mu - Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Mu - 056recipe_header.cc</title> <meta name="Generator" content="Vim/7.4"> <meta name="plugin-version" content="vim7.4_v1"> <meta name="syntax" content="cpp"> <meta name="settings" content="use_css,pre_wrap,no_foldcolumn,expand_tabs,prevent_copy="> <meta name="colorscheme" content="minimal"> <style type="text/css">  </style> <script type='text/javascript'>  </script> </head> <body> <pre id='vimCodeElement'> //: Advanced notation for the common/easy case where a recipe takes some fixed //: number of ingredients and yields some fixed number of products. :(scenario recipe_with_header) recipe main [ 1:number/raw <- add2 3, 5 ] recipe add2 x:number, y:number -> z:number [ local-scope load-ingredients z:number <- add x, y reply z ] +mem: storing 8 in location 1 //: When loading recipes save any header. :(before "End recipe Fields") bool has_header; vector<reagent> ingredients; vector<reagent> products; :(before "End recipe Constructor") has_header = false; :(before "End recipe Refinements") skip_whitespace(in); if (in.peek() != '[') { trace(9999, "parse") << "recipe has a header; parsing" << end(); load_recipe_header(in, result); } :(code) void load_recipe_header(istream& in, recipe& result) { result.has_header = true; while (in.peek() != '[') { string s = next_word(in); if (s == "->") break; result.ingredients.push_back(reagent(s)); trace(9999, "parse") << "header ingredient: " << result.ingredients.back().original_string << end(); skip_whitespace_and_comments(in); } while (in.peek() != '[') { string s = next_word(in); result.products.push_back(reagent(s)); trace(9999, "parse") << "header product: " << result.products.back().original_string << end(); skip_whitespace_and_comments(in); } // End Load Recipe Header(result) } :(scenario recipe_handles_stray_comma) recipe main [ 1:number/raw <- add2 3, 5 ] recipe add2 x:number, y:number -> z:number, [ local-scope load-ingredients z:number <- add x, y reply z ] +mem: storing 8 in location 1 :(scenario recipe_handles_stray_comma_2) recipe main [ foo ] recipe foo, [ 1:number/raw <- add 2, 2 ] recipe bar [ 1:number/raw <- add 2, 3 ] +mem: storing 4 in location 1 :(after "Begin debug_string(recipe x)") out << "ingredients:\n"; for (long long int i = 0; i < SIZE(x.ingredients); ++i) out << " " << debug_string(x.ingredients.at(i)) << '\n'; out << "products:\n"; for (long long int i = 0; i < SIZE(x.products); ++i) out << " " << debug_string(x.products.at(i)) << '\n'; //: If a recipe never mentions any ingredients or products, assume it has a header. :(scenario recipe_without_ingredients_or_products_has_header) recipe test [ 1:number <- copy 34 ] +parse: recipe test has a header :(before "End recipe Body(result)") if (!result.has_header) { result.has_header = true; for (long long int i = 0; i < SIZE(result.steps); ++i) { const instruction& inst = result.steps.at(i); if ((inst.name == "reply" && !inst.ingredients.empty()) || inst.name == "next-ingredient" || inst.name == "ingredient" || inst.name == "rewind-ingredients") { result.has_header = false; break; } } } if (result.has_header) { trace(9999, "parse") << "recipe " << result.name << " has a header" << end(); } //: Rewrite 'load-ingredients' to instructions to create all reagents in the header. :(before "End Rewrite Instruction(curr, recipe result)") if (curr.name == "load-ingredients") { curr.clear(); for (long long int i = 0; i < SIZE(result.ingredients); ++i) { curr.operation = get(Recipe_ordinal, "next-ingredient"); curr.name = "next-ingredient"; curr.products.push_back(result.ingredients.at(i)); result.steps.push_back(curr); curr.clear(); } } //:: Check types going in and out of all recipes with headers. :(scenarios transform) :(scenario recipe_headers_are_checked) % Hide_errors = true; recipe add2 x:number, y:number -> z:number [ local-scope load-ingredients z:address:number <- copy 0/unsafe reply z ] +error: add2: replied with the wrong type at 'reply z' :(before "End Checks") Transform.push_back(check_reply_instructions_against_header); // idempotent :(code) void check_reply_instructions_against_header(const recipe_ordinal r) { const recipe& caller_recipe = get(Recipe, r); if (caller_recipe.products.empty()) return; trace(9991, "transform") << "--- checking reply instructions against header for " << caller_recipe.name << end(); //? cerr << "--- checking reply instructions against header for " << caller_recipe.name << '\n'; for (long long int i = 0; i < SIZE(caller_recipe.steps); ++i) { const instruction& inst = caller_recipe.steps.at(i); if (inst.name != "reply") continue; for (long long int i = 0; i < SIZE(inst.ingredients); ++i) { if (!types_match(caller_recipe.products.at(i), inst.ingredients.at(i))) raise_error << maybe(caller_recipe.name) << "replied with the wrong type at '" << inst.to_string() << "'\n" << end(); } } } :(scenario recipe_headers_check_for_duplicate_names) % Hide_errors = true; recipe add2 x:number, x:number -> z:number [ local-scope load-ingredients reply z ] +error: add2: x can't repeat in the ingredients :(before "End recipe Fields") map<string, int> ingredient_index; :(after "Begin Instruction Modifying Transforms") Transform.push_back(check_header_ingredients); // idempotent :(code) void check_header_ingredients(const recipe_ordinal r) { recipe& caller_recipe = get(Recipe, r); if (caller_recipe.products.empty()) return; trace(9991, "transform") << "--- checking reply instructions against header for " << caller_recipe.name << end(); for (long long int i = 0; i < SIZE(caller_recipe.ingredients); ++i) { if (contains_key(caller_recipe.ingredient_index, caller_recipe.ingredients.at(i).name)) raise_error << maybe(caller_recipe.name) << caller_recipe.ingredients.at(i).name << " can't repeat in the ingredients\n" << end(); put(caller_recipe.ingredient_index, caller_recipe.ingredients.at(i).name, i); } } //: Deduce types from the header if possible. :(scenarios run) :(scenario deduce_instruction_types_from_recipe_header) recipe main [ 1:number/raw <- add2 3, 5 ] recipe add2 x:number, y:number -> z:number [ local-scope load-ingredients z <- add x, y # no type for z reply z ] +mem: storing 8 in location 1 :(after "Begin Type Modifying Transforms") Transform.push_back(deduce_types_from_header); // idempotent :(code) void deduce_types_from_header(const recipe_ordinal r) { recipe& caller_recipe = get(Recipe, r); if (caller_recipe.products.empty()) return; trace(9991, "transform") << "--- deduce types from header for " << caller_recipe.name << end(); //? cerr << "--- deduce types from header for " << caller_recipe.name << '\n'; map<string, const type_tree*> header_type; map<string, const string_tree*> header_type_name; for (long long int i = 0; i < SIZE(caller_recipe.ingredients); ++i) { put(header_type, caller_recipe.ingredients.at(i).name, caller_recipe.ingredients.at(i).type); put(header_type_name, caller_recipe.ingredients.at(i).name, caller_recipe.ingredients.at(i).properties.at(0).second); trace(9993, "transform") << "type of " << caller_recipe.ingredients.at(i).name << " is " << debug_string(caller_recipe.ingredients.at(i).type) << end(); } for (long long int i = 0; i < SIZE(caller_recipe.products); ++i) { put(header_type, caller_recipe.products.at(i).name, caller_recipe.products.at(i).type); put(header_type_name, caller_recipe.products.at(i).name, caller_recipe.products.at(i).properties.at(0).second); trace(9993, "transform") << "type of " << caller_recipe.products.at(i).name << " is " << debug_string(caller_recipe.products.at(i).type) << end(); } for (long long int i = 0; i < SIZE(caller_recipe.steps); ++i) { instruction& inst = caller_recipe.steps.at(i); trace(9992, "transform") << "instruction: " << inst.to_string() << end(); for (long long int i = 0; i < SIZE(inst.ingredients); ++i) { if (inst.ingredients.at(i).type) continue; if (header_type.find(inst.ingredients.at(i).name) == header_type.end()) { raise << maybe(caller_recipe.name) << "unknown variable " << inst.ingredients.at(i).name << " in '" << inst.to_string() << "'\n" << end(); continue; } if (!inst.ingredients.at(i).type) inst.ingredients.at(i).type = new type_tree(*get(header_type, inst.ingredients.at(i).name)); if (!inst.ingredients.at(i).properties.at(0).second) inst.ingredients.at(i).properties.at(0).second = new string_tree(*get(header_type_name, inst.ingredients.at(i).name)); trace(9993, "transform") << "type of " << inst.ingredients.at(i).name << " is " << debug_string(inst.ingredients.at(i).type) << end(); } for (long long int i = 0; i < SIZE(inst.products); ++i) { trace(9993, "transform") << " product: " << debug_string(inst.products.at(i)) << end(); if (inst.products.at(i).type) continue; if (header_type.find(inst.products.at(i).name) == header_type.end()) { raise << maybe(caller_recipe.name) << "unknown variable " << inst.products.at(i).name << " in '" << inst.to_string() << "'\n" << end(); continue; } if (!inst.products.at(i).type) inst.products.at(i).type = new type_tree(*get(header_type, inst.products.at(i).name)); if (!inst.products.at(i).properties.at(0).second) inst.products.at(i).properties.at(0).second = new string_tree(*get(header_type_name, inst.products.at(i).name)); trace(9993, "transform") << "type of " << inst.products.at(i).name << " is " << debug_string(inst.products.at(i).type) << end(); } } } //: One final convenience: no need to say what to return if the information is //: in the header. :(scenario reply_based_on_header) recipe main [ 1:number/raw <- add2 3, 5 ] recipe add2 x:number, y:number -> z:number [ local-scope load-ingredients z <- add x, y reply ] +mem: storing 8 in location 1 :(after "Transform.push_back(check_header_ingredients)") Transform.push_back(fill_in_reply_ingredients); // idempotent :(code) void fill_in_reply_ingredients(recipe_ordinal r) { recipe& caller_recipe = get(Recipe, r); if (!caller_recipe.has_header) return; trace(9991, "transform") << "--- fill in reply ingredients from header for recipe " << caller_recipe.name << end(); for (long long int i = 0; i < SIZE(caller_recipe.steps); ++i) { instruction& inst = caller_recipe.steps.at(i); if (inst.name == "reply" && inst.ingredients.empty()) add_header_products(inst, caller_recipe); } // fall through reply if (caller_recipe.steps.at(SIZE(caller_recipe.steps)-1).name != "reply") { instruction inst; inst.name = "reply"; add_header_products(inst, caller_recipe); caller_recipe.steps.push_back(inst); } } void add_header_products(instruction& inst, const recipe& caller_recipe) { assert(inst.name == "reply"); // collect any products with the same names as ingredients for (long long int i = 0; i < SIZE(caller_recipe.products); ++i) { // if the ingredient is missing, add it from the header if (SIZE(inst.ingredients) == i) inst.ingredients.push_back(caller_recipe.products.at(i)); // if it's missing /same_as_ingredient, try to fill it in if (contains_key(caller_recipe.ingredient_index, caller_recipe.products.at(i).name) && !has_property(inst.ingredients.at(i), "same_as_ingredient")) { ostringstream same_as_ingredient; same_as_ingredient << get(caller_recipe.ingredient_index, caller_recipe.products.at(i).name); inst.ingredients.at(i).properties.push_back(pair<string, string_tree*>("same-as-ingredient", new string_tree(same_as_ingredient.str()))); } } } :(scenario explicit_reply_ignores_header) recipe main [ 1:number/raw, 2:number/raw <- add2 3, 5 ] recipe add2 a:number, b:number -> y:number, z:number [ local-scope load-ingredients y <- add a, b z <- subtract a, b reply a, z ] +mem: storing 3 in location 1 +mem: storing -2 in location 2 :(scenario reply_on_fallthrough_based_on_header) recipe main [ 1:number/raw <- add2 3, 5 ] recipe add2 x:number, y:number -> z:number [ local-scope load-ingredients z <- add x, y ] +transform: instruction: reply z:number +mem: storing 8 in location 1 :(scenario reply_on_fallthrough_already_exists) recipe main [ 1:number/raw <- add2 3, 5 ] recipe add2 x:number, y:number -> z:number [ local-scope load-ingredients z <- add x, y # no type for z reply z ] +transform: instruction: reply z -transform: instruction: reply z:number +mem: storing 8 in location 1 :(scenario recipe_headers_perform_same_ingredient_check) % Hide_errors = true; recipe main [ 1:number <- copy 34 2:number <- copy 34 3:number <- add2 1:number, 2:number ] recipe add2 x:number, y:number -> x:number [ local-scope load-ingredients ] +error: main: '3:number <- add2 1:number, 2:number' should write to 1:number rather than 3:number </pre> </body> </html>


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