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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 util contains nogo-related utilities.
package util
import (
"fmt"
"io/ioutil"
"regexp"
"strconv"
"strings"
)
// findingRegexp is used to parse findings.
var findingRegexp = regexp.MustCompile(`([a-zA-Z0-9_\/\.-]+): (-|([a-zA-Z0-9_\/\.-]+):([0-9]+)(:([0-9]+))?): (.*)`)
const (
categoryIndex = 1
fullPathAndLineIndex = 2
fullPathIndex = 3
lineIndex = 4
messageIndex = 7
)
// Finding is a single finding.
type Finding struct {
Category string
Path string
Line int
Message string
}
// ExtractFindingsFromFile loads findings from a file.
func ExtractFindingsFromFile(filename string) ([]Finding, error) {
content, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
return ExtractFindingsFromBytes(content)
}
// ExtractFindingsFromBytes loads findings from bytes.
func ExtractFindingsFromBytes(content []byte) (findings []Finding, err error) {
lines := strings.Split(string(content), "\n")
for _, singleLine := range lines {
// Skip blank lines.
singleLine = strings.TrimSpace(singleLine)
if singleLine == "" {
continue
}
m := findingRegexp.FindStringSubmatch(singleLine)
if m == nil {
// We shouldn't see findings like this.
return findings, fmt.Errorf("poorly formated line: %v", singleLine)
}
if m[fullPathAndLineIndex] == "-" {
continue // No source file available.
}
// Cleanup the message.
message := m[messageIndex]
message = strings.Replace(message, " → ", "\n → ", -1)
message = strings.Replace(message, " or ", "\n or ", -1)
// Construct a new annotation.
lineNumber, _ := strconv.ParseUint(m[lineIndex], 10, 32)
findings = append(findings, Finding{
Category: m[categoryIndex],
Path: m[fullPathIndex],
Line: int(lineNumber),
Message: message,
})
}
return findings, nil
}
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