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encoding/csv: add FieldPos method
This enables a consumer of a CSV to find out the position of a CSV field without implementing an intermediate buffer. This is useful to produce good higher level error messages when the CSV syntax is OK but the field values don't match expectations. This also changes the existing semantics of the `ParseError.Column` field to bring it in line with precedent elsewhere in the Go standard library (notably go/token.Position) - the column is now 1-based and indicates a byte count rather than a rune count, and the error position reporting at the end of a last line without a newline is now fixed. This change has some impact on performance: ``` name old time/op new time/op delta Read-8 2.14µs ± 0% 2.15µs ± 0% ~ (p=0.056 n=5+5) ReadWithFieldsPerRecord-8 2.15µs ± 2% 2.15µs ± 1% ~ (p=0.151 n=5+5) ReadWithoutFieldsPerRecord-8 2.15µs ± 0% 2.15µs ± 0% +0.37% (p=0.024 n=5+5) ReadLargeFields-8 3.55µs ± 2% 3.59µs ± 0% ~ (p=0.206 n=5+5) ReadReuseRecord-8 1.18µs ± 1% 1.22µs ± 1% +2.93% (p=0.008 n=5+5) ReadReuseRecordWithFieldsPerRecord-8 1.18µs ± 0% 1.21µs ± 0% +2.54% (p=0.008 n=5+5) ReadReuseRecordWithoutFieldsPerRecord-8 1.18µs ± 0% 1.22µs ± 1% +3.66% (p=0.008 n=5+5) ReadReuseRecordLargeFields-8 2.53µs ± 1% 2.57µs ± 1% +1.70% (p=0.008 n=5+5) Write-8 1.02µs ± 1% 1.01µs ± 0% -1.18% (p=0.016 n=5+4) ``` Fixes #44221. Change-Id: Id37c50fc396024eef406c5bad45380ecd414f5ea Reviewed-on: https://go-review.googlesource.com/c/go/+/291290 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Trust: Paul Jolly <paul@myitcv.org.uk>
This commit is contained in:
Roger Peppe
roger peppe
parent
2c05ba4ae0
commit
6d95e5a4ff
@ -66,7 +66,7 @@ import (
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type ParseError struct {
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StartLine int // Line where the record starts
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Line int // Line where the error occurred
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Column int // Column (rune index) where the error occurred
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Column int // Column (1-based byte index) where the error occurred
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Err error // The actual error
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}
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@ -162,6 +162,10 @@ type Reader struct {
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// The i'th field ends at offset fieldIndexes[i] in recordBuffer.
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fieldIndexes []int
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// fieldPositions is an index of field positions for the
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// last record returned by Read.
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fieldPositions []position
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// lastRecord is a record cache and only used when ReuseRecord == true.
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lastRecord []string
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}
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@ -192,6 +196,25 @@ func (r *Reader) Read() (record []string, err error) {
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return record, err
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}
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// FieldPos returns the line and column corresponding to
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// the start of the field with the given index in the slice most recently
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// returned by Read. Numbering of lines and columns starts at 1;
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// columns are counted in bytes, not runes.
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//
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// If this is called with an out-of-bounds index, it panics.
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func (r *Reader) FieldPos(field int) (line, column int) {
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if field < 0 || field >= len(r.fieldPositions) {
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panic("out of range index passed to FieldPos")
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}
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p := &r.fieldPositions[field]
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return p.line, p.col
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}
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// pos holds the position of a field in the current line.
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type position struct {
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line, col int
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}
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// ReadAll reads all the remaining records from r.
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// Each record is a slice of fields.
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// A successful call returns err == nil, not err == io.EOF. Because ReadAll is
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@ -260,7 +283,7 @@ func (r *Reader) readRecord(dst []string) ([]string, error) {
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}
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// Read line (automatically skipping past empty lines and any comments).
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var line, fullLine []byte
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var line []byte
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var errRead error
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for errRead == nil {
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line, errRead = r.readLine()
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@ -272,7 +295,6 @@ func (r *Reader) readRecord(dst []string) ([]string, error) {
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line = nil
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continue // Skip empty lines
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}
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fullLine = line
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break
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}
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if errRead == io.EOF {
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@ -286,10 +308,20 @@ func (r *Reader) readRecord(dst []string) ([]string, error) {
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recLine := r.numLine // Starting line for record
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r.recordBuffer = r.recordBuffer[:0]
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r.fieldIndexes = r.fieldIndexes[:0]
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r.fieldPositions = r.fieldPositions[:0]
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pos := position{line: r.numLine, col: 1}
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parseField:
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for {
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if r.TrimLeadingSpace {
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line = bytes.TrimLeftFunc(line, unicode.IsSpace)
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i := bytes.IndexFunc(line, func(r rune) bool {
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return !unicode.IsSpace(r)
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})
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if i < 0 {
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i = len(line)
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pos.col -= lengthNL(line)
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}
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line = line[i:]
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pos.col += i
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}
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if len(line) == 0 || line[0] != '"' {
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// Non-quoted string field
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@ -303,48 +335,56 @@ parseField:
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// Check to make sure a quote does not appear in field.
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if !r.LazyQuotes {
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if j := bytes.IndexByte(field, '"'); j >= 0 {
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col := utf8.RuneCount(fullLine[:len(fullLine)-len(line[j:])])
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col := pos.col + j
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err = &ParseError{StartLine: recLine, Line: r.numLine, Column: col, Err: ErrBareQuote}
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break parseField
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}
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}
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r.recordBuffer = append(r.recordBuffer, field...)
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r.fieldIndexes = append(r.fieldIndexes, len(r.recordBuffer))
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r.fieldPositions = append(r.fieldPositions, pos)
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if i >= 0 {
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line = line[i+commaLen:]
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pos.col += i + commaLen
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continue parseField
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}
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break parseField
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} else {
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// Quoted string field
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fieldPos := pos
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line = line[quoteLen:]
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pos.col += quoteLen
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for {
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i := bytes.IndexByte(line, '"')
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if i >= 0 {
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// Hit next quote.
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r.recordBuffer = append(r.recordBuffer, line[:i]...)
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line = line[i+quoteLen:]
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pos.col += i + quoteLen
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switch rn := nextRune(line); {
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case rn == '"':
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// `""` sequence (append quote).
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r.recordBuffer = append(r.recordBuffer, '"')
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line = line[quoteLen:]
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pos.col += quoteLen
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case rn == r.Comma:
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// `",` sequence (end of field).
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line = line[commaLen:]
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pos.col += commaLen
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r.fieldIndexes = append(r.fieldIndexes, len(r.recordBuffer))
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r.fieldPositions = append(r.fieldPositions, fieldPos)
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continue parseField
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case lengthNL(line) == len(line):
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// `"\n` sequence (end of line).
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r.fieldIndexes = append(r.fieldIndexes, len(r.recordBuffer))
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r.fieldPositions = append(r.fieldPositions, fieldPos)
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break parseField
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case r.LazyQuotes:
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// `"` sequence (bare quote).
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r.recordBuffer = append(r.recordBuffer, '"')
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default:
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// `"*` sequence (invalid non-escaped quote).
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col := utf8.RuneCount(fullLine[:len(fullLine)-len(line)-quoteLen])
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err = &ParseError{StartLine: recLine, Line: r.numLine, Column: col, Err: ErrQuote}
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err = &ParseError{StartLine: recLine, Line: r.numLine, Column: pos.col - quoteLen, Err: ErrQuote}
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break parseField
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}
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} else if len(line) > 0 {
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@ -353,19 +393,23 @@ parseField:
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if errRead != nil {
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break parseField
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}
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pos.col += len(line)
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line, errRead = r.readLine()
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if len(line) > 0 {
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pos.line++
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pos.col = 1
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}
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if errRead == io.EOF {
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errRead = nil
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}
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fullLine = line
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} else {
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// Abrupt end of file (EOF or error).
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if !r.LazyQuotes && errRead == nil {
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col := utf8.RuneCount(fullLine)
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err = &ParseError{StartLine: recLine, Line: r.numLine, Column: col, Err: ErrQuote}
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err = &ParseError{StartLine: recLine, Line: pos.line, Column: pos.col, Err: ErrQuote}
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break parseField
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}
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r.fieldIndexes = append(r.fieldIndexes, len(r.recordBuffer))
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r.fieldPositions = append(r.fieldPositions, fieldPos)
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break parseField
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}
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}
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@ -392,7 +436,12 @@ parseField:
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// Check or update the expected fields per record.
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if r.FieldsPerRecord > 0 {
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if len(dst) != r.FieldsPerRecord && err == nil {
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err = &ParseError{StartLine: recLine, Line: recLine, Err: ErrFieldCount}
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err = &ParseError{
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StartLine: recLine,
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Line: recLine,
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Column: 1,
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Err: ErrFieldCount,
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}
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}
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} else if r.FieldsPerRecord == 0 {
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r.FieldsPerRecord = len(dst)
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@ -5,6 +5,8 @@
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package csv
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import (
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"errors"
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"fmt"
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"io"
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"reflect"
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"strings"
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@ -12,405 +14,544 @@ import (
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"unicode/utf8"
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)
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func TestRead(t *testing.T) {
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tests := []struct {
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Name string
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Input string
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Output [][]string
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Error error
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type readTest struct {
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Name string
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Input string
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Output [][]string
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Positions [][][2]int
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Errors []error
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// These fields are copied into the Reader
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Comma rune
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Comment rune
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UseFieldsPerRecord bool // false (default) means FieldsPerRecord is -1
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FieldsPerRecord int
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LazyQuotes bool
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TrimLeadingSpace bool
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ReuseRecord bool
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}{{
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Name: "Simple",
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Input: "a,b,c\n",
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Output: [][]string{{"a", "b", "c"}},
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}, {
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Name: "CRLF",
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Input: "a,b\r\nc,d\r\n",
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Output: [][]string{{"a", "b"}, {"c", "d"}},
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}, {
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Name: "BareCR",
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Input: "a,b\rc,d\r\n",
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Output: [][]string{{"a", "b\rc", "d"}},
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}, {
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Name: "RFC4180test",
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Input: `#field1,field2,field3
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"aaa","bb
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b","ccc"
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"a,a","b""bb","ccc"
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zzz,yyy,xxx
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// These fields are copied into the Reader
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Comma rune
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Comment rune
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UseFieldsPerRecord bool // false (default) means FieldsPerRecord is -1
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FieldsPerRecord int
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LazyQuotes bool
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TrimLeadingSpace bool
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ReuseRecord bool
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}
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// In these tests, the §, ¶ and ∑ characters in readTest.Input are used to denote
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// the start of a field, a record boundary and the position of an error respectively.
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// They are removed before parsing and are used to verify the position
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// information reported by FieldPos.
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var readTests = []readTest{{
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Name: "Simple",
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Input: "§a,§b,§c\n",
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Output: [][]string{{"a", "b", "c"}},
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}, {
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Name: "CRLF",
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Input: "§a,§b\r\n¶§c,§d\r\n",
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Output: [][]string{{"a", "b"}, {"c", "d"}},
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}, {
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Name: "BareCR",
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Input: "§a,§b\rc,§d\r\n",
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Output: [][]string{{"a", "b\rc", "d"}},
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}, {
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Name: "RFC4180test",
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Input: `§#field1,§field2,§field3
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¶§"aaa",§"bb
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b",§"ccc"
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¶§"a,a",§"b""bb",§"ccc"
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¶§zzz,§yyy,§xxx
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`,
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Output: [][]string{
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{"#field1", "field2", "field3"},
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{"aaa", "bb\nb", "ccc"},
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{"a,a", `b"bb`, "ccc"},
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{"zzz", "yyy", "xxx"},
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},
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UseFieldsPerRecord: true,
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FieldsPerRecord: 0,
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}, {
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Name: "NoEOLTest",
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Input: "a,b,c",
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Output: [][]string{{"a", "b", "c"}},
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}, {
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Name: "Semicolon",
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Input: "a;b;c\n",
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Output: [][]string{{"a", "b", "c"}},
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Comma: ';',
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}, {
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Name: "MultiLine",
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Input: `"two
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line","one line","three
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Output: [][]string{
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{"#field1", "field2", "field3"},
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{"aaa", "bb\nb", "ccc"},
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{"a,a", `b"bb`, "ccc"},
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{"zzz", "yyy", "xxx"},
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},
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UseFieldsPerRecord: true,
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FieldsPerRecord: 0,
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}, {
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Name: "NoEOLTest",
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Input: "§a,§b,§c",
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Output: [][]string{{"a", "b", "c"}},
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}, {
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Name: "Semicolon",
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Input: "§a;§b;§c\n",
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Output: [][]string{{"a", "b", "c"}},
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Comma: ';',
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}, {
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Name: "MultiLine",
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Input: `§"two
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line",§"one line",§"three
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line
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field"`,
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Output: [][]string{{"two\nline", "one line", "three\nline\nfield"}},
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}, {
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Name: "BlankLine",
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Input: "a,b,c\n\nd,e,f\n\n",
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Output: [][]string{
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{"a", "b", "c"},
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{"d", "e", "f"},
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},
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}, {
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Name: "BlankLineFieldCount",
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Input: "a,b,c\n\nd,e,f\n\n",
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Output: [][]string{
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{"a", "b", "c"},
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{"d", "e", "f"},
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},
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UseFieldsPerRecord: true,
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FieldsPerRecord: 0,
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}, {
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Name: "TrimSpace",
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Input: " a, b, c\n",
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Output: [][]string{{"a", "b", "c"}},
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TrimLeadingSpace: true,
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}, {
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Name: "LeadingSpace",
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Input: " a, b, c\n",
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Output: [][]string{{" a", " b", " c"}},
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}, {
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Name: "Comment",
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Input: "#1,2,3\na,b,c\n#comment",
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Output: [][]string{{"a", "b", "c"}},
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Comment: '#',
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}, {
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Name: "NoComment",
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Input: "#1,2,3\na,b,c",
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Output: [][]string{{"#1", "2", "3"}, {"a", "b", "c"}},
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}, {
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Name: "LazyQuotes",
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Input: `a "word","1"2",a","b`,
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Output: [][]string{{`a "word"`, `1"2`, `a"`, `b`}},
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LazyQuotes: true,
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}, {
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Name: "BareQuotes",
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Input: `a "word","1"2",a"`,
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Output: [][]string{{`a "word"`, `1"2`, `a"`}},
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LazyQuotes: true,
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}, {
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Name: "BareDoubleQuotes",
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Input: `a""b,c`,
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Output: [][]string{{`a""b`, `c`}},
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LazyQuotes: true,
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}, {
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Name: "BadDoubleQuotes",
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Input: `a""b,c`,
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Error: &ParseError{StartLine: 1, Line: 1, Column: 1, Err: ErrBareQuote},
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}, {
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Name: "TrimQuote",
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Input: ` "a"," b",c`,
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Output: [][]string{{"a", " b", "c"}},
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TrimLeadingSpace: true,
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}, {
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Name: "BadBareQuote",
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Input: `a "word","b"`,
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Error: &ParseError{StartLine: 1, Line: 1, Column: 2, Err: ErrBareQuote},
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}, {
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Name: "BadTrailingQuote",
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Input: `"a word",b"`,
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Error: &ParseError{StartLine: 1, Line: 1, Column: 10, Err: ErrBareQuote},
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}, {
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Name: "ExtraneousQuote",
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Input: `"a "word","b"`,
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Error: &ParseError{StartLine: 1, Line: 1, Column: 3, Err: ErrQuote},
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}, {
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Name: "BadFieldCount",
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Input: "a,b,c\nd,e",
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Error: &ParseError{StartLine: 2, Line: 2, Err: ErrFieldCount},
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UseFieldsPerRecord: true,
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FieldsPerRecord: 0,
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}, {
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Name: "BadFieldCount1",
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Input: `a,b,c`,
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Error: &ParseError{StartLine: 1, Line: 1, Err: ErrFieldCount},
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UseFieldsPerRecord: true,
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FieldsPerRecord: 2,
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}, {
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Name: "FieldCount",
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Input: "a,b,c\nd,e",
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Output: [][]string{{"a", "b", "c"}, {"d", "e"}},
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}, {
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Name: "TrailingCommaEOF",
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Input: "a,b,c,",
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Output: [][]string{{"a", "b", "c", ""}},
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}, {
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Name: "TrailingCommaEOL",
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Input: "a,b,c,\n",
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Output: [][]string{{"a", "b", "c", ""}},
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}, {
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Name: "TrailingCommaSpaceEOF",
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Input: "a,b,c, ",
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Output: [][]string{{"a", "b", "c", ""}},
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TrimLeadingSpace: true,
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}, {
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Name: "TrailingCommaSpaceEOL",
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Input: "a,b,c, \n",
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Output: [][]string{{"a", "b", "c", ""}},
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TrimLeadingSpace: true,
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}, {
|
||||
Name: "TrailingCommaLine3",
|
||||
Input: "a,b,c\nd,e,f\ng,hi,",
|
||||
Output: [][]string{{"a", "b", "c"}, {"d", "e", "f"}, {"g", "hi", ""}},
|
||||
TrimLeadingSpace: true,
|
||||
}, {
|
||||
Name: "NotTrailingComma3",
|
||||
Input: "a,b,c, \n",
|
||||
Output: [][]string{{"a", "b", "c", " "}},
|
||||
}, {
|
||||
Name: "CommaFieldTest",
|
||||
Input: `x,y,z,w
|
||||
x,y,z,
|
||||
x,y,,
|
||||
x,,,
|
||||
,,,
|
||||
"x","y","z","w"
|
||||
"x","y","z",""
|
||||
"x","y","",""
|
||||
"x","","",""
|
||||
"","","",""
|
||||
Output: [][]string{{"two\nline", "one line", "three\nline\nfield"}},
|
||||
}, {
|
||||
Name: "BlankLine",
|
||||
Input: "§a,§b,§c\n\n¶§d,§e,§f\n\n",
|
||||
Output: [][]string{
|
||||
{"a", "b", "c"},
|
||||
{"d", "e", "f"},
|
||||
},
|
||||
}, {
|
||||
Name: "BlankLineFieldCount",
|
||||
Input: "§a,§b,§c\n\n¶§d,§e,§f\n\n",
|
||||
Output: [][]string{
|
||||
{"a", "b", "c"},
|
||||
{"d", "e", "f"},
|
||||
},
|
||||
UseFieldsPerRecord: true,
|
||||
FieldsPerRecord: 0,
|
||||
}, {
|
||||
Name: "TrimSpace",
|
||||
Input: " §a, §b, §c\n",
|
||||
Output: [][]string{{"a", "b", "c"}},
|
||||
TrimLeadingSpace: true,
|
||||
}, {
|
||||
Name: "LeadingSpace",
|
||||
Input: "§ a,§ b,§ c\n",
|
||||
Output: [][]string{{" a", " b", " c"}},
|
||||
}, {
|
||||
Name: "Comment",
|
||||
Input: "#1,2,3\n§a,§b,§c\n#comment",
|
||||
Output: [][]string{{"a", "b", "c"}},
|
||||
Comment: '#',
|
||||
}, {
|
||||
Name: "NoComment",
|
||||
Input: "§#1,§2,§3\n¶§a,§b,§c",
|
||||
Output: [][]string{{"#1", "2", "3"}, {"a", "b", "c"}},
|
||||
}, {
|
||||
Name: "LazyQuotes",
|
||||
Input: `§a "word",§"1"2",§a",§"b`,
|
||||
Output: [][]string{{`a "word"`, `1"2`, `a"`, `b`}},
|
||||
LazyQuotes: true,
|
||||
}, {
|
||||
Name: "BareQuotes",
|
||||
Input: `§a "word",§"1"2",§a"`,
|
||||
Output: [][]string{{`a "word"`, `1"2`, `a"`}},
|
||||
LazyQuotes: true,
|
||||
}, {
|
||||
Name: "BareDoubleQuotes",
|
||||
Input: `§a""b,§c`,
|
||||
Output: [][]string{{`a""b`, `c`}},
|
||||
LazyQuotes: true,
|
||||
}, {
|
||||
Name: "BadDoubleQuotes",
|
||||
Input: `§a∑""b,c`,
|
||||
Errors: []error{&ParseError{Err: ErrBareQuote}},
|
||||
}, {
|
||||
Name: "TrimQuote",
|
||||
Input: ` §"a",§" b",§c`,
|
||||
Output: [][]string{{"a", " b", "c"}},
|
||||
TrimLeadingSpace: true,
|
||||
}, {
|
||||
Name: "BadBareQuote",
|
||||
Input: `§a ∑"word","b"`,
|
||||
Errors: []error{&ParseError{Err: ErrBareQuote}},
|
||||
}, {
|
||||
Name: "BadTrailingQuote",
|
||||
Input: `§"a word",b∑"`,
|
||||
Errors: []error{&ParseError{Err: ErrBareQuote}},
|
||||
}, {
|
||||
Name: "ExtraneousQuote",
|
||||
Input: `§"a ∑"word","b"`,
|
||||
Errors: []error{&ParseError{Err: ErrQuote}},
|
||||
}, {
|
||||
Name: "BadFieldCount",
|
||||
Input: "§a,§b,§c\n¶∑§d,§e",
|
||||
Errors: []error{nil, &ParseError{Err: ErrFieldCount}},
|
||||
Output: [][]string{{"a", "b", "c"}, {"d", "e"}},
|
||||
UseFieldsPerRecord: true,
|
||||
FieldsPerRecord: 0,
|
||||
}, {
|
||||
Name: "BadFieldCountMultiple",
|
||||
Input: "§a,§b,§c\n¶∑§d,§e\n¶∑§f",
|
||||
Errors: []error{nil, &ParseError{Err: ErrFieldCount}, &ParseError{Err: ErrFieldCount}},
|
||||
Output: [][]string{{"a", "b", "c"}, {"d", "e"}, {"f"}},
|
||||
UseFieldsPerRecord: true,
|
||||
FieldsPerRecord: 0,
|
||||
}, {
|
||||
Name: "BadFieldCount1",
|
||||
Input: `§∑a,§b,§c`,
|
||||
Errors: []error{&ParseError{Err: ErrFieldCount}},
|
||||
Output: [][]string{{"a", "b", "c"}},
|
||||
UseFieldsPerRecord: true,
|
||||
FieldsPerRecord: 2,
|
||||
}, {
|
||||
Name: "FieldCount",
|
||||
Input: "§a,§b,§c\n¶§d,§e",
|
||||
Output: [][]string{{"a", "b", "c"}, {"d", "e"}},
|
||||
}, {
|
||||
Name: "TrailingCommaEOF",
|
||||
Input: "§a,§b,§c,§",
|
||||
Output: [][]string{{"a", "b", "c", ""}},
|
||||
}, {
|
||||
Name: "TrailingCommaEOL",
|
||||
Input: "§a,§b,§c,§\n",
|
||||
Output: [][]string{{"a", "b", "c", ""}},
|
||||
}, {
|
||||
Name: "TrailingCommaSpaceEOF",
|
||||
Input: "§a,§b,§c, §",
|
||||
Output: [][]string{{"a", "b", "c", ""}},
|
||||
TrimLeadingSpace: true,
|
||||
}, {
|
||||
Name: "TrailingCommaSpaceEOL",
|
||||
Input: "§a,§b,§c, §\n",
|
||||
Output: [][]string{{"a", "b", "c", ""}},
|
||||
TrimLeadingSpace: true,
|
||||
}, {
|
||||
Name: "TrailingCommaLine3",
|
||||
Input: "§a,§b,§c\n¶§d,§e,§f\n¶§g,§hi,§",
|
||||
Output: [][]string{{"a", "b", "c"}, {"d", "e", "f"}, {"g", "hi", ""}},
|
||||
TrimLeadingSpace: true,
|
||||
}, {
|
||||
Name: "NotTrailingComma3",
|
||||
Input: "§a,§b,§c,§ \n",
|
||||
Output: [][]string{{"a", "b", "c", " "}},
|
||||
}, {
|
||||
Name: "CommaFieldTest",
|
||||
Input: `§x,§y,§z,§w
|
||||
¶§x,§y,§z,§
|
||||
¶§x,§y,§,§
|
||||
¶§x,§,§,§
|
||||
¶§,§,§,§
|
||||
¶§"x",§"y",§"z",§"w"
|
||||
¶§"x",§"y",§"z",§""
|
||||
¶§"x",§"y",§"",§""
|
||||
¶§"x",§"",§"",§""
|
||||
¶§"",§"",§"",§""
|
||||
`,
|
||||
Output: [][]string{
|
||||
{"x", "y", "z", "w"},
|
||||
{"x", "y", "z", ""},
|
||||
{"x", "y", "", ""},
|
||||
{"x", "", "", ""},
|
||||
{"", "", "", ""},
|
||||
{"x", "y", "z", "w"},
|
||||
{"x", "y", "z", ""},
|
||||
{"x", "y", "", ""},
|
||||
{"x", "", "", ""},
|
||||
{"", "", "", ""},
|
||||
},
|
||||
}, {
|
||||
Name: "TrailingCommaIneffective1",
|
||||
Input: "a,b,\nc,d,e",
|
||||
Output: [][]string{
|
||||
{"a", "b", ""},
|
||||
{"c", "d", "e"},
|
||||
},
|
||||
TrimLeadingSpace: true,
|
||||
}, {
|
||||
Name: "ReadAllReuseRecord",
|
||||
Input: "a,b\nc,d",
|
||||
Output: [][]string{
|
||||
{"a", "b"},
|
||||
{"c", "d"},
|
||||
},
|
||||
ReuseRecord: true,
|
||||
}, {
|
||||
Name: "StartLine1", // Issue 19019
|
||||
Input: "a,\"b\nc\"d,e",
|
||||
Error: &ParseError{StartLine: 1, Line: 2, Column: 1, Err: ErrQuote},
|
||||
}, {
|
||||
Name: "StartLine2",
|
||||
Input: "a,b\n\"d\n\n,e",
|
||||
Error: &ParseError{StartLine: 2, Line: 5, Column: 0, Err: ErrQuote},
|
||||
}, {
|
||||
Name: "CRLFInQuotedField", // Issue 21201
|
||||
Input: "A,\"Hello\r\nHi\",B\r\n",
|
||||
Output: [][]string{
|
||||
{"A", "Hello\nHi", "B"},
|
||||
},
|
||||
}, {
|
||||
Name: "BinaryBlobField", // Issue 19410
|
||||
Input: "x09\x41\xb4\x1c,aktau",
|
||||
Output: [][]string{{"x09A\xb4\x1c", "aktau"}},
|
||||
}, {
|
||||
Name: "TrailingCR",
|
||||
Input: "field1,field2\r",
|
||||
Output: [][]string{{"field1", "field2"}},
|
||||
}, {
|
||||
Name: "QuotedTrailingCR",
|
||||
Input: "\"field\"\r",
|
||||
Output: [][]string{{"field"}},
|
||||
}, {
|
||||
Name: "QuotedTrailingCRCR",
|
||||
Input: "\"field\"\r\r",
|
||||
Error: &ParseError{StartLine: 1, Line: 1, Column: 6, Err: ErrQuote},
|
||||
}, {
|
||||
Name: "FieldCR",
|
||||
Input: "field\rfield\r",
|
||||
Output: [][]string{{"field\rfield"}},
|
||||
}, {
|
||||
Name: "FieldCRCR",
|
||||
Input: "field\r\rfield\r\r",
|
||||
Output: [][]string{{"field\r\rfield\r"}},
|
||||
}, {
|
||||
Name: "FieldCRCRLF",
|
||||
Input: "field\r\r\nfield\r\r\n",
|
||||
Output: [][]string{{"field\r"}, {"field\r"}},
|
||||
}, {
|
||||
Name: "FieldCRCRLFCR",
|
||||
Input: "field\r\r\n\rfield\r\r\n\r",
|
||||
Output: [][]string{{"field\r"}, {"\rfield\r"}},
|
||||
}, {
|
||||
Name: "FieldCRCRLFCRCR",
|
||||
Input: "field\r\r\n\r\rfield\r\r\n\r\r",
|
||||
Output: [][]string{{"field\r"}, {"\r\rfield\r"}, {"\r"}},
|
||||
}, {
|
||||
Name: "MultiFieldCRCRLFCRCR",
|
||||
Input: "field1,field2\r\r\n\r\rfield1,field2\r\r\n\r\r,",
|
||||
Output: [][]string{
|
||||
{"field1", "field2\r"},
|
||||
{"\r\rfield1", "field2\r"},
|
||||
{"\r\r", ""},
|
||||
},
|
||||
}, {
|
||||
Name: "NonASCIICommaAndComment",
|
||||
Input: "a£b,c£ \td,e\n€ comment\n",
|
||||
Output: [][]string{{"a", "b,c", "d,e"}},
|
||||
TrimLeadingSpace: true,
|
||||
Comma: '£',
|
||||
Comment: '€',
|
||||
}, {
|
||||
Name: "NonASCIICommaAndCommentWithQuotes",
|
||||
Input: "a€\" b,\"€ c\nλ comment\n",
|
||||
Output: [][]string{{"a", " b,", " c"}},
|
||||
Comma: '€',
|
||||
Comment: 'λ',
|
||||
}, {
|
||||
// λ and θ start with the same byte.
|
||||
// This tests that the parser doesn't confuse such characters.
|
||||
Name: "NonASCIICommaConfusion",
|
||||
Input: "\"abθcd\"λefθgh",
|
||||
Output: [][]string{{"abθcd", "efθgh"}},
|
||||
Comma: 'λ',
|
||||
Comment: '€',
|
||||
}, {
|
||||
Name: "NonASCIICommentConfusion",
|
||||
Input: "λ\nλ\nθ\nλ\n",
|
||||
Output: [][]string{{"λ"}, {"λ"}, {"λ"}},
|
||||
Comment: 'θ',
|
||||
}, {
|
||||
Name: "QuotedFieldMultipleLF",
|
||||
Input: "\"\n\n\n\n\"",
|
||||
Output: [][]string{{"\n\n\n\n"}},
|
||||
}, {
|
||||
Name: "MultipleCRLF",
|
||||
Input: "\r\n\r\n\r\n\r\n",
|
||||
}, {
|
||||
// The implementation may read each line in several chunks if it doesn't fit entirely
|
||||
// in the read buffer, so we should test the code to handle that condition.
|
||||
Name: "HugeLines",
|
||||
Input: strings.Repeat("#ignore\n", 10000) + strings.Repeat("@", 5000) + "," + strings.Repeat("*", 5000),
|
||||
Output: [][]string{{strings.Repeat("@", 5000), strings.Repeat("*", 5000)}},
|
||||
Comment: '#',
|
||||
}, {
|
||||
Name: "QuoteWithTrailingCRLF",
|
||||
Input: "\"foo\"bar\"\r\n",
|
||||
Error: &ParseError{StartLine: 1, Line: 1, Column: 4, Err: ErrQuote},
|
||||
}, {
|
||||
Name: "LazyQuoteWithTrailingCRLF",
|
||||
Input: "\"foo\"bar\"\r\n",
|
||||
Output: [][]string{{`foo"bar`}},
|
||||
LazyQuotes: true,
|
||||
}, {
|
||||
Name: "DoubleQuoteWithTrailingCRLF",
|
||||
Input: "\"foo\"\"bar\"\r\n",
|
||||
Output: [][]string{{`foo"bar`}},
|
||||
}, {
|
||||
Name: "EvenQuotes",
|
||||
Input: `""""""""`,
|
||||
Output: [][]string{{`"""`}},
|
||||
}, {
|
||||
Name: "OddQuotes",
|
||||
Input: `"""""""`,
|
||||
Error: &ParseError{StartLine: 1, Line: 1, Column: 7, Err: ErrQuote},
|
||||
}, {
|
||||
Name: "LazyOddQuotes",
|
||||
Input: `"""""""`,
|
||||
Output: [][]string{{`"""`}},
|
||||
LazyQuotes: true,
|
||||
}, {
|
||||
Name: "BadComma1",
|
||||
Comma: '\n',
|
||||
Error: errInvalidDelim,
|
||||
}, {
|
||||
Name: "BadComma2",
|
||||
Comma: '\r',
|
||||
Error: errInvalidDelim,
|
||||
}, {
|
||||
Name: "BadComma3",
|
||||
Comma: '"',
|
||||
Error: errInvalidDelim,
|
||||
}, {
|
||||
Name: "BadComma4",
|
||||
Comma: utf8.RuneError,
|
||||
Error: errInvalidDelim,
|
||||
}, {
|
||||
Name: "BadComment1",
|
||||
Comment: '\n',
|
||||
Error: errInvalidDelim,
|
||||
}, {
|
||||
Name: "BadComment2",
|
||||
Comment: '\r',
|
||||
Error: errInvalidDelim,
|
||||
}, {
|
||||
Name: "BadComment3",
|
||||
Comment: utf8.RuneError,
|
||||
Error: errInvalidDelim,
|
||||
}, {
|
||||
Name: "BadCommaComment",
|
||||
Comma: 'X',
|
||||
Comment: 'X',
|
||||
Error: errInvalidDelim,
|
||||
}}
|
||||
Output: [][]string{
|
||||
{"x", "y", "z", "w"},
|
||||
{"x", "y", "z", ""},
|
||||
{"x", "y", "", ""},
|
||||
{"x", "", "", ""},
|
||||
{"", "", "", ""},
|
||||
{"x", "y", "z", "w"},
|
||||
{"x", "y", "z", ""},
|
||||
{"x", "y", "", ""},
|
||||
{"x", "", "", ""},
|
||||
{"", "", "", ""},
|
||||
},
|
||||
}, {
|
||||
Name: "TrailingCommaIneffective1",
|
||||
Input: "§a,§b,§\n¶§c,§d,§e",
|
||||
Output: [][]string{
|
||||
{"a", "b", ""},
|
||||
{"c", "d", "e"},
|
||||
},
|
||||
TrimLeadingSpace: true,
|
||||
}, {
|
||||
Name: "ReadAllReuseRecord",
|
||||
Input: "§a,§b\n¶§c,§d",
|
||||
Output: [][]string{
|
||||
{"a", "b"},
|
||||
{"c", "d"},
|
||||
},
|
||||
ReuseRecord: true,
|
||||
}, {
|
||||
Name: "StartLine1", // Issue 19019
|
||||
Input: "§a,\"b\nc∑\"d,e",
|
||||
Errors: []error{&ParseError{Err: ErrQuote}},
|
||||
}, {
|
||||
Name: "StartLine2",
|
||||
Input: "§a,§b\n¶§\"d\n\n,e∑",
|
||||
Errors: []error{nil, &ParseError{Err: ErrQuote}},
|
||||
Output: [][]string{{"a", "b"}},
|
||||
}, {
|
||||
Name: "CRLFInQuotedField", // Issue 21201
|
||||
Input: "§A,§\"Hello\r\nHi\",§B\r\n",
|
||||
Output: [][]string{
|
||||
{"A", "Hello\nHi", "B"},
|
||||
},
|
||||
}, {
|
||||
Name: "BinaryBlobField", // Issue 19410
|
||||
Input: "§x09\x41\xb4\x1c,§aktau",
|
||||
Output: [][]string{{"x09A\xb4\x1c", "aktau"}},
|
||||
}, {
|
||||
Name: "TrailingCR",
|
||||
Input: "§field1,§field2\r",
|
||||
Output: [][]string{{"field1", "field2"}},
|
||||
}, {
|
||||
Name: "QuotedTrailingCR",
|
||||
Input: "§\"field\"\r",
|
||||
Output: [][]string{{"field"}},
|
||||
}, {
|
||||
Name: "QuotedTrailingCRCR",
|
||||
Input: "§\"field∑\"\r\r",
|
||||
Errors: []error{&ParseError{Err: ErrQuote}},
|
||||
}, {
|
||||
Name: "FieldCR",
|
||||
Input: "§field\rfield\r",
|
||||
Output: [][]string{{"field\rfield"}},
|
||||
}, {
|
||||
Name: "FieldCRCR",
|
||||
Input: "§field\r\rfield\r\r",
|
||||
Output: [][]string{{"field\r\rfield\r"}},
|
||||
}, {
|
||||
Name: "FieldCRCRLF",
|
||||
Input: "§field\r\r\n¶§field\r\r\n",
|
||||
Output: [][]string{{"field\r"}, {"field\r"}},
|
||||
}, {
|
||||
Name: "FieldCRCRLFCR",
|
||||
Input: "§field\r\r\n¶§\rfield\r\r\n\r",
|
||||
Output: [][]string{{"field\r"}, {"\rfield\r"}},
|
||||
}, {
|
||||
Name: "FieldCRCRLFCRCR",
|
||||
Input: "§field\r\r\n¶§\r\rfield\r\r\n¶§\r\r",
|
||||
Output: [][]string{{"field\r"}, {"\r\rfield\r"}, {"\r"}},
|
||||
}, {
|
||||
Name: "MultiFieldCRCRLFCRCR",
|
||||
Input: "§field1,§field2\r\r\n¶§\r\rfield1,§field2\r\r\n¶§\r\r,§",
|
||||
Output: [][]string{
|
||||
{"field1", "field2\r"},
|
||||
{"\r\rfield1", "field2\r"},
|
||||
{"\r\r", ""},
|
||||
},
|
||||
}, {
|
||||
Name: "NonASCIICommaAndComment",
|
||||
Input: "§a£§b,c£ \t§d,e\n€ comment\n",
|
||||
Output: [][]string{{"a", "b,c", "d,e"}},
|
||||
TrimLeadingSpace: true,
|
||||
Comma: '£',
|
||||
Comment: '€',
|
||||
}, {
|
||||
Name: "NonASCIICommaAndCommentWithQuotes",
|
||||
Input: "§a€§\" b,\"€§ c\nλ comment\n",
|
||||
Output: [][]string{{"a", " b,", " c"}},
|
||||
Comma: '€',
|
||||
Comment: 'λ',
|
||||
}, {
|
||||
// λ and θ start with the same byte.
|
||||
// This tests that the parser doesn't confuse such characters.
|
||||
Name: "NonASCIICommaConfusion",
|
||||
Input: "§\"abθcd\"λ§efθgh",
|
||||
Output: [][]string{{"abθcd", "efθgh"}},
|
||||
Comma: 'λ',
|
||||
Comment: '€',
|
||||
}, {
|
||||
Name: "NonASCIICommentConfusion",
|
||||
Input: "§λ\n¶§λ\nθ\n¶§λ\n",
|
||||
Output: [][]string{{"λ"}, {"λ"}, {"λ"}},
|
||||
Comment: 'θ',
|
||||
}, {
|
||||
Name: "QuotedFieldMultipleLF",
|
||||
Input: "§\"\n\n\n\n\"",
|
||||
Output: [][]string{{"\n\n\n\n"}},
|
||||
}, {
|
||||
Name: "MultipleCRLF",
|
||||
Input: "\r\n\r\n\r\n\r\n",
|
||||
}, {
|
||||
// The implementation may read each line in several chunks if it doesn't fit entirely
|
||||
// in the read buffer, so we should test the code to handle that condition.
|
||||
Name: "HugeLines",
|
||||
Input: strings.Repeat("#ignore\n", 10000) + "§" + strings.Repeat("@", 5000) + ",§" + strings.Repeat("*", 5000),
|
||||
Output: [][]string{{strings.Repeat("@", 5000), strings.Repeat("*", 5000)}},
|
||||
Comment: '#',
|
||||
}, {
|
||||
Name: "QuoteWithTrailingCRLF",
|
||||
Input: "§\"foo∑\"bar\"\r\n",
|
||||
Errors: []error{&ParseError{Err: ErrQuote}},
|
||||
}, {
|
||||
Name: "LazyQuoteWithTrailingCRLF",
|
||||
Input: "§\"foo\"bar\"\r\n",
|
||||
Output: [][]string{{`foo"bar`}},
|
||||
LazyQuotes: true,
|
||||
}, {
|
||||
Name: "DoubleQuoteWithTrailingCRLF",
|
||||
Input: "§\"foo\"\"bar\"\r\n",
|
||||
Output: [][]string{{`foo"bar`}},
|
||||
}, {
|
||||
Name: "EvenQuotes",
|
||||
Input: `§""""""""`,
|
||||
Output: [][]string{{`"""`}},
|
||||
}, {
|
||||
Name: "OddQuotes",
|
||||
Input: `§"""""""∑`,
|
||||
Errors: []error{&ParseError{Err: ErrQuote}},
|
||||
}, {
|
||||
Name: "LazyOddQuotes",
|
||||
Input: `§"""""""`,
|
||||
Output: [][]string{{`"""`}},
|
||||
LazyQuotes: true,
|
||||
}, {
|
||||
Name: "BadComma1",
|
||||
Comma: '\n',
|
||||
Errors: []error{errInvalidDelim},
|
||||
}, {
|
||||
Name: "BadComma2",
|
||||
Comma: '\r',
|
||||
Errors: []error{errInvalidDelim},
|
||||
}, {
|
||||
Name: "BadComma3",
|
||||
Comma: '"',
|
||||
Errors: []error{errInvalidDelim},
|
||||
}, {
|
||||
Name: "BadComma4",
|
||||
Comma: utf8.RuneError,
|
||||
Errors: []error{errInvalidDelim},
|
||||
}, {
|
||||
Name: "BadComment1",
|
||||
Comment: '\n',
|
||||
Errors: []error{errInvalidDelim},
|
||||
}, {
|
||||
Name: "BadComment2",
|
||||
Comment: '\r',
|
||||
Errors: []error{errInvalidDelim},
|
||||
}, {
|
||||
Name: "BadComment3",
|
||||
Comment: utf8.RuneError,
|
||||
Errors: []error{errInvalidDelim},
|
||||
}, {
|
||||
Name: "BadCommaComment",
|
||||
Comma: 'X',
|
||||
Comment: 'X',
|
||||
Errors: []error{errInvalidDelim},
|
||||
}}
|
||||
|
||||
for _, tt := range tests {
|
||||
func TestRead(t *testing.T) {
|
||||
newReader := func(tt readTest) (*Reader, [][][2]int, map[int][2]int) {
|
||||
positions, errPositions, input := makePositions(tt.Input)
|
||||
r := NewReader(strings.NewReader(input))
|
||||
|
||||
if tt.Comma != 0 {
|
||||
r.Comma = tt.Comma
|
||||
}
|
||||
r.Comment = tt.Comment
|
||||
if tt.UseFieldsPerRecord {
|
||||
r.FieldsPerRecord = tt.FieldsPerRecord
|
||||
} else {
|
||||
r.FieldsPerRecord = -1
|
||||
}
|
||||
r.LazyQuotes = tt.LazyQuotes
|
||||
r.TrimLeadingSpace = tt.TrimLeadingSpace
|
||||
r.ReuseRecord = tt.ReuseRecord
|
||||
return r, positions, errPositions
|
||||
}
|
||||
|
||||
for _, tt := range readTests {
|
||||
t.Run(tt.Name, func(t *testing.T) {
|
||||
r := NewReader(strings.NewReader(tt.Input))
|
||||
|
||||
if tt.Comma != 0 {
|
||||
r.Comma = tt.Comma
|
||||
}
|
||||
r.Comment = tt.Comment
|
||||
if tt.UseFieldsPerRecord {
|
||||
r.FieldsPerRecord = tt.FieldsPerRecord
|
||||
} else {
|
||||
r.FieldsPerRecord = -1
|
||||
}
|
||||
r.LazyQuotes = tt.LazyQuotes
|
||||
r.TrimLeadingSpace = tt.TrimLeadingSpace
|
||||
r.ReuseRecord = tt.ReuseRecord
|
||||
|
||||
r, positions, errPositions := newReader(tt)
|
||||
out, err := r.ReadAll()
|
||||
if !reflect.DeepEqual(err, tt.Error) {
|
||||
t.Errorf("ReadAll() error:\ngot %v\nwant %v", err, tt.Error)
|
||||
} else if !reflect.DeepEqual(out, tt.Output) {
|
||||
t.Errorf("ReadAll() output:\ngot %q\nwant %q", out, tt.Output)
|
||||
if wantErr := firstError(tt.Errors, positions, errPositions); wantErr != nil {
|
||||
if !reflect.DeepEqual(err, wantErr) {
|
||||
t.Fatalf("ReadAll() error mismatch:\ngot %v (%#v)\nwant %v (%#v)", err, err, wantErr, wantErr)
|
||||
}
|
||||
if out != nil {
|
||||
t.Fatalf("ReadAll() output:\ngot %q\nwant nil", out)
|
||||
}
|
||||
} else {
|
||||
if err != nil {
|
||||
t.Fatalf("unexpected Readall() error: %v", err)
|
||||
}
|
||||
if !reflect.DeepEqual(out, tt.Output) {
|
||||
t.Fatalf("ReadAll() output:\ngot %q\nwant %q", out, tt.Output)
|
||||
}
|
||||
}
|
||||
|
||||
// Check field and error positions.
|
||||
r, _, _ = newReader(tt)
|
||||
for recNum := 0; ; recNum++ {
|
||||
rec, err := r.Read()
|
||||
var wantErr error
|
||||
if recNum < len(tt.Errors) && tt.Errors[recNum] != nil {
|
||||
wantErr = errorWithPosition(tt.Errors[recNum], recNum, positions, errPositions)
|
||||
} else if recNum >= len(tt.Output) {
|
||||
wantErr = io.EOF
|
||||
}
|
||||
if !reflect.DeepEqual(err, wantErr) {
|
||||
t.Fatalf("Read() error at record %d:\ngot %v (%#v)\nwant %v (%#v)", recNum, err, err, wantErr, wantErr)
|
||||
}
|
||||
// ErrFieldCount is explicitly non-fatal.
|
||||
if err != nil && !errors.Is(err, ErrFieldCount) {
|
||||
if recNum < len(tt.Output) {
|
||||
t.Fatalf("need more records; got %d want %d", recNum, len(tt.Output))
|
||||
}
|
||||
break
|
||||
}
|
||||
if got, want := rec, tt.Output[recNum]; !reflect.DeepEqual(got, want) {
|
||||
t.Errorf("Read vs ReadAll mismatch;\ngot %q\nwant %q", got, want)
|
||||
}
|
||||
pos := positions[recNum]
|
||||
if len(pos) != len(rec) {
|
||||
t.Fatalf("mismatched position length at record %d", recNum)
|
||||
}
|
||||
for i := range rec {
|
||||
line, col := r.FieldPos(i)
|
||||
if got, want := [2]int{line, col}, pos[i]; got != want {
|
||||
t.Errorf("position mismatch at record %d, field %d;\ngot %v\nwant %v", recNum, i, got, want)
|
||||
}
|
||||
}
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
// firstError returns the first non-nil error in errs,
|
||||
// with the position adjusted according to the error's
|
||||
// index inside positions.
|
||||
func firstError(errs []error, positions [][][2]int, errPositions map[int][2]int) error {
|
||||
for i, err := range errs {
|
||||
if err != nil {
|
||||
return errorWithPosition(err, i, positions, errPositions)
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func errorWithPosition(err error, recNum int, positions [][][2]int, errPositions map[int][2]int) error {
|
||||
parseErr, ok := err.(*ParseError)
|
||||
if !ok {
|
||||
return err
|
||||
}
|
||||
if recNum >= len(positions) {
|
||||
panic(fmt.Errorf("no positions found for error at record %d", recNum))
|
||||
}
|
||||
errPos, ok := errPositions[recNum]
|
||||
if !ok {
|
||||
panic(fmt.Errorf("no error position found for error at record %d", recNum))
|
||||
}
|
||||
parseErr1 := *parseErr
|
||||
parseErr1.StartLine = positions[recNum][0][0]
|
||||
parseErr1.Line = errPos[0]
|
||||
parseErr1.Column = errPos[1]
|
||||
return &parseErr1
|
||||
}
|
||||
|
||||
// makePositions returns the expected field positions of all
|
||||
// the fields in text, the positions of any errors, and the text with the position markers
|
||||
// removed.
|
||||
//
|
||||
// The start of each field is marked with a § symbol;
|
||||
// CSV lines are separated by ¶ symbols;
|
||||
// Error positions are marked with ∑ symbols.
|
||||
func makePositions(text string) ([][][2]int, map[int][2]int, string) {
|
||||
buf := make([]byte, 0, len(text))
|
||||
var positions [][][2]int
|
||||
errPositions := make(map[int][2]int)
|
||||
line, col := 1, 1
|
||||
recNum := 0
|
||||
|
||||
for len(text) > 0 {
|
||||
r, size := utf8.DecodeRuneInString(text)
|
||||
switch r {
|
||||
case '\n':
|
||||
line++
|
||||
col = 1
|
||||
buf = append(buf, '\n')
|
||||
case '§':
|
||||
if len(positions) == 0 {
|
||||
positions = append(positions, [][2]int{})
|
||||
}
|
||||
positions[len(positions)-1] = append(positions[len(positions)-1], [2]int{line, col})
|
||||
case '¶':
|
||||
positions = append(positions, [][2]int{})
|
||||
recNum++
|
||||
case '∑':
|
||||
errPositions[recNum] = [2]int{line, col}
|
||||
default:
|
||||
buf = append(buf, text[:size]...)
|
||||
col += size
|
||||
}
|
||||
text = text[size:]
|
||||
}
|
||||
return positions, errPositions, string(buf)
|
||||
}
|
||||
|
||||
// nTimes is an io.Reader which yields the string s n times.
|
||||
type nTimes struct {
|
||||
s string
|
||||
|
||||
Loading…
Reference in New Issue
Block a user