github.com/bir3/gocompiler@v0.9.2202/src/cmd/compile/internal/syntax/tokens.go (about)

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package syntax
     6  
     7  type Token uint
     8  
     9  type token = Token
    10  
    11  //go:generate stringer -type token -linecomment tokens.go
    12  
    13  const (
    14  	_    token = iota
    15  	_EOF       // EOF
    16  
    17  	// names and literals
    18  	_Name    // name
    19  	_Literal // literal
    20  
    21  	// operators and operations
    22  	// _Operator is excluding '*' (_Star)
    23  	_Operator // op
    24  	_AssignOp // op=
    25  	_IncOp    // opop
    26  	_Assign   // =
    27  	_Define   // :=
    28  	_Arrow    // <-
    29  	_Star     // *
    30  
    31  	// delimiters
    32  	_Lparen    // (
    33  	_Lbrack    // [
    34  	_Lbrace    // {
    35  	_Rparen    // )
    36  	_Rbrack    // ]
    37  	_Rbrace    // }
    38  	_Comma     // ,
    39  	_Semi      // ;
    40  	_Colon     // :
    41  	_Dot       // .
    42  	_DotDotDot // ...
    43  
    44  	// keywords
    45  	_Break       // break
    46  	_Case        // case
    47  	_Chan        // chan
    48  	_Const       // const
    49  	_Continue    // continue
    50  	_Default     // default
    51  	_Defer       // defer
    52  	_Else        // else
    53  	_Fallthrough // fallthrough
    54  	_For         // for
    55  	_Func        // func
    56  	_Go          // go
    57  	_Goto        // goto
    58  	_If          // if
    59  	_Import      // import
    60  	_Interface   // interface
    61  	_Map         // map
    62  	_Package     // package
    63  	_Range       // range
    64  	_Return      // return
    65  	_Select      // select
    66  	_Struct      // struct
    67  	_Switch      // switch
    68  	_Type        // type
    69  	_Var         // var
    70  
    71  	// empty line comment to exclude it from .String
    72  	tokenCount //
    73  )
    74  
    75  const (
    76  	// for BranchStmt
    77  	Break       = _Break
    78  	Continue    = _Continue
    79  	Fallthrough = _Fallthrough
    80  	Goto        = _Goto
    81  
    82  	// for CallStmt
    83  	Go    = _Go
    84  	Defer = _Defer
    85  )
    86  
    87  // Make sure we have at most 64 tokens so we can use them in a set.
    88  const _ uint64 = 1 << (tokenCount - 1)
    89  
    90  // contains reports whether tok is in tokset.
    91  func contains(tokset uint64, tok token) bool {
    92  	return tokset&(1<<tok) != 0
    93  }
    94  
    95  type LitKind uint8
    96  
    97  // TODO(gri) With the 'i' (imaginary) suffix now permitted on integer
    98  // and floating-point numbers, having a single ImagLit does
    99  // not represent the literal kind well anymore. Remove it?
   100  const (
   101  	IntLit LitKind = iota
   102  	FloatLit
   103  	ImagLit
   104  	RuneLit
   105  	StringLit
   106  )
   107  
   108  type Operator uint
   109  
   110  //go:generate stringer -type Operator -linecomment tokens.go
   111  
   112  const (
   113  	_ Operator = iota
   114  
   115  	// Def is the : in :=
   116  	Def   // :
   117  	Not   // !
   118  	Recv  // <-
   119  	Tilde // ~
   120  
   121  	// precOrOr
   122  	OrOr // ||
   123  
   124  	// precAndAnd
   125  	AndAnd // &&
   126  
   127  	// precCmp
   128  	Eql // ==
   129  	Neq // !=
   130  	Lss // <
   131  	Leq // <=
   132  	Gtr // >
   133  	Geq // >=
   134  
   135  	// precAdd
   136  	Add // +
   137  	Sub // -
   138  	Or  // |
   139  	Xor // ^
   140  
   141  	// precMul
   142  	Mul    // *
   143  	Div    // /
   144  	Rem    // %
   145  	And    // &
   146  	AndNot // &^
   147  	Shl    // <<
   148  	Shr    // >>
   149  )
   150  
   151  // Operator precedences
   152  const (
   153  	_ = iota
   154  	precOrOr
   155  	precAndAnd
   156  	precCmp
   157  	precAdd
   158  	precMul
   159  )