1 files changed, 156 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/syntax/tokens.go b/src/cmd/compile/internal/syntax/tokens.go
new file mode 100644
index 0000000..3b97cb6
--- /dev/null
+++ b/src/cmd/compile/internal/syntax/tokens.go
@@ -0,0 +1,156 @@
+// 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
+
+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
+
+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
+)