300 lines
7.7 KiB
C
300 lines
7.7 KiB
C
/*
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* Copyright (c) 1992, The Regents of the University of California.
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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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#ifndef lint
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static char sccsid[] = "@(#)for.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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/*-
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* for.c --
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* Functions to handle loops in a makefile.
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*
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* Interface:
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* For_Eval Evaluate the loop in the passed line.
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* For_Run Run accumulated loop
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*
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*/
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#include <ctype.h>
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#include "make.h"
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#include "hash.h"
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#include "dir.h"
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#include "buf.h"
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/*
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* For statements are of the form:
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*
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* .for <variable> in <varlist>
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* ...
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* .endfor
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*
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* The trick is to look for the matching end inside for for loop
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* To do that, we count the current nesting level of the for loops.
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* and the .endfor statements, accumulating all the statements between
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* the initial .for loop and the matching .endfor;
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* then we evaluate the for loop for each variable in the varlist.
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*/
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static int forLevel = 0; /* Nesting level */
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static char *forVar; /* Iteration variable */
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static Buffer forBuf; /* Commands in loop */
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static Lst forLst; /* List of items */
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/*
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* State of a for loop.
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*/
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typedef struct _For {
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Buffer buf; /* Unexpanded buffer */
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char* var; /* Index name */
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Lst lst; /* List of variables */
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} For;
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static int ForExec __P((ClientData, ClientData));
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/*-
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*-----------------------------------------------------------------------
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* For_Eval --
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* Evaluate the for loop in the passed line. The line
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* looks like this:
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* .for <variable> in <varlist>
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*
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* Results:
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* TRUE: We found a for loop, or we are inside a for loop
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* FALSE: We did not find a for loop, or we found the end of the for
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* for loop.
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*
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* Side Effects:
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* None.
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*
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*-----------------------------------------------------------------------
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*/
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int
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For_Eval (line)
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char *line; /* Line to parse */
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{
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char *ptr = line, *sub, *wrd;
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int level; /* Level at which to report errors. */
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level = PARSE_FATAL;
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if (forLevel == 0) {
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Buffer buf;
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int varlen;
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for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++)
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continue;
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/*
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* If we are not in a for loop quickly determine if the statement is
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* a for.
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*/
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if (ptr[0] != 'f' || ptr[1] != 'o' || ptr[2] != 'r' ||
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!isspace((unsigned char) ptr[3]))
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return FALSE;
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ptr += 3;
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/*
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* we found a for loop, and now we are going to parse it.
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*/
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while (*ptr && isspace((unsigned char) *ptr))
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ptr++;
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/*
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* Grab the variable
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*/
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buf = Buf_Init(0);
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for (wrd = ptr; *ptr && !isspace((unsigned char) *ptr); ptr++)
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continue;
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Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd);
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forVar = (char *) Buf_GetAll(buf, &varlen);
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if (varlen == 0) {
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Parse_Error (level, "missing variable in for");
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return 0;
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}
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Buf_Destroy(buf, FALSE);
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while (*ptr && isspace((unsigned char) *ptr))
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ptr++;
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/*
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* Grab the `in'
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*/
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if (ptr[0] != 'i' || ptr[1] != 'n' ||
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!isspace((unsigned char) ptr[2])) {
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Parse_Error (level, "missing `in' in for");
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printf("%s\n", ptr);
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return 0;
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}
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ptr += 3;
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while (*ptr && isspace((unsigned char) *ptr))
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ptr++;
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/*
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* Make a list with the remaining words
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*/
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forLst = Lst_Init(FALSE);
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buf = Buf_Init(0);
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sub = Var_Subst(NULL, ptr, VAR_GLOBAL, FALSE);
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#define ADDWORD() \
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Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd), \
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Buf_AddByte(buf, (Byte) '\0'), \
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Lst_AtFront(forLst, (ClientData) Buf_GetAll(buf, &varlen)), \
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Buf_Destroy(buf, FALSE)
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for (ptr = sub; *ptr && isspace((unsigned char) *ptr); ptr++)
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continue;
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for (wrd = ptr; *ptr; ptr++)
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if (isspace((unsigned char) *ptr)) {
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ADDWORD();
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buf = Buf_Init(0);
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while (*ptr && isspace((unsigned char) *ptr))
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ptr++;
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wrd = ptr--;
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}
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if (DEBUG(FOR))
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(void) fprintf(stderr, "For: Iterator %s List %s\n", forVar, sub);
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if (ptr - wrd > 0)
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ADDWORD();
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else
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Buf_Destroy(buf, TRUE);
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free((Address) sub);
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forBuf = Buf_Init(0);
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forLevel++;
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return 1;
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}
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else if (*ptr == '.') {
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for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++)
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continue;
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if (strncmp(ptr, "endfor", 6) == 0 &&
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(isspace((unsigned char) ptr[6]) || !ptr[6])) {
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if (DEBUG(FOR))
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(void) fprintf(stderr, "For: end for %d\n", forLevel);
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if (--forLevel < 0) {
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Parse_Error (level, "for-less endfor");
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return 0;
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}
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}
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else if (strncmp(ptr, "for", 3) == 0 &&
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isspace((unsigned char) ptr[3])) {
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forLevel++;
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if (DEBUG(FOR))
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(void) fprintf(stderr, "For: new loop %d\n", forLevel);
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}
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}
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if (forLevel != 0) {
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Buf_AddBytes(forBuf, strlen(line), (Byte *) line);
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Buf_AddByte(forBuf, (Byte) '\n');
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return 1;
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}
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else {
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return 0;
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}
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}
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/*-
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*-----------------------------------------------------------------------
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* ForExec --
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* Expand the for loop for this index and push it in the Makefile
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*
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* Results:
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* None.
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*
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* Side Effects:
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* None.
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*
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*-----------------------------------------------------------------------
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*/
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static int
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ForExec(namep, argp)
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ClientData namep;
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ClientData argp;
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{
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char *name = (char *) namep;
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For *arg = (For *) argp;
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int len;
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Var_Set(arg->var, name, VAR_GLOBAL);
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if (DEBUG(FOR))
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(void) fprintf(stderr, "--- %s = %s\n", arg->var, name);
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Parse_FromString(Var_Subst(arg->var, (char *) Buf_GetAll(arg->buf, &len),
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VAR_GLOBAL, FALSE));
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Var_Delete(arg->var, VAR_GLOBAL);
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return 0;
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}
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/*-
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*-----------------------------------------------------------------------
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* For_Run --
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* Run the for loop, immitating the actions of an include file
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*
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* Results:
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* None.
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*
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* Side Effects:
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* None.
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*
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*-----------------------------------------------------------------------
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*/
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void
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For_Run()
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{
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For arg;
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if (forVar == NULL || forBuf == NULL || forLst == NULL)
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return;
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arg.var = forVar;
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arg.buf = forBuf;
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arg.lst = forLst;
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forVar = NULL;
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forBuf = NULL;
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forLst = NULL;
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Lst_ForEach(arg.lst, ForExec, (ClientData) &arg);
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free((Address)arg.var);
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Lst_Destroy(arg.lst, (void (*) __P((ClientData))) free);
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Buf_Destroy(arg.buf, TRUE);
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}
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