Pas2js, typed arrays and ANSI strings
lazarus / 76-Pas2JS

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Kryvich · 2019-01-22 11:22

Hi,
Can Pas2js transpile Delphi/FPC typed arrays to their counterparts in
JavaScript? I mean
array of Integer -> Int32Arrayarray of Byte -> UInt8Arrayarray of Word
-> UInt16Arrayetc.I see declarations of TJSInt32Array, TJSUint8Array,
TJSUint16Array in js.pas, but when I try to transpile my test program
I can't find these names in the result JS file.

If/when these arrays will be supported by the transpiler, we can move
further and try to convert AnsiStrings as UInt8Array.

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Kryvich · 2019-01-22 12:23

OK I can use JavaScript typed arrays using bindings from js.pas!

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i program
TestTypedArrays;{$IFDEF PAS2JS}uses  JS;{$ENDIF} type{$IFDEF PAS2JS} 
TByteArray = TJSUint8Array;  TWordArray = TJSUint16Array;{$ELSE} 
TByteArray = array of Byte;  TWordArray = array of
Word;{$ENDIF} procedure Test;var  ba: TByteArray;  wa:
TWordArray;begin{$IFDEF PAS2JS}  ba := TByteArray.new(10);{$ELSE} 
SetLength(ba, 10);{$ENDIF}  ba[0] := $FF;{$IFDEF PAS2JS}  wa :=
TWordArray.new(20);{$ELSE}  SetLength(wa, 20);{$ENDIF}  wa[1] :=
$FFEE;  Writeln('ba[0] = ', ba[0], ', wa[1] = ', wa[1]);end; begin 
Test;end.
But there is too much IFDEFs. Would be nice to have the same syntax as
in Delphi/FPC.

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mattias · 2019-02-18 17:20

At the moment all dynamic arrays are TJSArrays.
Using the typed arrays is an interesting proposal.