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use std::{convert::TryFrom, fmt, io, str::FromStr};
use crate::{
builder::{Builder, Config},
error::{access::AccessError, input::InputError},
parsers::InputType,
};
#[derive(Debug)]
pub struct Input {
kind: InputType,
}
impl Input {
pub fn builder() -> Builder {
Builder::default()
}
pub fn with_defaults(input: impl AsRef<str>) -> Result<Self, InputError> {
Config::default().parse(input.as_ref())
}
pub fn access(&self) -> Result<InputReader, AccessError> {
Read::try_from(&self.kind).map(InputReader::new)
}
pub(crate) fn from_input_type(i: InputType) -> Self {
Self { kind: i }
}
}
impl FromStr for Input {
type Err = InputError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
Self::with_defaults(s)
}
}
#[derive(Debug)]
pub struct InputReader {
input: Read,
}
impl InputReader {
fn new(input: Read) -> Self {
Self { input }
}
pub fn read_to_string(&mut self) -> Result<String, io::Error> {
let mut buf = String::new();
io::Read::read_to_string(&mut self.input, &mut buf)?;
Ok(buf)
}
}
impl io::Read for InputReader {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
io::Read::read(&mut self.input, buf)
}
}
enum Read {
File(std::fs::File),
Stdin(std::io::Stdin),
Text(io::Cursor<String>),
}
impl Read {
fn stdin() -> Self {
Self::Stdin(io::stdin())
}
fn file(f: std::fs::File) -> Self {
Self::File(f)
}
fn text(s: impl AsRef<str>) -> Self {
let s = s.as_ref().to_string();
Self::Text(io::Cursor::new(s))
}
}
impl TryFrom<&InputType> for Read {
type Error = AccessError;
fn try_from(kind: &InputType) -> Result<Self, Self::Error> {
match kind {
InputType::Stdin => Ok(Read::stdin()),
InputType::File(ref f) => std::fs::File::open(f.path.as_path())
.map(Read::file)
.map_err(|e| AccessError::file_with_context(e, f.path.as_path())),
InputType::UTF8(ref s) => Ok(Self::text(s)),
}
}
}
impl io::Read for Read {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
use Read::*;
match self {
File(ref mut file) => io::Read::read(file, buf),
Stdin(ref mut stdin) => io::Read::read(stdin, buf),
Text(ref mut cursor) => io::Read::read(cursor, buf),
}
}
}
impl fmt::Debug for Read {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
use Read::*;
let mut dbg = f.debug_struct("Read");
match self {
File(f) => dbg.field("file", &f),
Stdin(s) => dbg.field("stdin", &s),
Text(t) => dbg.field("cursor", &t),
};
dbg.finish()
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn input_from_default() {
let input = "@/some/file/path";
let res = Input::with_defaults(input);
assert!(res.is_ok())
}
#[test]
fn input_from_str() {
let input = "some text";
let res = Input::from_str(input);
assert!(res.is_ok())
}
#[test]
fn input_reader() {
let input = "some random text";
let i = Input::with_defaults(input).unwrap();
let output = i.access().unwrap().read_to_string().unwrap();
assert_eq!(input, output.as_str())
}
}