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/**
* $Id: box.c,v 1.9 2002/06/28 20:14:04 bursa Exp $
*/
#include <assert.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libxml/HTMLparser.h"
#include "css.h"
#include "font.h"
#include "box.h"
#include "utils.h"
/**
* internal functions
*/
void box_add_child(struct box * parent, struct box * child);
struct box * box_create(xmlNode * node, box_type type, struct css_style * style);
struct css_style * box_get_style(struct css_stylesheet * stylesheet, struct css_style * parent_style,
xmlNode * n, struct css_selector * selector, unsigned int depth);
/**
* add a child to a box tree node
*/
void box_add_child(struct box * parent, struct box * child)
{
if (parent->children) /* has children already */
parent->last->next = child;
else /* this is the first child */
parent->children = child;
parent->last = child;
child->parent = parent;
}
/**
* create a box tree node
*/
struct box * box_create(xmlNode * node, box_type type, struct css_style * style)
{
struct box * box = xcalloc(1, sizeof(struct box));
box->node = node;
box->type = type;
box->style = style;
return box;
}
/**
* make a box tree with style data from an xml tree
*
* arguments:
* n xml tree
* parent_style style at this point in xml tree
* stylesheet stylesheet to use
* selector element selector hierachy to this point
* depth depth in xml tree
* parent parent in box tree
* inline_container current inline container box, or 0
*
* returns:
* updated current inline container
*/
struct box * xml_to_box(xmlNode * n, struct css_style * parent_style, struct css_stylesheet * stylesheet,
struct css_selector ** selector, unsigned int depth,
struct box * parent, struct box * inline_container)
{
struct box * box;
struct box * inline_container_c;
struct css_style * style, * style2;
xmlNode * c;
char * s;
if (n->type == XML_ELEMENT_NODE) {
/* work out the style for this element */
*selector = xrealloc(*selector, (depth + 1) * sizeof(struct css_selector));
(*selector)[depth].element = (const char *) n->name;
(*selector)[depth].class = (*selector)[depth].id = 0;
if ((s = (char *) xmlGetProp(n, (xmlChar *) "class")))
(*selector)[depth].class = s;
style = box_get_style(stylesheet, parent_style, n, *selector, depth + 1);
if (style->display == CSS_DISPLAY_NONE)
return inline_container;
}
if (n->type == XML_TEXT_NODE ||
(n->type == XML_ELEMENT_NODE && (style->float_ == CSS_FLOAT_LEFT ||
style->float_ == CSS_FLOAT_RIGHT))) {
/* text nodes are converted to inline boxes, wrapped in an inline container block */
if (inline_container == 0) { /* this is the first inline node: make a container */
inline_container = xcalloc(1, sizeof(struct box));
inline_container->type = BOX_INLINE_CONTAINER;
switch (parent->type) {
case BOX_TABLE:
/* insert implied table row and cell */
style2 = xcalloc(1, sizeof(struct css_style));
memcpy(style2, parent_style, sizeof(struct css_style));
css_cascade(style2, &css_blank_style);
box = box_create(0, BOX_TABLE_ROW, style2);
box_add_child(parent, box);
parent = box;
/* fall through */
case BOX_TABLE_ROW:
/* insert implied table cell */
style2 = xcalloc(1, sizeof(struct css_style));
memcpy(style2, parent_style, sizeof(struct css_style));
css_cascade(style2, &css_blank_style);
box = box_create(0, BOX_TABLE_CELL, style2);
box->colspan = 1;
box_add_child(parent, box);
parent = box;
break;
case BOX_BLOCK:
case BOX_TABLE_CELL:
case BOX_FLOAT_LEFT:
case BOX_FLOAT_RIGHT:
break;
default:
assert(0);
}
box_add_child(parent, inline_container);
}
if (n->type == XML_TEXT_NODE) {
box = box_create(n, BOX_INLINE, 0);
box->text = squash_whitespace((char *) n->content);
box->length = strlen(box->text);
box_add_child(inline_container, box);
} else {
box = box_create(0, BOX_FLOAT_LEFT, 0);
if (style->float_ == CSS_FLOAT_RIGHT) box->type = BOX_FLOAT_RIGHT;
box_add_child(inline_container, box);
style->float_ = CSS_FLOAT_NONE;
parent = box;
if (style->display == CSS_DISPLAY_INLINE)
style->display = CSS_DISPLAY_BLOCK;
}
}
if (n->type == XML_ELEMENT_NODE) {
switch (style->display) {
case CSS_DISPLAY_BLOCK: /* blocks get a node in the box tree */
switch (parent->type) {
case BOX_TABLE:
/* insert implied table row and cell */
style2 = xcalloc(1, sizeof(struct css_style));
memcpy(style2, parent_style, sizeof(struct css_style));
css_cascade(style2, &css_blank_style);
box = box_create(0, BOX_TABLE_ROW, style2);
box_add_child(parent, box);
parent = box;
/* fall through */
case BOX_TABLE_ROW:
/* insert implied table cell */
style2 = xcalloc(1, sizeof(struct css_style));
memcpy(style2, parent_style, sizeof(struct css_style));
css_cascade(style2, &css_blank_style);
box = box_create(0, BOX_TABLE_CELL, style2);
box->colspan = 1;
box_add_child(parent, box);
parent = box;
break;
case BOX_BLOCK:
case BOX_TABLE_CELL:
case BOX_FLOAT_LEFT:
case BOX_FLOAT_RIGHT:
break;
default:
assert(0);
}
box = box_create(n, BOX_BLOCK, style);
box_add_child(parent, box);
inline_container_c = 0;
for (c = n->children; c != 0; c = c->next)
inline_container_c = xml_to_box(c, style, stylesheet,
selector, depth + 1, box, inline_container_c);
inline_container = 0;
break;
case CSS_DISPLAY_INLINE: /* inline elements get no box, but their children do */
for (c = n->children; c != 0; c = c->next)
inline_container = xml_to_box(c, style, stylesheet,
selector, depth + 1, parent, inline_container);
break;
case CSS_DISPLAY_TABLE:
box = box_create(n, BOX_TABLE, style);
box_add_child(parent, box);
for (c = n->children; c != 0; c = c->next)
xml_to_box(c, style, stylesheet,
selector, depth + 1, box, 0);
inline_container = 0;
break;
case CSS_DISPLAY_TABLE_ROW:
if (parent->type != BOX_TABLE) {
/* insert implied table */
style2 = xcalloc(1, sizeof(struct css_style));
memcpy(style2, parent_style, sizeof(struct css_style));
css_cascade(style2, &css_blank_style);
box = box_create(0, BOX_TABLE, style2);
box_add_child(parent, box);
parent = box;
}
assert(parent->type == BOX_TABLE);
box = box_create(n, BOX_TABLE_ROW, style);
box_add_child(parent, box);
for (c = n->children; c != 0; c = c->next)
xml_to_box(c, style, stylesheet,
selector, depth + 1, box, 0);
inline_container = 0;
break;
case CSS_DISPLAY_TABLE_CELL:
assert(parent->type == BOX_TABLE_ROW);
box = box_create(n, BOX_TABLE_CELL, style);
if ((s = (char *) xmlGetProp(n, (xmlChar *) "colspan"))) {
if ((box->colspan = strtol(s, 0, 10)) == 0)
box->colspan = 1;
} else
box->colspan = 1;
box_add_child(parent, box);
inline_container_c = 0;
for (c = n->children; c != 0; c = c->next)
inline_container_c = xml_to_box(c, style, stylesheet,
selector, depth + 1, box, inline_container_c);
inline_container = 0;
break;
default:
break;
}
}
return inline_container;
}
/*
* get the style for an element
*/
struct css_style * box_get_style(struct css_stylesheet * stylesheet, struct css_style * parent_style,
xmlNode * n, struct css_selector * selector, unsigned int depth)
{
struct css_style * style = xcalloc(1, sizeof(struct css_style));
char * s;
memcpy(style, parent_style, sizeof(struct css_style));
css_get_style(stylesheet, selector, depth, style);
if ((s = (char *) xmlGetProp(n, (xmlChar *) "align"))) {
if (strcmp((const char *) n->name, "table") == 0 ||
strcmp((const char *) n->name, "img") == 0) {
if (strcmp(s, "left") == 0) style->float_ = CSS_FLOAT_LEFT;
else if (strcmp(s, "right") == 0) style->float_ = CSS_FLOAT_RIGHT;
} else {
if (strcmp(s, "left") == 0) style->text_align = CSS_TEXT_ALIGN_LEFT;
else if (strcmp(s, "center") == 0) style->text_align = CSS_TEXT_ALIGN_CENTER;
else if (strcmp(s, "right") == 0) style->text_align = CSS_TEXT_ALIGN_RIGHT;
}
}
if ((s = (char *) xmlGetProp(n, (xmlChar *) "clear"))) {
if (strcmp(s, "all") == 0) style->clear = CSS_CLEAR_BOTH;
else if (strcmp(s, "left") == 0) style->clear = CSS_CLEAR_LEFT;
else if (strcmp(s, "right") == 0) style->clear = CSS_CLEAR_RIGHT;
}
if ((s = (char *) xmlGetProp(n, (xmlChar *) "width"))) {
if (strrchr(s, '%'))
style->width.width = CSS_WIDTH_PERCENT,
style->width.value.percent = atof(s);
else
style->width.width = CSS_WIDTH_LENGTH,
style->width.value.length.unit = CSS_UNIT_PX,
style->width.value.length.value = atof(s);
}
if ((s = (char *) xmlGetProp(n, (xmlChar *) "style"))) {
struct css_style * astyle = xcalloc(1, sizeof(struct css_style));
memcpy(astyle, &css_empty_style, sizeof(struct css_style));
css_parse_property_list(astyle, s);
css_cascade(style, astyle);
free(astyle);
free(s);
}
return style;
}
/*
* print a box tree to standard output
*/
void box_dump(struct box * box, unsigned int depth)
{
unsigned int i;
struct box * c;
for (i = 0; i < depth; i++)
fprintf(stderr, " ");
fprintf(stderr, "x%li y%li w%li h%li ", box->x, box->y, box->width, box->height);
switch (box->type) {
case BOX_BLOCK: fprintf(stderr, "BOX_BLOCK "); break;
case BOX_INLINE_CONTAINER: fprintf(stderr, "BOX_INLINE_CONTAINER "); break;
case BOX_INLINE: fprintf(stderr, "BOX_INLINE '%.*s' ",
(int) box->length, box->text); break;
case BOX_TABLE: fprintf(stderr, "BOX_TABLE "); break;
case BOX_TABLE_ROW: fprintf(stderr, "BOX_TABLE_ROW "); break;
case BOX_TABLE_CELL: fprintf(stderr, "BOX_TABLE_CELL [colspan %i] ",
box->colspan); break;
case BOX_FLOAT_LEFT: fprintf(stderr, "BOX_FLOAT_LEFT "); break;
case BOX_FLOAT_RIGHT: fprintf(stderr, "BOX_FLOAT_RIGHT "); break;
default: fprintf(stderr, "Unknown box type ");
}
if (box->node)
fprintf(stderr, "<%s> ", box->node->name);
if (box->style)
css_dump_style(box->style);
fprintf(stderr, "\n");
for (c = box->children; c != 0; c = c->next)
box_dump(c, depth + 1);
}
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