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ParseTree.c
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ParseTree.c
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#include "Vyion.h"
/* Create a general empty parse tree of a certain type */
VyParseTree* MakeParseTree(int type){
VyParseTree* tree = malloc(sizeof(VyParseTree));
tree->type = type;
tree->data = malloc(sizeof(tree_node_data));
tree->pos = NULL;
return tree;
}
/* Create a list */
VyParseTree* MakeListTree(){
VyParseTree* list = MakeParseTree(TREE_LIST);
list->data->list.length = 0;
list->data->list.list = NULL;
return list;
}
/* Create a number */
VyParseTree* MakeNum(){
VyParseTree* num = MakeParseTree(TREE_NUM);
return num;
}
/* Create a string */
VyParseTree* MakeString(){
VyParseTree* str = MakeParseTree(TREE_STR);
return str;
}
/* Create an ident */
VyParseTree* MakeIdent(){
VyParseTree* ident = MakeParseTree(TREE_IDENT);
return ident;
}
/* Put something in a quote */
VyParseTree* Quote(VyParseTree* elem){
/* The resulting list, (quote ...) */
VyParseTree* qList = MakeListTree();
/* The quote ident */
VyParseTree* qIdent = MakeIdent();
SetStrData(qIdent, "quote");
/* Add to the list */
AddToList(qList, qIdent);
AddToList(qList, elem);
return qList;
}
/* Find out if a list is a quote list */
int IsQuote(VyParseTree* qt){
/* It must be a list with two elements to be a quote */
if(qt->type == TREE_LIST){
if(ListTreeSize(qt) == 2){
/* And the first element must be the quote ident */
if(GetListData(qt,0)->type == TREE_IDENT && strcmp(GetStrData(GetListData(qt, 0)), "quote") == 0){
return 1;
}
}
}
/* Assume false otherwise */
return 0;
}
/* Put something in a substitution */
VyParseTree* Substitution(VyParseTree* elem, int splice){
/* The resulting list, (quote ...) */
VyParseTree* sList = MakeListTree();
/* The quote ident */
VyParseTree* sIdent = MakeIdent();
if(splice){
SetStrData(sIdent, "splicing-substitution");
}else{
SetStrData(sIdent, "substitution");
}
/* Add to the list */
AddToList(sList, sIdent);
AddToList(sList, elem);
return sList;
}
/* Find out if a list is a substitution list */
int IsSubstitution(VyParseTree* qt){
/* Same rules apply as for IsQuote, except the ident is different */
if(qt->type == TREE_LIST){
if(ListTreeSize(qt) == 2){
if(GetListData(qt,0)->type == TREE_IDENT){
char* str = GetStrData(GetListData(qt, 0));
if(strcmp(str, "substitution") == 0 || strcmp(str, "splicing-substitution") == 0){
return 1;
}
}
}
}
/* Assume false otherwise */
return 0;
}
/* Find whether it is a splicing substitution */
int IsSplicingSubstitution(VyParseTree* subst){
if(IsSubstitution(subst)
&& strcmp(GetStrData(GetListData(subst, 0)), "splicing-substitution") == 0){
return 1;
}
return 0;
}
/* Create a reference */
VyParseTree* Reference(VyParseTree* obj, VyParseTree* ref){
VyParseTree* tree = MakeParseTree(TREE_REF);
tree->type = TREE_REF;
tree->data->ref.obj = obj;
tree->data->ref.ref= ref;
return tree;
}
/* Make an error node */
VyParseTree* ParseError(char* message){
VyParseTree* error = MakeParseTree(TREE_ERROR);
error->data->error.message = message;
return error;
}
/* Find the obj or ref parts of the reference */
inline VyParseTree* GetObj(VyParseTree* ref){
return ref->data->ref.obj;
}
inline VyParseTree* GetRef(VyParseTree* ref){
return ref->data->ref.ref;
}
/* Find the size of a list tree */
inline int ListTreeSize(VyParseTree* tree){
return tree->data->list.length;
}
/* Add to a list and return it's size */
int AddToList(VyParseTree* tree, VyParseTree* item){
/* If it isn't a list, return 0 */
if(tree->type != TREE_LIST){
return 0;
}
/* Allocate more memory and add the item */
tree->data->list.list = realloc(tree->data->list.list, sizeof(VyParseTree*)*(ListTreeSize(tree)+ 1));
tree->data->list.list[ListTreeSize(tree)] = item;
/* Increment the list's size */
tree->data->list.length++;
return 1;
}
/* Get data from a list */
VyParseTree* GetListData(VyParseTree* tree, int index){
return tree->data->list.list[index];
}
/* Get the first element of a list */
VyParseTree* ListTreeHead(VyParseTree* list){
/* Validate that it is a list and has at least one element */
if(list->type != TREE_LIST && ListTreeSize(list) > 0){
return NULL;
}
else{
return GetListData(list, 0);
}
}
/* Set or fetch string data for ident nodes */
int SetStrData(VyParseTree* tree, char* str){
/* Make sure it has an appropriate type */
switch(tree->type){
case TREE_IDENT:
tree->data->ident.str = strdup(str);
return 1;
case TREE_STR:
tree->data->str.str = strdup(str);
return 1;
default:
return 0;
}
}
char* GetStrData(VyParseTree* tree){
/* Make sure it has an appropriate type */
switch(tree->type){
case TREE_IDENT:
return tree->data->ident.str;
case TREE_STR:
return tree->data->str.str;
default:
return NULL;
}
}
/* Get and set number data */
void SetNumberData(VyParseTree* tree, VyNumber** num){
if(tree->type == TREE_NUM){
tree->data->num.num = num;
}
}
VyNumber** GetNumberData(VyParseTree* tree){
if(tree->type == TREE_NUM){
return tree->data->num.num;
}else{
return NULL;
}
}
/* Set the position */
void SetPosition(VyParseTree* tree, Position* pos){
/* Copy all the position data */
if(tree->pos == NULL) {
tree->pos = malloc(sizeof(Position));
tree->pos->line = pos->line;
tree->pos->indent = pos->indent;
tree->pos->character = pos->character;
}
}
/* Delete a parse tree */
void DeleteParseTree(VyParseTree* tree){
/* Make sure you aren't freeing null pointers */
if(tree != NULL){
if(tree->data != NULL){
/* Free all the sub-trees depending on the type */
int treeType = tree->type;
/* For identifiers the only associated data to free is the string data */
if(treeType == TREE_IDENT){
free(tree->data->ident.str);
}
/* For lists, free all the members of the list */
else if(treeType == TREE_LIST){
/* Iterate through and free all the elements */
int i;
for(i = 0; i < ListTreeSize(tree); i++){
VyParseTree* next = GetListData(tree,i);
DeleteParseTree(next);
}
/* Free the used array */
free(tree->data->list.list);
}
/* For references, free both parts of the reference */
else if(treeType == TREE_REF){
DeleteParseTree(GetObj(tree));
DeleteParseTree(GetRef(tree));
}
/* Finally, free the rest of the tree and the data*/
free(tree->data);
}
/* Free the position data */
if(tree->pos != NULL){
free(tree->pos);
}
free(tree);
}
}