419 lines
11 KiB
C
419 lines
11 KiB
C
/* multi.c -- Multitable stuff for makeinfo.
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$Id: multi.c,v 1.7 1996/10/01 21:42:20 karl Exp $
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Copyright (C) 1996 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include <stdio.h>
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#include "makeinfo.h"
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#define MAXCOLS 100 /* remove this limit later @@ */
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/*
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* Output environments. This is a hack grafted onto existing
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* structure. The "output environment" used to consist of the
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* global variables `output_paragraph', `fill_column', etc.
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* Routines like add_char would manipulate these variables.
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*
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* Now, when formatting a multitable, we maintain separate environments
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* for each column. That way we can build up the columns separately
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* and write them all out at once. The "current" output environment"
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* is still kept in those global variables, so that the old output
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* routines don't have to change. But we provide routines to save
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* and restore these variables in an "environment table". The
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* `select_output_environment' function switches from one output
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* environment to another.
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*
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* Environment #0 (i.e. element #0 of the table) is the regular
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* environment that is used when we're not formatting a multitable.
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*
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* Environment #N (where N = 1,2,3,...) is the env. for column #N of
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* the table, when a multitable is active.
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*/
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/* contents of an output environment */
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/* some more vars may end up being needed here later @@ */
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struct env
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{
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unsigned char *output_paragraph;
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int output_paragraph_offset;
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int output_column;
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int paragraph_is_open;
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int current_indent;
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int fill_column;
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} envs[MAXCOLS]; /* the environment table */
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/* index in environment table of currently selected environment */
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static int current_env_no;
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/* column number of last column in current multitable */
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static int last_column;
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/* flags indicating whether horizontal and vertical separators need
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to be drawn, separating rows and columns in the current multitable. */
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static int hsep, vsep;
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void
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do_multitable ()
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{
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int ncolumns;
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/*
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* multitable strategy:
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* for each item {
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* for each column in an item {
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* initialize a new paragraph
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* do ordinary formatting into the new paragraph
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* save the paragraph away
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* repeat if there are more paragraphs in the column
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* }
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* dump out the saved paragraphs and free the storage
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* }
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*/
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if (multitable_active)
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{
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line_error ("Multitables cannot be nested");
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return;
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}
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/* scan the current item function to get the field widths
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and number of columns, and set up the output environment list
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accordingly. */
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ncolumns = setup_multitable_parameters ();
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if (hsep)
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draw_horizontal_separator ();
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/* The next @item command will direct stdout into the first column
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and start processing. @tab will then switch to the next column,
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and @item will flush out the saved output and return to the first
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column. Environment #1 is the first column. (Environment #0 is
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the normal output) */
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++multitable_active;
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}
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/* Read the parameters for a multitable from the current command
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line, save the parameters away, and return the
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number of columns. */
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int
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setup_multitable_parameters ()
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{
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char *params = insertion_stack->item_function;
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int nchars;
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float columnfrac;
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char command[200];
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int i = 1;
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/* We implement @hsep and @vsep even though TeX doesn't.
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We don't get mixing of @columnfractions and templates right,
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but TeX doesn't either. */
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hsep = vsep = 0;
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while (*params) {
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while (whitespace (*params))
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params++;
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if (*params == '@') {
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sscanf (params, "%s%n", command, &nchars);
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params += nchars;
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if (strcmp (command, "@hsep") == 0)
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hsep++;
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else if (strcmp (command, "@vsep") == 0)
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vsep++;
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else if (strcmp (command, "@columnfractions") == 0) {
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/* Clobber old environments and create new ones,
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starting at #1. Environment #0 is the normal standard output,
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so we don't mess with it. */
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for ( ; i <= MAXCOLS; i++) {
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if (sscanf (params, "%f%n", &columnfrac, &nchars) < 1)
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goto done;
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params += nchars;
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setup_output_environment (i, (int) (columnfrac * fill_column + .5));
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}
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}
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} else if (*params == '{') {
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char *start = params;
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while ((*params != '}' || params[-1] == '@') && *params) {
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params++;
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}
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/* This gives us two spaces between columns. Seems reasonable.
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Really should expand the text, though, so a template of
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`@code{foo}' has a width of three, not ten. Also have to match
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braces, then. */
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setup_output_environment (i++, params++ - start);
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} else {
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warning ("ignoring stray text `%s' after @multitable", params);
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break;
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}
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}
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done:
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flush_output ();
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inhibit_output_flushing ();
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last_column = i - 1;
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return last_column;
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}
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/* Initialize environment number ENV_NO, of width WIDTH.
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The idea is that we're going to use one environment for each column of
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a multitable, so we can build them up separately and print them
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all out at the end. */
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int
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setup_output_environment (env_no, width)
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int env_no;
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int width;
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{
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int old_env = select_output_environment (env_no);
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/* clobber old environment and set width of new one */
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init_paragraph ();
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/* make our change */
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fill_column = width;
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/* Save new environment and restore previous one. */
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select_output_environment (old_env);
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return env_no;
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}
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/* Direct current output to environment number N. Used when
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switching work from one column of a multitable to the next.
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Returns previous environment number. */
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int
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select_output_environment (n)
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int n;
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{
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struct env *e = &envs[current_env_no];
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int old_env_no = current_env_no;
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/* stash current env info from global vars into the old environment */
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e->output_paragraph = output_paragraph;
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e->output_paragraph_offset = output_paragraph_offset;
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e->output_column = output_column;
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e->paragraph_is_open = paragraph_is_open;
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e->current_indent = current_indent;
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e->fill_column = fill_column;
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/* now copy new environment into global vars */
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current_env_no = n;
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e = &envs[current_env_no];
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output_paragraph = e->output_paragraph;
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output_paragraph_offset = e->output_paragraph_offset;
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output_column = e->output_column;
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paragraph_is_open = e->paragraph_is_open;
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current_indent = e->current_indent;
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fill_column = e->fill_column;
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return old_env_no;
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}
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/* advance to the next environment number */
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int
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nselect_next_environment ()
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{
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if (current_env_no >= last_column) {
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line_error ("Too many columns in multitable item (max %d)", last_column);
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return 1;
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}
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select_output_environment (current_env_no + 1);
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}
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static void output_multitable_row ();
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/* start a new item (row) of a multitable */
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multitable_item ()
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{
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if (!multitable_active) {
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/* impossible, I think. */
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error ("multitable item not in active multitable");
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exit (1);
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}
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if (current_env_no > 0) {
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output_multitable_row ();
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}
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/* start at column 1 */
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select_output_environment (1);
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if (!output_paragraph) {
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line_error ("Cannot select column #%d in multitable", current_env_no);
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exit (FATAL);
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}
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init_column ();
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return 0;
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}
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/* do anything needed at the beginning of processing a
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multitable column. */
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init_column ()
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{
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/* don't indent 1st paragraph in the item */
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cm_noindent ();
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/* throw away possible whitespace after @item or @tab command */
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skip_whitespace ();
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}
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/* Output a row. Have to keep `output_position' up-to-date for each
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character we output, or the tags table will be off, leading to
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chopped-off output files and undefined nodes (because they're in the
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wrong file, etc.). Perhaps it would be better to accumulate this
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value somewhere and add it once at the end of the table, or return it
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as the value, but this seems simplest. */
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static void
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out_char (ch)
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int ch;
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{
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extern int output_position;
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putc (ch, output_stream);
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output_position++;
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}
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static void
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output_multitable_row ()
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{
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int i, j, remaining;
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/* offset in the output paragraph of the next char needing
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to be output for that column. */
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int offset[MAXCOLS];
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for (i = 0; i <= last_column; i++)
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offset[i] = 0;
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/* select the current environment, to make sure the env variables
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get updated */
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select_output_environment (current_env_no);
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#define CHAR_ADDR(n) (offset[i] + (n))
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#define CHAR_AT(n) (envs[i].output_paragraph[CHAR_ADDR(n)])
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/* remove trailing whitespace from each column */
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for (i = 1; i <= last_column; i++) {
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while (cr_or_whitespace (CHAR_AT (envs[i].output_paragraph_offset - 1))) {
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envs[i].output_paragraph_offset--;
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}
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}
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/* read the current line from each column, outputting them all
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pasted together. Do this til all lines are output from all
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columns. */
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for (;;) {
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remaining = 0;
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/* first, see if there is any work to do */
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for (i = 1; i <= last_column; i++) {
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if (CHAR_ADDR (0) < envs[i].output_paragraph_offset) {
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remaining = 1;
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break;
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}
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}
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if (!remaining)
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break;
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if (vsep)
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out_char ('|');
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for (i = 1; i <= last_column; i++) {
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for (j = 0; CHAR_ADDR (j) < envs[i].output_paragraph_offset; j++) {
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if (CHAR_AT (j) == '\n')
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break;
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out_char (CHAR_AT (j));
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}
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offset[i] += j + 1; /* skip last text plus skip the newline */
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for (; j <= envs[i].fill_column; j++)
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out_char (' ');
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if (vsep)
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out_char ('|'); /* draw column separator */
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}
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out_char ('\n'); /* end of line */
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}
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if (hsep)
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draw_horizontal_separator ();
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/* Now dispose of the buffered output. */
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for (i = 1; i <= last_column; i++) {
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select_output_environment (i);
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init_paragraph ();
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}
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}
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#undef CHAR_AT
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#undef CHAR_ADDR
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int
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draw_horizontal_separator ()
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{
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int i, j;
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if (vsep)
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out_char ('+');
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for (i = 1; i <= last_column; i++) {
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for (j = 0; j <= envs[i].fill_column; j++)
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out_char ('-');
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if (vsep)
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out_char ('+');
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}
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out_char ('\n');
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}
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/* select a new column in current row of multitable */
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void
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cm_tab ()
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{
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if (!multitable_active)
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error ("ignoring @tab outside of multitable");
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nselect_next_environment ();
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init_column ();
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}
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/* close a multitable, flushing its output and resetting
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whatever needs resetting */
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void
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end_multitable ()
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{
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int i;
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output_multitable_row ();
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/* Multitables cannot be nested. Otherwise, we'd have to save the
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previous output environment number on a stack somewhere, and then
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restore to that environment. */
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select_output_environment (0);
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close_paragraph ();
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insert ('\n'); /* we swallow newlines, so insert one of our own */
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multitable_active = 0;
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uninhibit_output_flushing ();
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#if 0
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printf ("** Multicolumn output from last row:\n");
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for (i = 1; i <= last_column; i++) {
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select_output_environment (i);
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printf ("* column #%d: output = %s\n", i, output_paragraph);
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}
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#endif
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}
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