simple django-style substitution/macros

src/jsifier.js

@@ -110,9 +110,10 @@ function JSify(data, functionsOnly, givenTypes, givenFunctions, givenGlobalVaria
     value = indexizeFunctions(value);
     var offset = calcFastOffset(ptr, pos, noNeedFirst);
     if (SAFE_HEAP) {
-      return 'SAFE_HEAP_STORE(' + offset + ', ' + value + ', "' + safeQuote(type) + '")';
+      if (type !== 'null') type = '"' + safeQuote(type) + '"';
+      return 'SAFE_HEAP_STORE(' + offset + ', ' + value + ', ' + type + ');';
     } else {
-      return makeGetSlabs(ptr, type, true).map(function(slab) { return slab + '[' + offset + '] = ' + value }).join('; ');
+      return makeGetSlabs(ptr, type, true).map(function(slab) { return slab + '[' + offset + '] = ' + value }).join('; ') + ';';
     }
   }
 
@@ -964,6 +965,15 @@ function JSify(data, functionsOnly, givenTypes, givenFunctions, givenGlobalVaria
   // Final combiner
 
   function finalCombiner(items) {
+    // Does simple 'macro' substitution, using Django-like syntax,
+    // {{{ code }}} will be replaced with |eval(code)|.
+    function processMacros(text) {
+      return text.replace(/{{{[^}]+}}}/g, function(str) {
+        str = str.substr(3, str.length-6);
+        return eval(str).toString();
+      });
+    }
+
     var ret = [];
     if (!functionsOnly) {
       ret = ret.concat(items.filter(function(item) { return item.intertype == 'type' }));
@@ -982,8 +992,10 @@ function JSify(data, functionsOnly, givenTypes, givenFunctions, givenGlobalVaria
     var body = preprocess(read('preamble.js').replace('{{RUNTIME}}', getRuntime()) + ret + read('postamble.js'), CONSTANTS);
     var globalVars = items.filter(function(item) { return item.intertype == 'GlobalVariable' }).map(function(item) { return item.JS }).join('\n');
     var globalVarsPostSets = items.filter(function(item) { return item.intertype == 'GlobalVariablePostSet' }).map(function(item) { return item.JS }).join('\n');
-    return read('shell.js').replace('{{BODY}}', indentify(body, 2))
-                           .replace('{{GLOBAL_VARS}}', indentify(globalVars+'\n\n\n'+globalVarsPostSets, 4));
+    return processMacros(
+      read('shell.js').replace('{{BODY}}', indentify(body, 2))
+                      .replace('{{GLOBAL_VARS}}', indentify(globalVars+'\n\n\n'+globalVarsPostSets, 4))
+    );
   }
 
   // Data

src/parseTools.js

@@ -2,7 +2,7 @@
 // specific to Emscripten (and hence not in utility.js).
 
 // Simple #if/else/endif preprocessing for a file. Checks if the
-// ident checked is true in our global. Also replaces some constants
+// ident checked is true in our global. Also replaces some constants.
 function preprocess(text, constants) {
   for (constant in constants) {
     text = text.replace(eval('/' + constant + '/g'), constants[constant]);

src/preamble.js

@@ -138,21 +138,8 @@ function Pointer_make(slab, pos, allocator) {
     if (typeof curr === 'function') {
       curr = Runtime.getFunctionIndex(curr);
     }
-#if SAFE_HEAP
-    SAFE_HEAP_STORE(ret + i, curr, null);
-#else
-#if USE_TYPED_ARRAYS
-    // TODO: Check - also in non-typedarray case - for functions, and if so add |.__index__|
-    if (typeof curr === 'number' || typeof curr === 'boolean') {
-      IHEAP[ret + i] = curr; // TODO: optimize. Can easily detect floats, but 1.0 might look like an int...
-      FHEAP[ret + i] = curr;
-    } else {
-      HEAP[ret + i] = curr;
-    }
-#else
-    HEAP[ret + i] = curr;
-#endif
-#endif
+
+    {{{ makeSetValue(0, 'ret+i', 'curr', null, 'null') }}}
   }
 
   return ret;