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analyseur_synthaxique.c
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analyseur_synthaxique.c
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#include "analyseur_synthaxique.h"
#include "errors.h"
/**
* The start of the syntactic analyzer
*/
//PROGRAM := SUBPROGRAM_BODY
boolean PROGRAM() {
// Initialization
init_symbol();
init_symbol_table();
_pseudo_code_init();
// Reading the first token
next_symbol();
boolean result = false;
address_offset = 0;
// Trying to find the grammar to execute
if (SUBPROGRAM_BODY()) result = true;
_pseudo_code_add_inst(LDA, get_first_procedure_address());
_pseudo_code_add_inst(JSR, 0);
_pseudo_code_add_inst(HLT, 0);
// Showing the symbol table
show_symbol_table();
_pseudo_code_write_text();
return result;
}
//******************************************************
//********************************************************
// SYNTACTIC ANALYZER FUNCTIONS
//SUBPROGRAM_BODY := SUBPROGRAM_SPECIFICATION is DECLARATIVE_PART begin HANDLED_STATEMENT_OF_SEQUENCE end [DESIGNATOR];
static boolean SUBPROGRAM_BODY(){
/* The identifiers declared now are not variables */
state = PROCEDURE_NAME;
int symbol_table_start = symbol_table_size;
if(!SUBPROGRAM_SPECIFICATION()) return false;
if (current_symbol.code != IS_TOKEN) raise_error(IS_EXPECTED_ERROR);
next_symbol();
/* The identifiers declared now can be variables */
state = VARIABLE_NAME;
if(!DECLARATIVE_PART()) raise_error(DECLARATIVE_PART_ERROR);
if (current_symbol.code != BEGIN_TOKEN) raise_error(BEGIN_EXPECTED_ERROR);
next_symbol();
if(!HANDLED_STATEMENT_OF_SEQUENCE()) raise_error(HANDLED_STATEMENT_OF_SEQUENCE_ERROR);
if (current_symbol.code != END_TOKEN) raise_error(END_EXPECTED_ERROR);
next_symbol();
if (DESIGNATOR()) next_symbol();
if (current_symbol.code != SEMICOLON_TOKEN) raise_error(SEMICOLON_EXPECTED_ERROR);
next_symbol();
/* Clearing the memory spots used by this sybprogram */
int to_clean_spots = _symbol_table_to_free(symbol_table_start);
current_address -= to_clean_spots;
_pseudo_code_add_inst(FRE, to_clean_spots);
address_offset--;
/* Generating the return instruction to the previous subprogram */
_pseudo_code_add_inst(RTS, 0);
_pseudo_code_fix_spd();
return true;
}
/*
* DESIGNATOR ::= name
*/
static boolean DESIGNATOR() {
if (current_symbol.code == ID_TOKEN) return true;
return false;
}
//SUBPROGRAM_SPECIFICATION := PROCEDURE_SPECIFICATION | FUNCTION_SPECIFICATION
static boolean SUBPROGRAM_SPECIFICATION () {
if (PROCEDURE_SPECIFICATION()) return true;
//else if (FUNCTION_SPECIFICATION()) return true;
else return false;
}
//PROCEDURE_SPECIFICATION := procedure DPUN PARAMETER_PROFILE
static boolean PROCEDURE_SPECIFICATION(){
if (current_symbol.code != PROCEDURE_TOKEN) {return false;}
next_symbol();
if(!DPUN()) raise_error(DPUN_ERROR);
PARAMETER_PROFILE();
return true;
}
//DPUN := [PARENT_UNIT_NAME] DEFINING_IDENTIFIER
static boolean DPUN(){
//PARENT_UNIT_NAME();
if(DEFINING_IDENTIFIER()) return true;
return false;
}
// DEFINING_IDENTIFIER := id
static boolean DEFINING_IDENTIFIER(){
if (current_symbol.code != ID_TOKEN) return false;
/**
* Ajout dans la table des symboles
*/
if (symbol_exists() != -1) {
raise_error(SYMBOL_EXISTS_ERROR);
} else {
if (state == PROCEDURE_NAME) {
_pseudo_code_add_inst(SPD, -1);
address_offset++;
add_symbol(TPROC);
set_last_symbol_address(_pseudo_code_current_line());
}
else if (state == VARIABLE_NAME) {
add_symbol(TVAR);
_pseudo_code_add_inst(INT, 1);
}
}
next_symbol();
return true;
}
//PARAMETER_PROFILE := FORMAT_PART
static boolean PARAMETER_PROFILE() {
if(FORMAT_PART()) return true;
return false;
}
//FORMAT_PART := (PARAMETER_SPECIFICATION{;PARAMETER_SPECIFICATION})
static boolean FORMAT_PART() {
if (current_symbol.code != OPEN_PARENTHESIS_TOKEN) return false;
next_symbol();
if (!PARAMETER_SPECIFICATION()) raise_error(PARAMETER_SPECIFICATION_ERROR);
while (current_symbol.code == SEMICOLON_TOKEN) {
next_symbol();
if(!PARAMETER_SPECIFICATION()) raise_error(PARAMETER_SPECIFICATION_ERROR);
}
if (current_symbol.code != CLOSE_PARENTHESIS_TOKEN) raise_error(PF_EXPECTED_ERROR);
next_symbol();
return true;
}
//PARAMETER_SPECIFICATION ::= DEFINING_IDENTIFIER_LIST:MODE
static boolean PARAMETER_SPECIFICATION() {
if(!DEFINING_IDENTIFIER_LIST()) return false;
if (current_symbol.code != DEUXPOINTS_TOKEN) raise_error(DEUXPOINTS_EXPECTED_ERROR);
next_symbol();
if(!MODE()) raise_error(MODE_ERROR);
return true;
}
//DEFINING_IDENTIFIER_LIST :: = DEFINING_IDENTIFIER
static boolean DEFINING_IDENTIFIER_LIST() {
if(DEFINING_IDENTIFIER()) return true;
return false;
}
//MODE ::= IN | INOUT |OUT |epsilon
static boolean MODE() {
if (current_symbol.code != IN_TOKEN) {
if (current_symbol.code != INOUT_TOKEN) {
if (current_symbol.code != OUT_TOKEN) {
return true;
}
}
}
next_symbol();
return true;
}
/********************************************************
*******************************************************/
/**
* DECLARATIVE_PART ::= {DECLARATIVE ITEM}
*/
static boolean DECLARATIVE_PART() {
while(DECLARATIVE_ITEM()){}
return true;
}
/**
* DECLARATIVE_ITEM ::= BASIC_DECLARATIVE_ITEM | BODY
*/
static boolean DECLARATIVE_ITEM() {
if(!BASIC_DECLARATIVE_ITEM()){
if(!BODY()) return false;
}
return true;
}
/**
* BASIC_DECLARATIVE_ITEM ::= BASIC_DECLARATION
*/
static boolean BASIC_DECLARATIVE_ITEM(){
if(!BASIC_DECLARATION()) return false;
return true;
}
/**
* BODY ::= PROPER_BODY | BODY_STUB
*/
static boolean BODY() {
if(!PROPER_BODY()){
if(!BODY_STUB()) return false;
}
return true;
}
static boolean BODY_STUB(){
return false;
}
/**
* PROPER_BODY ::= SUBPROGRAM_BODY | PACKAGE_BODY | PROTECTED_BODY
*/
static boolean PROPER_BODY(){
if(!SUBPROGRAM_BODY()){
if(!PACKAGE_BODY()){
if(!PROTECTED_BODY()) return false;
}
}
return true;
}
/**
* BASIC_DECLARATION ::= TYPE_DECLARATION | OBJECT_DECLARATION
*/
static boolean BASIC_DECLARATION () {
if(!OBJECT_DECLARATION()) return false;
return true;
}
static boolean PACKAGE_BODY(){
return false;
}
static boolean PROTECTED_BODY(){
return false;
}
static boolean OBJECT_DECLARATION () {
if(!DEFINING_IDENTIFIER_LIST()){
return false;
}
int address = get_last_symbol_address();
if (current_symbol.code != DEUXPOINTS_TOKEN) {
raise_error(DEUXPOINTS_EXPECTED_ERROR);
}
next_symbol();
if (current_symbol.code == CONSTANT_TOKEN) {
set_last_symbol_const();
next_symbol();
}
if(!SUBTYPE_INDICATION()){
raise_error(SUBTYPE_INDICATION_ERROR);
}
if (current_symbol.code == AFFECTATION_TOKEN) {
next_symbol();
_pseudo_code_add_inst(LDA, address);
if(!EXPRESSION()) raise_error(EXPRESSION_ERROR);
_pseudo_code_add_inst(STO, 0);
}
if (current_symbol.code == SEMICOLON_TOKEN) {
next_symbol();
}
return true;
}
// where we will define our types //int..
static boolean SUBTYPE_INDICATION() {
if (current_symbol.code == INTEGER_TYPE_TOKEN) {
set_last_symbol_type(TINT);
} else if (current_symbol.code == CHAR_TYPE_TOKEN) {
set_last_symbol_type(TCHR);
} else if (current_symbol.code == FLOAT_TYPE_TOKEN) {
set_last_symbol_type(TFLT);
} else if (current_symbol.code == ARRAY_TOKEN) {
/*
* This is where we start declaring the array
*/
next_symbol();
if (current_symbol.code != OPEN_PARENTHESIS_TOKEN) raise_error(PO_EXPECTED_ERROR);
next_symbol();
if (current_symbol.code != INTEGER_TOKEN) raise_error(INTEGER_EXPECTED_ERROR);
int start = atoi(current_symbol.word);
set_last_symbol_start(start);
next_symbol();
if (current_symbol.code != POINT_POINT_TOKEN) raise_error(POINT_POINT_EXPECTED_ERROR);
next_symbol();
if (current_symbol.code != INTEGER_TOKEN) raise_error(INTEGER_EXPECTED_ERROR);
int end = atoi(current_symbol.word);
set_last_symbol_end(end);
next_symbol();
if (current_symbol.code != CLOSE_PARENTHESIS_TOKEN) raise_error(CLOSE_PARENTHESIS_TOKEN_ERROR);
next_symbol();
if (current_symbol.code != OF_TOKEN) raise_error(OF_EXPECTED_ERROR);
next_symbol();
if (current_symbol.code == INTEGER_TYPE_TOKEN) set_last_symbol_type(TINT);
_pseudo_code_add_inst(INT, end-start);
}
next_symbol();
return true;
}
/**
* HANDLED_STATEMENT_OF_SEQUENCE ::= SEQUENCE_OF_STATEMENT
*/
static boolean HANDLED_STATEMENT_OF_SEQUENCE() {
if (SEQUENCE_OF_STATEMENT()) return true;
return false;
}
/**
* SEQUENCE_OF_STATEMENT ::= STATEMENT {STATEMENT}
//{LABEL}
*/
static boolean SEQUENCE_OF_STATEMENT() {
// Reading at least one statement grammar
if (!STATEMENT()) return false;
while(STATEMENT()){}
//while(LABEL()){}
return true;
}
/**
* STATEMENT ::= {LABEL} SIMPLE_STATEMENT | {LABEL} COMPOUND_STATEMENT
//{LABEL}
*/
static boolean STATEMENT() {
// Reading a simple statement or a compound statement
//while(LABEL()){}
if (SIMPLE_STATEMENT()) return true;
else if (COMPOUND_STATEMENT()) return true;
else return false;
}
/**
* SIMPLE_STATEMENT ::= ASSIGNEMENT_OR_PROCEDURE_CALL_STATEMENT | EXIT_STATEMENT | SIMPLE_RETURN_STATEMENT | IO_STATEMENT
*/
static boolean SIMPLE_STATEMENT() {
if (ASSIGNEMENT_OR_PROCEDURE_CALL_STATEMENT()) return true;
else if (SIMPLE_RETURN_STATEMENT()) return true;
else if (IO_STATEMENT()) return true;
else if (EXIT_STATEMENT()) return true;
else return false;
}
// COMPOUND_STATEMENT ::= IF_STATEMENT | CASE_STATEMENT | LOOP_STATEMENTS
static boolean COMPOUND_STATEMENT() {
if(IF_STATEMENT()) return true;
else if(CASE_STATEMENT()) return true;
else if(LOOP_STATEMENTS()) return true;
return false;
}
static boolean CASE_STATEMENT() {
if (current_symbol.code != CASE_TOKEN) return false;
next_symbol();
if (current_symbol.code != ID_TOKEN) raise_error(IDENTIFIER_EXPECTED_ERROR);
if (symbol_exists() == -1) raise_error(SYMBOL_DONT_EXIST);
_pseudo_code_add_inst(LDA, get_address());
_pseudo_code_add_inst(LDV, 0);
next_symbol();
if (current_symbol.code != IS_TOKEN) raise_error(IS_EXPECTED_ERROR);
next_symbol();
int counter = 0;
while (current_symbol.code == WHEN_TOKEN) {
next_symbol();
if (current_symbol.code == OTHERS_TOKEN) {
next_symbol();
if (current_symbol.code != NEXT_TOKEN) raise_error(NEXT_EXPECTED_ERROR);
next_symbol();
if (!SEQUENCE_OF_STATEMENT()) raise_error(SEQUENCE_STATEMENT_ERROR);
} else{
counter++;
_pseudo_code_add_inst(DUP, 0);
if (current_symbol.code == INTEGER_TOKEN) _pseudo_code_add_inst(LDI, atoi(current_symbol.word));
_pseudo_code_add_inst(EQL, 0);
_pseudo_code_add_inst(BZE, -1);
next_symbol();
if (current_symbol.code != NEXT_TOKEN) raise_error(NEXT_EXPECTED_ERROR);
next_symbol();
if (!SEQUENCE_OF_STATEMENT()) raise_error(SEQUENCE_STATEMENT_ERROR);
_pseudo_code_add_inst(BRN, -1);
_pseudo_code_fix_bze();
}
}
for (int i = 0; i < counter; i++) _pseudo_code_fix_brn();
if (current_symbol.code != END_TOKEN) raise_error(END_EXPECTED_ERROR);
next_symbol();
if (current_symbol.code == CASE_TOKEN) next_symbol();
if (current_symbol.code != SEMICOLON_TOKEN) raise_error(SEMICOLON_EXPECTED_ERROR);
next_symbol();
_pseudo_code_add_inst(FRE, 1);
return true;
}
/*
* LOOP_STATEMENTS ::= WHILE_LOOP_STATEMENT | FOR_LOOP_STATEMENT | LOOP_STATEMENT;
*/
static boolean LOOP_STATEMENTS() {
if (WHILE_LOOP_STATEMENT()) return true;
else if (FOR_LOOP_STATEMENT()) return true;
else if (LOOP_STATEMENT()) return true;
else return false;
}
/*
* WHILE_LOOP_STATEMENT ::= while CONDITION loop SEQUENCE_OF_STATEMENT end [loop];
*/
static boolean WHILE_LOOP_STATEMENT() {
if (current_symbol.code != WHILE_TOKEN) return false;
next_symbol();
//indice
int indice_brn = line_number;
if (!CONDITION()) raise_error(CONDITION_ERROR);
_pseudo_code_add_inst(BZE, -1);
if (current_symbol.code != LOOP_TOKEN) raise_error(LOOP_EXPECTED_ERROR);
next_symbol();
if(!SEQUENCE_OF_STATEMENT()) raise_error(SEQUENCE_STATEMENT_ERROR);
//BRN
_pseudo_code_add_inst(BRN,indice_brn);
_pseudo_code_fix_bze();//Mery
if (current_symbol.code != END_TOKEN) raise_error(END_EXPECTED_ERROR);
next_symbol();
if (current_symbol.code == LOOP_TOKEN) next_symbol();
if (current_symbol.code != SEMICOLON_TOKEN) raise_error(SEMICOLON_EXPECTED_ERROR);
next_symbol();
return true;
}
/*
* FOR_LOOP_STATEMENT ::= for ID in integer .. integer LOOP SEQUENCE_OF_STATEMENT END LOOP;
*/
static boolean FOR_LOOP_STATEMENT() {
if (current_symbol.code != FOR_TOKEN) return false;
next_symbol();
int id_adrr = get_address();
if (current_symbol.code != ID_TOKEN) raise_error(IDENTIFIER_EXPECTED_ERROR);
next_symbol();
if (current_symbol.code != IN_TOKEN) raise_error(IN_EXPECTED_ERROR);
next_symbol();
int val1 = atoi(current_symbol.word);
_pseudo_code_add_inst(LDA, id_adrr);
_pseudo_code_add_inst(LDI, val1);
_pseudo_code_add_inst(STO, 0);
next_symbol();
next_symbol();
int val2 = atoi(current_symbol.word);
next_symbol();
//test
int indice_brn = line_number;
//test
_pseudo_code_add_inst(LDA, id_adrr);
_pseudo_code_add_inst(LDV , 0);
_pseudo_code_add_inst(LDI, val2);
_pseudo_code_add_inst(LEQ, 0);
//test
//BZE
_pseudo_code_add_inst(BZE, -1);
if (current_symbol.code != LOOP_TOKEN) raise_error(LOOP_EXPECTED_ERROR);
next_symbol();
if(!SEQUENCE_OF_STATEMENT()) raise_error(SEQUENCE_STATEMENT_ERROR);
//
_pseudo_code_add_inst(LDA, id_adrr);
_pseudo_code_add_inst(LDA, id_adrr);
_pseudo_code_add_inst(LDV , 0);
_pseudo_code_add_inst(LDI, 1);
_pseudo_code_add_inst(ADD, 0);
_pseudo_code_add_inst(STO, 0);
//
_pseudo_code_add_inst(BRN,indice_brn);
_pseudo_code_fix_bze();//Mery
if (current_symbol.code != END_TOKEN) raise_error(END_EXPECTED_ERROR);
next_symbol();
if (current_symbol.code == LOOP_TOKEN) next_symbol();
if (current_symbol.code != SEMICOLON_TOKEN) raise_error(SEMICOLON_EXPECTED_ERROR);
next_symbol();
}
/**
* loop_statement ::= loop sequence_of_statements end loop ;
*/
static boolean LOOP_STATEMENT() {
if(current_symbol.code!=LOOP_TOKEN) return false;
next_symbol();
/**
* generate pseudo code
*/
int indice_brn = line_number;
if(!SEQUENCE_OF_STATEMENT()){
raise_error(SEQUENCE_STATEMENT_ERROR);
}
/**
* generate pseudo code
*/
_pseudo_code_add_inst(BRN,indice_brn);
_pseudo_code_fix_nbz();
if(current_symbol.code!=END_TOKEN) {
raise_error(END_EXPECTED_ERROR);
}
next_symbol();
if(current_symbol.code!=LOOP_TOKEN) {
raise_error(LOOP_EXPECTED_ERROR);
}
next_symbol();
if(current_symbol.code!=SEMICOLON_TOKEN) {
raise_error(SEMICOLON_EXPECTED_ERROR);
}
next_symbol();
return true;
}
/**
* ASSIGNEMENT_OR_PROCEDURE_CALL_STATEMENT ::= name ASSIGNEMENT_OR_PROCEDURE_CALL_END_STATEMENT
*/
static boolean ASSIGNEMENT_OR_PROCEDURE_CALL_STATEMENT() {
if (current_symbol.code != ID_TOKEN) return false;
/* Checking of the current identifier is a constant */
if (is_current_symbol_const()) raise_error(ASSIGNEMENT_TO_CONST_ERROR);
_pseudo_code_add_inst(LDA, get_address());
int s = get_symbol_start();
int e = get_symbol_end();
next_symbol();
if (current_symbol.code == OPEN_PARENTHESIS_TOKEN) {
next_symbol();
if (current_symbol.code == INTEGER_TOKEN) {
_pseudo_code_add_inst(LDI, atoi(current_symbol.word) - s);
} else if (current_symbol.code == ID_TOKEN) {
_pseudo_code_add_inst(LDA, get_address());
_pseudo_code_add_inst(LDV, 0);
_pseudo_code_add_inst(LDI, s);
_pseudo_code_add_inst(SUB, 0);
}
_pseudo_code_add_inst(ADD, 0);
next_symbol();
if (current_symbol.code != CLOSE_PARENTHESIS_TOKEN) raise_error(PF_EXPECTED_ERROR);
next_symbol();
}
if (!ASSIGNEMENT_OR_PROCEDURE_CALL_END_STATEMENT()) raise_error(ASSIGNEMENT_OR_PROCEDURE_CALL_END_STATEMENT_ERROR);
return true;
}
/**
* ASSIGNEMENT_OR_PROCEDURE_CALL_END_STATEMENT ::= ASSIGNEMENT_STATEMENT | PROCEDURE_CALL_STATEMENT
*/
static boolean ASSIGNEMENT_OR_PROCEDURE_CALL_END_STATEMENT() {
if (ASSIGNEMENT_STATEMENT()) {
return true;
} else if (PROCEDURE_CALL_STATEMENT())
return true;
else
return false;
}
/**
* ASSIGNEMENT_STATEMENT ::= := EXPRESSION
*/
static boolean ASSIGNEMENT_STATEMENT() {
// Reaading the affectation symbol
if (current_symbol.code != AFFECTATION_TOKEN)
return false;
next_symbol();
// Reading an expression
if(!EXPRESSION())
raise_error(EXPRESSION_ERROR);
_pseudo_code_add_inst(STO, 0);
if (current_symbol.code != SEMICOLON_TOKEN)
raise_error(SEMICOLON_EXPECTED_ERROR);
next_symbol();
return true;
}
static boolean PROCEDURE_CALL_STATEMENT() {
if (current_symbol.code != SEMICOLON_TOKEN)
return false;
_pseudo_code_add_inst(JSR, 0);
next_symbol();
return true;
}
/**
* EXIT_STATEMENT ::= exit [LOOP_NAME] [when CONDITION];
*/
static boolean EXIT_STATEMENT() {
// Reading the exit keyword
if (current_symbol.code != EXIT_TOKEN) return false;
next_symbol();
// Checking if there is a loop name and reading it
if (current_symbol.code == ID_TOKEN) next_symbol();
// Checking if there is a when + condition
if (current_symbol.code == WHEN_TOKEN) {
next_symbol();
if(!CONDITION()) raise_error(CONDITION_ERROR);
_pseudo_code_add_inst(NBZ,-1);
}
if (current_symbol.code != SEMICOLON_TOKEN) raise_error(SEMICOLON_EXPECTED_ERROR);
next_symbol();
return true;
}
/**
* IO_STATEMENT ::= WRITE_STATEMENT | READ_STATEMENT
*/
static boolean IO_STATEMENT() {
if (WRITE_STATEMENT()) return true;
else if (READ_STATEMENT()) return true;
return false;
}
/**
* WRITE_STATEMENT ::= Put(EXPRESSION);
*/
static boolean WRITE_STATEMENT() {
current_expression_type = TVAR;
if (current_symbol.code != PUT_TOKEN) return false;
next_symbol();
if (current_symbol.code != OPEN_PARENTHESIS_TOKEN) raise_error(PO_EXPECTED_ERROR);
next_symbol();
if (current_symbol.code == STRING_TOKEN){
/*
* Here we want to print strings into the screen
*/
int s = strlen(current_symbol.word) - 1;
/* Loading the string ito the memory */
for (int i = 1; i < s; i++) {
_pseudo_code_add_inst(LDI, (int) current_symbol.word[i]);
_pseudo_code_add_inst(PRC, 0);
}
next_symbol();
} else if (current_symbol.code == CHAR_TOKEN) {
/*
* Here we want to print ot the screen a character
*/
if (current_symbol.word[1] == '\\') {
/* It's a special character */
char to_print;
switch (current_symbol.word[2]) {
case 'n':
to_print = '\n';
break;
case 't':
to_print = '\t';
break;
default:
to_print = '\n';
break;
}
_pseudo_code_add_inst(LDI, to_print);
} else {
/* It's not a special character */
_pseudo_code_add_inst(LDI, current_symbol.word[1]);
}
_pseudo_code_add_inst(PRC, 0);
next_symbol();
} else {
if (!EXPRESSION()) raise_error(SIMPLE_EXPRESSION_ERROR);
/* Choosing which insctruction to use based on type */
if (current_expression_type == TINT) _pseudo_code_add_inst(PRI, 0);
else if (current_expression_type == TCHR) _pseudo_code_add_inst(PRC, 0);
else _pseudo_code_add_inst(PRF, 0);
}
if (current_symbol.code != CLOSE_PARENTHESIS_TOKEN) raise_error(PF_EXPECTED_ERROR);
next_symbol();
if (current_symbol.code != SEMICOLON_TOKEN) raise_error(SEMICOLON_EXPECTED_ERROR);
next_symbol();
return true;
}
/**
* READ_STATEMENT ::= Get(EXPRESSION);
*/
static boolean READ_STATEMENT() {
if (current_symbol.code != GET_TOKEN) return false;
next_symbol();
if (current_symbol.code != OPEN_PARENTHESIS_TOKEN) raise_error(PO_EXPECTED_ERROR);
next_symbol();
if (current_symbol.code != ID_TOKEN) raise_error(IDENTIFIER_EXPECTED_ERROR);
_pseudo_code_add_inst(LDA, get_address());
int s = get_symbol_start();
int e = get_symbol_end();
next_symbol();
if (current_symbol.code == OPEN_PARENTHESIS_TOKEN) {
next_symbol();
if (current_symbol.code == INTEGER_TOKEN) {
_pseudo_code_add_inst(LDI, atoi(current_symbol.word) - s);
} else if (current_symbol.code == ID_TOKEN) {
_pseudo_code_add_inst(LDA, get_address());
_pseudo_code_add_inst(LDV, 0);
_pseudo_code_add_inst(LDI, s);
_pseudo_code_add_inst(SUB, 0);
}
_pseudo_code_add_inst(ADD, 0);
next_symbol();
if (current_symbol.code != CLOSE_PARENTHESIS_TOKEN) raise_error(PF_EXPECTED_ERROR);
next_symbol();
}
_pseudo_code_add_inst(RDF, 0);
_pseudo_code_add_inst(STO, 0);
if (current_symbol.code != CLOSE_PARENTHESIS_TOKEN) raise_error(PF_EXPECTED_ERROR);
next_symbol();
if (current_symbol.code != SEMICOLON_TOKEN) raise_error(SEMICOLON_EXPECTED_ERROR);
next_symbol();
return true;
}
/*
* SIMPLE_RETURN_STATEMENT ::= return [EXPRESSION] ;
*/
static boolean SIMPLE_RETURN_STATEMENT() {
if (current_symbol.code != RETURN_TOKEN) return false;
next_symbol();
EXPRESSION();
if (current_symbol.code != SEMICOLON_TOKEN) raise_error(SEMICOLON_EXPECTED_ERROR);
next_symbol();
return true;
}
/*
* IF_STATEMENT ::= if CONDITION then SEQUENCE_OF_STATEMENT {elseif CONDITION then SEQUENCE_OF_STATEMENT} [else SEQUENCE_OF_STATEMENT] end if;
*/
static boolean IF_STATEMENT(){
//int indice_brn;
if(current_symbol.code!=IF_TOKEN) return false;
next_symbol();
if(!CONDITION()){
raise_error(CONDITION_ERROR);
}
_pseudo_code_add_inst(BZE, -1);
if(current_symbol.code!=THEN_TOKEN) raise_error(THEN_EXPECTED_ERROR);
next_symbol();
if(!SEQUENCE_OF_STATEMENT()){
raise_error(SEQUENCE_STATEMENT_ERROR);
}
_pseudo_code_add_inst(BRN,-1);
_pseudo_code_fix_bze();//Mery
int counter = 1;
// {else if CONDITION then SEQUENCE_OF_STATEMENT}
while(current_symbol.code==ELSIF_TOKEN){
counter++;
//indice_brn = line_number;
next_symbol();
if(!CONDITION()){
raise_error(CONDITION_ERROR);
}
_pseudo_code_add_inst(BZE, -1);
if(current_symbol.code!=THEN_TOKEN)
raise_error(THEN_EXPECTED_ERROR);
next_symbol();
if(!SEQUENCE_OF_STATEMENT()){
raise_error(SEQUENCE_STATEMENT_ERROR);
}
_pseudo_code_add_inst(BRN,-1);
_pseudo_code_fix_bze();//Mery
}
if(current_symbol.code == ELSE_TOKEN) {
next_symbol();
if(!SEQUENCE_OF_STATEMENT()){
raise_error(SEQUENCE_STATEMENT_ERROR);
}
}
if(current_symbol.code!=END_TOKEN)
raise_error(END_EXPECTED_ERROR);
next_symbol();
if(current_symbol.code!=IF_TOKEN)
raise_error(IF_EXPECTED_ERROR);
next_symbol();
if(current_symbol.code!=SEMICOLON_TOKEN)
raise_error(SEMICOLON_EXPECTED_ERROR);
//Mery
for (int i = 0; i < counter; i++) _pseudo_code_fix_brn();
//indice_brn = line_number;
next_symbol();
return true;
}