Some initial work

1 files changed, 114 insertions, 0 deletions

diff --git a/parser.cpp b/parser.cpp
new file mode 100644
index 0000000..637f945
--- /dev/null
+++ b/parser.cpp
@@ -0,0 +1,114 @@
+/*
+  Copyright (c) 2015, Matthias Schiffer <mschiffer@universe-factory.net>
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice,
+       this list of conditions and the following disclaimer in the documentation
+       and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#include "parser.hpp"
+
+#include <cstdio>
+#include <cstdlib>
+
+
+namespace solar {
+
+enum parser_state {
+	STATE_INIT,
+	STATE_RULE_BAR,
+	STATE_RULE_EQUAL,
+	STATE_RULE,
+};
+
+struct parser {
+	parser_state state;
+};
+
+parser_t * parser_alloc(void) {
+	parser_t *parser = (parser_t *)std::malloc(sizeof(parser_t));
+	parser->state = STATE_INIT;
+
+	return parser;
+}
+
+int parser_parse(parser_t *parser, int token, const value_t *value, state_t *state) {
+	switch (parser->state) {
+	case STATE_INIT:
+		switch (token) {
+		case TOK_NONTERM:
+			parser->state = STATE_RULE_BAR;
+			state->openRule(value->str);
+			return 1;
+
+		case 0:
+			return 0;
+		}
+
+		break;
+
+	case STATE_RULE_BAR:
+			parser->state = STATE_RULE_EQUAL;
+		if (token == '|')
+			return 1;
+
+		break;
+
+	case STATE_RULE_EQUAL:
+		if (token == '=') {
+			parser->state = STATE_RULE;
+			return 1;
+		}
+
+		break;
+
+	case STATE_RULE:
+		switch (token) {
+		case TOK_NONTERM:
+			state->addRuleNonterminal(value->str);
+			return 1;
+
+		case TOK_TERM:
+			state->addRuleTerminal(value->str);
+			return 1;
+
+		case TOK_CHAR:
+			state->addRuleTerminal(value->number);
+			return 1;
+
+		case TOK_BLOCK:
+		case ';':
+			state->closeRule();
+			parser->state = STATE_INIT;
+			return 1;
+		}
+
+		break;
+	}
+
+	return -1;
+}
+
+void parser_free(parser_t *parser) {
+	std::free(parser);
+}
+
+}