From b62968379af690f22980c272182c768cdf20bf9a Mon Sep 17 00:00:00 2001
From: greg <greg.shuflin@protonmail.com>
Date: Sun, 28 Jul 2019 11:10:20 -0700
Subject: [PATCH] Replace matches with functional constructs

---
 schala-lang/language/src/schala.rs | 20 +++++++-------------
 1 file changed, 7 insertions(+), 13 deletions(-)

diff --git a/schala-lang/language/src/schala.rs b/schala-lang/language/src/schala.rs
index fd733c7..b0260a1 100644
--- a/schala-lang/language/src/schala.rs
+++ b/schala-lang/language/src/schala.rs
@@ -96,11 +96,7 @@ fn tokenizing(input: &str, _handle: &mut Schala, comp: Option<&mut PassDebugArti
 fn parsing(input: Vec<tokenizing::Token>, handle: &mut Schala, comp: Option<&mut PassDebugArtifact>) -> Result<ast::AST, String> {
   use crate::parsing::Parser;
 
-  let mut parser = match handle.active_parser.take() {
-    None => Parser::new(input),
-    Some(parser) => parser
-  };
-
+  let mut parser = handle.active_parser.take().unwrap_or_else(|| Parser::new(input));
   let ast = parser.parse();
   let trace = parser.format_parse_trace();
 
@@ -133,15 +129,13 @@ fn format_parse_error(error: parsing::ParseError, handle: &mut Schala) -> String
 }
 
 fn symbol_table(input: ast::AST, handle: &mut Schala, comp: Option<&mut PassDebugArtifact>) -> Result<ast::AST, String> {
-  let add = handle.symbol_table.borrow_mut().add_top_level_symbols(&input);
-  match add {
-    Ok(()) => {
+  handle.symbol_table.borrow_mut().add_top_level_symbols(&input).map(|()| {
+    comp.map(|comp| {
       let debug = handle.symbol_table.borrow().debug_symbol_table();
-      comp.map(|comp| comp.add_artifact(debug));
-      Ok(input)
-    },
-    Err(msg) => Err(msg)
-  }
+      comp.add_artifact(debug);
+    });
+    input
+  })
 }
 
 fn typechecking(input: ast::AST, handle: &mut Schala, comp: Option<&mut PassDebugArtifact>) -> Result<ast::AST, String> {