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/*
  text.cpp
*/

#include <qregexp.h>
#include "text.h"
#include <stdio.h>

QT_BEGIN_NAMESPACE

Text::Text()
    : first(0), last(0)
{
}

Text::Text(const QString &str)
    : first(0), last(0)
{
    operator<<(str);
}

Text::Text( const Text& text )
    : first(0), last(0)
{
    operator=( text );
}

Text::~Text()
{
    clear();
}

Text& Text::operator=( const Text& text )
{
    if ( this != &text ) {
	clear();
	operator<<( text );
    }
    return *this;
}

Text& Text::operator<<( Atom::Type atomType )
{
    return operator<<( Atom(atomType) );
}

Text& Text::operator<<( const QString& string )
{
    return operator<<( Atom(Atom::String, string) );
}

Text& Text::operator<<( const Atom& atom )
{
    if ( first == 0 ) {
	first = new Atom( atom.type(), atom.string() );
	last = first;
    } else {
	last = new Atom( last, atom.type(), atom.string() );
    }
    return *this;
}

Text& Text::operator<<( const Text& text )
{
    const Atom *atom = text.firstAtom();
    while ( atom != 0 ) {
	operator<<( *atom );
	atom = atom->next();
    }
    return *this;
}

void Text::stripFirstAtom()
{
    if ( first != 0 ) {
	if ( first == last )
	    last = 0;
	Atom *oldFirst = first;
	first = first->next();
	delete oldFirst;
    }
}

void Text::stripLastAtom()
{
    if ( last != 0 ) {
	Atom *oldLast = last;
	if ( first == last ) {
	    first = 0;
	    last = 0;
	} else {
	    last = first;
	    while ( last->next() != oldLast )
		last = last->next();
	    last->setNext( 0 );
	}
	delete oldLast;
    }
}

QString Text::toString() const
{
    QString str;
    const Atom *atom = firstAtom();
    while ( atom != 0 ) {
	if ( atom->type() == Atom::String || atom->type() == Atom::AutoLink )
	    str += atom->string();
	atom = atom->next();
    }
    return str;
}

Text Text::subText( Atom::Type left, Atom::Type right, const Atom *from ) const
{
    const Atom *begin = from ? from : firstAtom();
    const Atom *end;

    while ( begin != 0 && begin->type() != left )
	begin = begin->next();
    if ( begin != 0 )
	begin = begin->next();

    end = begin;
    while ( end != 0 && end->type() != right )
	end = end->next();
    if ( end == 0 )
	begin = 0;
    return subText( begin, end );
}

Text Text::sectionHeading(const Atom *sectionLeft)
{
    if ( sectionLeft != 0 ) {
	const Atom *begin = sectionLeft;
	while ( begin != 0 && begin->type() != Atom::SectionHeadingLeft )
	    begin = begin->next();
	if ( begin != 0 )
	    begin = begin->next();

	const Atom *end = begin;
	while ( end != 0 && end->type() != Atom::SectionHeadingRight )
	    end = end->next();

	if ( end != 0 )
	    return subText( begin, end );
    }
    return Text();
}

const Atom *Text::sectionHeadingAtom(const Atom *sectionLeft)
{
    if ( sectionLeft != 0 ) {
	const Atom *begin = sectionLeft;
	while ( begin != 0 && begin->type() != Atom::SectionHeadingLeft )
	    begin = begin->next();
	if ( begin != 0 )
	    begin = begin->next();

	return begin;
    }
    return 0;
}

void Text::dump() const
{
    const Atom *atom = firstAtom();
    while ( atom != 0 ) {
	QString str = atom->string();
	str.replace( "\\", "\\\\" );
	str.replace( "\"", "\\\"" );
	str.replace( "\n", "\\n" );
	str.replace( QRegExp("[^\x20-\x7e]"), "?" );
	if ( !str.isEmpty() )
	    str = " \"" + str + "\"";
	fprintf(stderr, "    %-15s%s\n", atom->typeString().toLatin1().data(), str.toLatin1().data() );
	atom = atom->next();
    }
}

Text Text::subText( const Atom *begin, const Atom *end )
{
    Text text;
    if ( begin != 0 ) {
	while ( begin != end ) {
	    text << *begin;
	    begin = begin->next();
	}
    }
    return text;
}

void Text::clear()
{
    while ( first != 0 ) {
	Atom *atom = first;
	first = first->next();
	delete atom;
    }
    first = 0;
    last = 0;
}

int Text::compare(const Text &text1, const Text &text2)
{
    if (text1.isEmpty())
	return text2.isEmpty() ? 0 : -1;
    if (text2.isEmpty())
	return 1;

    const Atom *atom1 = text1.firstAtom();
    const Atom *atom2 = text2.firstAtom();

    for (;;) {
	if (atom1->type() != atom2->type())
	    return (int)atom1->type() - (int)atom2->type();
	int cmp = QString::compare(atom1->string(), atom2->string());
        if (cmp != 0)
	    return cmp;

    	if (atom1 == text1.lastAtom())
	    return atom2 == text2.lastAtom() ? 0 : -1;
	if (atom2 == text2.lastAtom())
	    return 1;
	atom1 = atom1->next();
        atom2 = atom2->next();
    }
}

QT_END_NAMESPACE
