encoding/csv: rename ParseError.RecordLine to .StartLine

A record can span multiple lines (the whole reason for the extra field),
so the important fact is that it's the _start_ of the record.
Make that clear in the name.

(This API was added during the Go 1.10 cycle so it can still be cleaned up.)

Change-Id: Id95b3ceb7cdfc4aa0ed5a053cb84da8945fa5496
Reviewed-on: https://go-review.googlesource.com/78119
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>

src/encoding/csv/reader.go

@@ -64,7 +64,7 @@ import (
 // A ParseError is returned for parsing errors.
 // Line numbers are 1-indexed and columns are 0-indexed.
 type ParseError struct {
-	RecordLine int   // Line where the record starts
+	StartLine int   // Line where the record starts
 	Line      int   // Line where the error occurred
 	Column    int   // Column (rune index) where the error occurred
 	Err       error // The actual error
@@ -74,8 +74,8 @@ func (e *ParseError) Error() string {
 	if e.Err == ErrFieldCount {
 		return fmt.Sprintf("record on line %d: %v", e.Line, e.Err)
 	}
-	if e.RecordLine != e.Line {
-		return fmt.Sprintf("record on line %d; parse error on line %d, column %d: %v", e.RecordLine, e.Line, e.Column, e.Err)
+	if e.StartLine != e.Line {
+		return fmt.Sprintf("record on line %d; parse error on line %d, column %d: %v", e.StartLine, e.Line, e.Column, e.Err)
 	}
 	return fmt.Sprintf("parse error on line %d, column %d: %v", e.Line, e.Column, e.Err)
 }
@@ -287,7 +287,7 @@ parseField:
 			if !r.LazyQuotes {
 				if j := bytes.IndexByte(field, '"'); j >= 0 {
 					col := utf8.RuneCount(fullLine[:len(fullLine)-len(line[j:])])
-					err = &ParseError{RecordLine: recLine, Line: r.numLine, Column: col, Err: ErrBareQuote}
+					err = &ParseError{StartLine: recLine, Line: r.numLine, Column: col, Err: ErrBareQuote}
 					break parseField
 				}
 			}
@@ -327,7 +327,7 @@ parseField:
 					default:
 						// `"*` sequence (invalid non-escaped quote).
 						col := utf8.RuneCount(fullLine[:len(fullLine)-len(line)-quoteLen])
-						err = &ParseError{RecordLine: recLine, Line: r.numLine, Column: col, Err: ErrQuote}
+						err = &ParseError{StartLine: recLine, Line: r.numLine, Column: col, Err: ErrQuote}
 						break parseField
 					}
 				} else if len(line) > 0 {
@@ -345,7 +345,7 @@ parseField:
 					// Abrupt end of file (EOF or error).
 					if !r.LazyQuotes && errRead == nil {
 						col := utf8.RuneCount(fullLine)
-						err = &ParseError{RecordLine: recLine, Line: r.numLine, Column: col, Err: ErrQuote}
+						err = &ParseError{StartLine: recLine, Line: r.numLine, Column: col, Err: ErrQuote}
 						break parseField
 					}
 					r.fieldIndexes = append(r.fieldIndexes, len(r.recordBuffer))
@@ -375,7 +375,7 @@ parseField:
 	// Check or update the expected fields per record.
 	if r.FieldsPerRecord > 0 {
 		if len(dst) != r.FieldsPerRecord && err == nil {
-			err = &ParseError{RecordLine: recLine, Line: recLine, Err: ErrFieldCount}
+			err = &ParseError{StartLine: recLine, Line: recLine, Err: ErrFieldCount}
 		}
 	} else if r.FieldsPerRecord == 0 {
 		r.FieldsPerRecord = len(dst)

src/encoding/csv/reader_test.go

@@ -123,7 +123,7 @@ field"`,
 	}, {
 		Name:  "BadDoubleQuotes",
 		Input: `a""b,c`,
-		Error: &ParseError{RecordLine: 1, Line: 1, Column: 1, Err: ErrBareQuote},
+		Error: &ParseError{StartLine: 1, Line: 1, Column: 1, Err: ErrBareQuote},
 	}, {
 		Name:             "TrimQuote",
 		Input:            ` "a"," b",c`,
@@ -132,25 +132,25 @@ field"`,
 	}, {
 		Name:  "BadBareQuote",
 		Input: `a "word","b"`,
-		Error: &ParseError{RecordLine: 1, Line: 1, Column: 2, Err: ErrBareQuote},
+		Error: &ParseError{StartLine: 1, Line: 1, Column: 2, Err: ErrBareQuote},
 	}, {
 		Name:  "BadTrailingQuote",
 		Input: `"a word",b"`,
-		Error: &ParseError{RecordLine: 1, Line: 1, Column: 10, Err: ErrBareQuote},
+		Error: &ParseError{StartLine: 1, Line: 1, Column: 10, Err: ErrBareQuote},
 	}, {
 		Name:  "ExtraneousQuote",
 		Input: `"a "word","b"`,
-		Error: &ParseError{RecordLine: 1, Line: 1, Column: 3, Err: ErrQuote},
+		Error: &ParseError{StartLine: 1, Line: 1, Column: 3, Err: ErrQuote},
 	}, {
 		Name:               "BadFieldCount",
 		Input:              "a,b,c\nd,e",
-		Error:              &ParseError{RecordLine: 2, Line: 2, Err: ErrFieldCount},
+		Error:              &ParseError{StartLine: 2, Line: 2, Err: ErrFieldCount},
 		UseFieldsPerRecord: true,
 		FieldsPerRecord:    0,
 	}, {
 		Name:               "BadFieldCount1",
 		Input:              `a,b,c`,
-		Error:              &ParseError{RecordLine: 1, Line: 1, Err: ErrFieldCount},
+		Error:              &ParseError{StartLine: 1, Line: 1, Err: ErrFieldCount},
 		UseFieldsPerRecord: true,
 		FieldsPerRecord:    2,
 	}, {
@@ -226,13 +226,13 @@ x,,,
 		},
 		ReuseRecord: true,
 	}, {
-		Name:  "RecordLine1", // Issue 19019
+		Name:  "StartLine1", // Issue 19019
 		Input: "a,\"b\nc\"d,e",
-		Error: &ParseError{RecordLine: 1, Line: 2, Column: 1, Err: ErrQuote},
+		Error: &ParseError{StartLine: 1, Line: 2, Column: 1, Err: ErrQuote},
 	}, {
-		Name:  "RecordLine2",
+		Name:  "StartLine2",
 		Input: "a,b\n\"d\n\n,e",
-		Error: &ParseError{RecordLine: 2, Line: 5, Column: 0, Err: ErrQuote},
+		Error: &ParseError{StartLine: 2, Line: 5, Column: 0, Err: ErrQuote},
 	}, {
 		Name:  "CRLFInQuotedField", // Issue 21201
 		Input: "\"Hello\r\nHi\"",
@@ -290,7 +290,7 @@ x,,,
 	}, {
 		Name:  "QuoteWithTrailingCRLF",
 		Input: "\"foo\"bar\"\r\n",
-		Error: &ParseError{RecordLine: 1, Line: 1, Column: 4, Err: ErrQuote},
+		Error: &ParseError{StartLine: 1, Line: 1, Column: 4, Err: ErrQuote},
 	}, {
 		Name:       "LazyQuoteWithTrailingCRLF",
 		Input:      "\"foo\"bar\"\r\n",
@@ -307,7 +307,7 @@ x,,,
 	}, {
 		Name:  "OddQuotes",
 		Input: `"""""""`,
-		Error: &ParseError{RecordLine: 1, Line: 1, Column: 7, Err: ErrQuote},
+		Error: &ParseError{StartLine: 1, Line: 1, Column: 7, Err: ErrQuote},
 	}, {
 		Name:       "LazyOddQuotes",
 		Input:      `"""""""`,