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// Copyright (C) 2021-2022 Soni L.
// SPDX-License-Identifier: MIT OR Apache-2.0
//! Datafu Patterns.
use std::borrow::Borrow;
use std::collections::BTreeMap;
use serde::de::Deserialize;
use serde::de::DeserializeSeed as _;
use serde::de::Deserializer;
use serde::ser::Serialize;
use crate::Predicate;
use crate::errors::PatternError;
use crate::graph::Graph;
use crate::parser::parse;
use crate::vm;
use crate::vm::PatternConstants;
use crate::vm::MAX_CALLS;
/// A compiled Datafu pattern.
///
/// # Examples
///
/// ```
/// use datafu::Pattern;
///
/// let pattern = Pattern::<()>::compile::<&str, &str>(
/// "->['value']'hello'",
/// None, None
/// ).expect("failed to compile pattern");
/// ```
pub struct Pattern<O: Serialize> {
consts: PatternConstants<O>,
}
impl<O: Serialize> Pattern<O> {
/// Matches the pattern against an input.
pub fn deserialize<'de, Der>(
&self,
der: Der,
) -> Result<Graph<'_, 'de>, Der::Error>
where
Der: Deserializer<'de>,
{
let mut err = Default::default();
let mut frames = Default::default();
//let mut output = Default::default();
let interp = vm::Interpreter::new(
&self.consts,
&mut err,
&mut frames,
//&mut output,
);
let (mut packs, obj) = vm::Packer::new(
interp,
MAX_CALLS,
).deserialize(der)?;
// this should always be None
debug_assert!(obj.is_none());
debug_assert!(packs.len() <= 1);
let pack = packs.pop();
Ok(Graph(pack))
}
}
pub struct PatternBuilder<'s, PKey=&'static str, OKey=&'static str, O=()> {
input: &'s str,
preds: Option<BTreeMap<PKey, Box<Predicate>>>,
objs: Option<BTreeMap<OKey, O>>,
}
impl<'s> PatternBuilder<'s> {
/// Creates a PatternBuilder for a given pattern.
///
/// # Examples
///
/// ```
/// use datafu::Pattern;
/// use serde::Deserialize;
/// use charx;
///
/// let preds = vec![
/// ("dict", datafu::pred(|v| { todo!() })),
/// ("str", datafu::pred(|v| { String::deserialize(v).is_ok() })),
/// ("commit", datafu::pred(|v| {
/// if let Ok(v) = String::deserialize(v) {
/// v.len() == 40 && v.trim_start_matches(
/// charx::is_ascii_hexdigit
/// ).is_empty()
/// } else {
/// false
/// }
/// })),
/// ("uri", datafu::pred(|v| { todo!() })),
/// ("bool", datafu::pred(|v| { todo!() })),
/// ].into_iter().collect();
/// let pattern = Pattern::<()>::compile::<&str, &str>("
/// ->'projects':$dict
/// ->commit[:?$str:?$commit]:?$dict
/// ->url[:?$str:?$uri]:?$dict
/// ->branch:?$dict
/// (->active'active'?:?$bool)
/// (->federate'federate'?:?$bool)?",
/// Some(preds), None
/// ).expect("failed to compile pattern");
/// ```
pub fn for_pattern(pattern: &'s str) -> Self {
Self {
input: pattern,
preds: None,
objs: None,
}
}
}
impl<'s, PKey, OKey, O> PatternBuilder<'s, PKey, OKey, O>
where
PKey: Borrow<str> + Ord,
OKey: Borrow<str> + Ord,
O: Serialize,
{
/// Compiles the pattern.
pub fn compile(self) -> Result<Pattern<O>, PatternError<'s>> {
Ok(Pattern {
consts: parse(self.input, self.preds, self.objs)?
})
}
}
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