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4ad5537bfa
This change accepts the 'i' suffix on binary and octal integer literals as well as hexadecimal floats. The suffix was already accepted on decimal integers and floats. Note that 0123i == 123i for backward-compatibility (and 09i is valid). See also the respective language in the spec change: https://golang.org/cl/161098 Change-Id: I9d2d755cba36a3fa7b9e24308c73754d4568daaf Reviewed-on: https://go-review.googlesource.com/c/162878 Run-TryBot: Robert Griesemer <gri@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
156 lines
2.6 KiB
Go
156 lines
2.6 KiB
Go
// 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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// TODO(gri) With the 'i' (imaginary) suffix now permitted on integer
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// and floating-point numbers, having a single ImagLit does
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// not represent the literal kind well anymore. Remove it?
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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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