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parser.c
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#include <stdio.h>
#include <stdbool.h>
#include "lexer.c"
typedef struct ast{
tkn token;
struct ast *root;
struct ast *child;
struct ast *sibling;
struct ast *past_sibling;
bool visited;
} ast;
FILE *file;
char number_string[10000];
typedef enum non_terminal{
PROGRAM_SYMBOL,
FUNCTION_SYMBOL,
STATEMENT_SYMBOL,
DECLARATION_SYMBOL,
BLOCK_ITEM_SYMBOL,
EXPRESSION_SYMBOL,
EXPRESSION_OPTION_SYMBOL,
CONDITIONAL_EXPRESSION_SYMBOL,
LOGICAL_OR_EXPRESSION_SYMBOL,
LOGICAL_AND_EXPRESSION_SYMBOL,
EQUALITY_EXPRESSION_SYMBOL,
RELATIONAL_EXPRESSION_SYMBOL,
ADDITIVE_EXPRESSION_SYMBOL,
TERM_SYMBOL,
FACTOR_SYMBOL,
FUNCTION_CALL_SYMBOL
} non_terminal;
typedef struct parse_return{
bool valid;
tkn_list *token_list;
ast* root;
} parse_return;
ast* initialise_child(ast *root, tkn token){
root->child = (ast *)malloc(sizeof(ast));
root->child->root = root;
root->child->child = NULL;
root->child->sibling = NULL;
root->child->visited = false;
root->child->past_sibling = NULL;
root->child->token = token;
return root->child;
}
ast* initialise_sibling(ast *node, tkn token){
node->sibling = (ast *)malloc(sizeof(ast));
node->sibling->root = node->root;
node->sibling->child = NULL;
node->sibling->sibling = NULL;
node->sibling->visited = false;
node->sibling->past_sibling = node;
node->sibling->token = token;
return node->sibling;
}
str declared_variables[10000];
int local_variable_byte_count = 0;
int else_count = 0;
int for_count = 0;
int while_count = 0;
int do_while_count = 0;
int local_variable_count = 0;
int and_total_count = 0;
int or_total_count = 0;
bool is_name_equal(str name1, str name2){
bool equal = true;
if (name1.character != name2.character){
return false;
}
while (name1.pointer != NULL & name2.pointer != NULL & equal){
if (name1.character==name2.character){
name1 = *name1.pointer;
name2 = *name2.pointer;
}
else{
equal = false;
}
}
if (equal){
if (name1.character == name2.character){
if (name1.pointer != NULL & name2.pointer == NULL){
equal = false;
}
if (name1.pointer == NULL & name2.pointer != NULL){
equal = false;
}
}
else{
return false;
}
}
return equal;
}
bool is_declared(str name){
for (int i = 0; i<local_variable_count;i++){
if (is_name_equal(name, declared_variables[i])){
return true;
}
}
return false;
}
parse_return parse(tkn_list *token_list, non_terminal symbol, ast *root){
ast *node;
node = (ast *)malloc(sizeof(ast));
tkn function;
function.type = FUNCTION;
tkn expression;
expression.type = EXPRESSION;
tkn expression_option;
expression_option.type = EXPRESSION_OPTION;
tkn declaration;
declaration.type = DECLARATION;
tkn block_item;
block_item.type = BLOCK_ITEM;
tkn logical_or_expression;
logical_or_expression.type = LOGICAL_OR_EXPRESSION;
tkn conditional_expression;
conditional_expression.type = CONDITIONAL_EXPRESSION;
tkn logical_and_expression;
logical_and_expression.type = LOGICAL_AND_EXPRESSION;
tkn equality_expression;
equality_expression.type = EQUALITY_EXPRESSION;
tkn relational_expression;
relational_expression.type = RELATIONAL_EXPRESSION;
tkn additive_expression;
additive_expression.type = ADDITIVE_EXPRESSION;
tkn statement;
statement.type = STATEMENT;
tkn factor;
factor.type = FACTOR;
tkn function_call;
function_call.type = FUNCTION_CALL;
tkn term;
term.type = TERM;
parse_return return_value;
switch (symbol)
{
case PROGRAM_SYMBOL:
file = fopen("assembly.s", "w");
if (token_list!=NULL && token_list->pointer == NULL && token_list->token.type!=SEMICOLON){
fputs("Invalid token order [Ln ", file);
sprintf(number_string, "%d", token_list->token.line_index);
fputs(number_string, file);
fputs(", Col ", file);
sprintf(number_string, "%d", token_list->token.character_index);
fputs(number_string, file);
fputs("]\n", file);
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
if (token_list->pointer != NULL && token_list->pointer->pointer != NULL && token_list->pointer->pointer->token.type == OPEN_PARENTHESES){
node = initialise_child(root, function);
return_value = parse(token_list, FUNCTION_SYMBOL, node);
if (!return_value.valid){
fputs("Invalid token order [Ln ", file);
sprintf(number_string, "%d", return_value.token_list->token.line_index);
fputs(number_string, file);
fputs(", Col ", file);
sprintf(number_string, "%d", return_value.token_list->token.character_index);
fputs(number_string, file);
fputs("]\n", file);
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
token_list = return_value.token_list;
}
else if (token_list->pointer != NULL){
node = initialise_child(root, declaration);
return_value = parse(token_list, DECLARATION_SYMBOL, node);
if (!return_value.valid){
fputs("Invalid token order [Ln ", file);
sprintf(number_string, "%d", return_value.token_list->token.line_index);
fputs(number_string, file);
fputs(", Col ", file);
sprintf(number_string, "%d", return_value.token_list->token.character_index);
fputs(number_string, file);
fputs("]\n", file);
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
token_list = return_value.token_list;
}
while (token_list->pointer != NULL){
if (token_list->pointer->pointer != NULL && token_list->pointer->pointer->token.type == OPEN_PARENTHESES){
node = initialise_sibling(node, function);
return_value = parse(token_list, FUNCTION_SYMBOL, node);
if (!return_value.valid){
fputs("Invalid token order [Ln ", file);
sprintf(number_string, "%d", return_value.token_list->token.line_index);
fputs(number_string, file);
fputs(", Col ", file);
sprintf(number_string, "%d", return_value.token_list->token.character_index);
fputs(number_string, file);
fputs("]\n", file);
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
token_list = return_value.token_list;
}
else{
node = initialise_sibling(node, declaration);
return_value = parse(token_list, DECLARATION_SYMBOL, node);
if (!return_value.valid){
fputs("Invalid token order [Ln ", file);
sprintf(number_string, "%d", return_value.token_list->token.line_index);
fputs(number_string, file);
fputs(", Col ", file);
sprintf(number_string, "%d", return_value.token_list->token.character_index);
fputs(number_string, file);
fputs("]\n", file);
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
token_list = return_value.token_list;
}
}
return_value.token_list = return_value.token_list;
return_value.valid = true;
return_value.root = root;
return return_value;
break;
case FUNCTION_SYMBOL:
if (token_list->token.type == INT_KEYWORD){
node = initialise_child(root, token_list->token);
token_list = token_list->pointer;
if (token_list->token.type == IDENTIFIER){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
if (token_list->token.type == OPEN_PARENTHESES){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
if (token_list->token.type == INT_KEYWORD){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
if (token_list->token.type == IDENTIFIER){
node = initialise_sibling(node, token_list->token);
if (!is_declared(token_list->token.name)){
local_variable_byte_count += 8;
declared_variables[local_variable_count] = token_list->token.name;
local_variable_count += 1;
}
token_list = token_list->pointer;
while (token_list->token.type == COMMA){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
if (token_list->token.type == INT_KEYWORD){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
if (token_list->token.type == IDENTIFIER){
node = initialise_sibling(node, token_list->token);
if (!is_declared(token_list->token.name)){
local_variable_byte_count += 8;
declared_variables[local_variable_count] = token_list->token.name;
local_variable_count += 1;
}
token_list = token_list->pointer;
}
else{
token_list = token_list;
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
}
else{
token_list = token_list;
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
}
}
else{
token_list = token_list;
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
}
if (token_list->token.type == CLOSED_PARENTHESES){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
if (token_list->token.type == OPEN_BRACE){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
while (token_list->token.type != CLOSED_BRACE) {
node = initialise_sibling(node, block_item);
return_value = parse(token_list, BLOCK_ITEM_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
}
else{
token_list = token_list;
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
}
initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
else if (token_list->token.type == SEMICOLON){
initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
}
}
}
}
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
case BLOCK_ITEM_SYMBOL:
if (token_list->token.type == INT_KEYWORD){
node = initialise_child(root, declaration);
return_value = parse(token_list, DECLARATION_SYMBOL, node);
if (return_value.valid){
return_value.token_list = return_value.token_list;
return_value.valid = true;
return return_value;
break;
}
}
else{
node = initialise_child(root, statement);
return_value = parse(token_list, STATEMENT_SYMBOL, node);
if (return_value.valid){
return_value.token_list = return_value.token_list;
return_value.valid = true;
return return_value;
break;
}
}
return_value.token_list = return_value.token_list;
return_value.valid = false;
return return_value;
break;
case DECLARATION_SYMBOL:
if (token_list->token.type == INT_KEYWORD){
node = initialise_child(root, token_list->token);
token_list = token_list->pointer;
if (token_list->token.type == IDENTIFIER){
if (!is_declared(token_list->token.name)){
local_variable_byte_count += 8;
declared_variables[local_variable_count] = token_list->token.name;
local_variable_count += 1;
}
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
if (token_list->token.type == ASSIGNMENT){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
if (token_list->pointer->token.type != SEMICOLON && root->root->token.type == PROGRAM){
str variable_name = node->past_sibling->token.name;
fputs("Global variable \'", file);
while (variable_name.pointer != NULL){
fputc(variable_name.character, file);
variable_name = *variable_name.pointer;
}
fputc(variable_name.character, file);
fputs("\' initialised with expression, must be integer only", file);
fputs(" [Ln ", file);
sprintf(number_string, "%d", root->token.line_index);
fputs(number_string, file);
fputs(", Col ", file);
sprintf(number_string, "%d", root->token.character_index);
fputs(number_string, file);
fputs("]\n", file);
fclose(file);
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
node = initialise_sibling(node, expression);
return_value = parse(token_list, EXPRESSION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
}
else{
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
}
if (token_list->token.type == SEMICOLON){
initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
}
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
case STATEMENT_SYMBOL:
if (token_list->token.type == RETURN_KEYWORD){
node = initialise_child(root, token_list->token);
token_list = token_list->pointer;
node = initialise_sibling(node, expression);
return_value = parse(token_list, EXPRESSION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
if (token_list->token.type == SEMICOLON){
initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
}
}
else if (token_list->token.type == IF_KEYWORD){
node = initialise_child(root, token_list->token);
token_list = token_list->pointer;
if (token_list->token.type == OPEN_PARENTHESES){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
node = initialise_sibling(node, expression);
return_value = parse(token_list, EXPRESSION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
if (token_list->token.type == CLOSED_PARENTHESES){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
node = initialise_sibling(node, statement);
ast *temp_node = node;
if (token_list->token.type != OPEN_BRACE){
temp_node = node;
tkn new_token;
str new_name;
new_name.character = '{';
new_name.pointer = NULL;
new_token.name = new_name;
new_token.type = OPEN_BRACE;
node = initialise_child(node, new_token);
node = initialise_sibling(node, block_item);
new_name.character = '}';
new_token.name = new_name;
new_token.type = CLOSED_BRACE;
initialise_sibling(node, new_token);
node = initialise_child(node, statement);
}
return_value = parse(token_list, STATEMENT_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
if (token_list->token.type == ELSE_KEYWORD){
node = temp_node;
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
node = initialise_sibling(node, statement);
if (token_list->token.type != OPEN_BRACE){
tkn new_token;
str new_name;
new_name.character = '{';
new_name.pointer = NULL;
new_token.name = new_name;
new_token.type = OPEN_BRACE;
node = initialise_child(node, new_token);
node = initialise_sibling(node, block_item);
new_name.character = '}';
new_token.name = new_name;
new_token.type = CLOSED_BRACE;
initialise_sibling(node, new_token);
node = initialise_child(node, statement);
}
return_value = parse(token_list, STATEMENT_SYMBOL, node);
if (return_value.valid){
return_value.token_list = return_value.token_list;
return_value.valid = true;
return return_value;
break;
}
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
}
}
}
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
else if (token_list->token.type == OPEN_BRACE){
if (token_list->pointer->token.type != CLOSED_BRACE){
node = initialise_child(root, token_list->token);
token_list = token_list->pointer;
while (token_list->token.type != CLOSED_BRACE){
node = initialise_sibling(node, block_item);
return_value = parse(token_list, BLOCK_ITEM_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
}
else{
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
}
initialise_sibling(node, token_list->token);
}
else{
token_list = token_list->pointer;
}
token_list = token_list->pointer;
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
else if (token_list->token.type == FOR_KEYWORD && token_list->pointer != NULL && token_list->pointer->pointer->token.type != INT_KEYWORD){
tkn new_token;
str new_name;
new_name.character = '{';
new_name.pointer = NULL;
new_token.name = new_name;
new_token.type = OPEN_BRACE;
node = initialise_child(root, new_token);
node = initialise_sibling(node, block_item);
new_name.character = '}';
new_token.name = new_name;
new_token.type = CLOSED_BRACE;
initialise_sibling(node, new_token);
node = initialise_child(node, statement);
node = initialise_child(node, token_list->token);
token_list = token_list->pointer;
if (token_list->token.type == OPEN_PARENTHESES){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
node = initialise_sibling(node, expression_option);
return_value = parse(token_list, EXPRESSION_OPTION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
if (token_list->token.type == SEMICOLON){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
node = initialise_sibling(node, expression_option);
return_value = parse(token_list, EXPRESSION_OPTION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
if (token_list->token.type == SEMICOLON){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
node = initialise_sibling(node, expression_option);
return_value = parse(token_list, EXPRESSION_OPTION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
if (token_list->token.type == CLOSED_PARENTHESES){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
node = initialise_sibling(node, statement);
if (token_list->token.type != OPEN_BRACE){
tkn new_token;
str new_name;
new_name.character = '{';
new_name.pointer = NULL;
new_token.name = new_name;
new_token.type = OPEN_BRACE;
node = initialise_child(node, new_token);
node = initialise_sibling(node, block_item);
new_name.character = '}';
new_token.name = new_name;
new_token.type = CLOSED_BRACE;
initialise_sibling(node, new_token);
node = initialise_child(node, statement);
}
return_value = parse(token_list, STATEMENT_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
}
}
}
}
}
}
}
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
else if (token_list->token.type == FOR_KEYWORD && token_list->pointer != NULL && token_list->pointer->pointer->token.type == INT_KEYWORD){
tkn new_token;
str new_name;
new_name.character = '{';
new_name.pointer = NULL;
new_token.name = new_name;
new_token.type = OPEN_BRACE;
node = initialise_child(root, new_token);
node = initialise_sibling(node, block_item);
new_name.character = '}';
new_token.name = new_name;
new_token.type = CLOSED_BRACE;
initialise_sibling(node, new_token);
node = initialise_child(node, statement);
node = initialise_child(node, token_list->token);
token_list = token_list->pointer;
if (token_list->token.type == OPEN_PARENTHESES){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
node = initialise_sibling(node, declaration);
return_value = parse(token_list, DECLARATION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
node = initialise_sibling(node, expression_option);
return_value = parse(token_list, EXPRESSION_OPTION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
if (token_list->token.type == SEMICOLON){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
node = initialise_sibling(node, expression_option);
return_value = parse(token_list, EXPRESSION_OPTION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
if (token_list->token.type == CLOSED_PARENTHESES){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
node = initialise_sibling(node, statement);
if (token_list->token.type != OPEN_BRACE){
tkn new_token;
str new_name;
new_name.character = '{';
new_name.pointer = NULL;
new_token.name = new_name;
new_token.type = OPEN_BRACE;
node = initialise_child(node, new_token);
node = initialise_sibling(node, block_item);
new_name.character = '}';
new_token.name = new_name;
new_token.type = CLOSED_BRACE;
initialise_sibling(node, new_token);
node = initialise_child(node, statement);
}
return_value = parse(token_list, STATEMENT_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
}
}
}
}
}
}
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
else if (token_list->token.type == WHILE_KEYWORD){
node = initialise_child(root, token_list->token);
token_list = token_list->pointer;
if (token_list->token.type == OPEN_PARENTHESES){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
node = initialise_sibling(node, expression);
return_value = parse(token_list, EXPRESSION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
if (token_list->token.type == CLOSED_PARENTHESES){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
node = initialise_sibling(node, statement);
return_value = parse(token_list, STATEMENT_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
}
}
}
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
else if (token_list->token.type == DO_KEYWORD){
node = initialise_child(root, token_list->token);
token_list = token_list->pointer;
node = initialise_sibling(node, statement);
return_value = parse(token_list, STATEMENT_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
if (token_list->token.type == WHILE_KEYWORD){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
if (token_list->token.type == OPEN_PARENTHESES){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
node = initialise_sibling(node, expression);
return_value = parse(token_list, EXPRESSION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
if (token_list->token.type == CLOSED_PARENTHESES){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
if (token_list->token.type == SEMICOLON){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
}
}
}
}
}
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
else if (token_list->token.type == BREAK_KEYWORD){
node = initialise_child(root, token_list->token);
token_list = token_list->pointer;
if (token_list->token.type == SEMICOLON){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
else if (token_list->token.type == CONTINUE_KEYWORD){
node = initialise_child(root, token_list->token);
token_list = token_list->pointer;
if (token_list->token.type == SEMICOLON){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
else{
node = initialise_child(root, expression_option);
return_value = parse(token_list, EXPRESSION_OPTION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
if (token_list->token.type == SEMICOLON){
initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
}
}
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
case EXPRESSION_OPTION_SYMBOL:
if (token_list->token.type == SEMICOLON && root->past_sibling!=NULL && root->past_sibling->token.type == SEMICOLON && root->root->child->token.type == FOR_KEYWORD){
tkn one_token;
str one_str;
one_str.character = '1';
one_str.pointer = NULL;
one_token.name = one_str;
one_token.type = INT_LITERAL;
tkn semicolon_token;
str semicolon_str;
semicolon_str.character = ';';
semicolon_str.pointer = NULL;
semicolon_token.name = semicolon_str;
semicolon_token.type = SEMICOLON;
tkn_list* new_node = (tkn_list*)malloc(sizeof(tkn_list));
tkn_list* new_node_2 = (tkn_list*)malloc(sizeof(tkn_list));
new_node->token = one_token;
new_node->pointer = new_node_2;
new_node_2->token = semicolon_token;
new_node_2->pointer = token_list->pointer;
token_list->pointer = new_node;
token_list = token_list->pointer;
node = initialise_child(root, expression);
return_value = parse(token_list, EXPRESSION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
else if (token_list->token.type == SEMICOLON){
tkn null_token;
null_token.type = NULL_KEYWORD;
initialise_child(root, null_token);
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
else if (token_list->token.type == CLOSED_PARENTHESES && root->past_sibling->token.type == SEMICOLON && root->root->child->token.type == FOR_KEYWORD){
tkn null_token;
null_token.type = NULL_KEYWORD;
initialise_child(root, null_token);
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
else{
node = initialise_child(root, expression);
return_value = parse(token_list, EXPRESSION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
case EXPRESSION_SYMBOL:
if (token_list->pointer != NULL && token_list->pointer->token.type == ASSIGNMENT){
if (token_list->token.type == IDENTIFIER){
node = initialise_child(root, token_list->token);
token_list = token_list->pointer;
if (token_list->token.type == ASSIGNMENT){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
node = initialise_sibling(node, expression);
return_value = parse(token_list, EXPRESSION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
}
}
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
node = initialise_child(root, conditional_expression);
return_value = parse(token_list, CONDITIONAL_EXPRESSION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
case CONDITIONAL_EXPRESSION_SYMBOL:
node = initialise_child(root, logical_or_expression);
return_value = parse(token_list, LOGICAL_OR_EXPRESSION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
if (token_list->token.type == QUESTION_MARK){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
node = initialise_sibling(node, expression);
return_value = parse(token_list, EXPRESSION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
if (token_list->token.type == COLON){
node = initialise_sibling(node, token_list->token);
token_list = token_list->pointer;
node = initialise_sibling(node, conditional_expression);
return_value = parse(token_list, CONDITIONAL_EXPRESSION_SYMBOL, node);
if (return_value.valid){
token_list = return_value.token_list;
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
}
}
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
}
return_value.token_list = token_list;
return_value.valid = true;
return return_value;
break;
}
return_value.token_list = token_list;
return_value.valid = false;
return return_value;
break;
case LOGICAL_OR_EXPRESSION_SYMBOL:
node = initialise_child(root, logical_and_expression);