From 7164809b051050fb4f4877793b9739b6177bcab1 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sat, 4 Jul 2009 05:02:09 +0000
Subject: Ditch Exp type and use AST even at lex time.

git-svn-id: http://svn.drobilla.net/resp/tuplr@182 ad02d1e2-f140-0410-9f75-f8b11f17cedd
---
 src/lex.cpp | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

(limited to 'src/lex.cpp')

diff --git a/src/lex.cpp b/src/lex.cpp
index bfdd9c1..b5c89e9 100644
--- a/src/lex.cpp
+++ b/src/lex.cpp
@@ -16,7 +16,7 @@
  */
 
 /** @file
- * @brief Lexing (build a SExp from a string)
+ * @brief Lexing (build an unparsed textual AST from a string)
  */
 
 #include <stack>
@@ -36,19 +36,19 @@ readChar(Cursor& cur, istream& in)
 }
 
 /// Read an expression from @a in
-SExp
+AST*
 readExpression(Cursor& cur, istream& in)
 {
-#define PUSH(s, t)  { if (t != "") { s.top().push_back(SExp(loc, new AString(loc, t))); t = ""; } }
-#define YIELD(s, t) { if (s.empty()) { return SExp(loc, new AString(loc, t)); } else PUSH(s, t) }
-	stack<SExp> stk;
-	string      tok;
-	Cursor      loc; // start of tok
+#define PUSH(s, t)  { if (t != "") { s.top()->push_back(new AString(loc, t)); t = ""; } }
+#define YIELD(s, t) { if (s.empty()) { return new AString(loc, t); } else PUSH(s, t) }
+	stack<ATuple*> stk;
+	string         tok;
+	Cursor         loc; // start of tok
 	while (int c = readChar(cur, in)) {
 		switch (c) {
 		case EOF:
 			THROW_IF(!stk.empty(), cur, "unexpected end of file")
-			return SExp(cur);
+			return new ATuple(cur);
 		case ';':
 			while ((c = readChar(cur, in)) != '\n') {}
 		case '\n': case ' ': case '\t':
@@ -60,7 +60,7 @@ readExpression(Cursor& cur, istream& in)
 			YIELD(stk, tok + '"');
 			break;
 		case '(':
-			stk.push(SExp(cur));
+			stk.push(new ATuple(cur));
 			break;
 		case ')':
 			switch (stk.size()) {
@@ -71,9 +71,9 @@ readExpression(Cursor& cur, istream& in)
 				return stk.top();
 			default:
 				PUSH(stk, tok);
-				SExp l = stk.top();
+				ATuple* l = stk.top();
 				stk.pop();
-				stk.top().push_back(l);
+				stk.top()->push_back(l);
 			}
 			break;
 		case '#':
@@ -87,9 +87,9 @@ readExpression(Cursor& cur, istream& in)
 		}
 	}
 	switch (stk.size()) {
-	case 0:  return SExp(loc, new AString(loc, tok));
+	case 0:  return new AString(loc, tok);
 	case 1:  return stk.top();
 	default: throw  Error(cur, "missing `)'");
 	}
-	return SExp(cur);
+	return new ATuple(cur);
 }
-- 
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