op.go

Documentation: cuelang.org/go/internal/core/adt

     1  // Copyright 2018 The CUE Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package adt
    16  
    17  import "cuelang.org/go/cue/token"
    18  
    19  // Op indicates the operation at the top of an expression tree of the expression
    20  // use to evaluate a value.
    21  type Op int
    22  
    23  func (o Op) String() string {
    24  	return opToString[o]
    25  }
    26  
    27  // Values of Op.
    28  const (
    29  	NoOp Op = iota
    30  
    31  	AndOp
    32  	OrOp
    33  
    34  	SelectorOp
    35  	IndexOp
    36  	SliceOp
    37  	CallOp
    38  
    39  	BoolAndOp
    40  	BoolOrOp
    41  
    42  	EqualOp
    43  	NotOp
    44  	NotEqualOp
    45  	LessThanOp
    46  	LessEqualOp
    47  	GreaterThanOp
    48  	GreaterEqualOp
    49  
    50  	MatchOp
    51  	NotMatchOp
    52  
    53  	AddOp
    54  	SubtractOp
    55  	MultiplyOp
    56  	FloatQuotientOp
    57  	IntQuotientOp
    58  	IntRemainderOp
    59  	IntDivideOp
    60  	IntModuloOp
    61  
    62  	InterpolationOp
    63  )
    64  
    65  var opToString = map[Op]string{
    66  	AndOp:           "&",
    67  	OrOp:            "|",
    68  	BoolAndOp:       "&&",
    69  	BoolOrOp:        "||",
    70  	EqualOp:         "==",
    71  	NotOp:           "!",
    72  	NotEqualOp:      "!=",
    73  	LessThanOp:      "<",
    74  	LessEqualOp:     "<=",
    75  	GreaterThanOp:   ">",
    76  	GreaterEqualOp:  ">=",
    77  	MatchOp:         "=~",
    78  	NotMatchOp:      "!~",
    79  	AddOp:           "+",
    80  	SubtractOp:      "-",
    81  	MultiplyOp:      "*",
    82  	FloatQuotientOp: "/",
    83  	IntQuotientOp:   "quo",
    84  	IntRemainderOp:  "rem",
    85  	IntDivideOp:     "div",
    86  	IntModuloOp:     "mod",
    87  
    88  	SelectorOp: ".",
    89  	IndexOp:    "[]",
    90  	SliceOp:    "[:]",
    91  	CallOp:     "()",
    92  
    93  	InterpolationOp: `\()`,
    94  }
    95  
    96  // OpFromToken converts a token.Token to an Op.
    97  func OpFromToken(t token.Token) Op {
    98  	return tokenMap[t]
    99  }
   100  
   101  // Token returns the token.Token corresponding to the Op.
   102  func (op Op) Token() token.Token {
   103  	return opMap[op]
   104  }
   105  
   106  var tokenMap = map[token.Token]Op{
   107  	token.OR:  OrOp,  // |
   108  	token.AND: AndOp, // &
   109  
   110  	token.ADD: AddOp,           // +
   111  	token.SUB: SubtractOp,      // -
   112  	token.MUL: MultiplyOp,      // *
   113  	token.QUO: FloatQuotientOp, // /
   114  
   115  	token.IDIV: IntDivideOp,    // div
   116  	token.IMOD: IntModuloOp,    // mod
   117  	token.IQUO: IntQuotientOp,  // quo
   118  	token.IREM: IntRemainderOp, // rem
   119  
   120  	token.LAND: BoolAndOp, // &&
   121  	token.LOR:  BoolOrOp,  // ||
   122  
   123  	token.EQL: EqualOp,       // ==
   124  	token.LSS: LessThanOp,    // <
   125  	token.GTR: GreaterThanOp, // >
   126  	token.NOT: NotOp,         // !
   127  
   128  	token.NEQ:  NotEqualOp,     // !=
   129  	token.LEQ:  LessEqualOp,    // <=
   130  	token.GEQ:  GreaterEqualOp, // >=
   131  	token.MAT:  MatchOp,        // =~
   132  	token.NMAT: NotMatchOp,     // !~
   133  }
   134  
   135  var opMap = map[Op]token.Token{}
   136  
   137  func init() {
   138  	for t, o := range tokenMap {
   139  		opMap[o] = t
   140  	}
   141  }
   142
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