package tex61;

import static tex61.FormatException.error;

/** A PageAssembler accepts complete lines of text (minus any
 *  terminating newlines) and turns them into pages, adding form
 *  feeds as needed.  It prepends a form feed (Control-L  or ASCII 12)
 *  to the first line of each page after the first.  By overriding the
 *  'write' method, subtypes can determine what is done with
 *  the finished lines.
 *  @author
 */
abstract class PageAssembler {

    /** Create a new PageAssembler. Initially, its text height is unlimited.
     *  It prepends a form feed character to the first line of each page
     *  except the first. */
    PageAssembler() {
        // FIXME
    }

    /** Add LINE to the current page, starting a new page with it if
     *  the previous page is full. A null LINE indicates a skipped line,
     *  and has no effect at the top of a page. */
    void addLine(String line) {
        // FIXME
    }

    /** Set text height to VAL, where VAL > 0. */
    void setTextHeight(int val) {
        // FIXME
    }

    /** Perform final disposition of LINE, as determined by the
     *  concrete subtype. */
    abstract void write(String line);

    // FIXME

}