| // 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 |
| |
| //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 // <- |
| |
| // 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 |
| ) |
