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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../global/types.h"
#include "../global/util.h"
#define MAXARGS 8
#define MAXFUNCS 2048
#define MAXVARS 8192
int getBuiltIn(char *func, ast_node *node); // checks if a function is built in to zippy
void expressFunction(char *function, ast_node *node); // puts a string into the ast_node struct
ast_node *tokenize(char *input); // does the tokenization
void printAst(ast_node *root); // shows an ast and its sub nodes
int getBuiltIn(char *func, ast_node *node){ // returns NIL when the function doesn't exist
if (strcmp(func, "defun") == 0){
node->func->builtInFunc= DEFUN;
}else if (strcmp(func, "let") == 0){
node->func->builtInFunc = LET;
}else if (strcmp(func, "set") == 0){
node->func->builtInFunc = SET;
}else if (strcmp(func, "if") == 0){
node->func->builtInFunc = IF;
}else if (strcmp(func, "elif") == 0){
node->func->builtInFunc = ELIF;
}else if (strcmp(func, "else") == 0){
node->func->builtInFunc = ELSE;
}else if (strcmp(func, "for") == 0){
node->func->builtInFunc = FOR;
}else if (strcmp(func, "while") == 0){
node->func->builtInFunc = WHILE;
}else if (strcmp(func, "symbol") == 0){
node->func->builtInFunc = SYMBOL;
}else if (strcmp(func, "+") == 0){
node->func->builtInFunc = ADD;
}else if (strcmp(func, "-") == 0){
node->func->builtInFunc = SUB;
}else if (strcmp(func, "*") == 0){
node->func->builtInFunc = MUL;
}else if (strcmp(func, "/") == 0){
node->func->builtInFunc = DIV;
}else if (strcmp(func, "=") == 0){
node->func->builtInFunc = EQ;
}else if (strcmp(func, "!=") == 0){
node->func->builtInFunc = NEQ;
}else if (strcmp(func, ">") == 0){
node->func->builtInFunc = GT;
}else if (strcmp(func, "<") == 0){
node->func->builtInFunc = LT;
}else if (strcmp(func, ">=") == 0){
node->func->builtInFunc = GTEQ;
}else if (strcmp(func, "<=") == 0){
node->func->builtInFunc = LTEQ;
}else if (strcmp(func, "cast") == 0){
node->func->builtInFunc = CAST;
}else if (strcmp(func, "typeof") == 0){
node->func->builtInFunc = TYPEOF;
}else if (strcmp(func, "exit") == 0){
node->func->builtInFunc = EXIT;
}else if (strcmp(func, "return") == 0){
node->func->builtInFunc = RETURN;
}else if (strcmp(func, "write") == 0){
node->func->builtInFunc = WRITE;
}else {
node->func->builtInFunc = NIL;
return -1;
}
return 0;
}
void expressFunction(char *function, ast_node *node){
node->func = CheckedMalloc(sizeof(functionToken));
if ((getBuiltIn(function, node)) == NIL) // non user defined function
node->func->name = function;
}
ast_node *tokenize(char *input){
ast_node *node, *child;
char *exp, *function, **args;
size_t i = 0, argCount = -1;
int depth = 0;
node = CheckedMalloc(sizeof(ast_node));
node->args = CheckedMalloc(sizeof(ast_node) * MAXARGS);
node->literalArgs = CheckedMalloc(sizeof(void *) * MAXARGS);
if (input[i] == '('){
depth = 1;
i++;
exp = CheckedMalloc(strlen(input));
while (depth != 0){
if (input[i] == ' ') argCount++;
if (input[i] == '('){
child = tokenize(&input[i]);
node->args[argCount] = child;
depth++;
} else if (input[i] == ')'){
depth--;
}
exp[i - 1] = input[i];
if (input[i] == '\0'){
fprintf(stderr, "error brace not closed\n");
exit(1);
}
i++;
}
exp[i-2] = '\0';
exp = CheckedRealloc(exp, strlen(exp) + 1);
}else if (input[i] == '"'){
i++;
while (input[i] != '"') i++;
}
i = 0;
function = CheckedMalloc(strlen(exp));
while (exp[i] != ' '){
function[i] = exp[i];
i++;
}
function[i] = '\0';
function = CheckedRealloc(function, i);
expressFunction(function, node);
char *tok, *saveptr, *expptr = exp;
exp = strstr(exp, " ");
tok = strtok_r(exp, " ", &saveptr);
argCount = 0;
depth = 0;
do {
if (node->args[argCount] != NULL){
argCount++;
}
if (tok[0] != '(' && tok[strlen(tok)-1] != ')' && depth == 0){
if (node->args[argCount] == NULL){
node->literalArgs[argCount] = giveType(tok);
}
argCount++;
}
if (tok[0] == '(') depth++;
if (tok[strlen(tok)-1] == ')') depth--;
tok = strtok_r(NULL, " ", &saveptr);
} while (tok != NULL);
free(expptr);
return node;
}
void printAst(ast_node *root){
printf("-----------\n");
if (root->func->builtInFunc == -1) printf("function: %s\n", root->func->name);
else printf("function (built in): %d\n", root->func->builtInFunc);
for (int i = 0; i < MAXARGS + 1; i++){
if (root->args[i] != NULL) printAst(root->args[i]);
else {
if (root->literalArgs[i] != NULL) printf("%s\n", root->literalArgs[i]);
}
}
printf("-----------\n");
}
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