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-.nr PS 12
-.nr VS 14
-.LP
-.TL
-Design of grohtml
-.sp 1i
-.SH
-What is grohtml
-.LP
-Grohtml is a back end for groff which generates html.
-The aim of grohtml is to produce respectible html given
-fairly typical groff input.
-.SH
-Limitations of grohtml
-.LP
-Although basic text can be translated
-in a straightforward fashion there are some areas where grohtml
-has to try and guess text relationship. In particular whenever
-grohtml encounters text tables and indented paragraphs or
-two column mode it will try and utilize the html table construct
-to preserve columns. Grohtml also attempts to work out which
-lines should be automatically formatted by the browser.
-Ultimately in trying to make reasonable guesses most of the time
-it will make mistakes occasionally.
-.PP
-Tbl, pic, eqn's are also generated using images which may be
-considered a limitation.
-.SH
-Overview of html.cc
-.LP
-This file briefly provides an overview of how html.cc operates.
-The html device driver works as follows:
-.IP (i) .5i
-firstly it creates a linked list of all words on a page.
-.IP (ii) .5i
-it runs through the page and finds the left most margin. Later
-on when generating the page it removes the margin.
-.IP (iii) .5i
-scans a page and builds two kinds of regions ascii text and graphical.
-The graphical regions consist of tbl's, eqn's, pic's
-(basically anything that cannot be textually displayed).
-It will scan through a page to find lines (such as footer etc)
-and places these into tiny graphical regions. Certain fonts
-also are treated as a graphical region - as html has no easy
-equivalent. For example Greek math symbols.
-.LP
-Finally all graphical regions are translated into png files and
-all text regions into html text.
-.PP
-To give grohtml a sporting chance of accuratly deciding which
-is a graphical region and which is text, the front end programs
-tbl, eqn, pic have all been tweeked to encapsulate pictures, tables
-and equations with the following lines:
-.sp
-.nf
-\f[CR]\&.if '\\*(.T'html' \\X(graphic-start(\c
-
-\&.if '\\*(.T'html' \\X(graphic-end(\c
-\fP
-.fi
-.sp
-these appear to grohtml as:
-.sp
-.nf
-\f[CR]\&x X graphic-start
-
-\&...
-
-\&x X graphic-end\fP
-.fi
-.sp
-.LP
-In addition to graphic-start and graphic-end there are two
-other "special characters" which are used.
-.sp
-\f[CR]\&x X index:N\fP
-.sp
-where N is a number. The purpose of this sequence is to stop
-devhtml from automatically producing links to headings which
-have a header level >N.
-The line:
-.sp
-\f[CR]\&x X html:STRING\fR
-.sp
-.LP
-allows a STRING to be passed through to the output file with
-no processing whatsoever. Ie it allows users to include html
-commands, via macro, such as:
-.sp
-\f[CR]\&.URL "Latest Emacs" "ftp://somewonderful.gnu.software"\fP
-.sp
-.LP
-Where the URL macro bundles the info into STRING above.
-For more info consult: \f[CR]tmac/tmac.arkup\fP.
-.PP
-While scanning through a page the html device copies headings and titles
-into a list of links which are later written to the beginning
-of the html document.
-.SH
-Table handling code
-.LP
-Provided that the -t option is not present when grohtml is run the grohtml
-driver will attempt to find textual tables and generate html tables.
-This allows .RS and .RE commands to operate with auto formatting. It also
-should grohtml to process .2C correctly. However, the table handling code
-has to examine the troff output and \fIguess\fR when a table starts and
-finishes. It is well to know the limitations of this approach as it
-sometimes makes the wrong decision.
-.LP
-Here are some of the rules that grohtml uses for terminating a html table:
-.LP
-.IP "(i)" .5i
-A table will be terminated when grohtml finds line which is all in bold
-font (it believes that this is a header which is outside of a table).
-This might be considered incorrect behaviour especially if you use .2C
-which generates a heading on the left column when the corresponding
-right row is blank.
-.IP "(ii)" .5i
-A table is terminated when grohtml sees that the complete line is
-has been spanned by words. Ie no gaps exist.
-.IP "(nb)" .5i
-the documentation about these rules is particularly incomplete and needs finishing
-when time prevails.
-.SH
-Dependencies
-.LP
-Grohtml is dependent upon grops, gs which are invoked to
-generate all png files. Png files are generated whenever a table, picture,
-equation or line is encountered.