300 lines
9.3 KiB
Rust
300 lines
9.3 KiB
Rust
extern crate serde;
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extern crate serde_json;
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extern crate serde_yaml;
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use serde::{Deserialize, Serialize};
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extern crate log;
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use log::{error, info};
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// mod utils;
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pub mod utils;
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use utils::SettingsType;
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/// Current version of the ruleset. It will help determine if the ruleset is
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/// outdated or from a more recent version of the software than the one being in
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/// use.
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pub const RULESET_CURRENT_VERSION: i32 = 1;
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/// Encode a [`Settings`] struct to a filetype, returns a
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/// `std::result::Result<std::string::String, std::io::Error>`
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///
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/// # Arguments
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///
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/// * `funcrate` - `serde`-compatible crate to use, must implement `to_string`
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/// * `content` - content to encode, must be `Settings` struct
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///
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/// # Example
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///
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/// ```ignore
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/// # use lang_evolve_core::settings::*;
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/// # use lang_evolve_core::encode_settings;
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/// use std::io::{Error, ErrorKind};
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/// use std::path::Path;
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/// let filetype = utils::get_file_type(Path::new("./path/to/file.json"));
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/// let s = Settings::new();
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/// let content = match filetype {
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/// utils::SettingsType::Yaml => encode_settings!(serde_yaml, &s).unwrap(),
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/// utils::SettingsType::Json => encode_settings!(serde_json, &s).unwrap(),
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/// _ => panic!("Could not encode settings"),
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/// };
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/// ```
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///
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/// [`Settings`]: ./settings/struct.Settings.html
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#[macro_export(local_inner_macros)]
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macro_rules! encode_settings {
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($funcrate:ident, $content:expr) => {
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match $funcrate::to_string($content) {
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Err(e) => {
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log::error!("Could not serialize settings: {}", e.to_string());
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return Err(std::io::Error::new(
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std::io::ErrorKind::InvalidData,
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e,
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));
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}
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Ok(val) => val,
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}
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};
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}
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/// Decode a [`Settings`] struct from a `std::std::String`, returns a
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/// std::result::Result<lang_evolve_core::settings::Settings, std::io::Error>
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///
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/// # Arguments
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///
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/// * `funcrate` - `serde`-compatible crate to use, mus implement `from_string`
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/// * `content` - `&str` to decode into a [`Settings`]
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///
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/// # Example
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///
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/// ```ignore
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/// # use lang_evolve_core::decode_settings;
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/// let str = r#"{"version":"1","categories":[],"rules":[]}"#;
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/// let settings = decode_settings!(serde_json, str);
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/// ```
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///
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/// [`Settings`]: ./settings/struct.Settings.html
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#[macro_export(local_inner_macros)]
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macro_rules! decode_settings {
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($funcrate:ident, $content:expr) => {
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match $funcrate::from_str($content) {
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Err(e) => {
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log::error!("Could not import settings: {}", e.to_string());
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return Err(std::io::Error::new(
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std::io::ErrorKind::InvalidInput,
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e,
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));
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}
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Ok(val) => val,
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}
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};
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}
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#[derive(Debug, Deserialize, Serialize)]
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pub struct Settings {
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#[serde(default = "Settings::get_ruleset_version")]
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version: String,
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#[serde(default)]
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categories: Vec<(String, String)>,
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#[serde(default)]
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rules: Vec<(String, String)>,
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}
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/// Representation inside the crate of LangEvolve’s settings.
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impl Settings {
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/// Creates a new empty instance of `Settings`
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///
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/// # Example
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///
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/// ```
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/// let s = lang_evolve_core::settings::Settings::new();
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/// let content_yaml = r#"---
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/// version: "1"
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/// categories: []
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/// rules: []"#;
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/// let content_json = r#"{"version":"1","categories":[],"rules":[]}"#;
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/// assert_eq!(content_yaml, serde_yaml::to_string(&s).unwrap());
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/// assert_eq!(content_json, serde_json::to_string(&s).unwrap());
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/// ```
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pub fn new() -> Self {
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Self {
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version: Self::get_ruleset_version(),
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categories: Vec::new(),
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rules: Vec::new(),
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}
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}
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/// Import settings from an imput file. The currently allowed file formats
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/// are:
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/// - JSON - with the `.json` extension
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/// - Yaml - with the `.yaml` or `.yml` extension
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/// The format will be automatically detected based on the filename
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/// extension.
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///
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/// # Arguments
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///
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/// * `path` - File to open and load settings from
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///
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/// # Example
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///
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/// ```no_run
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/// use std::path::Path;
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/// use lang_evolve_core::settings::Settings;
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/// let path_json = Path::new("settings.json");
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/// let _s_json = Settings::import(&path_json).unwrap();
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///
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/// let path_yaml = Path::new("settings.yaml");
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/// let _s_yaml = Settings::import(&path_yaml).unwrap();
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///
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/// let path_yml = Path::new("settings.yml");
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/// let _s_yml = Settings::import(&path_yml).unwrap();
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/// ```
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pub fn import(path: &std::path::Path) -> std::io::Result<Self> {
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use utils::SettingsType::{Json, Yaml};
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let file_type = utils::get_file_type(&path);
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let content = utils::read_file(&path)?;
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let settings: Settings = match file_type {
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Yaml => decode_settings!(serde_yaml, &content),
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Json => decode_settings!(serde_json, &content),
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// Attempt to decode anyway
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_ => match Settings::from_str(&content.as_str()) {
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Ok(val) => val,
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Err(e) => {
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error!(
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"Could not decode input {}: {}",
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content,
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e.to_string()
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);
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return Err(std::io::Error::new(
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std::io::ErrorKind::InvalidData,
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e,
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));
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}
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},
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};
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info!("Successfuly imported {}", path.display());
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Ok(settings)
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}
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/// Export the current rules to a file. The allowed file formats are either
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/// a YAML file or a Json file, hence the allowed filename extension are:
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/// * "yml" or "yaml" for Yaml files
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/// * "json" for Json files
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/// The format is detected automatically depending on the extension of the
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/// filename.
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///
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/// # Arguments
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///
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/// * `path` - Path to write and export settings to
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///
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/// # Example
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///
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/// ```
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/// use std::path::Path;
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/// let s = lang_evolve_core::settings::Settings::new();
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///
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/// // Export to JSON
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/// let path_json = Path::new("./output.json");
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/// s.export(&path_json).unwrap();
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///
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/// // Export to Yaml, both ".yml" and ".yaml" work
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/// let path_yaml = Path::new("./output.yaml");
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/// s.export(&path_yaml).unwrap();
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/// let path_yml = Path::new("./output.yml");
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/// s.export(&path_yml).unwrap();
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/// ```
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pub fn export(&self, path: &std::path::Path) -> std::io::Result<()> {
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let filetype = utils::get_file_type(&path);
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let content = match filetype {
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SettingsType::Yaml => encode_settings!(serde_yaml, &self),
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SettingsType::Json => encode_settings!(serde_json, &self),
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_ => {
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error!("Unknown filetype {}", path.to_str().unwrap());
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return Err(std::io::Error::new(
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std::io::ErrorKind::InvalidData,
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"Unknown file type",
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));
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}
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};
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info!("Successfuly exported settings to {}", path.display());
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utils::write_file(&path, &content)
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}
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/// Get the current ruleset version of LangEvolve.
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fn get_ruleset_version() -> String {
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RULESET_CURRENT_VERSION.to_string()
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}
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}
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use std::str::FromStr;
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impl FromStr for Settings {
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type Err = serde_yaml::Error;
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/// Decode a litteral string into a `Settings` struct. Works only for
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/// supported file types described in `SettingsType`. It will try to decode
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/// the input `s` by any mean known by `SettingsType`.
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///
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/// # Arguments
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///
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/// * `s` - litteral string to decode into a `Settings` struct
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///
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/// # Example
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///
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/// ```
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/// # use std::str::FromStr;
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/// let s = r#"{"version":"1","categories":[],"rules":[]}"#;
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/// let settings = lang_evolve_core::settings::Settings::from_str(s).unwrap();
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/// ```
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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match serde_json::from_str::<Settings>(s) {
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Ok(val) => Ok(val),
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Err(_) => match serde_yaml::from_str::<Settings>(s) {
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Ok(val) => Ok(val),
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Err(e) => {
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error!("Could not decode input {}: {}", s, e.to_string());
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return Err(e);
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}
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},
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}
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}
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}
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use std::fmt;
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use std::fmt::Display;
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impl Display for Settings {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", serde_json::to_string(&self).unwrap())
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}
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}
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impl PartialEq for Settings {
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fn eq(&self, other: &Self) -> bool {
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self.version == other.version
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&& self.categories == other.categories
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&& self.rules == other.rules
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}
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}
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impl Eq for Settings {}
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#[test]
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fn write_settings() {
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let s = Settings::new();
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let path = std::path::Path::new("test.yaml");
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let settings = r#"---
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version: "1"
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categories: []
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rules: []"#;
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utils::write_file(&path, &serde_yaml::to_string(&s).unwrap()).unwrap();
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assert_eq!(settings, utils::read_file(&path).unwrap());
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}
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#[test]
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fn read_settings() {
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let s1 = Settings::new();
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let path = std::path::Path::new("test.yml");
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s1.export(&path).unwrap();
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let s2 = Settings::import(&path).unwrap();
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assert_eq!(s1, s2);
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}
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