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// This is an open source non-commercial project. Dear PVS-Studio, please check
// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
#include <assert.h>
#include "nvim/ascii.h"
#include "nvim/edit.h"
#include "nvim/ex_docmd.h"
#include "nvim/getchar.h"
#include "nvim/lib/kvec.h"
#include "nvim/log.h"
#include "nvim/main.h"
#include "nvim/option_defs.h"
#include "nvim/os/input.h"
#include "nvim/state.h"
#include "nvim/ui.h"
#include "nvim/vim.h"
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "state.c.generated.h"
#endif
void state_enter(VimState *s)
{
for (;;) {
int check_result = s->check ? s->check(s) : 1;
if (!check_result) {
break; // Terminate this state.
} else if (check_result == -1) {
continue; // check() again.
}
// Execute this state.
int key;
getkey:
if (char_avail() || using_script() || input_available()) {
// Don't block for events if there's a character already available for
// processing. Characters can come from mappings, scripts and other
// sources, so this scenario is very common.
key = safe_vgetc();
} else if (!multiqueue_empty(main_loop.events)) {
// Event was made available after the last multiqueue_process_events call
key = K_EVENT;
} else {
// Flush screen updates before blocking
ui_flush();
// Call `os_inchar` directly to block for events or user input without
// consuming anything from `input_buffer`(os/input.c) or calling the
// mapping engine.
(void)os_inchar(NULL, 0, -1, 0, main_loop.events);
// If an event was put into the queue, we send K_EVENT directly.
key = !multiqueue_empty(main_loop.events)
? K_EVENT
: safe_vgetc();
}
if (key == K_EVENT) {
may_sync_undo();
}
#if MIN_LOG_LEVEL <= DEBUG_LOG_LEVEL
log_key(DEBUG_LOG_LEVEL, key);
#endif
int execute_result = s->execute(s, key);
if (!execute_result) {
break;
} else if (execute_result == -1) {
goto getkey;
}
}
}
/// process events on main_loop, but interrupt if input is available
///
/// This should be used to handle K_EVENT in states accepting input
/// otherwise bursts of events can block break checking indefinitely.
void state_handle_k_event(void)
{
while (true) {
Event event = multiqueue_get(main_loop.events);
if (event.handler) {
event.handler(event.argv);
}
if (multiqueue_empty(main_loop.events)) {
// don't breakcheck before return, caller should return to main-loop
// and handle input already.
return;
}
// TODO(bfredl): as an further micro-optimization, we could check whether
// event.handler already checked input.
os_breakcheck();
if (input_available() || got_int) {
return;
}
}
}
/// Return true if in the current mode we need to use virtual.
bool virtual_active(void)
{
// While an operator is being executed we return "virtual_op", because
// VIsual_active has already been reset, thus we can't check for "block"
// being used.
if (virtual_op != kNone) {
return virtual_op;
}
return ve_flags == VE_ALL
|| ((ve_flags & VE_BLOCK) && VIsual_active && VIsual_mode == Ctrl_V)
|| ((ve_flags & VE_INSERT) && (State & INSERT));
}
/// VISUAL, SELECTMODE and OP_PENDING State are never set, they are equal to
/// NORMAL State with a condition. This function returns the real State.
int get_real_state(void)
{
if (State & NORMAL) {
if (VIsual_active) {
if (VIsual_select) {
return SELECTMODE;
}
return VISUAL;
} else if (finish_op) {
return OP_PENDING;
}
}
return State;
}
/// @returns[allocated] mode string
char *get_mode(void)
{
char *buf = xcalloc(4, sizeof(char));
if (VIsual_active) {
if (VIsual_select) {
buf[0] = (char)(VIsual_mode + 's' - 'v');
} else {
buf[0] = (char)VIsual_mode;
if (restart_VIsual_select) {
buf[1] = 's';
}
}
} else if (State == HITRETURN || State == ASKMORE || State == SETWSIZE
|| State == CONFIRM) {
buf[0] = 'r';
if (State == ASKMORE) {
buf[1] = 'm';
} else if (State == CONFIRM) {
buf[1] = '?';
}
} else if (State == EXTERNCMD) {
buf[0] = '!';
} else if (State & INSERT) {
if (State & VREPLACE_FLAG) {
buf[0] = 'R';
buf[1] = 'v';
if (ins_compl_active()) {
buf[2] = 'c';
} else if (ctrl_x_mode_not_defined_yet()) {
buf[2] = 'x';
}
} else {
if (State & REPLACE_FLAG) {
buf[0] = 'R';
} else {
buf[0] = 'i';
}
if (ins_compl_active()) {
buf[1] = 'c';
} else if (ctrl_x_mode_not_defined_yet()) {
buf[1] = 'x';
}
}
} else if (State & CMDLINE) {
buf[0] = 'c';
if (exmode_active) {
buf[1] = 'v';
}
} else if (State & TERM_FOCUS) {
buf[0] = 't';
} else {
buf[0] = 'n';
if (finish_op) {
buf[1] = 'o';
// to be able to detect force-linewise/blockwise/charwise operations
buf[2] = (char)motion_force;
} else if (restart_edit == 'I' || restart_edit == 'R'
|| restart_edit == 'V') {
buf[1] = 'i';
buf[2] = (char)restart_edit;
} else if (curbuf->terminal) {
buf[1] = 't';
}
}
return buf;
}
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