Merge pull request #64 from mist-go/syntax-patches

Syntax patches

crates/codegen/src/expr.rs

@@ -153,6 +153,14 @@ impl GenRust for Vec<Prefix> {
 impl GenRust for Postfix {
     fn gen_rust(&self, ctx: &mut Context, cg: &mut RustCodegen) {
         match self {
+            Postfix::TupleFieldAccess(field, generics) => cg.add(&format!(
+                ".{}{}",
+                field,
+                generics
+                    .iter()
+                    .map(|v| format!("::{}", v.get_rust()))
+                    .collect::<String>()
+            )),
             Postfix::FieldAccess(field, generics) => cg.add(&format!(
                 ".{}{}",
                 field.get_rust(),
@@ -192,8 +200,10 @@ impl GenRust for Postfix {
 
                 for (name, expr) in fields {
                     cg.add(&name.get_rust());
-                    cg.add(": ");
-                    expr.gen_rust(ctx, cg);
+                    if let Some(expr) = expr {
+                        cg.add(": ");
+                        expr.gen_rust(ctx, cg);
+                    }
                     cg.add(",");
                 }
 

crates/codegen/src/lib.rs

@@ -208,19 +208,14 @@ pub fn get_static_type_path(path: &Path) -> String {
 impl GetRust for TypeExprKind {
     fn get_rust(&self) -> String {
         match self {
-            TypeExprKind::Path(path) => get_static_type_path(path),
-            TypeExprKind::Lifetime(name) => format!("'{}", name.get_rust()),
-            TypeExprKind::PathParams(path, params) => {
-                format!(
-                    "{}<{}>",
-                    get_static_type_path(path),
-                    params
-                        .into_iter()
-                        .map(|t| t.get_rust())
-                        .collect::<Vec<_>>()
-                        .join(", ")
-                )
+            TypeExprKind::Path(path, generics) => {
+                if let Some(generics) = generics {
+                    format!("{}{}", get_static_type_path(path), generics.get_rust())
+                } else {
+                    get_static_type_path(path)
+                }
             }
+            TypeExprKind::Lifetime(name) => format!("'{}", name.get_rust()),
             TypeExprKind::Tuple(types) => format!(
                 "({})",
                 types

crates/codegen/src/statement.rs

@@ -90,12 +90,14 @@ impl GenRust for Statement {
                 else_branch,
             } => {
                 cg.add("if ");
+                ctx.expr_ensure_semicolon = false;
                 initial.condition.gen_rust(ctx, cg);
                 cg.add(" ");
                 cg.ensure_brackets_body(ctx, &initial.body);
 
                 for else_if_branch in else_if {
-                    cg.add("else if");
+                    cg.add(" else if ");
+                    ctx.expr_ensure_semicolon = false;
                     else_if_branch.condition.gen_rust(ctx, cg);
                     cg.add(" ");
                     cg.ensure_brackets_body(ctx, &else_if_branch.body);

crates/codegen/src/top_level.rs

@@ -235,7 +235,7 @@ impl GenRust for (&Vec<Spanned<FieldDeclStmt>>, &Spanned<ClassConstructor>) {
         let mut constructor_params = vec![VarDecl {
             name: Pattern::Path(false, Path(vec![Identifier(String::from("self"))])),
             type_: Some(TypeExpr(
-                TypeExprKind::Path(Path(vec![Identifier(String::from("Self"))])),
+                TypeExprKind::Path(Path(vec![Identifier(String::from("Self"))]), None),
                 vec![TypePostfix::RefMut],
             )),
         }];
@@ -423,8 +423,10 @@ impl GenRust for TopLevelKind {
                             let mut impl_ = impl_.clone();
 
                             impl_.item.trait_ = Some(impl_.item.target);
-                            impl_.item.target =
-                                TypeExpr(TypeExprKind::Path(Path(vec![name.clone()])), Vec::new());
+                            impl_.item.target = TypeExpr(
+                                TypeExprKind::Path(Path(vec![name.clone()]), None),
+                                Vec::new(),
+                            );
 
                             impl_.gen_rust(ctx, cg);
                         }

crates/parser/src/ast/expr.rs

@@ -50,12 +50,13 @@ pub enum MacroDelimiter {
 #[derive(Debug, Clone, Serialize)]
 pub enum Postfix {
     FieldAccess(Identifier, Option<Generics>),
+    TupleFieldAccess(u8, Option<Generics>),
     Call(Vec<Expression>),
     MacroCall {
         inner: String,
         delimiter: MacroDelimiter,
     },
-    StructCall(Vec<(Identifier, Expression)>),
+    StructCall(Vec<(Identifier, Option<Expression>)>),
     Assign(String, Box<Expression>),
     Index(Expression),
     As(TypeExpr),

crates/parser/src/ast/mod.rs

@@ -31,8 +31,7 @@ pub enum TypePostfix {
 
 #[derive(Debug, Clone, Serialize)]
 pub enum TypeExprKind {
-    Path(Path),
-    PathParams(Path, Vec<TypeExpr>),
+    Path(Path, Option<Generics>),
     Tuple(Vec<TypeExpr>),
     Lifetime(Identifier),
 }
@@ -54,9 +53,10 @@ impl From<GenericDecl> for Generic {
     fn from(value: GenericDecl) -> Self {
         match value {
             GenericDecl::Lifetime(life) => Generic::Lifetime(life),
-            GenericDecl::Type(ty, _) => {
-                Generic::Type(TypeExpr(TypeExprKind::Path(Path(vec![ty])), Vec::new()))
-            }
+            GenericDecl::Type(ty, _) => Generic::Type(TypeExpr(
+                TypeExprKind::Path(Path(vec![ty]), None),
+                Vec::new(),
+            )),
         }
     }
 }

crates/parser/src/grammar.pest

@@ -80,10 +80,10 @@ let_kw     = { "let" }
 // ======================================================
 // GENERICS
 // ======================================================
-generic_decl  = { lifetime | (identifier ~ (":" ~ type_expr_param ~ ("+" ~ type_expr_param)*)?) }
+generic_decl  = { lifetime | (identifier ~ (":" ~ generic ~ ("+" ~ generic)*)?) }
 generics_decl = { "<" ~ (generic_decl ~ ("," ~ generic_decl)*)? ~ ">" }
 
-generic  = { lifetime | type_expr_param }
+generic  = { lifetime | type_expr }
 generics = { "<" ~ (generic ~ ("," ~ generic)*)? ~ ">" }
 
 // ======================================================
@@ -95,7 +95,7 @@ tuple_type = {
 }
 
 path_type = {
-    static_path ~ ("<" ~ (type_expr_param ~ ("," ~ type_expr_param)*)? ~ ">")?
+    static_path ~ generics?
 }
 
 ref_type = {
@@ -114,11 +114,6 @@ lifetime = {
     "'" ~ identifier
 }
 
-type_expr_param = {
-    type_expr
-  | lifetime
-}
-
 // ======================================================
 // LITERALS
 // ======================================================
@@ -281,13 +276,13 @@ self_param = {
     "self" ~ mutable? ~ deref_px?
 }
 
-method = {
-    visibility? ~ type_expr ~ identifier ~ generics_decl? ~ "(" ~ self_param? ~ ("," ~ param_list)? ~ ")" ~ block
+method_args = _{
+    ((self_param ~ ("," ~ param_list)?) | param_list) ~ ","?
 }
 
 class_item = _{
     impl_decl
-  | method
+  | function_decl
 }
 
 class_decl = {
@@ -298,25 +293,20 @@ class_decl = {
 // IMPL
 // ======================================================
 impl_for_decl = {
-    "impl" ~ generics_decl? ~ type_expr ~ "for" ~ type_expr ~ "{" ~ method* ~ "}"
+    "impl" ~ generics_decl? ~ type_expr ~ "for" ~ type_expr ~ "{" ~ function_decl* ~ "}"
 }
 
 impl_decl = {
-    "impl" ~ generics_decl? ~ type_expr ~ "{" ~ method* ~ "}"
+    "impl" ~ generics_decl? ~ type_expr ~ "{" ~ function_decl* ~ "}"
 }
 
 // ======================================================
 // Traits
 // ======================================================
-trait_requirements = { ":" ~ type_expr_param ~ ("+" ~ type_expr_param)* }
-
-method_no_body = {
-    visibility? ~ type_expr ~ identifier ~ generics_decl? ~ "(" ~ self_param? ~ ("," ~ param_list)? ~ ")" ~ semicolon
-}
+trait_requirements = { ":" ~ generic ~ ("+" ~ generic)* }
 
 trait_item = _{
-    method
-  | method_no_body
+    function_decl
 }
 
 trait_decl = {
@@ -328,7 +318,7 @@ trait_decl = {
 // ======================================================
 
 function_decl = {
-    visibility? ~ type_expr ~ identifier ~ "(" ~ param_list ~ ")" ~ block
+    visibility? ~ type_expr ~ identifier ~ generics_decl? ~ "(" ~ method_args ~ ")" ~ (block | semicolon)
 }
 
 // ======================================================
@@ -404,7 +394,7 @@ control_flow = {
 
 statement_branch = { "(" ~ expr ~ ")" ~ statement_body }
 
-else_if = {
+else_if = _{
     "else" ~ "if" ~ statement_branch
 }
 
@@ -491,7 +481,7 @@ macro_inner_v = @{
 // ------------------------------------------------------
 
 expr_path_segment = {
-    identifier ~ ("::" ~ generics)?
+    identifier ~ generics?
 }
 
 expr_path = {
@@ -512,7 +502,11 @@ primary = {
 // ------------------------------------------------------
 
 field_px = {
-    "." ~ identifier ~ ("::" ~ generics)?
+    "." ~ identifier ~ generics?
+}
+
+tuple_field_px = {
+    "." ~ integer ~ generics?
 }
 
 call_px = {
@@ -524,7 +518,7 @@ macro_call_bracket = { "!" ~ "[" ~ macro_inner_v* ~ "]" }
 macro_call_brace   = { "!" ~ "{" ~ macro_inner_v* ~ "}" }
 
 struct_field_decl = {
-    identifier ~ ":" ~ expr
+    identifier ~ (":" ~ expr)?
 }
 
 struct_px = {
@@ -553,6 +547,7 @@ decrement = {
 
 postfix = {
     field_px
+  | tuple_field_px
   | call_px
   | macro_call_paren
   | macro_call_bracket

crates/parser/src/parser/common/expr.rs

@@ -141,13 +141,21 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Postfix {
                 ))
             }
 
+            Rule::tuple_field_px => {
+                ast_expr!(Postfix::TupleFieldAccess(
+                    Ok(inner.next().unwrap().as_str().parse().unwrap_or(255_u8))
+                        as AstResult<'_, u8>,
+                    inner.next().map(Generics::try_from).transpose(),
+                ))
+            }
+
             Rule::call_px => ast_expr!(Postfix::Call(collect_recovered(inner))),
 
             Rule::struct_px => ast_expr!(Postfix::StructCall(collect_recovered_map(inner, |p| {
                 let mut pi = p.into_inner();
                 Ok((
                     Identifier::try_from(pi.next().unwrap())?,
-                    Expression::try_from(pi.next().unwrap()).get()?,
+                    pi.next().map(Expression::try_from).transpose().get()?,
                 ))
             }))),
 

crates/parser/src/parser/common/types.rs

@@ -2,7 +2,7 @@ use crate::{
     Rule,
     ast::*,
     ast_ensure, ast_expr,
-    error::{AstError, GetLength, IntoErr, collect_recovered},
+    error::{AstError, IntoErr, collect_recovered},
     parser::{consume_rule, listen_rule},
 };
 
@@ -53,14 +53,10 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for TypeExprKind {
         match rule {
             Rule::tuple_type => ast_expr!(TypeExprKind::Tuple(collect_recovered(inner))),
             Rule::path_type => {
-                let path = Path::try_from(inner.next().unwrap());
-                let params = collect_recovered(inner);
-
-                if params.len() == 0 {
-                    ast_expr!(TypeExprKind::Path(path))
-                } else {
-                    ast_expr!(TypeExprKind::PathParams(path, params))
-                }
+                ast_expr!(TypeExprKind::Path(
+                    Path::try_from(inner.next().unwrap()),
+                    inner.next().map(Generics::try_from).transpose()
+                ))
             }
             _ => AstError::bug_unimplemented(pair),
         }
@@ -75,11 +71,11 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for TypeExpr {
         let mut inner = pair.clone().into_inner();
 
         match rule {
+            Rule::generic => Self::try_from(inner.next().unwrap()),
             Rule::type_expr => ast_expr!(TypeExpr(
                 inner.next().unwrap().try_into(),
                 collect_recovered(inner),
             )),
-            Rule::type_expr_param => Self::try_from(inner.next().unwrap()),
             Rule::lifetime => ast_expr!(TypeExprKind::Lifetime(inner.next().unwrap().try_into()))
                 .get_map(TypeExpr::no_px)
                 .map(TypeExpr::no_px),

crates/parser/src/parser/items/class.rs

@@ -42,7 +42,7 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for ClassItem {
                 Ok(ClassItem::ImplDecl(pair.try_into().get()?))
             }
 
-            Rule::method => Ok(ClassItem::Method(pair.try_into().get()?)),
+            Rule::function_decl => Ok(ClassItem::Method(pair.try_into().get()?)),
 
             _ => AstError::bug_unimplemented(pair),
         }

crates/parser/src/parser/items/function.rs

@@ -10,7 +10,7 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for FunctionDecl {
     type Error = AstError<'a, Self>;
 
     fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
-        ast_ensure!(pair, Rule::function_decl, Rule::method, Rule::method_no_body => {
+        ast_ensure!(pair, Rule::function_decl => {
         let mut inner = pair.into_inner();
             let visibility = Visibility::try_from(&mut inner);
             let return_type = TypeExpr::try_from(inner.next().unwrap());
@@ -30,7 +30,7 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for FunctionDecl {
                 VarDecl {
                     name: name.clone(),
                     type_: Some(TypeExpr(
-                        TypeExprKind::Path(Path(vec![Identifier("Self".to_string())])),
+                        TypeExprKind::Path(Path(vec![Identifier("Self".to_string())]), None),
                         if is_ref {
                             vec![if mutable {
                                 TypePostfix::RefMut