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io.rs
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io.rs
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use {
crate::{get_external_instance, runtime_error, ExternalValue, RuntimeResult, Value, ValueMap},
std::{
fmt, fs,
io::{Read, Seek, SeekFrom, Write},
path::{Path, PathBuf},
},
};
pub fn make_file_map() -> ValueMap {
use Value::{Number, Str};
fn file_fn(
fn_name: &str,
args: &[Value],
mut file_op: impl FnMut(&mut File) -> RuntimeResult,
) -> RuntimeResult {
get_external_instance!(args, "File", fn_name, File, file_ref, { file_op(file_ref) })
}
let mut file_map = ValueMap::new();
file_map.add_instance_fn("path", |vm, args| {
file_fn("path", vm.get_args(args), |file_handle| {
Ok(Str(file_handle.path.to_string_lossy().as_ref().into()))
})
});
file_map.add_instance_fn("write", |vm, args| {
file_fn("write", vm.get_args(args), |file_handle| {
match vm.get_args(args) {
[_, value] => {
let data = format!("{}", value);
match file_handle.file.write(data.as_bytes()) {
Ok(_) => Ok(Value::Empty),
Err(e) => runtime_error!("File.write: Error while writing to file: {}", e),
}
}
_ => runtime_error!("File.write: Expected single value to write as argument"),
}
})
});
file_map.add_instance_fn("write_line", |vm, args| {
file_fn("write_line", vm.get_args(args), |file_handle| {
let line = match vm.get_args(args) {
[_] => "\n".to_string(),
[_, value] => format!("{}\n", value),
_ => {
return runtime_error!("File.write_line: Expected single value as argument");
}
};
match file_handle.file.write(line.as_bytes()) {
Ok(_) => Ok(Value::Empty),
Err(e) => runtime_error!("File.write_line: Error while writing to file: {}", e),
}
})
});
file_map.add_instance_fn("read_to_string", |vm, args| {
file_fn(
"read_to_string",
vm.get_args(args),
|file_handle| match file_handle.file.seek(SeekFrom::Start(0)) {
Ok(_) => {
let mut buffer = String::new();
match file_handle.file.read_to_string(&mut buffer) {
Ok(_) => Ok(Str(buffer.into())),
Err(e) => {
runtime_error!("File.read_to_string: Error while reading data: {}", e,)
}
}
}
Err(e) => {
runtime_error!("File.read_to_string: Error while seeking in file: {}", e)
}
},
)
});
file_map.add_instance_fn("seek", |vm, args| {
file_fn("seek", vm.get_args(args), |file_handle| {
match vm.get_args(args) {
[_, Number(n)] => {
if *n < 0.0 {
return runtime_error!("File.seek: Negative seek positions not allowed");
}
match file_handle.file.seek(SeekFrom::Start(n.into())) {
Ok(_) => Ok(Value::Empty),
Err(e) => runtime_error!("File.seek: Error while seeking in file: {}", e),
}
}
[_, unexpected] => runtime_error!(
"File.seek: Expected Number for seek position, found '{}'",
unexpected.type_as_string(),
),
_ => runtime_error!("File.seek: Expected seek position as second argument"),
}
})
});
file_map
}
pub fn make_module() -> ValueMap {
use Value::{Bool, Map, Str};
let mut result = ValueMap::new();
result.add_fn("exists", |vm, args| match vm.get_args(args) {
[Str(path)] => Ok(Bool(Path::new(path.as_str()).exists())),
_ => runtime_error!("io.exists: Expected path string as argument"),
});
result.add_fn("read_to_string", |vm, args| match vm.get_args(args) {
[Str(path)] => match fs::read_to_string(Path::new(path.as_str())) {
Ok(result) => Ok(Str(result.into())),
Err(e) => runtime_error!("io.read_to_string: Unable to read file '{}': {}", path, e),
},
_ => runtime_error!("io.read_to_string: Expected path string as argument"),
});
result.add_fn("open", {
move |vm, args| match vm.get_args(args) {
[Str(path)] => {
let path = Path::new(path.as_str());
match fs::File::open(&path) {
Ok(file) => {
let file_map = make_file_map();
file_map.contents_mut().data.insert(
Value::ExternalDataId.into(),
Value::make_external_value(File {
file,
path: path.to_path_buf(),
temporary: false,
}),
);
Ok(Map(file_map))
}
Err(e) => {
return runtime_error!("io.open: Error while opening path: {}", e);
}
}
}
[unexpected] => runtime_error!(
"io.open: Expected a String as argument, found '{}'",
unexpected.type_as_string(),
),
_ => runtime_error!("io.open: Expected a String as argument"),
}
});
result.add_fn("create", {
move |vm, args| match vm.get_args(args) {
[Str(path)] => {
let path = Path::new(path.as_str());
match fs::File::create(&path) {
Ok(file) => {
let mut file_map = make_file_map();
file_map.insert(
Value::ExternalDataId.into(),
Value::make_external_value(File {
file,
path: path.to_path_buf(),
temporary: false,
}),
);
Ok(Map(file_map))
}
Err(e) => {
return runtime_error!("io.create: Error while creating file: {}", e);
}
}
}
[unexpected] => runtime_error!(
"io.create: Expected a String as argument, found '{}'",
unexpected.type_as_string(),
),
_ => runtime_error!("io.create: Expected a String as argument"),
}
});
result.add_fn("temp_dir", {
|_, _| Ok(Str(std::env::temp_dir().to_string_lossy().as_ref().into()))
});
result.add_fn("remove_file", {
|vm, args| match vm.get_args(args) {
[Str(path)] => {
let path = Path::new(path.as_str());
match fs::remove_file(&path) {
Ok(_) => Ok(Value::Empty),
Err(e) => runtime_error!(
"io.remove_file: Error while removing file '{}': {}",
path.to_string_lossy(),
e,
),
}
}
[unexpected] => runtime_error!(
"io.remove_file: Expected a String as argument, found '{}'",
unexpected.type_as_string(),
),
_ => runtime_error!("io.remove_file: Expected a String as argument"),
}
});
result
}
#[derive(Debug)]
pub struct File {
pub file: fs::File,
pub path: PathBuf,
pub temporary: bool,
}
impl Drop for File {
fn drop(&mut self) {
if self.temporary {
let _ = fs::remove_file(&self.path).is_ok();
}
}
}
impl ExternalValue for File {
fn value_type(&self) -> String {
"File".to_string()
}
}
impl fmt::Display for File {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "File({})", self.path.to_string_lossy())
}
}