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//: Some instructions can take string literals for convenience.
//:
//: Instead of quotes, we'll use [] to delimit strings. That'll reduce the
//: need for escaping since we can support nested brackets. And we can also
//: imagine that 'recipe' might one day itself be defined in mu, doing its own
//: parsing.
//: First extend the mu parser to support string literals.
:(scenario "string_literal")
recipe main [
1:address:array:character <- new [abc def]
]
+parse: ingredient: {name: "abc def", value: 0, type: 0, properties: ["abc def": "literal-string"]}
:(before "End Mu Types Initialization")
Type_number["literal-string"] = 0;
:(after "string next_word(istream& in)")
if (in.peek() == '[') return slurp_quoted(in);
:(code)
string slurp_quoted(istream& in) {
assert(!in.eof());
assert(in.get() == '[');
ostringstream out;
int size = 1;
while (!in.eof()) {
char c = in.get();
if (c == '[') ++size;
if (c == ']') --size;
if (size == 0) break;
//? cout << c << '\n'; //? 1
out << c;
//? cout << out.str() << "$\n"; //? 1
}
return out.str();
}
:(scenario "string_literal_nested")
recipe main [
1:address:array:character <- new [abc [def]]
]
+parse: ingredient: {name: "abc [def]", value: 0, type: 0, properties: ["abc [def]": "literal-string"]}
//: Next, extend 'new' to handle a string literal argument.
:(scenario "new_string")
recipe main [
1:address:array:character <- new [abc def]
2:character <- index 1:address:array:character/deref, 5:literal
]
# integer code for 'e'
+mem: storing 101 in location 2
:(before "End Mu Types Initialization")
Type_number["character"] = Next_type_number++;
:(after "case NEW" following "Primitive Recipe Implementations")
if (instructions[pc].ingredients[0].properties[0].second[0] == "literal-string") {
// allocate an array just large enough for it
vector<int> result;
result.push_back(Current_routine.alloc);
write_memory(instructions[pc].products[0], result);
// assume that all characters fit in a single location
//? cout << "new string literal: " << instructions[pc].ingredients[0].name << '\n'; //? 1
Memory[Current_routine.alloc++] = instructions[pc].ingredients[0].name.size();
for (size_t i = 0; i < instructions[pc].ingredients[0].name.size(); ++i) {
Memory[Current_routine.alloc++] = instructions[pc].ingredients[0].name[i];
}
// mu strings are not null-terminated in memory
break;
}
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