// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package syntax
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type token uint
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//go:generate stringer -type token -linecomment
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const (
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_ token = iota
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_EOF // EOF
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// names and literals
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_Name // name
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_Literal // literal
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// operators and operations
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// _Operator is excluding '*' (_Star)
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_Operator // op
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_AssignOp // op=
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_IncOp // opop
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_Assign // =
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_Define // :=
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_Arrow // <-
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_Star // *
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// delimiters
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_Lparen // (
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_Lbrack // [
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_Lbrace // {
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_Rparen // )
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_Rbrack // ]
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_Rbrace // }
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_Comma // ,
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_Semi // ;
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_Colon // :
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_Dot // .
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_DotDotDot // ...
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// keywords
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_Break // break
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_Case // case
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_Chan // chan
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_Const // const
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_Continue // continue
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_Default // default
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_Defer // defer
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_Else // else
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_Fallthrough // fallthrough
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_For // for
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_Func // func
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_Go // go
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_Goto // goto
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_If // if
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_Import // import
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_Interface // interface
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_Map // map
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_Package // package
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_Range // range
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_Return // return
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_Select // select
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_Struct // struct
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_Switch // switch
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_Type // type
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_Var // var
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// empty line comment to exclude it from .String
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tokenCount //
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)
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const (
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// for BranchStmt
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Break = _Break
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Continue = _Continue
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Fallthrough = _Fallthrough
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Goto = _Goto
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// for CallStmt
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Go = _Go
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Defer = _Defer
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)
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// Make sure we have at most 64 tokens so we can use them in a set.
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const _ uint64 = 1 << (tokenCount - 1)
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// contains reports whether tok is in tokset.
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func contains(tokset uint64, tok token) bool {
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return tokset&(1<<tok) != 0
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}
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type LitKind uint
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const (
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IntLit LitKind = iota
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FloatLit
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ImagLit
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RuneLit
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StringLit
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)
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type Operator uint
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//go:generate stringer -type Operator -linecomment
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const (
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_ Operator = iota
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// Def is the : in :=
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Def // :
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Not // !
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Recv // <-
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// precOrOr
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OrOr // ||
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// precAndAnd
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AndAnd // &&
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// precCmp
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Eql // ==
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Neq // !=
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Lss // <
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Leq // <=
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Gtr // >
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Geq // >=
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// precAdd
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Add // +
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Sub // -
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Or // |
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Xor // ^
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// precMul
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Mul // *
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Div // /
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Rem // %
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And // &
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AndNot // &^
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Shl // <<
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Shr // >>
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)
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// Operator precedences
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const (
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_ = iota
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precOrOr
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precAndAnd
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precCmp
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precAdd
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precMul
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)
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