path: root/src/parseTools.js

// Various tools for parsing LLVM. Utilities of various sorts, that are
// specific to Emscripten (and hence not in utility.js).

// 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);
    var ret = eval(str);
    if (ret !== undefined) ret = ret.toString();
    return ret;
  });
}

// Simple #if/else/endif preprocessing for a file. Checks if the
// ident checked is true in our global. Also replaces some constants.
function preprocess(text, constants) {
  for (var constant in constants) {
    text = text.replace(eval('/' + constant + '/g'), constants[constant]);
  }
  var lines = text.split('\n');
  var ret = '';
  var showStack = [];
  for (var i = 0; i < lines.length; i++) {
    var line = lines[i];
    if (!line[0] || line[0] != '#') {
      if (showStack.indexOf(false) == -1) {
        ret += line + '\n';
      }
    } else {
      if (line[1] && line[1] == 'i') { // if
        var parts = line.split(' ');
        var ident = parts[1];
        var op = parts[2];
        var value = parts[3];
        if (op) {
          assert(op === '==')
          showStack.push(ident in this && this[ident] == value