wip: fix(input): grr

todo: per-key inptut map layering

input/src/input_dsl.rs

@@ -1,43 +1,71 @@
 use crate::*;
-
-/// A collection of input bindings.
+/// A collection of input bind.
 ///
 /// Each contained layer defines a mapping from input event to command invocation
-/// over a given state. Furthermore, each layer may have an associated condition,
+/// over a given state. Furthermore, each layer may have an associated cond,
 /// so that only certain layers are active at a given time depending on state.
-#[derive(Debug)] pub struct InputLayers<T: Dsl>(Vec<InputLayer<T>>);
-/// A single input binding layer.
-#[derive(Default, Debug)] struct InputLayer<T: Dsl> {
-    condition: Option<DslVal<T::Str, T::Exp>>,
-    bindings:  DslVal<T::Str, T::Exp>,
-}
-/// Input layers start out empty regardless if `T` implements [Default].
-impl<T: Dsl> Default for InputLayers<T> { fn default () -> Self { Self(vec![]) } }
-/// Bring up an input layer map from a string representation.
-impl<'s> From<&'s str> for InputLayers<Ast> {
-    fn from (source: &'s str) -> Self {
-        let mut layers = vec![];
-        let mut source = CstIter::from(source);
-        while let Some(cst) = source.next() {
-            panic!("{:?}", cst.value);
-            layers.push(match cst.value.exp_head().map(|x|x.as_key()).flatten() {
-                Some("layer") => InputLayer {
-                    condition: None,
-                    bindings:  dsl_val(source.nth(1).unwrap()),
-                },
-                Some("layer-if") => InputLayer {
-                    condition: Some(dsl_val(source.nth(1).unwrap())),
-                    bindings:  dsl_val(source.nth(2).unwrap()),
-                },
-                _ => panic!("this shoulda been a TryFrom"),
-            });
+#[derive(Debug, Default)] pub struct InputMap<I, T: Dsl>(std::collections::BTreeMap<I, T>);
+impl<I, T: Dsl> InputMap<I, T> {
+    /// Create input layer collection from path to text file.
+    pub fn from_path <P: Debug + AsRef<Path>> (path: P) -> Usually<Self> {
+        if !exists(path.as_ref())? {
+            return Err(format!("(e5) not found: {path:?}").into())
         }
-        Self(layers)
+        Self::from_source(read_and_leak(path)?)
     }
-}
-
-impl<T: Dsl> InputLayers<T> {
-    /// Create an input map with a single non-conditional layer.
+    /// Create input layer collection from string.
+    pub fn from_source <S: AsRef<str>> (source: S) -> Usually<Self> {
+        Self::from_dsl(CstIter::from(source.as_ref()))
+    }
+    /// Create input layer collection from DSL.
+    pub fn from_dsl (dsl: impl Dsl) -> Usually<Self> {
+        use DslVal::*;
+        let mut input_map: Self = Self(Default::default());
+        while let Exp(_, mut exp) = dsl.val() {
+            let val = exp.nth(0).map(|x|x.val());
+            match val {
+                Some(Str(path)) => {
+                    let path = PathBuf::from(path.as_ref());
+                    let module = InputMap::<I, T>::from_path(&path)?;
+                    for (key, val) in module.0.into_iter() {
+                    }
+                },
+                Some(Exp(_, expr)) if let Some(Sym(sym)) = expr.nth(0) => {
+                    //input_map.unconditional.push(expr);
+                    todo!("binding");
+                },
+                Some(Exp(_, expr)) if let Some(Key(key)) = expr.nth(0) && key.as_ref() == "if" => {
+                    todo!("conditional binding");
+                },
+                _ => return Result::Err(format!("invalid token in keymap: {val:?}").into()),
+            }
+        }
+        Ok(input_map)
+    }
+    /// Evaluate the active layers for a given state,
+    /// returning the command to be executed, if any.
+    pub fn handle <S, O> (&self, state: &mut S, input: I) -> Perhaps<O> where
+        S: DslInto<bool> + DslInto<O>,
+        O: Command<S>
+    {
+        todo!();
+        //let layers = self.0.as_slice();
+        //for InputLayer { cond, bind } in layers.iter() {
+            //let mut matches = true;
+            //if let Some(cond) = cond {
+                //matches = state.dsl_into(cond, ||format!("input: no cond").into())?;
+            //}
+            //if matches
+            //&& let Some(exp) = bind.val().exp_head()
+            //&& input.dsl_into(exp, ||format!("InputMap: input.eval(binding) failed").into())?
+            //&& let Some(command) = state.try_dsl_into(exp)? {
+                //return Ok(Some(command))
+            //}
+        //}
+        Ok(None)
+    }
+    /*
+    /// Create an input map with a single non-condal layer.
     /// (Use [Default::default] to get an empty map.)
     pub fn new (layer: DslVal<T::Str, T::Exp>) -> Self {
         Self::default().layer(layer)
@@ -46,39 +74,128 @@ impl<T: Dsl> InputLayers<T> {
     pub fn layer (mut self, layer: DslVal<T::Str, T::Exp>) -> Self {
         self.add_layer(layer); self
     }
-    /// Add conditional layer, return `Self`.
-    pub fn layer_if (mut self, condition: DslVal<T::Str, T::Exp>, layer: DslVal<T::Str, T::Exp>) -> Self {
-        self.add_layer_if(Some(condition), layer); self
+    /// Add condal layer, return `Self`.
+    pub fn layer_if (mut self, cond: DslVal<T::Str, T::Exp>, layer: DslVal<T::Str, T::Exp>) -> Self {
+        self.add_layer_if(Some(cond), layer); self
     }
     /// Add layer, return `&mut Self`.
     pub fn add_layer (&mut self, layer: DslVal<T::Str, T::Exp>) -> &mut Self {
         self.add_layer_if(None, layer.into()); self
     }
-    /// Add conditional layer, return `&mut Self`.
-    pub fn add_layer_if (&mut self, condition: Option<DslVal<T::Str, T::Exp>>, bindings: DslVal<T::Str, T::Exp>) -> &mut Self {
-        self.0.push(InputLayer { condition, bindings });
+    /// Add condal layer, return `&mut Self`.
+    pub fn add_layer_if (&mut self, cond: Option<DslVal<T::Str, T::Exp>>, bind: DslVal<T::Str, T::Exp>) -> &mut Self {
+        self.0.push(InputLayer { cond, bind });
         self
     }
-    /// Evaluate the active layers for a given state,
-    /// returning the command to be executed, if any.
-    pub fn handle <S, I, O> (&self, state: &mut S, input: I) -> Perhaps<O> where
-        S: DslInto<bool> + DslInto<O>,
-        I: DslInto<bool>,
-        O: Command<S>
-    {
-        let layers = self.0.as_slice();
-        for InputLayer { condition, bindings } in layers.iter() {
-            let mut matches = true;
-            if let Some(condition) = condition {
-                matches = state.dsl_into(condition, ||format!("input: no condition").into())?;
-            }
-            if matches
-            && let Some(exp) = bindings.val().exp_head()
-            && input.dsl_into(exp, ||format!("InputLayers: input.eval(binding) failed").into())?
-            && let Some(command) = state.try_dsl_into(exp)? {
-                return Ok(Some(command))
-            }
-        }
-        Ok(None)
-    }
+    */
+}
+
+
+
+        //let mut keys = iter.unwrap();
+        //let mut map  = InputMap::default();
+        //while let Some(token) = keys.next() {
+            //if let Value::Exp(_, mut exp) = token.value {
+                //let next = exp.next();
+                //if let Some(Token { value: Value::Key(sym), .. }) = next {
+                    //match sym {
+                        //"layer" => {
+                            //if let Some(Token { value: Value::Str(path), .. }) = exp.peek() {
+                                //let path = base.as_ref().parent().unwrap().join(unquote(path));
+                                //if !std::fs::exists(&path)? {
+                                    //return Err(format!("(e5) not found: {path:?}").into())
+                                //}
+                                //map.add_layer(read_and_leak(path)?.into());
+                                //print!("layer:\n  path: {:?}...", exp.0.0.trim());
+                                //println!("ok");
+                            //} else {
+                                //return Err(format!("(e4) unexpected non-string {next:?}").into())
+                            //}
+                        //},
+
+                        //"layer-if" => {
+                            //let mut cond = None;
+
+                            //if let Some(Token { value: Value::Sym(sym), .. }) = exp.next() {
+                                //cond = Some(leak(sym));
+                            //} else {
+                                //return Err(format!("(e4) unexpected non-symbol {next:?}").into())
+                            //};
+
+                            //if let Some(Token { value: Value::Str(path), .. }) = exp.peek() {
+                                //let path = base.as_ref().parent().unwrap().join(unquote(path));
+                                //if !std::fs::exists(&path)? {
+                                    //return Err(format!("(e5) not found: {path:?}").into())
+                                //}
+                                //print!("layer-if:\n  cond: {}\n  path: {path:?}...",
+                                    //cond.unwrap_or_default());
+                                //let keys = read_and_leak(path)?.into();
+                                //let cond = cond.unwrap();
+                                //println!("ok");
+                                //map.add_layer_if(
+                                    //Box::new(move |state: &App|Take::take_or_fail(
+                                        //state, exp, ||"missing input layer conditional"
+                                    //)), keys
+                                //);
+                            //} else {
+                                //return Err(format!("(e4) unexpected non-symbol {next:?}").into())
+                            //}
+                        //},
+
+                        //_ => return Err(format!("(e3) unexpected symbol {sym:?}").into())
+                    //}
+                //} else {
+                    //return Err(format!("(e2) unexpected exp {:?}", next.map(|x|x.value)).into())
+                //}
+            //} else {
+                //return Err(format!("(e1) unexpected token {token:?}").into())
+            //}
+        //}
+        //Ok(map)
+    //}
+//{
+//}
+    //fn from (source: &'s str) -> Self {
+        //// this should be for single layer:
+        //use DslVal::*;
+        //let mut layers = vec![];
+        //let mut source = CstIter::from(source);
+        //while let Some(Exp(_, mut iter)) = source.next().map(|x|x.value) {
+            //let mut iter = iter.clone();
+            //layers.push(match iter.next().map(|x|x.value) {
+                //Some(Sym(sym)) if sym.starts_with("@") => InputLayer {
+                    //cond: None,
+                    //bind: vec![[
+                        //dsl_val(source.nth(1).unwrap()),
+                        //dsl_val(source.nth(2).unwrap()),
+                    //]],
+                //},
+                //Some(Str(layer)) => InputLayer {
+                    //cond: None,
+                    //bind: dsl_val(source.nth(1).unwrap()),
+                //},
+                //Some(Key("if")) => InputLayer {
+                    //cond: Some(dsl_val(source.nth(1).unwrap())),
+                    //bind: dsl_val(source.nth(2).unwrap()),
+                //},
+                //_ => panic!("invalid token in keymap"),
+            //})
+        //}
+        //Self(layers)
+    //}
+//}
+
+fn unquote (x: &str) -> &str {
+    let mut chars = x.chars();
+    chars.next();
+    //chars.next_back();
+    chars.as_str()
+}
+
+fn read_and_leak (path: impl AsRef<Path>) -> Usually<&'static str> {
+    Ok(leak(String::from_utf8(std::fs::read(path.as_ref())?)?))
+}
+
+fn leak (x: impl AsRef<str>) -> &'static str {
+    Box::leak(x.as_ref().into())
 }

input/src/lib.rs

@@ -1,6 +1,10 @@
 #![feature(associated_type_defaults)]
 #![feature(if_let_guard)]
 
+pub(crate) use std::fmt::Debug;
+pub(crate) use std::collections::BTreeMap;
+pub(crate) use std::path::{Path, PathBuf};
+pub(crate) use std::fs::exists;
 pub(crate) use tengri_core::*;
 
 mod input_macros;