162 lines
4.0 KiB
Go
162 lines
4.0 KiB
Go
// Copyright 2019 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package nogo
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import (
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"go/token"
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"regexp"
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"strings"
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"golang.org/x/tools/go/analysis"
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)
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type matcher interface {
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ShouldReport(d analysis.Diagnostic, fs *token.FileSet) bool
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}
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// pathRegexps filters explicit paths.
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type pathRegexps struct {
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expr []*regexp.Regexp
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// include, if true, indicates that paths matching any regexp in expr
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// match.
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//
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// If false, paths matching no regexps in expr match.
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include bool
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}
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// buildRegexps builds a list of regular expressions.
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//
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// This will panic on error.
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func buildRegexps(prefix string, args ...string) []*regexp.Regexp {
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result := make([]*regexp.Regexp, 0, len(args))
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for _, arg := range args {
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result = append(result, regexp.MustCompile(prefix+arg))
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}
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return result
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}
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// notPath works around the lack of backtracking.
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//
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// It is used to construct a regular expression for non-matching components.
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func notPath(name string) string {
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sb := strings.Builder{}
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sb.WriteString("(")
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for i := range name {
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if i > 0 {
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sb.WriteString("|")
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}
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sb.WriteString(name[:i])
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sb.WriteString("[^")
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sb.WriteByte(name[i])
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sb.WriteString("/][^/]*")
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}
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sb.WriteString(")")
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return sb.String()
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}
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// ShouldReport implements matcher.ShouldReport.
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func (p *pathRegexps) ShouldReport(d analysis.Diagnostic, fs *token.FileSet) bool {
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fullPos := fs.Position(d.Pos).String()
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for _, path := range p.expr {
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if path.MatchString(fullPos) {
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return p.include
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}
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}
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return !p.include
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}
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// internalExcluded excludes specific internal paths.
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func internalExcluded(paths ...string) *pathRegexps {
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return &pathRegexps{
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expr: buildRegexps(internalPrefix, paths...),
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include: false,
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}
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}
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// excludedExcluded excludes specific external paths.
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func externalExcluded(paths ...string) *pathRegexps {
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return &pathRegexps{
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expr: buildRegexps(externalPrefix, paths...),
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include: false,
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}
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}
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// internalMatches returns a path matcher for internal packages.
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func internalMatches() *pathRegexps {
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return &pathRegexps{
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expr: buildRegexps(internalPrefix, internalDefault),
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include: true,
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}
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}
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// resultExcluded excludes explicit message contents.
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type resultExcluded []string
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// ShouldReport implements matcher.ShouldReport.
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func (r resultExcluded) ShouldReport(d analysis.Diagnostic, _ *token.FileSet) bool {
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for _, str := range r {
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if strings.Contains(d.Message, str) {
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return false
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}
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}
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return true // Not excluded.
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}
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// andMatcher is a composite matcher.
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type andMatcher struct {
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first matcher
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second matcher
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}
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// ShouldReport implements matcher.ShouldReport.
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func (a *andMatcher) ShouldReport(d analysis.Diagnostic, fs *token.FileSet) bool {
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return a.first.ShouldReport(d, fs) && a.second.ShouldReport(d, fs)
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}
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// and is a syntactic convension for andMatcher.
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func and(first matcher, second matcher) *andMatcher {
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return &andMatcher{
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first: first,
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second: second,
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}
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}
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// anyMatcher matches everything.
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type anyMatcher struct{}
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// ShouldReport implements matcher.ShouldReport.
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func (anyMatcher) ShouldReport(analysis.Diagnostic, *token.FileSet) bool {
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return true
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}
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// alwaysMatches returns an anyMatcher instance.
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func alwaysMatches() anyMatcher {
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return anyMatcher{}
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}
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// neverMatcher will never match.
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type neverMatcher struct{}
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// ShouldReport implements matcher.ShouldReport.
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func (neverMatcher) ShouldReport(analysis.Diagnostic, *token.FileSet) bool {
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return false
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}
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// disableMatches returns a neverMatcher instance.
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func disableMatches() neverMatcher {
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return neverMatcher{}
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}
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