X-Git-Url: http://git.localhorst.tv/?a=blobdiff_plain;f=src%2Floader%2FTokenizer.cpp;h=6acda5fce7ed93dc3df250fd95987b5559211c1f;hb=51e0a94d0e0a3bc1a4664aa9af1f20910f55201c;hp=828f6ed131afe44118e8b86aead5b2c2235284ea;hpb=d1bfdd8fcb19f27d63400109810de168d0a8ab1a;p=l2e.git

diff --git a/src/loader/Tokenizer.cpp b/src/loader/Tokenizer.cpp
index 828f6ed..6acda5f 100644
--- a/src/loader/Tokenizer.cpp
+++ b/src/loader/Tokenizer.cpp
@@ -12,19 +12,56 @@
 namespace loader {
 
 bool Tokenizer::HasMore() {
-	return in;
+	if (isPutback) return true;
+	ScanSpace();
+	if (!in) return false;
+
+	putback = ReadToken();
+	isPutback = true;
+	if (!skipComments || putback.type != Token::COMMENT) return true;
+
+	while (in && putback.type == Token::COMMENT) {
+		putback = ReadToken();
+		ScanSpace();
+	}
+	return putback.type != Token::COMMENT;
+}
+
+void Tokenizer::ScanSpace() {
+	std::istream::char_type c;
+	in.get(c);
+	while (in && std::isspace(c)) {
+		if (c == '\n') {
+			++line;
+		}
+		in.get(c);
+	}
+	if (in) {
+		in.putback(c);
+	}
 }
 
 void Tokenizer::Putback(const Token &t) {
 	if (isPutback) {
-		throw LexerError("Tokenizer: double putback not supported");
+		throw LexerError(line, "Tokenizer: double putback not supported");
 	} else {
 		putback = t;
 		isPutback = true;
 	}
 }
 
+const Tokenizer::Token &Tokenizer::Peek() {
+	if (!isPutback) {
+		putback = GetNext();
+		isPutback = true;
+	}
+	return putback;
+}
+
 Tokenizer::Token Tokenizer::GetNext() {
+	if (!HasMore()) {
+		throw LexerError(line, "read beyond last token");
+	}
 	if (isPutback) {
 		isPutback = false;
 		return putback;
@@ -34,9 +71,9 @@ Tokenizer::Token Tokenizer::GetNext() {
 }
 
 Tokenizer::Token Tokenizer::ReadToken() {
+	ScanSpace();
 	std::istream::char_type c;
 	in.get(c);
-	while (std::isspace(c)) in.get(c);
 	switch (c) {
 		case Token::ANGLE_BRACKET_OPEN:
 		case Token::ANGLE_BRACKET_CLOSE:
@@ -57,6 +94,19 @@ Tokenizer::Token Tokenizer::ReadToken() {
 		case '"':
 			in.putback(c);
 			return ReadString();
+		case '/':
+			{
+				std::istream::char_type c2;
+				in.get(c2);
+				if (c2 == '/') {
+					return ReadComment();
+				} else if (c2 == '*') {
+					return ReadMultilineComment();
+				} else {
+					throw LexerError(line, std::string("Tokenizer: cannot parse token: ") + c + c2 + ": expected / or *");
+				}
+			}
+			break;
 		default:
 			in.putback(c);
 			{
@@ -66,7 +116,7 @@ Tokenizer::Token Tokenizer::ReadToken() {
 				} else if (std::islower(c)) {
 					CheckKeyword(t);
 				} else {
-					throw LexerError(std::string("Tokenizer: cannot parse token: ") + c);
+					throw LexerError(line, std::string("Tokenizer: cannot parse token: ") + c);
 				}
 				return t;
 			}
@@ -106,7 +156,7 @@ Tokenizer::Token Tokenizer::ReadString() {
 	std::istream::char_type c;
 	in.get(c);
 	if (c != '"') {
-		throw LexerError("Tokenizer: strings must begin with '\"'");
+		throw LexerError(line, "Tokenizer: strings must begin with '\"'");
 	}
 
 	while (in.get(c)) {
@@ -154,6 +204,28 @@ Tokenizer::Token Tokenizer::ReadIdentifier() {
 	return t;
 }
 
+Tokenizer::Token Tokenizer::ReadComment() {
+	std::istream::char_type c;
+	while (in.get(c) && c != '\n');
+	++line;
+	return Token(Token::COMMENT);
+}
+
+Tokenizer::Token Tokenizer::ReadMultilineComment() {
+	std::istream::char_type c;
+	while (in.get(c)) {
+		if (c == '*') {
+			std::istream::char_type c2;
+			if (in.get(c2) && c2 == '/') {
+				break;
+			}
+		} else if (c == '\n') {
+			++line;
+		}
+	}
+	return Token(Token::COMMENT);
+}
+
 bool Tokenizer::CheckKeyword(Token &t) {
 	if (t.str == "export") {
 		t.type = Token::KEYWORD_EXPORT;