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wordlib.c
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wordlib.c
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#include "wordlib.h"
#include<stdio.h>
#include<stdlib.h>
#include<stdio.h>
#include<string.h>
const char* const keyWords[] = {".", "EMIT", "WORD", "VARIABLE", "!", "@", "IF", "ELSE", "THEN", "+",
"-", ">", ">=", "<", "<=", "==", "!=", "WHILE", "ENDWHILE", ";",
":", "DUP", "SWAP", "OVER", "DEPTH"};
void (* const funptrs[])(context_t*) = {&print, &printAscii, &getInput, &createVar, &storeAt, &fetch, &conditional,
&condElse, &then, &addition, &subtraction, &greaterThan, &greaterEqualThan, &lessThan, &lessEqualThan,
&equals, ¬Equals, &whileLoop, &endWhile, &endUserDefinedWord, &createUserDefinedWord, &duplicate, &swap, &over, &depth};
const int numKeyWords = 25;
void print(context_t *context) { //.
long int x = popLong(context->stack);
printf("%ld", x);
}
void printAscii(context_t *context) { //EMIT
long int x = popLong(context->stack) % 0x100; //printable range
char c = (char) x;
char str[2] = {c, 0};
//printf("%c", x);
printf("%s", str);
}
void getInput(context_t *context) { //WORD
long int x;
scanf("%ld", &x); //Need to figure out how to handle conversion errors
pushLong(x, context->stack);
}
void createVar(context_t *context) { //VARIABLE <type>. No scoping yet. Consumes 2 tokens.
goNext(context); //Get the type
char* name = context->executionPoint;
addToVarList(context->globals, context->executionPoint, context->currentLen, 0); //For now variables are zero-initialized.
}
void varName(context_t *context) {
long int *x = find(context->globals, context->executionPoint, context->currentLen);
char* appendTo = "";
if(x == NULL){
printf("%s is not a word or a variable.", strncat(appendTo, (context->executionPoint), context->currentLen));
//TODO: Stop execution
return;
}
pushAddr(x, context->stack);
}
void freeMemory(context_t *context) {
long int* loc = popAddr(context->stack);
free(loc);
}
void storeAt(context_t *context) { // !
if(context->stack->size < 2){
printf("Runtime Error: Stack underflow.");
return;
}
long int* loc = popAddr(context->stack);
long int val = popLong(context->stack);
*loc = val;
}
void fetch(context_t *context) { // @
long int* addr = popAddr(context->stack);
pushLong(*addr, context->stack);
}
void conditional(context_t *context) { // IF
long int truthValue = popLong(context->stack);
int thensToFind = 1; //Number of THEN's we need to find.
char* blockReturn = NULL;
char* elseReturn = NULL;
char* lookAt = (context->executionPoint) + (context->currentLen) + 1;
pushLong(0, context->conditionalStack); //The if which is the subject of this function call
while(context->conditionalStack->size > 0) {
if(strncmp(lookAt, "IF ", 3) == 0) {
pushLong(0, context->conditionalStack);
}
else if(strncmp(lookAt, "ELSE ", 5) == 0) {
if(context->conditionalStack->size == 1){
elseReturn = lookAt;
}
pushLong(1, context->conditionalStack);
}
else if(strncmp(lookAt, "THEN ", 5) == 0) {
long int isElse = popLong(context->conditionalStack); // BUG ?
if(isElse){
popLong(context->conditionalStack);
}
if(context->conditionalStack->size == 0){
blockReturn = lookAt;
}
}
lookAt = lookAhead(context, lookAt, 1);
}
if(truthValue){
pushString(blockReturn, context->addressStack);
}
else {
if(elseReturn == NULL){
context->executionPoint = blockReturn;
//context->currentLen = 4; //might remove
}
else {
context->executionPoint = elseReturn;
pushString(blockReturn, context->addressStack);
//context->currentLen = 4; //might remove
}
}
}
void condElse(context_t *context) {//ELSE
//This word is only executed when an IF condition is true - terminates the IF-part of the code.
//context->executionPoint = popString(context->addressStack);
context->executionPoint = (context->addressStack->top->data).word;
}
void then(context_t *context) { //THEN
popString(context->addressStack);
}
void addition(context_t *context) {
if(context->stack->size < 2){
printf("Runtime Error: Stack underflow.");
return;
}
long int arg2 = popLong(context->stack);
long int arg1 = popLong(context->stack);
pushLong(arg1 + arg2, context->stack);
}
void subtraction(context_t *context) { // -
if(context->stack->size < 2){
printf("Runtime Error: Stack underflow.");
return;
}
long int arg2 = popLong(context->stack);
long int arg1 = popLong(context->stack);
//printf("Arg 1 is %ld, Arg 2 is %ld\n", arg1, arg2);
pushLong(arg1 - arg2, context->stack);
}
void greaterThan(context_t *context) {
if(context->stack->size < 2){
printf("Runtime Error: Stack underflow.");
return;
}
long int arg2 = popLong(context->stack);
long int arg1 = popLong(context->stack);
if(arg1 > arg2){
pushLong(1, context->stack);
}
else pushLong(0, context->stack);
}
void greaterEqualThan(context_t *context) {
if(context->stack->size < 2){
printf("Runtime Error: Stack underflow.");
return;
}
long int arg2 = popLong(context->stack);
long int arg1 = popLong(context->stack);
if(arg1 >= arg2) pushLong(1, context->stack);
else pushLong(0, context->stack);
}
void lessThan(context_t *context) {
if(context->stack->size < 2){
printf("Runtime Error: Stack underflow.");
return;
}
long int arg2 = popLong(context->stack);
long int arg1 = popLong(context->stack);
if(arg1 < arg2) pushLong(1, context->stack);
else pushLong(0, context->stack);
}
void lessEqualThan(context_t *context) {
if(context->stack->size < 2){
printf("Runtime Error: Stack underflow.");
return;
}
long int arg2 = popLong(context->stack);
long int arg1 = popLong(context->stack);
if(arg1 <= arg2) pushLong(1, context->stack);
else pushLong(0, context->stack);
}
void equals(context_t *context) {
if(context->stack->size < 2){
printf("Runtime Error: Stack underflow.");
return;
}
long int arg2 = popLong(context->stack);
long int arg1 = popLong(context->stack);
if(arg1 == arg2) pushLong(1, context->stack);
else pushLong(0, context->stack);
}
void notEquals(context_t *context) {
if(context->stack->size < 2){
printf("Runtime Error: Stack underflow.");
return;
}
long int arg2 = popLong(context->stack);
long int arg1 = popLong(context->stack);
if(arg1 != arg2) pushLong(1, context->stack);
else pushLong(0, context->stack);
}
void whileLoop(context_t *context) { //WHILE
long int truthValue = popLong(context->stack);
int numWhiles = 1;
char* lookAt = (context->executionPoint) + (context->currentLen) + 1;
while(numWhiles > 0){
if(strncmp(lookAt, "WHILE ", 6) == 0){
numWhiles++;
}
else if (strncmp(lookAt, "ENDWHILE ", 9) == 0){
numWhiles--;
}
lookAt = lookAhead(context, lookAt, 1);
}
char* endPoint = lookAt - 9;
if(truthValue){
pushString(context->executionPoint, context->addressStack); //push the beginning of loop body to the stack
}
else {
context->executionPoint = endPoint;
}
}
void endWhile(context_t *context) { //ENDWHILE
//The user should always push the truth value right before ENDWHILE
long int truthValue = popLong(context->stack);
if(truthValue){
context->executionPoint = (context->addressStack->top->data).word;
}
else {
popString(context->addressStack);
}
}
void duplicate(context_t* context){//DUP
pushElement(context->stack->top, context->stack);
}
void swap(context_t* context){ //SWAP
stackElement_t* temp = malloc(sizeof(stackElement_t));
temp->data = context->stack->top->data;
context->stack->top->data = context->stack->top->next->data;
context->stack->top->next->data = temp->data;
free(temp);
}
int isNumber(context_t *context) {
char* word = context->executionPoint;
if(context->currentLen == 0){
//Cannot have numbers of length zero.
return 0;
}
for(int i = 0; i < context->currentLen; i++){
char c = *(word + i);
if(c < 48 || c > 57){
if(i == 0 && c == '-' && *(word + 1) != ' ') continue;
else return 0;
}
}
return 1;
}
int ipow(int base, int exp) {
int result = 1;
for (;;)
{
if (exp & 1)
result *= base;
exp >>= 1;
if (!exp)
break;
base *= base;
}
return result;
}
long int parseLong(context_t *context) {
long int num = 0;
for(int i = 0; i < context->currentLen; i++){
if(*(context->executionPoint) == '-'){
if(i == 0) continue;
num *= 10;
num -= (*(context->executionPoint + i) - '0');
//num -= (*(context->executionPoint + i) - '0') * ipow(10, context->currentLen - i - 2);
}
else {
//num += (*(context->executionPoint + i) - '0') * ipow(10, context->currentLen - i - 1);
num *= 10;
num += *(context->executionPoint + i) - '0';
}
}
return num;
}
int isKeyWord(context_t *context) {
for(int i = 0; i < numKeyWords; i++){
if(strncmp(context->executionPoint, keyWords[i], context->currentLen) == 0){
return i;
}
}
return -1;
}
int isUserDefinedWord(context_t *context) {
if(findFunc(context->customWords, context->executionPoint, context->currentLen) != NULL){
return 1;
}
else {
return 0;
}
}
int isVariable(context_t *context) {
if(find(context->globals, context->executionPoint, context->currentLen) != NULL){
return 1;
}
else {
return 0;
}
}
int execute(context_t *context) {
//printf("Current len is %d\n", context->currentLen);
//printf(context->executionPoint); printf("\n");
if (*(context->executionPoint) == 0){
printf(" ok\n");
return -1;
}
else if((*(context->executionPoint) == ' ') || (*(context->executionPoint) == '\n')){ //TODO: necessary?
/*if(*(context->executionPoint) == '\n'){
printf("newline");
}*/
(context->executionPoint)++;
return 8;
}
if(isNumber(context)){
pushLong(parseLong(context), context->stack);
goNext(context);
//printf("Is Number!\n");
return 7;
}
else{
int j = isKeyWord(context);
long int* var = find(context->globals, context->executionPoint, context->currentLen);
//printf("The value of j is %d\n", j);
func_t* k = findFunc(context->customWords, context->executionPoint, context->currentLen);
//printf("The value of k is %p\n", k);
if(j != -1){
funptrs[j](context);
goNext(context);
//printf("Keyword!\n");
//printf("%s", context->executionPoint); printf("\n");
return 0;
}
else if (var != NULL){
pushAddr(var, context->stack);
goNext(context);
return 2;
}
else if ( k != NULL){
pushString(context->executionPoint, context->addressStack);
context->executionPoint = k->location;
context->currentLen = getCurrentLen(context->executionPoint);
return 1;
}
else {
printf("Unrecognized word at:%s\n", context->executionPoint);
return -1;
}
}
}
void createUserDefinedWord(context_t *context) { // :
goNext(context);
int i = isNumber(context);
int j = isVariable(context);
int k = isKeyWord(context) != -1;
int l = isUserDefinedWord(context);
if(i || k || j || l){
printf("Illegal user-defined word type.\n");
return;
}
else {
addToFuncList(context->customWords, context->executionPoint, context->currentLen,
context->executionPoint + context->currentLen + 1);
}
while(strncmp(context->executionPoint, "; ", 2) != 0){
goNext(context);
}
}
void endUserDefinedWord(context_t *context) { // ;
context->executionPoint = popString(context->addressStack);
context->currentLen = getCurrentLen((context->executionPoint));
}
void over(context_t *context) { //OVER
pushElement(context->stack->top->next, context->stack);
}
void depth(context_t* context){ //DEPTH
pushLong(context->stack->size, context->stack);
}
void defineStruct(context_t* context){ // STRUCT
goNext(context);
struct_t* s;
int i = isNumber(context);
int j = isVariable(context);
int k = isKeyWord(context) != -1;
int l = isUserDefinedWord(context);
if(i || j || k || l){
printf("Illegal struct type.");
return; //TODO: consume tokens until struct is terminated
}
else {
s = addToStructList(context->customStructs, context->executionPoint, context->currentLen);
}
while(strncmp(context->executionPoint, "; ", 2) != 0){
goNext(context);
}
}
void instantiateStruct(context_t* context){ //MKSTRUCT
}
int isStruct(context_t* context){
struct_t* s = findStruct(context->customStructs, context->executionPoint, context->currentLen);
}