77 lines
1.7 KiB
Go
77 lines
1.7 KiB
Go
// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package oracle
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import (
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"fmt"
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"go/ast"
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"go/token"
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"golang.org/x/tools/go/loader"
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"golang.org/x/tools/go/types"
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"golang.org/x/tools/oracle/serial"
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)
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// definition reports the location of the definition of an identifier.
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//
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// TODO(adonovan): opt: for intra-file references, the parser's
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// resolution might be enough; we should start with that.
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//
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func definition(q *Query) error {
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lconf := loader.Config{Build: q.Build}
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allowErrors(&lconf)
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if err := importQueryPackage(q.Pos, &lconf); err != nil {
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return err
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}
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// Load/parse/type-check the program.
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lprog, err := lconf.Load()
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if err != nil {
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return err
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}
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q.Fset = lprog.Fset
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qpos, err := parseQueryPos(lprog, q.Pos, false)
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if err != nil {
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return err
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}
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id, _ := qpos.path[0].(*ast.Ident)
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if id == nil {
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return fmt.Errorf("no identifier here")
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}
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obj := qpos.info.ObjectOf(id)
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if obj == nil {
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// Happens for y in "switch y := x.(type)",
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// and the package declaration,
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// but I think that's all.
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return fmt.Errorf("no object for identifier")
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}
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q.result = &definitionResult{qpos, obj}
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return nil
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}
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type definitionResult struct {
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qpos *queryPos
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obj types.Object // object it denotes
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}
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func (r *definitionResult) display(printf printfFunc) {
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printf(r.obj, "defined here as %s", r.qpos.objectString(r.obj))
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}
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func (r *definitionResult) toSerial(res *serial.Result, fset *token.FileSet) {
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definition := &serial.Definition{
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Desc: r.obj.String(),
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}
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if pos := r.obj.Pos(); pos != token.NoPos { // Package objects have no Pos()
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definition.ObjPos = fset.Position(pos).String()
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}
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res.Definition = definition
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}
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