From c3b5e0b68e5eb729f0f8b3e0d9fd6b643627e5e6 Mon Sep 17 00:00:00 2001
From: shariq <bluerriq@gmail.com>
Date: Wed, 20 Sep 2017 23:16:38 +0500
Subject: [PATCH] Initial work on unified textual resource parsing

---
 src/common/parser.c    | 108 ++++++++++++++++++++++++++++++++++++++++-
 src/common/parser.h    |   1 +
 src/libsymmetry/game.c |  12 +++++
 3 files changed, 119 insertions(+), 2 deletions(-)

diff --git a/src/common/parser.c b/src/common/parser.c
index 486c96c..87e7a84 100644
--- a/src/common/parser.c
+++ b/src/common/parser.c
@@ -7,8 +7,14 @@
 
 #define MAX_LINE_LEN 512
 #define MAX_VALUE_LEN 512
-#define QUOTE(str) #str
-#define KEY_LEN_STR(LEN) QUOTE(LEN)
+
+struct Parser_Object
+{
+	int type;
+	char* key;
+	char* value;
+	char* object_data;
+};
 
 bool parser_load(FILE* file, const char* filename, Parser_Assign_Func assign_func, bool return_on_emptyline, int current_line)
 {
@@ -60,3 +66,101 @@ bool parser_load(FILE* file, const char* filename, Parser_Assign_Func assign_fun
 	}
 	return true;
 }
+
+bool parser_load_objects(FILE* file, const char* filename)
+{
+	/* Note, this is isn't really a proper parser and might have lurking bugs, it just has to be
+	   good enough for my needs. For example, multiple opening and closing braces on them
+	   same line are fine but opening brace on the same line as type is NOT fine. There
+	   are probably several others that i don't know of yet. This is just a temporary solution,
+	   i may completely change the format in the future or switch to binary or use something like
+	   JSON or TOML etc. */
+	
+	if(!file)
+	{
+		log_error("parser:load_objects", "Invalid file handle for file %s", filename);
+		return false;
+	}
+
+	int current_line = 0;
+	char line_buffer[MAX_LINE_LEN];
+	char type_str[HASH_MAX_KEY_LEN];
+	char obj_str[1024];
+	
+	while(fgets(line_buffer, MAX_LINE_LEN - 1, file))
+	{
+		current_line++;
+		memset(type_str, '\0', HASH_MAX_KEY_LEN);
+
+		if(strlen(line_buffer) == 0 || isspace(line_buffer[0]) != 0)
+		{
+			continue;
+		}
+		
+		if(line_buffer[0] == '#')
+			continue;
+
+		/* Object type */
+		if(sscanf(line_buffer, "%s", type_str) != 1)
+		{
+			log_warning("Malformed line in config file %s, line %d", filename, current_line);
+			continue;
+		}
+
+		long obj_beginning = -1;
+		long obj_ending    = -1;
+		int  obj_begin_expexted_at = current_line + 1;
+		bool found_next_before_current_ended = false;
+		
+		/* Opening brace and closing brace */
+		while(fgets(line_buffer, MAX_LINE_LEN - 1, file))
+		{
+			current_line++;
+			if(strchr(line_buffer, '{'))
+			{
+				obj_beginning = ftell(file) - strlen(line_buffer);
+				while(fgets(line_buffer, MAX_LINE_LEN - 1, file))
+				{
+					current_line++;
+					/* check if we found opening brace of next object,
+					   if this is true then it means that this object is missing
+					   it's closing brace and we should stop */
+					if(strchr(line_buffer, '{'))
+					{
+						found_next_before_current_ended = true;
+						break;
+					}
+					
+					if(strchr(line_buffer, '}'))
+					{
+						obj_ending = ftell(file);
+						break;
+					}
+				}
+				if(obj_ending) break;
+			}
+		}
+
+		if(obj_beginning == -1)
+		{
+			log_error("parser:load_object", "Syntax error while loading %s, expected '{' at line %d", filename, obj_begin_expexted_at);
+			return false;
+		}
+
+		if(obj_ending == -1)
+		{
+			if(found_next_before_current_ended)
+				log_error("parser:load_object", "Syntax error while loading %s, expected '}' before line %d but found '{'", filename, current_line);
+			else
+				log_error("parser:load_object", "Syntax error while loading %s, expected '}' at line %d", filename, current_line);
+			return false;
+		}
+
+		memset(obj_str, '\0', 1024);
+		fseek(file, obj_beginning, SEEK_SET);
+		fread(obj_str, obj_ending - obj_beginning, 1, file);
+		log_to_stdout("Object found\nType: %s\n%s\n\n", type_str, obj_str);
+	}
+	
+	return true;
+}
diff --git a/src/common/parser.h b/src/common/parser.h
index 5ea0300..42fdb43 100644
--- a/src/common/parser.h
+++ b/src/common/parser.h
@@ -8,5 +8,6 @@ struct Hashmap;
 typedef void (*Parser_Assign_Func)(const char* key, const char* value, const char* filename, int current_line);
 
 bool parser_load(FILE* file, const char* filename, Parser_Assign_Func assign_func, bool return_on_emptyline, int current_line);
+bool parser_load_objects(FILE* file, const char* filename);
 
 #endif
diff --git a/src/libsymmetry/game.c b/src/libsymmetry/game.c
index a355ee8..f0c61a7 100644
--- a/src/libsymmetry/game.c
+++ b/src/libsymmetry/game.c
@@ -24,6 +24,7 @@
 #include "gl_load.h"
 #include "gui.h"
 #include "editor.h"
+#include "../common/parser.h"
 #include "../common/hashmap.h"
 #include "../common/variant.h"
 #include "../common/common.h"
@@ -215,6 +216,17 @@ void scene_setup(void)
 		struct Entity* player = entity_find("player");
 		game_state->player_node = player->id;
 	}
+
+	FILE* obj_file = platform->file.open(DIRT_INSTALL, "obj_test.symtres", "r");
+	if(obj_file)
+	{
+		parser_load_objects(obj_file, "obj_test.symtres");
+		fclose(obj_file);
+	}
+	else
+	{
+		log_warning("Failed to open obj_test.symtres");
+	}
 }
 
 void debug(float dt)