Source file src/pkg/cmd/compile/internal/syntax/tokens.go

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

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