📄 html.c

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/******************************************************************************* * * html.c - HTML parsing engine * * Actual html tag implementations * * Cheetah Web Browser * Copyright (C) 2001 Garett Spencley  *  * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  * *******************************************************************************/#include <string.h>#include <stdio.h>#include <stdlib.h>#include <errno.h>#include "htmltokenizer.h"#include "html.h"#include "gui.h"#include "error.h"#include "dw_hruler.h"#include "colors.h"#include "debug.h"#include "image.h"#include "file.h"#include "dw_bullet.h"#include "font.h"static int list_num; /* For ordered lists *//* * html_add_widget() - Add a widget to the page. * taken from dillo */void html_add_widget(html_t *html, DwWidget *widget, char *width, char *height, DwStyle *style){	gint32 fixed_width = -1, fixed_height = -1;	gfloat rel_height = -1,  rel_width = -1;	/* todo: whitespaces etc. */   	if(width) {		if(width[strlen(width) - 1] == '%')        	rel_width = atof(width) / 100;      	else         	fixed_width = atoi(width);	}	if(height) {    	if(height[strlen(height) - 1] == '%')        	rel_height = atof(height) / 100;      	else        	fixed_height = atoi(height);   	}	a_Dw_widget_set_usize(widget, fixed_width, fixed_height, -1);	a_Dw_page_add_widget(DW_PAGE(html->dw), widget, rel_width, rel_height, style);}/* * html_pre() - <PRE> tag */__inline int html_pre 	(html_t *html, char *tag, html_tag_args *args, tag_type type) {	if(type == HTML_TAG_CLOSE) {		html_pop_tag(html, PRE);		html->preformatted = FALSE;		return 0;	}	html_push_tag(html, PRE);		html->preformatted = TRUE;	html_set_font(html, "courier", 0, 0);	return 0;}/* * html_head() - <HEAD> tag */__inline int html_head (html_t *html, char *tag, html_tag_args *args, tag_type type) {	switch(type) {	case HTML_TAG_OPEN:		html_push_tag(html, HEAD);		break;	case HTML_TAG_CLOSE:		html_pop_tag(html, HEAD);		break;	}	return 0;}/* * html_q() - <Q> tag */__inline int html_q	(html_t *html, char *tag, html_tag_args *args, tag_type type) {	DwPage *page;	char *quote = "\"";	/* We need to see if this tag is nested. This is only a temporary solution	 * since we also need to be language depend (lang="" argument) but we	 * can't do that until we add support for more than just english	 */	if(html_seek_tag(html, QUOTE) >= 0) 		quote = "\'";	switch(type) {	case HTML_TAG_OPEN:		html_push_tag(html, QUOTE);		break;	case HTML_TAG_CLOSE:		html_pop_tag(html, QUOTE);		break;	}	page = (DwPage *)html->dw;	a_Dw_page_add_text(page, g_strdup(quote), html->stack[html->stack_top].style); 	return 0;}/* * html_title() - <TITLE> tag */__inline int html_title	(html_t *html, char *tag, html_tag_args *args, tag_type type) {	switch(type) {	case HTML_TAG_OPEN:		html_push_tag(html, TITLE);		break;	case HTML_TAG_CLOSE:		html_pop_tag(html, TITLE);		break;	}	return 0;}/* * html_br() - <BR> tag */__inline int html_br (html_t *html, char *tag, html_tag_args *args, tag_type type) {	a_Dw_page_linebreak((DwPage *)html->dw);	return 0;}/* * html_para() - <P> tag */__inline int html_para (html_t *html, char *tag, html_tag_args *args, tag_type type) {	a_Dw_page_parbreak((DwPage *)html->dw, 9);	return 0;}/* * html_header() - <H> tags */__inline int html_header (html_t *html, char *tag, html_tag_args *args, tag_type type) {	int level, size;	int sizes[] = { 24, 18, 18, 14, 12, 10 };	if(type == HTML_TAG_CLOSE) {		html_pop_tag(html, HEADER);		return 0;	}		html_push_tag(html, HEADER);	a_Dw_page_parbreak((DwPage *)html->dw, 9);	level = tag[1] - '0';	size = sizes[level-1]; 	html_set_font(html, "helvetica", size, 1);	return 0;}/* * html_script() - <SCRIPT> tag. */__inline int html_script (html_t *html, char *tag, html_tag_args *args, tag_type type) {	switch(type) {	case HTML_TAG_CLOSE:		html->script = FALSE;		break;	case HTML_TAG_OPEN:		html->script = TRUE;		break;	}	return 0;}/* * html_style() - <STYLE> tag. */__inline int html_style (html_t *html, char *tag, html_tag_args *args, tag_type type){	html_tag_args *cur;	if(type == HTML_TAG_CLOSE)		return 0;	/* <STYLE> isn't allowed outside of <HEAD> */	if(html_seek_tag(html, HEAD) < 0)		return -1;	/* See what kind of style we're dealing with */	cur = args;	while(cur) {					if(strcasecmp(cur->name, "type") == 0)			if(strcasecmp(cur->value, "text/css") == 0)				html->css = TRUE;		cur = cur->next;	}		return 0;}/* * html_tt() - <TT> tag */__inline int html_tt (html_t *html, char *tag, html_tag_args *args, tag_type type) {	DwStyle style_attrs;	DwStyleFont font;	if(type == HTML_TAG_CLOSE) {		html_pop_tag(html, TT);		return 0;	}	style_attrs = *(html->stack[html->stack_top].style);	font = *(style_attrs.font);	html_push_tag(html, TT);	html_set_font(html, "courier", font.size - 4.0, -1);	return 0;}/* * html_bold() - <B> tag */__inline int html_bold (html_t *html, char *tag, html_tag_args *args, tag_type type) {	int i, flag;	if(type == HTML_TAG_CLOSE) {		html_pop_tag(html, BOLD);		return 0;	}	/* We have to make sure that if we're inside some other font-modifying tag we don't 	 * screw it up */	flag = 0;	for(i = 0; i <= html->stack_top; i++) {		switch(html->stack[i].tag) {		case STRONG:			return 0;		case ITALIC:		case CITE:		case EM:			flag += 2;			break;		}	}		html_push_tag(html, BOLD);	html_set_font(html, NULL, 0, flag + 1);	return 0;}/* * html_var() - <VAR> tag */__inline int html_var (html_t *html, char *tag, html_tag_args *args, tag_type type) {	int i, flag;	if(type == HTML_TAG_CLOSE) {		html_pop_tag(html, VAR);		return 0;	}	/* We have to make sure that if we're inside some other font-modifying tag we don't 	 * screw it up */	flag = 0;	for(i = 0; i <= html->stack_top; i++) {		switch(html->stack[i].tag) {		case EM:		case ITALIC:		case CITE:		case DFN:		case ADDRESS:			return 0;		case BOLD: 		case STRONG:			flag = 1;			break;		}	}	html_push_tag(html, VAR);	html_set_font(html, NULL, 0, flag + 2);	return 0;}/* * html_small() - <SMALL> tag */__inline int html_small (html_t *html, char *tag, html_tag_args *args, tag_type type) {	DwStyle attr;	DwStyleFont font;	if(type == HTML_TAG_CLOSE) {		html_pop_tag(html, SMALL);		return 0;	}    attr = *(html->stack[html->stack_top].style);   	font = *(attr.font);	html_push_tag(html, SMALL);	html_set_font(html, "courier", font.size - 4.0, -1);	return 0;}/* * html_em() - <EM> tag */__inline int html_em (html_t *html, char *tag, html_tag_args *args, tag_type type) {	int i, flag;	if(type == HTML_TAG_CLOSE) {		html_pop_tag(html, EM);		return 0;	}	/* We have to make sure that if we're inside some other font-modifying tag we don't 	 * screw it up */	flag = 0;	for(i = 0; i <= html->stack_top; i++) {		switch(html->stack[i].tag) {		case VAR:		case ITALIC:		case CITE: 		case ADDRESS:		case DFN:			return 0;		case BOLD: 		case STRONG:			flag += 1;			break;		}	}	html_push_tag(html, EM);	html_set_font(html, NULL, 0, flag + 2);	return 0;}/* * html_strong() - <STRONG> tag */__inline int html_strong (html_t *html, char *tag, html_tag_args *args, tag_type type) {	int i, flag;	if(type == HTML_TAG_CLOSE) {		html_pop_tag(html, STRONG);		return 0;	}	/* We have to make sure that if we're inside some other font-modifying tag we don't 	 * screw it up */	flag = 0;	for(i = 0; i <= html->stack_top; i++) {		switch(html->stack[i].tag) {		case BOLD:			return 0;		case ITALIC:		case CITE:		case EM:		case DFN:			flag += 2;			break;		}	}	html_push_tag(html, STRONG);	html_set_font(html, NULL, 0, flag + 1);	return 0;}/* * html_ul - <UL> tag */__inline int html_ul (html_t *html, char *tag, html_tag_args *args, tag_type type) {	DwStyle style_attrs;	if(type == HTML_TAG_CLOSE) {		html_pop_tag(html, UL);		return 0;	}	html_push_tag(html, UL);	style_attrs = *(html->stack[html->stack_top].style);	style_attrs.left_indent_rest += 40;    	style_attrs.left_indent_first = style_attrs.left_indent_rest;	a_Dw_style_unref(html->stack[html->stack_top].style);   	html->stack[html->stack_top].style = a_Dw_style_new(&style_attrs, html->cw->window->window);	return 0;}/* * html_sub() - <SUB> tag. */__inline int html_sub (html_t *html, char *tag, html_tag_args *args, tag_type type) {	DwStyle style;	if(type == HTML_TAG_CLOSE) {		html_pop_tag(html, SUB);		return 0;	}	html_push_tag(html, SUB);	style = *(html->stack[html->stack_top].style);	style.SubSup = TEXT_SUB;	a_Dw_style_unref(html->stack[html->stack_top].style);	html->stack[html->stack_top].style = a_Dw_style_new(&style, html->cw->window->window);	return 0;}__inline int html_menu (html_t *html, char *tag, html_tag_args *args, tag_type type) {	/* Deprecated.	 *	 * From W3C: 	 * The DIR element was designed to be used for creating multicolumn directory lists. 	 * The MENU element was designed to be used for single column menu lists. Both elements 	 * have the same structure as UL, just different rendering. In practice, a user agent will 	 * render a DIR or MENU list exactly as a UL list.	 */	html_ul(html, tag, args, type);	return 0;}/* * html_base() - <BASE> tag */__inline int html_base (html_t *html, char *tag, html_tag_args *args, tag_type type) {	html_tag_args *cur;		/* W3C says base *MUST* be in <HEAD> */	if(html_seek_tag(html, HEAD) < 0)		return -1;	/* Find href attribute */	cur = args;	while(cur) {		if(strcasecmp(cur->name, "href") == 0) {			if(html->baseuri)				free(html->baseuri);			html->baseuri = strdup(cur->value);		}		cur = cur->next;	}		return 0;}/* * html_dl() - <DL> tag */__inline int html_dl (html_t *html, char *tag, html_tag_args *args, tag_type type) {	switch(type) {	case HTML_TAG_OPEN:		html_push_tag(html, DL);		break;		case HTML_TAG_CLOSE:		html_pop_tag(html, DL);		break;	}	return 0;}/* * html_blockquote() - <BLOCKQUOTE> tag. */__inline int html_blockquote (html_t *html, char *tag, html_tag_args *args, tag_type type) {	DwStyle attr;	if(type == HTML_TAG_CLOSE) {		html_pop_tag(html, BLOCKQUOTE);		return 0;	}	html_push_tag(html, BLOCKQUOTE);	attr = *(html->stack[html->stack_top].style);	attr.left_indent_rest += 40;   	attr.left_indent_first = attr.left_indent_rest;	attr.right_indent += 40;	a_Dw_style_unref(html->stack[html->stack_top].style);	html->stack[html->stack_top].style = a_Dw_style_new(&attr, html->cw->window->window);	return 0;}/* * html_strike() - <S>, <DEL> and <STRIKE> tags */__inline int html_strike (html_t *html, char *tag, html_tag_args *args, tag_type type) {	DwStyle style_attrs;	if(type == HTML_TAG_CLOSE) {		html_pop_tag(html, STRIKE);		return 0;	}	html_push_tag(html, STRIKE);	style_attrs = *(html->stack[html->stack_top].style);	style_attrs.strike = TRUE;	a_Dw_style_unref (html->stack[html->stack_top].style);   	html->stack[html->stack_top].style = a_Dw_style_new(&style_attrs, html->cw->window->window);	return 0;}/* * html_kbd() - <KBD> tag */__inline int html_kbd (html_t *html, char *tag, html_tag_args *args, tag_type type) {	int i;	if(type == HTML_TAG_CLOSE) {		html_pop_tag(html, KBD);		return 0;	}	for(i = 0; i <= html->stack_top; i++) {		switch(html->stack[i].tag) {			case CODE:			case SAMP:				return 0;		}	}	html_push_tag(html, KBD);	html_set_font(html, "courier", 0, -1);	return 0;}/* * html_ol() - <OL> tag */__inline int html_ol (html_t *html, char *tag, html_tag_args *args, tag_type type) {	DwStyle style_attrs;	if(type == HTML_TAG_CLOSE) {		html_pop_tag(html, OL);		return 0;	}	list_num = 0;	html_push_tag(html, OL);	style_attrs = *( html->stack[html->stack_top].style );	style_attrs.left_indent_rest += 40;
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