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/*
* Copyright (C) 2012-2022 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 "sciteco.h"
#include "string-utils.h"
#include "expressions.h"
#include "parser.h"
#include "core-commands.h"
#include "undo.h"
#include "goto.h"
#include "goto-commands.h"
teco_string_t teco_goto_skip_label = {NULL, 0};
static gboolean
teco_state_label_initial(teco_machine_main_t *ctx, GError **error)
{
memset(&ctx->goto_label, 0, sizeof(ctx->goto_label));
return TRUE;
}
/*
* NOTE: The comma is theoretically not allowed in a label
* (see <O> syntax), but is accepted anyway since labels
* are historically used as comments.
*
* TODO: Add support for "true" comments of the form !* ... *!
* This would be almost trivial to implement, but if we don't
* want any (even temporary) overhead for comments at all, we need
* to add a new parser state.
* I'm unsure whether !-signs should be allowed within comments.
*/
static teco_state_t *
teco_state_label_input(teco_machine_main_t *ctx, gchar chr, GError **error)
{
if (chr == '!') {
/*
* NOTE: If the label already existed, its PC will be restored
* on rubout.
* Otherwise, the label will be removed (PC == -1).
*/
gint existing_pc = teco_goto_table_set(&ctx->goto_table, ctx->goto_label.data,
ctx->goto_label.len, ctx->macro_pc);
if (ctx->parent.must_undo)
teco_goto_table_undo_set(&ctx->goto_table, ctx->goto_label.data, ctx->goto_label.len, existing_pc);
if (teco_goto_skip_label.len > 0 &&
!teco_string_cmp(&ctx->goto_label, teco_goto_skip_label.data, teco_goto_skip_label.len)) {
teco_undo_string_own(teco_goto_skip_label);
memset(&teco_goto_skip_label, 0, sizeof(teco_goto_skip_label));
if (ctx->parent.must_undo)
teco_undo_guint(ctx->__flags);
ctx->mode = TECO_MODE_NORMAL;
}
if (ctx->parent.must_undo)
teco_undo_string_own(ctx->goto_label);
else
teco_string_clear(&ctx->goto_label);
return &teco_state_start;
}
if (ctx->parent.must_undo)
undo__teco_string_truncate(&ctx->goto_label, ctx->goto_label.len);
teco_string_append_c(&ctx->goto_label, chr);
return &teco_state_label;
}
TECO_DEFINE_STATE(teco_state_label,
.initial_cb = (teco_state_initial_cb_t)teco_state_label_initial
);
static teco_state_t *
teco_state_goto_done(teco_machine_main_t *ctx, const teco_string_t *str, GError **error)
{
if (ctx->mode > TECO_MODE_NORMAL)
return &teco_state_start;
teco_int_t value;
if (!teco_expressions_pop_num_calc(&value, 1, error))
return NULL;
/*
* Find the comma-separated substring in str indexed by `value`.
*/
teco_string_t label = {NULL, 0};
while (value > 0) {
label.data = label.data ? label.data+label.len+1 : str->data;
const gchar *p = label.data ? memchr(label.data, ',', str->len - (label.data - str->data)) : NULL;
label.len = p ? p - label.data : str->len - (label.data - str->data);
value--;
if (!p)
break;
}
if (value == 0) {
gint pc = teco_goto_table_find(&ctx->goto_table, label.data, label.len);
if (pc >= 0) {
ctx->macro_pc = pc;
} else {
/* skip till label is defined */
g_assert(teco_goto_skip_label.len == 0);
undo__teco_string_truncate(&teco_goto_skip_label, 0);
teco_string_init(&teco_goto_skip_label, label.data, label.len);
if (ctx->parent.must_undo)
teco_undo_guint(ctx->__flags);
ctx->mode = TECO_MODE_PARSE_ONLY_GOTO;
}
}
return &teco_state_start;
}
/* in cmdline.c */
gboolean teco_state_goto_process_edit_cmd(teco_machine_main_t *ctx, teco_machine_t *parent_ctx, gchar chr, GError **error);
/*$ O
* Olabel$ -- Go to label
* [n]Olabel1[,label2,...]$
*
* Go to <label>.
* The simple go-to command is a special case of the
* computed go-to command.
* A comma-separated list of labels may be specified
* in the string argument.
* The label to jump to is selected by <n> (1 is <label1>,
* 2 is <label2>, etc.).
* If <n> is omitted, 1 is implied.
*
* If the label selected by <n> is does not exist in the
* list of labels, the command does nothing.
* Label definitions are cached in a table, so that
* if the label to go to has already been defined, the
* go-to command will jump immediately.
* Otherwise, parsing continues until the <label>
* is defined.
* The command will yield an error if a label has
* not been defined when the macro or command-line
* is terminated.
* In the latter case, the user will not be able to
* terminate the command-line.
*/
TECO_DEFINE_STATE_EXPECTSTRING(teco_state_goto,
.process_edit_cmd_cb = (teco_state_process_edit_cmd_cb_t)teco_state_goto_process_edit_cmd
);
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