// expectedErrors collects the regular expressions of ERROR comments
// found in the package files of pkg and returns them in sorted order
// (by filename and position).
func expectedErrors(t *testing.T, pkg *ast.Package) (list scanner.ErrorList) {
// scan all package files
for filename := range pkg.Files {
src, err := ioutil.ReadFile(filename)
if err != nil {
t.Fatalf("expectedErrors(%s): %v", pkg.Name, err)
}
var s scanner.Scanner
file := fset.AddFile(filename, fset.Base(), len(src))
s.Init(file, src, nil, scanner.ScanComments)
var prev token.Pos // position of last non-comment token
loop:
for {
pos, tok, lit := s.Scan()
switch tok {
case token.EOF:
break loop
case token.COMMENT:
s := errRx.FindStringSubmatch(lit)
if len(s) == 2 {
list = append(list, &scanner.Error{fset.Position(prev), string(s[1])})
}
default:
prev = pos
}
}
}
sort.Sort(list) // multiple files may not be sorted
return
}
// expectedErrors collects the regular expressions of ERROR comments found
// in files and returns them as a map of error positions to error messages.
//
func expectedErrors(t *testing.T, testname string, files map[string]*ast.File) map[token.Pos]string {
errors := make(map[token.Pos]string)
for filename := range files {
src, err := ioutil.ReadFile(filename)
if err != nil {
t.Fatalf("%s: could not read %s", testname, filename)
}
var s scanner.Scanner
// file was parsed already - do not add it again to the file
// set otherwise the position information returned here will
// not match the position information collected by the parser
s.Init(getFile(filename), src, nil, scanner.ScanComments)
var prev token.Pos // position of last non-comment token
scanFile:
for {
pos, tok, lit := s.Scan()
switch tok {
case token.EOF:
break scanFile
case token.COMMENT:
s := errRx.FindStringSubmatch(lit)
if len(s) == 2 {
errors[prev] = string(s[1])
}
default:
prev = pos
}
}
}
return errors
}