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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* SVG <text> and <tspan> implementation
*
* Author:
* Lauris Kaplinski <lauris@kaplinski.com>
* Jon A. Cruz <jon@joncruz.org>
* Abhishek Sharma
*
* Copyright (C) 1999-2002 Lauris Kaplinski
* Copyright (C) 2000-2001 Ximian, Inc.
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
/*
* fixme:
*
* These subcomponents should not be items, or alternately
* we have to invent set of flags to mark, whether standard
* attributes are applicable to given item (I even like this
* idea somewhat - Lauris)
*
*/
#include "sp-string.h"
#include "style.h"
/*#####################################################
# SPSTRING
#####################################################*/
SPString::SPString() : SPObject() {
// This is dangerous but strings shouldn't have style.
// delete (style);
// style = nullptr;
}
SPString::~SPString() = default;
void SPString::build(SPDocument *doc, Inkscape::XML::Node *repr) {
read_content();
SPObject::build(doc, repr);
}
void SPString::release() {
SPObject::release();
}
void SPString::read_content() {
string.clear();
//XML Tree being used directly here while it shouldn't be.
gchar const *xml_string = getRepr()->content();
// std::cout << ">" << (xml_string?xml_string:"Null") << "<" << std::endl;
// SVG2/CSS Text Level 3 'white-space' has five values.
// See: http://dev.w3.org/csswg/css-text/#white-space
// | New Lines | Spaces/Tabs | Text Wrapping
// ---------|------------|--------------|--------------
// normal | Collapse | Collapse | Wrap
// pre | Preserve | Preserve | No Wrap
// nowrap | Collapse | Collapse | No Wrap
// pre-wrap | Preserve | Preserve | Wrap
// pre-line | Preserve | Collapse | Wrap
// 'xml:space' has two values:
// 'default' which corresponds to 'normal' (without wrapping).
// 'preserve' which corresponds to 'pre' except new lines are converted to spaces.
// See algorithms described in svg 1.1 section 10.15
bool collapse_space = true;
bool collapse_line = true;
bool is_css = false;
// Strings don't have style, check parent for style
if( parent && parent->style ) {
if( parent->style->white_space.computed == SP_CSS_WHITE_SPACE_PRE ||
parent->style->white_space.computed == SP_CSS_WHITE_SPACE_PREWRAP ||
parent->style->white_space.computed == SP_CSS_WHITE_SPACE_PRELINE ) {
collapse_line = false;
}
if( parent->style->white_space.computed == SP_CSS_WHITE_SPACE_PRE ||
parent->style->white_space.computed == SP_CSS_WHITE_SPACE_PREWRAP ) {
collapse_space = false;
}
if( parent->style->white_space.computed != SP_CSS_WHITE_SPACE_NORMAL ) {
is_css = true; // If white-space not normal, we assume white-space is set.
}
}
if( !is_css ) {
// SVG 2: Use 'xml:space' only if 'white-space' not 'normal'.
if (xml_space.value == SP_XML_SPACE_PRESERVE) {
collapse_space = false;
}
}
bool white_space = false;
for ( ; *xml_string ; xml_string = g_utf8_next_char(xml_string) ) {
gunichar c = g_utf8_get_char(xml_string);
switch (c) {
case 0xd: // Carriage return
// XML Parsers convert 0xa, 0xd, 0xD 0xA to 0xA. CSS also follows this rule so we
// should never see 0xd.
std::cerr << "SPString: Carriage Return found! Argh!" << std::endl;
continue;
break;
case 0xa: // Line feed
if( collapse_line ) {
if( !is_css && collapse_space ) continue; // xml:space == 'default' strips LFs.
white_space = true; // Convert to space and collapse
} else {
string += c; // Preserve line feed
continue;
}
break;
case '\t': // Tab
if( collapse_space ) {
white_space = true; // Convert to space and collapse
} else {
string += c; // Preserve tab
continue;
}
break;
case ' ': // Space
if( collapse_space ) {
white_space = true; // Collapse white space
} else {
string += c; // Preserve space
continue;
}
break;
default:
if( white_space && (!string.empty() || (getPrev() != nullptr))) {
string += ' ';
}
string += c;
white_space = false;
} // End switch
} // End loop
// Insert white space at end if more text follows
if (white_space && getRepr()->next() != nullptr) { // can't use SPObject::getNext() when the SPObject tree is still being built
string += ' ';
}
// std::cout << ">" << string << "<" << std::endl;
requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
}
void SPString::update(SPCtx * /*ctx*/, unsigned /*flags*/) {
// if (flags & (SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_MODIFIED_FLAG)) {
// /* Parent style or we ourselves changed, so recalculate */
// flags &= ~SP_OBJECT_USER_MODIFIED_FLAG_B; // won't be "just a transformation" anymore, we're going to recompute "x" and "y" attributes
// }
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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