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author | Robert Griesemer <gri@golang.org> | 2020-10-19 15:47:40 -0700 |
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committer | Robert Griesemer <gri@golang.org> | 2020-10-20 00:18:18 +0000 |
commit | 6ff16fe3ee46f8e35c18226d04bd38a396eb4175 (patch) | |
tree | 01ed42190c96a02b62cb6725fe432b44ef6316b6 /src/cmd/compile/internal/syntax/testing.go | |
parent | 5e46c6a10f578333d9ba3f9aa2e4a0d3adb196a4 (diff) | |
download | go-6ff16fe3ee46f8e35c18226d04bd38a396eb4175.tar.gz go-6ff16fe3ee46f8e35c18226d04bd38a396eb4175.zip |
[dev.typeparams] cmd/compile/internal/syntax: add utility functions for testing
Preparation step for types2 package.
Change-Id: I8f9557b1a48ad570ba38aac7b720e639218dc6a7
Reviewed-on: https://go-review.googlesource.com/c/go/+/263623
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Diffstat (limited to 'src/cmd/compile/internal/syntax/testing.go')
-rw-r--r-- | src/cmd/compile/internal/syntax/testing.go | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/syntax/testing.go b/src/cmd/compile/internal/syntax/testing.go new file mode 100644 index 0000000000..3e02dc1c5d --- /dev/null +++ b/src/cmd/compile/internal/syntax/testing.go @@ -0,0 +1,72 @@ +// Copyright 2020 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. + +// This file implements testing support. + +package syntax + +import ( + "io" + "regexp" + "strings" +) + +// CommentsDo parses the given source and calls the provided handler for each +// comment or error. If the text provided to handler starts with a '/' it is +// the comment text; otherwise it is the error message. +func CommentsDo(src io.Reader, handler func(line, col uint, text string)) { + var s scanner + s.init(src, handler, comments) + for s.tok != _EOF { + s.next() + } +} + +// ERROR comments must start with text `ERROR "msg"` or `ERROR msg`. +// Space around "msg" or msg is ignored. +var errRx = regexp.MustCompile(`^ *ERROR *"?([^"]*)"?`) + +// ErrorMap collects all comments with comment text of the form +// `ERROR "msg"` or `ERROR msg` from the given src and returns them +// as []Error lists in a map indexed by line number. The position +// for each Error is the position of the token immediately preceding +// the comment, the Error message is the message msg extracted from +// the comment, with all errors that are on the same line collected +// in a slice. If there is no preceding token (the `ERROR` comment +// appears in the beginning of the file), then the recorded position +// is unknown (line, col = 0, 0). If there are no ERROR comments, the +// result is nil. +func ErrorMap(src io.Reader) (errmap map[uint][]Error) { + // position of previous token + var base *PosBase + var prev struct{ line, col uint } + + var s scanner + s.init(src, func(_, _ uint, text string) { + if text[0] != '/' { + return // error, ignore + } + if text[1] == '*' { + text = text[:len(text)-2] // strip trailing */ + } + if s := errRx.FindStringSubmatch(text[2:]); len(s) == 2 { + pos := MakePos(base, prev.line, prev.col) + err := Error{pos, strings.TrimSpace(s[1])} + if errmap == nil { + errmap = make(map[uint][]Error) + } + errmap[prev.line] = append(errmap[prev.line], err) + } + }, comments) + + for s.tok != _EOF { + s.next() + if s.tok == _Semi && s.lit != "semicolon" { + continue // ignore automatically inserted semicolons + } + prev.line, prev.col = s.line, s.col + } + + return +} |