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/*
* Copyright (C) 2012-2025 Robin Haberkorn
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <glib.h>
#include <glib/gprintf.h>
#include "sciteco.h"
#include "string-utils.h"
#include "undo.h"
#include "rb3str.h"
#include "goto.h"
//#define DEBUG
/** @extends teco_rb3str_head_t */
typedef struct {
teco_rb3str_head_t head;
gsize pc;
} teco_goto_label_t;
/** @private @static @memberof teco_goto_label_t */
static teco_goto_label_t *
teco_goto_label_new(const gchar *name, gsize len, gsize pc)
{
teco_goto_label_t *label = g_new0(teco_goto_label_t, 1);
teco_string_init(&label->head.name, name, len);
label->pc = pc;
return label;
}
/** @private @memberof teco_goto_label_t */
static inline void
teco_goto_label_free(teco_goto_label_t *label)
{
teco_string_clear(&label->head.name);
g_free(label);
}
/*
* FIXME: Most of these methods could be static since
* they are only called from goto.c.
*/
#ifdef DEBUG
static void
teco_goto_table_dump(teco_goto_table_t *ctx)
{
for (rb3_head *cur = rb3_get_min(&ctx->tree);
cur != NULL;
cur = rb3_get_next(cur)) {
teco_goto_label_t *label = (teco_goto_label_t *)cur;
g_autofree *label_printable;
label_printable = teco_string_echo(cur->head.key.data, cur->head.key.len);
g_printf("table[\"%s\"] = %d\n", label_printable, label->pc);
}
g_printf("---END---\n");
}
#endif
/**
* Remove label from goto table.
*
* @param ctx Goto table
* @param name Label name
* @param len Length of label name
* @return TRUE if the label existed and was removed
*
* @memberof teco_goto_table_t
*/
gboolean
teco_goto_table_remove(teco_goto_table_t *ctx, const gchar *name, gsize len)
{
teco_goto_label_t *label = (teco_goto_label_t *)teco_rb3str_find(&ctx->tree, TRUE, name, len);
if (!label)
return FALSE;
rb3_unlink_and_rebalance(&label->head.head);
teco_goto_label_free(label);
return TRUE;
}
/*
* NOTE: We don't simply TECO_DEFINE_UNDO_CALL(), so we can store `name`
* as part of the undo token.
* If it would be a temporary pointer, TECO_DEFINE_UNDO_CALL() wouldn't
* do anyway.
*/
typedef struct {
teco_goto_table_t *table;
gsize len;
gchar name[];
} teco_goto_table_undo_remove_t;
static void
teco_goto_table_undo_remove_action(teco_goto_table_undo_remove_t *ctx, gboolean run)
{
if (!run)
return;
G_GNUC_UNUSED gboolean removed = teco_goto_table_remove(ctx->table, ctx->name, ctx->len);
g_assert(removed == TRUE);
#ifdef DEBUG
teco_goto_table_dump(ctx->table);
#endif
}
/** @memberof teco_goto_table_t */
void
teco_goto_table_undo_remove(teco_goto_table_t *ctx, const gchar *name, gsize len)
{
if (!ctx->must_undo)
return;
teco_goto_table_undo_remove_t *token;
token = teco_undo_push_size((teco_undo_action_t)teco_goto_table_undo_remove_action,
sizeof(*token) + len);
if (token) {
token->table = ctx;
token->len = len;
if (name)
memcpy(token->name, name, len);
}
}
/** @memberof teco_goto_table_t */
gssize
teco_goto_table_find(teco_goto_table_t *ctx, const gchar *name, gsize len)
{
teco_goto_label_t *label = (teco_goto_label_t *)teco_rb3str_find(&ctx->tree, TRUE, name, len);
return label ? label->pc : -1;
}
/**
* Insert label into goto table.
*
* @param ctx Goto table
* @param name Label name
* @param len Length of label name
* @param pc Program counter of the new label
* @return The program counter of any label of the same name
* or -1. The label is inserted only if there is no label in the
* table already.
*
* @memberof teco_goto_table_t
*/
gssize
teco_goto_table_set(teco_goto_table_t *ctx, const gchar *name, gsize len, gsize pc)
{
gssize existing_pc = teco_goto_table_find(ctx, name, len);
if (existing_pc >= 0)
return existing_pc;
teco_goto_label_t *label = teco_goto_label_new(name, len, pc);
teco_rb3str_insert(&ctx->tree, TRUE, &label->head);
#ifdef DEBUG
teco_goto_table_dump(ctx);
#endif
return -1;
}
/** @memberof teco_goto_table_t */
void
teco_goto_table_clear(teco_goto_table_t *ctx)
{
struct rb3_head *cur;
while ((cur = rb3_get_root(&ctx->tree))) {
rb3_unlink_and_rebalance(cur);
teco_goto_label_free((teco_goto_label_t *)cur);
}
}
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