mirror of
https://github.com/golang/go
synced 2024-10-01 03:28:32 -06:00
go/expect: add marker support for go.mod files
This change adds some basic marker support for go.mod files inside of go/expect. It requires all markers to be of the form "//@mark()", where mark can be anything. It is the same format as .go files, only difference is that it needs to have "//" since that is the only comment marker that go.mod files recognize. Updates golang/go#36091 Change-Id: Ib9e325e01020181b8cee1c1be6bb257726ce913d Reviewed-on: https://go-review.googlesource.com/c/tools/+/216838 Run-TryBot: Rohan Challa <rohan@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rebecca Stambler <rstambler@golang.org>
This commit is contained in:
parent
b4fe758a9b
commit
97da75b46c
@ -56,6 +56,7 @@ import (
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"bytes"
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"fmt"
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"go/token"
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"path/filepath"
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"regexp"
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)
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@ -89,12 +90,20 @@ func MatchBefore(fset *token.FileSet, readFile ReadFile, end token.Pos, pattern
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return token.NoPos, token.NoPos, fmt.Errorf("invalid file: %v", err)
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}
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position := f.Position(end)
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startOffset := f.Offset(lineStart(f, position.Line))
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startOffset := f.Offset(f.LineStart(position.Line))
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endOffset := f.Offset(end)
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line := content[startOffset:endOffset]
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matchStart, matchEnd := -1, -1
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switch pattern := pattern.(type) {
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case string:
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// If the file is a go.mod and we are matching // indirect, then we
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// need to look for it on the line after the current line.
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// TODO(golang/go#36894): have a more intuitive approach for // indirect
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if filepath.Ext(f.Name()) == ".mod" && pattern == "// indirect" {
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startOffset = f.Offset(f.LineStart(position.Line + 1))
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endOffset = f.Offset(lineEnd(f, position.Line+1))
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line = content[startOffset:endOffset]
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}
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bytePattern := []byte(pattern)
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matchStart = bytes.Index(line, bytePattern)
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if matchStart >= 0 {
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@ -118,32 +127,9 @@ func MatchBefore(fset *token.FileSet, readFile ReadFile, end token.Pos, pattern
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return f.Pos(startOffset + matchStart), f.Pos(startOffset + matchEnd), nil
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}
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// this functionality was borrowed from the analysisutil package
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func lineStart(f *token.File, line int) token.Pos {
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// Use binary search to find the start offset of this line.
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//
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// TODO(adonovan): eventually replace this function with the
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// simpler and more efficient (*go/token.File).LineStart, added
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// in go1.12.
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min := 0 // inclusive
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max := f.Size() // exclusive
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for {
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offset := (min + max) / 2
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pos := f.Pos(offset)
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posn := f.Position(pos)
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if posn.Line == line {
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return pos - (token.Pos(posn.Column) - 1)
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}
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if min+1 >= max {
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return token.NoPos
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}
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if posn.Line < line {
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min = offset
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} else {
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max = offset
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}
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func lineEnd(f *token.File, line int) token.Pos {
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if line >= f.LineCount() {
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return token.Pos(f.Size() + 1)
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}
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return f.LineStart(line + 1)
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}
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@ -14,102 +14,127 @@ import (
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)
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func TestMarker(t *testing.T) {
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const filename = "testdata/test.go"
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content, err := ioutil.ReadFile(filename)
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if err != nil {
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t.Fatal(err)
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}
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for _, tt := range []struct {
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filename string
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expectNotes int
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expectMarkers map[string]string
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expectChecks map[string][]interface{}
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}{
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{
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filename: "testdata/test.go",
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expectNotes: 13,
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expectMarkers: map[string]string{
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"αSimpleMarker": "α",
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"OffsetMarker": "β",
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"RegexMarker": "γ",
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"εMultiple": "ε",
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"ζMarkers": "ζ",
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"ηBlockMarker": "η",
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"Declared": "η",
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"Comment": "ι",
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"LineComment": "someFunc",
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"NonIdentifier": "+",
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"StringMarker": "\"hello\"",
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},
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expectChecks: map[string][]interface{}{
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"αSimpleMarker": nil,
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"StringAndInt": []interface{}{"Number %d", int64(12)},
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"Bool": []interface{}{true},
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},
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},
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{
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filename: "testdata/go.mod",
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expectNotes: 3,
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expectMarkers: map[string]string{
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"αMarker": "αfake1α",
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"IndirectMarker": "// indirect",
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"βMarker": "require golang.org/modfile v0.0.0",
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},
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},
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} {
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t.Run(tt.filename, func(t *testing.T) {
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content, err := ioutil.ReadFile(tt.filename)
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if err != nil {
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t.Fatal(err)
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}
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readFile := func(string) ([]byte, error) { return content, nil }
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const expectNotes = 13
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expectMarkers := map[string]string{
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"αSimpleMarker": "α",
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"OffsetMarker": "β",
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"RegexMarker": "γ",
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"εMultiple": "ε",
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"ζMarkers": "ζ",
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"ηBlockMarker": "η",
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"Declared": "η",
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"Comment": "ι",
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"LineComment": "someFunc",
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"NonIdentifier": "+",
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"StringMarker": "\"hello\"",
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}
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expectChecks := map[string][]interface{}{
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"αSimpleMarker": nil,
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"StringAndInt": []interface{}{"Number %d", int64(12)},
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"Bool": []interface{}{true},
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}
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readFile := func(string) ([]byte, error) { return content, nil }
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markers := make(map[string]token.Pos)
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for name, tok := range expectMarkers {
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offset := bytes.Index(content, []byte(tok))
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markers[name] = token.Pos(offset + 1)
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end := bytes.Index(content[offset:], []byte(tok))
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if end > 0 {
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markers[name+"@"] = token.Pos(offset + end + 2)
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}
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}
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fset := token.NewFileSet()
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notes, err := expect.Parse(fset, filename, nil)
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if err != nil {
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t.Fatalf("Failed to extract notes: %v", err)
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}
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if len(notes) != expectNotes {
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t.Errorf("Expected %v notes, got %v", expectNotes, len(notes))
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}
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for _, n := range notes {
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switch {
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case n.Args == nil:
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// A //@foo note associates the name foo with the position of the
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// first match of "foo" on the current line.
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checkMarker(t, fset, readFile, markers, n.Pos, n.Name, n.Name)
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case n.Name == "mark":
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// A //@mark(name, "pattern") note associates the specified name
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// with the position on the first match of pattern on the current line.
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if len(n.Args) != 2 {
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t.Errorf("%v: expected 2 args to mark, got %v", fset.Position(n.Pos), len(n.Args))
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continue
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}
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ident, ok := n.Args[0].(expect.Identifier)
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if !ok {
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t.Errorf("%v: identifier, got %T", fset.Position(n.Pos), n.Args[0])
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continue
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}
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checkMarker(t, fset, readFile, markers, n.Pos, string(ident), n.Args[1])
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case n.Name == "check":
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// A //@check(args, ...) note specifies some hypothetical action to
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// be taken by the test driver and its expected outcome.
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// In this test, the action is to compare the arguments
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// against expectChecks.
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if len(n.Args) < 1 {
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t.Errorf("%v: expected 1 args to check, got %v", fset.Position(n.Pos), len(n.Args))
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continue
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}
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ident, ok := n.Args[0].(expect.Identifier)
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if !ok {
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t.Errorf("%v: identifier, got %T", fset.Position(n.Pos), n.Args[0])
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continue
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}
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args, ok := expectChecks[string(ident)]
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if !ok {
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t.Errorf("%v: unexpected check %v", fset.Position(n.Pos), ident)
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continue
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}
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if len(n.Args) != len(args)+1 {
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t.Errorf("%v: expected %v args to check, got %v", fset.Position(n.Pos), len(args)+1, len(n.Args))
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continue
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}
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for i, got := range n.Args[1:] {
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if args[i] != got {
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t.Errorf("%v: arg %d expected %v, got %v", fset.Position(n.Pos), i, args[i], got)
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markers := make(map[string]token.Pos)
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for name, tok := range tt.expectMarkers {
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offset := bytes.Index(content, []byte(tok))
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// Handle special case where we look for // indirect and we
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// need to search the next line.
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if tok == "// indirect" {
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offset = bytes.Index(content, []byte(" "+tok)) + 1
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}
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markers[name] = token.Pos(offset + 1)
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end := bytes.Index(content[offset:], []byte(tok))
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if end > 0 {
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markers[name+"@"] = token.Pos(offset + end + 2)
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}
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}
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default:
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t.Errorf("Unexpected note %v at %v", n.Name, fset.Position(n.Pos))
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}
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fset := token.NewFileSet()
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notes, err := expect.Parse(fset, tt.filename, content)
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if err != nil {
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t.Fatalf("Failed to extract notes: %v", err)
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}
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if len(notes) != tt.expectNotes {
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t.Errorf("Expected %v notes, got %v", tt.expectNotes, len(notes))
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}
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for _, n := range notes {
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switch {
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case n.Args == nil:
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// A //@foo note associates the name foo with the position of the
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// first match of "foo" on the current line.
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checkMarker(t, fset, readFile, markers, n.Pos, n.Name, n.Name)
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case n.Name == "mark":
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// A //@mark(name, "pattern") note associates the specified name
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// with the position on the first match of pattern on the current line.
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if len(n.Args) != 2 {
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t.Errorf("%v: expected 2 args to mark, got %v", fset.Position(n.Pos), len(n.Args))
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continue
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}
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ident, ok := n.Args[0].(expect.Identifier)
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if !ok {
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t.Errorf("%v: identifier, got %T", fset.Position(n.Pos), n.Args[0])
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continue
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}
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checkMarker(t, fset, readFile, markers, n.Pos, string(ident), n.Args[1])
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case n.Name == "check":
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// A //@check(args, ...) note specifies some hypothetical action to
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// be taken by the test driver and its expected outcome.
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// In this test, the action is to compare the arguments
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// against expectChecks.
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if len(n.Args) < 1 {
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t.Errorf("%v: expected 1 args to check, got %v", fset.Position(n.Pos), len(n.Args))
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continue
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}
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ident, ok := n.Args[0].(expect.Identifier)
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if !ok {
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t.Errorf("%v: identifier, got %T", fset.Position(n.Pos), n.Args[0])
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continue
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}
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args, ok := tt.expectChecks[string(ident)]
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if !ok {
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t.Errorf("%v: unexpected check %v", fset.Position(n.Pos), ident)
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continue
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}
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if len(n.Args) != len(args)+1 {
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t.Errorf("%v: expected %v args to check, got %v", fset.Position(n.Pos), len(args)+1, len(n.Args))
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continue
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}
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for i, got := range n.Args[1:] {
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if args[i] != got {
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t.Errorf("%v: arg %d expected %v, got %v", fset.Position(n.Pos), i, args[i], got)
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}
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}
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default:
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t.Errorf("Unexpected note %v at %v", n.Name, fset.Position(n.Pos))
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}
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}
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})
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}
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}
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@ -9,15 +9,17 @@ import (
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"go/ast"
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"go/parser"
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"go/token"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"text/scanner"
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"golang.org/x/mod/modfile"
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)
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const (
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commentStart = "@"
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)
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const commentStart = "@"
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const commentStartLen = len(commentStart)
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// Identifier is the type for an identifier in an Note argument list.
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type Identifier string
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@ -34,52 +36,62 @@ func Parse(fset *token.FileSet, filename string, content []byte) ([]*Note, error
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if content != nil {
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src = content
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}
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// TODO: We should write this in terms of the scanner.
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// there are ways you can break the parser such that it will not add all the
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// comments to the ast, which may result in files where the tests are silently
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// not run.
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file, err := parser.ParseFile(fset, filename, src, parser.ParseComments)
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if file == nil {
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return nil, err
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switch filepath.Ext(filename) {
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case ".go":
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// TODO: We should write this in terms of the scanner.
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// there are ways you can break the parser such that it will not add all the
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// comments to the ast, which may result in files where the tests are silently
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// not run.
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file, err := parser.ParseFile(fset, filename, src, parser.ParseComments)
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if file == nil {
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return nil, err
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}
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return ExtractGo(fset, file)
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case ".mod":
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file, err := modfile.Parse(filename, content, nil)
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if err != nil {
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return nil, err
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}
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fset.AddFile(filename, -1, len(content)).SetLinesForContent(content)
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return extractMod(fset, file)
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}
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return Extract(fset, file)
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return nil, nil
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}
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// Extract collects all the notes present in an AST.
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// extractMod collects all the notes present in a go.mod file.
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// Each comment whose text starts with @ is parsed as a comma-separated
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// sequence of notes.
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// See the package documentation for details about the syntax of those
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// notes.
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func Extract(fset *token.FileSet, file *ast.File) ([]*Note, error) {
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// Only allow notes to appear with the following format: "//@mark()" or // @mark()
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func extractMod(fset *token.FileSet, file *modfile.File) ([]*Note, error) {
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var notes []*Note
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for _, g := range file.Comments {
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for _, c := range g.List {
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text := c.Text
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if strings.HasPrefix(text, "/*") {
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text = strings.TrimSuffix(text, "*/")
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}
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text = text[2:] // remove "//" or "/*" prefix
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// Allow notes to appear within comments.
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// For example:
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// "// //@mark()" is valid.
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// "// @mark()" is not valid.
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// "// /*@mark()*/" is not valid.
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var adjust int
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if i := strings.Index(text, commentStart); i > 2 {
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// Get the text before the commentStart.
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pre := text[i-2 : i]
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if pre != "//" {
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continue
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}
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text = text[i:]
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adjust = i
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}
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if !strings.HasPrefix(text, commentStart) {
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for _, stmt := range file.Syntax.Stmt {
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comment := stmt.Comment()
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if comment == nil {
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continue
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}
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// Handle the case for markers of `// indirect` to be on the line before
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// the require statement.
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// TODO(golang/go#36894): have a more intuitive approach for // indirect
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for _, cmt := range comment.Before {
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text, adjust := getAdjustedNote(cmt.Token)
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if text == "" {
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continue
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}
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text = text[len(commentStart):]
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parsed, err := parse(fset, token.Pos(int(c.Pos())+4+adjust), text)
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parsed, err := parse(fset, token.Pos(int(cmt.Start.Byte)+adjust), text)
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if err != nil {
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return nil, err
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}
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notes = append(notes, parsed...)
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}
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// Handle the normal case for markers on the same line.
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for _, cmt := range comment.Suffix {
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text, adjust := getAdjustedNote(cmt.Token)
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if text == "" {
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continue
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}
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parsed, err := parse(fset, token.Pos(int(cmt.Start.Byte)+adjust), text)
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if err != nil {
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return nil, err
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}
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@ -89,6 +101,57 @@ func Extract(fset *token.FileSet, file *ast.File) ([]*Note, error) {
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return notes, nil
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}
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|
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// ExtractGo collects all the notes present in an AST.
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// Each comment whose text starts with @ is parsed as a comma-separated
|
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// sequence of notes.
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// See the package documentation for details about the syntax of those
|
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// notes.
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func ExtractGo(fset *token.FileSet, file *ast.File) ([]*Note, error) {
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var notes []*Note
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for _, g := range file.Comments {
|
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for _, c := range g.List {
|
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text, adjust := getAdjustedNote(c.Text)
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if text == "" {
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continue
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}
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parsed, err := parse(fset, token.Pos(int(c.Pos())+adjust), text)
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if err != nil {
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return nil, err
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}
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notes = append(notes, parsed...)
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}
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}
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return notes, nil
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}
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func getAdjustedNote(text string) (string, int) {
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if strings.HasPrefix(text, "/*") {
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text = strings.TrimSuffix(text, "*/")
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}
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text = text[2:] // remove "//" or "/*" prefix
|
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|
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// Allow notes to appear within comments.
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// For example:
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// "// //@mark()" is valid.
|
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// "// @mark()" is not valid.
|
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// "// /*@mark()*/" is not valid.
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var adjust int
|
||||
if i := strings.Index(text, commentStart); i > 2 {
|
||||
// Get the text before the commentStart.
|
||||
pre := text[i-2 : i]
|
||||
if pre != "//" {
|
||||
return "", 0
|
||||
}
|
||||
text = text[i:]
|
||||
adjust = i
|
||||
}
|
||||
if !strings.HasPrefix(text, commentStart) {
|
||||
return "", 0
|
||||
}
|
||||
text = text[commentStartLen:]
|
||||
return text, commentStartLen + adjust + 1
|
||||
}
|
||||
|
||||
const invalidToken rune = 0
|
||||
|
||||
type tokens struct {
|
||||
|
7
go/expect/testdata/go.mod
vendored
Normal file
7
go/expect/testdata/go.mod
vendored
Normal file
@ -0,0 +1,7 @@
|
||||
module αfake1α //@mark(αMarker, "αfake1α")
|
||||
|
||||
go 1.14
|
||||
|
||||
require golang.org/modfile v0.0.0 //@mark(βMarker, "require golang.org/modfile v0.0.0")
|
||||
//@mark(IndirectMarker, "// indirect")
|
||||
require golang.org/x/tools v0.0.0-20191219192050-56b0b28a00f7 // indirect
|
@ -50,7 +50,7 @@ func TestObjValueLookup(t *testing.T) {
|
||||
// Each note of the form @ssa(x, "BinOp") in testdata/objlookup.go
|
||||
// specifies an expectation that an object named x declared on the
|
||||
// same line is associated with an an ssa.Value of type *ssa.BinOp.
|
||||
notes, err := expect.Extract(conf.Fset, f)
|
||||
notes, err := expect.ExtractGo(conf.Fset, f)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
@ -271,7 +271,7 @@ func testValueForExpr(t *testing.T, testfile string) {
|
||||
return true
|
||||
})
|
||||
|
||||
notes, err := expect.Extract(prog.Fset, f)
|
||||
notes, err := expect.ExtractGo(prog.Fset, f)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user