charset.c
资源名称:vim53src.zip [点击查看]
上传用户:gddssl
上传日期:2007-01-06
资源大小:1003k
文件大小:18k
源码类别:
编辑器/阅读器
开发平台:
DOS
- /* 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.
- */
- #include "vim.h"
- /*
- * chartab[] is used
- * - to quickly recognize ID characters
- * - to quickly recognize file name characters
- * - to quickly recognize printable characters
- * - to store the size of a character on the screen: Printable is 1 position,
- * 2 otherwise
- */
- static int chartab_initialized = FALSE;
- /*
- * init_chartab(): Fill chartab[] with flags for ID and file name characters
- * and the size of characters on the screen (1 or 2 positions).
- * Also fills b_chartab[] with flags for keyword characters for current
- * buffer.
- *
- * Return FAIL if 'iskeyword', 'isident', 'isfname' or 'isprint' option has an
- * error, OK otherwise.
- */
- int
- init_chartab()
- {
- int c;
- int c2;
- char_u *p;
- int i;
- int tilde;
- int do_isalpha;
- /*
- * Set the default size for printable characters:
- * From <Space> to '~' is 1 (printable), others are 2 (not printable).
- * This also inits all 'isident' and 'isfname' flags to FALSE.
- */
- c = 0;
- while (c < ' ')
- chartab[c++] = 2;
- while (c <= '~')
- chartab[c++] = 1 + CHAR_IP;
- #ifdef FKMAP
- if (p_altkeymap)
- {
- while (c < YE)
- chartab[c++] = 1 + CHAR_IP;
- }
- #endif
- while (c < 256)
- chartab[c++] = 2;
- /*
- * Init word char flags all to FALSE
- */
- if (curbuf != NULL)
- for (c = 0; c < 256; ++c)
- curbuf->b_chartab[c] = FALSE;
- #ifdef LISPINDENT
- /*
- * In lisp mode the '-' character is included in keywords.
- */
- if (curbuf->b_p_lisp)
- curbuf->b_chartab['-'] = TRUE;
- #endif
- /* Walk through the 'isident', 'iskeyword', 'isfname' and 'isprint'
- * options Each option is a list of characters, character numbers or
- * ranges, separated by commas, e.g.: "200-210,x,#-178,-"
- */
- for (i = 0; i < 4; ++i)
- {
- if (i == 0)
- p = p_isi; /* first round: 'isident' */
- else if (i == 1)
- p = p_isp; /* second round: 'isprint' */
- else if (i == 2)
- p = p_isf; /* third round: 'isfname' */
- else /* i == 3 */
- p = curbuf->b_p_isk; /* fourth round: 'iskeyword' */
- while (*p)
- {
- tilde = FALSE;
- do_isalpha = FALSE;
- if (*p == '^' && p[1] != NUL)
- {
- tilde = TRUE;
- ++p;
- }
- if (isdigit(*p))
- c = getdigits(&p);
- else
- c = *p++;
- c2 = -1;
- if (*p == '-' && p[1] != NUL)
- {
- ++p;
- if (isdigit(*p))
- c2 = getdigits(&p);
- else
- c2 = *p++;
- }
- if (c <= 0 || (c2 < c && c2 != -1) || c2 >= 256 ||
- !(*p == NUL || *p == ','))
- return FAIL;
- if (c2 == -1) /* not a range */
- {
- /*
- * A single '@' (not "@-@"):
- * Decide on letters being ID/printable/keyword chars with
- * standard function isalpha(). This takes care of locale.
- */
- if (c == '@')
- {
- do_isalpha = TRUE;
- c = 1;
- c2 = 255;
- }
- else
- c2 = c;
- }
- while (c <= c2)
- {
- if (!do_isalpha || isalpha(c)
- #ifdef FKMAP
- || (p_altkeymap && (F_isalpha(c) || F_isdigit(c)))
- #endif
- )
- {
- if (i == 0) /* (re)set ID flag */
- {
- if (tilde)
- chartab[c] &= ~CHAR_ID;
- else
- chartab[c] |= CHAR_ID;
- }
- else if (i == 1) /* set printable to 1 or 2 */
- {
- if (c < ' ' || c > '~'
- #ifdef FKMAP
- || (p_altkeymap
- && (F_isalpha(c) || F_isdigit(c)))
- #endif
- )
- {
- if (tilde)
- {
- chartab[c] = (chartab[c] & ~CHAR_MASK) + 2;
- chartab[c] &= ~CHAR_IP;
- }
- else
- {
- chartab[c] = (chartab[c] & ~CHAR_MASK) + 1;
- chartab[c] |= CHAR_IP;
- }
- }
- }
- else if (i == 2) /* (re)set fname flag */
- {
- if (tilde)
- chartab[c] &= ~CHAR_IF;
- else
- chartab[c] |= CHAR_IF;
- }
- else /* i == 3 */ /* (re)set keyword flag */
- curbuf->b_chartab[c] = !tilde;
- }
- ++c;
- }
- p = skip_to_option_part(p);
- }
- }
- chartab_initialized = TRUE;
- return OK;
- }
- /*
- * Translate any special characters in buf[bufsize].
- * If there is not enough room, not all characters will be translated.
- */
- void
- trans_characters(buf, bufsize)
- char_u *buf;
- int bufsize;
- {
- int len; /* length of string needing translation */
- int room; /* room in buffer after string */
- char_u *new; /* translated character */
- int new_len; /* length of new[] */
- len = STRLEN(buf);
- room = bufsize - len;
- while (*buf)
- {
- new = transchar(*buf);
- new_len = STRLEN(new);
- if (new_len > 1)
- {
- room -= new_len - 1;
- if (room <= 0)
- return;
- mch_memmove(buf + new_len, buf + 1, (size_t)len);
- }
- mch_memmove(buf, new, (size_t)new_len);
- buf += new_len;
- --len;
- }
- }
- /*
- * Catch 22: chartab[] can't be initialized before the options are
- * initialized, and initializing options may cause transchar() to be called!
- * When chartab_initialized == FALSE don't use chartab[].
- */
- char_u *
- transchar(c)
- int c;
- {
- static char_u buf[5];
- int i;
- i = 0;
- if (IS_SPECIAL(c)) /* special key code, display as ~@ char */
- {
- buf[0] = '~';
- buf[1] = '@';
- i = 2;
- c = K_SECOND(c);
- }
- if ((!chartab_initialized && ((c >= ' ' && c <= '~')
- #ifdef FKMAP
- || F_ischar(c)
- #endif
- )) || (chartab[c] & CHAR_IP)) /* printable character */
- {
- buf[i] = c;
- buf[i + 1] = NUL;
- }
- else
- transchar_nonprint(buf + i, c);
- return buf;
- }
- void
- transchar_nonprint(buf, c)
- char_u *buf;
- int c;
- {
- if (c <= 0x7f) /* 0x00 - 0x1f and 0x7f */
- {
- if (c == NL)
- c = NUL; /* we use newline in place of a NUL */
- buf[0] = '^';
- buf[1] = c ^ 0x40; /* DEL displayed as ^? */
- buf[2] = NUL;
- }
- else if (c >= ' ' + 0x80 && c <= '~' + 0x80) /* 0xa0 - 0xfe */
- {
- buf[0] = '|';
- buf[1] = c - 0x80;
- buf[2] = NUL;
- }
- else /* 0x80 - 0x9f and 0xff */
- {
- buf[0] = '~';
- buf[1] = (c - 0x80) ^ 0x40; /* 0xff displayed as ~? */
- buf[2] = NUL;
- }
- }
- /*
- * return the number of characters 'c' will take on the screen
- * This is used very often, keep it fast!!!
- */
- int
- charsize(c)
- int c;
- {
- if (IS_SPECIAL(c))
- return (chartab[K_SECOND(c)] & CHAR_MASK) + 2;
- return (chartab[c] & CHAR_MASK);
- }
- /*
- * Return the number of characters string 's' will take on the screen,
- * counting TABs as two characters: "^I".
- */
- int
- vim_strsize(s)
- char_u *s;
- {
- int len = 0;
- while (*s)
- len += charsize(*s++);
- return len;
- }
- /*
- * Return the number of characters 'c' will take on the screen, taking
- * into account the size of a tab.
- * Use a define to make it fast, this is used very often!!!
- * Also see getvcol() below.
- */
- #define RET_WIN_BUF_CHARTABSIZE(wp, buf, c, col)
- if ((c) == TAB && (!(wp)->w_p_list || lcs_tab1))
- {
- int ts;
- ts = (buf)->b_p_ts;
- return (int)(ts - (col % ts));
- }
- else
- return charsize(c);
- int
- chartabsize(c, col)
- int c;
- colnr_t col;
- {
- RET_WIN_BUF_CHARTABSIZE(curwin, curbuf, c, col)
- }
- int
- win_chartabsize(wp, c, col)
- WIN *wp;
- int c;
- colnr_t col;
- {
- RET_WIN_BUF_CHARTABSIZE(wp, wp->w_buffer, c, col)
- }
- /*
- * return the number of characters the string 's' will take on the screen,
- * taking into account the size of a tab
- */
- int
- linetabsize(s)
- char_u *s;
- {
- colnr_t col = 0;
- while (*s != NUL)
- col += lbr_chartabsize(s++, col);
- return (int)col;
- }
- /*
- * Like linetabsize(), but for a given window instead of the current one.
- */
- int
- win_linetabsize(wp, s)
- WIN *wp;
- char_u *s;
- {
- colnr_t col = 0;
- while (*s != NUL)
- col += win_lbr_chartabsize(wp, s++, col, NULL);
- return (int)col;
- }
- /*
- * return TRUE if 'c' is a normal identifier character
- * letters and characters from 'isident' option.
- */
- int
- vim_isIDc(c)
- int c;
- {
- return (c < 0x100 && (chartab[c] & CHAR_ID));
- }
- /*
- * return TRUE if 'c' is a keyword character: Letters and characters from
- * 'iskeyword' option for current buffer.
- */
- int
- vim_iswordc(c)
- int c;
- {
- return (c < 0x100 && curbuf->b_chartab[c]);
- }
- int
- vim_iswordc_buf(c, buf)
- int c;
- BUF *buf;
- {
- return (c < 0x100 && buf->b_chartab[c]);
- }
- /*
- * return TRUE if 'c' is a valid file-name character
- */
- int
- vim_isfilec(c)
- int c;
- {
- return (c < 0x100 && (chartab[c] & CHAR_IF));
- }
- /*
- * return TRUE if 'c' is a printable character
- */
- int
- vim_isprintc(c)
- int c;
- {
- return (c < 0x100 && (chartab[c] & CHAR_IP));
- }
- /*
- * return TRUE if 'c' is a printable character
- *
- * No check for (c < 0x100) to make it a bit faster.
- * This is the most often used function, keep it fast!
- */
- int
- safe_vim_isprintc(c)
- int c;
- {
- return (chartab[c] & CHAR_IP);
- }
- /*
- * like chartabsize(), but also check for line breaks on the screen
- */
- int
- lbr_chartabsize(s, col)
- unsigned char *s;
- colnr_t col;
- {
- if (!curwin->w_p_lbr && *p_sbr == NUL)
- {
- RET_WIN_BUF_CHARTABSIZE(curwin, curbuf, *s, col)
- }
- return win_lbr_chartabsize(curwin, s, col, NULL);
- }
- /*
- * This function is used very often, keep it fast!!!!
- * Warning: *head is only set if it's a non-zero value, init to 0 before
- * calling.
- */
- int
- win_lbr_chartabsize(wp, s, col, head)
- WIN *wp;
- unsigned char *s;
- colnr_t col;
- int *head;
- {
- int c = *s;
- int size;
- colnr_t col2;
- colnr_t colmax;
- int added;
- int numberextra;
- /*
- * No 'linebreak' and 'showbreak': return quickly.
- */
- if (!wp->w_p_lbr && *p_sbr == NUL)
- {
- RET_WIN_BUF_CHARTABSIZE(wp, wp->w_buffer, c, col)
- }
- /*
- * First get normal size, without 'linebreak'
- */
- size = win_chartabsize(wp, c, col);
- /*
- * If 'linebreak' set check at a blank before a non-blank if the line needs a
- * break here
- */
- if (wp->w_p_lbr && vim_isbreak(c) && !vim_isbreak(s[1]) &&
- !wp->w_p_list && wp->w_p_wrap)
- {
- numberextra = wp->w_p_nu? 8: 0;
- /* count all characters from first non-blank after a blank up to next
- * non-blank after a blank */
- col2 = col;
- colmax = (((col + numberextra) / Columns) + 1) * Columns;
- while ((c = *++s) != NUL && (vim_isbreak(c)
- || (!vim_isbreak(c) && (col2 == col || !vim_isbreak(s[-1])))))
- {
- col2 += win_chartabsize(wp, c, col2);
- if (col2 + numberextra >= colmax) /* doesn't fit */
- {
- size = Columns - ((col + numberextra) % Columns);
- break;
- }
- }
- }
- /*
- * May have to add something for 'showbreak' string at start of line
- * Set *head to the size of what we add.
- */
- added = 0;
- if (*p_sbr != NUL && wp->w_p_wrap && col)
- {
- numberextra = wp->w_p_nu? 8: 0;
- col = (col + numberextra) % Columns;
- if (col == 0 || col + size > (colnr_t)Columns)
- {
- added = STRLEN(p_sbr);
- size += added;
- if (col != 0)
- added = 0;
- }
- }
- if (head != NULL)
- *head = added;
- return size;
- }
- /*
- * Get virtual column number of pos.
- * start: on the first position of this character (TAB, ctrl)
- * cursor: where the cursor is on this character (first char, except for TAB)
- * end: on the last position of this character (TAB, ctrl)
- *
- * This is used very often, keep it fast!
- */
- void
- getvcol(wp, pos, start, cursor, end)
- WIN *wp;
- FPOS *pos;
- colnr_t *start;
- colnr_t *cursor;
- colnr_t *end;
- {
- int col;
- colnr_t vcol;
- char_u *ptr;
- int incr;
- int head;
- int ts = wp->w_buffer->b_p_ts;
- int c;
- vcol = 0;
- ptr = ml_get_buf(wp->w_buffer, pos->lnum, FALSE);
- /*
- * This function is used very often, do some speed optimizations.
- * When 'list', 'linebreak' and 'showbreak' are not set use a simple loop.
- */
- if ((!wp->w_p_list || lcs_tab1) && !wp->w_p_lbr && *p_sbr == NUL)
- {
- head = 0;
- for (col = pos->col; ; --col, ++ptr)
- {
- c = *ptr;
- /* make sure we don't go past the end of the line */
- if (c == NUL)
- {
- incr = 1; /* NUL at end of line only takes one column */
- break;
- }
- /* A tab gets expanded, depending on the current column */
- if (c == TAB)
- incr = ts - (vcol % ts);
- else
- incr = CHARSIZE(c);
- if (col == 0) /* character at pos.col */
- break;
- vcol += incr;
- }
- }
- else
- {
- for (col = pos->col; ; --col, ++ptr)
- {
- /* A tab gets expanded, depending on the current column */
- head = 0;
- incr = win_lbr_chartabsize(wp, ptr, vcol, &head);
- /* make sure we don't go past the end of the line */
- if (*ptr == NUL)
- {
- incr = 1; /* NUL at end of line only takes one column */
- break;
- }
- if (col == 0) /* character at pos.col */
- break;
- vcol += incr;
- }
- }
- if (start != NULL)
- *start = vcol + head;
- if (end != NULL)
- *end = vcol + incr - 1;
- if (cursor != NULL)
- {
- if (*ptr == TAB && (State & NORMAL) && !wp->w_p_list
- && !(VIsual_active && *p_sel == 'e'))
- *cursor = vcol + incr - 1; /* cursor at end */
- else
- *cursor = vcol + head; /* cursor at start */
- }
- }
- /*
- * Get the most left and most right virtual column of pos1 and pos2.
- * Used for Visual block mode.
- */
- void
- getvcols(pos1, pos2, left, right)
- FPOS *pos1, *pos2;
- colnr_t *left, *right;
- {
- colnr_t l1, l2, r1, r2;
- getvcol(curwin, pos1, &l1, NULL, &r1);
- getvcol(curwin, pos2, &l2, NULL, &r2);
- if (l1 < l2)
- *left = l1;
- else
- *left = l2;
- if (r1 > r2)
- *right = r1;
- else
- *right = r2;
- }
- /*
- * skipwhite: skip over ' ' and 't'.
- */
- char_u *
- skipwhite(p)
- char_u *p;
- {
- while (vim_iswhite(*p)) /* skip to next non-white */
- ++p;
- return p;
- }
- /*
- * skipdigits: skip over digits;
- */
- char_u *
- skipdigits(p)
- char_u *p;
- {
- while (isdigit(*p)) /* skip to next non-digit */
- ++p;
- return p;
- }
- /*
- * vim_isdigit: version of isdigit() that can handle characters > 0x100.
- */
- int
- vim_isdigit(c)
- int c;
- {
- return (c > 0 && c < 0x100 && isdigit(c));
- }
- /*
- * skiptowhite: skip over text until ' ' or 't' or NUL.
- */
- char_u *
- skiptowhite(p)
- char_u *p;
- {
- while (*p != ' ' && *p != 't' && *p != NUL)
- ++p;
- return p;
- }
- /*
- * skiptowhite_esc: Like skiptowhite(), but also skip escaped chars
- */
- char_u *
- skiptowhite_esc(p)
- char_u *p;
- {
- while (*p != ' ' && *p != 't' && *p != NUL)
- {
- if ((*p == '\' || *p == Ctrl('V')) && *(p + 1) != NUL)
- ++p;
- ++p;
- }
- return p;
- }
- /*
- * Getdigits: Get a number from a string and skip over it.
- *
- * Note: the argument is a pointer to a char_u pointer!
- */
- long
- getdigits(pp)
- char_u **pp;
- {
- char_u *p;
- long retval;
- p = *pp;
- retval = atol((char *)p);
- p = skipdigits(p); /* skip to next non-digit */
- *pp = p;
- return retval;
- }
- /*
- * Return TRUE if "lbuf" is empty or only contains blanks.
- */
- int
- vim_isblankline(lbuf)
- char_u *lbuf;
- {
- char_u *p;
- p = skipwhite(lbuf);
- return (*p == NUL || *p == 'r' || *p == 'n');
- }
- /*
- * Convert a string into a long and/or unsigned long, taking care of
- * hexadecimal and octal numbers.
- * If "hexp" is not NULL, returns a flag to indicate the type of the number:
- * 0 decimal
- * '0' octal
- * 'X' hex
- * 'x' hex
- * If "len" is not NULL, the length of the number in characters is returned.
- * If "nptr" is not NULL, the signed result is returned in it.
- * If "unptr" is not NULL, the unsigned result is returned in it.
- */
- void
- vim_str2nr(start, hexp, len, dooct, dohex, nptr, unptr)
- char_u *start;
- int *hexp; /* return: type of number 0 = decimal, 'x'
- or 'X' is hex, '0' = octal */
- int *len; /* return: detected length of number */
- int dooct; /* recognize octal number */
- int dohex; /* recognize hex number */
- long *nptr; /* return: signed result */
- unsigned long *unptr; /* return: unsigned result */
- {
- char_u *ptr = start;
- int hex = 0; /* default is decimal */
- int negative = FALSE;
- long n = 0;
- unsigned long un = 0;
- if (ptr[0] == '-')
- {
- negative = TRUE;
- ++ptr;
- }
- if (ptr[0] == '0') /* could be hex or octal */
- {
- hex = ptr[1];
- if (dohex && (hex == 'X' || hex == 'x') && isxdigit(ptr[2]))
- ptr += 2; /* hexadecimal */
- else
- {
- if (dooct && isdigit(hex))
- hex = '0'; /* octal */
- else
- hex = 0; /* 0 by itself is decimal */
- }
- }
- /*
- * Do the string-to-numeric conversion "manually" to avoid sscanf quirks.
- */
- if (hex)
- {
- if (hex == '0')
- {
- /* octal */
- while ('0' <= *ptr && *ptr <= '7')
- {
- n = 8 * n + (long)(*ptr - '0');
- un = 8 * un + (unsigned long)(*ptr - '0');
- ++ptr;
- }
- }
- else
- {
- /* hex */
- while (isxdigit(*ptr))
- {
- n = 16 * n + (long)hex2nr(*ptr);
- un = 16 * un + (unsigned long)hex2nr(*ptr);
- ++ptr;
- }
- }
- }
- else
- {
- /* decimal */
- while (isdigit(*ptr))
- {
- n = 10 * n + (long)(*ptr - '0');
- un = 10 * un + (unsigned long)(*ptr - '0');
- ++ptr;
- }
- }
- if (!hex && negative) /* account for leading '-' for decimal numbers */
- n = -n;
- if (hexp != NULL)
- *hexp = hex;
- if (len != NULL)
- *len = ptr - start;
- if (nptr != NULL)
- *nptr = n;
- if (unptr != NULL)
- *unptr = un;
- }
- /*
- * Return the value of a single hex character.
- * Only valid when the argument is '0' - '9', 'A' - 'F' or 'a' - 'f'.
- */
- int
- hex2nr(c)
- int c;
- {
- if (c >= 'a')
- return c - 'a' + 10;
- if (c >= 'A')
- return c - 'A' + 10;
- return c - '0';
- }