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mod action_parsers;
mod errors;
pub use errors::Error;
use crate::action::Action;
use crate::actions::getter::namespace::Namespace as GetterNamespace;
use crate::actions::setter::namespace::Namespace as SetterNamespace;
use crate::actions::{Getter, Setter};
use once_cell::sync::Lazy;
use regex::Regex;
use serde::{Deserialize, Serialize};
use std::borrow::Cow;
use std::collections::HashMap;
use std::sync::{Arc, Mutex};
pub static COMMA_SEP_RE: Lazy<Regex> =
Lazy::new(|| Regex::new(r#"[^,(]*(?:\([^)]*\))*[^,]*"#).unwrap());
pub static QUOTED_STR_RE: Lazy<Regex> = Lazy::new(|| Regex::new(r#"^"(.*?[^\\])"\s*,"#).unwrap());
static ACTION_RE: Lazy<Regex> = Lazy::new(|| {
let r = format!(r#"(?P<action>{})\((?P<value>.*)\)"#, ACTION_NAME_BASE_REGEX);
Regex::new(&r).unwrap()
});
static ACTION_PARSERS: Lazy<Mutex<HashMap<String, Arc<ActionParserFn>>>> = Lazy::new(|| {
let mut m: HashMap<String, Arc<ActionParserFn>> = HashMap::new();
m.insert("join".to_string(), Arc::new(action_parsers::parse_join));
m.insert("const".to_string(), Arc::new(action_parsers::parse_const));
Mutex::new(m)
});
static ACTION_NAME_RE: Lazy<Regex> = Lazy::new(|| {
let r = format!("^{}$", ACTION_NAME_BASE_REGEX);
Regex::new(&r).unwrap()
});
const ACTION_NAME_BASE_REGEX: &str = "[a-zA-Z0-9_]+";
const ACTION_NAME: &str = "action";
const ACTION_VALUE: &str = "value";
pub type ActionParserFn = dyn Fn(&str) -> Result<Box<dyn Action>, Error> + 'static + Send + Sync;
#[derive(Debug, Serialize, Deserialize, PartialEq)]
pub struct Parsable<'a> {
source: Cow<'a, str>,
destination: Cow<'a, str>,
}
impl<'a> Parsable<'a> {
pub fn new<S>(source: S, destination: S) -> Self
where
S: Into<Cow<'a, str>>,
{
Parsable {
source: source.into(),
destination: destination.into(),
}
}
}
pub struct Parser {}
impl Parser {
pub fn add_action_parser(name: &str, f: &'static ActionParserFn) -> Result<(), Error> {
if !ACTION_NAME_RE.is_match(name) {
return Err(Error::InvalidActionName(name.to_owned()));
}
ACTION_PARSERS
.lock()
.unwrap()
.insert(name.to_owned(), Arc::new(f));
Ok(())
}
pub fn parse(source: &str, destination: &str) -> Result<Box<dyn Action>, Error> {
let set = SetterNamespace::parse(destination)?;
let action = Parser::parse_action(source)?;
Ok(Box::new(Setter::new(set, action)))
}
pub fn parse_multi(parsables: &[Parsable]) -> Result<Vec<Box<dyn Action>>, Error> {
let mut vec = Vec::new();
for p in parsables.iter() {
vec.push(Parser::parse(&p.source, &p.destination)?);
}
Ok(vec)
}
pub fn parse_multi_from_str(s: &str) -> Result<Vec<Box<dyn Action>>, Error> {
let parsables: Vec<Parsable> = serde_json::from_str(s)?;
Parser::parse_multi(&parsables)
}
pub fn parse_action(source: &str) -> Result<Box<dyn Action>, Error> {
if source.starts_with(r#"[""#) {
let get = GetterNamespace::parse(source)?;
return Ok(Box::new(Getter::new(get)));
}
match ACTION_RE.captures(source) {
Some(caps) => match caps.name(ACTION_NAME) {
None => Err(Error::MissingActionName {}),
Some(key) => {
let key = key.as_str();
let parse_fn;
match ACTION_PARSERS.lock().unwrap().get(key) {
None => return Err(Error::InvalidActionName(key.to_owned())),
Some(f) => {
parse_fn = f.clone();
}
};
parse_fn(caps.name(ACTION_VALUE).unwrap().as_str())
}
},
None => {
let get = GetterNamespace::parse(source)?;
Ok(Box::new(Getter::new(get)))
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::actions::Constant;
#[test]
fn direct_getter() -> Result<(), Box<dyn std::error::Error>> {
let action = Parser::parse("key", "new")?;
let expected = Box::new(Setter::new(
SetterNamespace::parse("new")?,
Box::new(Getter::new(GetterNamespace::parse("key")?)),
));
assert_eq!(format!("{:?}", action), format!("{:?}", expected));
Ok(())
}
#[test]
fn constant() -> Result<(), Box<dyn std::error::Error>> {
let action = Parser::parse(r#"const("value")"#, "new")?;
let expected = Box::new(Setter::new(
SetterNamespace::parse("new")?,
Box::new(Constant::new("value".into())),
));
assert_eq!(format!("{:?}", action), format!("{:?}", expected));
Ok(())
}
#[test]
fn parser_serialize_deserialize() -> Result<(), Box<dyn std::error::Error>> {
let parsables = vec![
Parsable::new(r#"const("value")"#, "new"),
Parsable::new(r#"const("value2")"#, "new2"),
];
let serialized = serde_json::to_string(&parsables)?;
let expected = "[{\"source\":\"const(\\\"value\\\")\",\"destination\":\"new\"},{\"source\":\"const(\\\"value2\\\")\",\"destination\":\"new2\"}]";
assert_eq!(expected, serialized);
let deserialized: Vec<Parsable> = serde_json::from_str(&serialized)?;
assert_eq!(parsables, deserialized);
Ok(())
}
#[test]
fn parser_from_str() -> Result<(), Box<dyn std::error::Error>> {
let parsables = vec![
Parsable::new(r#"const("value")"#, "new"),
Parsable::new(r#"const("value2")"#, "new2"),
];
let expected = Parser::parse_multi(&parsables)?;
let deserialized = Parser::parse_multi_from_str("[{\"source\":\"const(\\\"value\\\")\",\"destination\":\"new\"},{\"source\":\"const(\\\"value2\\\")\",\"destination\":\"new2\"}]")?;
assert_eq!(format!("{:?}", expected), format!("{:?}", deserialized));
Ok(())
}
#[test]
fn join() -> Result<(), Box<dyn std::error::Error>> {
let action = Parser::parse(
r#"join(",_" , first_name, last_name, const("Dean Karn"))"#,
"full_name",
)?;
let expected = "Setter { namespace: [Object { id: \"full_name\" }], child: Join { sep: \",_\", values: [Getter { namespace: [Object { id: \"first_name\" }] }, Getter { namespace: [Object { id: \"last_name\" }] }, Constant { value: String(\"Dean Karn\") }] } }";
assert_eq!(format!("{:?}", action), expected.to_string());
Ok(())
}
}