path: root/src/jsifier.js

//"use strict";

// Convert analyzed data to javascript. Everything has already been calculated
// before this stage, which just does the final conversion to JavaScript.

// Handy sets

var STRUCT_LIST = set('struct', 'list');
var UNDERSCORE_OPENPARENS = set('_', '(');
var RELOOP_IGNORED_LASTS = set('return', 'unreachable', 'resume');

// JSifier
function JSify(data, functionsOnly, givenFunctions) {
  var mainPass = !functionsOnly;

  if (mainPass) {
    var shellFile = SHELL_FILE ? SHELL_FILE : (BUILD_AS_SHARED_LIB ? 'shell_sharedlib.js' : 'shell.js');

    if (phase == 'pre') {
      // We will start to print out the data, but must do so carefully - we are
      // dealing with potentially *huge* strings. Convenient replacements and
      // manipulations may create in-memory copies, and we may OOM.
      //
      // Final shape that will be created:
      //    shell
      //      (body)
      //        preamble
      //          runtime
      //        generated code
      //        postamble
      //          global_vars
      //
      // First, we print out everything until the generated code. Then the
      // functions will print themselves out as they are parsed. Finally, we
      // will call finalCombiner in the main pass, to print out everything
      // else. This lets us not hold any strings in memory, we simply print
      // things out as they are ready.

      var shellParts = read(shellFile).split('{{BODY}}');
      print(shellParts[0]);
      var preFile = BUILD_AS_SHARED_LIB ? 'preamble_sharedlib.js' : 'preamble.js';
      var pre = processMacros(preprocess(read(preFile).replace('{{RUNTIME}}', getRuntime())));
      print(pre);

      Functions.implementedFunctions = set(data.unparsedFunctions.map(function(func) { return func.ident }));
    }
  }

  // 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 substrate = new Substrate('JSifyer');

  if (mainPass) {
    // Handle unparsed types TODO: Batch them
    analyzer(intertyper(data.unparsedTypess[0].lines, true), true<