/*	$OpenBSD: v_word.c,v 1.7 2014/11/12 04:28:41 bentley Exp $	*/

/*-

 * Copyright (c) 1992, 1993, 1994

 *	The Regents of the University of California.  All rights reserved.

 * Copyright (c) 1992, 1993, 1994, 1995, 1996

 *	Keith Bostic.  All rights reserved.

 *

 * See the LICENSE file for redistribution information.

 */

#include "config.h"

#include <sys/types.h>

#include <sys/queue.h>

#include <sys/time.h>

#include <bitstring.h>

#include <ctype.h>

#include <limits.h>

#include <stdio.h>

#include "../common/common.h"

#include "vi.h"

/*

 * There are two types of "words".  Bigwords are easy -- groups of anything

 * delimited by whitespace.  Normal words are trickier.  They are either a

 * group of characters, numbers and underscores, or a group of anything but,

 * delimited by whitespace.  When for a word, if you're in whitespace, it's

 * easy, just remove the whitespace and go to the beginning or end of the

 * word.  Otherwise, figure out if the next character is in a different group.

 * If it is, go to the beginning or end of that group, otherwise, go to the

 * beginning or end of the current group.  The historic version of vi didn't

 * get this right, so, for example, there were cases where "4e" was not the

 * same as "eeee" -- in particular, single character words, and commands that

 * began in whitespace were almost always handled incorrectly.  To get it right

 * you have to resolve the cursor after each search so that the look-ahead to

 * figure out what type of "word" the cursor is in will be correct.

 *

 * Empty lines, and lines that consist of only white-space characters count

 * as a single word, and the beginning and end of the file counts as an

 * infinite number of words.

 *

 * Movements associated with commands are different than movement commands.

 * For example, in "abc  def", with the cursor on the 'a', "cw" is from

 * 'a' to 'c', while "w" is from 'a' to 'd'.  In general, trailing white

 * space is discarded from the change movement.  Another example is that,

 * in the same string, a "cw" on any white space character replaces that

 * single character, and nothing else.  Ain't nothin' in here that's easy.

 *

 * One historic note -- in the original vi, the 'w', 'W' and 'B' commands

 * would treat groups of empty lines as individual words, i.e. the command

 * would move the cursor to each new empty line.  The 'e' and 'E' commands

 * would treat groups of empty lines as a single word, i.e. the first use

 * would move past the group of lines.  The 'b' command would just beep at

 * you, or, if you did it from the start of the line as part of a motion

 * command, go absolutely nuts.  If the lines contained only white-space

 * characters, the 'w' and 'W' commands would just beep at you, and the 'B',

 * 'b', 'E' and 'e' commands would treat the group as a single word, and

 * the 'B' and 'b' commands will treat the lines as individual words.  This

 * implementation treats all of these cases as a single white-space word.

 */

enum which {BIGWORD, LITTLEWORD};

static int bword(SCR *, VICMD *, enum which);

static int eword(SCR *, VICMD *, enum which);

static int fword(SCR *, VICMD *, enum which);

/*

 * v_wordW -- [count]W

 *	Move forward a bigword at a time.

 *

 * PUBLIC: int v_wordW(SCR *, VICMD *);

 */

int

v_wordW(SCR *sp, VICMD *vp)

{

}

/*

 * v_wordw -- [count]w

 *	Move forward a word at a time.

 *

 * PUBLIC: int v_wordw(SCR *, VICMD *);

 */

int

v_wordw(SCR *sp, VICMD *vp)

{

}

/*

 * fword --

 *	Move forward by words.

 */

static int

fword(SCR *sp, VICMD *vp, enum which type)

{

	enum { INWORD, NOTWORD } state;

	u_long cnt;

	/*

	 * If in white-space:

	 *	If the count is 1, and it's a change command, we're done.

	 *	Else, move to the first non-white-space character, which

	 *	counts as a single word move.  If it's a motion command,

	 *	don't move off the end of the line.

	 */

				goto ret;

			}

		}

	}

	/*

	 * Cyclically move to the next word -- this involves skipping

	 * over word characters and then any trailing non-word characters.

	 * Note, for the 'w' command, the definition of a word keeps

	 * switching.

	 */

					goto ret;

					break;

			}

			/*

			 * If a motion command and we're at the end of the

			 * last word, we're done.  Delete and yank eat any

			 * trailing blanks, but we don't move off the end

			 * of the line regardless.

			 */

				break;

			}

			/* Eat whitespace characters. */

				goto ret;

		}

	else

					goto ret;

					break;

						break;

				} else

						break;

			}

			/* See comment above. */

				break;

			}

			/* Eat whitespace characters. */

				goto ret;

		}

	/*

	 * If we didn't move, we must be at EOF.

	 *

	 * !!!

	 * That's okay for motion commands, however.

	 */

	}

	/* Adjust the end of the range for motion commands. */

	/*

	 * Non-motion commands move to the end of the range.  Delete

	 * and yank stay at the start, ignore others.

	 */

}

/*

 * v_wordE -- [count]E

 *	Move forward to the end of the bigword.

 *

 * PUBLIC: int v_wordE(SCR *, VICMD *);

 */

int

v_wordE(SCR *sp, VICMD *vp)

{

}

/*

 * v_worde -- [count]e

 *	Move forward to the end of the word.

 *

 * PUBLIC: int v_worde(SCR *, VICMD *);

 */

int

v_worde(SCR *sp, VICMD *vp)

{

}

/*

 * eword --

 *	Move forward to the end of the word.

 */

static int

eword(SCR *sp, VICMD *vp, enum which type)

{

	enum { INWORD, NOTWORD } state;

	u_long cnt;

	/*

	 * !!!

	 * If in whitespace, or the next character is whitespace, move past

	 * it.  (This doesn't count as a word move.)  Stay at the character

	 * past the current one, it sets word "state" for the 'e' command.

	 */

			goto start;

	}

	/*

	 * Cyclically move to the next word -- this involves skipping

	 * over word characters and then any trailing non-word characters.

	 * Note, for the 'e' command, the definition of a word keeps

	 * switching.

	 */

					goto ret;

					break;

			}

			/*

			 * When we reach the start of the word after the last

			 * word, we're done.  If we changed state, back up one

			 * to the end of the previous word.

			 */

				break;

			}

			/* Eat whitespace characters. */

				goto ret;

		}

	else

					goto ret;

					break;

						break;

				} else

						break;

			}

			/* See comment above. */

				break;

			}

			/* Eat whitespace characters. */

				goto ret;

		}

	/*

	 * If we didn't move, we must be at EOF.

	 *

	 * !!!

	 * That's okay for motion commands, however.

	 */

	}

	/* Set the end of the range for motion commands. */

	/*

	 * Non-motion commands move to the end of the range.

	 * Delete and yank stay at the start, ignore others.

	 */

}

/*

 * v_WordB -- [count]B

 *	Move backward a bigword at a time.

 *

 * PUBLIC: int v_wordB(SCR *, VICMD *);

 */

int

v_wordB(SCR *sp, VICMD *vp)

{

}

/*

 * v_wordb -- [count]b

 *	Move backward a word at a time.

 *

 * PUBLIC: int v_wordb(SCR *, VICMD *);

 */

int

v_wordb(SCR *sp, VICMD *vp)

{

}

/*

 * bword --

 *	Move backward by words.

 */

static int

bword(SCR *sp, VICMD *vp, enum which type)

{

	enum { INWORD, NOTWORD } state;

	u_long cnt;

	/*

	 * !!!

	 * If in whitespace, or the previous character is whitespace, move

	 * past it.  (This doesn't count as a word move.)  Stay at the

	 * character before the current one, it sets word "state" for the

	 * 'b' command.

	 */

			goto start;

	}

	/*

	 * Cyclically move to the beginning of the previous word -- this

	 * involves skipping over word characters and then any trailing

	 * non-word characters.  Note, for the 'b' command, the definition

	 * of a word keeps switching.

	 */

					goto ret;

					break;

			}

			/*

			 * When we reach the end of the word before the last

			 * word, we're done.  If we changed state, move forward

			 * one to the end of the next word.

			 */

				break;

			}

			/* Eat whitespace characters. */

				goto ret;

		}

	else

					goto ret;

					break;

						break;

				} else

						break;

			}

			/* See comment above. */

				break;

			}

			/* Eat whitespace characters. */

				goto ret;

		}

	/* If we didn't move, we must be at SOF. */

	}

	/* Set the end of the range for motion commands. */

	/*

	 * All commands move to the end of the range.  Motion commands

	 * adjust the starting point to the character before the current

	 * one.

	 *

	 * !!!

	 * The historic vi didn't get this right -- the `yb' command yanked

	 * the right stuff and even updated the cursor value, but the cursor

	 * was not actually updated on the screen.

	 */

}