parser: apparently i don't know how realloc works

Co-authored-by: tema5002 <tema5002@tuta.io>
Reviewed-on: #4
Co-committed-by: tema5002 <tema5002@tuta.io>

.gitignore

@@ -1,4 +1,7 @@
 /build
 /.zig-cache
 /zig-out
-noom
+.idea
+/noom
+/noom.*
+Makefile

build.lua

@@ -1,5 +1,5 @@
+#!/usr/bin/env lua
 -- i love build scripts i love build scripts i love build scripts scripts build love i script build love me i love script build i script love build
-
 local isBlendi = os.getenv("USER") == "blendi"
 local separator = package.config:sub(1,1)
 
@@ -13,9 +13,12 @@ local function filename(path)
 	return path:sub(s,e)
 end
 
-local function runCommand(cmd)
+local function runCommand(cmd, ignore_fail)
 	print("> " .. cmd)
-	return os.execute(cmd)
+	local result = os.execute(cmd)
+	if (result ~= true and result ~= 0) and (not ignore_fail) then
+		os.exit(1)
+	end
 end
 
 local function fixPath(path)
@@ -28,17 +31,43 @@ local function fixPath(path)
 	return new
 end
 
+if arg[1] == "clean" then
+	if separator == '\\' then
+		runCommand("rmdir /s /q build 2>nul", true)
+	else
+		runCommand("rm -rf build")
+	end
+	return
+end
+
+local needsDir = false
+
+if separator == '\\' then
+	needsDir = true
+else
+	-- TODO: maybe use exit code instead of the first return value?
+	local ok, _, code = os.execute('test -d build');
+
+	local exists = (ok == 0 or (ok == true and code == 0))
+
+	needsDir = not exists;
+end
+
+if needsDir then
 	if separator == '\\' then
 		runCommand('mkdir build 2>nul')
 	else
 		runCommand('mkdir -p build')
 	end
+end
 
 local files = {
+	'src/error.c',
 	'src/helper.c',
 	'src/lexer.c',
 	'src/parser.c',
 	'src/compiler.c',
+	'src/vm.c',
 	'src/main.c',
 }
 
@@ -47,7 +76,7 @@ local objects = {}
 local coolArgs = {}
 
 local function getTime(path)
-	local handle = io.popen('stat -c %Y "' .. path .. '" 2>/dev/null')
+	local handle = assert(io.popen('stat -c %Y "' .. path .. '" 2>/dev/null'))
 	local result = handle:read("*a")
 	handle:close()
 	return tonumber(result) or 0
@@ -73,14 +102,18 @@ for i = 1,#files do
 
 	if needsRebuild(fname, out) then
 		needsLinking = true
-		runCommand('clang -c -o ' .. out .. ' ' .. fname .. ' ' .. table.concat(coolArgs, ' '))
+		runCommand('clang -g -c -o ' .. out .. ' ' .. fname .. ' ' .. table.concat(coolArgs, ' '))
 	end
 
 	objects[#objects+1] = out;
 end
 
-local exe = separator == '\\' and "noom.exe" or "noom"
+local exe = separator == '\\' and ".\\noom.exe" or "./noom"
 
 if needsLinking then
-	runCommand('clang -o ' .. exe .. ' ' .. table.concat(objects, ' ') .. ' ' .. table.concat(coolArgs, ' '))
+	runCommand('clang -g -o ' .. exe .. ' ' .. table.concat(objects, ' ') .. ' ' .. table.concat(coolArgs, ' '))
+end
+
+if arg[1] == "run" then
+	runCommand(exe)
 end

build.zig

@@ -21,6 +21,7 @@ pub fn build(b: *std.Build) void {
 			"src/lexer.c",
 			"src/parser.c",
 			"src/compiler.c",
+			"src/vm.c",
 			"src/main.c",
 		}
 	});

shitass.lua

@@ -0,0 +1 @@
+local t <close> = {6; 2}

src/error.c

@@ -0,0 +1,159 @@
+#include "error.h"
+#include "helper.h"
+
+noom_uint_t noom_format_error(const noomP_Parser* parser, char* buffer, noom_uint_t buffer_size) {
+	struct noom_error {
+		const char* s;
+		int near; // 0:none 1: near '%s'\n 2: '%s'\n
+	};
+
+	static const struct noom_error parser_errors[] = {
+		[NOOMP_ERROR_NONE] = {0, 0},
+
+		[NOOMP_ERROR_OOM] = {"Whoops! Out of memory :(\n", 0},
+		[NOOMP_ERROR_EXPECTED_LCURLY] = {"expected '{'", 1},
+		[NOOMP_ERROR_EXPECTED_RCURLY] = {"expected '}' to close table literal", 1},
+		[NOOMP_ERROR_EXPECTED_RBRACKET_AFTER_KEY] = {"expected ']' to close computed key", 1},
+		[NOOMP_ERROR_EXPECTED_EQUALS_AFTER_KEY] = {"expected '=' after table key", 1},
+		[NOOMP_ERROR_EXPECTED_FIELD_IDENTIFIER] = {"expected identifier after '.' for field access", 1},
+		[NOOMP_ERROR_EXPECTED_METHOD_CALL] = {"expected identifier after ':' for method call", 1},
+		[NOOMP_ERROR_EXPECTED_RBRACKET_AFTER_INDEX] = {"expected ']' after index expression", 1},
+		[NOOMP_ERROR_EXPECTED_RPAREN_AFTER_EXPRESSION] = {"expected ')' after expression", 1},
+		[NOOMP_ERROR_EXPECTED_LPAREN_FOR_PARAMETERS] = {"expected '(' for function parameters", 1},
+		[NOOMP_ERROR_EXPECTED_RPAREN_FOR_PARAMETERS] = {"expected ')' for function parameters", 1},
+		[NOOMP_ERROR_EXPECTED_IDENTIFIER_AFTER_LOCAL_FUNCTION] = {"expected identifier after 'local function'\n", 0},
+		[NOOMP_ERROR_EXPECTED_IDENTIFIER_AFTER_FUNCTION] = {"expected identifier after 'function'\n", 0},
+		[NOOMP_ERROR_EXPECTED_END_AFTER_LOCAL_FUNCTION] = {"expected 'end' to close local function declaration", 1},
+		[NOOMP_ERROR_EXPECTED_END_AFTER_FUNCTION] = {"expected 'end' to close function declaration", 1},
+		[NOOMP_ERROR_EXPECTED_IDENTIFIER_AFTER_LOCAL] = {"expected identifier after 'local'\n", 0},
+		[NOOMP_ERROR_EXPECTED_IDENTIFIER_AFTER_LANGLE] = {"expected identifier after '<' for attribute\n", 0},
+		[NOOMP_ERROR_EXPECTED_RANGLE_TO_CLOSE_ATTRIBUTE] = {"expected '>' to close attribute after identifier", 1},
+		[NOOMP_ERROR_EXPECTED_THEN_AFTER_EXPRESSION] = {"expected 'then' after expression", 1},
+		[NOOMP_ERROR_EXPECTED_ELSE_ELSEIF_OR_END] = {"expected 'else', 'elseif', or 'end'", 1},
+		[NOOMP_ERROR_EXPECTED_END_AFTER_IF] = {"expected 'end' to close if statement", 1},
+		[NOOMP_ERROR_EXPECTED_DO_AFTER_EXPRESSION] = {"expected 'do' after expression", 1},
+		[NOOMP_ERROR_EXPECTED_END_AFTER_WHILE] = {"expected 'end' to close while statement", 1},
+		[NOOMP_ERROR_EXPECTED_END_AFTER_FOR] = {"expected 'end' to close for statement", 1},
+		[NOOMP_ERROR_EXPECTED_END_AFTER_DO] = {"expected 'end' to close do statement", 1},
+		[NOOMP_ERROR_EXPECTED_IDENTIFIER_AFTER_FOR] = {"expected identifier after 'for'\n", 1},
+		[NOOMP_ERROR_EXPECTED_VARIABLE_AFTER_COMMA_IN_FOR] = {"expected variable name after ',' in for loop\n", 0},
+		[NOOMP_ERROR_EXPECTED_IN] = {"expected 'in'", 1},
+		[NOOMP_ERROR_EXPECTED_UNTIL] = {"expected 'until' to close repeat expression", 1},
+		[NOOMP_ERROR_EXPECTED_IDENTIFIER_AFTER_GOTO] = {"expected identifier after goto\n", 0},
+		[NOOMP_ERROR_EXPECTED_COLONCOLON] = {"expected :: to end label identifier", 1},
+		[NOOMP_ERROR_INVALID_STATEMENT] = {"expected statement, got", 2},
+		// I want someone smarter than me [tema5002] to give these a proper description
+		// ^ alrighty then
+		[NOOMP_ERROR_EXPECTED_ASSIGNABLE] = {"expected assignable expression after comma in assignment", 1},
+		[NOOMP_ERROR_NOT_ASSIGNABLE] = {"expression in assignment is not assignable", 1},
+		[NOOMP_ERROR_EXPECTED_COMMA_OR_EQUAL_IN_ASSIGNMENT] = {"expected a comma or equals after assignable in assignment", 1},
+		[NOOMP_ERROR_EXPRESSION_NOT_STATEMENT] = {"loose expression is not a valid statement", 1},
+		[NOOMP_ERROR_FAKEATTRIBUTE] = {"invalid attribute", 2},
+		[NOOMP_ERROR_RETURN_NOT_END] = {"'return' must be the last statement in a block\n", 0},
+		[NOOMP_ERROR_FOR_WRONG_AMOUNT] = {"'for' initializer must have 2 or 3 expressions\n", 0}
+	};
+
+	static const struct noom_error lexer_errors[] = {
+		[NOOML_ERROR_NONE] = {0, 0},
+
+		[NOOML_ERROR_UNKNOWN] = {"unknown token", 1},
+		[NOOML_ERROR_MALFORMED_NUM] = {"malformed number", 1},
+		[NOOML_ERROR_UNFINISHED_COMMENT] = {"unfinished comment", 1},
+		[NOOML_ERROR_UNFINISHED_STRING] = {"unfinished string", 1},
+		[NOOML_ERROR_UNFINISHED_LONG_STRING] = {"unfinished long string", 1},
+		[NOOML_ERROR_DECIMAL_ESCAPE_TOO_BIG] = {"decimal escape sequence too big (max 255)", 1},
+		[NOOML_ERROR_HEX_ESCAPE_INVALID] = {"invalid hexadecimal escape sequence", 1},
+		[NOOML_ERROR_UNICODE_ESCAPE_UNOPENED] = {"expected '{' after '\\u' for Unicode escape", 1},
+		[NOOML_ERROR_UNICODE_ESCAPE_UNCLOSED] = {"expected '}' to close Unicode escape sequence", 1},
+		[NOOML_ERROR_UNICODE_ESCAPE_TOO_BIG] = {"Unicode escape sequence exceeds maximum (0x10FFFF)", 1},
+	};
+
+	noomP_Error base_err = parser->error_state;
+	noom_uint_t lexer_code = 0;
+	noom_uint_t pos = 0;
+
+	if (parser->error_state & NOOMP_ERROR_LEXER) {
+		base_err = NOOMP_ERROR_LEXER;
+		lexer_code = parser->error_state & ~NOOMP_ERROR_LEXER;
+	}
+
+	struct noom_error err = (base_err == NOOMP_ERROR_LEXER) ? lexer_errors[lexer_code] : parser_errors[base_err];
+
+	noom_uint_t row = 1, column = 1;
+	for (noom_uint_t i = 0; i < parser->lex_offset; i++) {
+		if (parser->code[i] == '\n') {
+			row++;
+			column = 1;
+		}
+		else {
+			column++;
+		}
+	}
+
+	if (buffer == 0) {
+		noom_uint_t linedig = 0;
+		for (noom_uint_t n = row; n; n /= 10, linedig++);
+
+		noom_uint_t space = 0;
+
+		space = 
+			sizeof("noom: ") - 1 +
+			noom_strlen(parser->filename) +
+			sizeof(":") - 1 +
+			linedig +
+			sizeof(":") - 1 +
+			noom_strlen(err.s) +
+			+ 1; // \0;
+
+		if (err.near) {
+			space += (
+				(err.near == 1 ? sizeof(" near") - 1 : 0) +
+				sizeof(" '") - 1 +
+				parser->last_token_length +
+				sizeof("'\n") - 1
+			);
+		}
+
+		return space;
+	}
+
+	noom_safe_strcpy(buffer, &pos, buffer_size, "noom: ");
+	noom_safe_strcpy(buffer, &pos, buffer_size, parser->filename);
+	noom_safe_strcpy(buffer, &pos, buffer_size, ":");
+
+	char num_buf[20];
+	noom_uint_t num_len = 0;
+	
+	if (row == 0) {
+		num_buf[num_len++] = '0';
+	} else {
+		noom_uint_t temp = row;
+		noom_uint_t divisor = 1;
+		while (temp / divisor >= 10) divisor *= 10;
+		while (divisor > 0) {
+			num_buf[num_len++] = '0' + (temp / divisor);
+			temp %= divisor;
+			divisor /= 10;
+		}
+	}
+
+	for (noom_uint_t i = 0; i < num_len && pos < buffer_size - 1; i++) {
+		buffer[pos++] = num_buf[i];
+	}
+
+	noom_safe_strcpy(buffer, &pos, buffer_size, ":");
+	noom_safe_strcpy(buffer, &pos, buffer_size, err.s);
+	if (err.near) {
+		if (err.near == 1) {
+			noom_safe_strcpy(buffer, &pos, buffer_size, " near");
+		}
+		noom_safe_strcpy(buffer, &pos, buffer_size, " '");
+		for (noom_uint_t i = 0; i < parser->last_token_length && pos < buffer_size - 1; i++) {
+			buffer[pos++] = parser->code[parser->last_token_offset + i];
+		}
+		noom_safe_strcpy(buffer, &pos, buffer_size, "'\n");
+	}
+	
+	if (pos < buffer_size) buffer[pos] = '\0';
+	return pos;
+}

src/error.h

@@ -0,0 +1,6 @@
+// js let me use include guards 🥀🥀🥀🥀🥀🥀🥀
+// ^ header guards r 4 noobz!
+#include "types.h"
+#include "parser.h"
+
+noom_uint_t noom_format_error(const noomP_Parser* parser, char* buffer, noom_uint_t buffer_size);

src/helper.c

@@ -2,6 +2,11 @@
 #include "types.h"
 
 int noom_startswith(const char* str, const char* compare) {
+#ifdef __has_builtin
+#if __has_builtin(__builtin_strncmp)
+	return __builtin_strncmp(compare, str, noom_strlen(compare)) == 0;
+#endif
+#endif
 	noom_uint_t i = 0;
 	while (1) {
 		if (compare[i] == '\0') return 1; // we did it
@@ -21,6 +26,33 @@ int noom_streql(const char* stra, noom_uint_t lena, const char* strb, noom_uint_
 	return 1;
 }
 
+noom_uint_t noom_strlen(const char *s) {
+#ifdef __has_builtin
+#if __has_builtin(__builtin_strlen)
+	return __builtin_strlen(s);
+#endif
+#endif
+	const char *a = s;
+	while (*s) s++;
+	return s - a;
+}
+
+int noom_strcmp(const char *a, const char *b) {
+#ifdef __has_builtin
+#if __has_builtin(__builtin_strcmp)
+	return __builtin_strcmp(a, b);
+#endif
+#endif
+	for (; *a && *a == *b; a++, b++);
+	return *(const unsigned char*)a - *(const unsigned char*)b;
+}
+
+void noom_safe_strcpy(char* buffer, noom_uint_t* pos, noom_uint_t buffer_size, const char* src) {
+	while (*src && *pos < buffer_size - 1) {
+		buffer[(*pos)++] = *src++;
+	}
+}
+
 #include <stdlib.h> // TODO: remove
 
 void* noom_alloc(noom_uint_t size) {

src/helper.h

@@ -2,6 +2,9 @@
 
 int noom_startswith(const char* str, const char* compare);
 int noom_streql(const char* stra, noom_uint_t lena, const char* strb, noom_uint_t lenb); // rename to something better?
+noom_uint_t noom_strlen(const char *s);
+int noom_strcmp(const char *a, const char* b);
+void noom_safe_strcpy(char* buffer, noom_uint_t* pos, noom_uint_t buffer_size, const char* src);
 
 void* noom_alloc(noom_uint_t size);
 void noom_free(void* ptr);

src/main.c

@@ -1,7 +1,7 @@
 #include <stdio.h> // for now
-// #include "lexer.h"
-#include "parser.h"
 #include "helper.h"
+#include "error.h"
+#include "types.h"
 
 void tab(noom_uint_t amount) {
 	amount *= 2;
@@ -10,7 +10,7 @@ void tab(noom_uint_t amount) {
 	}
 }
 
-void print_node(noomP_Node* node, noom_uint_t depth) {
+void print_node(const noomP_Node *node, noom_uint_t depth) {
 	tab(depth);
 	printf("{\n");
 
@@ -31,39 +31,65 @@ void print_node(noomP_Node* node, noom_uint_t depth) {
 	printf("}\n");
 }
 
-int main(int argc, char** argv) {
+int the_theoretical_function_to_execute_your_code_that_should_be_replaced_later(const char *code, const char *filename) {
-	// uhh uhhh uhhhhh
+	noomP_Parser parser;
-	const char* code = "local t = {'a'; 2; 6}";
+	noomP_Node *program;
+	
+	// goodbye "shitass" you will be missed
+	int success = noomP_parse(code, filename, NOOM_VERSION_54, &program, &parser);
+	if (success == 0) {
+		puts("LEX OUTPUT:");
+		fputs("\x1b[48;2;10;10;10m", stdout);
 		noom_uint_t pos = 0;
-
-	printf("LEX OUTPUT:\n");
-
-	noomL_Token token;
 		while (1) {
-		noomL_lex(code, pos, &token, NOOM_VERSION_54);
+			noomL_Token token;
 
+			noomL_ErrorType err = noomL_lex(code, pos, &token, NOOM_VERSION_54);
+			if (err) break;
+
+			if (token.type == NOOML_TOKEN_KEYWORD) {
+				fputs("\x1b[38;2;207;142;109m", stdout);
+				for (noom_uint_t i = 0; i < token.length; i++) putchar((code + token.offset)[i]);
+			} else if (token.type == NOOML_TOKEN_WHITESPACE) {
+				for (noom_uint_t i = 0; i < token.length; i++) putchar((code + token.offset)[i]);
+			} else if (token.type == NOOML_TOKEN_IDENTIFIER) {
+				fputs("\x1b[38;2;255;255;255m", stdout);
+				for (noom_uint_t i = 0; i < token.length; i++) putchar((code + token.offset)[i]);
+			} else if (token.type == NOOML_TOKEN_SYMBOL) {
+				fputs("\x1b[38;2;0;255;255m", stdout);
+				for (noom_uint_t i = 0; i < token.length; i++) putchar((code + token.offset)[i]);
+			} else if (token.type == NOOML_TOKEN_STRING) {
+				fputs("\x1b[38;2;255;0;0m", stdout);
+				for (noom_uint_t i = 0; i < token.length; i++) putchar((code + token.offset)[i]);
+			} else if (token.type == NOOML_TOKEN_NUMBER) {
+				fputs("\x1b[38;2;0;255;0m", stdout);
+				for (noom_uint_t i = 0; i < token.length; i++) putchar((code + token.offset)[i]);
+			} else {
+				fputs("\x1b[0m\n", stdout);
 				printf("%s ", noomL_formatTokenType(token.type));
 				for (noom_uint_t i = 0; i < token.length; i++) putchar((code + token.offset)[i]);
+				fputs("\x1b[48;2;10;10;10m", stdout);
 				putchar('\n');
+			}
 
 			pos += token.length;
 
 			if (token.type == NOOML_TOKEN_EOF) break;
 		}
-
+		puts("\x1b[0m");
-	// time for parser testing
+		puts("PARSE OUTPUT:");
-	printf("\nPARSE OUTPUT:\n");
-
-	noomP_Node *program;
-	noomP_Node *last_node;
-
-	int success = noomP_parse(code, "shitass", NOOM_VERSION_54, &program, &last_node);
-	if (success != 0) return success;
-
 		print_node(program, 0);
+	}
+	else {
+		noom_uint_t bleh = noom_format_error(&parser, NULL, 0);
+		char* buf = noom_alloc(bleh);
+		noom_format_error(&parser, buf, bleh);
+		fputs(buf, stdout);
+		noom_free(buf);
+	}
 	
 	// freeing time
-
+	noomP_Node *last_node = parser.last_node;
 	while (last_node) {
 		noomP_Node *next = last_node->previous_node;
 		// subnodes could be null if we OOM'd during a realloc of it
@@ -71,6 +97,169 @@ int main(int argc, char** argv) {
 		noom_free(last_node);
 		last_node = next;
 	}
+	return success;
+}
 
+static char* read_file(const char* filename) {
+	FILE* file = fopen(filename, "r");
+	if (file == 0) {
+		fprintf(stderr, "Failed to open '%s'.\n", filename);
 		return 0;
 	}
+
+	fseek(file, 0, SEEK_END);
+	const unsigned long filesize = ftell(file);
+	fseek(file, 0, SEEK_SET);
+
+	char* buffer = noom_alloc(filesize + 1);
+
+	if (fread(buffer, 1, filesize, file) != filesize) {
+		fprintf(stderr, "Reached the end of the file\n");
+		return 0;
+	}
+	buffer[filesize] = '\0';
+	
+	fclose(file);
+	return buffer;
+}
+
+static char* read_stdin() {
+	noom_uint_t capacity = 4096;
+	noom_uint_t size = 0;
+	char* buffer = noom_alloc(capacity);
+    
+	size_t n;
+	while ((n = fread(buffer + size, 1, capacity - size, stdin)) > 0) {
+		size += n;
+		if (size == capacity) {
+			capacity *= 2;
+			buffer = noom_realloc(buffer, capacity);
+		}
+	}
+	
+	buffer[size] = '\0';
+	return buffer;
+}
+
+// code stolen from my different project
+static int read_prompt(char* buf, int buf_size, char* prompt, const int required) {
+	do {
+		printf("%s", prompt);
+		fflush(stdout);
+		if (!fgets(buf, buf_size, stdin)) return 1;
+		const size_t len = noom_strlen(buf);
+		if (len > 0 && buf[len - 1] != '\n') {
+			while (getchar() != '\n' && !feof(stdin)) ;
+		}
+		else if (len > 0) {
+			buf[len - 1] = '\0';
+		}	
+	} while (buf[0] == '\0' && required);
+	return 0;
+}
+
+int main(int argc, char **argv) {
+	const char *err = 0;
+	struct {
+		noom_bool_t enter_repl;
+		noom_bool_t use_stdin;
+		const char* script_exec;
+		const char* script_path;
+		noom_bool_t do_i_already_know_what_to_do;
+	} params = {0};
+	
+	if (argc < 2) {
+		params.enter_repl = 1;
+		params.do_i_already_know_what_to_do = 1;
+    }
+
+	for (int i = 1; i < argc; i++) {
+        if (noom_strcmp(argv[i], "-") == 0) {
+            params.use_stdin = 1;
+			params.do_i_already_know_what_to_do = 1;
+        	continue;
+        }
+
+        if (noom_strcmp(argv[i], "--") == 0) {
+	        if (++i >= argc) break;
+        	if (params.do_i_already_know_what_to_do) {
+        		err = "too many arguments";
+        		goto die;
+        	}
+        	params.script_exec = argv[i];
+        	params.do_i_already_know_what_to_do = 1;
+        	continue;
+        }
+
+        if (argv[i][0] != '-') {
+        	if (params.do_i_already_know_what_to_do) {
+        		err = "too many arguments";
+        		goto die;
+        	}
+            params.script_path = argv[i];
+        	params.do_i_already_know_what_to_do = 1;
+        	continue;
+        }
+
+		if (argv[i][1] == 'e') {
+			if (params.do_i_already_know_what_to_do) {
+				goto die;
+			}
+			/* "-estat" or "-e stat" */
+			if (argv[i][2] != '\0') {
+				params.script_exec = argv[i] + 2;
+				params.do_i_already_know_what_to_do = 1;
+				continue;
+			}
+			
+			if (++i >= argc) {
+				err = "-e needs an argument";
+				goto die;
+			}
+			params.script_exec = argv[i];
+			params.do_i_already_know_what_to_do = 1;
+		}
+		
+        if (argv[i][1] == 'v') {
+	        puts(NOOM_VERSION_TEXT);
+        	return 0;
+        }
+		
+		err = "unknown option";
+		goto die;
+    }
+	if (!params.do_i_already_know_what_to_do) {
+		err = "script not set";
+		goto die;
+	}
+	if (params.script_exec || params.script_path) {
+		if (params.script_exec) {
+			return the_theoretical_function_to_execute_your_code_that_should_be_replaced_later(params.script_exec, "(command line)");
+		}
+		char* code = read_file(params.script_path);
+		if (code == 0) return 1;
+		return the_theoretical_function_to_execute_your_code_that_should_be_replaced_later(code, params.script_path);
+	}
+	if (params.use_stdin) {
+		char* code = read_stdin();
+		if (code == 0) return 1;
+		return the_theoretical_function_to_execute_your_code_that_should_be_replaced_later(code, "stdin");
+	}
+	if (params.enter_repl) {
+		puts(NOOM_VERSION_TEXT);
+		for (;;) {
+			char code[4096];
+			if (read_prompt(code, sizeof(code), "> ", 1)) return 0;
+			the_theoretical_function_to_execute_your_code_that_should_be_replaced_later(code, "(noom input)");
+		}
+	}
+die:
+    fprintf(stderr, "%s: %s\n"
+		"usage: %s [options] [script [args]]\n"
+		"Available options are:\n"
+		"  -         execute stdin\n"
+		"  -e stat   execute string 'stat'\n"
+		"  -v        show version\n",
+		argv[0], err, argv[0]);
+	return 1;
+}

src/noom.h

@@ -3,6 +3,19 @@
 #ifndef NOOM_H
 #define NOOM_H
 
+#define NN_STR(x) #x
+#define NN_XSTR(x) NN_STR(x)
+
+#define NOOM_VERSION_MAJOR 0
+#define NOOM_VERSION_MINOR 0
+#define NOOM_VERSION_PATCH 0
+#if NOOM_VERSION_PATCH==0
+#define NOOM_VERSION_FULL NN_XSTR(NOOM_VERSION_MAJOR) "." NN_XSTR(NOOM_VERSION_MINOR)
+#else
+#define NOOM_VERSION_FULL NN_XSTR(NOOM_VERSION_MAJOR) "." NN_XSTR(NOOM_VERSION_MINOR) "." NN_XSTR(NOOM_VERSION_PATCH)
+#endif
+#define NOOM_VERSION_TEXT "Noom " NOOM_VERSION_FULL "  (C) 2026 NeoFlock and Noom contributors"
+
 typedef enum noom_LuaVersion {
 	// no 5.0, at least for now, cause it doesn't seem to be used much and is a bit *weird*
 	NOOM_VERSION_51,
@@ -45,4 +58,7 @@ typedef struct noom_LuaVM noom_LuaVM;
 typedef noom_Exit noom_CFunction(noom_LuaVM *vm);
 typedef noom_Exit noom_KFunction(noom_LuaVM *vm, noom_Exit status, void *ctx);
 
+noom_LuaVM *noom_createVM(noom_LuaVersion version);
+void noom_destroyVM(noom_LuaVM *vm);
+
 #endif

src/parser.c

@@ -110,6 +110,11 @@ int noomP_peek(noomP_Parser* parser, noomL_Token* token) {
 			continue;
 		}
 
+		if (token->type != NOOML_TOKEN_EOF) {
+			parser->last_token_offset = token->offset;
+			parser->last_token_length = token->length;
+		}
+		
 		return 0;
 	}
 }
@@ -127,8 +132,6 @@ noomP_Node* noomP_allocNode(noomP_Parser* parser) {
 		return 0;
 	}
 
-	node->previous_node = parser->last_node;
-
 	node->subnodec = 0;
 	node->subnodes = noom_alloc(sizeof(noomP_Node*) * 2);
 	node->subnode_cap = 2;
@@ -138,6 +141,7 @@ noomP_Node* noomP_allocNode(noomP_Parser* parser) {
 		return 0;
 	}
 
+	node->previous_node = parser->last_node;
 	parser->last_node = node;
 
 	return node;
@@ -145,13 +149,15 @@ noomP_Node* noomP_allocNode(noomP_Parser* parser) {
 
 int noomP_addSubnode(noomP_Parser* parser, noomP_Node* node, noomP_Node* subnode) {
 	if (node->subnodec == node->subnode_cap) {
-		node->subnode_cap = node->subnode_cap * 2;
+		noomP_Node** new = noom_realloc(node->subnodes, sizeof(noomP_Node*) * node->subnode_cap * 2);
-		node->subnodes = noom_realloc(node->subnodes, sizeof(noomP_Node*) * node->subnode_cap);
 	
-		if (node->subnodes == 0) {
+		if (new == 0) {
-			parser->error_state = NOOMP_ERROR_OOM;
+			parser->error_state = NOOMP_ERROR_OOM; // well fuck
 			return 1;
 		}
+		
+		node->subnodes = new;
+		node->subnode_cap = node->subnode_cap * 2;
 	}
 
 	node->subnodes[node->subnodec++] = subnode;
@@ -164,7 +170,7 @@ noomP_Node* noomP_parseTableLiteral(noomP_Parser* parser) {
 
 	if (noomP_peek(parser, &token)) return 0;
 	if (token.type != NOOML_TOKEN_SYMBOL || !noom_streql(parser->code + token.offset, token.length, "{", 1)) {
-		parser->error_state = NOOMP_ERROR_UNEXPECTED;
+		parser->error_state = NOOMP_ERROR_EXPECTED_LCURLY;
 		return 0;
 	}
 	noomP_skip(parser, &token);
@@ -195,14 +201,14 @@ noomP_Node* noomP_parseTableLiteral(noomP_Parser* parser) {
 
 			if (noomP_peek(parser, &token)) return 0;
 			if (token.type != NOOML_TOKEN_SYMBOL || !noom_streql(parser->code + token.offset, token.length, "]", 1)) {
-				parser->error_state = NOOMP_ERROR_UNEXPECTED;
+				parser->error_state = NOOMP_ERROR_EXPECTED_RBRACKET_AFTER_KEY;
 				return 0;
 			}
 			noomP_skip(parser, &token);
 
 			if (noomP_peek(parser, &token)) return 0;
 			if (token.type != NOOML_TOKEN_SYMBOL || !noom_streql(parser->code + token.offset, token.length, "=", 1)) {
-				parser->error_state = NOOMP_ERROR_UNEXPECTED;
+				parser->error_state = NOOMP_ERROR_EXPECTED_EQUALS_AFTER_KEY;
 				return 0;
 			}
 			noomP_skip(parser, &token);
@@ -279,7 +285,7 @@ noomP_Node* noomP_parseTableLiteral(noomP_Parser* parser) {
 	
 	if (noomP_peek(parser, &token)) return 0;
 	if (token.type != NOOML_TOKEN_SYMBOL || !noom_streql(parser->code + token.offset, token.length, "}", 1)) {
-		parser->error_state = NOOMP_ERROR_UNEXPECTED;
+		parser->error_state = NOOMP_ERROR_EXPECTED_RCURLY;
 		return 0;
 	}
 	noomP_skip(parser, &token);
@@ -301,7 +307,7 @@ noomP_Node* noomP_parseComplexExpression(noomP_Parser* parser, noomP_Node* snode
 
 				if (noomP_peek(parser, &token)) return 0;
 				if (token.type != NOOML_TOKEN_IDENTIFIER) {
-					parser->error_state = NOOMP_ERROR_UNEXPECTED;
+					parser->error_state = NOOMP_ERROR_EXPECTED_FIELD_IDENTIFIER;
 					return 0;
 				}
 				noomP_skip(parser, &token); // skip the field name
@@ -332,7 +338,7 @@ noomP_Node* noomP_parseComplexExpression(noomP_Parser* parser, noomP_Node* snode
 				if (noomP_peek(parser, &token)) return 0; // look for ]
 				if (token.type != NOOML_TOKEN_SYMBOL || (!noom_streql(parser->code + token.offset, token.length, "]", 1))) {
 					// damn it :(
-					parser->error_state = NOOMP_ERROR_UNEXPECTED;
+					parser->error_state = NOOMP_ERROR_EXPECTED_RBRACKET_AFTER_INDEX;
 					return 0;
 				}
 				noomP_skip(parser, &token); // skip ]
@@ -379,7 +385,7 @@ noomP_Node* noomP_parseComplexExpression(noomP_Parser* parser, noomP_Node* snode
 				// check for )
 				if (noomP_peek(parser, &token)) return 0;
 				if (token.type != NOOML_TOKEN_SYMBOL || (!noom_streql(parser->code + token.offset, token.length, ")", 1))) {
-					parser->error_state = NOOMP_ERROR_UNEXPECTED;
+					parser->error_state = NOOMP_ERROR_EXPECTED_RPAREN_AFTER_EXPRESSION;
 					return 0;
 				}
 
@@ -449,7 +455,7 @@ noomP_Node* noomP_parseComplexExpression(noomP_Parser* parser, noomP_Node* snode
 					// check for )
 					if (noomP_peek(parser, &token)) return 0;
 					if (token.type != NOOML_TOKEN_SYMBOL || (!noom_streql(parser->code + token.offset, token.length, ")", 1))) {
-						parser->error_state = NOOMP_ERROR_UNEXPECTED;
+						parser->error_state = NOOMP_ERROR_EXPECTED_RPAREN_AFTER_EXPRESSION;
 						return 0;
 					}
 					noomP_skip(parser, &token);
@@ -602,7 +608,7 @@ noomP_Node* noomP_parseRawExpression(noomP_Parser* parser) {
 
 			if (noomP_peek(parser, &token)) return 0;
 			if (token.type != NOOML_TOKEN_SYMBOL || !noom_streql(parser->code + token.offset, token.length, ")", 1)) {
-				parser->error_state = NOOMP_ERROR_UNEXPECTED;
+				parser->error_state = NOOMP_ERROR_EXPECTED_RPAREN_AFTER_EXPRESSION;
 				return 0; // unexpected
 			}
 			noomP_skip(parser, &token);
@@ -838,7 +844,7 @@ noomP_Node* noomP_parseFunctionParameters(noomP_Parser* parser) {
 
 	if (noomP_peek(parser, &token)) return 0;
 	if (token.type != NOOML_TOKEN_SYMBOL || !noom_streql(parser->code + token.offset, token.length, "(", 1)) {
-		parser->error_state = NOOMP_ERROR_UNEXPECTED;
+		parser->error_state = NOOMP_ERROR_EXPECTED_LPAREN_FOR_PARAMETERS;
 		return 0;
 	}
 	noomP_skip(parser, &token);
@@ -890,7 +896,7 @@ noomP_Node* noomP_parseFunctionParameters(noomP_Parser* parser) {
 	// closing paren
 	if (noomP_peek(parser, &token)) return 0;
 	if (token.type != NOOML_TOKEN_SYMBOL || !noom_streql(parser->code + token.offset, token.length, ")", 1)) {
-		parser->error_state = NOOMP_ERROR_UNEXPECTED;
+		parser->error_state = NOOMP_ERROR_EXPECTED_RPAREN_FOR_PARAMETERS;
 		return 0;
 	}
 	noomP_skip(parser, &token);
@@ -954,7 +960,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 				
 				if (noomP_peek(parser, &token)) return 0;
 				if (token.type != NOOML_TOKEN_IDENTIFIER) {
-					parser->error_state = NOOMP_ERROR_UNEXPECTED;
+					parser->error_state = NOOMP_ERROR_EXPECTED_IDENTIFIER_AFTER_LOCAL_FUNCTION;
 					return 0;
 				}
 				noomP_skip(parser, &token);
@@ -977,7 +983,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 
 				if (noomP_peek(parser, &token)) return 0;
 				if (token.type != NOOML_TOKEN_KEYWORD || !noom_streql(parser->code + token.offset, token.length, "end", 3)) {
-					parser->error_state = NOOMP_ERROR_UNEXPECTED;
+					parser->error_state = NOOMP_ERROR_EXPECTED_END_AFTER_LOCAL_FUNCTION;
 					return 0;
 				}
 				noomP_skip(parser, &token);
@@ -995,7 +1001,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 				if (noomP_peek(parser, &token)) return 0;
 
 				if (token.type != NOOML_TOKEN_IDENTIFIER) {
-					parser->error_state = NOOMP_ERROR_UNEXPECTED;
+					parser->error_state = NOOMP_ERROR_EXPECTED_IDENTIFIER_AFTER_LOCAL;
 					return 0;
 				}
 				noomP_skip(parser, &token);
@@ -1016,7 +1022,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 						// the attribute is an identifier.
 						if (noomP_peek(parser, &token)) return 0;
 						if (token.type != NOOML_TOKEN_IDENTIFIER) {
-							parser->error_state = NOOMP_ERROR_UNEXPECTED;
+							parser->error_state = NOOMP_ERROR_EXPECTED_IDENTIFIER_AFTER_LANGLE;
 							return 0; // unexpected
 						}
 						noom_uint_t attr = token.offset;
@@ -1029,7 +1035,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 
 						if (noomP_peek(parser, &token)) return 0;
 						if (token.type != NOOML_TOKEN_SYMBOL || !noom_streql(parser->code + token.offset, token.length, ">", 1)) {
-							parser->error_state = NOOMP_ERROR_UNEXPECTED;
+							parser->error_state = NOOMP_ERROR_EXPECTED_RANGLE_TO_CLOSE_ATTRIBUTE;
 							return 0;
 						}
 						noomP_skip(parser, &token);
@@ -1105,7 +1111,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 			if (noomP_peek(parser, &token)) return 0;
 
 			if (token.type != NOOML_TOKEN_KEYWORD || !noom_streql(parser->code + token.offset, token.length, "then", 4)) {
-				parser->error_state = NOOMP_ERROR_UNEXPECTED;
+				parser->error_state = NOOMP_ERROR_EXPECTED_THEN_AFTER_EXPRESSION;
 				return 0; // unexpected
 			}
 
@@ -1120,7 +1126,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 				if (noomP_peek(parser, &token)) return 0;
 
 				if (token.type != NOOML_TOKEN_KEYWORD) {
-					parser->error_state = NOOMP_ERROR_UNEXPECTED;
+					parser->error_state = NOOMP_ERROR_EXPECTED_ELSE_ELSEIF_OR_END;
 					return 0; // unexpected
 				}
 
@@ -1135,7 +1141,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 					if (noomP_peek(parser, &token)) return 0;
 
 					if (token.type != NOOML_TOKEN_KEYWORD || !noom_streql(parser->code + token.offset, token.length, "then", 4)) {
-						parser->error_state = NOOMP_ERROR_UNEXPECTED;
+						parser->error_state = NOOMP_ERROR_EXPECTED_THEN_AFTER_EXPRESSION;
 						return 0; // unexpected
 					}
 					noomP_skip(parser, &token);
@@ -1161,14 +1167,14 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 					break; // will check for end outside the loop because else and things
 				} else {
 					// unexpected
-					parser->error_state = NOOMP_ERROR_UNEXPECTED;
+					parser->error_state = NOOMP_ERROR_EXPECTED_ELSE_ELSEIF_OR_END;
 					return 0;
 				}
 			}
 
 			if (noomP_peek(parser, &token)) return 0;
 			if (token.type != NOOML_TOKEN_KEYWORD || !noom_streql(parser->code + token.offset, token.length, "end", 3)) {
-				parser->error_state = NOOMP_ERROR_UNEXPECTED;
+				parser->error_state = NOOMP_ERROR_EXPECTED_END_AFTER_IF;
 				return 0; // unexpected
 			}
 			noomP_skip(parser, &token);
@@ -1191,7 +1197,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 			if (noomP_peek(parser, &token)) return 0;
 
 			if (token.type != NOOML_TOKEN_KEYWORD || !noom_streql(parser->code + token.offset, token.length, "do", 2)) {
-				parser->error_state = NOOMP_ERROR_UNEXPECTED;
+				parser->error_state = NOOMP_ERROR_EXPECTED_DO_AFTER_EXPRESSION;
 				return 0; // unexpected
 			}
 			noomP_skip(parser, &token); // skip `do`
@@ -1203,7 +1209,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 
 			if (noomP_peek(parser, &token)) return 0;
 			if (token.type != NOOML_TOKEN_KEYWORD || !noom_streql(parser->code + token.offset, token.length, "end", 3)) {
-				parser->error_state = NOOMP_ERROR_UNEXPECTED;
+				parser->error_state = NOOMP_ERROR_EXPECTED_END_AFTER_WHILE;
 				return 0; // unexpected
 			}
 			noomP_skip(parser, &token); // skip `end`
@@ -1241,7 +1247,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 			fname->source_offset = token.offset;
 
 			if (token.type != NOOML_TOKEN_IDENTIFIER) { 
-				parser->error_state = NOOMP_ERROR_UNEXPECTED;
+				parser->error_state = NOOMP_ERROR_EXPECTED_IDENTIFIER_AFTER_FUNCTION;
 				return 0; // unex.
 			}
 			noomP_skip(parser, &token);
@@ -1266,7 +1272,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 					if (noomP_peek(parser, &token)) return 0;
 
 					if (token.type != NOOML_TOKEN_IDENTIFIER) {
-						parser->error_state = NOOMP_ERROR_UNEXPECTED;
+						parser->error_state = NOOMP_ERROR_EXPECTED_FIELD_IDENTIFIER;
 						return 0;
 					}
 					noomP_skip(parser, &token);
@@ -1283,7 +1289,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 
 					if (noomP_peek(parser, &token)) return 0;
 					if (token.type != NOOML_TOKEN_IDENTIFIER) {
-						parser->error_state = NOOMP_ERROR_UNEXPECTED;
+						parser->error_state = NOOMP_ERROR_EXPECTED_METHOD_CALL;
 						return 0;
 					}
 					noomP_skip(parser, &token);
@@ -1317,7 +1323,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 			// remove `end`
 			if (noomP_peek(parser, &token)) return 0;
 			if (token.type != NOOML_TOKEN_KEYWORD || !noom_streql(parser->code + token.offset, token.length, "end", 3)) {
-				parser->error_state = NOOMP_ERROR_UNEXPECTED;
+				parser->error_state = NOOMP_ERROR_EXPECTED_END_AFTER_FUNCTION;
 				return 0;
 			}
 			noomP_skip(parser, &token);
@@ -1419,7 +1425,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 
 			if (noomP_peek(parser, &token)) return 0;
 			if (token.type != NOOML_TOKEN_IDENTIFIER) {
-				parser->error_state = NOOMP_ERROR_UNEXPECTED;
+				parser->error_state = NOOMP_ERROR_EXPECTED_IDENTIFIER_AFTER_FOR;
 				return 0;
 			}
 			noom_uint_t vname = token.offset;
@@ -1469,7 +1475,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 					while (1) {
 						if (noomP_peek(parser, &token)) return 0;
 						if (token.type != NOOML_TOKEN_IDENTIFIER) {
-							parser->error_state = NOOMP_ERROR_UNEXPECTED;
+							parser->error_state = NOOMP_ERROR_EXPECTED_VARIABLE_AFTER_COMMA_IN_FOR;
 							return 0;
 						}
 						noomP_skip(parser, &token);
@@ -1495,7 +1501,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 				// okay. that took a while. now for the in and the expressions
 				if (noomP_peek(parser, &token)) return 0;
 				if (token.type != NOOML_TOKEN_KEYWORD || !noom_streql(parser->code + token.offset, token.length, "in", 2)) {
-					parser->error_state = NOOMP_ERROR_UNEXPECTED;
+					parser->error_state = NOOMP_ERROR_EXPECTED_IN;
 					return 0;
 				}
 				noomP_skip(parser, &token);
@@ -1520,7 +1526,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 			// making this the same for all of them: do [block] end
 			if (noomP_peek(parser, &token)) return 0;
 			if (token.type != NOOML_TOKEN_KEYWORD || !noom_streql(parser->code + token.offset, token.length, "do", 2)) {
-				parser->error_state = NOOMP_ERROR_UNEXPECTED;
+				parser->error_state = NOOMP_ERROR_EXPECTED_DO_AFTER_EXPRESSION;
 				return 0;
 			}
 			noomP_skip(parser, &token);
@@ -1532,7 +1538,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 
 			if (noomP_peek(parser, &token)) return 0;
 			if (token.type != NOOML_TOKEN_KEYWORD || !noom_streql(parser->code + token.offset, token.length, "end", 3)) {
-				parser->error_state = NOOMP_ERROR_UNEXPECTED;
+				parser->error_state = NOOMP_ERROR_EXPECTED_END_AFTER_FOR;
 				return 0;
 			}
 			noomP_skip(parser, &token);
@@ -1549,7 +1555,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 			
 			if (noomP_peek(parser, &token)) return 0;
 			if (token.type != NOOML_TOKEN_IDENTIFIER) {
-				parser->error_state = NOOMP_ERROR_UNEXPECTED;
+				parser->error_state = NOOMP_ERROR_EXPECTED_IDENTIFIER_AFTER_GOTO;
 				return 0;
 			}
 			noomP_skip(parser, &token);
@@ -1579,7 +1585,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 
 			if (noomP_peek(parser, &token)) return 0;
 			if (token.type != NOOML_TOKEN_KEYWORD || !noom_streql(parser->code + token.offset, token.length, "until", 5)) {
-				parser->error_state = NOOMP_ERROR_UNEXPECTED;
+				parser->error_state = NOOMP_ERROR_EXPECTED_UNTIL;
 				return 0;
 			}
 			noomP_skip(parser, &token);
@@ -1607,7 +1613,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 
 			if (noomP_peek(parser, &token)) return 0;
 			if (token.type != NOOML_TOKEN_KEYWORD || !noom_streql(parser->code + token.offset, token.length, "end", 3)) {
-				parser->error_state = NOOMP_ERROR_UNEXPECTED;
+				parser->error_state = NOOMP_ERROR_EXPECTED_END_AFTER_DO;
 				return 0;
 			}
 			noomP_skip(parser, &token);
@@ -1638,7 +1644,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 
 			if (noomP_peek(parser, &token)) return 0;
 			if (token.type != NOOML_TOKEN_SYMBOL || !noom_streql(parser->code + token.offset, token.length, "::", 2)) {
-				parser->error_state = NOOMP_ERROR_UNEXPECTED;
+				parser->error_state = NOOMP_ERROR_EXPECTED_COLONCOLON;
 				return 0;
 			}
 			noomP_skip(parser, &token);
@@ -1681,7 +1687,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 						
 						if (token.type != NOOML_TOKEN_IDENTIFIER && (token.type != NOOML_TOKEN_SYMBOL || !noom_streql(parser->code + token.offset, token.length, "(", 1))) {
 							// unexpected
-							parser->error_state = NOOMP_ERROR_UNEXPECTED;
+							parser->error_state = NOOMP_ERROR_EXPECTED_ASSIGNABLE;
 							return 0;
 						}
 						
@@ -1690,7 +1696,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 						if (item == 0) return 0;
 
 						if (item->type != NOOMP_NODE_INDEX && item->type != NOOMP_NODE_GETFIELD && item->type != NOOMP_NODE_VARIABLE) {
-							parser->error_state = NOOMP_ERROR_UNEXPECTED;
+							parser->error_state = NOOMP_ERROR_NOT_ASSIGNABLE;
 							return 0; // unexpected
 						}
 
@@ -1709,7 +1715,7 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 						break;
 					}
 				} else {
-					parser->error_state = NOOMP_ERROR_UNEXPECTED;
+					parser->error_state = NOOMP_ERROR_EXPECTED_COMMA_OR_EQUAL_IN_ASSIGNMENT;
 					return 0; // unexpected
 				}
 			}
@@ -1738,12 +1744,12 @@ noomP_Node* noomP_parseRawStatement(noomP_Parser* parser) {
 			// this expression is now a statement.
 			return base; // no need to eat any more.
 		} else {
-			parser->error_state = NOOMP_ERROR_UNEXPECTED;
+			parser->error_state = NOOMP_ERROR_EXPRESSION_NOT_STATEMENT;
 			return 0; // unexpected. e.g. random string or whatever
 		}
 	}
 
-	parser->error_state = NOOMP_ERROR_UNEXPECTED;
+	parser->error_state = NOOMP_ERROR_INVALID_STATEMENT;
 	return 0;
 }
 
@@ -1767,29 +1773,27 @@ noomP_Node* noomP_parseStatement(noomP_Parser* parser) {
 	return stmt;
 }
 
-int noomP_parse(const char* code, const char* filename, noom_LuaVersion version, noomP_Node** outpointer, noomP_Node** last_node) {
+int noomP_parse(const char* code, const char* filename, noom_LuaVersion version, noomP_Node** outpointer, noomP_Parser* parser) {
-	noomP_Parser parser;
+	noomP_initParser(parser, code, filename, version);
-	noomP_initParser(&parser, code, filename, version);
 
 	noomL_Token token;
-	noomP_Node* node = noomP_allocNode(&parser);
+	noomP_Node* node = noomP_allocNode(parser);
 	if (node == 0) return -1;
 
-	node->source_offset = parser.lex_offset;
+	node->source_offset = parser->lex_offset;
 	node->type = NOOMP_NODE_PROGRAM;
 
 	while (1) {
-		if (noomP_peek(&parser, &token)) return 0;
+		if (noomP_peek(parser, &token)) return 0;
 		if (token.type == NOOML_TOKEN_EOF) break;
 
-		noomP_Node* child = noomP_parseStatement(&parser);
+		noomP_Node* child = noomP_parseStatement(parser);
 		if (child == 0) return -1;
 
-		if (noomP_addSubnode(&parser, node, child)) return 0;
+		if (noomP_addSubnode(parser, node, child)) return 0;
 	}
 
 	*outpointer = node;
-	*last_node = parser.last_node;
 
 	return 0;
 }
@@ -1798,6 +1802,7 @@ int noomP_initParser(noomP_Parser* parser, const char* code, const char* filenam
 	parser->code = code;
 	parser->filename = filename;
 	parser->lex_offset = 0;
+	parser->last_token_length = 0;
 	parser->last_node = (void *)0;
 	parser->version = version;
 

src/parser.h

@@ -72,12 +72,57 @@ typedef enum noomP_Error {
 	NOOMP_ERROR_NONE = 0,
 	NOOMP_ERROR_OOM,
 
-	NOOMP_ERROR_UNEXPECTED, // TODO: maybe split into multiple for better errors?
+	NOOMP_ERROR_EXPECTED_LCURLY, // table start
+	NOOMP_ERROR_EXPECTED_RCURLY, // table end
+	NOOMP_ERROR_EXPECTED_RBRACKET_AFTER_KEY,
+	NOOMP_ERROR_EXPECTED_EQUALS_AFTER_KEY,
+
+	NOOMP_ERROR_EXPECTED_FIELD_IDENTIFIER,
+	NOOMP_ERROR_EXPECTED_METHOD_CALL,
+	NOOMP_ERROR_EXPECTED_RBRACKET_AFTER_INDEX,
+
+	NOOMP_ERROR_EXPECTED_RPAREN_AFTER_EXPRESSION,
+
+	NOOMP_ERROR_EXPECTED_LPAREN_FOR_PARAMETERS,
+	NOOMP_ERROR_EXPECTED_RPAREN_FOR_PARAMETERS,
+
+	NOOMP_ERROR_EXPECTED_IDENTIFIER_AFTER_LOCAL_FUNCTION,
+	NOOMP_ERROR_EXPECTED_IDENTIFIER_AFTER_FUNCTION,
+	NOOMP_ERROR_EXPECTED_END_AFTER_LOCAL_FUNCTION,
+	NOOMP_ERROR_EXPECTED_END_AFTER_FUNCTION,
+
+	NOOMP_ERROR_EXPECTED_IDENTIFIER_AFTER_LOCAL,
+
+	NOOMP_ERROR_EXPECTED_IDENTIFIER_AFTER_LANGLE,
+	NOOMP_ERROR_EXPECTED_RANGLE_TO_CLOSE_ATTRIBUTE,
+
+	NOOMP_ERROR_EXPECTED_THEN_AFTER_EXPRESSION,
+	NOOMP_ERROR_EXPECTED_ELSE_ELSEIF_OR_END,
+	NOOMP_ERROR_EXPECTED_END_AFTER_IF,
+	NOOMP_ERROR_EXPECTED_DO_AFTER_EXPRESSION,
+	NOOMP_ERROR_EXPECTED_END_AFTER_WHILE,
+	NOOMP_ERROR_EXPECTED_END_AFTER_FOR,
+	NOOMP_ERROR_EXPECTED_END_AFTER_DO,
+	NOOMP_ERROR_EXPECTED_IDENTIFIER_AFTER_FOR,
+	NOOMP_ERROR_EXPECTED_VARIABLE_AFTER_COMMA_IN_FOR,
+	NOOMP_ERROR_EXPECTED_IN,
+	NOOMP_ERROR_EXPECTED_UNTIL,
+
+	NOOMP_ERROR_EXPECTED_IDENTIFIER_AFTER_GOTO,
+	NOOMP_ERROR_EXPECTED_COLONCOLON,
+
+	NOOMP_ERROR_INVALID_STATEMENT,
+
+	NOOMP_ERROR_EXPECTED_ASSIGNABLE,
+	NOOMP_ERROR_NOT_ASSIGNABLE,
+	NOOMP_ERROR_EXPECTED_COMMA_OR_EQUAL_IN_ASSIGNMENT,
+	NOOMP_ERROR_EXPRESSION_NOT_STATEMENT,
+
 	NOOMP_ERROR_FAKEATTRIBUTE,
 	NOOMP_ERROR_RETURN_NOT_END,
 	NOOMP_ERROR_FOR_WRONG_AMOUNT,
 
-	NOOMP_ERROR_LEXER = 1 << 31, // bitwise or'd with the lexer error number
+	NOOMP_ERROR_LEXER = 1 << 31, // bitwise or's with the lexer error number
 } noomP_Error;
 
 typedef struct noomP_Node {
@@ -97,6 +142,9 @@ typedef struct noomP_Parser { // todo: track location in code with line/column?
 	
 	const char* code;
 	const char* filename;
+	noom_uint_t last_token_offset;
+	noom_uint_t last_token_length;
+
 	noom_uint_t lex_offset;
 
 	noom_uint_t error_state;
@@ -117,7 +165,7 @@ noomP_Node* noomP_parseBlock(noomP_Parser* parser);
 noomP_Node* noomP_parseExpression(noomP_Parser* parser);
 noomP_Node* noomP_parseStatement(noomP_Parser* parser);
 
-int noomP_parse(const char* code, const char* filename, noom_LuaVersion version, noomP_Node** outpointer, noomP_Node** last_node);
+int noomP_parse(const char* code, const char* filename, noom_LuaVersion version, noomP_Node** outpointer, noomP_Parser* parser);
 
 int noomP_initParser(noomP_Parser* parser, const char* code, const char* filename, noom_LuaVersion version);
 

src/vm.c

@@ -0,0 +1,42 @@
+#include "vm.h"
+#include "helper.h"
+
+noomV_Object *noomV_allocObj(noom_LuaVM *vm, noomV_ObjTag tag, noom_uint_t size) {
+	noomV_Object *o = noom_alloc(size);
+	if(o == 0) return o;
+
+	o->tag = tag;
+	o->marked = 0;
+	o->next = vm->heap;
+	o->nextGray = 0;
+	vm->heap = o;
+	return o;
+}
+
+void noomV_freeObj(noomV_Object *obj) {
+	noom_free(obj);
+}
+
+noom_LuaVM *noom_createVM(noom_LuaVersion version) {
+	noom_LuaVM *vm = noom_alloc(sizeof(*vm));
+	if(vm == 0) return 0;
+	// initialize the universe to NULL, handles partial OOMs nicely
+	vm->heap = 0;
+	vm->graySet = 0;
+	vm->globals = 0;
+	vm->registry = 0;
+	vm->mainThread = 0;
+	vm->currentThread = 0;
+	vm->version = version;
+	return vm;
+}
+
+void noom_destroyVM(noom_LuaVM *vm) {
+	noomV_Object *iter = vm->heap;
+	while(iter) {
+		noomV_Object *cur = iter;
+		iter = iter->next;
+		noomV_freeObj(cur);
+	}
+	noom_free(vm);
+}

src/vm.h

@@ -25,7 +25,7 @@ typedef enum noomV_ObjTag {
 
 typedef struct noomV_Object {
 	noomV_ObjTag tag;
-	bool marked;
+	noom_bool_t marked;
 	struct noomV_Object *next;
 	struct noomV_Object *nextGray;
 } noomV_Object;
@@ -43,14 +43,15 @@ typedef enum noomV_ValueTag : unsigned char {
 typedef struct noomV_Value {
 	noomV_ValueTag tag;
 	// for stack slots
-	bool autoclose;
+	noom_bool_t autoclose;
 	// pointer to value
-	bool isptr;
+	noom_bool_t isptr;
 	union {
 		noom_bool_t boolean;
 		noom_int_t integer;
 		noom_float_t number;
 		noomV_Object *obj;
+		struct noomV_Pointer *ptr;
 	};
 } noomV_Value;
 
@@ -64,8 +65,15 @@ typedef struct noomV_String {
 typedef struct noomV_Table {
 	noomV_Object obj;
 	struct noomV_Table *meta;
+	// amount of entries allocated
 	noom_uint_t entries;
+	// how many entries are defined.
+	// Note, this includes keys with null values, which are still scanned.
+	noom_uint_t used;
+	// cache of #t, for faster subsequent fetches
 	noom_uint_t len;
+	// actual values. Given index i, V[i] is the key and V[i+entries] is the value.
+	// This is because we mostly read the key, so we should put more keys in cache.
 	noomV_Value *entrydata;
 } noomV_Table;
 
@@ -166,6 +174,7 @@ typedef struct noomV_Inst {
 typedef struct noomV_UpvalDesc {
 	char *name;
 	unsigned char idx;
+	// whether the index is a stack index
 	noom_bool_t isStack;
 } noomV_UpvalDesc;
 
@@ -184,11 +193,13 @@ typedef struct noomV_Function {
 	noomV_String *chunkname;
 	noomV_Inst *code;
 	noomV_Value *consts;
-	noomV_Function **protos;
+	struct noomV_Function **protos;
 	noomV_UpvalDesc *upvals;
 	noomV_LocalDesc *locals;
 	unsigned int codesize;
+	// line of function
 	unsigned int linedefined;
+	// line of end
 	unsigned int lastlinedefined;
 	// very size limited
 	//       ░░░░░░░░░                                                         ░ ▒░░▒    ▒░   ░░  ░       
@@ -260,7 +271,7 @@ typedef struct noomV_Function {
 typedef struct noomV_CallFrame {
 	// stack index of function
 	unsigned int funcIdx;
-	bool isC;
+	noom_bool_t isC;
 	union {
 		struct {
 			// 
@@ -293,6 +304,11 @@ struct noom_LuaVM {
 	noomV_Table *registry;
 	noomV_Thread *mainThread;
 	noomV_Thread *currentThread;
+	noom_LuaVersion version;
 };
 
+// Allocating objects
+noomV_Object *noomV_allocObj(noom_LuaVM *vm, noomV_ObjTag tag, noom_uint_t size);
+void noomV_freeObj(noomV_Object *obj);
+
 #endif