[native] Start porting all jni code to rust #8

The first parts of ProximityInfo have been fully ported.

native/rust/src/defines.rs

@@ -0,0 +1,9 @@
+// TODO: move constants to more reasonable locations in the future
+// constants from defines.h
+
+/// The max number of the keys in one keyboard layout
+pub const MAX_KEY_COUNT_IN_A_KEYBOARD: usize = 64;
+
+pub const KEYCODE_SPACE: char = ' ';
+pub const KEYCODE_SINGLE_QUOTE: char = '\'';
+pub const KEYCODE_HYPHEN_MINUS: char = '-';

native/rust/src/lib.rs

@@ -1,3 +1,6 @@
+mod defines;
 mod emojisearch;
 mod expect_droid;
 mod log;
+mod math;
+mod suggest;

native/rust/src/math.rs

@@ -0,0 +1,14 @@
+#[inline]
+pub fn square_float(x: f32) -> f32 {
+    x * x
+}
+
+#[inline]
+pub fn get_distance_int(x1: i32, y1: i32, x2: i32, y2: i32) -> i32 {
+    ((x1 - x2) as f32).hypot((y1 - y2) as f32) as i32
+}
+
+#[inline]
+pub fn get_distance(x1: f32, y1: f32, x2: f32, y2: f32) -> i32 {
+    (x1 - x2).hypot(y1 - y2) as i32
+}

native/rust/src/suggest.rs

@@ -0,0 +1,2 @@
+mod core;
+mod entrypoints;

native/rust/src/suggest/core.rs

@@ -0,0 +1 @@
+pub(crate) mod layout;

native/rust/src/suggest/core/layout.rs

@@ -0,0 +1,2 @@
+pub(crate) mod proximity_info;
+mod proximity_info_params;