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|
module os_js
pub struct File {
pub:
fd int
pub mut:
is_opened bool
}
#const $buffer = require('buffer');
// todo(playX): __as_cast is broken here
/*
pub struct ErrFileNotOpened {
msg string = 'os: file not opened'
code int
}
pub struct ErrSizeOfTypeIs0 {
msg string = 'os: size of type is 0'
code int
}
fn error_file_not_opened() IError {
return IError(&ErrFileNotOpened{})
}
fn error_size_of_type_0() IError {
return IError(&ErrSizeOfTypeIs0{})
}
*/
pub fn open_file(path string, mode string, options ...int) ?File {
mut res := File{}
$if js_node {
#if (!options) { options = new array([]); }
#let permissions = 0o666
#if (options.arr.length > 0) { permissions = options.arr[0]; }
#try {
#res.fd = new int($fs.openSync(''+path,''+mode,permissions))
#} catch (e) {
#return builtin.error('' + e);
#}
res.is_opened = true
} $else {
error('cannot open file on non NodeJS runtime')
}
return res
}
// open tries to open a file for reading and returns back a read-only `File` object.
pub fn open(path string) ?File {
f := open_file(path, 'r') ?
return f
}
pub fn create(path string) ?File {
f := open_file(path, 'w') ?
return f
}
pub fn stdin() File {
return File{
fd: 0
is_opened: true
}
}
pub fn stdout() File {
return File{
fd: 1
is_opened: true
}
}
pub fn stderr() File {
return File{
fd: 2
is_opened: true
}
}
pub fn (f &File) read(mut buf []byte) ?int {
if buf.len == 0 {
return 0
}
mut nbytes := 0
#try {
#let buffer = $fs.readFileSync(f.fd.valueOf());
#
#for (const val of buffer.values()) { buf.arr[nbytes++] = val; }
#}
#catch (e) { return builtin.error('' + e); }
return nbytes
}
pub fn (mut f File) write(buf []byte) ?int {
if !f.is_opened {
return error('file is not opened')
}
mut nbytes := 0
#const b = $buffer.Buffer.from(buf.arr.map((x) => x.valueOf()))
#try { $fs.writeSync(f.fd.valueOf(),b,0,buf.len.valueOf(),0); } catch (e) { return builtin.error('' + e); }
return nbytes
}
// writeln writes the string `s` into the file, and appends a \n character.
// It returns how many bytes were written, including the \n character.
pub fn (mut f File) writeln(s string) ?int {
mut nbytes := f.write(s.bytes()) ?
nbytes += f.write('\n'.bytes()) ?
return nbytes
}
pub fn (mut f File) write_to(pos u64, buf []byte) ?int {
if !f.is_opened {
return error('file is not opened')
}
mut nbytes := 0
#const b = $buffer.Buffer.from(buf.arr.map((x) => x.valueOf()))
#try { $fs.writeSync(f.fd.valueOf(),b,0,buf.len.valueOf(),pos.valueOf()); } catch (e) { return builtin.error('' + e); }
return nbytes
}
// write_string writes the string `s` into the file
// It returns how many bytes were actually written.
pub fn (mut f File) write_string(s string) ?int {
nbytes := f.write(s.bytes()) ?
return nbytes
}
|
