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fpscsv.pas
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fpscsv.pas
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unit fpscsv;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils,
fpstypes, fpspreadsheet, fpsReaderWriter, fpsCsvDocument;
type
TsCSVReader = class(TsCustomSpreadReader)
private
FWorksheetName: String;
FFormatSettings: TFormatSettings;
function IsBool(AText: String; out AValue: Boolean): Boolean;
function IsDateTime(AText: String; out ADateTime: TDateTime;
out ANumFormat: TsNumberFormat): Boolean;
function IsNumber(AText: String; out ANumber: Double; out ANumFormat: TsNumberFormat;
out ADecimals: Integer; out ACurrencySymbol, AWarning: String): Boolean;
function IsQuotedText(var AText: String): Boolean;
procedure ReadCellValue(ARow, ACol: Cardinal; AText: String);
protected
procedure ReadBlank(AStream: TStream); override;
procedure ReadFormula(AStream: TStream); override;
procedure ReadLabel(AStream: TStream); override;
procedure ReadNumber(AStream: TStream); override;
public
constructor Create(AWorkbook: TsWorkbook); override;
procedure ReadFromFile(AFileName: String); override;
procedure ReadFromStream(AStream: TStream); override;
procedure ReadFromStrings(AStrings: TStrings); override;
end;
TsCSVWriter = class(TsCustomSpreadWriter)
private
FCSVBuilder: TCSVBuilder;
FEncoding: String;
FFormatSettings: TFormatSettings;
protected
procedure WriteBlank(AStream: TStream; const ARow, ACol: Cardinal;
ACell: PCell); override;
procedure WriteBool(AStream: TStream; const ARow, ACol: Cardinal;
const AValue: Boolean; ACell: PCell); override;
procedure WriteDateTime(AStream: TStream; const ARow, ACol: Cardinal;
const AValue: TDateTime; ACell: PCell); override;
procedure WriteFormula(AStream: TStream; const ARow, ACol: Cardinal;
ACell: PCell); override;
procedure WriteLabel(AStream: TStream; const ARow, ACol: Cardinal;
const AValue: string; ACell: PCell); override;
procedure WriteNumber(AStream: TStream; const ARow, ACol: Cardinal;
const AValue: double; ACell: PCell); override;
procedure WriteSheet(AStream: TStream; AWorksheet: TsWorksheet);
public
constructor Create(AWorkbook: TsWorkbook); override;
procedure WriteToStream(AStream: TStream); override;
procedure WriteToStrings(AStrings: TStrings); override;
end;
TsCSVLineEnding = (leSystem, leCRLF, leCR, leLF);
TsCSVParams = record // W = writing, R = reading, RW = reading/writing
SheetIndex: Integer; // W: Index of the sheet to be written
LineEnding: TsCSVLineEnding; // W: Specification for line ending to be written
Delimiter: Char; // RW: Column delimiter
QuoteChar: Char; // RW: Character for quoting texts
Encoding: String; // RW: Encoding of file (code page, such as "utf8", "cp1252" etc)
DetectContentType: Boolean; // R: try to convert strings to content types
NumberFormat: String; // W: if empty write numbers like in sheet, otherwise use this format
AutoDetectNumberFormat: Boolean; // R: automatically detects decimal/thousand separator used in numbers
TrueText: String; // RW: String for boolean TRUE
FalseText: String; // RW: String for boolean FALSE
FormatSettings: TFormatSettings; // RW: add'l parameters for conversion
end;
var
CSVParams: TsCSVParams = (
SheetIndex: 0;
LineEnding: leSystem;
Delimiter: ';';
QuoteChar: '"';
Encoding: ''; // '' = auto-detect when reading, UTF8 when writing
DetectContentType: true;
NumberFormat: '';
AutoDetectNumberFormat: true;
TrueText: 'TRUE';
FalseText: 'FALSE';
{%H-});
function LineEndingAsString(ALineEnding: TsCSVLineEnding): String;
implementation
uses
//StrUtils,
DateUtils, LConvEncoding, Math,
fpsUtils, fpsCurrency, fpsNumFormat;
{ Initializes the FormatSettings of the CSVParams to default values which
can be replaced by the FormatSettings of the workbook's FormatSettings }
procedure InitCSVFormatSettings;
var
i: Integer;
begin
with CSVParams.FormatSettings do
begin
CurrencyFormat := Byte(-1);
NegCurrFormat := Byte(-1);
ThousandSeparator := #0;
DecimalSeparator := #0;
CurrencyDecimals := Byte(-1);
DateSeparator := #0;
TimeSeparator := #0;
ListSeparator := #0;
CurrencyString := '';
ShortDateFormat := '';
LongDateFormat := '';
TimeAMString := '';
TimePMString := '';
ShortTimeFormat := '';
LongTimeFormat := '';
for i:=1 to 12 do
begin
ShortMonthNames[i] := '';
LongMonthNames[i] := '';
end;
for i:=1 to 7 do
begin
ShortDayNames[i] := '';
LongDayNames[i] := '';
end;
TwoDigitYearCenturyWindow := Word(-1);
end;
end;
procedure ReplaceFormatSettings(var AFormatSettings: TFormatSettings;
const ADefaultFormats: TFormatSettings);
var
i: Integer;
begin
if AFormatSettings.CurrencyFormat = Byte(-1) then
AFormatSettings.CurrencyFormat := ADefaultFormats.CurrencyFormat;
if AFormatSettings.NegCurrFormat = Byte(-1) then
AFormatSettings.NegCurrFormat := ADefaultFormats.NegCurrFormat;
if AFormatSettings.ThousandSeparator = #0 then
AFormatSettings.ThousandSeparator := ADefaultFormats.ThousandSeparator;
if AFormatSettings.DecimalSeparator = #0 then
AFormatSettings.DecimalSeparator := ADefaultFormats.DecimalSeparator;
if AFormatSettings.CurrencyDecimals = Byte(-1) then
AFormatSettings.CurrencyDecimals := ADefaultFormats.CurrencyDecimals;
if AFormatSettings.DateSeparator = #0 then
AFormatSettings.DateSeparator := ADefaultFormats.DateSeparator;
if AFormatSettings.TimeSeparator = #0 then
AFormatSettings.TimeSeparator := ADefaultFormats.TimeSeparator;
if AFormatSettings.ListSeparator = #0 then
AFormatSettings.ListSeparator := ADefaultFormats.ListSeparator;
if AFormatSettings.CurrencyString = '' then
AFormatSettings.CurrencyString := ADefaultFormats.CurrencyString;
if AFormatSettings.ShortDateFormat = '' then
AFormatSettings.ShortDateFormat := ADefaultFormats.ShortDateFormat;
if AFormatSettings.LongDateFormat = '' then
AFormatSettings.LongDateFormat := ADefaultFormats.LongDateFormat;
if AFormatSettings.ShortTimeFormat = '' then
AFormatSettings.ShortTimeFormat := ADefaultFormats.ShortTimeFormat;
if AFormatSettings.LongTimeFormat = '' then
AFormatSettings.LongTimeFormat := ADefaultFormats.LongTimeFormat;
for i:=1 to 12 do
begin
if AFormatSettings.ShortMonthNames[i] = '' then
AFormatSettings.ShortMonthNames[i] := ADefaultFormats.ShortMonthNames[i];
if AFormatSettings.LongMonthNames[i] = '' then
AFormatSettings.LongMonthNames[i] := ADefaultFormats.LongMonthNames[i];
end;
for i:=1 to 7 do
begin
if AFormatSettings.ShortDayNames[i] = '' then
AFormatSettings.ShortDayNames[i] := ADefaultFormats.ShortDayNames[i];
if AFormatSettings.LongDayNames[i] = '' then
AFormatSettings.LongDayNames[i] := ADefaultFormats.LongDayNames[i];
end;
if AFormatSettings.TwoDigitYearCenturyWindow = Word(-1) then
AFormatSettings.TwoDigitYearCenturyWindow := ADefaultFormats.TwoDigitYearCenturyWindow;
end;
function LineEndingAsString(ALineEnding: TsCSVLineEnding): String;
begin
case ALineEnding of
leSystem: Result := LineEnding;
leCR : Result := #13;
leLF : Result := #10;
leCRLF : Result := #13#10;
end;
end;
{ -----------------------------------------------------------------------------}
{ TsCSVReader }
{------------------------------------------------------------------------------}
constructor TsCSVReader.Create(AWorkbook: TsWorkbook);
begin
inherited Create(AWorkbook);
FWorksheetName := 'Sheet1'; // will be replaced by filename
FFormatSettings := CSVParams.FormatSettings;
ReplaceFormatSettings(FFormatSettings, FWorkbook.FormatSettings);
end;
function TsCSVReader.IsBool(AText: String; out AValue: Boolean): Boolean;
begin
if SameText(AText, CSVParams.TrueText) then
begin
AValue := true;
Result := true;
end else
if SameText(AText, CSVParams.FalseText) then
begin
AValue := false;
Result := true;
end else
Result := false;
end;
function TsCSVReader.IsDateTime(AText: String; out ADateTime: TDateTime;
out ANumFormat: TsNumberFormat): Boolean;
{ Test whether the text is formatted according to a built-in date/time format.
Converts the obtained date/time value back to a string and compares. }
function TestFormat(lNumFmt: TsNumberFormat): Boolean;
var
fmt: string;
begin
fmt := BuildDateTimeFormatString(lNumFmt, FFormatSettings);
Result := FormatDateTime(fmt, ADateTime, FFormatSettings) = AText;
if Result then ANumFormat := lNumFmt;
end;
begin
Result := TryStrToDateTime(AText, ADateTime, FFormatSettings);
if Result then
begin
ANumFormat := nfCustom;
if abs(ADateTime) > 1 then // this is most probably a date
begin
if TestFormat(nfShortDateTime) then
exit;
if TestFormat(nfLongDate) then
exit;
if TestFormat(nfShortDate) then
exit;
end else
begin // this case is time-only
if TestFormat(nfLongTimeAM) then
exit;
if TestFormat(nfLongTime) then
exit;
if TestFormat(nfShortTimeAM) then
exit;
if TestFormat(nfShortTime) then
exit;
end;
end;
end;
function TsCSVReader.IsNumber(AText: String; out ANumber: Double;
out ANumFormat: TsNumberFormat; out ADecimals: Integer;
out ACurrencySymbol, AWarning: String): Boolean;
var
p: Integer;
DecSep, ThousSep: Char;
begin
Result := false;
AWarning := '';
// To detect whether the text is a currency value we look for the currency
// string. If we find it, we delete it and convert the remaining string to
// a number.
ACurrencySymbol := FFormatSettings.CurrencyString;
if RemoveCurrencySymbol(ACurrencySymbol, AText) then
begin
if IsNegative(AText) then
begin
if AText = '' then
exit;
AText := '-' + AText;
end;
end else
ACurrencySymbol := '';
if CSVParams.AutoDetectNumberFormat then
Result := TryStrToFloatAuto(AText, ANumber, DecSep, ThousSep, AWarning)
else begin
Result := TryStrToFloat(AText, ANumber, FFormatSettings);
if Result then
begin
if pos(FFormatSettings.DecimalSeparator, AText) = 0
then DecSep := #0
else DecSep := FFormatSettings.DecimalSeparator;
if pos(CSVParams.FormatSettings.ThousandSeparator, AText) = 0
then ThousSep := #0
else ThousSep := FFormatSettings.ThousandSeparator;
end;
end;
// Try to determine the number format
if Result then
begin
if ThousSep <> #0 then
ANumFormat := nfFixedTh
else
ANumFormat := nfGeneral;
// count number of decimal places and try to catch special formats
ADecimals := 0;
if DecSep <> #0 then
begin
// Go to the decimal separator and search towards the end of the string
p := pos(DecSep, AText) + 1;
while (p <= Length(AText)) do begin
// exponential format
if AText[p] in ['+', '-', 'E', 'e'] then
begin
ANumFormat := nfExp;
break;
end else
// percent format
if AText[p] = '%' then
begin
ANumFormat := nfPercentage;
break;
end else
begin
inc(p);
inc(ADecimals);
end;
end;
if (ADecimals > 0) and (ADecimals < 9) and (ANumFormat = nfGeneral) then
// "no formatting" assumed if there are "many" decimals
ANumFormat := nfFixed;
end else
begin
p := Length(AText);
while (p > 0) do begin
case AText[p] of
'%' : ANumFormat := nfPercentage;
'e', 'E': ANumFormat := nfExp;
else dec(p);
end;
break;
end;
end;
end else
ACurrencySymbol := '';
end;
{ Checks if text is quoted; strips any starting and ending quotes }
function TsCSVReader.IsQuotedText(var AText: String): Boolean;
begin
if (Length(AText) > 1) and (CSVParams.QuoteChar <> #0) and
(AText[1] = CSVParams.QuoteChar) and
(AText[Length(AText)] = CSVParams.QuoteChar) then
begin
Delete(AText, 1, 1);
Delete(AText, Length(AText), 1);
Result := true;
end else
Result := false;
end;
procedure TsCSVReader.ReadBlank(AStream: TStream);
begin
Unused(AStream);
end;
{ Determines content types from/for the text read from the csv file and writes
the corresponding data to the worksheet. }
procedure TsCSVReader.ReadCellValue(ARow, ACol: Cardinal; AText: String);
var
dblValue: Double;
dtValue: TDateTime;
boolValue: Boolean;
currSym: string;
warning: String;
nf: TsNumberFormat;
decs: Integer;
cell: PCell;
begin
// Empty strings are blank cells -- nothing to do
if AText = '' then
exit;
cell := FWorksheet.AddCell(ARow, ACol);
// Do not try to interpret the strings. --> everything is a LABEL cell.
if not CSVParams.DetectContentType then
begin
FWorksheet.WriteUTF8Text(cell, AText);
exit;
end;
// Check for a NUMBER or CURRENCY cell
if IsNumber(AText, dblValue, nf, decs, currSym, warning) then
begin
if currSym <> '' then
FWorksheet.WriteCurrency(cell, dblValue, nfCurrency, decs, currSym)
else
FWorksheet.WriteNumber(cell, dblValue, nf, decs);
if warning <> '' then
FWorkbook.AddErrorMsg('Cell %s: %s', [GetCellString(ARow, ACol), warning]);
exit;
end;
// Check for a DATE/TIME cell
// No idea how to apply the date/time formatsettings here...
if IsDateTime(AText, dtValue, nf) then
begin
FWorksheet.WriteDateTime(cell, dtValue, nf);
exit;
end;
// Check for a BOOLEAN cell
if IsBool(AText, boolValue) then
begin
FWorksheet.WriteBoolValue(cell, boolValue);
exit;
end;
// What is left is handled as a TEXT cell
FWorksheet.WriteUTF8Text(cell, AText);
end;
procedure TsCSVReader.ReadFormula(AStream: TStream);
begin
Unused(AStream);
end;
procedure TsCSVReader.ReadFromFile(AFileName: String);
begin
FWorksheetName := ChangeFileExt(ExtractFileName(AFileName), '');
inherited;
end;
procedure TsCSVReader.ReadFromStream(AStream: TStream);
var
Parser: TCSVParser;
s: String;
encoding: String;
begin
// Try to determine encoding of the input file
SetLength(s, Min(1000, AStream.Size));
AStream.ReadBuffer(s[1], Length(s));
if CSVParams.Encoding = '' then
encoding := GuessEncoding(s)
else
encoding := CSVParams.Encoding;
// Create worksheet
FWorksheet := FWorkbook.AddWorksheet(FWorksheetName, true);
// Create csv parser, read file and store in worksheet
Parser := TCSVParser.Create;
try
Parser.Delimiter := CSVParams.Delimiter;
Parser.LineEnding := LineEndingAsString(CSVParams.LineEnding);
Parser.QuoteChar := CSVParams.QuoteChar;
// Indicate column counts between rows may differ:
Parser.EqualColCountPerRow := false;
Parser.SetSource(AStream);
while Parser.ParseNextCell do begin
// Convert string to UTF8
s := Parser.CurrentCellText;
s := ConvertEncoding(s, encoding, EncodingUTF8);
ReadCellValue(Parser.CurrentRow, Parser.CurrentCol, s);
end;
finally
Parser.Free;
end;
end;
procedure TsCSVReader.ReadFromStrings(AStrings: TStrings);
var
Stream: TStringStream;
begin
Stream := TStringStream.Create(AStrings.Text);
try
ReadFromStream(Stream);
finally
Stream.Free;
end;
end;
procedure TsCSVReader.ReadLabel(AStream: TStream);
begin
Unused(AStream);
end;
procedure TsCSVReader.ReadNumber(AStream: TStream);
begin
Unused(AStream);
end;
{ -----------------------------------------------------------------------------}
{ TsCSVWriter }
{------------------------------------------------------------------------------}
constructor TsCSVWriter.Create(AWorkbook: TsWorkbook);
begin
inherited Create(AWorkbook);
FFormatSettings := CSVParams.FormatSettings;
ReplaceFormatSettings(FFormatSettings, FWorkbook.FormatSettings);
if CSVParams.Encoding = '' then
FEncoding := 'utf8'
else
FEncoding := CSVParams.Encoding;
end;
procedure TsCSVWriter.WriteBlank(AStream: TStream; const ARow, ACol: Cardinal;
ACell: PCell);
begin
Unused(AStream);
Unused(ARow, ACol, ACell);
// nothing to do
end;
{ Write boolean cell to stream formatted as string }
procedure TsCSVWriter.WriteBool(AStream: TStream; const ARow, ACol: Cardinal;
const AValue: Boolean; ACell: PCell);
var
s: String;
begin
Unused(AStream);
Unused(ARow, ACol, ACell);
if AValue then
s := CSVParams.TrueText
else
s := CSVParams.FalseText;
s := ConvertEncoding(s, EncodingUTF8, FEncoding);
FCSVBuilder.AppendCell(s);
end;
{ Write date/time values in the same way they are displayed in the sheet }
procedure TsCSVWriter.WriteDateTime(AStream: TStream; const ARow, ACol: Cardinal;
const AValue: TDateTime; ACell: PCell);
var
s: String;
begin
Unused(AStream);
Unused(ARow, ACol, AValue);
s := FWorksheet.ReadAsUTF8Text(ACell);
s := ConvertEncoding(s, EncodingUTF8, FEncoding);
FCSVBuilder.AppendCell(s);
end;
{ CSV does not support formulas, but we can write the formula results to
to stream. }
procedure TsCSVWriter.WriteFormula(AStream: TStream; const ARow, ACol: Cardinal;
ACell: PCell);
begin
if ACell = nil then
exit;
case ACell^.ContentType of
cctBool : WriteBool(AStream, ARow, ACol, ACell^.BoolValue, ACell);
cctEmpty : ;
cctDateTime : WriteDateTime(AStream, ARow, ACol, ACell^.DateTimeValue, ACell);
cctNumber : WriteNumber(AStream, ARow, ACol, ACell^.NumberValue, ACell);
cctUTF8String: WriteLabel(AStream, ARow, ACol, ACell^.UTF8StringValue, ACell);
cctError : ;
end;
end;
{ Writes a LABEL cell to the stream. }
procedure TsCSVWriter.WriteLabel(AStream: TStream; const ARow, ACol: Cardinal;
const AValue: string; ACell: PCell);
var
s: String;
begin
Unused(AStream);
Unused(ARow, ACol, AValue);
if ACell = nil then
exit;
s := ACell^.UTF8StringValue;
s := ConvertEncoding(s, EncodingUTF8, FEncoding);
// No need to quote; csvdocument will do that for us...
FCSVBuilder.AppendCell(s);
end;
{ Writes a number cell to the stream. }
procedure TsCSVWriter.WriteNumber(AStream: TStream; const ARow, ACol: Cardinal;
const AValue: double; ACell: PCell);
var
s: String;
begin
Unused(AStream);
Unused(ARow, ACol);
if ACell = nil then
exit;
if CSVParams.NumberFormat <> '' then
s := Format(CSVParams.NumberFormat, [AValue], FFormatSettings)
else
s := FWorksheet.ReadAsUTF8Text(ACell, FFormatSettings);
s := ConvertEncoding(s, EncodingUTF8, FEncoding);
FCSVBuilder.AppendCell(s);
end;
procedure TsCSVWriter.WriteSheet(AStream: TStream; AWorksheet: TsWorksheet);
var
r: Cardinal;
LastRow: Cardinal;
cell: PCell;
begin
FWorksheet := AWorksheet;
FCSVBuilder := TCSVBuilder.Create;
try
FCSVBuilder.Delimiter := CSVParams.Delimiter;
FCSVBuilder.LineEnding := LineEndingAsString(CSVParams.LineEnding);
FCSVBuilder.QuoteChar := CSVParams.QuoteChar;
FCSVBuilder.SetOutput(AStream);
LastRow := FWorksheet.GetLastOccupiedRowIndex;
for r := 0 to LastRow do
begin
for cell in FWorksheet.Cells.GetRowEnumerator(r) do
WriteCellToStream(AStream, cell);
FCSVBuilder.AppendRow;
end;
finally
FreeAndNil(FCSVBuilder);
end;
end;
procedure TsCSVWriter.WriteToStream(AStream: TStream);
var
n: Integer;
begin
if (CSVParams.SheetIndex >= 0) and (CSVParams.SheetIndex < FWorkbook.GetWorksheetCount)
then n := CSVParams.SheetIndex
else n := 0;
WriteSheet(AStream, FWorkbook.GetWorksheetByIndex(n));
end;
procedure TsCSVWriter.WriteToStrings(AStrings: TStrings);
var
Stream: TStream;
begin
Stream := TStringStream.Create('');
try
WriteToStream(Stream);
Stream.Position := 0;
AStrings.LoadFromStream(Stream);
finally
Stream.Free;
end;
end;
initialization
InitCSVFormatSettings;
RegisterSpreadFormat(TsCSVReader, TsCSVWriter, sfCSV);
end.