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6ff16fe3ee
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>
72 lines
2.2 KiB
Go
72 lines
2.2 KiB
Go
// Copyright 2020 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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// This file implements testing support.
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package syntax
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import (
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"io"
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"regexp"
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"strings"
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)
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// CommentsDo parses the given source and calls the provided handler for each
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// comment or error. If the text provided to handler starts with a '/' it is
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// the comment text; otherwise it is the error message.
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func CommentsDo(src io.Reader, handler func(line, col uint, text string)) {
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var s scanner
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s.init(src, handler, comments)
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for s.tok != _EOF {
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s.next()
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}
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}
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// ERROR comments must start with text `ERROR "msg"` or `ERROR msg`.
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// Space around "msg" or msg is ignored.
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var errRx = regexp.MustCompile(`^ *ERROR *"?([^"]*)"?`)
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// ErrorMap collects all comments with comment text of the form
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// `ERROR "msg"` or `ERROR msg` from the given src and returns them
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// as []Error lists in a map indexed by line number. The position
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// for each Error is the position of the token immediately preceding
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// the comment, the Error message is the message msg extracted from
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// the comment, with all errors that are on the same line collected
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// in a slice. If there is no preceding token (the `ERROR` comment
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// appears in the beginning of the file), then the recorded position
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// is unknown (line, col = 0, 0). If there are no ERROR comments, the
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// result is nil.
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func ErrorMap(src io.Reader) (errmap map[uint][]Error) {
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// position of previous token
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var base *PosBase
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var prev struct{ line, col uint }
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var s scanner
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s.init(src, func(_, _ uint, text string) {
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if text[0] != '/' {
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return // error, ignore
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}
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if text[1] == '*' {
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text = text[:len(text)-2] // strip trailing */
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}
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if s := errRx.FindStringSubmatch(text[2:]); len(s) == 2 {
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pos := MakePos(base, prev.line, prev.col)
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err := Error{pos, strings.TrimSpace(s[1])}
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if errmap == nil {
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errmap = make(map[uint][]Error)
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}
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errmap[prev.line] = append(errmap[prev.line], err)
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}
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}, comments)
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for s.tok != _EOF {
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s.next()
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if s.tok == _Semi && s.lit != "semicolon" {
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continue // ignore automatically inserted semicolons
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}
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prev.line, prev.col = s.line, s.col
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}
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return
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}
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