The R Project SVN R

/*
 *  R : A Computer Langage for Statistical Data Analysis
 *  Copyright (C) 1995, 1996  Robert Gentleman and Ross Ihaka
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "Defn.h"
#include "Print.h"

/*
 * ed, vi etc have 3 parameters. the data, a file and an editor
 * 
 * if file is specified then the given file is used (and not removed on exit) if
 * file is not specified then a temporary file is used; since only one
 * temporary file is used for an entire session previous editing is lost
 * 
 * if data is specified then it is passed out to be edited; if data is not
 * specified then either file (if specified) or the temporary file is used
 * (thus errors can be re-editied by calling edit a second time with no
 * arguments).
 * 
 * if the editor is specified then the specified editor is invoked if possible
 * and an error message reported otherwise
 */

void InitEd()
{
}

void MacTextEdit(char *inbuf, int insize, char **outbuf, int *outsize, int *status)
{
    int i;
    char *p;

    p = *outbuf = malloc(insize);
    for(i=0 ; i<insize ; i++) {
        p[i] = inbuf[i];
    }
    *outsize = insize;
}

SEXP do_edit(SEXP call, SEXP op, SEXP args, SEXP rho)
{
    int i, j, l, protected, insize, outsize, status;
    SEXP x, s, envir;
    char *inbuf, *outbuf, *p, *q;
    char *vmaxsave;

    checkArity(op, args);
    vmaxsave = vmaxget();

    x = CAR(args);
    if (TYPEOF(x) == CLOSXP) {
        PROTECT(envir = CLOENV(x));
        protected = 1;
    }
    else protected = 0;

    if (x != R_NilValue) {
        x = deparse1(x, 0);
        insize = 0;
        for (i=0; i<LENGTH(x); i++)
            insize += strlen(CHAR(STRING(x)[i]))+1;
        p = inbuf = malloc(insize);
        for (i=0; i<LENGTH(x); i++) {
            q = CHAR(STRING(x)[i]);
            while(*q) *p++ = *q++;
            *p++ = '\r';
        }

        MacTextEdit(inbuf, insize, &outbuf, &outsize, &status);

            /* Count the number of strings */
            /* Note that we take \r as a SEPARATOR */

        p = q = outbuf;
        insize = 0;
        for(i=0 ; i<outsize ; i++)
            if(p[i] == '\r') insize++;
        PROTECT(x = allocVector(STRSXP, insize));
        protected++;

            /* put the strings in place */

        insize = 0;
        for(i=0 ; i<outsize ; i++) {
            if(*p == '\r') {
                l = p - q;
                s = allocString(l);
                for(j=0 ; j<l ; j++)
                    CHAR(s)[j] = q[j];
                CHAR(s)[l] = '\0';
                STRING(x)[insize++] = s;
                q = p+1;
            }
            *p++;
        }

            /* cleanup malloc-ed space */

        free(inbuf);
        free(outbuf);

            /* parse the edited text */
    }
    UNPROTECT(protected);
    return x;
}