% $Header: /cvsroot/html2ps/postscript/box.inline.whitespace.ps,v 1.1 2005/12/18 07:21:36 Konstantin Exp $

% Whitespace flow control function. Do nothing if whitespace is at the beginning of the line box
% make a inline box containining space symbol otherwise. 
/flow-whitespace {                 % => Parent Child
  1 index get-current-x
  2 index get-current-y       % => Parent Child X Y
  2 index
  move-to-box                 % => Parent Child

% Check if there are any boxes in parent's line box
  1 index
  get-line
  length 0 gt {
      % there's some boxes in the parent's line box already
      % just make a space (if previous inline box wasn't a whitespace!)
      1 index get-line
      dup length 1 sub get       % => Parent Child LastInlineBox

      get-box-dict
      /Display get
      /inline-whitespace ne {
        dup get-default-baseline 
        1 index put-baseline

        apply-line-height

        dup get-vertical-align exec

        dup /get-width call-method
        2 index get-current-x
        add
        2 index put-current-x
      } {
% Duplicate whitespace boxes should not offset further content and affect the line box length
        0 1 index put-width
% Make whitespace correctly aligned relative to the baseline
        dup get-vertical-align exec            
      } ifelse
  } {
% The very first whitespace in the line box should not affect neither height nor baseline of the line box;
% because following boxes can be smaller that assumed whitespace height
% Example: <br>[whitespace]<img height="2" width="2"><br>; whitespace can overextend this line
    0 1 index put-height
% Aslo, the very first whitespace should not offset further content and affect the line box length
    0 1 index put-width
  } ifelse

  dup 2 index append-line 

%  dup get-baseline
%  1 index get-default-baseline
%  sub
%  1 index get-full-height
%  add
  dup get-full-height
  exch pop
  extend-height                 % => Parent
  
  pop 
} def

/make-whitespace-box {             % => FontSize FontName
  ( )
  2 index 2 index
  make-text-box                    % => FontSize FontName Box

  {flow-whitespace}
  1 index put-flow-fun             % => FontSize FontName Box
  dup get-box-dict
  /Display /inline-whitespace put

  3 1 roll
  pop pop
} def