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//: Clean syntax to manipulate and check the file system in scenarios.
//: Instruction 'assume-resources' implicitly creates a variable called
//: 'resources' that is accessible to later instructions in the scenario.
:(scenarios run_mu_scenario)
:(scenario simple_filesystem)
scenario simple-filesystem [
local-scope
assume-resources [
# file 'a' containing two lines of data
[a] <- [
|a bc|
|de f|
]
# directory 'b' containing two files, 'c' and 'd'
[b/c] <- []
[b/d] <- [
|xyz|
]
]
data:&:@:resource <- get *resources, data:offset
file1:resource <- index *data, 0
file1-name:text <- get file1, name:offset
10:@:char/raw <- copy *file1-name
file1-contents:text <- get file1, contents:offset
100:@:char/raw <- copy *file1-contents
file2:resource <- index *data, 1
file2-name:text <- get file2, name:offset
30:@:char/raw <- copy *file2-name
file2-contents:text <- get file2, contents:offset
40:@:char/raw <- copy *file2-contents
file3:resource <- index *data, 2
file3-name:text <- get file3, name:offset
50:@:char/raw <- copy *file3-name
file3-contents:text <- get file3, contents:offset
60:@:char/raw <- copy *file3-contents
memory-should-contain [
10:array:character <- [a]
100:array:character <- [a bc
de f
]
30:array:character <- [b/c]
40:array:character <- []
50:array:character <- [b/d]
60:array:character <- [xyz
]
]
]
:(scenario escaping_file_contents)
scenario escaping-file-contents [
local-scope
assume-resources [
# file 'a' containing a '|'
# need to escape '\' once for each block
[a] <- [
|x\\\\|yz|
]
]
data:&:@:resource <- get *resources, data:offset
file1:resource <- index *data, 0
file1-name:text <- get file1, name:offset
10:@:char/raw <- copy *file1-name
file1-contents:text <- get file1, contents:offset
20:@:char/raw <- copy *file1-contents
memory-should-contain [
10:array:character <- [a]
20:array:character <- [x|yz
]
]
]
:(before "End Globals")
extern const int RESOURCES = Next_predefined_global_for_scenarios++;
//: give 'resources' a fixed location in scenarios
:(before "End Special Scenario Variable Names(r)")
Name[r]["resources"] = RESOURCES;
//: make 'resources' always a raw location in scenarios
:(before "End is_special_name Special-cases")
if (s == "resources") return true;
:(before "End Initialize Type Of Special Name In Scenario(r)")
if (r.name == "resources") r.type = new_type_tree("address:resources");
:(before "End initialize_transform_rewrite_literal_string_to_text()")
recipes_taking_literal_strings.insert("assume-resources");
//: screen-should-contain is a regular instruction
:(before "End Primitive Recipe Declarations")
ASSUME_RESOURCES,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "assume-resources", ASSUME_RESOURCES);
:(before "End Primitive Recipe Checks")
case ASSUME_RESOURCES: {
break;
}
:(before "End Primitive Recipe Implementations")
case ASSUME_RESOURCES: {
assert(scalar(ingredients.at(0)));
assume_resources(current_instruction().ingredients.at(0).name, current_recipe_name());
break;
}
:(code)
void assume_resources(const string& data, const string& caller) {
map<string, string> contents;
parse_resources(data, contents, caller);
construct_resources_object(contents);
}
void parse_resources(const string& data, map<string, string>& out, const string& caller) {
istringstream in(data);
in >> std::noskipws;
while (true) {
if (!has_data(in)) break;
skip_whitespace_and_comments(in);
if (!has_data(in)) break;
string filename = next_word(in);
if (filename.empty()) {
assert(!has_data(in));
raise << "incomplete 'resources' block at end of file (0)\n" << end();
return;
}
if (*filename.begin() != '[') {
raise << caller << ": assume-resources: filename '" << filename << "' must begin with a '['\n" << end();
break;
}
if (*filename.rbegin() != ']') {
raise << caller << ": assume-resources: filename '" << filename << "' must end with a ']'\n" << end();
break;
}
filename.erase(0, 1);
filename.erase(SIZE(filename)-1);
if (!has_data(in)) {
raise << caller << ": assume-resources: no data for filename '" << filename << "'\n" << end();
break;
}
string arrow = next_word(in);
if (arrow.empty()) {
assert(!has_data(in));
raise << "incomplete 'resources' block at end of file (1)\n" << end();
return;
}
if (arrow != "<-") {
raise << caller << ": assume-resources: expected '<-' after filename '" << filename << "' but got '" << arrow << "'\n" << end();
break;
}
if (!has_data(in)) {
raise << caller << ": assume-resources: no data for filename '" << filename << "' after '<-'\n" << end();
break;
}
string contents = next_word(in);
if (contents.empty()) {
assert(!has_data(in));
raise << "incomplete 'resources' block at end of file (2)\n" << end();
return;
}
if (*contents.begin() != '[') {
raise << caller << ": assume-resources: file contents '" << contents << "' for filename '" << filename << "' must begin with a '['\n" << end();
break;
}
if (*contents.rbegin() != ']') {
raise << caller << ": assume-resources: file contents '" << contents << "' for filename '" << filename << "' must end with a ']'\n" << end();
break;
}
contents.erase(0, 1);
contents.erase(SIZE(contents)-1);
put(out, filename, munge_resources_contents(contents, filename, caller));
}
}
string munge_resources_contents(const string& data, const string& filename, const string& caller) {
if (data.empty()) return "";
istringstream in(data);
in >> std::noskipws;
skip_whitespace_and_comments(in);
ostringstream out;
while (true) {
if (!has_data(in)) break;
skip_whitespace(in);
if (!has_data(in)) break;
if (in.peek() != '|') {
raise << caller << ": assume-resources: file contents for filename '" << filename << "' must be delimited in '|'s\n" << end();
break;
}
in.get(); // skip leading '|'
string line;
getline(in, line);
for (int i = 0; i < SIZE(line); ++i) {
if (line.at(i) == '|') break;
if (line.at(i) == '\\') {
++i; // skip
if (i == SIZE(line)) {
raise << caller << ": assume-resources: file contents can't end a line with '\\'\n" << end();
break;
}
}
out << line.at(i);
}
// todo: some way to represent a file without a final newline
out << '\n';
}
return out.str();
}
void construct_resources_object(const map<string, string>& contents) {
int resources_data_address = allocate(SIZE(contents)*2 + /*array length*/1);
int curr = resources_data_address + /*skip refcount and length*/2;
for (map<string, string>::const_iterator p = contents.begin(); p != contents.end(); ++p) {
put(Memory, curr, new_mu_text(p->first));
trace("mem") << "storing file name " << get(Memory, curr) << " in location " << curr << end();
put(Memory, get(Memory, curr), 1);
trace("mem") << "storing refcount 1 in location " << get(Memory, curr) << end();
++curr;
put(Memory, curr, new_mu_text(p->second));
trace("mem") << "storing file contents " << get(Memory, curr) << " in location " << curr << end();
put(Memory, get(Memory, curr), 1);
trace("mem") << "storing refcount 1 in location " << get(Memory, curr) << end();
++curr;
}
curr = resources_data_address+/*skip refcount*/1;
put(Memory, curr, SIZE(contents)); // size of array
trace("mem") << "storing resources size " << get(Memory, curr) << " in location " << curr << end();
put(Memory, resources_data_address, 1); // initialize refcount
trace("mem") << "storing refcount 1 in location " << resources_data_address << end();
// wrap the resources data in a 'resources' object
int resources_address = allocate(size_of_resources());
curr = resources_address+/*skip refcount*/1+/*offset of 'data' element*/1;
put(Memory, curr, resources_data_address);
trace("mem") << "storing resources data address " << resources_data_address << " in location " << curr << end();
put(Memory, resources_address, 1); // initialize refcount
trace("mem") << "storing refcount 1 in location " << resources_address << end();
// save in product
put(Memory, RESOURCES, resources_address);
trace("mem") << "storing resources address " << resources_address << " in location " << RESOURCES << end();
}
int size_of_resources() {
// memoize result if already computed
static int result = 0;
if (result) return result;
assert(get(Type_ordinal, "resources"));
type_tree* type = new type_tree("resources");
result = size_of(type)+/*refcount*/1;
delete type;
return result;
}
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