ast_typeparams.go

Documentation: go/ast

     1  // Copyright 2021 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build typeparams
     6  // +build typeparams
     7  
     8  package ast
     9  
    10  import "go/token"
    11  
    12  type (
    13  	// A FuncType node represents a function type.
    14  	FuncType struct {
    15  		Func    token.Pos  // position of "func" keyword (token.NoPos if there is no "func")
    16  		TParams *FieldList // type parameters; or nil
    17  		Params  *FieldList // (incoming) parameters; non-nil
    18  		Results *FieldList // (outgoing) results; or nil
    19  	}
    20  
    21  	// A TypeSpec node represents a type declaration (TypeSpec production).
    22  	TypeSpec struct {
    23  		Doc     *CommentGroup // associated documentation; or nil
    24  		Name    *Ident        // type name
    25  		TParams *FieldList    // type parameters; or nil
    26  		Assign  token.Pos     // position of '=', if any
    27  		Type    Expr          // *Ident, *ParenExpr, *SelectorExpr, *StarExpr, or any of the *XxxTypes
    28  		Comment *CommentGroup // line comments; or nil
    29  	}
    30  
    31  	// A ListExpr node represents a list of expressions separated by commas.
    32  	// ListExpr nodes are used as index in IndexExpr nodes representing type
    33  	// or function instantiations with more than one type argument.
    34  	ListExpr struct {
    35  		ElemList []Expr
    36  	}
    37  )
    38  
    39  func (*ListExpr) exprNode() {}
    40  func (x *ListExpr) Pos() token.Pos {
    41  	if len(x.ElemList) > 0 {
    42  		return x.ElemList[0].Pos()
    43  	}
    44  	return token.NoPos
    45  }
    46  func (x *ListExpr) End() token.Pos {
    47  	if len(x.ElemList) > 0 {
    48  		return x.ElemList[len(x.ElemList)-1].End()
    49  	}
    50  	return token.NoPos
    51  }
    52
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