226 lines
9.3 KiB
C++
226 lines
9.3 KiB
C++
//: Interacting with the file system.
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//: '$open-file-for-reading' returns a FILE* as a number (ugh)
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//: '$read-from-file' accepts a number, interprets it as a FILE* (double ugh) and reads a character from it
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//: Similarly for writing files.
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//: These interfaces are ugly and tied to the current (Linux) host Mu happens
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//: to be implemented atop. Later layers will wrap them with better, more
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//: testable interfaces.
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//:
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//: Clearly we don't care about performance or any of that so far.
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//: todo: reading/writing binary files
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:(before "End Primitive Recipe Declarations")
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_OPEN_FILE_FOR_READING,
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:(before "End Primitive Recipe Numbers")
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put(Recipe_ordinal, "$open-file-for-reading", _OPEN_FILE_FOR_READING);
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:(before "End Primitive Recipe Checks")
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case _OPEN_FILE_FOR_READING: {
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if (SIZE(inst.ingredients) != 1) {
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raise << maybe(get(Recipe, r).name) << "'$open-file-for-reading' requires exactly one ingredient, but got '" << to_original_string(inst) << "'\n" << end();
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break;
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}
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if (!is_mu_text(inst.ingredients.at(0))) {
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raise << maybe(get(Recipe, r).name) << "first ingredient of '$open-file-for-reading' should be a string, but got '" << to_string(inst.ingredients.at(0)) << "'\n" << end();
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break;
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}
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if (SIZE(inst.products) != 1) {
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raise << maybe(get(Recipe, r).name) << "'$open-file-for-reading' requires exactly one product, but got '" << to_original_string(inst) << "'\n" << end();
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break;
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}
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if (!is_mu_number(inst.products.at(0))) {
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raise << maybe(get(Recipe, r).name) << "first product of '$open-file-for-reading' should be a number (file handle), but got '" << to_string(inst.products.at(0)) << "'\n" << end();
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break;
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}
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break;
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}
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:(before "End Primitive Recipe Implementations")
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case _OPEN_FILE_FOR_READING: {
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string filename = read_mu_text(ingredients.at(0).at(/*skip alloc id*/1));
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assert(sizeof(long long int) >= sizeof(FILE*));
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FILE* f = fopen(filename.c_str(), "r");
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long long int result = reinterpret_cast<long long int>(f);
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products.resize(1);
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products.at(0).push_back(static_cast<double>(result));
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break;
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}
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:(before "End Primitive Recipe Declarations")
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_OPEN_FILE_FOR_WRITING,
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:(before "End Primitive Recipe Numbers")
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put(Recipe_ordinal, "$open-file-for-writing", _OPEN_FILE_FOR_WRITING);
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:(before "End Primitive Recipe Checks")
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case _OPEN_FILE_FOR_WRITING: {
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if (SIZE(inst.ingredients) != 1) {
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raise << maybe(get(Recipe, r).name) << "'$open-file-for-writing' requires exactly one ingredient, but got '" << to_original_string(inst) << "'\n" << end();
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break;
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}
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if (!is_mu_text(inst.ingredients.at(0))) {
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raise << maybe(get(Recipe, r).name) << "first ingredient of '$open-file-for-writing' should be a string, but got '" << to_string(inst.ingredients.at(0)) << "'\n" << end();
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break;
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}
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if (SIZE(inst.products) != 1) {
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raise << maybe(get(Recipe, r).name) << "'$open-file-for-writing' requires exactly one product, but got '" << to_original_string(inst) << "'\n" << end();
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break;
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}
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if (!is_mu_number(inst.products.at(0))) {
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raise << maybe(get(Recipe, r).name) << "first product of '$open-file-for-writing' should be a number (file handle), but got '" << to_string(inst.products.at(0)) << "'\n" << end();
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break;
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}
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break;
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}
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:(before "End Primitive Recipe Implementations")
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case _OPEN_FILE_FOR_WRITING: {
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string filename = read_mu_text(ingredients.at(0).at(/*skip alloc id*/1));
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assert(sizeof(long long int) >= sizeof(FILE*));
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long long int result = reinterpret_cast<long long int>(fopen(filename.c_str(), "w"));
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products.resize(1);
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products.at(0).push_back(static_cast<double>(result));
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break;
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}
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:(before "End Primitive Recipe Declarations")
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_READ_FROM_FILE,
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:(before "End Primitive Recipe Numbers")
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put(Recipe_ordinal, "$read-from-file", _READ_FROM_FILE);
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:(before "End Primitive Recipe Checks")
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case _READ_FROM_FILE: {
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if (SIZE(inst.ingredients) != 1) {
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raise << maybe(get(Recipe, r).name) << "'$read-from-file' requires exactly one ingredient, but got '" << to_original_string(inst) << "'\n" << end();
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break;
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}
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if (!is_mu_number(inst.ingredients.at(0))) {
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raise << maybe(get(Recipe, r).name) << "first ingredient of '$read-from-file' should be a number, but got '" << to_string(inst.ingredients.at(0)) << "'\n" << end();
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break;
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}
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if (SIZE(inst.products) != 2) {
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raise << maybe(get(Recipe, r).name) << "'$read-from-file' requires exactly two products, but got '" << to_original_string(inst) << "'\n" << end();
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break;
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}
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if (!is_mu_character(inst.products.at(0))) {
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raise << maybe(get(Recipe, r).name) << "first product of '$read-from-file' should be a character, but got '" << to_string(inst.products.at(0)) << "'\n" << end();
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break;
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}
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if (!is_mu_boolean(inst.products.at(1))) {
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raise << maybe(get(Recipe, r).name) << "second product of '$read-from-file' should be a boolean, but got '" << to_string(inst.products.at(1)) << "'\n" << end();
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break;
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}
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break;
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}
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:(before "End Primitive Recipe Implementations")
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case _READ_FROM_FILE: {
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long long int x = static_cast<long long int>(ingredients.at(0).at(0));
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FILE* f = reinterpret_cast<FILE*>(x);
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if (f == NULL) {
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raise << maybe(current_recipe_name()) << "can't read from null file in '" << to_string(current_instruction()) << "'\n" << end();
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break;
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}
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products.resize(2);
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if (feof(f)) {
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products.at(0).push_back(0);
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products.at(1).push_back(1); // eof
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break;
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}
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if (ferror(f)) {
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raise << maybe(current_recipe_name()) << "file in invalid state in '" << to_string(current_instruction()) << "'\n" << end();
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break;
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}
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char c = getc(f); // todo: unicode
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if (c == EOF) {
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products.at(0).push_back(0);
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products.at(1).push_back(1); // eof
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break;
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}
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if (ferror(f)) {
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raise << maybe(current_recipe_name()) << "couldn't read from file in '" << to_string(current_instruction()) << "'\n" << end();
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raise << " errno: " << errno << '\n' << end();
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break;
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}
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products.at(0).push_back(c);
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products.at(1).push_back(0); // not eof
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break;
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}
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:(before "End Includes")
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#include <errno.h>
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:(before "End Primitive Recipe Declarations")
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_WRITE_TO_FILE,
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:(before "End Primitive Recipe Numbers")
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put(Recipe_ordinal, "$write-to-file", _WRITE_TO_FILE);
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:(before "End Primitive Recipe Checks")
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case _WRITE_TO_FILE: {
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if (SIZE(inst.ingredients) != 2) {
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raise << maybe(get(Recipe, r).name) << "'$write-to-file' requires exactly two ingredients, but got '" << to_original_string(inst) << "'\n" << end();
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break;
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}
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if (!is_mu_number(inst.ingredients.at(0))) {
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raise << maybe(get(Recipe, r).name) << "first ingredient of '$write-to-file' should be a number, but got '" << to_string(inst.ingredients.at(0)) << "'\n" << end();
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break;
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}
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if (!is_mu_character(inst.ingredients.at(1))) {
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raise << maybe(get(Recipe, r).name) << "second ingredient of '$write-to-file' should be a character, but got '" << to_string(inst.ingredients.at(0)) << "'\n" << end();
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break;
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}
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if (!inst.products.empty()) {
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raise << maybe(get(Recipe, r).name) << "'$write-to-file' writes to no products, but got '" << to_original_string(inst) << "'\n" << end();
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break;
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}
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break;
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}
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:(before "End Primitive Recipe Implementations")
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case _WRITE_TO_FILE: {
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long long int x = static_cast<long long int>(ingredients.at(0).at(0));
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FILE* f = reinterpret_cast<FILE*>(x);
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if (f == NULL) {
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raise << maybe(current_recipe_name()) << "can't write to null file in '" << to_string(current_instruction()) << "'\n" << end();
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break;
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}
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if (feof(f)) break;
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if (ferror(f)) {
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raise << maybe(current_recipe_name()) << "file in invalid state in '" << to_string(current_instruction()) << "'\n" << end();
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break;
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}
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long long int y = static_cast<long long int>(ingredients.at(1).at(0));
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char c = static_cast<char>(y);
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putc(c, f); // todo: unicode
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if (ferror(f)) {
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raise << maybe(current_recipe_name()) << "couldn't write to file in '" << to_string(current_instruction()) << "'\n" << end();
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raise << " errno: " << errno << '\n' << end();
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break;
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}
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break;
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}
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:(before "End Primitive Recipe Declarations")
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_CLOSE_FILE,
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:(before "End Primitive Recipe Numbers")
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put(Recipe_ordinal, "$close-file", _CLOSE_FILE);
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:(before "End Primitive Recipe Checks")
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case _CLOSE_FILE: {
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if (SIZE(inst.ingredients) != 1) {
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raise << maybe(get(Recipe, r).name) << "'$close-file' requires exactly one ingredient, but got '" << to_original_string(inst) << "'\n" << end();
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break;
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}
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if (!is_mu_number(inst.ingredients.at(0))) {
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raise << maybe(get(Recipe, r).name) << "first ingredient of '$close-file' should be a number, but got '" << to_string(inst.ingredients.at(0)) << "'\n" << end();
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break;
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}
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if (SIZE(inst.products) != 1) {
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raise << maybe(get(Recipe, r).name) << "'$close-file' requires exactly one product, but got '" << to_original_string(inst) << "'\n" << end();
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break;
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}
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if (inst.products.at(0).name != inst.ingredients.at(0).name) {
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raise << maybe(get(Recipe, r).name) << "'$close-file' requires its product to be the same as its ingredient, but got '" << to_original_string(inst) << "'\n" << end();
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break;
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}
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break;
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}
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:(before "End Primitive Recipe Implementations")
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case _CLOSE_FILE: {
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long long int x = static_cast<long long int>(ingredients.at(0).at(0));
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FILE* f = reinterpret_cast<FILE*>(x);
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fclose(f);
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products.resize(1);
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products.at(0).push_back(0); // todo: ensure that caller always resets the ingredient
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break;
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}
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