qse/ase/stx/parser.c

1609 lines
40 KiB
C

/*
* $Id: parser.c,v 1.78 2005-10-02 15:45:09 bacon Exp $
*/
#include <xp/stx/parser.h>
#include <xp/stx/object.h>
#include <xp/stx/class.h>
#include <xp/stx/method.h>
#include <xp/stx/symbol.h>
#include <xp/stx/bytecode.h>
#include <xp/stx/dict.h>
#include <xp/stx/misc.h>
static int __parse_method (
xp_stx_parser_t* parser,
xp_word_t method_class, void* input);
static int __finish_method (xp_stx_parser_t* parser);
static int __parse_message_pattern (xp_stx_parser_t* parser);
static int __parse_unary_pattern (xp_stx_parser_t* parser);
static int __parse_binary_pattern (xp_stx_parser_t* parser);
static int __parse_keyword_pattern (xp_stx_parser_t* parser);
static int __parse_temporaries (xp_stx_parser_t* parser);
static int __parse_primitive (xp_stx_parser_t* parser);
static int __parse_statements (xp_stx_parser_t* parser);
static int __parse_block_statements (xp_stx_parser_t* parser);
static int __parse_statement (xp_stx_parser_t* parser);
static int __parse_expression (xp_stx_parser_t* parser);
static int __parse_assignment (
xp_stx_parser_t* parser, const xp_char_t* target);
static int __parse_basic_expression (
xp_stx_parser_t* parser, const xp_char_t* ident);
static int __parse_primary (
xp_stx_parser_t* parser, const xp_char_t* ident, xp_bool_t* is_super);
static int __parse_primary_ident (
xp_stx_parser_t* parser, const xp_char_t* ident, xp_bool_t* is_super);
static int __parse_block_constructor (xp_stx_parser_t* parser);
static int __parse_message_continuation (
xp_stx_parser_t* parser, xp_bool_t is_super);
static int __parse_keyword_message (
xp_stx_parser_t* parser, xp_bool_t is_super);
static int __parse_binary_message (
xp_stx_parser_t* parser, xp_bool_t is_super);
static int __parse_unary_message (
xp_stx_parser_t* parser, xp_bool_t is_super);
static int __get_token (xp_stx_parser_t* parser);
static int __get_ident (xp_stx_parser_t* parser);
static int __get_numlit (xp_stx_parser_t* parser, xp_bool_t negated);
static int __get_charlit (xp_stx_parser_t* parser);
static int __get_strlit (xp_stx_parser_t* parser);
static int __get_binary (xp_stx_parser_t* parser);
static int __skip_spaces (xp_stx_parser_t* parser);
static int __skip_comment (xp_stx_parser_t* parser);
static int __get_char (xp_stx_parser_t* parser);
static int __unget_char (xp_stx_parser_t* parser, xp_cint_t c);
static int __open_input (xp_stx_parser_t* parser, void* input);
static int __close_input (xp_stx_parser_t* parser);
xp_stx_parser_t* xp_stx_parser_open (xp_stx_parser_t* parser, xp_stx_t* stx)
{
if (parser == XP_NULL) {
parser = (xp_stx_parser_t*)
xp_malloc (xp_sizeof(xp_stx_parser_t));
if (parser == XP_NULL) return XP_NULL;
parser->__malloced = xp_true;
}
else parser->__malloced = xp_false;
if (xp_stx_name_open (&parser->method_name, 0) == XP_NULL) {
if (parser->__malloced) xp_free (parser);
return XP_NULL;
}
if (xp_stx_token_open (&parser->token, 0) == XP_NULL) {
xp_stx_name_close (&parser->method_name);
if (parser->__malloced) xp_free (parser);
return XP_NULL;
}
if (xp_array_open (
&parser->bytecode, 256,
xp_sizeof(xp_byte_t), XP_NULL) == XP_NULL) {
xp_stx_name_close (&parser->method_name);
xp_stx_token_close (&parser->token);
if (parser->__malloced) xp_free (parser);
return XP_NULL;
}
parser->stx = stx;
parser->error_code = XP_STX_PARSER_ERROR_NONE;
parser->temporary_count = 0;
parser->argument_count = 0;
parser->literal_count = 0;
parser->curc = XP_CHAR_EOF;
parser->ungotc_count = 0;
parser->input_owner = XP_NULL;
parser->input_func = XP_NULL;
return parser;
}
void xp_stx_parser_close (xp_stx_parser_t* parser)
{
while (parser->temporary_count > 0) {
xp_free (parser->temporaries[--parser->temporary_count]);
}
parser->argument_count = 0;
xp_array_close (&parser->bytecode);
xp_stx_name_close (&parser->method_name);
xp_stx_token_close (&parser->token);
if (parser->__malloced) xp_free (parser);
}
#define GET_CHAR(parser) \
do { if (__get_char(parser) == -1) return -1; } while (0)
#define UNGET_CHAR(parser,c) \
do { if (__unget_char(parser,c) == -1) return -1; } while (0)
#define GET_TOKEN(parser) \
do { if (__get_token(parser) == -1) return -1; } while (0)
#define ADD_TOKEN_CHAR(parser,c) \
do { \
if (xp_stx_token_addc (&(parser)->token, c) == -1) { \
(parser)->error_code = XP_STX_PARSER_ERROR_MEMORY; \
return -1; \
} \
} while (0)
const xp_char_t* xp_stx_parser_error_string (xp_stx_parser_t* parser)
{
static const xp_char_t* msg[] =
{
XP_TEXT("no error"),
XP_TEXT("input fucntion not ready"),
XP_TEXT("input function error"),
XP_TEXT("out of memory"),
XP_TEXT("invalid character"),
XP_TEXT("incomplete character literal"),
XP_TEXT("incomplete string literal"),
XP_TEXT("incomplete literal"),
XP_TEXT("message selector"),
XP_TEXT("invalid argument name"),
XP_TEXT("too many arguments"),
XP_TEXT("invalid primitive type"),
XP_TEXT("primitive number expected"),
XP_TEXT("primitive number out of range"),
XP_TEXT("primitive not closed"),
XP_TEXT("temporary list not closed"),
XP_TEXT("too many temporaries"),
XP_TEXT("cannot redefine pseudo variable"),
XP_TEXT("invalid primary/expression-start"),
XP_TEXT("no period at end of statement"),
XP_TEXT("no closing parenthesis"),
XP_TEXT("block argument name missing"),
XP_TEXT("block argument list not closed"),
XP_TEXT("block not closed"),
XP_TEXT("undeclared name"),
XP_TEXT("too many literals")
};
if (parser->error_code >= 0 &&
parser->error_code < xp_countof(msg)) return msg[parser->error_code];
return XP_TEXT("unknown error");
}
static INLINE xp_bool_t __is_pseudo_variable (const xp_stx_token_t* token)
{
return token->type == XP_STX_TOKEN_IDENT &&
(xp_strcmp(token->name.buffer, XP_TEXT("self")) == 0 ||
xp_strcmp(token->name.buffer, XP_TEXT("super")) == 0 ||
xp_strcmp(token->name.buffer, XP_TEXT("nil")) == 0 ||
xp_strcmp(token->name.buffer, XP_TEXT("true")) == 0 ||
xp_strcmp(token->name.buffer, XP_TEXT("false")) == 0);
}
static INLINE xp_bool_t __is_vbar_token (const xp_stx_token_t* token)
{
return
token->type == XP_STX_TOKEN_BINARY &&
token->name.size == 1 &&
token->name.buffer[0] == XP_CHAR('|');
}
static INLINE xp_bool_t __is_primitive_opener (const xp_stx_token_t* token)
{
return
token->type == XP_STX_TOKEN_BINARY &&
token->name.size == 1 &&
token->name.buffer[0] == XP_CHAR('<');
}
static INLINE xp_bool_t __is_primitive_closer (const xp_stx_token_t* token)
{
return
token->type == XP_STX_TOKEN_BINARY &&
token->name.size == 1 &&
token->name.buffer[0] == XP_CHAR('>');
}
static INLINE xp_bool_t __is_binary_char (xp_cint_t c)
{
/*
* binaryCharacter ::=
* '!' | '%' | '&' | '*' | '+' | ',' |
* '/' | '<' | '=' | '>' | '?' | '@' |
* '\' | '~' | '|' | '-'
*/
return
c == XP_CHAR('!') || c == XP_CHAR('%') ||
c == XP_CHAR('&') || c == XP_CHAR('*') ||
c == XP_CHAR('+') || c == XP_CHAR(',') ||
c == XP_CHAR('/') || c == XP_CHAR('<') ||
c == XP_CHAR('=') || c == XP_CHAR('>') ||
c == XP_CHAR('?') || c == XP_CHAR('@') ||
c == XP_CHAR('\\') || c == XP_CHAR('|') ||
c == XP_CHAR('~') || c == XP_CHAR('-');
}
static INLINE xp_bool_t __is_closing_char (xp_cint_t c)
{
return
c == XP_CHAR('.') || c == XP_CHAR(']') ||
c == XP_CHAR(')') || c == XP_CHAR(';') ||
c == XP_CHAR('\"') || c == XP_CHAR('\'');
}
#define EMIT_CODE_TEST(parser,high,low) \
do { if (__emit_code_test(parser,high,low) == -1) return -1; } while (0)
#define EMIT_CODE(parser,code) \
do { if (__emit_code(parser,code) == -1) return -1; } while(0)
#define EMIT_PUSH_RECEIVER_VARIABLE(parser,pos) \
do { \
if (__emit_stack_positional ( \
parser, PUSH_RECEIVER_VARIABLE, pos) == -1) return -1; \
} while (0)
#define EMIT_PUSH_TEMPORARY_LOCATION(parser,pos) \
do { \
if (__emit_stack_positional ( \
parser, PUSH_TEMPORARY_LOCATION, pos) == -1) return -1; \
} while (0)
#define EMIT_PUSH_LITERAL_CONSTANT(parser,pos) \
do { \
if (__emit_stack_positional ( \
parser, PUSH_LITERAL_CONSTANT, pos) == -1) return -1; \
} while (0)
#define EMIT_PUSH_LITERAL_VARIABLE(parser,pos) \
do { \
if (__emit_stack_positional ( \
parser, PUSH_LITERAL_VARIABLE, pos) == -1) return -1; \
} while (0)
#define EMIT_STORE_RECEIVER_VARIABLE(parser,pos) \
do { \
if (__emit_stack_positional ( \
parser, STORE_RECEIVER_VARIABLE, pos) == -1) return -1; \
} while (0)
#define EMIT_STORE_TEMPORARY_LOCATION(parser,pos) \
do { \
if (__emit_stack_positional ( \
parser, STORE_TEMPORARY_LOCATION, pos) == -1) return -1; \
} while (0)
#define EMIT_POP_STACK_TOP(parser) EMIT_CODE(parser, POP_STACK_TOP)
#define EMIT_DUPLICATE_STACK_TOP(parser) EMIT_CODE(parser, DUPLICATE_STACK_TOP)
#define EMIT_PUSH_ACTIVE_CONTEXT(parser) EMIT_CODE(parser, PUSH_ACTIVE_CONTEXT)
#define EMIT_RETURN_FROM_MESSAGE(parser) EMIT_CODE(parser, RETURN_FROM_MESSAGE)
#define EMIT_RETURN_FROM_BLOCK(parser) EMIT_CODE(parser, RETURN_FROM_BLOCK)
#define EMIT_SEND_TO_SELF(parser,nargs,selector) \
do { \
if (__emit_send_to_self(parser,nargs,selector) == -1) return -1; \
} while (0)
#define EMIT_SEND_TO_SUPER(parser,nargs,selector) \
do { \
if (__emit_send_to_super(parser,nargs,selector) == -1) return -1; \
} while (0)
#define EMIT_DO_PRIMITIVE(parser,no) \
do { if (__emit_do_primitive(parser,no) == -1) return -1; } while(0)
static INLINE int __emit_code_test (
xp_stx_parser_t* parser, const xp_char_t* high, const xp_char_t* low)
{
xp_printf (XP_TEXT("CODE: %s %s\n"), high, low);
return 0;
}
static INLINE int __emit_code (xp_stx_parser_t* parser, xp_byte_t code)
{
if (xp_array_add_datum(&parser->bytecode, &code) == XP_NULL) {
parser->error_code = XP_STX_PARSER_ERROR_MEMORY;
return -1;
}
return 0;
}
static INLINE int __emit_stack_positional (
xp_stx_parser_t* parser, int opcode, int pos)
{
xp_assert (pos >= 0x0 && pos <= 0xFF);
if (pos <= 0x0F) {
EMIT_CODE (parser, (opcode & 0xF0) | (pos & 0x0F));
}
else {
EMIT_CODE (parser, (opcode >> 4) & 0x6F);
EMIT_CODE (parser, pos & 0xFF);
}
return 0;
}
static INLINE int __emit_send_to_self (
xp_stx_parser_t* parser, int nargs, int selector)
{
xp_assert (nargs >= 0x00 && nargs <= 0xFF);
xp_assert (selector >= 0x00 && selector <= 0xFF);
if (nargs <= 0x08 && selector <= 0x1F) {
EMIT_CODE (parser, SEND_TO_SELF);
EMIT_CODE (parser, (nargs << 5) | selector);
}
else {
EMIT_CODE (parser, SEND_TO_SELF_EXTENDED);
EMIT_CODE (parser, nargs);
EMIT_CODE (parser, selector);
}
return 0;
}
static INLINE int __emit_send_to_super (
xp_stx_parser_t* parser, int nargs, int selector)
{
xp_assert (nargs >= 0x00 && nargs <= 0xFF);
xp_assert (selector >= 0x00 && selector <= 0xFF);
if (nargs <= 0x08 && selector <= 0x1F) {
EMIT_CODE (parser, SEND_TO_SUPER);
EMIT_CODE (parser, (nargs << 5) | selector);
}
else {
EMIT_CODE (parser, SEND_TO_SUPER_EXTENDED);
EMIT_CODE (parser, nargs);
EMIT_CODE (parser, selector);
}
return 0;
}
static INLINE int __emit_do_primitive (xp_stx_parser_t* parser, int no)
{
xp_assert (no >= 0x0 && no <= 0xFFF);
EMIT_CODE (parser, DO_PRIMITIVE | ((no >> 8) & 0x0F));
EMIT_CODE (parser, no & 0xFF);
return 0;
}
static int __add_literal (xp_stx_parser_t* parser, xp_word_t literal)
{
xp_word_t i;
for (i = 0; i < parser->literal_count; i++) {
/*
* it would remove redundancy of symbols and small integers.
* more complex redundacy check may be done somewhere else
* like in __add_string_literal.
*/
if (parser->literals[i] == literal) return i;
}
if (parser->literal_count >= xp_countof(parser->literals)) {
parser->error_code = XP_STX_PARSER_ERROR_TOO_MANY_LITERALS;
return -1;
}
parser->literals[parser->literal_count++] = literal;
return parser->literal_count - 1;
}
static int __add_character_literal (xp_stx_parser_t* parser, xp_char_t ch)
{
xp_word_t i, c, literal;
xp_stx_t* stx = parser->stx;
for (i = 0; i < parser->literal_count; i++) {
c = XP_STX_IS_SMALLINT(parser->literals[i])?
stx->class_smallinteger: XP_STX_CLASS (stx, parser->literals[i]);
if (c != stx->class_character) continue;
if (ch == XP_STX_CHAR_AT(stx,parser->literals[i],0)) return i;
}
literal = xp_stx_instantiate (
stx, stx->class_character, &ch, XP_NULL, 0);
return __add_literal (parser, literal);
}
static int __add_string_literal (
xp_stx_parser_t* parser, const xp_char_t* str, xp_word_t size)
{
xp_word_t i, c, literal;
xp_stx_t* stx = parser->stx;
for (i = 0; i < parser->literal_count; i++) {
c = XP_STX_IS_SMALLINT(parser->literals[i])?
stx->class_smallinteger: XP_STX_CLASS (stx, parser->literals[i]);
if (c != stx->class_string) continue;
if (xp_strxncmp (str, size,
XP_STX_DATA(stx,parser->literals[i]),
XP_STX_SIZE(stx,parser->literals[i])) == 0) return i;
}
literal = xp_stx_instantiate (
stx, stx->class_string, XP_NULL, str, size);
return __add_literal (parser, literal);
}
static int __add_symbol_literal (
xp_stx_parser_t* parser, const xp_char_t* str, xp_word_t size)
{
xp_stx_t* stx = parser->stx;
return __add_literal (parser, xp_stx_new_symbolx(stx, str, size));
}
int xp_stx_parser_parse_method (
xp_stx_parser_t* parser, xp_word_t method_class, void* input)
{
int n;
if (parser->input_func == XP_NULL) {
parser->error_code = XP_STX_PARSER_ERROR_INPUT_FUNC;
return -1;
}
parser->method_class = method_class;
if (__open_input(parser, input) == -1) return -1;
n = __parse_method (parser, method_class, input);
if (__close_input(parser) == -1) return -1;
return n;
}
static int __parse_method (
xp_stx_parser_t* parser, xp_word_t method_class, void* input)
{
/*
* <method definition> ::=
* <message pattern> [<temporaries>] [<primitive>] [<statements>]
*/
GET_CHAR (parser);
GET_TOKEN (parser);
xp_stx_name_clear (&parser->method_name);
xp_array_clear (&parser->bytecode);
while (parser->temporary_count > 0) {
xp_free (parser->temporaries[--parser->temporary_count]);
}
parser->argument_count = 0;
parser->literal_count = 0;
if (__parse_message_pattern(parser) == -1) return -1;
if (__parse_temporaries(parser) == -1) return -1;
if (__parse_primitive(parser) == -1) return -1;
if (__parse_statements(parser) == -1) return -1;
if (__finish_method (parser) == -1) return -1;
return 0;
}
static int __finish_method (xp_stx_parser_t* parser)
{
xp_stx_t* stx = parser->stx;
xp_stx_class_t* class_obj;
xp_stx_method_t* method_obj;
xp_word_t method, selector;
xp_assert (parser->bytecode.size != 0);
class_obj = (xp_stx_class_t*)
XP_STX_OBJECT(stx, parser->method_class);
if (class_obj->methods == stx->nil) {
/* TODO: reconfigure method dictionary size */
class_obj->methods = xp_stx_instantiate (
stx, stx->class_system_dictionary,
XP_NULL, XP_NULL, 64);
}
xp_assert (class_obj->methods != stx->nil);
selector = xp_stx_new_symbolx (
stx, parser->method_name.buffer, parser->method_name.size);
method = xp_stx_instantiate(stx, stx->class_method,
XP_NULL, parser->literals, parser->literal_count);
method_obj = (xp_stx_method_t*)XP_STX_OBJECT(stx, method);
/* TODO: text saving must be optional */
/*method_obj->text = xp_stx_instantiate (
stx, stx->class_string, XP_NULL,
parser->text, xp_strlen(parser->text));
*/
method_obj->selector = selector;
method_obj->bytecodes = xp_stx_instantiate (
stx, stx->class_bytearray, XP_NULL,
parser->bytecode.buffer, parser->bytecode.size);
/* TODO: better way to store argument count & temporary count */
method_obj->tmpcount =
XP_STX_TO_SMALLINT(parser->temporary_count - parser->argument_count);
method_obj->argcount = XP_STX_TO_SMALLINT(parser->argument_count);
xp_stx_dict_put (stx, class_obj->methods, selector, method);
return 0;
}
static int __parse_message_pattern (xp_stx_parser_t* parser)
{
/*
* <message pattern> ::=
* <unary pattern> | <binary pattern> | <keyword pattern>
* <unary pattern> ::= unarySelector
* <binary pattern> ::= binarySelector <method argument>
* <keyword pattern> ::= (keyword <method argument>)+
*/
int n;
if (parser->token.type == XP_STX_TOKEN_IDENT) {
n = __parse_unary_pattern (parser);
}
else if (parser->token.type == XP_STX_TOKEN_BINARY) {
n = __parse_binary_pattern (parser);
}
else if (parser->token.type == XP_STX_TOKEN_KEYWORD) {
n = __parse_keyword_pattern (parser);
}
else {
parser->error_code = XP_STX_PARSER_ERROR_MESSAGE_SELECTOR;
n = -1;
}
parser->temporary_count = parser->argument_count;
return n;
}
static int __parse_unary_pattern (xp_stx_parser_t* parser)
{
/* TODO: check if the method name exists */
if (xp_stx_name_adds(
&parser->method_name, parser->token.name.buffer) == -1) {
parser->error_code = XP_STX_PARSER_ERROR_MEMORY;
return -1;
}
GET_TOKEN (parser);
return 0;
}
static int __parse_binary_pattern (xp_stx_parser_t* parser)
{
/* TODO: check if the method name exists */
if (xp_stx_name_adds(
&parser->method_name, parser->token.name.buffer) == -1) {
parser->error_code = XP_STX_PARSER_ERROR_MEMORY;
return -1;
}
GET_TOKEN (parser);
if (parser->token.type != XP_STX_TOKEN_IDENT) {
parser->error_code = XP_STX_PARSER_ERROR_ARGUMENT_NAME;
return -1;
}
if (parser->argument_count >= xp_countof(parser->temporaries)) {
parser->error_code = XP_STX_PARSER_ERROR_TOO_MANY_ARGUMENTS;
return -1;
}
/* TODO: check for duplicate entries...in instvars */
parser->temporaries[parser->argument_count] =
xp_stx_token_yield (&parser->token, 0);
if (parser->temporaries[parser->argument_count] == XP_NULL) {
parser->error_code = XP_STX_PARSER_ERROR_MEMORY;
return -1;
}
parser->argument_count++;
GET_TOKEN (parser);
return 0;
}
static int __parse_keyword_pattern (xp_stx_parser_t* parser)
{
do {
if (xp_stx_name_adds(
&parser->method_name, parser->token.name.buffer) == -1) {
parser->error_code = XP_STX_PARSER_ERROR_MEMORY;
return -1;
}
GET_TOKEN (parser);
if (parser->token.type != XP_STX_TOKEN_IDENT) {
parser->error_code = XP_STX_PARSER_ERROR_ARGUMENT_NAME;
return -1;
}
if (__is_pseudo_variable(&parser->token)) {
parser->error_code = XP_STX_PARSER_ERROR_PSEUDO_VARIABLE;
return -1;
}
if (parser->argument_count >= xp_countof(parser->temporaries)) {
parser->error_code = XP_STX_PARSER_ERROR_TOO_MANY_ARGUMENTS;
return -1;
}
parser->temporaries[parser->argument_count] =
xp_stx_token_yield (&parser->token, 0);
if (parser->temporaries[parser->argument_count] == XP_NULL) {
parser->error_code = XP_STX_PARSER_ERROR_MEMORY;
return -1;
}
/* TODO: check for duplicate entries...in instvars/arguments */
parser->argument_count++;
GET_TOKEN (parser);
} while (parser->token.type == XP_STX_TOKEN_KEYWORD);
/* TODO: check if the method name exists */
/* if it exists, collapse arguments */
xp_printf (XP_TEXT("METHOD NAME ==> [%s]\n"), parser->method_name.buffer);
return 0;
}
static int __parse_temporaries (xp_stx_parser_t* parser)
{
/*
* <temporaries> ::= '|' <temporary variable list> '|'
* <temporary variable list> ::= identifier*
*/
if (!__is_vbar_token(&parser->token)) return 0;
GET_TOKEN (parser);
while (parser->token.type == XP_STX_TOKEN_IDENT) {
if (parser->temporary_count >= xp_countof(parser->temporaries)) {
parser->error_code = XP_STX_PARSER_ERROR_TOO_MANY_TEMPORARIES;
return -1;
}
if (__is_pseudo_variable(&parser->token)) {
parser->error_code = XP_STX_PARSER_ERROR_PSEUDO_VARIABLE;
return -1;
}
parser->temporaries[parser->temporary_count] =
xp_stx_token_yield (&parser->token, 0);
if (parser->temporaries[parser->temporary_count] == XP_NULL) {
parser->error_code = XP_STX_PARSER_ERROR_MEMORY;
return -1;
}
/* TODO: check for duplicate entries...in instvars/arguments/temporaries */
parser->temporary_count++;
GET_TOKEN (parser);
}
if (!__is_vbar_token(&parser->token)) {
parser->error_code = XP_STX_PARSER_ERROR_TEMPORARIES_NOT_CLOSED;
return -1;
}
GET_TOKEN (parser);
return 0;
}
static int __parse_primitive (xp_stx_parser_t* parser)
{
/*
* <primitive> ::= '<' 'primitive:' number '>'
*/
int prim_no;
if (!__is_primitive_opener(&parser->token)) return 0;
GET_TOKEN (parser);
if (parser->token.type != XP_STX_TOKEN_KEYWORD ||
xp_strcmp (parser->token.name.buffer, XP_TEXT("primitive:")) != 0) {
parser->error_code = XP_STX_PARSER_ERROR_PRIMITIVE_KEYWORD;
return -1;
}
GET_TOKEN (parser); /* TODO: only integer */
if (parser->token.type != XP_STX_TOKEN_NUMLIT) {
parser->error_code = XP_STX_PARSER_ERROR_PRIMITIVE_NUMBER;
return -1;
}
/*TODO: more checks the validity of the primitive number */
if (!xp_stristype(parser->token.name.buffer, xp_isdigit)) {
parser->error_code = XP_STX_PARSER_ERROR_PRIMITIVE_NUMBER;
return -1;
}
XP_STRTOI (prim_no, parser->token.name.buffer, XP_NULL, 10);
if (prim_no < 0 || prim_no > 0xFF) {
parser->error_code = XP_STX_PARSER_ERROR_PRIMITIVE_NUMBER_RANGE;
return -1;
}
EMIT_DO_PRIMITIVE (parser, prim_no);
GET_TOKEN (parser);
if (!__is_primitive_closer(&parser->token)) {
parser->error_code = XP_STX_PARSER_ERROR_PRIMITIVE_NOT_CLOSED;
return -1;
}
GET_TOKEN (parser);
return 0;
}
static int __parse_statements (xp_stx_parser_t* parser)
{
/*
* <statements> ::= (ORIGINAL->maybe wrong)
* (<return statement> ['.'] ) |
* (<expression> ['.' [<statements>]])
* <statements> ::= (REVISED->correct?)
* <statement> ['. [<statements>]]
*/
while (parser->token.type != XP_STX_TOKEN_END) {
if (__parse_statement (parser) == -1) return -1;
if (parser->token.type == XP_STX_TOKEN_PERIOD) {
GET_TOKEN (parser);
continue;
}
if (parser->token.type != XP_STX_TOKEN_END) {
parser->error_code = XP_STX_PARSER_ERROR_NO_PERIOD;
return -1;
}
}
EMIT_CODE (parser, RETURN_RECEIVER);
return 0;
}
static int __parse_block_statements (xp_stx_parser_t* parser)
{
while (parser->token.type != XP_STX_TOKEN_RBRACKET &&
parser->token.type != XP_STX_TOKEN_END) {
if (__parse_statement(parser) == -1) return -1;
if (parser->token.type != XP_STX_TOKEN_PERIOD) break;
GET_TOKEN (parser);
}
return 0;
}
static int __parse_statement (xp_stx_parser_t* parser)
{
/*
* <statement> ::= <return statement> | <expression>
* <return statement> ::= returnOperator <expression>
* returnOperator ::= '^'
*/
if (parser->token.type == XP_STX_TOKEN_RETURN) {
GET_TOKEN (parser);
if (__parse_expression(parser) == -1) return -1;
EMIT_RETURN_FROM_MESSAGE (parser);
}
else {
if (__parse_expression(parser) == -1) return -1;
}
return 0;
}
static int __parse_expression (xp_stx_parser_t* parser)
{
/*
* <expression> ::= <assignment> | <basic expression>
* <assignment> ::= <assignment target> assignmentOperator <expression>
* <basic expression> ::= <primary> [<messages> <cascaded messages>]
* <assignment target> ::= identifier
* assignmentOperator ::= ':='
*/
xp_stx_t* stx = parser->stx;
if (parser->token.type == XP_STX_TOKEN_IDENT) {
xp_char_t* ident = xp_stx_token_yield (&parser->token, 0);
if (ident == XP_NULL) {
parser->error_code = XP_STX_PARSER_ERROR_MEMORY;
return -1;
}
GET_TOKEN (parser);
if (parser->token.type == XP_STX_TOKEN_ASSIGN) {
GET_TOKEN (parser);
if (__parse_assignment(parser, ident) == -1) {
xp_free (ident);
return -1;
}
}
else {
if (__parse_basic_expression(parser, ident) == -1) {
xp_free (ident);
return -1;
}
}
xp_free (ident);
}
else {
if (__parse_basic_expression(parser, XP_NULL) == -1) return -1;
}
return 0;
}
static int __parse_basic_expression (
xp_stx_parser_t* parser, const xp_char_t* ident)
{
/*
* <basic expression> ::= <primary> [<messages> <cascaded messages>]
*/
xp_bool_t is_super;
if (__parse_primary(parser, ident, &is_super) == -1) return -1;
if (parser->token.type != XP_STX_TOKEN_END &&
parser->token.type != XP_STX_TOKEN_PERIOD) {
if (__parse_message_continuation(parser, is_super) == -1) return -1;
}
return 0;
}
static int __parse_assignment (
xp_stx_parser_t* parser, const xp_char_t* target)
{
/*
* <assignment> ::= <assignment target> assignmentOperator <expression>
*/
xp_word_t i;
xp_stx_t* stx = parser->stx;
for (i = parser->argument_count; i < parser->temporary_count; i++) {
if (xp_strcmp (target, parser->temporaries[i]) == 0) {
if (__parse_expression(parser) == -1) return -1;
EMIT_STORE_TEMPORARY_LOCATION (parser, i);
return 0;
}
}
if (xp_stx_get_instance_variable_index (
stx, parser->method_class, target, &i) == 0) {
if (__parse_expression(parser) == -1) return -1;
EMIT_STORE_RECEIVER_VARIABLE (parser, i);
return 0;
}
if (xp_stx_lookup_class_variable (
stx, parser->method_class, target) != stx->nil) {
if (__parse_expression(parser) == -1) return -1;
/* TODO */
EMIT_CODE_TEST (parser, XP_TEXT("ASSIGN_CLASSVAR #"), target);
//EMIT_STORE_CLASS_VARIABLE (parser, target);
return 0;
}
/* TODO: IMPLEMENT POOL DICTIONARIES */
/* TODO: IMPLEMENT GLOBLAS, but i don't like this idea */
parser->error_code = XP_STX_PARSER_ERROR_UNDECLARED_NAME;
return -1;
}
static int __parse_primary (
xp_stx_parser_t* parser, const xp_char_t* ident, xp_bool_t* is_super)
{
/*
* <primary> ::=
* identifier | <literal> |
* <block constructor> | ( '('<expression>')' )
*/
xp_stx_t* stx = parser->stx;
if (ident == XP_NULL) {
int pos;
xp_word_t literal;
*is_super = xp_false;
if (parser->token.type == XP_STX_TOKEN_IDENT) {
if (__parse_primary_ident(parser,
parser->token.name.buffer, is_super) == -1) return -1;
GET_TOKEN (parser);
}
else if (parser->token.type == XP_STX_TOKEN_CHARLIT) {
pos = __add_character_literal(
parser, parser->token.name.buffer[0]);
if (pos == -1) return -1;
EMIT_PUSH_LITERAL_CONSTANT (parser, pos);
GET_TOKEN (parser);
}
else if (parser->token.type == XP_STX_TOKEN_STRLIT) {
pos = __add_string_literal (parser,
parser->token.name.buffer, parser->token.name.size);
if (pos == -1) return -1;
EMIT_PUSH_LITERAL_CONSTANT (parser, pos);
GET_TOKEN (parser);
}
else if (parser->token.type == XP_STX_TOKEN_NUMLIT) {
/* TODO: other types of numbers, negative numbers, etc */
xp_word_t tmp;
XP_STRTOI (tmp, parser->token.name.buffer, XP_NULL, 10);
literal = XP_STX_TO_SMALLINT(tmp);
pos = __add_literal(parser, literal);
if (pos == -1) return -1;
EMIT_PUSH_LITERAL_CONSTANT (parser, pos);
GET_TOKEN (parser);
}
else if (parser->token.type == XP_STX_TOKEN_SYMLIT) {
pos = __add_symbol_literal (parser,
parser->token.name.buffer, parser->token.name.size);
if (pos == -1) return -1;
EMIT_PUSH_LITERAL_CONSTANT (parser, pos);
GET_TOKEN (parser);
}
else if (parser->token.type == XP_STX_TOKEN_LBRACKET) {
GET_TOKEN (parser);
if (__parse_block_constructor(parser) == -1) return -1;
}
else if (parser->token.type == XP_STX_TOKEN_APAREN) {
/* TODO: array literal */
}
else if (parser->token.type == XP_STX_TOKEN_LPAREN) {
GET_TOKEN (parser);
if (__parse_expression(parser) == -1) return -1;
if (parser->token.type != XP_STX_TOKEN_RPAREN) {
parser->error_code = XP_STX_PARSER_ERROR_NO_RPAREN;
return -1;
}
GET_TOKEN (parser);
}
else {
parser->error_code = XP_STX_PARSER_ERROR_PRIMARY;
return -1;
}
}
else {
/*if (__parse_primary_ident(parser, parser->token.name.buffer) == -1) return -1;*/
if (__parse_primary_ident(parser, ident, is_super) == -1) return -1;
}
return 0;
}
static int __parse_primary_ident (
xp_stx_parser_t* parser, const xp_char_t* ident, xp_bool_t* is_super)
{
xp_word_t i;
xp_stx_t* stx = parser->stx;
*is_super = xp_false;
if (xp_strcmp(ident, XP_TEXT("self")) == 0) {
EMIT_CODE (parser, PUSH_RECEIVER);
return 0;
}
else if (xp_strcmp(ident, XP_TEXT("super")) == 0) {
*is_super = xp_true;
EMIT_CODE (parser, PUSH_RECEIVER);
return 0;
}
else if (xp_strcmp(ident, XP_TEXT("nil")) == 0) {
EMIT_CODE (parser, PUSH_NIL);
return 0;
}
else if (xp_strcmp(ident, XP_TEXT("true")) == 0) {
EMIT_CODE (parser, PUSH_TRUE);
return 0;
}
else if (xp_strcmp(ident, XP_TEXT("false")) == 0) {
EMIT_CODE (parser, PUSH_FALSE);
return 0;
}
/* Refer to __parse_assignment for identifier lookup */
for (i = 0; i < parser->temporary_count; i++) {
if (xp_strcmp(ident, parser->temporaries[i]) == 0) {
EMIT_PUSH_TEMPORARY_LOCATION (parser, i);
return 0;
}
}
if (xp_stx_get_instance_variable_index (
stx, parser->method_class, ident, &i) == 0) {
EMIT_PUSH_RECEIVER_VARIABLE (parser, i);
return 0;
}
/* TODO: what is the best way to look up a class variable? */
/* 1. Use the class containing it and using its position */
/* 2. Use a primitive method after pushing the name as a symbol */
/* 3. Implement a vm instruction to do it */
/*
if (xp_stx_lookup_class_variable (
stx, parser->method_class, ident) != stx->nil) {
//EMIT_LOOKUP_CLASS_VARIABLE (parser, ident);
return 0;
}
*/
/* TODO: IMPLEMENT POOL DICTIONARIES */
/* TODO: IMPLEMENT GLOBLAS, but i don't like this idea */
parser->error_code = XP_STX_PARSER_ERROR_UNDECLARED_NAME;
return -1;
}
static int __parse_block_constructor (xp_stx_parser_t* parser)
{
/*
* <block constructor> ::= '[' <block body> ']'
* <block body> ::= [<block argument>* '|']
* [<temporaries>] [<statements>]
* <block argument> ::= ':' identifier
*/
if (parser->token.type == XP_STX_TOKEN_COLON) {
do {
GET_TOKEN (parser);
if (parser->token.type != XP_STX_TOKEN_IDENT) {
parser->error_code = XP_STX_PARSER_ERROR_BLOCK_ARGUMENT_NAME;
return -1;
}
/* TODO : store block arguments */
GET_TOKEN (parser);
} while (parser->token.type == XP_STX_TOKEN_COLON);
if (!__is_vbar_token(&parser->token)) {
parser->error_code = XP_STX_PARSER_ERROR_BLOCK_ARGUMENT_LIST;
return -1;
}
GET_TOKEN (parser);
}
/* TODO: create a block closure */
if (__parse_temporaries(parser) == -1) return -1;
if (__parse_block_statements(parser) == -1) return -1;
if (parser->token.type != XP_STX_TOKEN_RBRACKET) {
parser->error_code = XP_STX_PARSER_ERROR_BLOCK_NOT_CLOSED;
return -1;
}
GET_TOKEN (parser);
/* TODO: do special treatment for block closures */
return 0;
}
static int __parse_message_continuation (
xp_stx_parser_t* parser, xp_bool_t is_super)
{
/*
* <messages> ::=
* (<unary message>+ <binary message>* [<keyword message>] ) |
* (<binary message>+ [<keyword message>] ) |
* <keyword message>
* <cascaded messages> ::= (';' <messages>)*
*/
if (__parse_keyword_message(parser, is_super) == -1) return -1;
while (parser->token.type == XP_STX_TOKEN_SEMICOLON) {
EMIT_CODE_TEST (parser, XP_TEXT("DoSpecial(DUP_RECEIVER(CASCADE))"), XP_TEXT(""));
GET_TOKEN (parser);
if (__parse_keyword_message(parser, xp_false) == -1) return -1;
EMIT_CODE_TEST (parser, XP_TEXT("DoSpecial(POP_TOP)"), XP_TEXT(""));
}
return 0;
}
static int __parse_keyword_message (xp_stx_parser_t* parser, xp_bool_t is_super)
{
/*
* <keyword message> ::= (keyword <keyword argument> )+
* <keyword argument> ::= <primary> <unary message>* <binary message>*
*/
xp_stx_name_t name;
xp_word_t pos;
xp_bool_t is_super2;
int nargs = 0, n;
if (__parse_binary_message (parser, is_super) == -1) return -1;
if (parser->token.type != XP_STX_TOKEN_KEYWORD) return 0;
if (xp_stx_name_open(&name, 0) == XP_NULL) {
parser->error_code = XP_STX_PARSER_ERROR_MEMORY;
return -1;
}
do {
if (xp_stx_name_adds(&name, parser->token.name.buffer) == -1) {
parser->error_code = XP_STX_PARSER_ERROR_MEMORY;
xp_stx_name_close (&name);
return -1;
}
GET_TOKEN (parser);
if (__parse_primary(parser, XP_NULL, &is_super2) == -1) {
xp_stx_name_close (&name);
return -1;
}
if (__parse_binary_message(parser, is_super2) == -1) {
xp_stx_name_close (&name);
return -1;
}
nargs++;
/* TODO: check if it has too many arguments.. */
} while (parser->token.type == XP_STX_TOKEN_KEYWORD);
pos = __add_symbol_literal (parser, name.buffer, name.size);
if (pos == -1) {
xp_stx_name_close (&name);
return -1;
}
n = (is_super)?
__emit_send_to_super(parser,nargs,pos):
__emit_send_to_self(parser,nargs,pos);
if (n == -1) {
xp_stx_name_close (&name);
return -1;
}
xp_stx_name_close (&name);
return 0;
}
static int __parse_binary_message (xp_stx_parser_t* parser, xp_bool_t is_super)
{
/*
* <binary message> ::= binarySelector <binary argument>
* <binary argument> ::= <primary> <unary message>*
*/
xp_word_t pos;
xp_bool_t is_super2;
int n;
if (__parse_unary_message (parser, is_super) == -1) return -1;
while (parser->token.type == XP_STX_TOKEN_BINARY) {
xp_char_t* op = xp_stx_token_yield (&parser->token, 0);
if (op == XP_NULL) {
parser->error_code = XP_STX_PARSER_ERROR_MEMORY;
return -1;
}
GET_TOKEN (parser);
if (__parse_primary(parser, XP_NULL, &is_super2) == -1) {
xp_free (op);
return -1;
}
if (__parse_unary_message(parser, is_super2) == -1) {
xp_free (op);
return -1;
}
pos = __add_symbol_literal (parser, op, xp_strlen(op));
if (pos == -1) {
xp_free (op);
return -1;
}
n = (is_super)?
__emit_send_to_super(parser,2,pos):
__emit_send_to_self(parser,2,pos);
if (n == -1) {
xp_free (op);
return -1;
}
xp_free (op);
}
return 0;
}
static int __parse_unary_message (xp_stx_parser_t* parser, xp_bool_t is_super)
{
/* <unary message> ::= unarySelector */
xp_word_t pos;
int n;
while (parser->token.type == XP_STX_TOKEN_IDENT) {
pos = __add_symbol_literal (parser,
parser->token.name.buffer, parser->token.name.size);
if (pos == -1) return -1;
n = (is_super)?
__emit_send_to_super(parser,0,pos):
__emit_send_to_self(parser,0,pos);
if (n == -1) return -1;
GET_TOKEN (parser);
}
return 0;
}
static int __get_token (xp_stx_parser_t* parser)
{
xp_cint_t c;
do {
if (__skip_spaces(parser) == -1) return -1;
if (parser->curc == XP_CHAR('"')) {
GET_CHAR (parser);
if (__skip_comment(parser) == -1) return -1;
}
else break;
} while (1);
c = parser->curc;
xp_stx_token_clear (&parser->token);
if (c == XP_CHAR_EOF) {
parser->token.type = XP_STX_TOKEN_END;
}
else if (xp_isalpha(c)) {
if (__get_ident(parser) == -1) return -1;
}
else if (xp_isdigit(c)) {
if (__get_numlit(parser, xp_false) == -1) return -1;
}
else if (c == XP_CHAR('$')) {
GET_CHAR (parser);
if (__get_charlit(parser) == -1) return -1;
}
else if (c == XP_CHAR('\'')) {
GET_CHAR (parser);
if (__get_strlit(parser) == -1) return -1;
}
else if (c == XP_CHAR(':')) {
parser->token.type = XP_STX_TOKEN_COLON;
ADD_TOKEN_CHAR(parser, c);
GET_CHAR (parser);
c = parser->curc;
if (c == XP_CHAR('=')) {
parser->token.type = XP_STX_TOKEN_ASSIGN;
ADD_TOKEN_CHAR(parser, c);
GET_CHAR (parser);
}
}
else if (c == XP_CHAR('^')) {
parser->token.type = XP_STX_TOKEN_RETURN;
ADD_TOKEN_CHAR(parser, c);
GET_CHAR (parser);
}
else if (c == XP_CHAR('[')) {
parser->token.type = XP_STX_TOKEN_LBRACKET;
ADD_TOKEN_CHAR(parser, c);
GET_CHAR (parser);
}
else if (c == XP_CHAR(']')) {
parser->token.type = XP_STX_TOKEN_RBRACKET;
ADD_TOKEN_CHAR(parser, c);
GET_CHAR (parser);
}
else if (c == XP_CHAR('(')) {
parser->token.type = XP_STX_TOKEN_LPAREN;
ADD_TOKEN_CHAR(parser, c);
GET_CHAR (parser);
}
else if (c == XP_CHAR(')')) {
parser->token.type = XP_STX_TOKEN_RPAREN;
ADD_TOKEN_CHAR(parser, c);
GET_CHAR (parser);
}
else if (c == XP_CHAR('#')) {
/*ADD_TOKEN_CHAR(parser, c);*/
GET_CHAR (parser);
c = parser->curc;
if (c == XP_CHAR_EOF) {
parser->error_code = XP_STX_PARSER_ERROR_LITERAL;
return -1;
}
else if (c == XP_CHAR('(')) {
ADD_TOKEN_CHAR(parser, c);
parser->token.type = XP_STX_TOKEN_APAREN;
GET_CHAR (parser);
}
else if (c == XP_CHAR('\'')) {
GET_CHAR (parser);
if (__get_strlit(parser) == -1) return -1;
parser->token.type = XP_STX_TOKEN_SYMLIT;
}
else if (!__is_closing_char(c) && !xp_isspace(c)) {
do {
ADD_TOKEN_CHAR(parser, c);
GET_CHAR (parser);
c = parser->curc;
} while (!__is_closing_char(c) && !xp_isspace(c));
parser->token.type = XP_STX_TOKEN_SYMLIT;
}
else {
parser->error_code = XP_STX_PARSER_ERROR_LITERAL;
return -1;
}
}
else if (c == XP_CHAR('.')) {
parser->token.type = XP_STX_TOKEN_PERIOD;
ADD_TOKEN_CHAR(parser, c);
GET_CHAR (parser);
}
else if (c == XP_CHAR(';')) {
parser->token.type = XP_STX_TOKEN_SEMICOLON;
ADD_TOKEN_CHAR(parser, c);
GET_CHAR (parser);
}
else if (__is_binary_char(c)) {
if (__get_binary(parser) == -1) return -1;
}
else {
parser->error_code = XP_STX_PARSER_ERROR_CHAR;
return -1;
}
//xp_printf (XP_TEXT("TOKEN: %s\n"), parser->token.name.buffer);
return 0;
}
static int __get_ident (xp_stx_parser_t* parser)
{
/*
* identifier ::= letter (letter | digit)*
* keyword ::= identifier ':'
*/
xp_cint_t c = parser->curc;
parser->token.type = XP_STX_TOKEN_IDENT;
do {
ADD_TOKEN_CHAR(parser, c);
GET_CHAR (parser);
c = parser->curc;
} while (xp_isalnum(c));
if (c == XP_CHAR(':')) {
ADD_TOKEN_CHAR (parser, c);
parser->token.type = XP_STX_TOKEN_KEYWORD;
GET_CHAR (parser);
}
return 0;
}
static int __get_numlit (xp_stx_parser_t* parser, xp_bool_t negated)
{
/*
* <number literal> ::= ['-'] <number>
* <number> ::= integer | float | scaledDecimal
* integer ::= decimalInteger | radixInteger
* decimalInteger ::= digits
* digits ::= digit+
* radixInteger ::= radixSpecifier 'r' radixDigits
* radixSpecifier := digits
* radixDigits ::= (digit | uppercaseAlphabetic)+
* float ::= mantissa [exponentLetter exponent]
* mantissa ::= digits'.' digits
* exponent ::= ['-']decimalInteger
* exponentLetter ::= 'e' | 'd' | 'q'
* scaledDecimal ::= scaledMantissa 's' [fractionalDigits]
* scaledMantissa ::= decimalInteger | mantissa
* fractionalDigits ::= decimalInteger
*/
xp_cint_t c = parser->curc;
parser->token.type = XP_STX_TOKEN_NUMLIT;
do {
ADD_TOKEN_CHAR(parser, c);
GET_CHAR (parser);
c = parser->curc;
} while (xp_isalnum(c));
/* TODO; more */
return 0;
}
static int __get_charlit (xp_stx_parser_t* parser)
{
/*
* character_literal ::= '$' character
* character ::= "Any character in the implementation-defined character set"
*/
xp_cint_t c = parser->curc; /* even a new-line or white space would be taken */
if (c == XP_CHAR_EOF) {
parser->error_code = XP_STX_PARSER_ERROR_CHARLIT;
return -1;
}
parser->token.type = XP_STX_TOKEN_CHARLIT;
ADD_TOKEN_CHAR(parser, c);
GET_CHAR (parser);
return 0;
}
static int __get_strlit (xp_stx_parser_t* parser)
{
/*
* string_literal ::= stringDelimiter stringBody stringDelimiter
* stringBody ::= (nonStringDelimiter | (stringDelimiter stringDelimiter)*)
* stringDelimiter ::= ''' "a single quote"
*/
/* TODO: C-like string */
xp_cint_t c = parser->curc;
parser->token.type = XP_STX_TOKEN_STRLIT;
do {
do {
ADD_TOKEN_CHAR (parser, c);
GET_CHAR (parser);
c = parser->curc;
if (c == XP_CHAR_EOF) {
parser->error_code = XP_STX_PARSER_ERROR_STRLIT;
return -1;
}
} while (c != XP_CHAR('\''));
GET_CHAR (parser);
c = parser->curc;
} while (c == XP_CHAR('\''));
return 0;
}
static int __get_binary (xp_stx_parser_t* parser)
{
/*
* binarySelector ::= binaryCharacter+
*/
xp_cint_t c = parser->curc;
ADD_TOKEN_CHAR (parser, c);
if (c == XP_CHAR('-')) {
GET_CHAR (parser);
c = parser->curc;
if (xp_isdigit(c)) return __get_numlit(parser,xp_true);
}
else {
GET_CHAR (parser);
c = parser->curc;
}
/* up to 2 characters only */
if (__is_binary_char(c)) {
ADD_TOKEN_CHAR (parser, c);
GET_CHAR (parser);
c = parser->curc;
}
/* or up to any occurrences */
/*
while (__is_binary_char(c)) {
ADD_TOKEN_CHAR (parser, c);
GET_CHAR (parser);
c = parser->curc;
}
*/
parser->token.type = XP_STX_TOKEN_BINARY;
return 0;
}
static int __skip_spaces (xp_stx_parser_t* parser)
{
while (xp_isspace(parser->curc)) GET_CHAR (parser);
return 0;
}
static int __skip_comment (xp_stx_parser_t* parser)
{
while (parser->curc != XP_CHAR('"')) GET_CHAR (parser);
GET_CHAR (parser);
return 0;
}
static int __get_char (xp_stx_parser_t* parser)
{
xp_cint_t c;
if (parser->ungotc_count > 0) {
parser->curc = parser->ungotc[parser->ungotc_count--];
}
else {
if (parser->input_func (
XP_STX_PARSER_INPUT_CONSUME,
parser->input_owner, (void*)&c) == -1) {
parser->error_code = XP_STX_PARSER_ERROR_INPUT;
return -1;
}
parser->curc = c;
}
return 0;
}
static int __unget_char (xp_stx_parser_t* parser, xp_cint_t c)
{
if (parser->ungotc_count >= xp_countof(parser->ungotc)) return -1;
parser->ungotc[parser->ungotc_count++] = c;
return 0;
}
static int __open_input (xp_stx_parser_t* parser, void* input)
{
if (parser->input_func(
XP_STX_PARSER_INPUT_OPEN,
(void*)&parser->input_owner, input) == -1) {
parser->error_code = XP_STX_PARSER_ERROR_INPUT;
return -1;
}
parser->error_code = XP_STX_PARSER_ERROR_NONE;
parser->curc = XP_CHAR_EOF;
parser->ungotc_count = 0;
return 0;
}
static int __close_input (xp_stx_parser_t* parser)
{
if (parser->input_func(
XP_STX_PARSER_INPUT_CLOSE,
parser->input_owner, XP_NULL) == -1) {
parser->error_code = XP_STX_PARSER_ERROR_INPUT;
return -1;
}
return 0;
}