// reduceScope is called for one-shot queries that need only a single
// typed package. It attempts to guess the query package from pos and
// reduce the analysis scope (set of loaded packages) to just that one
// plus (the exported parts of) its dependencies. It leaves its
// arguments unchanged on failure.
//
// TODO(adonovan): this is a real mess... but it's fast.
//
func reduceScope(pos string, impcfg *importer.Config, args *[]string) {
// TODO(adonovan): make the 'args' argument of
// (*Importer).LoadInitialPackages part of the
// importer.Config, and inline LoadInitialPackages into
// NewImporter. Then we won't need the 'args' argument.
fqpos, err := fastQueryPos(pos)
if err != nil {
return // bad query
}
// TODO(adonovan): fix: this gives the wrong results for files
// in non-importable packages such as tests and ad-hoc packages
// specified as a list of files (incl. the oracle's tests).
_, importPath, err := guessImportPath(fqpos.fset.File(fqpos.start).Name(), impcfg.Build)
if err != nil {
return // can't find GOPATH dir
}
if importPath == "" {
return
}
// Check that it's possible to load the queried package.
// (e.g. oracle tests contain different 'package' decls in same dir.)
// Keep consistent with logic in importer/util.go!
ctxt2 := *impcfg.Build
ctxt2.CgoEnabled = false
bp, err := ctxt2.Import(importPath, "", 0)
if err != nil {
return // no files for package
}
_ = bp
// TODO(adonovan): fix: also check that the queried file appears in the package.
// for _, f := range bp.GoFiles, bp.TestGoFiles, bp.XTestGoFiles {
// if sameFile(f, fqpos.filename) { goto found }
// }
// return // not found
// found:
impcfg.TypeCheckFuncBodies = func(p string) bool { return p == importPath }
*args = []string{importPath}
}
