631 lines
17 KiB
C
631 lines
17 KiB
C
/* $NetBSD: lexi.c,v 1.13 2009/04/12 11:09:49 lukem Exp $ */
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/*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1976 Board of Trustees of the University of Illinois.
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* Copyright (c) 1985 Sun Microsystems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)lexi.c 8.1 (Berkeley) 6/6/93";
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#else
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__RCSID("$NetBSD: lexi.c,v 1.13 2009/04/12 11:09:49 lukem Exp $");
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#endif
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#endif /* not lint */
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/*
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* Here we have the token scanner for indent. It scans off one token and puts
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* it in the global variable "token". It returns a code, indicating the type
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* of token scanned.
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*/
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include "indent_globs.h"
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#include "indent_codes.h"
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#define alphanum 1
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#define opchar 3
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struct templ {
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const char *rwd;
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int rwcode;
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};
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struct templ specials[1000] =
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{
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{"switch", 1},
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{"case", 2},
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{"break", 0},
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{"struct", 3},
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{"union", 3},
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{"enum", 3},
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{"default", 2},
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{"int", 4},
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{"char", 4},
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{"float", 4},
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{"double", 4},
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{"long", 4},
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{"short", 4},
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{"typdef", 4},
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{"unsigned", 4},
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{"register", 4},
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{"static", 4},
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{"global", 4},
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{"extern", 4},
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{"void", 4},
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{"goto", 0},
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{"return", 0},
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{"if", 5},
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{"while", 5},
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{"for", 5},
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{"else", 6},
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{"do", 6},
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{"sizeof", 7},
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{0, 0}
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};
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char chartype[128] =
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{ /* this is used to facilitate the decision of
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* what type (alphanumeric, operator) each
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* character is */
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 3, 0, 0, 1, 3, 3, 0,
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0, 0, 3, 3, 0, 3, 0, 3,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 0, 0, 3, 3, 3, 3,
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0, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 0, 0, 0, 3, 1,
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0, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 0, 3, 0, 3, 0
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};
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int
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lexi(void)
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{
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int unary_delim; /* this is set to 1 if the current token
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*
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* forces a following operator to be unary */
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static int last_code; /* the last token type returned */
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static int l_struct; /* set to 1 if the last token was 'struct' */
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int code; /* internal code to be returned */
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char qchar; /* the delimiter character for a string */
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e_token = s_token; /* point to start of place to save token */
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unary_delim = false;
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ps.col_1 = ps.last_nl; /* tell world that this token started in
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* column 1 iff the last thing scanned was nl */
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ps.last_nl = false;
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while (*buf_ptr == ' ' || *buf_ptr == '\t') { /* get rid of blanks */
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ps.col_1 = false; /* leading blanks imply token is not
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* in column 1 */
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if (++buf_ptr >= buf_end)
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fill_buffer();
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}
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/* Scan an alphanumeric token */
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if (chartype[(int) *buf_ptr] == alphanum ||
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(buf_ptr[0] == '.' && isdigit((unsigned char)buf_ptr[1]))) {
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/*
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* we have a character or number
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*/
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const char *j; /* used for searching thru list of
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* reserved words */
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struct templ *p;
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if (isdigit((unsigned char)*buf_ptr) ||
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(buf_ptr[0] == '.' && isdigit((unsigned char)buf_ptr[1]))) {
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int seendot = 0, seenexp = 0, seensfx = 0;
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if (*buf_ptr == '0' &&
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(buf_ptr[1] == 'x' || buf_ptr[1] == 'X')) {
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*e_token++ = *buf_ptr++;
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*e_token++ = *buf_ptr++;
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while (isxdigit((unsigned char)*buf_ptr)) {
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CHECK_SIZE_TOKEN;
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*e_token++ = *buf_ptr++;
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}
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} else {
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while (1) {
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if (*buf_ptr == '.') {
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if (seendot)
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break;
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else
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seendot++;
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}
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CHECK_SIZE_TOKEN;
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*e_token++ = *buf_ptr++;
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if (!isdigit((unsigned char)*buf_ptr)
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&& *buf_ptr != '.') {
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if ((*buf_ptr != 'E'
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&& *buf_ptr != 'e') || seenexp)
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break;
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else {
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seenexp++;
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seendot++;
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CHECK_SIZE_TOKEN;
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*e_token++ = *buf_ptr++;
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if (*buf_ptr == '+' || *buf_ptr == '-')
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*e_token++ = *buf_ptr++;
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}
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}
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}
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}
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if (*buf_ptr == 'F' || *buf_ptr == 'f') {
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/* float constant */
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*e_token++ = *buf_ptr++;
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} else {
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/* integer constant */
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while (1) {
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if (!(seensfx & 1) &&
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(*buf_ptr == 'U' ||
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*buf_ptr == 'u')) {
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CHECK_SIZE_TOKEN;
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*e_token++ = *buf_ptr++;
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seensfx |= 1;
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continue;
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}
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if (!(seensfx & 2) &&
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(*buf_ptr == 'L' ||
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*buf_ptr == 'l')) {
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CHECK_SIZE_TOKEN;
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if (buf_ptr[1] == buf_ptr[0])
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*e_token++ = *buf_ptr++;
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*e_token++ = *buf_ptr++;
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seensfx |= 2;
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continue;
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}
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break;
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}
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}
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} else
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while (chartype[(int) *buf_ptr] == alphanum) { /* copy it over */
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CHECK_SIZE_TOKEN;
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*e_token++ = *buf_ptr++;
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if (buf_ptr >= buf_end)
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fill_buffer();
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}
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*e_token++ = '\0';
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while (*buf_ptr == ' ' || *buf_ptr == '\t') { /* get rid of blanks */
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if (++buf_ptr >= buf_end)
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fill_buffer();
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}
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ps.its_a_keyword = false;
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ps.sizeof_keyword = false;
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if (l_struct) { /* if last token was 'struct', then this token
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* should be treated as a declaration */
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l_struct = false;
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last_code = ident;
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ps.last_u_d = true;
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return (decl);
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}
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ps.last_u_d = false; /* Operator after indentifier is
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* binary */
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last_code = ident; /* Remember that this is the code we
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* will return */
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/*
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* This loop will check if the token is a keyword.
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*/
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for (p = specials; (j = p->rwd) != 0; p++) {
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char *pt = s_token; /* point at scanned token */
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if (*j++ != *pt++ || *j++ != *pt++)
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continue; /* This test depends on the
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* fact that identifiers are
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* always at least 1 character
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* long (ie. the first two
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* bytes of the identifier are
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* always meaningful) */
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if (pt[-1] == 0)
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break; /* If its a one-character identifier */
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while (*pt++ == *j)
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if (*j++ == 0)
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goto found_keyword; /* I wish that C had a
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* multi-level break... */
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}
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if (p->rwd) { /* we have a keyword */
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found_keyword:
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ps.its_a_keyword = true;
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ps.last_u_d = true;
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switch (p->rwcode) {
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case 1:/* it is a switch */
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return (swstmt);
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case 2:/* a case or default */
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return (casestmt);
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case 3:/* a "struct" */
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if (ps.p_l_follow)
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break; /* inside parens: cast */
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l_struct = true;
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|
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/*
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* Next time around, we will want to know that we have had a
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* 'struct'
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*/
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case 4:/* one of the declaration keywords */
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if (ps.p_l_follow) {
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ps.cast_mask |= 1 << ps.p_l_follow;
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break; /* inside parens: cast */
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}
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last_code = decl;
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return (decl);
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|
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case 5:/* if, while, for */
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return (sp_paren);
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case 6:/* do, else */
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return (sp_nparen);
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case 7:
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ps.sizeof_keyword = true;
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default: /* all others are treated like any
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* other identifier */
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return (ident);
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} /* end of switch */
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} /* end of if (found_it) */
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if (*buf_ptr == '(' && ps.tos <= 1 && ps.ind_level == 0) {
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char *tp = buf_ptr;
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while (tp < buf_end)
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if (*tp++ == ')' && (*tp == ';' || *tp == ','))
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goto not_proc;
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strncpy(ps.procname, token, sizeof ps.procname - 1);
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ps.in_parameter_declaration = 1;
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rparen_count = 1;
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not_proc: ;
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}
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/*
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* The following hack attempts to guess whether or not the current
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* token is in fact a declaration keyword -- one that has been
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* typedefd
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*/
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if (((*buf_ptr == '*' && buf_ptr[1] != '=') ||
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isalpha((unsigned char)*buf_ptr) || *buf_ptr == '_')
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&& !ps.p_l_follow
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&& !ps.block_init
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&& (ps.last_token == rparen || ps.last_token == semicolon ||
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ps.last_token == decl ||
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ps.last_token == lbrace || ps.last_token == rbrace)) {
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ps.its_a_keyword = true;
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ps.last_u_d = true;
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last_code = decl;
|
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return decl;
|
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}
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if (last_code == decl) /* if this is a declared variable,
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* then following sign is unary */
|
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ps.last_u_d = true; /* will make "int a -1" work */
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last_code = ident;
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return (ident); /* the ident is not in the list */
|
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} /* end of procesing for alpanum character */
|
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/* Scan a non-alphanumeric token */
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*e_token++ = *buf_ptr; /* if it is only a one-character token, it is
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* moved here */
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*e_token = '\0';
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if (++buf_ptr >= buf_end)
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fill_buffer();
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|
|
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switch (*token) {
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case '\n':
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unary_delim = ps.last_u_d;
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ps.last_nl = true; /* remember that we just had a newline */
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code = (had_eof ? 0 : newline);
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|
|
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/*
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* if data has been exausted, the newline is a dummy, and we should
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* return code to stop
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*/
|
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break;
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|
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case '\'': /* start of quoted character */
|
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case '"': /* start of string */
|
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qchar = *token;
|
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if (troff) {
|
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e_token[-1] = '`';
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if (qchar == '"')
|
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*e_token++ = '`';
|
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e_token = chfont(&bodyf, &stringf, e_token);
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}
|
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do { /* copy the string */
|
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while (1) { /* move one character or
|
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* [/<char>]<char> */
|
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if (*buf_ptr == '\n') {
|
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printf("%d: Unterminated literal\n", line_no);
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goto stop_lit;
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}
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CHECK_SIZE_TOKEN; /* Only have to do this
|
|
* once in this loop,
|
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* since CHECK_SIZE
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* guarantees that there
|
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* are at least 5
|
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* entries left */
|
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*e_token = *buf_ptr++;
|
|
if (buf_ptr >= buf_end)
|
|
fill_buffer();
|
|
if (*e_token == BACKSLASH) { /* if escape, copy extra
|
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* char */
|
|
if (*buf_ptr == '\n') /* check for escaped
|
|
* newline */
|
|
++line_no;
|
|
if (troff) {
|
|
*++e_token = BACKSLASH;
|
|
if (*buf_ptr == BACKSLASH)
|
|
*++e_token = BACKSLASH;
|
|
}
|
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*++e_token = *buf_ptr++;
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++e_token; /* we must increment
|
|
* this again because we
|
|
* copied two chars */
|
|
if (buf_ptr >= buf_end)
|
|
fill_buffer();
|
|
} else
|
|
break; /* we copied one character */
|
|
} /* end of while (1) */
|
|
} while (*e_token++ != qchar);
|
|
if (troff) {
|
|
e_token = chfont(&stringf, &bodyf, e_token - 1);
|
|
if (qchar == '"')
|
|
*e_token++ = '\'';
|
|
}
|
|
stop_lit:
|
|
code = ident;
|
|
break;
|
|
|
|
case ('('):
|
|
case ('['):
|
|
unary_delim = true;
|
|
code = lparen;
|
|
break;
|
|
|
|
case (')'):
|
|
case (']'):
|
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code = rparen;
|
|
break;
|
|
|
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case '#':
|
|
unary_delim = ps.last_u_d;
|
|
code = preesc;
|
|
break;
|
|
|
|
case '?':
|
|
unary_delim = true;
|
|
code = question;
|
|
break;
|
|
|
|
case (':'):
|
|
code = colon;
|
|
unary_delim = true;
|
|
break;
|
|
|
|
case (';'):
|
|
unary_delim = true;
|
|
code = semicolon;
|
|
break;
|
|
|
|
case ('{'):
|
|
unary_delim = true;
|
|
|
|
/*
|
|
* if (ps.in_or_st) ps.block_init = 1;
|
|
*/
|
|
/* ? code = ps.block_init ? lparen : lbrace; */
|
|
code = lbrace;
|
|
break;
|
|
|
|
case ('}'):
|
|
unary_delim = true;
|
|
/* ? code = ps.block_init ? rparen : rbrace; */
|
|
code = rbrace;
|
|
break;
|
|
|
|
case 014: /* a form feed */
|
|
unary_delim = ps.last_u_d;
|
|
ps.last_nl = true; /* remember this so we can set
|
|
* 'ps.col_1' right */
|
|
code = form_feed;
|
|
break;
|
|
|
|
case (','):
|
|
unary_delim = true;
|
|
code = comma;
|
|
break;
|
|
|
|
case '.':
|
|
unary_delim = false;
|
|
code = period;
|
|
break;
|
|
|
|
case '-':
|
|
case '+': /* check for -, +, --, ++ */
|
|
code = (ps.last_u_d ? unary_op : binary_op);
|
|
unary_delim = true;
|
|
|
|
if (*buf_ptr == token[0]) {
|
|
/* check for doubled character */
|
|
*e_token++ = *buf_ptr++;
|
|
/* buffer overflow will be checked at end of loop */
|
|
if (last_code == ident || last_code == rparen) {
|
|
code = (ps.last_u_d ? unary_op : postop);
|
|
/* check for following ++ or -- */
|
|
unary_delim = false;
|
|
}
|
|
} else
|
|
if (*buf_ptr == '=')
|
|
/* check for operator += */
|
|
*e_token++ = *buf_ptr++;
|
|
else
|
|
if (*buf_ptr == '>') {
|
|
/* check for operator -> */
|
|
*e_token++ = *buf_ptr++;
|
|
if (!pointer_as_binop) {
|
|
unary_delim = false;
|
|
code = unary_op;
|
|
ps.want_blank = false;
|
|
}
|
|
}
|
|
break; /* buffer overflow will be checked at end of
|
|
* switch */
|
|
|
|
case '=':
|
|
if (ps.in_or_st)
|
|
ps.block_init = 1;
|
|
#ifdef undef
|
|
if (chartype[*buf_ptr] == opchar) { /* we have two char
|
|
* assignment */
|
|
e_token[-1] = *buf_ptr++;
|
|
if ((e_token[-1] == '<' || e_token[-1] == '>') && e_token[-1] == *buf_ptr)
|
|
*e_token++ = *buf_ptr++;
|
|
*e_token++ = '='; /* Flip =+ to += */
|
|
*e_token = 0;
|
|
}
|
|
#else
|
|
if (*buf_ptr == '=') { /* == */
|
|
*e_token++ = '='; /* Flip =+ to += */
|
|
buf_ptr++;
|
|
*e_token = 0;
|
|
}
|
|
#endif
|
|
code = binary_op;
|
|
unary_delim = true;
|
|
break;
|
|
/* can drop thru!!! */
|
|
|
|
case '>':
|
|
case '<':
|
|
case '!': /* ops like <, <<, <=, !=, etc */
|
|
if (*buf_ptr == '>' || *buf_ptr == '<' || *buf_ptr == '=') {
|
|
*e_token++ = *buf_ptr;
|
|
if (++buf_ptr >= buf_end)
|
|
fill_buffer();
|
|
}
|
|
if (*buf_ptr == '=')
|
|
*e_token++ = *buf_ptr++;
|
|
code = (ps.last_u_d ? unary_op : binary_op);
|
|
unary_delim = true;
|
|
break;
|
|
|
|
default:
|
|
if (token[0] == '/' && *buf_ptr == '*') {
|
|
/* it is start of comment */
|
|
*e_token++ = '*';
|
|
|
|
if (++buf_ptr >= buf_end)
|
|
fill_buffer();
|
|
|
|
code = comment;
|
|
unary_delim = ps.last_u_d;
|
|
break;
|
|
}
|
|
while (*(e_token - 1) == *buf_ptr || *buf_ptr == '=') {
|
|
/*
|
|
* handle ||, &&, etc, and also things as in int *****i
|
|
*/
|
|
*e_token++ = *buf_ptr;
|
|
if (++buf_ptr >= buf_end)
|
|
fill_buffer();
|
|
}
|
|
code = (ps.last_u_d ? unary_op : binary_op);
|
|
unary_delim = true;
|
|
|
|
|
|
} /* end of switch */
|
|
if (code != newline) {
|
|
l_struct = false;
|
|
last_code = code;
|
|
}
|
|
if (buf_ptr >= buf_end) /* check for input buffer empty */
|
|
fill_buffer();
|
|
ps.last_u_d = unary_delim;
|
|
*e_token = '\0'; /* null terminate the token */
|
|
return (code);
|
|
}
|
|
/*
|
|
* Add the given keyword to the keyword table, using val as the keyword type
|
|
*/
|
|
void
|
|
addkey(char *key, int val)
|
|
{
|
|
struct templ *p = specials;
|
|
while (p->rwd)
|
|
if (p->rwd[0] == key[0] && strcmp(p->rwd, key) == 0)
|
|
return;
|
|
else
|
|
p++;
|
|
if (p >= specials + sizeof specials / sizeof specials[0])
|
|
return; /* For now, table overflows are silently
|
|
* ignored */
|
|
p->rwd = key;
|
|
p->rwcode = val;
|
|
p[1].rwd = 0;
|
|
p[1].rwcode = 0;
|
|
}
|