//: Phase 1 of running Mu code: load it from a textual representation.
//:
//: The process of running Mu code:
//:   load -> transform -> run

:(scenarios load)  // use 'load' instead of 'run' in all scenarios in this layer
:(scenario first_recipe)
def main [
  1:number <- copy 23
]
+parse: instruction: copy
+parse:   ingredient: {23: "literal"}
+parse:   product: {1: "number"}

:(code)
vector<recipe_ordinal> load(string form) {
  istringstream in(form);
  in >> std::noskipws;
  return load(in);
}

vector<recipe_ordinal> load(istream& in) {
  in >> std::noskipws;
  vector<recipe_ordinal> result;
  while (has_data(in)) {
    skip_whitespace_and_comments(in);
    if (!has_data(in)) break;
    string command = next_word(in);
    if (command.empty()) {
      assert(!has_data(in));
      break;
    }
    // Command Handlers
    if (command == "recipe" || command == "def") {
      recipe_ordinal r = slurp_recipe(in);
      if (r > 0) result.push_back(r);
    }
    else if (command == "recipe!" || command == "def!") {
      Disable_redefine_checks = true;
      recipe_ordinal r = slurp_recipe(in);
      if (r > 0) result.push_back(r);
      Disable_redefine_checks = false;
    }
    // End Command Handlers
    else {
      raise << "unknown top-level command: " << command << '\n' << end();
    }
  }
  return result;
}

// return the recipe ordinal slurped, or -1 if it failed
int slurp_recipe(istream& in) {
  recipe result;
  result.name = next_word(in);
  if (result.name.empty()) {
    assert(!has_data(in));
    raise << "file ended with 'recipe'\n" << end();
    return -1;
  }
  // End Load Recipe Name
  skip_whitespace_but_not_newline(in);
  // End Recipe Refinements
  if (result.name.empty())
    raise << "empty result.name\n" << end();
  trace(9991, "parse") << "--- defining " << result.name << end();
  if (!contains_key(Recipe_ordinal, result.name))
    put(Recipe_ordinal, result.name, Next_recipe_ordinal);
  result.ordinal = get(Recipe_ordinal, result.name);
  ++Next_recipe_ordinal;
  if (Recipe.find(get(Recipe_ordinal, result.name)) != Recipe.end()) {
    trace(9991, "parse") << "already exists" << end();
    if (should_check_for_redefine(result.name))
      raise << "redefining recipe " << result.name << "\n" << end();
    Recipe.erase(get(Recipe_ordinal, result.name));
  }
  slurp_body(in, result);
  // End Recipe Body(result)
  put(Recipe, get(Recipe_ordinal, result.name), result);
  return get(Recipe_ordinal, result.name);
}

void slurp_body(istream& in, recipe& result) {
  in >> std::noskipws;
  skip_whitespace_but_not_newline(in);
  if (in.get() != '[')
    raise << result.name << ": recipe body must begin with '['\n" << end();
  skip_whitespace_and_comments(in);  // permit trailing comment after '['
  instruction curr;
  while (next_instruction(in, &curr)) {
    curr.original_string = to_original_string(curr);
    // End Rewrite Instruction(curr, recipe result)
    trace(9992, "load") << "after rewriting: " << to_string(curr) << end();
    if (!curr.is_empty()) result.steps.push_back(curr);
  }
}

bool next_instruction(istream& in, instruction* curr) {
  curr->clear();
  skip_whitespace_and_comments(in);
  if (!has_data(in)) {
    raise << "incomplete recipe at end of file (0)\n" << end();
    return false;
  }

  vector<string> words;
  while (has_data(in) && in.peek() != '\n') {
    skip_whitespace_but_not_newline(in);
    if (!has_data(in)) {
      raise << "incomplete recipe at end of file (1)\n" << end();
      return false;
    }
    string word = next_word(in);
    if (word.empty()) {
      assert(!has_data(in));
      raise << "incomplete recipe at end of file (2)\n" << end();
      return false;
    }
    words.push_back(word);
    skip_whitespace_but_not_newline(in);
  }
  skip_whitespace_and_comments(in);
  if (SIZE(words) == 1 && words.at(0) == "]")
    return false;  // end of recipe

  if (SIZE(words) == 1 && is_label_word(words.at(0))) {
    curr->is_label = true;
    curr->label = words.at(0);
    trace(9993, "parse") << "label: " << curr->label << end();
    if (!has_data(in)) {
      raise << "incomplete recipe at end of file (3)\n" << end();
      return false;
    }
    return true;
  }

  vector<string>::iterator p = words.begin();
  if (find(words.begin(), words.end(), "<-") != words.end()) {
    for (;  *p != "<-";  ++p)
      curr->products.push_back(reagent(*p));
    ++p;  // skip <-
  }

  if (p == words.end()) {
    raise << "instruction prematurely ended with '<-'\n" << end();
    return false;
  }
  curr->name = *p;  ++p;
  // curr->operation will be set at transform time

  for (;  p != words.end();  ++p)
    curr->ingredients.push_back(reagent(*p));

  trace(9993, "parse") << "instruction: " << curr->name << end();
  trace(9993, "parse") << "  number of ingredients: " << SIZE(curr->ingredients) << end();
  for (vector<reagent>::iterator p = curr->ingredients.begin();  p != curr->ingredients.end();  ++p)
    trace(9993, "parse") << "  ingredient: " << to_string(*p) << end();
  for (vector<reagent>::iterator p = curr->products.begin();  p != curr->products.end();  ++p)
    trace(9993, "parse") << "  product: " << to_string(*p) << end();
  if (!has_data(in)) {
    raise << "9: unbalanced '[' for recipe\n" << end();
    return false;
  }
  // End next_instruction(curr)
  return true;
}

// can return empty string -- only if 'in' has no more data
string next_word(istream& in) {
  skip_whitespace_but_not_newline(in);
  // End next_word Special-cases
  ostringstream out;
  slurp_wor<style>pre { line-height: 125%; }
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.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */</style><div class="highlight"><pre><span></span>0.6.0
=====

- Allow moving vertical window positions (/titlebar, /mainwin, /statusbar, /inputwin)
- Allow loading/unloading all pluguns (/plugins)
- Allow installing plugins from directory (/plugins)
- Theme option for status bar time (statusbar.time)
- Case/accent insensitive autocompletion
- Shift tab to select previous autocomplete suggestion
- Allow searching help (/hel