE: "<=",
EQ: "==",
NE: "!=",
LT: "<",
GT: ">",
Plus: "+",
Minus: "-",
And: "&",
Or: "|",
Mod: "%",
Xor: "^",
Div: "/",
Mul: "*",
Not: "!",
BitNeg: "~",
IntDiv: "DIV",
NullEQ: "<=>",
In: "IN",
Like: "LIKE",
Case: "CASE",
Regexp: "REGEXP",
IsNull: "IS NULL",
IsTruth: "IS TRUE",
IsFalsity: "IS FALSE",
}
// Format the ExprNode into a Writer.
func (o Op) Format(w io.Writer) {
fmt.Fprintf(w, "%s", opsLiteral[o])
}