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