planarbot/sortedmap.c

#include "sortedmap.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
SortedMap * map() {
	SortedMap *this = malloc(sizeof(SortedMap));
	this->type = EMPTY;
	this->key = NULL;
	return this;
}

void * get_map(SortedMap *this, char *key) {
	switch (this->type) {
	case EMPTY:
		return NULL;
	case LEAF:
		if (strcmp(key, this->key) == 0) return this->content.value;
		return NULL;
	case INTERN:
		if (strcmp(key, this->key) <= 0) {
			return get_map(this->content.children.l, key);
		} else {
			return get_map(this->content.children.r, key);
		}
	default:
		return NULL;
	}
}

SortedMap * put_map(SortedMap *this, char *key, void *value) {
	SortedMap *leaf, *intern;
	int cmp = this->key != NULL ? strcmp(key, this->key) : 0;
	switch (this->type) {
	case EMPTY:
		this->type = LEAF;
		this->key = key;
		this->content.value = value;
		return this;
	case LEAF:
		if (cmp == 0) {
			this->content.value = value;
			return this;
		}
		leaf = malloc(sizeof(SortedMap));
		leaf->type = LEAF;
		leaf->key = key;
		leaf->content.value = value;
		intern = malloc(sizeof(SortedMap));
		intern->type = INTERN;
		intern->key = this->key;
		intern->content.children.l = cmp < 0 ? leaf : this;
		intern->content.children.r = cmp < 0 ? this : leaf;
		return intern;
	case INTERN:
		if (cmp <= 0) {
			this->content.children.l = put_map(this->content.children.l, key, value);
			return this;
		} else {
			this->content.children.r = put_map(this->content.children.r, key, value);
			return this;
		}
	default:
		return NULL;
	}
}

void print_indent_(int indent) {
	int i;
	for(i = 0; i < indent; i++) printf("  ");
}

void print_map_(SortedMap *this, int indent) {
	switch (this->type) {
	case EMPTY:
		printf("empty\n");
		break;
	case LEAF:
		print_indent_(indent);
		printf("%s: %s\n", this->key, (char *) this->content.value);
		break;
	case INTERN:
		print_map_(this->content.children.r, indent + 1);
		print_indent_(indent);
		printf("%s\n", this->key);
		print_map_(this->content.children.l, indent + 1);
		break;
	}
}

void print_map(SortedMap *this) {
	print_map_(this, 0);
}

void * fold_map(SortedMap *this, void * init, void * (*f)(void * acc, char *key, void *value)) {
	switch (this->type) {
	case EMPTY:
		return init;
	case LEAF:
		return f(init, this->key, this->content.value);
	case INTERN:
		return fold_map(this->content.children.r, fold_map(this->content.children.l, init, f), f);
	default:
		return NULL;
	}
}

void free_mapvalues(SortedMap *this) {
	switch (this->type) {
	case EMPTY:
		break;
	case LEAF:
		free(this->content.value);
		break;
	case INTERN:
		free_mapvalues(this->content.children.l);
		free_mapvalues(this->content.children.r);
		break;
	}
}

void free_mapkeys(SortedMap *this) {
	switch (this->type) {
	case EMPTY:
		break;
	case LEAF:
		free(this->key);
		break;
	case INTERN:
		free_mapkeys(this->content.children.l);
		free_mapkeys(this->content.children.r);
		break;
	}
}

void * free_mappair(void *acc, char *key, void *value) {
	free(key);
	free(value);
	return NULL;
}

void * free_mapitem(void *acc, char *key, void *value) {
	free(value);
	return NULL;
}

void free_map(SortedMap *this) {
	switch (this->type) {
	case EMPTY:
	case LEAF:
		free(this);
		break;
	case INTERN:
		free_map(this->content.children.l);
		free_map(this->content.children.r);
		free(this);
		break;
	}
}