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Diffstat (limited to 'crates/syntax/src/ast/syntax_factory.rs')
| -rw-r--r-- | crates/syntax/src/ast/syntax_factory.rs | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/crates/syntax/src/ast/syntax_factory.rs b/crates/syntax/src/ast/syntax_factory.rs new file mode 100644 index 0000000000..73bbe49105 --- /dev/null +++ b/crates/syntax/src/ast/syntax_factory.rs @@ -0,0 +1,45 @@ +//! Builds upon [`crate::ast::make`] constructors to create ast fragments with +//! optional syntax mappings. +//! +//! Instead of forcing make constructors to perform syntax mapping, we instead +//! let [`SyntaxFactory`] handle constructing the mappings. Care must be taken +//! to remember to feed the syntax mappings into a [`SyntaxEditor`](crate::syntax_editor::SyntaxEditor), +//! if applicable. + +mod constructors; + +use std::cell::{RefCell, RefMut}; + +use crate::syntax_editor::SyntaxMapping; + +pub struct SyntaxFactory { + // Stored in a refcell so that the factory methods can be &self + mappings: Option<RefCell<SyntaxMapping>>, +} + +impl SyntaxFactory { + /// Creates a new [`SyntaxFactory`], generating mappings between input nodes and generated nodes. + pub fn new() -> Self { + Self { mappings: Some(RefCell::new(SyntaxMapping::new())) } + } + + /// Creates a [`SyntaxFactory`] without generating mappings. + pub fn without_mappings() -> Self { + Self { mappings: None } + } + + /// Gets all of the tracked syntax mappings, if any. + pub fn finish_with_mappings(self) -> SyntaxMapping { + self.mappings.unwrap_or_default().into_inner() + } + + fn mappings(&self) -> Option<RefMut<'_, SyntaxMapping>> { + self.mappings.as_ref().map(|it| it.borrow_mut()) + } +} + +impl Default for SyntaxFactory { + fn default() -> Self { + Self::without_mappings() + } +} |