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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