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ljmp.c
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ljmp.c
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/* ljmp text editor
*
* appreciate to kilo text editor:
* https://viewsourcecode.org/snaptoken/kilo/
* https://github.com/antirez/kilo
*
* License: BSD 2-clause License
* (Begin of License)
*
* Copyright (c) 2016, Salvatore Sanfilippo <antirez at gmail dot com>
* (Extended by) Copyright (c) 2018, 2019 hiromi-mi
* <hiromi(hyphen)mi (at) cat (dot) zaq (dot) jp>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* (End of License)
*/
/*** includes ***/
#define _DEFAULT_SOURCE
#define _BSD_SOURCE
#define _GNU_SOURCE // to use getline(): GNU Extension
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <locale.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
#include <wchar.h>
/** defines ***/
#define LJMP_VERSION "0.0.2"
#define LJMP_TAB_STOP 8
#define LJMP_SOFT_TAB 3
#define LJMP_QUIT_TIMES 2
#define CTRL_KEY(k) ((k)&0x1f)
#define termsend(str, bytes) (write(STDOUT_FILENO, str, bytes))
#define termread(str, bytes) (read(STDIN_FILENO, str, bytes))
enum editorKey {
BACKSPACE = 127,
ARROW_LEFT = 1000,
ARROW_RIGHT,
ARROW_UP,
ARROW_DOWN,
DEL_KEY,
HOME_KEY,
END_KEY,
PAGE_UP,
PAGE_DOWN,
ARROW_LEFT_CTRL,
ARROW_RIGHT_CTRL,
ARROW_LEFT_SHIFT_CTRL,
ARROW_RIGHT_SHIFT_CTRL,
ARROW_UP_CTRL,
ARROW_DOWN_CTRL,
ARROW_LEFT_SHIFT,
ARROW_RIGHT_SHIFT,
ARROW_UP_SHIFT,
ARROW_DOWN_SHIFT
};
enum editorHighlight {
HL_NORMAL = 0,
HL_COMMENT,
HL_MLCOMMENT,
HL_KEYWORD1,
HL_KEYWORD2,
HL_STRING,
HL_NUMBER,
HL_MATCH
};
#define HL_HIGHLIGHT_NUMBERS (1 << 0)
#define HL_HIGHLIGHT_STRINGS (1 << 1)
/*** prototypes ***/
// ほんとうに「バッファ」 write() 溜め
typedef struct abuf {
char *b;
int len;
} abuf;
#define ABUF_INIT \
{ NULL, 0 }
enum undoType { UNDOTYPE_ROWEDIT, UNDOTYPE_NEWLINE, UNDOTYPE_DELLINE };
typedef struct undoAPI {
enum undoType undo_type;
int old_cx;
int new_cx;
int cy;
int old_cy;
int new_cy;
struct abuf *old_buf;
struct abuf *new_buf;
} undoAPI;
typedef struct undoStack {
undoAPI **api;
int length;
int max_length;
int cy;
} undoStack;
void die(const char *s);
/*** allocate ***/
void *safe_realloc(void *ptr, size_t cnt) {
if (cnt == 0) {
return ptr;
}
void *result = realloc(ptr, cnt);
if (result == NULL) {
puts("realloc");
exit(-1);
}
return result;
}
void *safe_malloc(size_t size) {
void *result = malloc(size);
if (result == NULL) {
puts("try to malloc null pointer.");
exit(-1);
}
return result;
}
void safe_free(void *ptr) {
if (ptr == NULL) {
puts("try to double-free.");
}
free(ptr);
ptr = NULL;
}
/*** data ***/
struct editorSyntax {
char *filetype; // ステータスバーの表示名
char **filematch; // ファイル拡張子などのマッチパターン
char **keywords;
int keywords_number;
char *singleline_comment_start;
char *multiline_comment_start;
char *multiline_comment_end;
int flags; // 何をハイライトさせるか. bit flag.
};
/* 行 */
typedef struct erow {
int idx; // ファイル内でのindex
int bsize; // バイナリ的な長さ
int rbsize; // 実際に描画するテキストの長さ
int rrsize; // 実際に描画するテキストの文字幅合計
int csize; // 文字数
char *chars; // 格納されたテキスト
char *render; // 実際に描画するテキスト
unsigned char *hl;
int hl_open_comment;
int indentations; // インデント行数
int softtabstop; // インデント幅: softtabstop != 0 なら動く
} erow;
struct editorConfig {
int cx, cy; // current position within the file
int rx; /* render の進み具合 */
int bx; /* バイナリ列としての文字位置 */
int rowoff; // row offset: スクロールの天井にある位置
int coloff; // col offset: スクロールの左端にある位置
int screenrows; // 端末(ry
int screencols;
int numrows; // 行数
int sb_bx, sb_by; // 選択開始のbx, by
int se_bx, se_by; // 選択終了のbx, by
erow *row; // 実際の内容
int dirty;
char *filename;
char statusmsg[160];
time_t statusmsg_time;
struct editorSyntax *syntax;
struct termios orig_termios;
struct abuf copybuf;
undoStack *undoStack; // undo置き場
undoStack *redoStack; // redo置き場
int flags;
};
#define FLAG_COMPLETING (1 << 0)
struct editorConfig E;
/*** filetypes ***/
char *C_HL_extensions[] = {".c", ".h", ".cpp", NULL};
char *C_HL_keywords[] = {"switch", "if", "while", "for", "break", "continue",
"return", "else", "struct", "union", "typedef",
"static", "enum", "class", "case", "#include",
"#ifdef", "#if", "#ifndef", "#else", "#elif", "#endif",
"#pragma", "#define",
// 型 (KEYWORD2)
"int|", "long|", "double|", "float|", "char|",
"unsigned|", "signed|", "void|", NULL};
char *PYTHON_HL_extensions[] = {".py", NULL};
char *PYTHON_HL_keywords[] = {
"class", "finally", "is", "return", "None", "continue",
"for", "lambda", "try", "True", "def", "from",
"nonlocal", "while", "and", "del", "global", "not",
"with", "as", "elif", "if", "or", "yield",
"assert", "else", "import", "pass", "break", "except",
"in", "raise", "False|", "None|", "True|", NULL};
char *MARKDOWN_HL_extensions[] = {".markdown", ".md", ".mkd", NULL};
char *MARKDOWN_HL_keywords[] = {NULL};
struct editorSyntax HLDB[] = {
{"c", C_HL_extensions, C_HL_keywords,
// ここで -1 が付くのは、最後のNULL を除くため
// やっぱやめ
sizeof(C_HL_keywords) / sizeof(C_HL_keywords[0]), "//", "/*", "*/",
HL_HIGHLIGHT_NUMBERS | HL_HIGHLIGHT_STRINGS},
// Python に複数行コメントはない. "" とすることで、無視できる.
{"python", PYTHON_HL_extensions, PYTHON_HL_keywords,
sizeof(PYTHON_HL_keywords) / sizeof(PYTHON_HL_keywords[0]), "#", "", "",
HL_HIGHLIGHT_NUMBERS | HL_HIGHLIGHT_STRINGS},
{"markdown", MARKDOWN_HL_extensions, MARKDOWN_HL_keywords,
sizeof(MARKDOWN_HL_keywords) / sizeof(MARKDOWN_HL_keywords[0]), "", "", "",
0}};
// エントリ数
#define HLDB_ENTRIES (sizeof(HLDB) / sizeof(HLDB[0]))
void editorSetStatusMessage(const char *fmt, ...);
void editorRefreshScreen();
void editorRowAssignString(erow *row, char *s, size_t len);
void editorRowInsertChar(erow *row, int at, char c);
void editorRowInsertString(erow *row, int at, const char *str,
size_t str_length);
void editorRowDelString(erow *row, int at, size_t str_length);
void editorRowDelChar(erow *row, int at);
char *editorPrompt(char *prompt, void (*callback)(char *, int));
undoAPI *undoStackGetLast();
undoAPI *stackPop(undoStack *stack);
void stackPush(undoStack *stack, undoAPI *undo);
void stackClear(undoStack *stack);
#define undoStackPop() stackPop(E.undoStack)
#define redoStackPop() stackPop(E.redoStack)
#define undoStackPush(undo) stackPush(E.undoStack, undo)
#define redoStackPush(undo) stackPush(E.redoStack, undo)
void abAppend(struct abuf *ab, const char *s, int len);
void abFree(struct abuf *ab);
void abAssign(struct abuf *ab, const char *s, int len);
#define max(a, b) ((a > b) ? a : b)
#define min(a, b) ((a < b) ? a : b)
/*** terminal ***/
void die(const char *s) {
// 最低限戻して終了させる
termsend("\x1b[2J", 4);
termsend("\x1b[H", 3);
perror(s);
exit(1);
}
void disableRawMode() {
// orig_termios への復旧を試みる
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &E.orig_termios) == -1) {
die("tcsetattr");
}
}
void enableRawMode() {
struct termios raw;
if (tcgetattr(STDIN_FILENO, &E.orig_termios) == -1)
die("tcgetattr");
atexit(disableRawMode);
raw = E.orig_termios;
raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
raw.c_oflag &= ~(OPOST);
raw.c_cflag |= (CS8);
raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
raw.c_cc[VMIN] = 0;
raw.c_cc[VTIME] = 1;
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1)
die("tcsetattr");
}
int editorReadKey() {
int nread;
char c;
while ((nread = termread(&c, 1)) != 1) {
if (nread == -1 && errno != EAGAIN)
die("read");
}
if (c == '\x1b') {
char seq[5];
if (termread(&seq[0], 1) != 1)
return '\x1b';
if (termread(&seq[1], 1) != 1)
return '\x1b';
if (seq[0] == '[') {
if (seq[1] >= '0' && seq[1] <= '9') {
if (termread(&seq[2], 1) != 1)
return '\x1b';
if (seq[2] == '~') {
switch (seq[1]) {
case '1':
return HOME_KEY;
case '3':
return DEL_KEY;
case '4':
return END_KEY;
case '5':
return PAGE_UP;
case '6':
return PAGE_DOWN;
case '7':
return HOME_KEY;
case '8':
return END_KEY;
}
}
if (seq[2] == ';') {
// Shift+矢印, Ctrl+矢印, Alt+矢印
if (termread(&seq[3], 1) != 1) {
return '\x1b';
}
if (termread(&seq[4], 1) != 1) {
return '\x1b';
}
switch (seq[3]) {
case '5': // CTRL
switch (seq[4]) {
case 'A':
return ARROW_UP_CTRL;
case 'B':
return ARROW_DOWN_CTRL;
case 'C':
return ARROW_RIGHT_CTRL;
case 'D':
return ARROW_LEFT_CTRL;
}
break;
case '6': // CTRL-SHIFT
switch (seq[4]) {
case 'C':
return ARROW_RIGHT_SHIFT_CTRL;
case 'D':
return ARROW_LEFT_SHIFT_CTRL;
}
break;
case '2':
switch (seq[4]) {
case 'A':
return ARROW_UP_SHIFT;
case 'B':
return ARROW_DOWN_SHIFT;
case 'C':
return ARROW_RIGHT_SHIFT;
case 'D':
return ARROW_LEFT_SHIFT;
}
break;
}
}
} else {
switch (seq[1]) {
case 'A':
return ARROW_UP;
case 'B':
return ARROW_DOWN;
case 'C':
return ARROW_RIGHT;
case 'D':
return ARROW_LEFT;
case 'H':
return HOME_KEY;
case 'F':
return END_KEY;
}
}
} else if (seq[0] == '0') {
switch (seq[1]) {
case 'H':
return HOME_KEY;
case 'F':
return END_KEY;
}
}
return '\x1b';
} else {
return c;
}
}
int getCursorPosition(int *rows, int *cols) {
char buf[32];
unsigned int i = 0;
if (termsend("\x1b[6n", 4) != 4)
return -1;
while (i < sizeof(buf) - 1) {
if (termread(&buf[i], 1) != 1)
break;
if (buf[i] == 'R')
break;
i++;
}
buf[i] = '\0';
if (buf[0] != '\x1b' || buf[1] != '[')
return -1;
if (sscanf(&buf[2], "%d;%d", rows, cols) != 2)
return -1;
editorReadKey();
return -1;
}
int getWindowSize(int *rows, int *cols) {
struct winsize ws;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
if (termsend("\x1b[999C\x1b[999B", 12) != 12)
return -1;
return getCursorPosition(rows, cols);
} else {
*cols = ws.ws_col;
*rows = ws.ws_row;
return 0;
}
}
/*** syntax highlighting ***/
// 区切りの概念を識別
int is_separator(int c) {
// strchr で出現位置を表せる
return isspace(c) || c == '\0' || strchr(",.()+-/*=~%<>[];", c) != NULL;
}
// 補完の場合. / を区切り文字としてしまうとファイル名補完まわりで問題.
int is_separator_for_complete(int c) {
return isspace(c) || c == '\0' || strchr(",.()+-*=~%<>[];", c) != NULL;
}
void editorUpdateSyntax(erow *row) {
// 長さ0 の行を realloc() できないので、こうやって動くようにする
row->hl = safe_realloc(row->hl, row->rbsize + 1);
// 何もなければHL_NORMAL 扱い
memset(row->hl, HL_NORMAL, row->rbsize);
if (E.syntax == NULL)
return;
char **keywords = E.syntax->keywords;
char *scs = E.syntax->singleline_comment_start;
char *mcs = E.syntax->multiline_comment_start;
char *mce = E.syntax->multiline_comment_end;
int scs_len = scs ? strlen(scs) : 0;
int mcs_len = mcs ? strlen(mcs) : 0;
int mce_len = mce ? strlen(mce) : 0;
int prev_sep = 1; // 前の文字が区切りか否か
int in_string = 0; // 文字列内にあるか否か
int in_comment = (row->idx > 0 && E.row[row->idx - 1].hl_open_comment);
int i = 0;
while (i < row->rbsize) {
char c = row->render[i];
unsigned char prev_hl = (i > 0) ? row->hl[i - 1] : HL_NORMAL;
if (scs_len && !in_string && !in_comment) {
// 最初のn byte しか比較しない. // かどうか.
if (!strncmp(&row->render[i], scs, scs_len)) {
memset(&row->hl[i], HL_COMMENT, row->rbsize - i);
break;
}
}
if (mcs_len && mce_len && !in_string) {
if (in_comment) {
row->hl[i] = HL_MLCOMMENT;
/* コメント終端を判定 */
if (!strncmp(&row->render[i], mce, mce_len)) {
memset(&row->hl[i], HL_COMMENT, mce_len);
i += mce_len;
in_comment = 0;
prev_sep = 1;
continue;
} else {
i++;
continue;
}
} else if (!strncmp(&row->render[i], mcs, mcs_len)) {
/* コメント起点を反転 */
memset(&row->hl[i], HL_MLCOMMENT, mcs_len);
i += mcs_len;
in_comment = 1;
continue;
}
}
if (E.syntax->flags & HL_HIGHLIGHT_STRINGS) {
if (in_string) {
row->hl[i] = HL_STRING;
if (c == '\\' && i + 1 < row->rbsize) {
row->hl[i + 1] = HL_STRING;
// \ の直後の文字は気にしない
i += 2;
continue;
}
if (c == in_string)
in_string = 0; // closing quote なら閉じる
i++;
prev_sep = 1; // 最後に閉じ括弧が区切り扱いされるように
continue;
} else {
if (c == '"' || c == '\'') {
// 始まるから開始する
in_string = c;
row->hl[i] = HL_STRING;
i++;
continue;
}
}
}
// 前の文字の種類
if (E.syntax->flags & HL_HIGHLIGHT_NUMBERS) { // 数値を強調するかどうか
// 区切られた後の数値
if ((isdigit(c) && (prev_sep || prev_hl == HL_NUMBER)) ||
(c == '.' && prev_hl == HL_NUMBER)) { // 小数
row->hl[i] = HL_NUMBER;
i++;
prev_sep = 0;
continue;
}
}
// 前が区切り文字でなければ、avoid などが問題となる
if (prev_sep) {
int j;
for (j = 0; keywords[j]; j++) { /* 最後はNULL だから問題ない */
int klen = strlen(keywords[j]);
/* 2種類目のキーワードには | がついているから */
int kw2 = keywords[j][klen - 1] == '|';
if (kw2)
klen--;
// \0 が区切り文字として認識されるから
if (!strncmp(&row->render[i], keywords[j], klen) &&
is_separator(row->render[i + klen])) {
memset(&row->hl[i], kw2 ? HL_KEYWORD2 : HL_KEYWORD1, klen);
i += klen;
break;
}
}
if (keywords[j] != NULL) {
prev_sep = 0; // 区切り
continue;
}
}
/* 残り */
prev_sep = is_separator(c);
i++;
}
int changed = (row->hl_open_comment != in_comment);
// hl_open_comment の状況は順伝搬してゆく
row->hl_open_comment = in_comment;
// コメント行扱い. コメント行かどうかが変わったときだけ
if (changed && row->idx + 1 < E.numrows)
editorUpdateSyntax(&E.row[row->idx + 1]);
}
int editorSyntaxToColor(int hl) {
switch (hl) {
case HL_COMMENT:
case HL_MLCOMMENT:
return 36; // cyan
case HL_KEYWORD1:
return 33; // yellow
case HL_KEYWORD2:
return 32; // green
case HL_STRING:
return 35; // magenta
case HL_NUMBER:
return 31; // red
case HL_MATCH:
return 34; // blue
default:
return 37; // white
}
}
void editorSelectSyntaxHighlight() {
E.syntax = NULL;
if (E.filename == NULL)
return;
// 右端にある '.' の位置を探す
char *ext = strrchr(E.filename, '.');
for (unsigned int j = 0; j < HLDB_ENTRIES; j++) {
struct editorSyntax *s = &HLDB[j];
unsigned int i = 0;
// 最後はNULL になるという規約に基き
while (s->filematch[i]) {
int is_ext = (s->filematch[i][0] == '.');
// 拡張子による判定
if ((is_ext && ext && !strcmp(ext, s->filematch[i])) ||
// 単に含まれているかの判定
(!is_ext && strstr(E.filename, s->filematch[i]))) {
E.syntax = s;
/* 改変後に Syntax を丸ごと計算し直す */
int filerow;
for (filerow = 0; filerow < E.numrows; filerow++) {
editorUpdateSyntax(&E.row[filerow]);
}
return;
}
i++;
}
}
}
/*** row operations ***/
int editorRowCxToBxRx(erow *row, const int cx, int *save_bx, int *save_rx) {
int bx = 0, rx = 0, cur_cx;
int width;
wchar_t chr;
for (cur_cx = 0; cur_cx < cx; cur_cx++) {
if (row->chars[bx] == '\t') {
// タブ文字
rx += (LJMP_TAB_STOP) - (rx % LJMP_TAB_STOP);
bx += 1;
continue;
}
// コードポイントのバイト数 see utf-8 (7)
if ((row->chars[bx] & 0x80) == 0) { // 0xxxxxxx
chr = row->chars[bx];
bx += 1;
} else if ((row->chars[bx] & 0xE0) == 0xC0) {
// 110xxxxx
chr = ((row->chars[bx] & 0x1F) << 6) + (row->chars[bx + 1] & 0x3F);
bx += 2;
} else if ((row->chars[bx] & 0xF0) == 0xE0) {
// 1110xxxx
chr = ((row->chars[bx] & 0x0F) << 12) +
((row->chars[bx + 1] & 0x3F) << 6) + (row->chars[bx + 2] & 0x3F);
bx += 3;
} else if ((row->chars[bx] & 0xF8) == 0xF0) {
// 11110xxx
chr = ((row->chars[bx] & 0x07) << 18) +
((row->chars[bx + 1] & 0x3F) << 12) +
((row->chars[bx + 2] & 0x3F) << 6) + (row->chars[bx + 3] & 0x3F);
bx += 4;
} else {
// Incorrect Sequence. Treat as Binary.
chr = row->chars[bx];
bx += 1;
}
// https://www.unicode.org/Public/UCD/latest/ucd/EastAsianWidth.txt
// これが本来必要かもしれない
width = wcwidth(chr);
if (width >= 0) {
rx += width;
}
// width < 0 when unprintable chars
if (bx >= row->bsize) {
break;
}
}
if (save_bx != NULL) {
*save_bx = bx;
}
if (save_rx != NULL) {
*save_rx = rx;
}
return bx;
}
int editorRowBxToCxRx(erow *row, int bx, int *optional_cx, int *optional_rx) {
int cur_cx = 0;
int cur_bx = 0;
int width;
wchar_t chr;
int rx = 0;
for (cur_cx = 0;; cur_cx++) {
if (row->chars[cur_bx] == '\t') {
// タブ文字
rx += (LJMP_TAB_STOP) - (rx % LJMP_TAB_STOP);
cur_bx += 1;
continue;
}
// コードポイントのバイト数 see utf-8 (7)
if ((row->chars[cur_bx] & 0x80) == 0) { // 0xxxxxxx
chr = row->chars[cur_bx];
cur_bx += 1;
} else if ((row->chars[cur_bx] & 0xE0) == 0xC0) {
// 110xxxxx
chr = ((row->chars[cur_bx] & 0x1F) << 6) +
(row->chars[cur_bx + 1] & 0x3F);
cur_bx += 2;
} else if ((row->chars[cur_bx] & 0xF0) == 0xE0) {
// 1110xxxx
chr = ((row->chars[cur_bx] & 0x0F) << 12) +
((row->chars[cur_bx + 1] & 0x3F) << 6) +
(row->chars[cur_bx + 2] & 0x3F);
cur_bx += 3;
} else if ((row->chars[cur_bx] & 0xF8) == 0xF0) {
// 11110xxx
chr = ((row->chars[cur_bx] & 0x07) << 18) +
((row->chars[cur_bx + 1] & 0x3F) << 12) +
((row->chars[cur_bx + 2] & 0x3F) << 6) +
(row->chars[cur_bx + 3] & 0x3F);
cur_bx += 4;
} else {
// Incorrect Sequence. Treat as Binary.
chr = row->chars[cur_bx];
cur_bx += 1;
}
// https://www.unicode.org/Public/UCD/latest/ucd/EastAsianWidth.txt
// これが本来必要かもしれない
width = wcwidth(chr);
if (width >= 0) {
rx += width;
}
// width < 0 when unprintable chars
if (cur_bx > bx) {
break;
}
}
if (optional_rx != NULL) {
*optional_rx = rx;
}
if (optional_cx != NULL) {
*optional_cx = cur_cx;
}
return cur_cx;
}
// editorRowCxToRx の逆演算
int editorRowRxToBx(erow *row, int rx) {
int cur_rx = 0;
int cx;
int width;
wchar_t chr;
for (cx = 0; cx < row->bsize; cx++) {
/* cx から rx への変換として加えていき...*/
if (row->chars[cx] == '\t') {
// タブ文字
// ここの -1 は rx++ があるから
cur_rx += (LJMP_TAB_STOP - 1) - (cur_rx % LJMP_TAB_STOP);
}
// cur_rx++;
// UTF-8 への対応
// コードポイントのバイト数 see utf-8 (7)
if ((row->chars[cx] & 0x80) == 0) { // 0xxxxxxx
chr = row->chars[cx];
} else if ((row->chars[cx] & 0xE0) == 0xC0) {
// 110xxxxx
chr = ((row->chars[cx] & 0x1F) << 6) + (row->chars[cx + 1] & 0x3F);
cx += 1;
} else if ((row->chars[cx] & 0xF0) == 0xE0) {
// 1110xxxx
chr = ((row->chars[cx] & 0x0F) << 12) +
((row->chars[cx + 1] & 0x3F) << 6) + (row->chars[cx + 2] & 0x3F);
cx += 2;
} else if ((row->chars[cx] & 0xF8) == 0xF0) {
// 11110xxx
chr = ((row->chars[cx] & 0x07) << 18) +
((row->chars[cx + 1] & 0x3F) << 12) +
((row->chars[cx + 2] & 0x3F) << 6) + (row->chars[cx + 3] & 0x3F);
cx += 3;
} else {
// 不正なシーケンス
puts("Incorrect Sequence.");
exit(-2);
}
width = wcwidth(chr);
if (width >= 0) {
cur_rx += width;
}
// 必ずここでひろわれるはず: 超えたら返す
if (cur_rx > rx)
return cx;
}
// ここの行にはたどりつかないはず
// assert(0);
return cx;
}
// rx が多バイト文字の途中といった中途半端な場所であるとき, 左側に寄せる
int editorRowRxBisectLeft(erow *row, int rx) {
for (int i = rx; i >= rx - 3; i--) {
// つまり、文字の1バイト目か否か
if (i >= row->bsize || !(row->render[i] >> 7 & 1) ||
(row->render[i] >> 6 & 1)) {
return i;
}
}
return rx;
}
// rx が多バイト文字の途中といった中途半端な場所であるとき, 右側に寄せる
int editorRowRxBisectRight(erow *row, int rbx) {
for (int i = rbx; i < rbx + 3; i++) {
// つまり、文字の1バイト目か否か
if (i >= row->bsize || !(row->render[i] >> 7 & 1) ||
(row->render[i] >> 6 & 1)) {
// TODO
return i;
}
}
assert(0);
return rbx;
}
// render の内容を埋める
void editorUpdateRow(erow *row) {
int tabs = 0;
int j;
row->indentations = 0;
for (j = 0; j < row->bsize; j++) {
// タブの数を数える
if (row->chars[j] == '\t') {
if (j == row->indentations) {
row->indentations++;
}
tabs++;
}
}
safe_free(row->render);
// 8 - 1 = 7 (1 分はすでにrow->bsize として確保してある)
row->render = safe_malloc(row->bsize + tabs * (LJMP_TAB_STOP - 1) + 1);
int idx = 0;
// 実体から表示に割り当てる
for (j = 0; j < row->bsize; j++) {
if (row->chars[j] == '\t') {
// タブが来たら" "で埋める. 丁度いい数になるまで合わせる
row->render[idx++] = ' ';
while (idx % LJMP_TAB_STOP != 0)
row->render[idx++] = ' ';
} else {
row->render[idx++] = row->chars[j];
}
}
row->render[idx] = '\0';
editorRowBxToCxRx(row, row->bsize, &row->csize, &row->rrsize);
row->rbsize = idx;
editorRowCxToBxRx(&E.row[E.cy], E.cx, &(E.bx), &(E.rx));
editorUpdateSyntax(row);
}
void editorAssignRow(int y_at, char *s, size_t len) {
if (y_at < 0 || y_at > E.numrows)
return;
editorRowAssignString(&E.row[y_at], s, len);
}
// 行の追記
void editorInsertRow(int at, char *s, size_t len) {
if (at < 0 || at > E.numrows)
return;
E.row = safe_realloc(E.row, sizeof(erow) * (E.numrows + 1));
memmove(&E.row[at + 1], &E.row[at], sizeof(erow) * (E.numrows - at));
// その後の行について index を改める
for (int j = at + 1; j <= E.numrows; j++)
E.row[j].idx++;
// 新規行の初期化
E.row[at].idx = at;
E.row[at].indentations = 0;
E.row[at].softtabstop = 0;
E.row[at].bsize = len;
E.row[at].chars = safe_malloc(len + 1);
memcpy(E.row[at].chars, s, len);
E.row[at].chars[len] = '\0';
E.row[at].rbsize = 0;
E.row[at].rrsize = 0;
E.row[at].csize = 0;
E.row[at].render = NULL;
E.row[at].hl = NULL;
E.row[at].hl_open_comment = 0;
E.numrows++;
editorUpdateRow(&E.row[at]);
E.dirty++; // こうしておくことで、改変具合が分かって便利
}
void editorFreeRow(erow *row) {
// row を削除
safe_free(row->render);
safe_free(row->chars);
safe_free(row->hl);
}
int editorDelRow(int at) {
// at にある行を削除
if (at < 0 || at >= E.numrows)
return -1;
// 1行しかない場合は、1行目を空行にする
if (at == 0) {
editorAssignRow(at, "", 0);
return 1;
}
editorFreeRow(&E.row[at]);
// 前の行に移動させてゆく
memmove(&E.row[at], &E.row[at + 1], sizeof(erow) * (E.numrows - at - 1));
for (int j = at; j < E.numrows; j++)
E.row[j].idx--;
E.numrows--;
E.dirty++;
return 0;
}
void editorRowAppendString(erow *row, char *s, size_t len) {
row->chars = safe_realloc(row->chars, row->bsize + len + 1);
// row->bsize 以降に文字列をつけ加える
memcpy(&row->chars[row->bsize], s, len);
row->bsize += len;
row->chars[row->bsize] = '\0';
editorUpdateRow(row);
E.dirty++;
}
void editorRowAssignString(erow *row, char *s, size_t len) {
row->chars = safe_realloc(row->chars, len + 1);
memcpy(row->chars, s, len);
row->bsize = len;
row->chars[row->bsize] = '\0';
editorUpdateRow(row);
E.dirty++;
}
void editorRowInsertString(erow *row, int at, const char *str,
size_t str_length) {
for (unsigned long i = 0; i < str_length; i++) {
editorRowInsertChar(row, at + i, str[i]);
}