source: trunk/minix/commands/elvis/move5.c@ 10

/* move5.c */

/* Author:
 *      Steve Kirkendall
 *      14407 SW Teal Blvd. #C
 *      Beaverton, OR 97005
 *      kirkenda@cs.pdx.edu
 */


/* This file contains the word-oriented movement functions */

#include "config.h"
#include "ctype.h"
#include "vi.h"

MARK    m_fword(m, cnt, cmd, prevkey)
        MARK    m;      /* movement is relative to this mark */
        long    cnt;    /* a numeric argument */
        int     cmd;    /* either 'w' or 'W' */
        int     prevkey;/* previous command... if 'c' then exclude whitespace */
{
        REG long        l;
        REG char        *text;
        REG int         i;

        DEFAULT(1);

        l = markline(m);
        pfetch(l);
        text = ptext + markidx(m);

#ifndef CRUNCH
        /* As a special case, "cw" or "cW" on whitespace without a count
         * treats the single whitespace character under the cursor as a word.
         */
        if (cnt == 1L && prevkey == 'c' && isspace(*text))
        {
                return m + 1L;
        }
#endif

        while (cnt-- > 0) /* yes, ASSIGNMENT! */
        {
                i = *text++;

                if (cmd == 'W')
                {
                        /* include any non-whitespace */
                        while (i && !isspace(i))
                        {
                                i = *text++;
                        }
                }
                else if (isalnum(i) || i == '_')
                {
                        /* include an alphanumeric word */
                        while (i && isalnum(i))
                        {
                                i = *text++;
                        }
                }
                else
                {
                        /* include contiguous punctuation */
                        while (i && !isalnum(i) && !isspace(i))
                        {
                                i = *text++;
                        }
                }

                /* if not part of "cw" or "cW" command... */
                if (prevkey != 'c' || cnt > 0)
                {
                        /* include trailing whitespace */
                        while (!i || isspace(i))
                        {
                                /* did we hit the end of this line? */
                                if (!i)
                                {
                                        /* "dw" shouldn't delete newline after word */
                                        if (prevkey && cnt == 0)
                                        {
                                                break;
                                        }

                                        /* move to next line, if there is one */
                                        l++;
                                        if (l > nlines)
                                        {
                                                return MARK_UNSET;
                                        }
                                        pfetch(l);
                                        text = ptext;
                                }

                                i = *text++;
                        }
                }
                text--;
        }

        /* if argument to operator, then back off 1 char since "w" and "W"
         * include the last char in the affected text.
         */
        if (prevkey)
        {
                text--;
        }

        /* construct a MARK for this place */
        m = buildmark(text);
        return m;
}


MARK    m_bword(m, cnt, cmd)
        MARK    m;      /* movement is relative to this mark */
        long    cnt;    /* a numeric argument */
        int     cmd;    /* either 'b' or 'B' */
{
        REG long        l;
        REG char        *text;

        DEFAULT(1);

        l = markline(m);
        pfetch(l);
        text = ptext + markidx(m);
        while (cnt-- > 0) /* yes, ASSIGNMENT! */
        {
                text--;

                /* include preceding whitespace */
                while (text < ptext || isspace(*text))
                {
                        /* did we hit the end of this line? */
                        if (text < ptext)
                        {
                                /* move to preceding line, if there is one */
                                l--;
                                if (l <= 0)
                                {
                                        return MARK_UNSET;
                                }
                                pfetch(l);
                                text = ptext + plen - 1;
                        }
                        else
                        {
                                text--;
                        }
                }

                if (cmd == 'B')
                {
                        /* include any non-whitespace */
                        while (text >= ptext && !isspace(*text))
                        {
                                text--;
                        }
                }
                else if (isalnum(*text) || *text == '_')
                {
                        /* include an alphanumeric word */
                        while (text >= ptext && isalnum(*text))
                        {
                                text--;
                        }
                }
                else
                {
                        /* include contiguous punctuation */
                        while (text >= ptext && !isalnum(*text) && !isspace(*text))
                        {
                                text--;
                        }
                }
                text++;
        }

        /* construct a MARK for this place */
        m = buildmark(text);
        return m;
}

MARK    m_eword(m, cnt, cmd)
        MARK    m;      /* movement is relative to this mark */
        long    cnt;    /* a numeric argument */
        int     cmd;    /* either 'e' or 'E' */
{
        REG long        l;
        REG char        *text;
        REG int         i;

        DEFAULT(1);

        l = markline(m);
        pfetch(l);
        text = ptext + markidx(m);
        while (cnt-- > 0) /* yes, ASSIGNMENT! */
        {
                if (*text)
                        text++;
                i = *text++;

                /* include preceding whitespace */
                while (!i || isspace(i))
                {
                        /* did we hit the end of this line? */
                        if (!i)
                        {
                                /* move to next line, if there is one */
                                l++;
                                if (l > nlines)
                                {
                                        return MARK_UNSET;
                                }
                                pfetch(l);
                                text = ptext;
                        }

                        i = *text++;
                }

                if (cmd == 'E')
                {
                        /* include any non-whitespace */
                        while (i && !isspace(i))
                        {
                                i = *text++;
                        }
                }
                else if (isalnum(i) || i == '_')
                {
                        /* include an alphanumeric word */
                        while (i && isalnum(i))
                        {
                                i = *text++;
                        }
                }
                else
                {
                        /* include contiguous punctuation */
                        while (i && !isalnum(i) && !isspace(i))
                        {
                                i = *text++;
                        }
                }
                text -= 2;
        }

        /* construct a MARK for this place */
        m = buildmark(text);
        return m;
}