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Revision 1.151, Thu Apr 2 22:48:17 2015 UTC (8 years, 11 months ago) by schwarze
Branch: MAIN
Changes since 1.150: +34 -35 lines

Second step towards parser unification:
Replace struct mdoc_node and struct man_node by a unified struct roff_node.
To be able to use the tok member for both mdoc(7) and man(7) without
defining all the macros in roff.h, sacrifice a tiny bit of type safety
and make tok an int rather than an enum.
Almost mechanical, no functional change.
Written on the Eurostar from Bruxelles to London on the way to p2k15.

/*	$Id: man.c,v 1.151 2015/04/02 22:48:17 schwarze Exp $ */
/*
 * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2013, 2014, 2015 Ingo Schwarze <schwarze@openbsd.org>
 * Copyright (c) 2011 Joerg Sonnenberger <joerg@netbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include "config.h"

#include <sys/types.h>

#include <assert.h>
#include <ctype.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "mandoc_aux.h"
#include "mandoc.h"
#include "roff.h"
#include "man.h"
#include "libmandoc.h"
#include "libman.h"

const	char *const __man_macronames[MAN_MAX] = {
	"br",		"TH",		"SH",		"SS",
	"TP",		"LP",		"PP",		"P",
	"IP",		"HP",		"SM",		"SB",
	"BI",		"IB",		"BR",		"RB",
	"R",		"B",		"I",		"IR",
	"RI",		"sp",		"nf",
	"fi",		"RE",		"RS",		"DT",
	"UC",		"PD",		"AT",		"in",
	"ft",		"OP",		"EX",		"EE",
	"UR",		"UE",		"ll"
	};

const	char * const *man_macronames = __man_macronames;

static	void		 man_alloc1(struct man *);
static	void		 man_breakscope(struct man *, int);
static	void		 man_descope(struct man *, int, int);
static	void		 man_free1(struct man *);
static	struct roff_node *man_node_alloc(struct man *, int, int,
				enum roff_type, int);
static	void		 man_node_append(struct man *, struct roff_node *);
static	void		 man_node_free(struct roff_node *);
static	void		 man_node_unlink(struct man *, struct roff_node *);
static	int		 man_ptext(struct man *, int, char *, int);
static	int		 man_pmacro(struct man *, int, char *, int);


const struct roff_node *
man_node(const struct man *man)
{

	return(man->first);
}

const struct man_meta *
man_meta(const struct man *man)
{

	return(&man->meta);
}

void
man_reset(struct man *man)
{

	man_free1(man);
	man_alloc1(man);
}

void
man_free(struct man *man)
{

	man_free1(man);
	free(man);
}

struct man *
man_alloc(struct roff *roff, struct mparse *parse,
	const char *defos, int quick)
{
	struct man	*p;

	p = mandoc_calloc(1, sizeof(struct man));

	man_hash_init();
	p->parse = parse;
	p->defos = defos;
	p->quick = quick;
	p->roff = roff;

	man_alloc1(p);
	return(p);
}

void
man_endparse(struct man *man)
{

	man_macroend(man);
}

int
man_parseln(struct man *man, int ln, char *buf, int offs)
{

	if (man->last->type != ROFFT_EQN || ln > man->last->line)
		man->flags |= MAN_NEWLINE;

	return (roff_getcontrol(man->roff, buf, &offs) ?
	    man_pmacro(man, ln, buf, offs) :
	    man_ptext(man, ln, buf, offs));
}

static void
man_free1(struct man *man)
{

	if (man->first)
		man_node_delete(man, man->first);
	free(man->meta.title);
	free(man->meta.source);
	free(man->meta.date);
	free(man->meta.vol);
	free(man->meta.msec);
}

static void
man_alloc1(struct man *man)
{

	memset(&man->meta, 0, sizeof(struct man_meta));
	man->flags = 0;
	man->last = mandoc_calloc(1, sizeof(*man->last));
	man->first = man->last;
	man->last->type = ROFFT_ROOT;
	man->last->tok = MAN_MAX;
	man->next = MAN_NEXT_CHILD;
}


static void
man_node_append(struct man *man, struct roff_node *p)
{

	assert(man->last);
	assert(man->first);
	assert(p->type != ROFFT_ROOT);

	switch (man->next) {
	case MAN_NEXT_SIBLING:
		man->last->next = p;
		p->prev = man->last;
		p->parent = man->last->parent;
		break;
	case MAN_NEXT_CHILD:
		man->last->child = p;
		p->parent = man->last;
		break;
	default:
		abort();
		/* NOTREACHED */
	}

	assert(p->parent);
	p->parent->nchild++;

	switch (p->type) {
	case ROFFT_BLOCK:
		if (p->tok == MAN_SH || p->tok == MAN_SS)
			man->flags &= ~MAN_LITERAL;
		break;
	case ROFFT_HEAD:
		assert(p->parent->type == ROFFT_BLOCK);
		p->parent->head = p;
		break;
	case ROFFT_BODY:
		assert(p->parent->type == ROFFT_BLOCK);
		p->parent->body = p;
		break;
	default:
		break;
	}

	man->last = p;

	switch (p->type) {
	case ROFFT_TBL:
		/* FALLTHROUGH */
	case ROFFT_TEXT:
		man_valid_post(man);
		break;
	default:
		break;
	}
}

static struct roff_node *
man_node_alloc(struct man *man, int line, int pos,
		enum roff_type type, int tok)
{
	struct roff_node *p;

	p = mandoc_calloc(1, sizeof(*p));
	p->line = line;
	p->pos = pos;
	p->type = type;
	p->tok = tok;

	if (man->flags & MAN_NEWLINE)
		p->flags |= MAN_LINE;
	man->flags &= ~MAN_NEWLINE;
	return(p);
}

void
man_elem_alloc(struct man *man, int line, int pos, int tok)
{
	struct roff_node *p;

	p = man_node_alloc(man, line, pos, ROFFT_ELEM, tok);
	man_node_append(man, p);
	man->next = MAN_NEXT_CHILD;
}

void
man_head_alloc(struct man *man, int line, int pos, int tok)
{
	struct roff_node *p;

	p = man_node_alloc(man, line, pos, ROFFT_HEAD, tok);
	man_node_append(man, p);
	man->next = MAN_NEXT_CHILD;
}

void
man_body_alloc(struct man *man, int line, int pos, int tok)
{
	struct roff_node *p;

	p = man_node_alloc(man, line, pos, ROFFT_BODY, tok);
	man_node_append(man, p);
	man->next = MAN_NEXT_CHILD;
}

void
man_block_alloc(struct man *man, int line, int pos, int tok)
{
	struct roff_node *p;

	p = man_node_alloc(man, line, pos, ROFFT_BLOCK, tok);
	man_node_append(man, p);
	man->next = MAN_NEXT_CHILD;
}

void
man_word_alloc(struct man *man, int line, int pos, const char *word)
{
	struct roff_node *n;

	n = man_node_alloc(man, line, pos, ROFFT_TEXT, MAN_MAX);
	n->string = roff_strdup(man->roff, word);
	man_node_append(man, n);
	man->next = MAN_NEXT_SIBLING;
}

void
man_word_append(struct man *man, const char *word)
{
	struct roff_node *n;
	char		*addstr, *newstr;

	n = man->last;
	addstr = roff_strdup(man->roff, word);
	mandoc_asprintf(&newstr, "%s %s", n->string, addstr);
	free(addstr);
	free(n->string);
	n->string = newstr;
	man->next = MAN_NEXT_SIBLING;
}

/*
 * Free all of the resources held by a node.  This does NOT unlink a
 * node from its context; for that, see man_node_unlink().
 */
static void
man_node_free(struct roff_node *p)
{

	free(p->string);
	free(p);
}

void
man_node_delete(struct man *man, struct roff_node *p)
{

	while (p->child)
		man_node_delete(man, p->child);

	man_node_unlink(man, p);
	man_node_free(p);
}

void
man_addeqn(struct man *man, const struct eqn *ep)
{
	struct roff_node *n;

	n = man_node_alloc(man, ep->ln, ep->pos, ROFFT_EQN, MAN_MAX);
	n->eqn = ep;
	if (ep->ln > man->last->line)
		n->flags |= MAN_LINE;
	man_node_append(man, n);
	man->next = MAN_NEXT_SIBLING;
	man_descope(man, ep->ln, ep->pos);
}

void
man_addspan(struct man *man, const struct tbl_span *sp)
{
	struct roff_node *n;

	man_breakscope(man, MAN_MAX);
	n = man_node_alloc(man, sp->line, 0, ROFFT_TBL, MAN_MAX);
	n->span = sp;
	man_node_append(man, n);
	man->next = MAN_NEXT_SIBLING;
	man_descope(man, sp->line, 0);
}

static void
man_descope(struct man *man, int line, int offs)
{
	/*
	 * Co-ordinate what happens with having a next-line scope open:
	 * first close out the element scope (if applicable), then close
	 * out the block scope (also if applicable).
	 */

	if (man->flags & MAN_ELINE) {
		man->flags &= ~MAN_ELINE;
		man_unscope(man, man->last->parent);
	}
	if ( ! (man->flags & MAN_BLINE))
		return;
	man->flags &= ~MAN_BLINE;
	man_unscope(man, man->last->parent);
	man_body_alloc(man, line, offs, man->last->tok);
}

static int
man_ptext(struct man *man, int line, char *buf, int offs)
{
	int		 i;

	/* Literal free-form text whitespace is preserved. */

	if (man->flags & MAN_LITERAL) {
		man_word_alloc(man, line, offs, buf + offs);
		man_descope(man, line, offs);
		return(1);
	}

	for (i = offs; buf[i] == ' '; i++)
		/* Skip leading whitespace. */ ;

	/*
	 * Blank lines are ignored right after headings
	 * but add a single vertical space elsewhere.
	 */

	if (buf[i] == '\0') {
		/* Allocate a blank entry. */
		if (man->last->tok != MAN_SH &&
		    man->last->tok != MAN_SS) {
			man_elem_alloc(man, line, offs, MAN_sp);
			man->next = MAN_NEXT_SIBLING;
		}
		return(1);
	}

	/*
	 * Warn if the last un-escaped character is whitespace. Then
	 * strip away the remaining spaces (tabs stay!).
	 */

	i = (int)strlen(buf);
	assert(i);

	if (' ' == buf[i - 1] || '\t' == buf[i - 1]) {
		if (i > 1 && '\\' != buf[i - 2])
			mandoc_msg(MANDOCERR_SPACE_EOL, man->parse,
			    line, i - 1, NULL);

		for (--i; i && ' ' == buf[i]; i--)
			/* Spin back to non-space. */ ;

		/* Jump ahead of escaped whitespace. */
		i += '\\' == buf[i] ? 2 : 1;

		buf[i] = '\0';
	}
	man_word_alloc(man, line, offs, buf + offs);

	/*
	 * End-of-sentence check.  If the last character is an unescaped
	 * EOS character, then flag the node as being the end of a
	 * sentence.  The front-end will know how to interpret this.
	 */

	assert(i);
	if (mandoc_eos(buf, (size_t)i))
		man->last->flags |= MAN_EOS;

	man_descope(man, line, offs);
	return(1);
}

static int
man_pmacro(struct man *man, int ln, char *buf, int offs)
{
	struct roff_node *n;
	const char	*cp;
	int		 tok;
	int		 i, ppos;
	int		 bline;
	char		 mac[5];

	ppos = offs;

	/*
	 * Copy the first word into a nil-terminated buffer.
	 * Stop when a space, tab, escape, or eoln is encountered.
	 */

	i = 0;
	while (i < 4 && strchr(" \t\\", buf[offs]) == NULL)
		mac[i++] = buf[offs++];

	mac[i] = '\0';

	tok = (i > 0 && i < 4) ? man_hash_find(mac) : MAN_MAX;

	if (tok == MAN_MAX) {
		mandoc_msg(MANDOCERR_MACRO, man->parse,
		    ln, ppos, buf + ppos - 1);
		return(1);
	}

	/* Skip a leading escape sequence or tab. */

	switch (buf[offs]) {
	case '\\':
		cp = buf + offs + 1;
		mandoc_escape(&cp, NULL, NULL);
		offs = cp - buf;
		break;
	case '\t':
		offs++;
		break;
	default:
		break;
	}

	/* Jump to the next non-whitespace word. */

	while (buf[offs] && buf[offs] == ' ')
		offs++;

	/*
	 * Trailing whitespace.  Note that tabs are allowed to be passed
	 * into the parser as "text", so we only warn about spaces here.
	 */

	if (buf[offs] == '\0' && buf[offs - 1] == ' ')
		mandoc_msg(MANDOCERR_SPACE_EOL, man->parse,
		    ln, offs - 1, NULL);

	/*
	 * Some macros break next-line scopes; otherwise, remember
	 * whether we are in next-line scope for a block head.
	 */

	man_breakscope(man, tok);
	bline = man->flags & MAN_BLINE;

	/* Call to handler... */

	assert(man_macros[tok].fp);
	(*man_macros[tok].fp)(man, tok, ln, ppos, &offs, buf);

	/* In quick mode (for mandocdb), abort after the NAME section. */

	if (man->quick && tok == MAN_SH) {
		n = man->last;
		if (n->type == ROFFT_BODY &&
		    strcmp(n->prev->child->string, "NAME"))
			return(2);
	}

	/*
	 * If we are in a next-line scope for a block head,
	 * close it out now and switch to the body,
	 * unless the next-line scope is allowed to continue.
	 */

	if ( ! bline || man->flags & MAN_ELINE ||
	    man_macros[tok].flags & MAN_NSCOPED)
		return(1);

	assert(man->flags & MAN_BLINE);
	man->flags &= ~MAN_BLINE;

	man_unscope(man, man->last->parent);
	man_body_alloc(man, ln, ppos, man->last->tok);
	return(1);
}

void
man_breakscope(struct man *man, int tok)
{
	struct roff_node *n;

	/*
	 * An element next line scope is open,
	 * and the new macro is not allowed inside elements.
	 * Delete the element that is being broken.
	 */

	if (man->flags & MAN_ELINE && (tok == MAN_MAX ||
	    ! (man_macros[tok].flags & MAN_NSCOPED))) {
		n = man->last;
		assert(n->type != ROFFT_TEXT);
		if (man_macros[n->tok].flags & MAN_NSCOPED)
			n = n->parent;

		mandoc_vmsg(MANDOCERR_BLK_LINE, man->parse,
		    n->line, n->pos, "%s breaks %s",
		    tok == MAN_MAX ? "TS" : man_macronames[tok],
		    man_macronames[n->tok]);

		man_node_delete(man, n);
		man->flags &= ~MAN_ELINE;
	}

	/*
	 * A block header next line scope is open,
	 * and the new macro is not allowed inside block headers.
	 * Delete the block that is being broken.
	 */

	if (man->flags & MAN_BLINE && (tok == MAN_MAX ||
	    man_macros[tok].flags & MAN_BSCOPE)) {
		n = man->last;
		if (n->type == ROFFT_TEXT)
			n = n->parent;
		if ( ! (man_macros[n->tok].flags & MAN_BSCOPE))
			n = n->parent;

		assert(n->type == ROFFT_HEAD);
		n = n->parent;
		assert(n->type == ROFFT_BLOCK);
		assert(man_macros[n->tok].flags & MAN_SCOPED);

		mandoc_vmsg(MANDOCERR_BLK_LINE, man->parse,
		    n->line, n->pos, "%s breaks %s",
		    tok == MAN_MAX ? "TS" : man_macronames[tok],
		    man_macronames[n->tok]);

		man_node_delete(man, n);
		man->flags &= ~MAN_BLINE;
	}
}

/*
 * Unlink a node from its context.  If "man" is provided, the last parse
 * point will also be adjusted accordingly.
 */
static void
man_node_unlink(struct man *man, struct roff_node *n)
{

	/* Adjust siblings. */

	if (n->prev)
		n->prev->next = n->next;
	if (n->next)
		n->next->prev = n->prev;

	/* Adjust parent. */

	if (n->parent) {
		n->parent->nchild--;
		if (n->parent->child == n)
			n->parent->child = n->prev ? n->prev : n->next;
	}

	/* Adjust parse point, if applicable. */

	if (man && man->last == n) {
		/*XXX: this can occur when bailing from validation. */
		/*assert(NULL == n->next);*/
		if (n->prev) {
			man->last = n->prev;
			man->next = MAN_NEXT_SIBLING;
		} else {
			man->last = n->parent;
			man->next = MAN_NEXT_CHILD;
		}
	}

	if (man && man->first == n)
		man->first = NULL;
}

const struct mparse *
man_mparse(const struct man *man)
{

	assert(man && man->parse);
	return(man->parse);
}

void
man_deroff(char **dest, const struct roff_node *n)
{
	char	*cp;
	size_t	 sz;

	if (n->type != ROFFT_TEXT) {
		for (n = n->child; n; n = n->next)
			man_deroff(dest, n);
		return;
	}

	/* Skip leading whitespace and escape sequences. */

	cp = n->string;
	while ('\0' != *cp) {
		if ('\\' == *cp) {
			cp++;
			mandoc_escape((const char **)&cp, NULL, NULL);
		} else if (isspace((unsigned char)*cp))
			cp++;
		else
			break;
	}

	/* Skip trailing whitespace. */

	for (sz = strlen(cp); sz; sz--)
		if (0 == isspace((unsigned char)cp[sz-1]))
			break;

	/* Skip empty strings. */

	if (0 == sz)
		return;

	if (NULL == *dest) {
		*dest = mandoc_strndup(cp, sz);
		return;
	}

	mandoc_asprintf(&cp, "%s %*s", *dest, (int)sz, cp);
	free(*dest);
	*dest = cp;
}