AstToken -> Ast <- AstValue

dsl/src/dsl_ast.rs

@@ -2,15 +2,21 @@ use crate::*;
 use std::sync::Arc;
 use std::borrow::Cow;
 
-/// Owns its values, and has no metadata.
-#[derive(PartialEq, Clone, Default, Debug)]
-pub struct AstToken(pub AstValue, pub AstMeta);
-
 #[derive(Debug, Copy, Clone, Default, PartialEq)]
-pub struct AstMeta;
-
-pub type AstValue = Value<Arc<str>, Vec<AstToken>>;
-impl<'source> From<CstValue<'source>> for AstValue {
+pub struct AstIter;
+impl<'source> From<SourceIter<'source>> for AstIter {
+    fn from (source: SourceIter<'source>) -> Self {
+        Self // TODO
+    }
+}
+/// Owns its values, and has no metadata.
+pub type Ast = Value<Arc<str>, AstIter>;
+impl<'source> From<CstToken<'source>> for Ast {
+    fn from (token: CstToken<'source>) -> Self {
+        token.value().into()
+    }
+}
+impl<'source> From<CstValue<'source>> for Ast {
     fn from (value: CstValue<'source>) -> Self {
         use Value::*;
         match value {
@@ -24,11 +30,3 @@ impl<'source> From<CstValue<'source>> for AstValue {
         }
     }
 }
-
-pub trait AstIter: DslIter<Token = AstToken> {}
-
-//impl<'source> From<CstExp<'source>> for AstExp {
-    //fn from (exp: CstExp<'source>) -> AstExp {
-        //AstExp(exp.words.map(|token|Token(AstValue::from(token.value()), AstMeta,)).collect())
-    //}
-//}

dsl/src/dsl_display.rs

@@ -1,6 +1,6 @@
 use crate::*;
 use std::fmt::{Debug, Display, Formatter, Error as FormatError};
-impl Display for AstValue {
+impl Display for Ast {
     fn fmt (&self, out: &mut Formatter) -> Result<(), FormatError> {
         use Value::*;
         write!(out, "{}", match self {

dsl/src/dsl_iter.rs

@@ -43,18 +43,12 @@ impl<'source> Into<Vec<CstToken<'source>>> for SourceIter<'source> {
     }
 }
 
-impl<'source> Into<Vec<AstToken>> for SourceIter<'source> {
-    fn into (self) -> Vec<AstToken> {
+impl<'source> Into<Vec<Ast>> for SourceIter<'source> {
+    fn into (self) -> Vec<Ast> {
         self.map(Into::into).collect()
     }
 }
 
-impl<'source> From<CstToken<'source>> for AstToken {
-    fn from (value: CstToken<'source>) -> Self {
-        Self(value.0.into(), AstMeta)
-    }
-}
-
 /// Implement the const iterator pattern.
 #[macro_export] macro_rules! const_iter {
     ($(<$l:lifetime>)?|$self:ident: $Struct:ty| => $Item:ty => $expr:expr) => {

input/src/input_dsl.rs

@@ -4,35 +4,33 @@ use std::fmt::Debug;
 
 #[derive(Default, Debug)] pub struct InputLayers(Vec<InputLayer>);
 
-#[derive(Default, Debug)] pub struct InputLayer(Option<Cst<'static>>, Cst<'static>);
+#[derive(Default, Debug)] pub struct InputLayer(Option<Ast>, Ast);
 
 impl InputLayers {
-    pub fn new (layer: Cst<'static>) -> Self {
+    pub fn new (layer: Ast) -> Self {
         Self(vec![]).layer(layer)
     }
-    pub fn layer (mut self, layer: Cst<'static>) -> Self {
+    pub fn layer (mut self, layer: Ast) -> Self {
         self.add_layer(layer); self
     }
-    pub fn layer_if (mut self, condition: Cst<'static>, layer: Cst<'static>) -> Self {
+    pub fn layer_if (mut self, condition: Ast, layer: Ast) -> Self {
         self.add_layer_if(Some(condition), layer); self
     }
-    pub fn add_layer (&mut self, layer: Cst<'static>) -> &mut Self {
+    pub fn add_layer (&mut self, layer: Ast) -> &mut Self {
         self.add_layer_if(None, layer.into()); self
     }
-    pub fn add_layer_if (&mut self, condition: Option<Cst<'static>>, binding: Cst<'static>) -> &mut Self {
-        self.0.push(InputLayer { condition, binding, __: Default::default() });
+    pub fn add_layer_if (&mut self, condition: Option<Ast>, binding: Ast) -> &mut Self {
+        self.0.push(InputLayer(condition, binding));
         self
     }
-    pub fn handle <S: Eval<dyn Ast, bool>, I, O: Command<S>> (
-        &self, state: &mut S, input: I
-    ) -> Perhaps<O> {
+    pub fn handle <S, I, O: Command<S>> (&self, state: &mut S, input: I) -> Perhaps<O> {
         InputHandle(state, self.0.as_slice()).try_eval(input)
     }
 }
 
 pub struct InputHandle<'a, S>(&'a mut S, &'a [InputLayer]);
 
-impl<'a, S: Eval<&'a dyn Ast, bool>, I, O: Command<S>> Eval<I, O> for InputHandle<'a, S> {
+impl<'a, S, I, O: Command<S>> Eval<I, O> for InputHandle<'a, S> {
     fn try_eval (&self, input: I) -> Perhaps<O> {
         let Self(state, layers) = self;
         for InputLayer(condition, binding) in layers.iter() {

output/src/ops_dsl.rs

@@ -1,7 +1,7 @@
 use crate::*;
 
 impl<S, A> Dsl<S> for When<A> where S: Eval<Ast, bool> + Eval<Ast, A> {
-    fn try_provide (state: S, source: impl Ast) -> Perhaps<Self> {
+    fn try_provide (state: S, source: Ast) -> Perhaps<Self> {
         if let Ast::Exp(exp) = source {
             let mut iter = source.clone();
             if let Some(Ast::Key(id)) = iter.next() && *id == *"when" {
@@ -16,7 +16,7 @@ impl<S, A> Dsl<S> for When<A> where S: Eval<Ast, bool> + Eval<Ast, A> {
 }
 
 impl<S, A, B> Dsl<S> for Either<A, B> where S: Eval<Ast, bool> + Eval<Ast, A> + Eval<Ast, B> {
-    fn try_provide (state: S, source: impl Ast) -> Perhaps<Self> {
+    fn try_provide (state: S, source: Ast) -> Perhaps<Self> {
         if let Ast::Exp(source) = source {
             let mut iter = source.clone();
             if let Some(Ast::Key(id)) = iter.next() && *id == *"either" {
@@ -32,7 +32,7 @@ impl<S, A, B> Dsl<S> for Either<A, B> where S: Eval<Ast, bool> + Eval<Ast, A> +
 }
 
 impl<S, A, B> Dsl<S> for Bsp<A, B> where S: Eval<Option<Ast>, A> + Eval<Option<Ast>, B> {
-    fn try_provide (state: S, source: impl Ast) -> Perhaps<Self> {
+    fn try_provide (state: S, source: Ast) -> Perhaps<Self> {
         Ok(Some(if let Ast::Exp(source) = source {
             let mut iter = source.clone();
             match iter.next() {
@@ -69,7 +69,7 @@ impl<S, A, B> Dsl<S> for Bsp<A, B> where S: Eval<Option<Ast>, A> + Eval<Option<A
 }
 
 impl<S, A> Dsl<S> for Align<A> where S: Eval<Option<Ast>, A> {
-    fn try_provide (state: S, source: impl Ast) -> Perhaps<Self> {
+    fn try_provide (state: S, source: Ast) -> Perhaps<Self> {
         Ok(Some(if let Ast::Exp(source) = source {
             let mut iter = source.clone();
             match iter.next() {