From 59e358c5edd79d7dcafcef95a978fb36959d1da6 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sat, 7 Mar 2009 03:25:15 +0000
Subject: Block comments. Wrap up cursor moving logic into a separate function
 so it's less crufty.

git-svn-id: http://svn.drobilla.net/resp/tuplr@71 ad02d1e2-f140-0410-9f75-f8b11f17cedd
---
 tuplr.cpp | 33 +++++++++++++++++++++++----------
 1 file changed, 23 insertions(+), 10 deletions(-)

(limited to 'tuplr.cpp')

diff --git a/tuplr.cpp b/tuplr.cpp
index c726cc6..49a3607 100644
--- a/tuplr.cpp
+++ b/tuplr.cpp
@@ -36,30 +36,38 @@ std::ostream& out = std::cout;
  * S-Expression Lexer :: text -> S-Expressions (SExp)                      *
  ***************************************************************************/
 
+inline int
+readChar(Cursor& cur, istream& in)
+{
+	int ch = in.get();
+	switch (ch) {
+	case '\n': ++cur.line; cur.col = 0; break;
+	default:   ++cur.col;
+	}
+	return ch;
+}
+
 SExp
-readExpression(Cursor& cur, std::istream& in)
+readExpression(Cursor& cur, istream& in)
 {
 #define PUSH(s, t)  { if (t != "") { s.top().list.push_back(SExp(loc, t)); t = ""; } }
 #define YIELD(s, t) { if (s.empty()) { return SExp(loc, t); } else PUSH(s, t) }
 	stack<SExp> stk;
 	string      tok;
 	Cursor      loc; // start of tok
-	while (char ch = in.get()) {
-		++cur.col;
-		switch (ch) {
+	while (int c = readChar(cur, in)) {
+		switch (c) {
 		case EOF:
 			if (!stk.empty()) throw Error("unexpected end of file", cur);
 			return SExp(cur);
 		case ';':
-			while ((ch = in.get()) != '\n') {}
-		case '\n':
-			++cur.line; cur.col = 0;
-		case ' ': case '\t':
+			while ((c = readChar(cur, in)) != '\n') {}
+		case '\n': case ' ': case '\t':
 			if (tok != "") YIELD(stk, tok);
 			break;
 		case '"':
 			loc = cur;
-			do { tok.push_back(ch); ++cur.col; } while ((ch = in.get()) != '"');
+			do { tok.push_back(c); } while ((c = readChar(cur, in)) != '"');
 			YIELD(stk, tok + '"');
 			break;
 		case '(':
@@ -79,9 +87,14 @@ readExpression(Cursor& cur, std::istream& in)
 				stk.top().list.push_back(l);
 			}
 			break;
+		case '#':
+			if (in.peek() == '|') {
+				while (!(readChar(cur, in) == '|' && readChar(cur, in) == '#')) {}
+				break;
+			}
 		default:
 			if (tok == "") loc = cur;
-			tok += ch;
+			tok += c;
 		}
 	}
 	switch (stk.size()) {
-- 
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