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https://github.com/isar/rusqlite.git
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Introduce macro to avoid code duplication
This commit is contained in:
gwenn
Thom Chiovoloni
153
src/vtab/mod.rs
153
src/vtab/mod.rs
@@ -97,36 +97,26 @@ const ZERO_MODULE: ffi::sqlite3_module = unsafe {
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.module
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};
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/// Create an modifiable virtual table implementation.
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///
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/// Step 2 of [Creating New Virtual Table Implementations](https://sqlite.org/vtab.html#creating_new_virtual_table_implementations).
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#[must_use]
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pub fn update_module<'vtab, T: UpdateVTab<'vtab>>() -> &'static Module<'vtab, T> {
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macro_rules! module {
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($lt:lifetime, $vt:ty, $ct:ty, $xc:expr, $xd:expr, $xu:expr) => {
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#[allow(clippy::needless_update)]
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&Module {
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base: ffi::sqlite3_module {
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// We don't use V3
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iVersion: 2,
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xCreate: match T::KIND {
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VTabKind::EponymousOnly => None,
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VTabKind::Eponymous => Some(rust_connect::<T>),
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_ => Some(rust_create::<T>),
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},
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xConnect: Some(rust_connect::<T>),
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xBestIndex: Some(rust_best_index::<T>),
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xDisconnect: Some(rust_disconnect::<T>),
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xDestroy: match T::KIND {
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VTabKind::EponymousOnly => None,
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VTabKind::Eponymous => Some(rust_disconnect::<T>),
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_ => Some(rust_destroy::<T>),
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},
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xOpen: Some(rust_open::<T>),
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xClose: Some(rust_close::<T::Cursor>),
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xFilter: Some(rust_filter::<T::Cursor>),
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xNext: Some(rust_next::<T::Cursor>),
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xEof: Some(rust_eof::<T::Cursor>),
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xColumn: Some(rust_column::<T::Cursor>),
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xRowid: Some(rust_rowid::<T::Cursor>),
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xUpdate: Some(rust_update::<T>),
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xCreate: $xc,
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xConnect: Some(rust_connect::<$vt>),
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xBestIndex: Some(rust_best_index::<$vt>),
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xDisconnect: Some(rust_disconnect::<$vt>),
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xDestroy: $xd,
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xOpen: Some(rust_open::<$vt>),
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xClose: Some(rust_close::<$ct>),
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xFilter: Some(rust_filter::<$ct>),
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xNext: Some(rust_next::<$ct>),
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xEof: Some(rust_eof::<$ct>),
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xColumn: Some(rust_column::<$ct>),
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xRowid: Some(rust_rowid::<$ct>), // FIXME optional
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xUpdate: $xu,
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xBegin: None,
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xSync: None,
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xCommit: None,
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@@ -138,7 +128,26 @@ pub fn update_module<'vtab, T: UpdateVTab<'vtab>>() -> &'static Module<'vtab, T>
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xRollbackTo: None,
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..ZERO_MODULE
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},
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phantom: PhantomData::<&'vtab T>,
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phantom: PhantomData::<&$lt $vt>,
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}
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};
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}
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/// Create an modifiable virtual table implementation.
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///
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/// Step 2 of [Creating New Virtual Table Implementations](https://sqlite.org/vtab.html#creating_new_virtual_table_implementations).
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#[must_use]
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pub fn update_module<'vtab, T: UpdateVTab<'vtab>>() -> &'static Module<'vtab, T> {
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match T::KIND {
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VTabKind::EponymousOnly => {
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module!('vtab, T, T::Cursor, None, None, Some(rust_update::<T>))
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}
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VTabKind::Eponymous => {
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module!('vtab, T, T::Cursor, Some(rust_connect::<T>), Some(rust_disconnect::<T>), Some(rust_update::<T>))
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}
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_ => {
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module!('vtab, T, T::Cursor, Some(rust_create::<T>), Some(rust_destroy::<T>), Some(rust_update::<T>))
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}
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}
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}
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@@ -147,46 +156,18 @@ pub fn update_module<'vtab, T: UpdateVTab<'vtab>>() -> &'static Module<'vtab, T>
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/// Step 2 of [Creating New Virtual Table Implementations](https://sqlite.org/vtab.html#creating_new_virtual_table_implementations).
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#[must_use]
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pub fn read_only_module<'vtab, T: CreateVTab<'vtab>>() -> &'static Module<'vtab, T> {
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// The xConnect and xCreate methods do the same thing, but they must be
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// different so that the virtual table is not an eponymous virtual table.
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#[allow(clippy::needless_update)]
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&Module {
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base: ffi::sqlite3_module {
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// We don't use V3
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iVersion: 2, // We don't use V2 or V3 features in read_only_module types
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xCreate: match T::KIND {
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VTabKind::EponymousOnly => None,
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VTabKind::Eponymous => Some(rust_connect::<T>),
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_ => Some(rust_create::<T>),
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},
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xConnect: Some(rust_connect::<T>),
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xBestIndex: Some(rust_best_index::<T>),
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xDisconnect: Some(rust_disconnect::<T>),
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xDestroy: match T::KIND {
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VTabKind::EponymousOnly => None,
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VTabKind::Eponymous => Some(rust_disconnect::<T>),
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_ => Some(rust_destroy::<T>),
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},
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xOpen: Some(rust_open::<T>),
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xClose: Some(rust_close::<T::Cursor>),
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xFilter: Some(rust_filter::<T::Cursor>),
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xNext: Some(rust_next::<T::Cursor>),
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xEof: Some(rust_eof::<T::Cursor>),
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xColumn: Some(rust_column::<T::Cursor>),
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xRowid: Some(rust_rowid::<T::Cursor>),
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xUpdate: None,
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xBegin: None,
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xSync: None,
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xCommit: None,
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xRollback: None,
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xFindFunction: None,
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xRename: None,
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xSavepoint: None,
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xRelease: None,
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xRollbackTo: None,
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..ZERO_MODULE
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},
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phantom: PhantomData::<&'vtab T>,
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match T::KIND {
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VTabKind::EponymousOnly => eponymous_only_module(),
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VTabKind::Eponymous => {
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// A virtual table is eponymous if its xCreate method is the exact same function
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// as the xConnect method
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module!('vtab, T, T::Cursor, Some(rust_connect::<T>), Some(rust_disconnect::<T>), None)
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}
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_ => {
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// The xConnect and xCreate methods may do the same thing, but they must be
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// different so that the virtual table is not an eponymous virtual table.
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module!('vtab, T, T::Cursor, Some(rust_create::<T>), Some(rust_destroy::<T>), None)
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}
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}
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}
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@@ -195,40 +176,8 @@ pub fn read_only_module<'vtab, T: CreateVTab<'vtab>>() -> &'static Module<'vtab,
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/// Step 2 of [Creating New Virtual Table Implementations](https://sqlite.org/vtab.html#creating_new_virtual_table_implementations).
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#[must_use]
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pub fn eponymous_only_module<'vtab, T: VTab<'vtab>>() -> &'static Module<'vtab, T> {
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// A virtual table is eponymous if its xCreate method is the exact same function
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// as the xConnect method For eponymous-only virtual tables, the xCreate
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// method is NULL
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#[allow(clippy::needless_update)]
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&Module {
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base: ffi::sqlite3_module {
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// We don't use V3
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iVersion: 2,
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xCreate: None,
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xConnect: Some(rust_connect::<T>),
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xBestIndex: Some(rust_best_index::<T>),
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xDisconnect: Some(rust_disconnect::<T>),
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xDestroy: None,
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xOpen: Some(rust_open::<T>),
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xClose: Some(rust_close::<T::Cursor>),
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xFilter: Some(rust_filter::<T::Cursor>),
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xNext: Some(rust_next::<T::Cursor>),
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xEof: Some(rust_eof::<T::Cursor>),
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xColumn: Some(rust_column::<T::Cursor>),
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xRowid: Some(rust_rowid::<T::Cursor>),
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xUpdate: None,
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xBegin: None,
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xSync: None,
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xCommit: None,
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xRollback: None,
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xFindFunction: None,
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xRename: None,
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xSavepoint: None,
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xRelease: None,
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xRollbackTo: None,
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..ZERO_MODULE
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},
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phantom: PhantomData::<&'vtab T>,
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}
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// For eponymous-only virtual tables, the xCreate method is NULL
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module!('vtab, T, T::Cursor, None, None, None)
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}
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/// Virtual table configuration options
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@@ -350,7 +299,7 @@ pub trait CreateVTab<'vtab>: VTab<'vtab> {
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}
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}
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/// Non-read-only virtual table instance trait.
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/// Writable virtual table instance trait.
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///
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/// (See [SQLite doc](https://sqlite.org/vtab.html#xupdate))
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pub trait UpdateVTab<'vtab>: CreateVTab<'vtab> {
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