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76 lines
2.1 KiB
Rust
76 lines
2.1 KiB
Rust
//! These are macros to make getting very nested fields in the `Editor` struct easier
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//! These are macros instead of functions because functions will have to take `&mut self`
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//! However, rust doesn't know that you only want a partial borrow instead of borrowing the
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//! entire struct which `&mut self` says. This makes it impossible to do other mutable
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//! stuff to the struct because it is already borrowed. Because macros are expanded,
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//! this circumvents the problem because it is just like indexing fields by hand and then
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//! putting a `&mut` in front of it. This way rust can see that we are only borrowing a
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//! part of the struct and not the entire thing.
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/// Get the current view and document mutably as a tuple.
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/// Returns `(&mut View, &mut Document)`
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#[macro_export]
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macro_rules! current {
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($editor:expr) => {{
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let view = $crate::view_mut!($editor);
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let id = view.doc;
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let doc = $crate::doc_mut!($editor, &id);
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(view, doc)
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}};
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}
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#[macro_export]
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macro_rules! current_ref {
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($editor:expr) => {{
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let view = $editor.tree.get($editor.tree.focus);
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let doc = &$editor.documents[&view.doc];
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(view, doc)
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}};
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}
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/// Get the current document mutably.
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/// Returns `&mut Document`
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#[macro_export]
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macro_rules! doc_mut {
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($editor:expr, $id:expr) => {{
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$editor.documents.get_mut($id).unwrap()
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}};
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($editor:expr) => {{
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$crate::current!($editor).1
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}};
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}
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/// Get the current view mutably.
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/// Returns `&mut View`
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#[macro_export]
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macro_rules! view_mut {
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($editor:expr, $id:expr) => {{
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$editor.tree.get_mut($id)
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}};
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($editor:expr) => {{
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$editor.tree.get_mut($editor.tree.focus)
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}};
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}
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/// Get the current view immutably
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/// Returns `&View`
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#[macro_export]
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macro_rules! view {
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($editor:expr, $id:expr) => {{
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$editor.tree.get($id)
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}};
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($editor:expr) => {{
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$editor.tree.get($editor.tree.focus)
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}};
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}
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#[macro_export]
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macro_rules! doc {
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($editor:expr, $id:expr) => {{
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&$editor.documents[$id]
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}};
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($editor:expr) => {{
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$crate::current_ref!($editor).1
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}};
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}
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