line_edit.c

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/***************************************************************************
 *   Copyright (C) 2004, 2006 Symbian Software Ltd.                        *
 *   All rights reserved.                                                  *
 *                                                                         *
 *   Contributed originally by Mike Kinghan, imk@strudl.org                *
 *                                                                         *
 *   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.  *
 *                                                                         *
 *   Neither the name of Symbian Software Ltd. nor the names of its        *
 *   contributors may be used to endorse or promote products derived from  *
 *   this software without specific prior written permission.              *
 *                                                                         *
 *   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.                                                               *
 *                                                                         *
 **************************************************************************/
#include "line_edit.h"
#include "io.h"
#include "report.h"
#include "line_despatch.h"



#define DELETE_CHARS(start,end) memset(start,DELETEABLE_CHR,end - start)


static void
tail_edit(char *where, const char *what)
{
    assert(LINE_START <= where &&
           where < LINE_END);
    ensure_buf(strlen(what));
    strcpy(where,what);
}

/* API ********************************************************************/

void
keywordedit(const char *replacement)
{
    tail_edit(GET_PUBLIC(line_edit,keyword),replacement);
    ++SET_PUBLIC(line_despatch,lines_changed);
    print();
}


void
delete_paren(size_t lparen_off, size_t rparen_off)
{
    char * lparen = LINE_START + lparen_off;
    char * rparen = LINE_START + rparen_off;
    for( ;*lparen != '(' && lparen < rparen; ++lparen){}
    for( ;*rparen != ')' && rparen > lparen; --rparen){}
    if (*lparen == '(' && *rparen == ')' ) {
        if ((!is_symbol_inner_char(lparen[-1]) ||
                !is_symbol_inner_char(lparen[1]))
                &&
                (!is_symbol_inner_char(rparen[-1]) ||
                 !is_symbol_inner_char(rparen[1]))) {
            *lparen = DELETEABLE_LPAREN;
            *rparen = DELETEABLE_RPAREN;
            ++SET_PUBLIC(line_edit,parens_deleted);
        }
    }
}

extern void
restore_paren(size_t lparen_off, size_t rparen_off)
{
    char * lparen = LINE_START + lparen_off;
    char * rparen = LINE_START + rparen_off;
    for( ;*lparen != DELETEABLE_LPAREN && lparen < rparen; ++lparen){}
    for( ;*rparen != DELETEABLE_RPAREN && rparen > lparen; --rparen){}
    if (*lparen == DELETEABLE_LPAREN && *rparen == DELETEABLE_RPAREN ) {
        *lparen = '(';
        *rparen = ')';
        --SET_PUBLIC(line_edit,parens_deleted);
    }
}
void
restore_all_paren(void)
{
    char *buf = GET_PUBLIC(io,line_start);
    for (       ; *buf; ++buf) {
        if (*buf == DELETEABLE_LPAREN) {
            *buf = '(';
        } else if (*buf == DELETEABLE_RPAREN) {
            *buf = ')';
        }
    };
}

void
cut_text(char const *start, char const *end)
{
    char *s = (char *)start;
    char *e = (char *)end;
    SET_PUBLIC(line_edit,ops_cut) = true;
    DELETE_CHARS(s,e);
    /* Never delete the terminal newline in directive*/
    if (!*e) {
        e[-1] = '\n';
    }
}

void
truncate_line(size_t off)
{
    assert(off < GET_PUBLIC(io,line_len));
    LINE_START[off] = '\0';
    SET_PUBLIC(io,line_len) = off;
}


NO_PRIVATE_STATE(line_edit);
IMPLEMENT(line_edit,ZERO_INITABLE);
/* EOF*/