new file mode 100644
--- /dev/null
+++ b/src/dict.c
@@ -0,0 +1,820 @@
+/* vi:set ts=8 sts=4 sw=4:
+ *
+ * VIM - Vi IMproved	by Bram Moolenaar
+ *
+ * Do ":help uganda"  in Vim to read copying and usage conditions.
+ * Do ":help credits" in Vim to see a list of people who contributed.
+ * See README.txt for an overview of the Vim source code.
+ */
+
+/*
+ * dict.c: Dictionary support
+ */
+#define USING_FLOAT_STUFF
+
+#include "vim.h"
+
+#if defined(FEAT_EVAL) || defined(PROTO)
+
+/* List head for garbage collection. Although there can be a reference loop
+ * from partial to dict to partial, we don't need to keep track of the partial,
+ * since it will get freed when the dict is unused and gets freed. */
+static dict_T		*first_dict = NULL;	/* list of all dicts */
+
+/*
+ * Allocate an empty header for a dictionary.
+ */
+    dict_T *
+dict_alloc(void)
+{
+    dict_T *d;
+
+    d = (dict_T *)alloc(sizeof(dict_T));
+    if (d != NULL)
+    {
+	/* Add the dict to the list of dicts for garbage collection. */
+	if (first_dict != NULL)
+	    first_dict->dv_used_prev = d;
+	d->dv_used_next = first_dict;
+	d->dv_used_prev = NULL;
+	first_dict = d;
+
+	hash_init(&d->dv_hashtab);
+	d->dv_lock = 0;
+	d->dv_scope = 0;
+	d->dv_refcount = 0;
+	d->dv_copyID = 0;
+    }
+    return d;
+}
+
+/*
+ * Allocate an empty dict for a return value.
+ * Returns OK or FAIL.
+ */
+    int
+rettv_dict_alloc(typval_T *rettv)
+{
+    dict_T	*d = dict_alloc();
+
+    if (d == NULL)
+	return FAIL;
+
+    rettv->vval.v_dict = d;
+    rettv->v_type = VAR_DICT;
+    rettv->v_lock = 0;
+    ++d->dv_refcount;
+    return OK;
+}
+
+/*
+ * Free a Dictionary, including all non-container items it contains.
+ * Ignores the reference count.
+ */
+    static void
+dict_free_contents(dict_T *d)
+{
+    int		todo;
+    hashitem_T	*hi;
+    dictitem_T	*di;
+
+    /* Lock the hashtab, we don't want it to resize while freeing items. */
+    hash_lock(&d->dv_hashtab);
+    todo = (int)d->dv_hashtab.ht_used;
+    for (hi = d->dv_hashtab.ht_array; todo > 0; ++hi)
+    {
+	if (!HASHITEM_EMPTY(hi))
+	{
+	    /* Remove the item before deleting it, just in case there is
+	     * something recursive causing trouble. */
+	    di = HI2DI(hi);
+	    hash_remove(&d->dv_hashtab, hi);
+	    clear_tv(&di->di_tv);
+	    vim_free(di);
+	    --todo;
+	}
+    }
+    hash_clear(&d->dv_hashtab);
+}
+
+    static void
+dict_free_dict(dict_T *d)
+{
+    /* Remove the dict from the list of dicts for garbage collection. */
+    if (d->dv_used_prev == NULL)
+	first_dict = d->dv_used_next;
+    else
+	d->dv_used_prev->dv_used_next = d->dv_used_next;
+    if (d->dv_used_next != NULL)
+	d->dv_used_next->dv_used_prev = d->dv_used_prev;
+    vim_free(d);
+}
+
+    static void
+dict_free(dict_T *d)
+{
+    if (!in_free_unref_items)
+    {
+	dict_free_contents(d);
+	dict_free_dict(d);
+    }
+}
+
+/*
+ * Unreference a Dictionary: decrement the reference count and free it when it
+ * becomes zero.
+ */
+    void
+dict_unref(dict_T *d)
+{
+    if (d != NULL && --d->dv_refcount <= 0)
+	dict_free(d);
+}
+
+/*
+ * Go through the list of dicts and free items without the copyID.
+ * Returns TRUE if something was freed.
+ */
+    int
+dict_free_nonref(int copyID)
+{
+    dict_T	*dd;
+    int		did_free = FALSE;
+
+    for (dd = first_dict; dd != NULL; dd = dd->dv_used_next)
+	if ((dd->dv_copyID & COPYID_MASK) != (copyID & COPYID_MASK))
+	{
+	    /* Free the Dictionary and ordinary items it contains, but don't
+	     * recurse into Lists and Dictionaries, they will be in the list
+	     * of dicts or list of lists. */
+	    dict_free_contents(dd);
+	    did_free = TRUE;
+	}
+    return did_free;
+}
+
+    void
+dict_free_items(int copyID)
+{
+    dict_T	*dd, *dd_next;
+
+    for (dd = first_dict; dd != NULL; dd = dd_next)
+    {
+	dd_next = dd->dv_used_next;
+	if ((dd->dv_copyID & COPYID_MASK) != (copyID & COPYID_MASK))
+	    dict_free_dict(dd);
+    }
+}
+
+/*
+ * Allocate a Dictionary item.
+ * The "key" is copied to the new item.
+ * Note that the value of the item "di_tv" still needs to be initialized!
+ * Returns NULL when out of memory.
+ */
+    dictitem_T *
+dictitem_alloc(char_u *key)
+{
+    dictitem_T *di;
+
+    di = (dictitem_T *)alloc((unsigned)(sizeof(dictitem_T) + STRLEN(key)));
+    if (di != NULL)
+    {
+	STRCPY(di->di_key, key);
+	di->di_flags = DI_FLAGS_ALLOC;
+    }
+    return di;
+}
+
+/*
+ * Make a copy of a Dictionary item.
+ */
+    static dictitem_T *
+dictitem_copy(dictitem_T *org)
+{
+    dictitem_T *di;
+
+    di = (dictitem_T *)alloc((unsigned)(sizeof(dictitem_T)
+						      + STRLEN(org->di_key)));
+    if (di != NULL)
+    {
+	STRCPY(di->di_key, org->di_key);
+	di->di_flags = DI_FLAGS_ALLOC;
+	copy_tv(&org->di_tv, &di->di_tv);
+    }
+    return di;
+}
+
+/*
+ * Remove item "item" from Dictionary "dict" and free it.
+ */
+    void
+dictitem_remove(dict_T *dict, dictitem_T *item)
+{
+    hashitem_T	*hi;
+
+    hi = hash_find(&dict->dv_hashtab, item->di_key);
+    if (HASHITEM_EMPTY(hi))
+	EMSG2(_(e_intern2), "dictitem_remove()");
+    else
+	hash_remove(&dict->dv_hashtab, hi);
+    dictitem_free(item);
+}
+
+/*
+ * Free a dict item.  Also clears the value.
+ */
+    void
+dictitem_free(dictitem_T *item)
+{
+    clear_tv(&item->di_tv);
+    if (item->di_flags & DI_FLAGS_ALLOC)
+	vim_free(item);
+}
+
+/*
+ * Make a copy of dict "d".  Shallow if "deep" is FALSE.
+ * The refcount of the new dict is set to 1.
+ * See item_copy() for "copyID".
+ * Returns NULL when out of memory.
+ */
+    dict_T *
+dict_copy(dict_T *orig, int deep, int copyID)
+{
+    dict_T	*copy;
+    dictitem_T	*di;
+    int		todo;
+    hashitem_T	*hi;
+
+    if (orig == NULL)
+	return NULL;
+
+    copy = dict_alloc();
+    if (copy != NULL)
+    {
+	if (copyID != 0)
+	{
+	    orig->dv_copyID = copyID;
+	    orig->dv_copydict = copy;
+	}
+	todo = (int)orig->dv_hashtab.ht_used;
+	for (hi = orig->dv_hashtab.ht_array; todo > 0 && !got_int; ++hi)
+	{
+	    if (!HASHITEM_EMPTY(hi))
+	    {
+		--todo;
+
+		di = dictitem_alloc(hi->hi_key);
+		if (di == NULL)
+		    break;
+		if (deep)
+		{
+		    if (item_copy(&HI2DI(hi)->di_tv, &di->di_tv, deep,
+							      copyID) == FAIL)
+		    {
+			vim_free(di);
+			break;
+		    }
+		}
+		else
+		    copy_tv(&HI2DI(hi)->di_tv, &di->di_tv);
+		if (dict_add(copy, di) == FAIL)
+		{
+		    dictitem_free(di);
+		    break;
+		}
+	    }
+	}
+
+	++copy->dv_refcount;
+	if (todo > 0)
+	{
+	    dict_unref(copy);
+	    copy = NULL;
+	}
+    }
+
+    return copy;
+}
+
+/*
+ * Add item "item" to Dictionary "d".
+ * Returns FAIL when out of memory and when key already exists.
+ */
+    int
+dict_add(dict_T *d, dictitem_T *item)
+{
+    return hash_add(&d->dv_hashtab, item->di_key);
+}
+
+/*
+ * Add a number or string entry to dictionary "d".
+ * When "str" is NULL use number "nr", otherwise use "str".
+ * Returns FAIL when out of memory and when key already exists.
+ */
+    int
+dict_add_nr_str(
+    dict_T	*d,
+    char	*key,
+    varnumber_T	nr,
+    char_u	*str)
+{
+    dictitem_T	*item;
+
+    item = dictitem_alloc((char_u *)key);
+    if (item == NULL)
+	return FAIL;
+    item->di_tv.v_lock = 0;
+    if (str == NULL)
+    {
+	item->di_tv.v_type = VAR_NUMBER;
+	item->di_tv.vval.v_number = nr;
+    }
+    else
+    {
+	item->di_tv.v_type = VAR_STRING;
+	item->di_tv.vval.v_string = vim_strsave(str);
+    }
+    if (dict_add(d, item) == FAIL)
+    {
+	dictitem_free(item);
+	return FAIL;
+    }
+    return OK;
+}
+
+/*
+ * Add a list entry to dictionary "d".
+ * Returns FAIL when out of memory and when key already exists.
+ */
+    int
+dict_add_list(dict_T *d, char *key, list_T *list)
+{
+    dictitem_T	*item;
+
+    item = dictitem_alloc((char_u *)key);
+    if (item == NULL)
+	return FAIL;
+    item->di_tv.v_lock = 0;
+    item->di_tv.v_type = VAR_LIST;
+    item->di_tv.vval.v_list = list;
+    if (dict_add(d, item) == FAIL)
+    {
+	dictitem_free(item);
+	return FAIL;
+    }
+    ++list->lv_refcount;
+    return OK;
+}
+
+/*
+ * Get the number of items in a Dictionary.
+ */
+    long
+dict_len(dict_T *d)
+{
+    if (d == NULL)
+	return 0L;
+    return (long)d->dv_hashtab.ht_used;
+}
+
+/*
+ * Find item "key[len]" in Dictionary "d".
+ * If "len" is negative use strlen(key).
+ * Returns NULL when not found.
+ */
+    dictitem_T *
+dict_find(dict_T *d, char_u *key, int len)
+{
+#define AKEYLEN 200
+    char_u	buf[AKEYLEN];
+    char_u	*akey;
+    char_u	*tofree = NULL;
+    hashitem_T	*hi;
+
+    if (d == NULL)
+	return NULL;
+    if (len < 0)
+	akey = key;
+    else if (len >= AKEYLEN)
+    {
+	tofree = akey = vim_strnsave(key, len);
+	if (akey == NULL)
+	    return NULL;
+    }
+    else
+    {
+	/* Avoid a malloc/free by using buf[]. */
+	vim_strncpy(buf, key, len);
+	akey = buf;
+    }
+
+    hi = hash_find(&d->dv_hashtab, akey);
+    vim_free(tofree);
+    if (HASHITEM_EMPTY(hi))
+	return NULL;
+    return HI2DI(hi);
+}
+
+/*
+ * Get a string item from a dictionary.
+ * When "save" is TRUE allocate memory for it.
+ * Returns NULL if the entry doesn't exist or out of memory.
+ */
+    char_u *
+get_dict_string(dict_T *d, char_u *key, int save)
+{
+    dictitem_T	*di;
+    char_u	*s;
+
+    di = dict_find(d, key, -1);
+    if (di == NULL)
+	return NULL;
+    s = get_tv_string(&di->di_tv);
+    if (save && s != NULL)
+	s = vim_strsave(s);
+    return s;
+}
+
+/*
+ * Get a number item from a dictionary.
+ * Returns 0 if the entry doesn't exist.
+ */
+    varnumber_T
+get_dict_number(dict_T *d, char_u *key)
+{
+    dictitem_T	*di;
+
+    di = dict_find(d, key, -1);
+    if (di == NULL)
+	return 0;
+    return get_tv_number(&di->di_tv);
+}
+
+/*
+ * Return an allocated string with the string representation of a Dictionary.
+ * May return NULL.
+ */
+    char_u *
+dict2string(typval_T *tv, int copyID, int restore_copyID)
+{
+    garray_T	ga;
+    int		first = TRUE;
+    char_u	*tofree;
+    char_u	numbuf[NUMBUFLEN];
+    hashitem_T	*hi;
+    char_u	*s;
+    dict_T	*d;
+    int		todo;
+
+    if ((d = tv->vval.v_dict) == NULL)
+	return NULL;
+    ga_init2(&ga, (int)sizeof(char), 80);
+    ga_append(&ga, '{');
+
+    todo = (int)d->dv_hashtab.ht_used;
+    for (hi = d->dv_hashtab.ht_array; todo > 0 && !got_int; ++hi)
+    {
+	if (!HASHITEM_EMPTY(hi))
+	{
+	    --todo;
+
+	    if (first)
+		first = FALSE;
+	    else
+		ga_concat(&ga, (char_u *)", ");
+
+	    tofree = string_quote(hi->hi_key, FALSE);
+	    if (tofree != NULL)
+	    {
+		ga_concat(&ga, tofree);
+		vim_free(tofree);
+	    }
+	    ga_concat(&ga, (char_u *)": ");
+	    s = echo_string_core(&HI2DI(hi)->di_tv, &tofree, numbuf, copyID,
+						 FALSE, restore_copyID, TRUE);
+	    if (s != NULL)
+		ga_concat(&ga, s);
+	    vim_free(tofree);
+	    if (s == NULL || did_echo_string_emsg)
+		break;
+	    line_breakcheck();
+
+	}
+    }
+    if (todo > 0)
+    {
+	vim_free(ga.ga_data);
+	return NULL;
+    }
+
+    ga_append(&ga, '}');
+    ga_append(&ga, NUL);
+    return (char_u *)ga.ga_data;
+}
+
+/*
+ * Allocate a variable for a Dictionary and fill it from "*arg".
+ * Return OK or FAIL.  Returns NOTDONE for {expr}.
+ */
+    int
+get_dict_tv(char_u **arg, typval_T *rettv, int evaluate)
+{
+    dict_T	*d = NULL;
+    typval_T	tvkey;
+    typval_T	tv;
+    char_u	*key = NULL;
+    dictitem_T	*item;
+    char_u	*start = skipwhite(*arg + 1);
+    char_u	buf[NUMBUFLEN];
+
+    /*
+     * First check if it's not a curly-braces thing: {expr}.
+     * Must do this without evaluating, otherwise a function may be called
+     * twice.  Unfortunately this means we need to call eval1() twice for the
+     * first item.
+     * But {} is an empty Dictionary.
+     */
+    if (*start != '}')
+    {
+	if (eval1(&start, &tv, FALSE) == FAIL)	/* recursive! */
+	    return FAIL;
+	if (*start == '}')
+	    return NOTDONE;
+    }
+
+    if (evaluate)
+    {
+	d = dict_alloc();
+	if (d == NULL)
+	    return FAIL;
+    }
+    tvkey.v_type = VAR_UNKNOWN;
+    tv.v_type = VAR_UNKNOWN;
+
+    *arg = skipwhite(*arg + 1);
+    while (**arg != '}' && **arg != NUL)
+    {
+	if (eval1(arg, &tvkey, evaluate) == FAIL)	/* recursive! */
+	    goto failret;
+	if (**arg != ':')
+	{
+	    EMSG2(_("E720: Missing colon in Dictionary: %s"), *arg);
+	    clear_tv(&tvkey);
+	    goto failret;
+	}
+	if (evaluate)
+	{
+	    key = get_tv_string_buf_chk(&tvkey, buf);
+	    if (key == NULL)
+	    {
+		/* "key" is NULL when get_tv_string_buf_chk() gave an errmsg */
+		clear_tv(&tvkey);
+		goto failret;
+	    }
+	}
+
+	*arg = skipwhite(*arg + 1);
+	if (eval1(arg, &tv, evaluate) == FAIL)	/* recursive! */
+	{
+	    if (evaluate)
+		clear_tv(&tvkey);
+	    goto failret;
+	}
+	if (evaluate)
+	{
+	    item = dict_find(d, key, -1);
+	    if (item != NULL)
+	    {
+		EMSG2(_("E721: Duplicate key in Dictionary: \"%s\""), key);
+		clear_tv(&tvkey);
+		clear_tv(&tv);
+		goto failret;
+	    }
+	    item = dictitem_alloc(key);
+	    clear_tv(&tvkey);
+	    if (item != NULL)
+	    {
+		item->di_tv = tv;
+		item->di_tv.v_lock = 0;
+		if (dict_add(d, item) == FAIL)
+		    dictitem_free(item);
+	    }
+	}
+
+	if (**arg == '}')
+	    break;
+	if (**arg != ',')
+	{
+	    EMSG2(_("E722: Missing comma in Dictionary: %s"), *arg);
+	    goto failret;
+	}
+	*arg = skipwhite(*arg + 1);
+    }
+
+    if (**arg != '}')
+    {
+	EMSG2(_("E723: Missing end of Dictionary '}': %s"), *arg);
+failret:
+	if (evaluate)
+	    dict_free(d);
+	return FAIL;
+    }
+
+    *arg = skipwhite(*arg + 1);
+    if (evaluate)
+    {
+	rettv->v_type = VAR_DICT;
+	rettv->vval.v_dict = d;
+	++d->dv_refcount;
+    }
+
+    return OK;
+}
+
+/*
+ * Go over all entries in "d2" and add them to "d1".
+ * When "action" is "error" then a duplicate key is an error.
+ * When "action" is "force" then a duplicate key is overwritten.
+ * Otherwise duplicate keys are ignored ("action" is "keep").
+ */
+    void
+dict_extend(dict_T *d1, dict_T *d2, char_u *action)
+{
+    dictitem_T	*di1;
+    hashitem_T	*hi2;
+    int		todo;
+    char_u	*arg_errmsg = (char_u *)N_("extend() argument");
+
+    todo = (int)d2->dv_hashtab.ht_used;
+    for (hi2 = d2->dv_hashtab.ht_array; todo > 0; ++hi2)
+    {
+	if (!HASHITEM_EMPTY(hi2))
+	{
+	    --todo;
+	    di1 = dict_find(d1, hi2->hi_key, -1);
+	    if (d1->dv_scope != 0)
+	    {
+		/* Disallow replacing a builtin function in l: and g:.
+		 * Check the key to be valid when adding to any scope. */
+		if (d1->dv_scope == VAR_DEF_SCOPE
+			&& HI2DI(hi2)->di_tv.v_type == VAR_FUNC
+			&& var_check_func_name(hi2->hi_key, di1 == NULL))
+		    break;
+		if (!valid_varname(hi2->hi_key))
+		    break;
+	    }
+	    if (di1 == NULL)
+	    {
+		di1 = dictitem_copy(HI2DI(hi2));
+		if (di1 != NULL && dict_add(d1, di1) == FAIL)
+		    dictitem_free(di1);
+	    }
+	    else if (*action == 'e')
+	    {
+		EMSG2(_("E737: Key already exists: %s"), hi2->hi_key);
+		break;
+	    }
+	    else if (*action == 'f' && HI2DI(hi2) != di1)
+	    {
+		if (tv_check_lock(di1->di_tv.v_lock, arg_errmsg, TRUE)
+		      || var_check_ro(di1->di_flags, arg_errmsg, TRUE))
+		    break;
+		clear_tv(&di1->di_tv);
+		copy_tv(&HI2DI(hi2)->di_tv, &di1->di_tv);
+	    }
+	}
+    }
+}
+
+/*
+ * Return the dictitem that an entry in a hashtable points to.
+ */
+    dictitem_T *
+dict_lookup(hashitem_T *hi)
+{
+    return HI2DI(hi);
+}
+
+/*
+ * Return TRUE when two dictionaries have exactly the same key/values.
+ */
+    int
+dict_equal(
+    dict_T	*d1,
+    dict_T	*d2,
+    int		ic,	/* ignore case for strings */
+    int		recursive) /* TRUE when used recursively */
+{
+    hashitem_T	*hi;
+    dictitem_T	*item2;
+    int		todo;
+
+    if (d1 == NULL && d2 == NULL)
+	return TRUE;
+    if (d1 == NULL || d2 == NULL)
+	return FALSE;
+    if (d1 == d2)
+	return TRUE;
+    if (dict_len(d1) != dict_len(d2))
+	return FALSE;
+
+    todo = (int)d1->dv_hashtab.ht_used;
+    for (hi = d1->dv_hashtab.ht_array; todo > 0; ++hi)
+    {
+	if (!HASHITEM_EMPTY(hi))
+	{
+	    item2 = dict_find(d2, hi->hi_key, -1);
+	    if (item2 == NULL)
+		return FALSE;
+	    if (!tv_equal(&HI2DI(hi)->di_tv, &item2->di_tv, ic, recursive))
+		return FALSE;
+	    --todo;
+	}
+    }
+    return TRUE;
+}
+
+/*
+ * Turn a dict into a list:
+ * "what" == 0: list of keys
+ * "what" == 1: list of values
+ * "what" == 2: list of items
+ */
+    void
+dict_list(typval_T *argvars, typval_T *rettv, int what)
+{
+    list_T	*l2;
+    dictitem_T	*di;
+    hashitem_T	*hi;
+    listitem_T	*li;
+    listitem_T	*li2;
+    dict_T	*d;
+    int		todo;
+
+    if (argvars[0].v_type != VAR_DICT)
+    {
+	EMSG(_(e_dictreq));
+	return;
+    }
+    if ((d = argvars[0].vval.v_dict) == NULL)
+	return;
+
+    if (rettv_list_alloc(rettv) == FAIL)
+	return;
+
+    todo = (int)d->dv_hashtab.ht_used;
+    for (hi = d->dv_hashtab.ht_array; todo > 0; ++hi)
+    {
+	if (!HASHITEM_EMPTY(hi))
+	{
+	    --todo;
+	    di = HI2DI(hi);
+
+	    li = listitem_alloc();
+	    if (li == NULL)
+		break;
+	    list_append(rettv->vval.v_list, li);
+
+	    if (what == 0)
+	    {
+		/* keys() */
+		li->li_tv.v_type = VAR_STRING;
+		li->li_tv.v_lock = 0;
+		li->li_tv.vval.v_string = vim_strsave(di->di_key);
+	    }
+	    else if (what == 1)
+	    {
+		/* values() */
+		copy_tv(&di->di_tv, &li->li_tv);
+	    }
+	    else
+	    {
+		/* items() */
+		l2 = list_alloc();
+		li->li_tv.v_type = VAR_LIST;
+		li->li_tv.v_lock = 0;
+		li->li_tv.vval.v_list = l2;
+		if (l2 == NULL)
+		    break;
+		++l2->lv_refcount;
+
+		li2 = listitem_alloc();
+		if (li2 == NULL)
+		    break;
+		list_append(l2, li2);
+		li2->li_tv.v_type = VAR_STRING;
+		li2->li_tv.v_lock = 0;
+		li2->li_tv.vval.v_string = vim_strsave(di->di_key);
+
+		li2 = listitem_alloc();
+		if (li2 == NULL)
+		    break;
+		list_append(l2, li2);
+		copy_tv(&di->di_tv, &li2->li_tv);
+	    }
+	}
+    }
+}
+
+#endif /* defined(FEAT_EVAL) */