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//: Extend 'new' to handle a unicode string literal argument or 'text'.
//: A Mu text is an address to an array of characters.
:(before "End Mu Types Initialization")
put(Type_abbreviations, "text", new_type_tree("address:array:character"));
:(scenario new_string)
def main [
1:text <- new [abc def]
2:char <- index *1:text, 5
]
# number code for 'e'
+mem: storing 101 in location 2
:(scenario new_string_handles_unicode)
def main [
1:text <- new [a«c]
2:num <- length *1:text
3:char <- index *1:text, 1
]
+mem: storing 3 in location 2
# unicode for '«'
+mem: storing 171 in location 3
:(before "End NEW Check Special-cases")
if (is_literal_text(inst.ingredients.at(0))) break;
:(before "Convert 'new' To 'allocate'")
if (inst.name == "new" && !inst.ingredients.empty() && is_literal_text(inst.ingredients.at(0))) continue;
:(after "case NEW" following "Primitive Recipe Implementations")
if (is_literal_text(current_instruction().ingredients.at(0))) {
products.resize(1);
products.at(0).push_back(new_mu_text(current_instruction().ingredients.at(0).name));
trace("mem") << "new string alloc: " << products.at(0).at(0) << end();
break;
}
:(code)
int new_mu_text(const string& contents) {
// allocate an array just large enough for it
int string_length = unicode_length(contents);
//? Total_alloc += string_length+1;
//? ++Num_alloc;
int result = allocate(string_length+/*array length*/1);
trace("mem") << "storing string refcount 0 in location " << result << end();
put(Memory, result, 0);
int curr_address = result+/*skip refcount*/1;
trace("mem") << "storing string length " << string_length << " in location " << curr_address << end();
put(Memory, curr_address, string_length);
++curr_address; // skip length
int curr = 0;
const char* raw_contents = contents.c_str();
for (int i = 0; i < string_length; ++i) {
uint32_t curr_character;
assert(curr < SIZE(contents));
tb_utf8_char_to_unicode(&curr_character, &raw_contents[curr]);
trace("mem") << "storing string character " << curr_character << " in location " << curr_address << end();
put(Memory, curr_address, curr_character);
curr += tb_utf8_char_length(raw_contents[curr]);
++curr_address;
}
// Mu strings are not null-terminated in memory.
return result;
}
//: a new kind of typo
:(scenario string_literal_without_instruction)
% Hide_errors = true;
def main [
[abc]
]
+error: main: instruction '[abc]' has no recipe in '[abc]'
//: stash recognizes strings
:(scenario stash_string)
def main [
1:text <- new [abc]
stash [foo:], 1:text
]
+app: foo: abc
:(before "End inspect Special-cases(r, data)")
if (is_mu_text(r)) {
assert(scalar(data));
return read_mu_text(data.at(0));
}
:(before "End $print Special-cases")
else if (is_mu_text(current_instruction().ingredients.at(i))) {
cout << read_mu_text(ingredients.at(i).at(0));
}
:(scenario unicode_string)
def main [
1:text <- new [♠]
stash [foo:], 1:text
]
+app: foo: ♠
:(scenario stash_space_after_string)
def main [
1:text <- new [abc]
stash 1:text, [foo]
]
+app: abc foo
:(scenario stash_string_as_array)
def main [
1:text <- new [abc]
stash *1:text
]
+app: 3 97 98 99
//: fixes way more than just stash
:(before "End Preprocess is_mu_text(reagent x)")
if (!canonize_type(x)) return false;
//: Allocate more to routine when initializing a literal string
:(scenario new_string_overflow)
% Initial_memory_per_routine = 3;
def main [
1:address:num/raw <- new number:type
2:text/raw <- new [a] # not enough room in initial page, if you take the refcount and array length into account
]
+new: routine allocated memory from 1000 to 1003
+new: routine allocated memory from 1003 to 1006
//: helpers
:(code)
int unicode_length(const string& s) {
const char* in = s.c_str();
int result = 0;
int curr = 0;
while (curr < SIZE(s)) { // carefully bounds-check on the string
// before accessing its raw pointer
++result;
curr += tb_utf8_char_length(in[curr]);
}
return result;
}
string read_mu_text(int address) {
if (address == 0) return "";
++address; // skip refcount
int length = get_or_insert(Memory, address);
if (length == 0) return "";
return read_mu_characters(address+1, length);
}
string read_mu_characters(int start, int length) {
ostringstream tmp;
for (int curr = start; curr < start+length; ++curr)
tmp << to_unicode(static_cast<uint32_t>(get_or_insert(Memory, curr)));
return tmp.str();
}
//:: some miscellaneous helpers now that we have text
//: assert: perform sanity checks at runtime
:(scenario assert)
% Hide_errors = true; // '%' lines insert arbitrary C code into tests before calling 'run' with the lines below. Must be immediately after :(scenario) line.
def main [
assert 0, [this is an assert in Mu]
]
+error: this is an assert in Mu
:(before "End Primitive Recipe Declarations")
ASSERT,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "assert", ASSERT);
:(before "End Primitive Recipe Checks")
case ASSERT: {
if (SIZE(inst.ingredients) != 2) {
raise << maybe(get(Recipe, r).name) << "'assert' takes exactly two ingredients rather than '" << to_original_string(inst) << "'\n" << end();
break;
}
if (!is_mu_scalar(inst.ingredients.at(0))) {
raise << maybe(get(Recipe, r).name) << "'assert' requires a boolean for its first ingredient, but got '" << inst.ingredients.at(0).original_string << "'\n" << end();
break;
}
if (!is_literal_text(inst.ingredients.at(1)) && !is_mu_text(inst.ingredients.at(1))) {
raise << maybe(get(Recipe, r).name) << "'assert' requires a text as its second ingredient, but got '" << inst.ingredients.at(1).original_string << "'\n" << end();
break;
}
break;
}
:(before "End Primitive Recipe Implementations")
case ASSERT: {
if (!ingredients.at(0).at(0)) {
if (is_literal_text(current_instruction().ingredients.at(1)))
raise << current_instruction().ingredients.at(1).name << '\n' << end();
else
raise << read_mu_text(ingredients.at(1).at(0)) << '\n' << end();
if (!Hide_errors) exit(1);
}
break;
}
//: 'cheating' by using the host system
:(before "End Primitive Recipe Declarations")
_READ,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$read", _READ);
:(before "End Primitive Recipe Checks")
case _READ: {
break;
}
:(before "End Primitive Recipe Implementations")
case _READ: {
skip_whitespace(cin);
string result;
if (has_data(cin))
cin >> result;
products.resize(1);
products.at(0).push_back(new_mu_text(result));
break;
}
:(code)
void skip_whitespace(istream& in) {
while (true) {
if (!has_data(in)) break;
if (isspace(in.peek())) in.get();
else break;
}
}
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