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``bidi::ffi``
=============
.. cpp:class:: ICU4XBidi
An ICU4X Bidi object, containing loaded bidi data
See the `Rust documentation for BidiClassAdapter <https://docs.rs/icu/latest/icu/properties/bidi/struct.BidiClassAdapter.html>`__ for more information.
.. cpp:function:: static diplomat::result<ICU4XBidi, ICU4XError> create(const ICU4XDataProvider& provider)
Creates a new :cpp:class:`ICU4XBidi` from locale data.
See the `Rust documentation for new <https://docs.rs/icu/latest/icu/properties/bidi/struct.BidiClassAdapter.html#method.new>`__ for more information.
.. cpp:function:: ICU4XBidiInfo for_text(const std::string_view text, uint8_t default_level) const
Use the data loaded in this object to process a string and calculate bidi information
Takes in a Level for the default level, if it is an invalid value it will default to LTR
See the `Rust documentation for new_with_data_source <https://docs.rs/unicode_bidi/latest/unicode_bidi/struct.BidiInfo.html#method.new_with_data_source>`__ for more information.
Lifetimes: ``text`` must live at least as long as the output.
.. cpp:function:: ICU4XReorderedIndexMap reorder_visual(const diplomat::span<const uint8_t> levels) const
Utility function for producing reorderings given a list of levels
Produces a map saying which visual index maps to which source index.
The levels array must not have values greater than 126 (this is the Bidi maximum explicit depth plus one). Failure to follow this invariant may lead to incorrect results, but is still safe.
See the `Rust documentation for reorder_visual <https://docs.rs/unicode_bidi/latest/unicode_bidi/struct.BidiInfo.html#method.reorder_visual>`__ for more information.
.. cpp:function:: static bool level_is_rtl(uint8_t level)
Check if a Level returned by level_at is an RTL level.
Invalid levels (numbers greater than 125) will be assumed LTR
See the `Rust documentation for is_rtl <https://docs.rs/unicode_bidi/latest/unicode_bidi/struct.Level.html#method.is_rtl>`__ for more information.
.. cpp:function:: static bool level_is_ltr(uint8_t level)
Check if a Level returned by level_at is an LTR level.
Invalid levels (numbers greater than 125) will be assumed LTR
See the `Rust documentation for is_ltr <https://docs.rs/unicode_bidi/latest/unicode_bidi/struct.Level.html#method.is_ltr>`__ for more information.
.. cpp:function:: static uint8_t level_rtl()
Get a basic RTL Level value
See the `Rust documentation for rtl <https://docs.rs/unicode_bidi/latest/unicode_bidi/struct.Level.html#method.rtl>`__ for more information.
.. cpp:function:: static uint8_t level_ltr()
Get a simple LTR Level value
See the `Rust documentation for ltr <https://docs.rs/unicode_bidi/latest/unicode_bidi/struct.Level.html#method.ltr>`__ for more information.
.. cpp:enum-struct:: ICU4XBidiDirection
.. cpp:enumerator:: Ltr
.. cpp:enumerator:: Rtl
.. cpp:enumerator:: Mixed
.. cpp:class:: ICU4XBidiInfo
An object containing bidi information for a given string, produced by ``for_text()`` on ``ICU4XBidi``
See the `Rust documentation for BidiInfo <https://docs.rs/unicode_bidi/latest/unicode_bidi/struct.BidiInfo.html>`__ for more information.
.. cpp:function:: size_t paragraph_count() const
The number of paragraphs contained here
.. cpp:function:: std::optional<ICU4XBidiParagraph> paragraph_at(size_t n) const
Get the nth paragraph, returning ``None`` if out of bounds
Lifetimes: ``this`` must live at least as long as the output.
.. cpp:function:: size_t size() const
The number of bytes in this full text
.. cpp:function:: uint8_t level_at(size_t pos) const
Get the BIDI level at a particular byte index in the full text. This integer is conceptually a ``unicode_bidi::Level``, and can be further inspected using the static methods on ICU4XBidi.
Returns 0 (equivalent to ``Level::ltr()``) on error
.. cpp:class:: ICU4XBidiParagraph
Bidi information for a single processed paragraph
.. cpp:function:: diplomat::result<std::monostate, ICU4XError> set_paragraph_in_text(size_t n)
Given a paragraph index ``n`` within the surrounding text, this sets this object to the paragraph at that index. Returns ``ICU4XError::OutOfBoundsError`` when out of bounds.
This is equivalent to calling ``paragraph_at()`` on ``ICU4XBidiInfo`` but doesn't create a new object
.. cpp:function:: ICU4XBidiDirection direction() const
The primary direction of this paragraph
See the `Rust documentation for level_at <https://docs.rs/unicode_bidi/latest/unicode_bidi/struct.Paragraph.html#method.level_at>`__ for more information.
.. cpp:function:: size_t size() const
The number of bytes in this paragraph
See the `Rust documentation for len <https://docs.rs/unicode_bidi/latest/unicode_bidi/struct.ParagraphInfo.html#method.len>`__ for more information.
.. cpp:function:: size_t range_start() const
The start index of this paragraph within the source text
.. cpp:function:: size_t range_end() const
The end index of this paragraph within the source text
.. cpp:function:: template<typename W> diplomat::result<std::monostate, ICU4XError> reorder_line_to_writeable(size_t range_start, size_t range_end, W& out) const
Reorder a line based on display order. The ranges are specified relative to the source text and must be contained within this paragraph's range.
See the `Rust documentation for level_at <https://docs.rs/unicode_bidi/latest/unicode_bidi/struct.Paragraph.html#method.level_at>`__ for more information.
.. cpp:function:: diplomat::result<std::string, ICU4XError> reorder_line(size_t range_start, size_t range_end) const
Reorder a line based on display order. The ranges are specified relative to the source text and must be contained within this paragraph's range.
See the `Rust documentation for level_at <https://docs.rs/unicode_bidi/latest/unicode_bidi/struct.Paragraph.html#method.level_at>`__ for more information.
.. cpp:function:: uint8_t level_at(size_t pos) const
Get the BIDI level at a particular byte index in this paragraph. This integer is conceptually a ``unicode_bidi::Level``, and can be further inspected using the static methods on ICU4XBidi.
Returns 0 (equivalent to ``Level::ltr()``) on error
See the `Rust documentation for level_at <https://docs.rs/unicode_bidi/latest/unicode_bidi/struct.Paragraph.html#method.level_at>`__ for more information.
.. cpp:class:: ICU4XReorderedIndexMap
Thin wrapper around a vector that maps visual indices to source indices
``map[visualIndex] = sourceIndex``
Produced by ``reorder_visual()`` on :cpp:class:`ICU4XBidi`.
.. cpp:function:: const diplomat::span<const size_t> as_slice() const
Get this as a slice/array of indices
Lifetimes: ``this`` must live at least as long as the output.
.. cpp:function:: size_t len() const
The length of this map
.. cpp:function:: size_t get(size_t index) const
Get element at ``index``. Returns 0 when out of bounds (note that 0 is also a valid in-bounds value, please use ``len()`` to avoid out-of-bounds)
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