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parse.php
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parse.php
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<?php
/** skript parse.php do předmětu IPP */
/** autor: Daniel Pátek (xpatek08) */
/** VUT FIT */
/**
* skript parse.php do předmětu IPP
* @author Daniel Pátek (xpatek08)
* VUT FIT
*/
define('ERR_OK', 0);
define('ERR_BAD_ARGS', 10);
define('ERR_HEAD_MISS', 21);
define('ERR_BAD_CODE', 22);
define('ERR_CODE_OTHER', 23);
const TOKEN_EOF = 11;
const TOKEN_CONST = 12;
const TOKEN_VAR = 13;
const TOKEN_HEADER = 14;
const TOKEN_LABEL = 15;
const TOKEN_INSTRUCTION = 16;
const TOKEN_TYPE = 17;
$instruction_list = array(
"MOVE", //0
"CREATEFRAME", //1
"PUSHFRAME",
"POPFRAME",
"DEFVAR",
"CALL", //5
"RETURN",
"PUSHS",
"POPS",
"ADD",
"SUB", //10
"MUL",
"IDIV",
"LT",
"GT",
"EQ", //15
"AND",
"OR",
"NOT",
"INT2CHAR",
"STRI2INT", //20
"READ",
"WRITE",
"CONCAT",
"STRLEN",
"GETCHAR", //25
"SETCHAR",
"TYPE",
"LABEL",
"JUMP",
"JUMPIFEQ", //30
"JUMPIFNEQ",
"EXIT",
"DPRINT",
"BREAK" //34
);
$stderr = fopen('php://stderr', 'w');
$stdout = fopen('php://stdout', 'w');
$stdin = fopen('php://stdin', 'r');
check_args($argc, $argv);
//create DOM document
$dom_docu = new DOMDocument('1.0', 'UTF-8');
$dom_docu->formatOutput = true;
//create XML program syntax
$xml_final = $dom_docu->createElement('program');
$xml_final->setAttribute('language', 'IPPcode20');
$xml_final = $dom_docu->appendChild($xml_final);
//run the syntax check
check_syntax_build_xml();
//print the XML to stdout
echo $dom_docu->saveXML();
exit(ERR_OK);
/**
* Funkce pro kontrolu argumentů a vypsání help
* @param int $argc Počet argumentů při spuštění programu
* @param string $argv Pole argumentů ve formátu string
*/
function check_args($argc, $argv) {
global $stderr;
for ($i=1; $i < $argc; $i++) {
if ($argv[$i] == "--help") {
if ($argc > 2) {
fwrite($stderr, "Nemuzete zadat vice argumentu spolecne s \"--help\".\n");
exit(ERR_BAD_ARGS);
}
echo "Skript typu filtr (parse.php v jazyce PHP 7.4)\n";
echo "nacte ze standardniho vstupu zdrojovy kod v IPPcode20\n";
echo "zkontroluje lexikalni a syntaktickou spravnost kodu\n";
echo "a vypise na standardni vystup XML reprezentaci programu.\n";
exit(ERR_OK);
}
}
}
/**
* Syntaktická kontrola zdrojového kódu a tvorba XML reprezentace programu
*/
function check_syntax_build_xml() {
global $stderr;
global $instruction_list;
global $dom_docu;
global $xml_final;
$inst_counter = 0;
$analyzed_sentence = array(); //array
//first we have to check the header
$analyzed_sentence = next_sentence_scan();
if ($analyzed_sentence[0] != NULL) {
if ($analyzed_sentence[0][0] != NULL) {
if ($analyzed_sentence[0][0] != TOKEN_HEADER) {
fwrite($stderr, "Chybi spravna hlavicka (ippcode20).\n");
exit(ERR_HEAD_MISS);
}
}
else {
fwrite($stderr, "Vyskytla se neocekanava chyba.\n");
exit(ERR_CODE_OTHER);
}
}
else {
fwrite($stderr, "Vyskytla se neocekanava chyba.\n");
exit(ERR_CODE_OTHER);
}
//start to check instructions and generate xml code
while ($analyzed_sentence[0][0] != 11) {
//take the first sentence
$analyzed_sentence = next_sentence_scan();
switch ($analyzed_sentence[0][0]) {
case TOKEN_HEADER:
fwrite($stderr, "Hlavicka je umistena na nespravnem miste.\n");
exit(ERR_CODE_OTHER);
case TOKEN_EOF:
break;
case TOKEN_INSTRUCTION:
break;
default:
fwrite($stderr, "Vyskytla se syntakticka chyba pri zpracovani syntaxe.\n");
exit(ERR_BAD_CODE);
}
if ($analyzed_sentence[0][0] == TOKEN_EOF) {
break;
}
elseif ($analyzed_sentence[0][0] == TOKEN_INSTRUCTION) {
$inst_counter++;
//create xml instruction
$instruction = $dom_docu->createElement("instruction");
$instruction->setAttribute("order", $inst_counter);
$instruction->setAttribute("opcode", $instruction_list[$analyzed_sentence[0][1]]);
//check the args of each instruction
switch ($analyzed_sentence[0][1]) {
case 1: case 2: case 3: case 6: case 34:
//now we have to make sure that there is no operand
//CREATEFRAME PUSHFRAME POPFRAME RETURN BREAK
check_instr_number_args($analyzed_sentence, 0);
break;
case 4: case 8:
//these are instructions with one var operand
//DEFVAR POPS
//first check the number of args
check_instr_number_args($analyzed_sentence, 1);
//check if it correct argument
check_instr_type_arg($analyzed_sentence, TOKEN_VAR);
//add xml type of arg to xml documnet (as child of the current instruction)
$var_arg = $dom_docu->createElement("arg1", htmlspecialchars($analyzed_sentence[1][1]));
$var_arg->setAttribute("type", "var");
$instruction->appendChild($var_arg);
break;
//next check types
case 5: case 28: case 29:
//one operand instruction with LABEL operand
//CALL LABEL JUMP
//first check the number of args
check_instr_number_args($analyzed_sentence, 1);
//then check the argument label
check_instr_type_arg($analyzed_sentence, TOKEN_LABEL);
//add xml type of arg to xml documnet (as child of the current instruction)
$var_arg = $dom_docu->createElement("arg1", htmlspecialchars($analyzed_sentence[1][1]));
$var_arg->setAttribute("type", "label");
$instruction->appendChild($var_arg);
break;
case 7: case 22: case 32: case 33:
//one operand instruction with SYMB operand
//PUSHS WRITE EXIT DPRINT
//check the number of args
check_instr_number_args($analyzed_sentence, 1);
//check const argument
check_symb_arg($analyzed_sentence[1], $analyzed_sentence[0][1]);
//add xml type of arg to xml documnet (as child of the current instruction)
if ($analyzed_sentence[1][0] == TOKEN_VAR) {
$var_arg = $dom_docu->createElement("arg1", htmlspecialchars($analyzed_sentence[1][1]));
$var_arg->setAttribute("type", "var");
}
else {
$var_arg = $dom_docu->createElement("arg1", htmlspecialchars($analyzed_sentence[1][2]));
$var_arg->setAttribute("type", $analyzed_sentence[1][1]);
}
$instruction->appendChild($var_arg);
break;
case 0: case 19: case 24: case 27: case 18:
//two args instructions
//MOVE INT2CHAR READ STRLEN TYPE NOT
//agr1: var arg2: symb
//check the number of args
check_instr_number_args($analyzed_sentence, 2);
//check the first argument
check_instr_type_arg($analyzed_sentence, TOKEN_VAR);
//check the second argumnet
check_symb_arg($analyzed_sentence[2], $analyzed_sentence[0][1]);
//generate xml arg1
$var_arg = $dom_docu->createElement("arg1", htmlspecialchars($analyzed_sentence[1][1]));
$var_arg->setAttribute("type", "var");
$instruction->appendChild($var_arg);
//generate xml arg2
if ($analyzed_sentence[2][0] == TOKEN_VAR) {
$var_arg = $dom_docu->createElement("arg2", htmlspecialchars($analyzed_sentence[2][1]));
$var_arg->setAttribute("type", "var");
}
else {
$var_arg = $dom_docu->createElement("arg2", htmlspecialchars($analyzed_sentence[2][2]));
$var_arg->setAttribute("type", $analyzed_sentence[2][1]);
}
$instruction->appendChild($var_arg);
break;
case 21:
//just instruction READ
//arg1: var arg2: type
//check number and first agr
check_instr_number_args($analyzed_sentence, 2);
check_instr_type_arg($analyzed_sentence, TOKEN_VAR);
//check the type argumnent
if ($analyzed_sentence[2][0] == TOKEN_TYPE) {
$var_arg = $dom_docu->createElement("arg1", htmlspecialchars($analyzed_sentence[1][1]));
$var_arg->setAttribute("type", "var");
$instruction->appendChild($var_arg);
$var_arg = $dom_docu->createElement("arg2", htmlspecialchars($analyzed_sentence[2][1]));
$var_arg->setAttribute("type", "type");
$instruction->appendChild($var_arg);
}
else {
fwrite($stderr, "Druhy argument u instrukce TYPE musi byt typ. (string, int, bool, nil)\n");
exit(ERR_CODE_OTHER);
}
break;
case 9: case 10: case 11: case 12: case 13: case 14: case 15: case 16: case 17: case 20: case 23: case 25: case 26:
// ADD SUB MUL IDIV LT GT EG AND OR
//check number and first arg
check_instr_number_args($analyzed_sentence, 3);
check_instr_type_arg($analyzed_sentence, TOKEN_VAR);
//check the second and third argument
check_symb_arg($analyzed_sentence[2], $analyzed_sentence[0][1]);
check_symb_arg($analyzed_sentence[3], $analyzed_sentence[0][1]);
//generate first xml
$var_arg = $dom_docu->createElement("arg1", htmlspecialchars($analyzed_sentence[1][1]));
$var_arg->setAttribute("type", "var");
$instruction->appendChild($var_arg);
//generate xml for the second argument
if ($analyzed_sentence[2][0] == TOKEN_VAR) {
$var_arg = $dom_docu->createElement("arg2", htmlspecialchars($analyzed_sentence[2][1]));
$var_arg->setAttribute("type", "var");
}
else {
$var_arg = $dom_docu->createElement("arg2", htmlspecialchars($analyzed_sentence[2][2]));
$var_arg->setAttribute("type", $analyzed_sentence[2][1]);
}
$instruction->appendChild($var_arg);
//generate xml for the third argument
if ($analyzed_sentence[3][0] == TOKEN_VAR) {
$var_arg = $dom_docu->createElement("arg3", htmlspecialchars($analyzed_sentence[3][1]));
$var_arg->setAttribute("type", "var");
}
else {
$var_arg = $dom_docu->createElement("arg3", htmlspecialchars($analyzed_sentence[3][2]));
$var_arg->setAttribute("type", $analyzed_sentence[3][1]);
}
$instruction->appendChild($var_arg);
break;
case 30: case 31:
//JUMPIFEQ JUMPIFNEQ
//check number and first arg
check_instr_number_args($analyzed_sentence, 3);
check_instr_type_arg($analyzed_sentence, TOKEN_LABEL);
//check the second and third argument
check_symb_arg($analyzed_sentence[2], $analyzed_sentence[0][1]);
check_symb_arg($analyzed_sentence[3], $analyzed_sentence[0][1]);
//generate first xml
$var_arg = $dom_docu->createElement("arg1", htmlspecialchars($analyzed_sentence[1][1]));
$var_arg->setAttribute("type", "label");
$instruction->appendChild($var_arg);
//generate xml for the second argument
if ($analyzed_sentence[2][0] == TOKEN_VAR) {
$var_arg = $dom_docu->createElement("arg2", htmlspecialchars($analyzed_sentence[2][1]));
$var_arg->setAttribute("type", "var");
}
else {
$var_arg = $dom_docu->createElement("arg2", htmlspecialchars($analyzed_sentence[2][2]));
$var_arg->setAttribute("type", $analyzed_sentence[2][1]);
}
$instruction->appendChild($var_arg);
//generate xml for the third argument
if ($analyzed_sentence[3][0] == TOKEN_VAR) {
$var_arg = $dom_docu->createElement("arg3", htmlspecialchars($analyzed_sentence[3][1]));
$var_arg->setAttribute("type", "var");
}
else {
$var_arg = $dom_docu->createElement("arg3", htmlspecialchars($analyzed_sentence[3][2]));
$var_arg->setAttribute("type", $analyzed_sentence[3][1]);
}
$instruction->appendChild($var_arg);
break;
default:
# code...
break;
}
}
else {
fwrite($stderr, "Vyskytla se syntakticka chyba pri zpracovani syntaxe[1].\n");
exit(ERR_BAD_CODE);
}
$xml_final->appendChild($instruction);
}
}
/**
* Lexikální kontrola zdrojového kódu a tvorba pole objektů na aktuálním řádku
* @return array $prepared_sentence Pole objektů na aktuálním řádku
*/
function next_sentence_scan() {
global $stderr;
global $stdin;
$prepared_sentence = array(); //this goes back to syntax_parser (array of arrrays)
$start_sentense = true; //when im on the start of sentence, i have to check instruction
while (true) {
//checking EOF
if (($sentence = fgets($stdin)) == false) {
array_push($prepared_sentence, array(TOKEN_EOF));
return $prepared_sentence;
}
//check if the sentence is comment or just newline
if (preg_match('~^\s*#~', $sentence) || preg_match('~^\s*$~', $sentence)) {
continue;
}
//check that the line does not have comment at the end, takes just the first part
//make array of words and delete "" content
$split_comment = explode('#', $sentence);
$split_word = preg_split('~\s+~', $split_comment[0]);
if (end($split_word) == "") {
array_pop($split_word);
}
if ($split_word[0] == "") {
array_shift($split_word);
}
break;
}
foreach($split_word as $word) {
if (preg_match('~@~', $word)) {
//will be bool, string, int nebo nil [constant]
if (preg_match('~^(int|bool|nil|string)~', $word)) {
//check the lexem
if (
preg_match('~^int@[+-]?[0-9]+$~', $word) ||
preg_match('~^nil@nil$~', $word) ||
preg_match('~^bool@(true|false)$~', $word) ||
preg_match('~^string@$~', $word) ||
(preg_match('~^string@~', $word) &&
!preg_match('~(\\\\($|\p{S}|\p{P}\p{Z}|\p{M}|\p{L}|\p{C})|(\\\\[0-9]{0,2}($|\p{S}|\p{P}\p{Z}|\p{M}|\p{L}|\p{C}))| |#)~', $word))
) {
//now we have completed lexical analysis of constant [\u0000-\u002F\u003A-\uFFFF]
$type_and_data = explode('@', $word, 2);
$final = array();
array_push($final, TOKEN_CONST);
array_push($final, $type_and_data[0]);
array_push($final, $type_and_data[1]);
array_push($prepared_sentence, $final);
}
else {
fwrite($stderr, "Konstanta $word ma spatny format.\n");
exit(ERR_CODE_OTHER);
}
}
else {
//this could be variable
if (preg_match('~^(GF|TF|LF)@[a-zA-Z_\-$&%*!?]*$~', $word)) {
array_push($prepared_sentence, array(TOKEN_VAR, $word));
}
else {
fwrite($stderr, "Konstanta $word ma spatny typ.\n");
exit(ERR_CODE_OTHER);
}
}
}
else {
if (preg_match('~^(int|bool|string|nil)$~', $word)) {
//this is just type
array_push($prepared_sentence, array(TOKEN_TYPE, $word));
}
else {
if (preg_match('~^\.ippcode20$~i', $word)) {
//this is header
array_push($prepared_sentence, array(TOKEN_HEADER));
}
else {
//now i have to check whether its instruction or label
$instr_number = -1;
$instr_number = find_instruction($word);
if ($instr_number != -1 && $start_sentense == true) {
//found instruction
array_push($prepared_sentence, array(TOKEN_INSTRUCTION, $instr_number));
}
else {
//it has to be label now
if (preg_match('~^[a-zA-Z_\-$&%*!?][a-zA-Z0-9_\-$&%*!?]*$~', $word)) {
array_push($prepared_sentence, array(TOKEN_LABEL, $word));
}
else {
//error
fwrite($stderr, "Nerozpoznane slovo \"$word\", lexikalni chyba.\n");
exit(ERR_BAD_CODE);
}
}
}
}
}
//back to another word
$start_sentense = false;
}
//array_push($prepared_sentence, array('ajjja', 10));
return $prepared_sentence;
}
/**
* Hledá slovo v seznamu instrukcí
* @param string $word Potenciální instrukční slovo
* @return int Číslo instrukce (-1 pro nenalezeno)
*/
function find_instruction($word) {
global $instruction_list;
for ($i=0; $i <= 34; $i++) {
if (strcasecmp($word, $instruction_list[$i]) == 0){
//return number of instruction
return $i;
}
}
//didnt find any instruction with that name
return -1;
}
/**
* Kontrola počtu argumentů u instrukce
* @param array $some_sentence Aktuální věta tvořená objekty (intrukcí a argumenty)
* @param int $number Správný počet argumentů instrukce
*/
function check_instr_number_args($some_sentence, $number) {
global $stderr;
global $instruction_list;
if (count($some_sentence) != ($number + 1)) {
$obj = $instruction_list[$some_sentence[0][1]];
if ($number == 1) {
fwrite($stderr, "Instrukce $obj musí mít pouze jeden argument.\n");
}
else if ($number == 0) {
fwrite($stderr, "Instrukce $obj nesmí mít žádný argument.\n");
}
else {
fwrite($stderr, "Instrukce $obj musí mít přesně $number argumenty.\n");
}
exit(ERR_CODE_OTHER);
}
}
/**
* Kontrola typu prvního argumentu u instrukce na aktuálním řádku
* @param array $another_sentence Aktuální věta (intrukce), tvořená objekty
* @param int $right_type Číslo správného typu (tokenu)
*/
function check_instr_type_arg($another_sentence, $right_type) {
global $stderr;
global $instruction_list;
if ($another_sentence[1][0] != $right_type) {
$obj = $instruction_list[$another_sentence[0][1]];
fwrite($stderr, "Instrukce $obj má špatný typ argumentu.\n");
exit(ERR_CODE_OTHER);
}
}
/**
* Kontrola typu argumentu u instrukce na aktuálním řádku
* @param array $another_object Aktuální argument instrukce
* @param int $instruction_n Číslo instrukce
*/
function check_symb_arg($another_object, $instruction_n) {
global $stderr;
global $instruction_list;
if ($another_object[0] != TOKEN_VAR && $another_object[0] != TOKEN_CONST) {
$obj = $instruction_list[$instruction_n];
fwrite($stderr, "Spatny typ argumentu u instrukce $obj.\n");
exit(ERR_CODE_OTHER);
}
}
?>