Factoring out variable parsing so it can be used for locals too

This commit is contained in:
Wolfgang Bumiller 2012-07-19 20:15:30 +02:00
parent 4360d3b5be
commit c43bb71aa7

327
parser.c
View file

@ -12,9 +12,12 @@ typedef struct {
MEM_VECTOR_MAKE(ast_function*, functions);
ast_function *function;
MEM_VECTOR_MAKE(ast_value*, locals);
size_t blocklocal;
} parser_t;
MEM_VEC_FUNCTIONS(parser_t, ast_value*, globals)
MEM_VEC_FUNCTIONS(parser_t, ast_value*, locals)
MEM_VEC_FUNCTIONS(parser_t, ast_function*, functions)
void parseerror(parser_t *parser, const char *fmt, ...)
@ -64,6 +67,25 @@ ast_value* parser_find_global(parser_t *parser, const char *name)
return NULL;
}
ast_value* parser_find_local(parser_t *parser, const char *name, size_t upto)
{
size_t i;
for (i = parser->locals_count; i > upto;) {
--i;
if (!strcmp(parser->locals[i]->name, name))
return parser->locals[i];
}
return NULL;
}
ast_value* parser_find_var(parser_t *parser, const char *name)
{
ast_value *v;
v = parser_find_local(parser, name, 0);
if (!v) v = parser_find_global(parser, name);
return v;
}
typedef struct {
MEM_VECTOR_MAKE(ast_value*, p);
} paramlist_t;
@ -134,131 +156,199 @@ ast_value *parser_parse_type(parser_t *parser, bool *isfunc)
return var;
}
bool parser_parse_body(parser_t *parser)
bool parser_body_do(parser_t *parser, ast_block *block)
{
if (parser->tok == TOKEN_TYPENAME)
{
/* local variable */
}
else if (parser->tok == '{')
{
/* a block */
}
parseerror(parser, "expected statement");
return false;
}
ast_block* parser_parse_block(parser_t *parser)
{
ast_block *block;
if (!parser_next(parser)) { /* skip the '{' */
parseerror(parser, "expected function body");
return NULL;
}
block = ast_block_new(parser_ctx(parser));
while (parser->tok != TOKEN_EOF && parser->tok < TOKEN_ERROR)
{
if (parser->tok == '}')
break;
if (!parser_body_do(parser, block)) {
ast_block_delete(block);
return NULL;
}
}
return block;
}
bool parser_variable(parser_t *parser, bool global)
{
bool isfunc = false;
ast_function *func = NULL;
lex_ctx ctx = parser_ctx(parser);
ast_value *var = parser_parse_type(parser, &isfunc);
if (!var)
return false;
if (parser->tok != TOKEN_IDENT) {
parseerror(parser, "expected variable name\n");
return false;
}
if (global && parser_find_global(parser, parser_tokval(parser))) {
ast_value_delete(var);
parseerror(parser, "global already exists: %s\n", parser_tokval(parser));
return false;
}
if (!global && parser_find_local(parser, parser_tokval(parser), parser->blocklocal)) {
ast_value_delete(var);
parseerror(parser, "local variable already exists: %s\n", parser_tokval(parser));
return false;
}
if (!ast_value_set_name(var, parser_tokval(parser))) {
parseerror(parser, "failed to set variable name\n");
ast_value_delete(var);
return false;
}
if (isfunc) {
/* a function was defined */
ast_value *fval;
/* turn var into a value of TYPE_FUNCTION, with the old var
* as return type
*/
fval = ast_value_new(ctx, var->name, TYPE_FUNCTION);
func = ast_function_new(ctx, var->name, fval);
if (!fval || !func) {
ast_value_delete(var);
if (fval) ast_value_delete(fval);
if (func) ast_function_delete(func);
return false;
}
fval->expression.next = (ast_expression*)var;
MEM_VECTOR_MOVE(var, params, fval, params);
if (!parser_t_functions_add(parser, func)) {
ast_value_delete(var);
if (fval) ast_value_delete(fval);
if (func) ast_function_delete(func);
return false;
}
var = fval;
}
if ( ( global && !parser_t_globals_add(parser, var)) ||
(!global && !parser_t_locals_add(parser, var)) )
{
ast_value_delete(var);
return false;
}
if (!parser_next(parser)) {
ast_value_delete(var);
return false;
}
if (parser->tok == ';') {
if (!parser_next(parser))
return parser->tok == TOKEN_EOF;
return true;
}
if (parser->tok != '=') {
parseerror(parser, "expected '=' or ';'");
return false;
}
if (!parser_next(parser))
return false;
if (parser->tok == '#') {
if (!global) {
parseerror(parser, "cannot declare builtins within functions");
return false;
}
if (!isfunc || !func) {
parseerror(parser, "unexpected builtin number, '%s' is not a function", var->name);
return false;
}
if (!parser_next(parser)) {
parseerror(parser, "expected builtin number");
return false;
}
if (parser->tok != TOKEN_INTCONST) {
parseerror(parser, "builtin number must be an integer constant");
return false;
}
if (parser_token(parser)->constval.i <= 0) {
parseerror(parser, "builtin number must be positive integer greater than zero");
return false;
}
func->builtin = -parser_token(parser)->constval.i;
} else if (parser->tok == '{') {
/* function body */
ast_block *block;
ast_function *old = parser->function;
if (!global) {
parseerror(parser, "cannot declare functions within functions");
return false;
}
parser->function = func;
block = parser_parse_block(parser);
parser->function = old;
if (!block)
return false;
if (!ast_function_blocks_add(func, block)) {
ast_block_delete(block);
return false;
}
return true;
} else {
parseerror(parser, "TODO, const assignment");
}
if (!parser_next(parser))
return false;
if (parser->tok != ';') {
parseerror(parser, "expected semicolon");
return false;
}
(void)parser_next(parser);
return true;
}
bool parser_do(parser_t *parser)
{
if (parser->tok == TOKEN_TYPENAME)
{
bool isfunc = false;
ast_function *func = NULL;
lex_ctx ctx = parser_ctx(parser);
ast_value *var = parser_parse_type(parser, &isfunc);
if (!var)
return false;
if (parser->tok != TOKEN_IDENT) {
parseerror(parser, "expected variable name\n");
return false;
}
if (parser_find_global(parser, parser_tokval(parser))) {
ast_value_delete(var);
parseerror(parser, "global already exists: %s\n", parser_tokval(parser));
return false;
}
if (!ast_value_set_name(var, parser_tokval(parser))) {
parseerror(parser, "failed to set variable name\n");
ast_value_delete(var);
return false;
}
if (isfunc) {
/* a function was defined */
ast_value *fval;
/* turn var into a value of TYPE_FUNCTION, with the old var
* as return type
*/
fval = ast_value_new(ctx, var->name, TYPE_FUNCTION);
func = ast_function_new(ctx, var->name, fval);
if (!fval || !func) {
ast_value_delete(var);
if (fval) ast_value_delete(fval);
if (func) ast_function_delete(func);
return false;
}
fval->expression.next = (ast_expression*)var;
MEM_VECTOR_MOVE(var, params, fval, params);
if (!parser_t_functions_add(parser, func)) {
ast_value_delete(var);
if (fval) ast_value_delete(fval);
if (func) ast_function_delete(func);
return false;
}
var = fval;
}
if (!parser_t_globals_add(parser, var) ||
!parser_next(parser))
{
ast_value_delete(var);
return false;
}
if (parser->tok == ';') {
if (!parser_next(parser))
return parser->tok == TOKEN_EOF;
return true;
}
if (parser->tok != '=') {
parseerror(parser, "expected '=' or ';'");
return false;
}
if (!parser_next(parser))
return false;
if (parser->tok == '#') {
if (!isfunc || !func) {
parseerror(parser, "unexpected builtin number, '%s' is not a function", var->name);
return false;
}
if (!parser_next(parser)) {
parseerror(parser, "expected builtin number");
return false;
}
if (parser->tok != TOKEN_INTCONST) {
parseerror(parser, "builtin number must be an integer constant");
return false;
}
if (parser_token(parser)->constval.i <= 0) {
parseerror(parser, "builtin number must be positive integer greater than zero");
return false;
}
func->builtin = -parser_token(parser)->constval.i;
} else if (parser->tok == '{') {
/* function body */
bool ret;
ast_function *old = parser->function;
parser->function = func;
ret = parser_parse_body(parser);
parser->function = old;
return ret;
} else {
parseerror(parser, "TODO, const assignment");
}
if (!parser_next(parser))
return false;
if (parser->tok != ';') {
parseerror(parser, "expected semicolon");
return false;
}
(void)parser_next(parser);
return true;
return parser_variable(parser, true);
}
else if (parser->tok == TOKEN_KEYWORD)
{
@ -288,9 +378,10 @@ bool parser_compile(const char *filename)
if (!parser)
return false;
memset(&parser, 0, sizeof(parser));
memset(parser, 0, sizeof(parser));
MEM_VECTOR_INIT(parser, globals);
MEM_VECTOR_INIT(parser, locals);
parser->lex = lex_open(filename);
if (!parser->lex) {