tour - touring some programming systems

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//: Calls can take ingredients just like primitives. To access a recipe's //: ingredients, use 'next-ingredient'. :(scenario next_ingredient) recipe main [ f 2 ] recipe f [ 12:number <- next-ingredient 13:number <- add 1, 12:number ] +mem: storing 3 in location 13 :(scenario next_ingredient_missing) recipe main [ f ] recipe f [ _, 12:number <- next-ingredient ] +mem: storing 0 in location 12 :(before "End call Fields") vector<vector<double> > ingredient_atoms; long long int next_ingredient_to_process; :(before "End call Constructor") next_ingredient_to_process = 0; :(after "call_housekeeping:") for (long long int i = 0; i < SIZE(ingredients); ++i) { Current_routine->calls.front().ingredient_atoms.push_back(ingredients.at(i)); } :(before "End Primitive Recipe Declarations") NEXT_INGREDIENT, :(before "End Primitive Recipe Numbers") Recipe_ordinal["next-ingredient"] = NEXT_INGREDIENT; :(before "End Primitive Recipe Implementations") case NEXT_INGREDIENT: { if (!ingredients.empty()) { raise << current_recipe_name() << ": 'next-ingredient' didn't expect any ingredients in '" << current_instruction().to_string() << "'\n" << end(); break; } assert(!Current_routine->calls.empty()); if (Current_routine->calls.front().next_ingredient_to_process < SIZE(Current_routine->calls.front().ingredient_atoms)) { products.push_back( Current_routine->calls.front().ingredient_atoms.at(Current_routine->calls.front().next_ingredient_to_process)); assert(SIZE(products) == 1); products.resize(2); // push a new vector products.at(1).push_back(1); ++Current_routine->calls.front().next_ingredient_to_process; } else { products.resize(2); products.at(0).push_back(0); // todo: will fail noisily if we try to read a compound value products.at(1).push_back(0); } break; } :(scenario rewind_ingredients) recipe main [ f 2 ] recipe f [ 12:number <- next-ingredient # consume ingredient _, 1:boolean <- next-ingredient # will not find any ingredients rewind-ingredients 13:number, 2:boolean <- next-ingredient # will find ingredient again ] +mem: storing 2 in location 12 +mem: storing 0 in location 1 +mem: storing 2 in location 13 +mem: storing 1 in location 2 :(before "End Primitive Recipe Declarations") REWIND_INGREDIENTS, :(before "End Primitive Recipe Numbers") Recipe_ordinal["rewind-ingredients"] = REWIND_INGREDIENTS; :(before "End Primitive Recipe Implementations") case REWIND_INGREDIENTS: { Current_routine->calls.front().next_ingredient_to_process = 0; break; } :(scenario ingredient) recipe main [ f 1, 2 ] recipe f [ 12:number <- ingredient 1 # consume second ingredient first 13:number, 1:boolean <- next-ingredient # next-ingredient tries to scan past that ] +mem: storing 2 in location 12 +mem: storing 0 in location 1 :(before "End Primitive Recipe Declarations") INGREDIENT, :(before "End Primitive Recipe Numbers") Recipe_ordinal["ingredient"] = INGREDIENT; :(before "End Primitive Recipe Implementations") case INGREDIENT: { if (SIZE(ingredients) != 1) { raise << current_recipe_name() << ": 'ingredient' expects exactly one ingredient, but got '" << current_instruction().to_string() << "'\n" << end(); break; } if (!is_literal(current_instruction().ingredients.at(0))) { raise << current_recipe_name() << ": 'ingredient' expects a literal ingredient, but got " << current_instruction().ingredients.at(0).original_string << '\n' << end(); break; } assert(scalar(ingredients.at(0))); if (static_cast<long long int>(ingredients.at(0).at(0)) < SIZE(Current_routine->calls.front().ingredient_atoms)) { Current_routine->calls.front().next_ingredient_to_process = ingredients.at(0).at(0); products.push_back( Current_routine->calls.front().ingredient_atoms.at(Current_routine->calls.front().next_ingredient_to_process)); assert(SIZE(products) == 1); products.resize(2); // push a new vector products.at(1).push_back(1); ++Current_routine->calls.front().next_ingredient_to_process; } else { if (SIZE(current_instruction().products) > 1) { products.resize(2); products.at(0).push_back(0); // todo: will fail noisily if we try to read a compound value products.at(1).push_back(0); } } break; }


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