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// Copyright (c) 2025-2026 Zensical and contributors
// SPDX-License-Identifier: MIT
// All contributions are certified under the DCO
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
// ----------------------------------------------------------------------------
//! Filter.
use Slab;
use cratefilter;
use Binding;
pub use Builder;
pub use Candidates;
use Condition;
pub use ;
use Layout;
// ----------------------------------------------------------------------------
// Structs
// ----------------------------------------------------------------------------
/// Filter.
///
/// Filters efficiently match ordered identifier sequences against a set of
/// compiled sequence conditions. Each [`Filter`] manages an inner expression
/// filter that identifies matching constrained expressions first, and a
/// positional constraint set that validates whether those candidate matches
/// satisfy a compiled sequence condition. Thus, the inner expression filter
/// can be thought of as the first stage, eliminating non-matching constrained
/// expressions, while the positional constraint set is the second stage, which
/// checks whether the remaining candidate matches are actually satisfiable.
///
/// Each [`Filter`] manages three cooperating compiled structures:
///
/// - [`Filter::filter`]: Contains an inner expression filter that matches the
/// constrained sequence slots against individual identifiers.
///
/// - [`Filter::bindings`]: Contains one item per constrained slot in the inner
/// expression filter, which maps candidate indices back to conditions.
///
/// - [`Filter::layout`]: Contains a condition layout that records where each
/// condition's slots live used to validate ordering and gap constraints.
///
/// # Examples
///
/// ```
/// # use std::error::Error;
/// # fn main() -> Result<(), Box<dyn Error>> {
/// use zrx_id::sequence::Filter;
/// use zrx_id::{selector, Id, Sequence};
///
/// // Create filter builder and insert sequence
/// let mut builder = Filter::builder();
/// builder.insert(Sequence::suffix(
/// selector!(location = "**/*.md")?,
/// ));
///
/// // Create filter from builder
/// let filter = builder.build()?;
///
/// // Create identifiers and obtain candidate sequences
/// let id: Id = "zri:file:::docs:index.md:".parse()?;
/// for index in filter.candidates([&id])? {
/// println!("{index:?}");
/// }
/// # Ok(())
/// # }
/// ```
// ----------------------------------------------------------------------------
// Implementations
// ----------------------------------------------------------------------------