| // Copyright 2016 The Go Authors. All rights reserved. | |
| // Use of this source code is governed by a BSD-style | |
| // license that can be found in the LICENSE file. | |
| package syntax | |
| type Token uint | |
| type token = Token | |
| //go:generate stringer -type token -linecomment tokens.go | |
| const ( | |
| _ token = iota | |
| _EOF // EOF | |
| // names and literals | |
| _Name // name | |
| _Literal // literal | |
| // operators and operations | |
| // _Operator is excluding '*' (_Star) | |
| _Operator // op | |
| _AssignOp // op= | |
| _IncOp // opop | |
| _Assign // = | |
| _Define // := | |
| _Arrow // <- | |
| _Star // * | |
| // delimiters | |
| _Lparen // ( | |
| _Lbrack // [ | |
| _Lbrace // { | |
| _Rparen // ) | |
| _Rbrack // ] | |
| _Rbrace // } | |
| _Comma // , | |
| _Semi // ; | |
| _Colon // : | |
| _Dot // . | |
| _DotDotDot // ... | |
| // keywords | |
| _Break // break | |
| _Case // case | |
| _Chan // chan | |
| _Const // const | |
| _Continue // continue | |
| _Default // default | |
| _Defer // defer | |
| _Else // else | |
| _Fallthrough // fallthrough | |
| _For // for | |
| _Func // func | |
| _Go // go | |
| _Goto // goto | |
| _If // if | |
| _Import // import | |
| _Interface // interface | |
| _Map // map | |
| _Package // package | |
| _Range // range | |
| _Return // return | |
| _Select // select | |
| _Struct // struct | |
| _Switch // switch | |
| _Type // type | |
| _Var // var | |
| // empty line comment to exclude it from .String | |
| tokenCount // | |
| ) | |
| const ( | |
| // for BranchStmt | |
| Break = _Break | |
| Continue = _Continue | |
| Fallthrough = _Fallthrough | |
| Goto = _Goto | |
| // for CallStmt | |
| Go = _Go | |
| Defer = _Defer | |
| ) | |
| // Make sure we have at most 64 tokens so we can use them in a set. | |
| const _ uint64 = 1 << (tokenCount - 1) | |
| // contains reports whether tok is in tokset. | |
| func contains(tokset uint64, tok token) bool { | |
| return tokset&(1<<tok) != 0 | |
| } | |
| type LitKind uint8 | |
| // TODO(gri) With the 'i' (imaginary) suffix now permitted on integer | |
| // and floating-point numbers, having a single ImagLit does | |
| // not represent the literal kind well anymore. Remove it? | |
| const ( | |
| IntLit LitKind = iota | |
| FloatLit | |
| ImagLit | |
| RuneLit | |
| StringLit | |
| ) | |
| type Operator uint | |
| //go:generate stringer -type Operator -linecomment tokens.go | |
| const ( | |
| _ Operator = iota | |
| // Def is the : in := | |
| Def // : | |
| Not // ! | |
| Recv // <- | |
| Tilde // ~ | |
| // precOrOr | |
| OrOr // || | |
| // precAndAnd | |
| AndAnd // && | |
| // precCmp | |
| Eql // == | |
| Neq // != | |
| Lss // < | |
| Leq // <= | |
| Gtr // > | |
| Geq // >= | |
| // precAdd | |
| Add // + | |
| Sub // - | |
| Or // | | |
| Xor // ^ | |
| // precMul | |
| Mul // * | |
| Div // / | |
| Rem // % | |
| And // & | |
| AndNot // &^ | |
| Shl // << | |
| Shr // >> | |
| ) | |
| // Operator precedences | |
| const ( | |
| _ = iota | |
| precOrOr | |
| precAndAnd | |
| precCmp | |
| precAdd | |
| precMul | |
| ) | |