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// Copyright 2013 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 oracle
import (
"fmt"
"go/ast"
"go/token"
"code.google.com/p/go.tools/go/types"
"code.google.com/p/go.tools/oracle/serial"
)
// definition reports the location of the definition of an identifier.
//
// TODO(adonovan): opt: for intra-file references, the parser's
// resolution might be enough; we should start with that.
//
func definition(o *Oracle, qpos *QueryPos) (queryResult, error) {
id, _ := qpos.path[0].(*ast.Ident)
if id == nil {
return nil, fmt.Errorf("no identifier here")
}
obj := qpos.info.ObjectOf(id)
if obj == nil {
// Happens for y in "switch y := x.(type)", but I think that's all.
return nil, fmt.Errorf("no object for identifier")
}
return &definitionResult{qpos, obj}, nil
}
type definitionResult struct {
qpos *QueryPos
obj types.Object // object it denotes
}
func (r *definitionResult) display(printf printfFunc) {
printf(r.obj, "defined here as %s", r.qpos.ObjectString(r.obj))
}
func (r *definitionResult) toSerial(res *serial.Result, fset *token.FileSet) {
definition := &serial.Definition{
Desc: r.obj.String(),
}
if pos := r.obj.Pos(); pos != token.NoPos { // Package objects have no Pos()
definition.ObjPos = fset.Position(pos).String()
}
res.Definition = definition
}
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