* Library demo

demo/wasienv/library/demolibadd.lpi

@@ -0,0 +1,91 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<CONFIG>
+  <ProjectOptions>
+    <Version Value="12"/>
+    <General>
+      <Flags>
+        <MainUnitHasCreateFormStatements Value="False"/>
+        <MainUnitHasTitleStatement Value="False"/>
+        <MainUnitHasScaledStatement Value="False"/>
+        <Runnable Value="False"/>
+      </Flags>
+      <SessionStorage Value="InProjectDir"/>
+      <Title Value="demolibadd"/>
+      <UseAppBundle Value="False"/>
+      <ResourceType Value="res"/>
+    </General>
+    <CustomData Count="4">
+      <Item0 Name="MaintainHTML" Value="1"/>
+      <Item1 Name="Pas2JSProject" Value="1"/>
+      <Item2 Name="PasJSLocation" Value="demolibadd"/>
+      <Item3 Name="PasJSWebBrowserProject" Value="1"/>
+    </CustomData>
+    <BuildModes>
+      <Item Name="Default" Default="True"/>
+    </BuildModes>
+    <PublishOptions>
+      <Version Value="2"/>
+      <UseFileFilters Value="True"/>
+    </PublishOptions>
+    <RunParams>
+      <FormatVersion Value="2"/>
+    </RunParams>
+    <Units>
+      <Unit>
+        <Filename Value="demolibadd.lpr"/>
+        <IsPartOfProject Value="True"/>
+        <UnitName Value="demowasienv"/>
+      </Unit>
+      <Unit>
+        <Filename Value="index.html"/>
+        <IsPartOfProject Value="True"/>
+        <CustomData Count="1">
+          <Item0 Name="PasJSIsProjectHTMLFile" Value="1"/>
+        </CustomData>
+      </Unit>
+    </Units>
+  </ProjectOptions>
+  <CompilerOptions>
+    <Version Value="11"/>
+    <Target>
+      <Filename Value="demolibadd"/>
+    </Target>
+    <SearchPaths>
+      <IncludeFiles Value="$(ProjOutDir)"/>
+      <UnitOutputDirectory Value="js"/>
+    </SearchPaths>
+    <Parsing>
+      <SyntaxOptions>
+        <AllowLabel Value="False"/>
+        <UseAnsiStrings Value="False"/>
+        <CPPInline Value="False"/>
+      </SyntaxOptions>
+    </Parsing>
+    <CodeGeneration>
+      <TargetOS Value="browser"/>
+    </CodeGeneration>
+    <Linking>
+      <Debugging>
+        <GenerateDebugInfo Value="False"/>
+        <UseLineInfoUnit Value="False"/>
+      </Debugging>
+    </Linking>
+    <Other>
+      <CustomOptions Value="-Jeutf-8 -Jirtl.js -Jc -Jminclude"/>
+      <CompilerPath Value="$(pas2js)"/>
+    </Other>
+  </CompilerOptions>
+  <Debugging>
+    <Exceptions>
+      <Item>
+        <Name Value="EAbort"/>
+      </Item>
+      <Item>
+        <Name Value="ECodetoolError"/>
+      </Item>
+      <Item>
+        <Name Value="EFOpenError"/>
+      </Item>
+    </Exceptions>
+  </Debugging>
+</CONFIG>

demo/wasienv/library/demolibadd.lpr

@@ -0,0 +1,125 @@
+program demowasienv;
+
+{$mode objfpc}
+
+uses
+  browserconsole, browserapp, JS, Classes, SysUtils, Web, WebAssembly, types, wasienv;
+
+Type
+
+  { TMyApplication }
+
+  TMyApplication = class(TBrowserApplication)
+  Private
+    FWasiEnv: TPas2JSWASIEnvironment;
+    FMemory : TJSWebAssemblyMemory; // Memory of webassembly
+    FTable : TJSWebAssemblyTable; // exported functions.
+    function CreateWebAssembly(Path: string; ImportObject: TJSObject
+      ): TJSPromise;
+    procedure DoWrite(Sender: TObject; const aOutput: String);
+    function initEnv(aValue: JSValue): JSValue;
+    procedure InitWebAssembly;
+  Public
+    Constructor Create(aOwner : TComponent); override;
+    Destructor Destroy; override;
+    procedure doRun; override;
+  end;
+
+function TMyApplication.InitEnv(aValue: JSValue): JSValue;
+
+Type
+  TAdd = Function (a,b : integer) : integer;
+
+
+Var
+  Module : TJSInstantiateResult absolute aValue;
+  exps : TWASIExports;
+  F : Tadd;
+  a : integer;
+begin
+  Result:=True;
+  Exps := TWASIExports(TJSObject(Module.Instance.exports_));
+  FWasiEnv.Instance:=Module.Instance;
+  Exps.initialize;
+  f:=TAdd(Exps['add']);
+  a:=F(2,3);
+  Writeln('Adding 2+3: ',a,' (expected: ',4711+2+3,')');
+end;
+
+procedure TMyApplication.DoWrite(Sender: TObject; const aOutput: String);
+begin
+  Writeln(aOutput);
+end;
+
+constructor TMyApplication.Create(aOwner: TComponent);
+begin
+  inherited Create(aOwner);
+  FWasiEnv:=TPas2JSWASIEnvironment.Create;
+  FWasiEnv.OnStdErrorWrite:=@DoWrite;
+  FWasiEnv.OnStdOutputWrite:=@DoWrite;
+end;
+
+function TMyApplication.CreateWebAssembly(Path: string; ImportObject: TJSObject): TJSPromise;
+
+begin
+  Result:=window.fetch(Path)._then(Function (res : jsValue) : JSValue
+    begin
+      Result:=TJSResponse(Res).arrayBuffer._then(Function (res2 : jsValue) : JSValue
+        begin
+          Result:=TJSWebAssembly.instantiate(TJSArrayBuffer(res2),ImportObject);
+        end,Nil)
+    end,Nil
+  );
+ end;
+
+procedure TMyApplication.InitWebAssembly;
+
+Var
+  mDesc : TJSWebAssemblyMemoryDescriptor;
+  tDesc: TJSWebAssemblyTableDescriptor;
+  ImportObj : TJSObject;
+
+begin
+  //  Setup memory
+  mDesc.initial:=256;
+  mDesc.maximum:=256;
+  FMemory:=TJSWebAssemblyMemory.New(mDesc);
+  // Setup table
+  tDesc.initial:=0;
+  tDesc.maximum:=0;
+  tDesc.element:='anyfunc';
+  FTable:=TJSWebAssemblyTable.New(tDesc);
+  // Setup ImportObject
+  ImportObj:=new([
+    'js', new([
+      'mem', FMemory,
+      'tbl', FTable
+    ])
+  ]);
+  FWasiEnv.AddImports(ImportObj);
+  CreateWebAssembly('libadd.wasm',ImportObj)._then(@initEnv)
+end;
+
+
+destructor TMyApplication.Destroy;
+begin
+  FreeAndNil(FWasiEnv);
+  inherited Destroy;
+end;
+
+procedure TMyApplication.doRun;
+
+begin
+  // Your code here
+  Terminate;
+  InitWebAssembly;
+end;
+
+var
+  Application : TMyApplication;
+
+begin
+  Application:=TMyApplication.Create(nil);
+  Application.Initialize;
+  Application.Run;
+end.

demo/wasienv/library/index.html

@@ -0,0 +1,49 @@
+
+<!doctype html>
+<html lang="en">
+<head>
+  <meta http-equiv="Content-type" content="text/html; charset=utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>FPC-Webassembly library and Pas2JS Demo</title>
+  <link href="bulma.min.css" rel="stylesheet">
+  <!-- <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@0.9.3/css/bulma.min.css"> -->
+  <script src="demolibadd.js"></script>
+  <style>
+
+  .source {
+    /* width: 730px; */
+    margin: -45px auto;
+    font-size: 0.9em;
+  }
+
+  .source-inner {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    /* width: 482px; */
+  }
+  </style>
+</head>
+<body>
+  <div class="section pb-4">
+    <h1 class="title is-4">FPC compiled wasm library output:</h1>
+    <div class="box" id="pasjsconsole"></div>
+  </div>
+  <!-- <hr> -->
+  <div class="section">
+    <div class="source">
+      <div class="source-inner">
+        <div>
+          <p>Created using &nbsp; <a target="_blank" href="https://wiki.freepascal.org/pas2js">pas2js.</a> </p>
+          <p>Pas2JS Sources: &nbsp; <a target="new" href="demowasienv.lpr">Pas2JS Program</a></p>
+          <p>Webassembly Sources: &nbsp; <a target="new" href="helloworld.pp">FPC Program</a></p>
+        </div>
+      </div>
+    </div>
+  </div>
+  <script>
+    rtl.showUncaughtExceptions=true;
+    rtl.run();
+  </script>
+</body>
+</html>

demo/wasienv/library/libadd.pp

@@ -0,0 +1,38 @@
+
+// ppcrosswasm32 -Twasi -oadd.wasm add.pas
+library libadd;
+
+{$mode objfpc}
+
+type
+   TConnection = class
+   private
+     n : Integer;
+   public
+     constructor Create;
+     function DoAdd(a1,a2 : integer) : Integer;
+   end;
+
+constructor TConnection.Create;
+begin
+   n := 4711;
+end;
+
+function TConnection.Doadd( a1, a2 : Integer ) : Integer;
+
+begin
+  result:=a1+a2+n;
+end;
+
+function add( a1, a2 : Integer ) : Integer;
+var
+   connection : TConnection;
+begin
+   connection := TConnection.Create;
+   Result := connection.DoAdd(a1,a2);
+   connection.free;
+end;
+
+exports
+   add name 'add';
+end.

demo/wasienv/wasienvdemos.lpg

@@ -27,6 +27,11 @@
           <Mode Name="Default"/>
         </BuildModes>
       </Target>
+      <Target FileName="library/demolibadd.lpi">
+        <BuildModes>
+          <Mode Name="Default"/>
+        </BuildModes>
+      </Target>
     </Targets>
   </ProjectGroup>
 </CONFIG>