stdlib/deno/file.rb
# backtick_javascript: true
`/* global Deno */`
require 'corelib/file'
%x{
var warnings = {}, errno_codes = #{Errno.constants};
function handle_unsupported_feature(message) {
switch (Opal.config.unsupported_features_severity) {
case 'error':
#{Kernel.raise NotImplementedError, `message`}
break;
case 'warning':
warn(message)
break;
default: // ignore
// noop
}
}
function warn(string) {
if (warnings[string]) {
return;
}
warnings[string] = true;
#{warn(`string`)};
}
function is_utf8(bytes) {
var i = 0;
while (i < bytes.length) {
if ((// ASCII
bytes[i] === 0x09 ||
bytes[i] === 0x0A ||
bytes[i] === 0x0D ||
(0x20 <= bytes[i] && bytes[i] <= 0x7E)
)
) {
i += 1;
continue;
}
if ((// non-overlong 2-byte
(0xC2 <= bytes[i] && bytes[i] <= 0xDF) &&
(0x80 <= bytes[i + 1] && bytes[i + 1] <= 0xBF)
)
) {
i += 2;
continue;
}
if ((// excluding overlongs
bytes[i] === 0xE0 &&
(0xA0 <= bytes[i + 1] && bytes[i + 1] <= 0xBF) &&
(0x80 <= bytes[i + 2] && bytes[i + 2] <= 0xBF)
) ||
(// straight 3-byte
((0xE1 <= bytes[i] && bytes[i] <= 0xEC) ||
bytes[i] === 0xEE ||
bytes[i] === 0xEF) &&
(0x80 <= bytes[i + 1] && bytes[i + 1] <= 0xBF) &&
(0x80 <= bytes[i + 2] && bytes[i + 2] <= 0xBF)
) ||
(// excluding surrogates
bytes[i] === 0xED &&
(0x80 <= bytes[i + 1] && bytes[i + 1] <= 0x9F) &&
(0x80 <= bytes[i + 2] && bytes[i + 2] <= 0xBF)
)
) {
i += 3;
continue;
}
if ((// planes 1-3
bytes[i] === 0xF0 &&
(0x90 <= bytes[i + 1] && bytes[i + 1] <= 0xBF) &&
(0x80 <= bytes[i + 2] && bytes[i + 2] <= 0xBF) &&
(0x80 <= bytes[i + 3] && bytes[i + 3] <= 0xBF)
) ||
(// planes 4-15
(0xF1 <= bytes[i] && bytes[i] <= 0xF3) &&
(0x80 <= bytes[i + 1] && bytes[i + 1] <= 0xBF) &&
(0x80 <= bytes[i + 2] && bytes[i + 2] <= 0xBF) &&
(0x80 <= bytes[i + 3] && bytes[i + 3] <= 0xBF)
) ||
(// plane 16
bytes[i] === 0xF4 &&
(0x80 <= bytes[i + 1] && bytes[i + 1] <= 0x8F) &&
(0x80 <= bytes[i + 2] && bytes[i + 2] <= 0xBF) &&
(0x80 <= bytes[i + 3] && bytes[i + 3] <= 0xBF)
)
) {
i += 4;
continue;
}
return false;
}
return true;
}
function executeIOAction(action) {
try {
return action();
} catch (error) {
if (errno_codes.indexOf(error.code) >= 0) {
var error_class = #{Errno.const_get(`error.code`)}
#{Kernel.raise `error_class`.new(`error.message`)}
}
#{Kernel.raise `error`}
}
}
}
class File < IO
`var __utf8TextDecoder__ = new TextDecoder('utf8')`
`var __textEncoder__ = new TextEncoder()`
def self.read(path)
`return executeIOAction(function(){return Deno.readFileSync(#{path}).toString()})`
end
def self.write(path, data)
`executeIOAction(function(){return Deno.writeFileSync(#{path}, __textEncoder__.encode(#{data}));})`
data.size
end
def self.delete(path)
`executeIOAction(function(){return Deno.removeSync(#{path})})`
end
class << self
alias unlink delete
end
def self.exist?(path)
path = path.path if path.respond_to? :path
`return executeIOAction(function(){return Deno.statSync(#{path})})`
end
def self.realpath(pathname, dir_string = nil, cache = nil, &block)
pathname = join(dir_string, pathname) if dir_string
if block_given?
`
Deno.realpath(#{pathname}, #{cache}, function(error, realpath){
if (error) Opal.IOError.$new(error.message)
else #{block.call(`realpath`)}
})
`
else
`return executeIOAction(function(){return Deno.realpathSync(#{pathname}, #{cache})})`
end
end
def self.join(*paths)
# by itself, `path.posix.join` normalizes leading // to /.
# restore the leading / on UNC paths (i.e., paths starting with //).
paths = paths.map(&:to_s)
prefix = paths.first&.start_with?('//') ? '/' : ''
path = prefix
paths.each do |pth|
path << if pth.end_with?('/') || pth.start_with?('/')
pth
else
'/' + pth
end
end
path
end
def self.directory?(path)
return false unless exist? path
result = `executeIOAction(function(){return !!Deno.lstatSync(path).isDirectory})`
unless result
realpath = realpath(path)
if realpath != path
result = `executeIOAction(function(){return !!Deno.lstatSync(realpath).isDirectory})`
end
end
result
end
def self.file?(path)
return false unless exist? path
result = `executeIOAction(function(){return !!Deno.lstatSync(path).isFile})`
unless result
realpath = realpath(path)
if realpath != path
result = `executeIOAction(function(){return !!Deno.lstatSync(realpath).isFile})`
end
end
result
end
def self.readable?(path)
return false unless exist? path
%x{
try {
Deno.openSync(path, {read: true}).close();
return true;
} catch (error) {
return false;
}
}
end
def self.size(path)
`return executeIOAction(function(){return Deno.lstatSync(path).size})`
end
def self.open(path, mode = 'r')
file = new(path, mode)
if block_given?
begin
yield(file)
ensure
file.close
end
else
file
end
end
def self.stat(path)
path = path.path if path.respond_to? :path
File::Stat.new(path)
end
def self.mtime(path)
`return executeIOAction(function(){return Deno.statSync(#{path}).mtime})`
end
def self.symlink?(path)
`return executeIOAction(function(){return Deno.lstatSync(#{path}).isSymLink})`
end
def self.absolute_path(path, basedir = nil)
raise 'File::absolute_path is currently unsupported in Deno!'
end
# Instance Methods
def initialize(path, flags = 'r')
@binary_flag = flags.include?('b')
# Node does not recognize this flag
flags = flags.delete('b')
# encoding flag is unsupported
encoding_option_rx = /:(.*)/
if encoding_option_rx.match?(flags)
`handle_unsupported_feature("Encoding option (:encoding) is unsupported by Node.js openSync method and will be removed.")`
flags = flags.sub(encoding_option_rx, '')
end
@path = path
fd = `executeIOAction(function(){return Deno.openSync(path, flags)})`
super(fd, flags)
end
attr_reader :path
def sysread(bytes)
if @eof
raise EOFError, 'end of file reached'
else
if @binary_flag
%x{
var buf = executeIOAction(function(){return Deno.readFileSync(#{@path})})
var content
if (is_utf8(buf)) {
content = buf.toString('utf8')
} else {
// coerce to utf8
content = __utf8TextDecoder__.decode(__textEncoder__.encode(buf.toString('binary')))
}
}
res = `content`
else
res = `executeIOAction(function(){return Deno.readFileSync(#{@path}).toString('utf8')})`
end
@eof = true
@lineno = res.size
res
end
end
def write(string)
`executeIOAction(function(){return #{@fd}.writeSync(__textEncoder__.encode(#{string}))})`
end
def flush
# not supported by deno
end
def close
`executeIOAction(function(){return #{@fd}.close()})`
super
end
def mtime
`return executeIOAction(function(){return Deno.statSync(#{@path}).mtime})`
end
end
class File::Stat
def initialize(path)
@path = path
end
def file?
`return executeIOAction(function(){return Deno.statSync(#{@path}).isFile})`
end
def directory?
`return executeIOAction(function(){return Deno.statSync(#{@path}).isDirectory})`
end
def mtime
`return executeIOAction(function(){return Deno.statSync(#{@path}).mtime})`
end
def readable?
%x{
return executeIOAction(function(){
Deno.openSync(path, {read: true}).close();
return true;
})
}
end
def writable?
%x{
return executeIOAction(function(){
Deno.openSync(path, {write: true}).close();
return true;
})
}
end
def executable?
# accessible only over unstable API
false
end
end