Merge #1380

1380: [#1083] Try block syntax r=matklad a=andreytkachenko

The `try` block syntax 

Co-authored-by: Andrey Tkachenko <[email protected]>

5 files changed, 83 insertions, 0 deletions

diff --git a/crates/ra_syntax/src/ast/generated.rs b/crates/ra_syntax/src/ast/generated.rs
index e73fe22e9..1d888e709 100644
--- a/crates/ra_syntax/src/ast/generated.rs
+++ b/crates/ra_syntax/src/ast/generated.rs
@@ -713,6 +713,7 @@ pub enum ExprKind<'a> {
     MethodCallExpr(&'a MethodCallExpr),
     FieldExpr(&'a FieldExpr),
     TryExpr(&'a TryExpr),
+    TryBlockExpr(&'a TryBlockExpr),
     CastExpr(&'a CastExpr),
     RefExpr(&'a RefExpr),
     PrefixExpr(&'a PrefixExpr),
@@ -826,6 +827,11 @@ impl<'a> From<&'a TryExpr> for &'a Expr {
         Expr::cast(&n.syntax).unwrap()
     }
 }
+impl<'a> From<&'a TryBlockExpr> for &'a Expr {
+    fn from(n: &'a TryBlockExpr) -> &'a Expr {
+        Expr::cast(&n.syntax).unwrap()
+    }
+}
 impl<'a> From<&'a CastExpr> for &'a Expr {
     fn from(n: &'a CastExpr) -> &'a Expr {
         Expr::cast(&n.syntax).unwrap()
@@ -887,6 +893,7 @@ impl AstNode for Expr {
             | METHOD_CALL_EXPR
             | FIELD_EXPR
             | TRY_EXPR
+            | TRY_BLOCK_EXPR
             | CAST_EXPR
             | REF_EXPR
             | PREFIX_EXPR
@@ -929,6 +936,7 @@ impl Expr {
             METHOD_CALL_EXPR => ExprKind::MethodCallExpr(MethodCallExpr::cast(&self.syntax).unwrap()),
             FIELD_EXPR => ExprKind::FieldExpr(FieldExpr::cast(&self.syntax).unwrap()),
             TRY_EXPR => ExprKind::TryExpr(TryExpr::cast(&self.syntax).unwrap()),
+            TRY_BLOCK_EXPR => ExprKind::TryBlockExpr(TryBlockExpr::cast(&self.syntax).unwrap()),
             CAST_EXPR => ExprKind::CastExpr(CastExpr::cast(&self.syntax).unwrap()),
             REF_EXPR => ExprKind::RefExpr(RefExpr::cast(&self.syntax).unwrap()),
             PREFIX_EXPR => ExprKind::PrefixExpr(PrefixExpr::cast(&self.syntax).unwrap()),
@@ -3672,6 +3680,35 @@ impl TraitDef {
     }
 }
 
+// TryBlockExpr
+#[derive(Debug, PartialEq, Eq, Hash)]
+#[repr(transparent)]
+pub struct TryBlockExpr {
+    pub(crate) syntax: SyntaxNode,
+}
+unsafe impl TransparentNewType for TryBlockExpr {
+    type Repr = rowan::SyntaxNode;
+}
+
+impl AstNode for TryBlockExpr {
+    fn cast(syntax: &SyntaxNode) -> Option<&Self> {
+        match syntax.kind() {
+            TRY_BLOCK_EXPR => Some(TryBlockExpr::from_repr(syntax.into_repr())),
+            _ => None,
+        }
+    }
+    fn syntax(&self) -> &SyntaxNode { &self.syntax }
+}
+
+impl ToOwned for TryBlockExpr {
+    type Owned = TreeArc<TryBlockExpr>;
+    fn to_owned(&self) -> TreeArc<TryBlockExpr> { TreeArc::cast(self.syntax.to_owned()) }
+}
+
+
+impl ast::TryBlockBodyOwner for TryBlockExpr {}
+impl TryBlockExpr {}
+
 // TryExpr
 #[derive(Debug, PartialEq, Eq, Hash)]
 #[repr(transparent)]
diff --git a/crates/ra_syntax/src/ast/traits.rs b/crates/ra_syntax/src/ast/traits.rs
index 1c90cf148..433485400 100644
--- a/crates/ra_syntax/src/ast/traits.rs
+++ b/crates/ra_syntax/src/ast/traits.rs
@@ -33,6 +33,12 @@ pub trait LoopBodyOwner: AstNode {
     }
 }
 
+pub trait TryBlockBodyOwner: AstNode {
+    fn try_body(&self) -> Option<&ast::Block> {
+        child_opt(self)
+    }
+}
+
 pub trait ArgListOwner: AstNode {
     fn arg_list(&self) -> Option<&ast::ArgList> {
         child_opt(self)
diff --git a/crates/ra_syntax/src/grammar.ron b/crates/ra_syntax/src/grammar.ron
index b8665bbc8..1c2714307 100644
--- a/crates/ra_syntax/src/grammar.ron
+++ b/crates/ra_syntax/src/grammar.ron
@@ -95,6 +95,7 @@ Grammar(
         "let",
         "move",
         "return",
+        "try",
     ],
     contextual_keywords: [
         "auto",
@@ -189,6 +190,7 @@ Grammar(
         "STRUCT_LIT",
         "NAMED_FIELD_LIST",
         "NAMED_FIELD",
+        "TRY_BLOCK_EXPR",
 
         // postfix
         "CALL_EXPR",
@@ -417,6 +419,9 @@ Grammar(
         "LoopExpr": (
             traits: ["LoopBodyOwner"],
         ),
+        "TryBlockExpr": (
+            traits: ["TryBlockBodyOwner"],
+        ),
         "ForExpr": (
             traits: ["LoopBodyOwner"],
             options: [
@@ -499,6 +504,7 @@ Grammar(
                 "MethodCallExpr",
                 "FieldExpr",
                 "TryExpr",
+                "TryBlockExpr",
                 "CastExpr",
                 "RefExpr",
                 "PrefixExpr",
diff --git a/crates/ra_syntax/tests/data/parser/inline/ok/0130_try_block_expr.rs b/crates/ra_syntax/tests/data/parser/inline/ok/0130_try_block_expr.rs
new file mode 100644
index 000000000..0f1b41eb6
--- /dev/null
+++ b/crates/ra_syntax/tests/data/parser/inline/ok/0130_try_block_expr.rs
@@ -0,0 +1,3 @@
+fn foo() {
+    let _ = try {};
+}
diff --git a/crates/ra_syntax/tests/data/parser/inline/ok/0130_try_block_expr.txt b/crates/ra_syntax/tests/data/parser/inline/ok/0130_try_block_expr.txt
new file mode 100644
index 000000000..53f49b9b5
--- /dev/null
+++ b/crates/ra_syntax/tests/data/parser/inline/ok/0130_try_block_expr.txt
@@ -0,0 +1,31 @@
+SOURCE_FILE@[0; 33)
+  FN_DEF@[0; 32)
+    FN_KW@[0; 2) "fn"
+    WHITESPACE@[2; 3) " "
+    NAME@[3; 6)
+      IDENT@[3; 6) "foo"
+    PARAM_LIST@[6; 8)
+      L_PAREN@[6; 7) "("
+      R_PAREN@[7; 8) ")"
+    WHITESPACE@[8; 9) " "
+    BLOCK@[9; 32)
+      L_CURLY@[9; 10) "{"
+      WHITESPACE@[10; 15) "\n    "
+      LET_STMT@[15; 30)
+        LET_KW@[15; 18) "let"
+        WHITESPACE@[18; 19) " "
+        PLACEHOLDER_PAT@[19; 20)
+          UNDERSCORE@[19; 20) "_"
+        WHITESPACE@[20; 21) " "
+        EQ@[21; 22) "="
+        WHITESPACE@[22; 23) " "
+        TRY_EXPR@[23; 29)
+          TRY_KW@[23; 26) "try"
+          WHITESPACE@[26; 27) " "
+          BLOCK@[27; 29)
+            L_CURLY@[27; 28) "{"
+            R_CURLY@[28; 29) "}"
+        SEMI@[29; 30) ";"
+      WHITESPACE@[30; 31) "\n"
+      R_CURLY@[31; 32) "}"
+  WHITESPACE@[32; 33) "\n"