From 96dd0ebd2618df6ed0c1acf795e9a7054592b566 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Sun, 5 Apr 2015 02:28:52 +0200
Subject: Add support for simple reduce actions

---
 src/lex.cpp | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 82 insertions(+), 2 deletions(-)

(limited to 'src/lex.cpp')

diff --git a/src/lex.cpp b/src/lex.cpp
index 7a3fb6a..70362a7 100644
--- a/src/lex.cpp
+++ b/src/lex.cpp
@@ -243,6 +243,85 @@ int lex_t::lex_keyword(parser_value_t *value) {
 	return ret->token;
 }
 
+int lex_t::unterminated_block(parser_value_t *value) {
+	if (ferror(file))
+		return io_error(value);
+
+	value->error = "unterminated code block";
+	return -1;
+}
+
+int lex_t::lex_block(parser_value_t *value) {
+	size_t parens = 0;
+	bool line_comment = false;
+	bool block_comment = false;
+	bool str = false;
+
+	size_t pos = 0;
+	size_t len = 1024;
+	char *buf = static_cast<char*>(std::malloc(len));
+
+	char prev = 0;
+
+	while (true) {
+		if (!next(true)) {
+			std::free(buf);
+			return unterminated_block(value);
+		}
+
+		char cur = current();
+
+		if (line_comment) {
+			if (cur == '\n' || cur == '\r')
+				line_comment = false;
+		}
+		else if (block_comment) {
+			if (prev == '*' && cur == '/')
+				block_comment = false;
+		}
+		else if (str) {
+			if (prev != '\\' && cur == '"')
+				str = false;
+		}
+		else {
+			if (cur == '{') {
+				parens++;
+			}
+			else if (cur == '}') {
+				if (!parens)
+					break;
+
+				parens--;
+			}
+			else if (cur == '"') {
+				str = true;
+			}
+			else if (prev == '/' && cur == '/') {
+				line_comment = true;
+			}
+			else if (prev == '/' && cur == '*') {
+				block_comment = true;
+			}
+		}
+
+		if (pos >= len) {
+			len *= 2;
+			buf = static_cast<char*>(std::realloc(buf, len));
+		}
+
+		buf[pos++] = cur;
+		prev = cur;
+	}
+
+	value->str = strndup(buf, pos);
+	std::free(buf);
+
+	next(true);
+	consume(true);
+
+	return TOK_BLOCK;
+}
+
 int lex_t::lex_symbol(parser_value_t *value, bool terminal) {
 	if (needspace)
 		return syntax_error(value);
@@ -293,8 +372,6 @@ int lex_t::lex(parser_value_t *value) {
 
 		case ';':
 		case ':':
-		case '{':
-		case '}':
 		case '|':
 		case '=':
 			token = current();
@@ -341,6 +418,9 @@ int lex_t::lex(parser_value_t *value) {
 
 			return TOK_CHAR;
 
+		case '{':
+			return lex_block(value);
+
 			//case '"':
 			//return lex_string(value);
 
-- 
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