1 files changed, 116 insertions, 0 deletions

diff --git a/lua-bindings/src/lib.rs b/lua-bindings/src/lib.rs
new file mode 100644
index 0000000..6628ee2
--- /dev/null
+++ b/lua-bindings/src/lib.rs
@@ -0,0 +1,116 @@
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+use diaphragm_core::{
+    solving::VariableHandle,
+    text::{FontDescription as CoreFontDescription, FontStyle, FontWeight, Text as CoreText},
+    types::Float as CoreFloat,
+};
+// use diaphragm_cairo_renderer::CairoRenderer;
+// use diaphragm_core::Runtime;
+// use diaphragm_z3_solver::{z3, Z3Context};
+use mlua::prelude::*;
+
+static MAX_ID: AtomicUsize = AtomicUsize::new(0);
+
+#[derive(Clone, Copy, Debug)]
+struct Float(CoreFloat);
+
+impl Float {
+    fn new() -> Float {
+        Float(CoreFloat::Variable(VariableHandle::new(
+            MAX_ID.fetch_add(1, Ordering::SeqCst),
+        )))
+    }
+}
+impl LuaUserData for Float {}
+
+fn float(_: &Lua, _: ()) -> LuaResult<Float> {
+    Ok(Float::new())
+}
+
+#[derive(Clone, Debug)]
+struct FontDescription(CoreFontDescription);
+impl LuaUserData for FontDescription {}
+
+const DEFAULT_FONT_FAMILY: &str = "serif";
+
+impl Default for FontDescription {
+    fn default() -> Self {
+        Self(CoreFontDescription {
+            family: DEFAULT_FONT_FAMILY.to_string(),
+            style: FontStyle::Normal,
+            weight: FontWeight::Normal,
+            size: Float::new().0,
+        })
+    }
+}
+
+fn font(_: &Lua, params: LuaTable) -> LuaResult<FontDescription> {
+    // TODO: better validation of the table
+    // What happens when I mistype a param?
+    // TODO: better error handling
+
+    let family = params
+        .get::<_, Option<_>>("family")?
+        .unwrap_or_else(|| DEFAULT_FONT_FAMILY.to_string());
+
+    let style = match params.get::<_, Option<String>>("style")?.as_deref() {
+        Some("normal") | None => FontStyle::Normal,
+        Some(_) => return Err(LuaError::RuntimeError("Unknown style".to_string())),
+    };
+
+    let weight = match params.get::<_, Option<String>>("weight")?.as_deref() {
+        Some("normal") | None => FontWeight::Normal,
+        Some(_) => return Err(LuaError::RuntimeError("Unknown weight".to_string())),
+    };
+
+    let size = params
+        .get::<_, Option<_>>("size")?
+        .unwrap_or_else(Float::new);
+
+    Ok(FontDescription(CoreFontDescription {
+        family,
+        style,
+        weight,
+        size: size.0,
+    }))
+}
+
+#[derive(Clone, Debug)]
+struct Text(CoreText);
+impl LuaUserData for Text {}
+
+fn text(_: &Lua, params: LuaTable) -> LuaResult<Text> {
+    let content = params.get("content")?;
+
+    let font = params
+        .get::<_, Option<FontDescription>>("font")?
+        .unwrap_or_default();
+
+    Ok(Text(CoreText {
+        content,
+        font: font.0,
+    }))
+}
+
+fn draw(_: &Lua, params: LuaTable) -> LuaResult<()> {
+    let content: LuaTable = params.get("content")?;
+    let output: LuaTable = params.get("output")?;
+
+    dbg!(content, output);
+
+    Ok(())
+}
+
+#[mlua::lua_module]
+fn libdiaphragm(lua: &Lua) -> LuaResult<LuaTable> {
+    // TODO: the solver as a mutable global solves so much problem (pun not intended)
+    let exports = lua.create_table()?;
+    exports.set("text", lua.create_function(text)?)?;
+    exports.set("font", lua.create_function(font)?)?;
+    exports.set("float", lua.create_function(float)?)?;
+
+    exports.set("draw", lua.create_function(draw)?)?;
+
+    Ok(exports)
+}