From c89abd42621daff2d652566be4e9e4789599268c Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Mon, 2 Sep 2019 18:51:03 +0300
Subject: simplify

---
 crates/ra_parser/src/grammar.rs |  7 +---
 crates/ra_parser/src/lib.rs     | 84 ++++++++++++++++-------------------------
 2 files changed, 35 insertions(+), 56 deletions(-)

(limited to 'crates/ra_parser')

diff --git a/crates/ra_parser/src/grammar.rs b/crates/ra_parser/src/grammar.rs
index 2bcbb4184..d0f0dd4ac 100644
--- a/crates/ra_parser/src/grammar.rs
+++ b/crates/ra_parser/src/grammar.rs
@@ -61,11 +61,8 @@ pub(crate) mod fragments {
         let _ = expressions::expr(p);
     }
 
-    pub(crate) fn stmt(p: &mut Parser, with_semi: bool) {
-        let with_semi =
-            if with_semi { expressions::StmtWithSemi::Yes } else { expressions::StmtWithSemi::No };
-
-        expressions::stmt(p, with_semi)
+    pub(crate) fn stmt(p: &mut Parser) {
+        expressions::stmt(p, expressions::StmtWithSemi::No)
     }
 
     pub(crate) fn opt_visibility(p: &mut Parser) {
diff --git a/crates/ra_parser/src/lib.rs b/crates/ra_parser/src/lib.rs
index e494fc480..45241e566 100644
--- a/crates/ra_parser/src/lib.rs
+++ b/crates/ra_parser/src/lib.rs
@@ -83,60 +83,42 @@ pub fn parse(token_source: &mut dyn TokenSource, tree_sink: &mut dyn TreeSink) {
     parse_from_tokens(token_source, tree_sink, grammar::root);
 }
 
-/// Parse given tokens into the given sink as a path
-pub fn parse_path(token_source: &mut dyn TokenSource, tree_sink: &mut dyn TreeSink) {
-    parse_from_tokens(token_source, tree_sink, grammar::fragments::path);
-}
-
-/// Parse given tokens into the given sink as a expression
-pub fn parse_expr(token_source: &mut dyn TokenSource, tree_sink: &mut dyn TreeSink) {
-    parse_from_tokens(token_source, tree_sink, grammar::fragments::expr);
-}
-
-/// Parse given tokens into the given sink as a ty
-pub fn parse_ty(token_source: &mut dyn TokenSource, tree_sink: &mut dyn TreeSink) {
-    parse_from_tokens(token_source, tree_sink, grammar::fragments::type_);
-}
-
-/// Parse given tokens into the given sink as a pattern
-pub fn parse_pat(token_source: &mut dyn TokenSource, tree_sink: &mut dyn TreeSink) {
-    parse_from_tokens(token_source, tree_sink, grammar::fragments::pattern);
-}
-
-/// Parse given tokens into the given sink as a statement
-pub fn parse_stmt(
+pub enum FragmentKind {
+    Path,
+    Expr,
+    Statement,
+    Type,
+    Pattern,
+    Item,
+    Block,
+    Visibility,
+    MetaItem,
+
+    // These kinds are used when parsing the result of expansion
+    // FIXME: use separate fragment kinds for macro inputs and outputs?
+    Items,
+    Statements,
+}
+
+pub fn parse_fragment(
     token_source: &mut dyn TokenSource,
     tree_sink: &mut dyn TreeSink,
-    with_semi: bool,
+    fragment_kind: FragmentKind,
 ) {
-    parse_from_tokens(token_source, tree_sink, |p| grammar::fragments::stmt(p, with_semi));
-}
-
-/// Parse given tokens into the given sink as a block
-pub fn parse_block(token_source: &mut dyn TokenSource, tree_sink: &mut dyn TreeSink) {
-    parse_from_tokens(token_source, tree_sink, grammar::fragments::block);
-}
-
-pub fn parse_meta(token_source: &mut dyn TokenSource, tree_sink: &mut dyn TreeSink) {
-    parse_from_tokens(token_source, tree_sink, grammar::fragments::meta_item);
-}
-
-/// Parse given tokens into the given sink as an item
-pub fn parse_item(token_source: &mut dyn TokenSource, tree_sink: &mut dyn TreeSink) {
-    parse_from_tokens(token_source, tree_sink, grammar::fragments::item);
-}
-
-/// Parse given tokens into the given sink as an visibility qualifier
-pub fn parse_vis(token_source: &mut dyn TokenSource, tree_sink: &mut dyn TreeSink) {
-    parse_from_tokens(token_source, tree_sink, grammar::fragments::opt_visibility);
-}
-
-pub fn parse_macro_items(token_source: &mut dyn TokenSource, tree_sink: &mut dyn TreeSink) {
-    parse_from_tokens(token_source, tree_sink, grammar::fragments::macro_items);
-}
-
-pub fn parse_macro_stmts(token_source: &mut dyn TokenSource, tree_sink: &mut dyn TreeSink) {
-    parse_from_tokens(token_source, tree_sink, grammar::fragments::macro_stmts);
+    let parser: fn(&'_ mut parser::Parser) = match fragment_kind {
+        FragmentKind::Path => grammar::fragments::path,
+        FragmentKind::Expr => grammar::fragments::expr,
+        FragmentKind::Type => grammar::fragments::type_,
+        FragmentKind::Pattern => grammar::fragments::pattern,
+        FragmentKind::Item => grammar::fragments::item,
+        FragmentKind::Block => grammar::fragments::block,
+        FragmentKind::Visibility => grammar::fragments::opt_visibility,
+        FragmentKind::MetaItem => grammar::fragments::meta_item,
+        FragmentKind::Statement => grammar::fragments::stmt,
+        FragmentKind::Items => grammar::fragments::macro_items,
+        FragmentKind::Statements => grammar::fragments::macro_stmts,
+    };
+    parse_from_tokens(token_source, tree_sink, parser)
 }
 
 /// A parsing function for a specific braced-block.
-- 
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