###############################################################################
#                                                                             #
#  Lout @PythonSetup package for formatting Python programs                   #
#                                                                             #
#  Version 3.0                                                                #
#  Jeffrey H. Kingston                                                        #
#  5 April 2000                                                               #
#                                                                             #
#  This package uses a filtered body parameter to convert program source      #
#  code into Lout source.  The filter program is prg2lout, which is           #
#  distributed with Lout and should be compiled and installed wherever        #
#  Lout itself is.                                                            #
#                                                                             #
#  This program is free software; you can redistribute it and/or modify       #
#  it under the terms of the GNU General Public License as published by       #
#  the Free Software Foundation; either Version 3, or (at your option)        #
#  any later version.                                                         #
#                                                                             #
#  This program is distributed in the hope that it will be useful,            #
#  but WITHOUT ANY WARRANTY; without even the implied warranty of             #
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              #
#  GNU General Public License for more details.                               #
#                                                                             #
#  You should have received a copy of the GNU General Public License          #
#  along with this program; if not, write to the Free Software                #
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston MA 02111-1307 USA     #
#                                                                             #
#  As a special exception, when this file is read by Lout when processing     #
#  a Lout source document, you may use the result without restriction.        #
#                                                                             #
###############################################################################

export @Python
def @PythonSetup
    named pipe			{	}  # pipe through this first
    named numbered		{ No	}  # want lines numbered?
    named blanknumbered		{ Yes	}  # blank lines numbered?
    named style
	named @OrIfPlain left x right y
	{ @BackEnd @Case { PlainText @Yield y else @Yield x } }
				{ varying @OrIfPlain fixed }  # print style

    # the following options apply when style is "fixed"
    named fixedfont				{ Courier }# font family
    named fixedsize				{ -1.0p	}  # font size
    named fixedline				{ 1.0vx	}  # line-space
    named fixedblanklinescale			{ 1.0	}  # blank-line scale
    named fixedspace				{ lout	}  # spacing mode
    named fixedtabin				{ 8	}  # tab interval
    named fixedtabout				{ 8s	}  # tab width

    named fixedidentifiers			{ Base	}  # identifier face
    named fixedkeywords				{ Base	}  # keyword face
    named fixedoperators			{ Base	}  # operator face
    named fixednumbers				{ Base	}  # number face
    named fixedstrings				{ Base	}  # string face
    named fixedcomments				{ Base	}  # comment face
    named fixedlinenumbers			{ Base	}  # line numbers face

    named fixedidentifiersformat right @Body	{ @Body	}  # identifier format
    named fixedkeywordsformat right @Body	{ @Body	}  # keyword format
    named fixedoperatorsformat right @Body	{ @Body	}  # operators format
    named fixednumbersformat right @Body	{ @Body	}  # number format
    named fixedstringsformat right @Body	{ @Body	}  # string format
    named fixedcommentsformat right @Body	{ @Body	}  # comment format
    named fixedlinenumbersformat right @Body	{ @Body	}  # line nums format

    # the following options apply when style is "varying"
    named varyingfont				{	}  # font family
    named varyingsize				{ 1.0f	}  # font size
    named varyingline				{ 1.0vx	}  # line-space
    named varyingblanklinescale			{ 1.0	}  # blank-line scale
    named varyingspace				{ lout	}  # spacing mode
    named varyingtabin				{ 8	}  # tab interval
    named varyingtabout				{ 3f	}  # tab width

    named varyingidentifiers			{ Slope	}  # identifier face
    named varyingkeywords			{ Bold	}  # keyword face
    named varyingoperators			{ Base	}  # operator face
    named varyingnumbers			{ Base	}  # number face
    named varyingstrings			{ Slope	}  # string face
    named varyingcomments			{ Base	}  # comment face
    named varyinglinenumbers			{ Base	}  # line numbers face

    named varyingidentifiersformat right @Body	{ @Body	}  # identifier format
    named varyingkeywordsformat right @Body	{ @Body	}  # keyword format
    named varyingoperatorsformat right @Body	{ @Body	}  # operators format
    named varyingnumbersformat right @Body	{ @Body	}  # number format
    named varyingstringsformat right @Body	{ @Body	}  # string format
    named varyingcommentsformat right @Body	{ @Body	}  # comment format
    named varyinglinenumbersformat right @Body	{ @Body	}  # line nums format

    # the following options apply when style is "symbol"
    named symbolfont				{	}  # font family
    named symbolsize				{ 1.0f	}  # font size
    named symbolline				{ 1.0vx	}  # line-space
    named symbolblanklinescale			{ 1.0	}  # blank-line scale
    named symbolspace				{ lout	}  # spacing mode
    named symboltabin				{ 8	}  # tab interval
    named symboltabout				{ 3f	}  # tab width

    named symbolidentifiers			{ Slope	}  # identifier face
    named symbolkeywords			{ Bold	}  # keyword face
    named symboloperators			{ Base	}  # operator face
    named symbolnumbers				{ Base	}  # number face
    named symbolstrings				{ Slope	}  # string face
    named symbolcomments			{ Base	}  # comment face
    named symbollinenumbers			{ Base	}  # line numbers face

    named symbolidentifiersformat right @Body	{ @Body	}  # identifier format
    named symbolkeywordsformat right @Body	{ @Body	}  # keyword format
    named symboloperatorsformat right @Body	{ @Body	}  # operators format
    named symbolnumbersformat right @Body	{ @Body	}  # number format
    named symbolstringsformat right @Body	{ @Body	}  # string format
    named symbolcommentsformat right @Body	{ @Body	}  # comment format
    named symbollinenumbersformat right @Body	{ @Body	}  # line nums format

@Begin

    export
    
	@PI @PK @PO @PN @PS @PC @PL @PA @PM @PD
	@A "$>" "''"

    def @Python
	named style          { style         }  # style
	named numbered	     { numbered	     }  # want numbered lines?
	named blanknumbered  { blanknumbered }  # numbered blank lines?
	named pipe           { pipe          }  # pipe through this first
	named font           { dft           }  # font family
	named size           { dft           }  # font size
	named line           { dft           }  # line-space
	named blanklinescale { dft           }  # blank-line scale
	named space          { dft           }  # spacing mode
	named tabin          { dft           }  # tab interval
	named tabout         { dft           }  # tab width
	named identifiers    { dft           }  # ident. font
	named keywords       { dft           }  # keyword font
	named operators      { dft           }  # operator font
	named numbers        { dft           }  # number font
	named strings        { dft           }  # string font
	named comments       { dft           }  # comment font
	named linenumbers    { dft           }  # line numbers font
	body @Body			        # filtered, see below
    @Begin

	def @Test	# returns x unless x is dft
	    left x
	    named iffixed {}
	    named ifvarying {}
	    named ifsymbol {}
	{
	    x @Case {
		dft @Yield {
		    style @Case {
			fixed   @Yield { iffixed   }
			varying @Yield { ifvarying }
			symbol  @Yield { ifsymbol  }
		    }
		}
		else @Yield x
	    }
	}


	def @Else	# returns x, or y if x is dft
	    left x
	    right y
	{
	    x @Case {
		dft  @Yield y
		else @Yield x
	    }
	}


	def @InitTab
	{
	  tabin @Test
	      iffixed   { fixedtabin   }
	      ifvarying { varyingtabin }
	      ifsymbol  { symboltabin  }
	}


	def @InitTabWidth
	{
	  tabout @Test
	      iffixed   { fixedtabout   }
	      ifvarying { varyingtabout }
	      ifsymbol  { symboltabout  }
	}


	def @Filter
	{
	    def wantnumbered
	    {
		numbered @Case {
		  { No no }	@Yield ""
		  { Yes yes }	@Yield "-L"
		  else          @Yield { "-L"numbered }
		}
	    }

	    def wantblanknumbered
	    {
	        blanknumbered @Case {
		  { No no }		@Yield "-M"
		  { NoPrint noprint }	@Yield "-N"
		  { Yes yes }		@Yield ""
		}
	    }

	    pipe @Case {
		"" @Yield {
	    	    "prg2lout -r -lPython" wantblanknumbered wantnumbered
		    -i{@FilterIn} -o{@FilterOut} -e{@FilterErr}
		    -t{@InitTab} -T{@InitTabWidth}
		}
		else @Yield {
	    	    "cat" @FilterIn "|" pipe "|"
		    "prg2lout -r -lPython" wantblanknumbered wantnumbered
		    -o{@FilterOut} -e{@FilterErr}
		    -t{@InitTab} -T{@InitTabWidth}
		}
	    }
	}


	def @InitFontFamily
	{
	  font @Test
	      iffixed   { fixedfont   }
	      ifvarying { varyingfont }
	      ifsymbol  { symbolfont  }
	}


	def @InitSize
	{
	  size @Test
	      iffixed   { fixedsize   }
	      ifvarying { varyingsize }
	      ifsymbol  { symbolsize  }
	}


	def @InitLine
	{
	  line @Test
	      iffixed   { fixedline   }
	      ifvarying { varyingline }
	      ifsymbol  { symbolline  }
	}


	def @InitBLS
	{
	  blanklinescale @Test
	      iffixed   { fixedblanklinescale   }
	      ifvarying { varyingblanklinescale }
	      ifsymbol  { symbolblanklinescale  }
	}


	def @InitSpace
	{
	  space @Test
	      iffixed   { fixedspace   }
	      ifvarying { varyingspace }
	      ifsymbol  { symbolspace  }
	}


	def @PI		# for formatting identifiers
	    right x
	{
	    style @Case {
		fixed @Yield fixedidentifiersformat {
		    { identifiers @Else fixedidentifiers } @Font x
		}
		varying @Yield varyingidentifiersformat {
		    { identifiers @Else varyingidentifiers } @Font x
		}
		symbol @Yield symbolidentifiersformat {
		    { identifiers @Else symbolidentifiers } @Font x
		}
	    }
	}


	def @PK		# for formatting keywords
	    right x
	{
	    style @Case {
		fixed @Yield fixedkeywordsformat {
		    { keywords @Else fixedkeywords } @Font x
		}
		varying @Yield varyingkeywordsformat {
		    { keywords @Else varyingkeywords } @Font x
		}
		symbol @Yield symbolkeywordsformat {
		    { keywords @Else symbolkeywords } @Font x
		}
	    }
	}


	def @PO		# for formatting operators
	    right x
	{
	    style @Case {
		fixed @Yield fixedoperatorsformat {
		    { operators @Else fixedoperators } @Font x
		}
		varying @Yield varyingoperatorsformat {
		    { operators @Else varyingoperators } @Font x
		}
		symbol @Yield symboloperatorsformat {
		    { operators @Else symboloperators } @Font x
		}
	    }
	}


	def @PN		# for formatting numbers
	    right x
	{
	    style @Case {
		fixed @Yield fixednumbersformat {
		    { numbers @Else fixednumbers } @Font x
		}
		varying @Yield varyingnumbersformat {
		    { numbers @Else varyingnumbers } @Font x
		}
		symbol @Yield symbolnumbersformat {
		    { numbers @Else symbolnumbers } @Font x
		}
	    }
	}


	export "'''"
	def @PS		# for formatting strings
	    body x
	{
	    def "'''" { "'''" }

	    style @Case {
		fixed @Yield fixedstringsformat {
		    { strings @Else fixedstrings } @Font x
		}
		varying @Yield varyingstringsformat {
		    { strings @Else varyingstrings } @Font x
		}
		symbol @Yield symbolstringsformat {
		    { strings @Else symbolstrings } @Font x
		}
	    }
	}


	def @PC		# for formatting comments
	    right x
	{
	    style @Case {
		fixed @Yield fixedcommentsformat {
		    { comments @Else fixedcomments } @Font x
		}
		varying @Yield varyingcommentsformat {
		    { comments @Else varyingcomments } @Font x
		}
		symbol @Yield symbolcommentsformat {
		    { comments @Else symbolcomments } @Font x
		}
	    }
	}


	def @PL		# for formatting line numbers
	    right x
	{
	    style @Case {
		fixed @Yield fixedlinenumbersformat {
		    { linenumbers @Else fixedlinenumbers } @Font x
		}
		varying @Yield varyinglinenumbersformat {
		    { linenumbers @Else varyinglinenumbers } @Font x
		}
		symbol @Yield symbollinenumbersformat {
		    { linenumbers @Else symbollinenumbers } @Font x
		}
	    }
	}


	def @PA		# for formatting asterisks
	{
	    @PO @BackEnd @Case {
		PlainText @Yield "*"
		else @Yield { "0.5w" @VShift "*" }
	    }
	}


	def @PM		# for formatting minus signs
	{
	    @PO @BackEnd @Case {
		PlainText @Yield "-"
		else @Yield style @Case {
		    fixed   @Yield "-"
		    else    @Yield { { Symbol Base } @Font @Char "minus" }
		}
	    }
	}


	def @PD		# for formatting dots, if wanted larger
	{
	    @PO @BackEnd @Case {
		PlainText @Yield "."
		else @Yield { "1.4f" @Font "+0.04f" @VShift "." &"0.05f" }
	    }
	}


	def @A		# get characters from the Adobe Symbol font
	    named sym {}
	    right x
	{
	    style @Case {
		symbol	@Yield { { Symbol Base } @Font @Char sym }
		else	@Yield { x			}
	    }
	}


	macro "$>" { {} & }

        def "''" { "''" }

	Programming @Language
	{ @InitFontFamily Base @InitSize } @Font @InitSpace @Space
	{ @InitLine lines "blanklinescale" @InitBLS } @Break @Body

    @End @Python

@End @PythonSetup