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/*!
Parsing input data with support for multiple text and binary formats
*/
use std::path::Path;
macro_rules! decl_formats {
($(
$(#[$attr:meta])*
$type:ident $name:ident [ $($ext:literal),* ];
)*) => {
// Define modules
$(
$(#[$attr])*
mod $name;
)*
/// Supported input data formats
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
pub enum Format {
$(
$(#[$attr])*
$type,
)*
}
impl std::str::FromStr for Format {
type Err = &'static str;
fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
Ok(match s {
$(
$(#[$attr])*
stringify!($name) => Self::$type,
)*
_ => return Err("unknown"),
})
}
}
impl std::fmt::Display for Format {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
match self {
$(
$(#[$attr])*
Self::$type => stringify!($name).fmt(f),
)*
}
}
}
impl Format {
/// List of all variants
pub const LIST: &'static [&'static str] = &[
$(
$(#[$attr])*
stringify!($name),
)*
];
/// Determining data format from file name
pub fn from_path(path: &Path) -> Option<Self> {
let ext = path.extension()?;
$(
$(#[$attr])*
if $(ext == $ext ||)* false {
return Some(Self::$type);
}
)*
None
}
/// Unified data parsing
pub fn parse_data(&self, topic: &str, path: &Path, data: &[u8]) -> Option<json::Value> {
match self {
$(
$(#[$attr])*
Self::$type => {
$name::from_slice(data)
.map_err(|error| {
log::error!(
"Unable to parse {} {} from '{}' due to: {}",
stringify!($name),
topic,
path.display(),
error
);
})
.ok()
}
)*
}
}
}
};
}
decl_formats! {
Json json ["json"];
#[cfg(feature = "json5")]
Json5 json5 ["json5"];
#[cfg(feature = "yaml")]
Yaml yaml ["yaml", "yml"];
#[cfg(feature = "toml")]
Toml toml ["toml"];
#[cfg(feature = "ron")]
Ron ron ["ron"];
#[cfg(feature = "bson")]
Bson bson ["bson"];
#[cfg(feature = "cbor")]
Cbor cbor ["cbor"];
#[cfg(feature = "pickle")]
Pickle pickle ["pickle"];
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn format_from_path() {
use Format::*;
assert_eq!(
Format::from_path(Path::new("path/to/data.json")),
Some(Json)
);
#[cfg(feature = "yaml")]
assert_eq!(
Format::from_path(Path::new("path/to/data.yaml")),
Some(Yaml)
);
#[cfg(feature = "yaml")]
assert_eq!(Format::from_path(Path::new("path/to/data.yml")), Some(Yaml));
#[cfg(not(feature = "yaml"))]
assert_eq!(Format::from_path(Path::new("path/to/data.yml")), None);
#[cfg(feature = "toml")]
assert_eq!(
Format::from_path(Path::new("path/to/data.toml")),
Some(Toml)
);
#[cfg(not(feature = "toml"))]
assert_eq!(Format::from_path(Path::new("path/to/data.toml")), None);
assert_eq!(Format::from_path(Path::new("path/to/dir")), None);
}
#[cfg(feature = "json5")]
#[test]
fn parse_json5() {
let data: json::Value = json5::from_slice(b"{a:1, b:false, c:[1,true,'a',], }").unwrap();
println!("json5: {:?}", data);
assert_eq!(
data,
::json::json!(
{
"a": 1,
"b": false,
"c": [1, true, "a"]
}
)
);
}
#[cfg(feature = "yaml")]
#[test]
fn parse_yaml() {
let data: json::Value =
yaml::from_slice(b"a: 1\nb: false\nc:\n- 1\n- true\n- a\n").unwrap();
println!("yaml: {:?}", data);
assert_eq!(
data,
::json::json!(
{
"a": 1,
"b": false,
"c": [1, true, "a"]
}
)
);
}
#[cfg(feature = "toml")]
#[test]
fn parse_toml() {
let data: json::Value = toml::from_slice(b"a = 1\nb = false\nc = [1, true, 'a',]").unwrap();
println!("toml: {:?}", data);
assert_eq!(
data,
::json::json!(
{
"a": 1,
"b": false,
"c": [1, true, "a"]
}
)
);
}
#[cfg(feature = "toml")]
#[test]
fn parse_toml_nested() {
let data: json::Value =
toml::from_slice(b"[topic]\na = 1\nb = false\nc = [1, true, 'a',]").unwrap();
println!("toml: {:?}", data);
assert_eq!(
data,
::json::json!(
{
"topic": {
"a": 1,
"b": false,
"c": [1, true, "a"]
}
}
)
);
}
}