func processSingleExactMatcher(file io.Reader, matcher streammatch.Matcher, needBuffer bool) ([]matchRecord, error) {
var reader io.Reader
if needBuffer {
reader = bufio.NewReaderSize(file, defaultBufSize)
} else {
reader = file
}
linereader := streammatch.NewLineReader(reader)
lineOffset := 0
line := 0
lastLineMatches := 0
matches := make([]matchRecord, 0, 2)
matcher.Reset()
for {
pos, err := matcher.FindMatch(linereader)
if err == nil {
matches = append(matches, matchRecord{line: line, lineOffset: lineOffset, linepos: pos})
} else if err == streammatch.EOL {
newLineOffset := linereader.BytesRead()
lastLineSize := newLineOffset - lineOffset
for i := lastLineMatches; i < len(matches); i++ {
matches[i].lineSize = lastLineSize
}
lastLineMatches = len(matches)
line++
lineOffset = newLineOffset
matcher.Reset()
} else if err == io.EOF {
newLineOffset := linereader.BytesRead()
lastLineSize := newLineOffset - lineOffset
for i := lastLineMatches; i < len(matches); i++ {
matches[i].lineSize = lastLineSize
matches[i].isLastLine = true
}
return matches, nil
} else {
return matches, err
}
}
}
func processMultiExactMatcher(file io.Reader, matcher streammatch.MultiMatcher) ([]matchRecord, error) {
reader := bufio.NewReader(file)
linereader := streammatch.NewLineReader(reader)
lineOffset := 0
line := 0
lastLineMatches := 0
matches := make([]matchRecord, 0, 2)
matcher.Reset()
for {
pos, ptrns, err := matcher.FindMultipleMatches(linereader)
if err == nil {
for _, ptrn := range ptrns {
matches = append(matches, matchRecord{line: line, lineOffset: lineOffset, linepos: pos, patternindex: ptrn})
}
} else if err == streammatch.EOL {
newLineOffset := linereader.BytesRead()
lastLineSize := newLineOffset - lineOffset
for i := lastLineMatches; i < len(matches); i++ {
matches[i].lineSize = lastLineSize
}
lastLineMatches = len(matches)
line++
lineOffset = newLineOffset
matcher.Reset()
} else if err == io.EOF {
newLineOffset := linereader.BytesRead()
lastLineSize := newLineOffset - lineOffset
for i := lastLineMatches; i < len(matches); i++ {
matches[i].lineSize = lastLineSize
matches[i].isLastLine = true
}
return matches, nil
} else {
return matches, err
}
}
}