\section migration-lgf LGF tools

 \section migration-lgf LGF tools 

  - The \ref lgf-format "LGF file format" has changed,

    <tt>\@nodeset</tt> has changed to <tt>\@nodes</tt>,

    <tt>\@edgeset</tt> and <tt>\@uedgeset</tt> to <tt>\@arcs</tt> or

    <tt>\@edges</tt>, which become completely equivalents. The

    <tt>\@nodes</tt>, <tt>\@edges</tt> and <tt>\@uedges</tt> sections are

    removed from the format, the content of them should be

    the part of <tt>\@attributes</tt> section. The data fields in

    the sections must follow a strict format, they must be either character

    sequences without whitespaces or quoted strings.

  - The <tt>LemonReader</tt> and <tt>LemonWriter</tt> core interfaces

    are no longer available.

  - The implementation of the general section readers and writers has changed

    they are simple functors now. Beside the old

    stream based section handling, currently line oriented section

    reading and writing are also supported. In the

    section readers the lines must be counted manually. The sections

    should be read and written with the SectionWriter and SectionReader

    classes.

  - Instead of the item readers and writers, item converters should be

    used. The converters are functors, which map the type to

    std::string or std::string to the type. The converters for standard

    containers hasn't yet been implemented in the new LEMON. The converters

    can return strings in any format, because if it is necessary, the LGF

    writer and reader will quote and unquote the given value.

  - The DigraphReader and DigraphWriter can used similarly to the

    0.x series, however the <tt>read</tt> or <tt>write</tt> prefix of

    the member functions are removed.

  - The new LEMON supports the function like interface, the \c

    digraphReader and \c digraphWriter functions are more convenient than

    using the classes directly.