##############################################################################
# man2html2.tcl --
#
# This file defines procedures that are used during the second pass of the man
# page to html conversion process. It is sourced by man2html.tcl.
#
# Copyright (c) 1996 by Sun Microsystems, Inc.
#
# $Id: man2html2.tcl,v 1.10 2007/10/17 17:33:51 dkf Exp $
#

package require Tcl 8.4

# Global variables used by these scripts:
#
# NAME_file -	array indexed by NAME and containing file names used for
#		hyperlinks.
#
# textState -	state variable defining action of 'text' proc.
#
# nestStk -	stack oriented list containing currently active HTML tags (UL,
#		OL, DL). Local to 'nest' proc.
#
# inDT -	set by 'TPmacro', cleared by 'newline'. Used to insert the
#		tag while in a dictionary list <DL>.
#
# curFont -	Name of special font that is currently in use. Null means the
#		default paragraph font is being used.
#
# file -	Where to output the generated HTML.
#
# fontStart -	Array to map font names to starting sequences.
#
# fontEnd -	Array to map font names to ending sequences.
#
# noFillCount -	Non-zero means don't fill the next $noFillCount lines: force a
#		line break at each newline. Zero means filling is enabled, so
#		don't output line breaks for each newline.
#
# footer -	info inserted at bottom of each page. Normally read from the
#		xref.tcl file

##############################################################################
# initGlobals --
#
# This procedure is invoked to set the initial values of all of the global
# variables, before processing a man page.
#
# Arguments:
# None.

proc initGlobals {} {
    global file noFillCount textState
    global fontStart fontEnd curFont inPRE charCnt inTable

    nest init
    set inPRE 0
    set inTable 0
    set textState 0
    set curFont ""
    set fontStart(Code) "<B>"
    set fontStart(Emphasis) "<I>"
    set fontEnd(Code) "</B>"
    set fontEnd(Emphasis) "</I>"
    set noFillCount 0
    set charCnt 0
    setTabs 0.5i
}

##############################################################################
# beginFont --
#
# Arranges for future text to use a special font, rather than the default
# paragraph font.
#
# Arguments:
# font -		Name of new font to use.

proc beginFont font {
    global curFont file fontStart

    if {$curFont eq $font} {
	return
    }
    endFont
    puts -nonewline $file $fontStart($font)
    set curFont $font
}

##############################################################################
# endFont --
#
# Reverts to the default font for the paragraph type.
#
# Arguments:
# None.

proc endFont {} {
    global curFont file fontEnd

    if {$curFont ne ""} {
	puts -nonewline $file $fontEnd($curFont)
	set curFont ""
    }
}

##############################################################################
# text --
#
# This procedure adds text to the current paragraph. If this is the first text
# in the paragraph then header information for the paragraph is output before
# the text.
#
# Arguments:
# string -		Text to output in the paragraph.

proc text string {
    global file textState inDT charCnt inTable

    set pos [string first "\t" $string]
    if {$pos >= 0} {
    	text [string range $string 0 [expr $pos-1]]
    	tab
    	text [string range $string [expr $pos+1] end]
	return
    }
    if {$inTable} {
	if {$inTable == 1} {
	    puts -nonewline $file <TR>
	    set inTable 2
	}
	puts -nonewline $file <TD>
    }
    incr charCnt [string length $string]
    regsub -all {&} $string {\&amp;}  string
    regsub -all {<} $string {\&lt;}  string
    regsub -all {>} $string {\&gt;}  string
    regsub -all \"  $string {\&quot;}  string
    switch -exact -- $textState {
	REF {
	    if {$inDT eq ""} {
		set string [insertRef $string]
	    }
	}
	SEE {
	    global NAME_file
	    foreach i [split $string] {
		if {![regexp -nocase {^[a-z_]+} [string trim $i] i]} {
# 		    puts "Warning: $i in SEE ALSO not found"
		    continue
		}
		if {![catch { set ref $NAME_file($i) }]} {
		    regsub $i $string "<A HREF=\"$ref.html\">$i</A>" string
		}
	    }
	}
    }
    puts -nonewline $file "$string"
    if {$inTable} {
	puts -nonewline $file </TD>
    }
}

##############################################################################
# insertRef --
#
# Arguments:
# string -		Text to output in the paragraph.

proc insertRef string {
    global NAME_file self
    set path {}
    if {![catch { set ref $NAME_file([string trim $string]) }]} {
	if {"$ref.html" ne $self} {
	    set string "<A HREF=\"${path}$ref.html\">$string</A>"
#	    puts "insertRef: $self $ref.html ---$string--"
	}
    }
    return $string
}

##############################################################################
# macro --
#
# This procedure is invoked to process macro invocations that start with "."
# (instead of ').
#
# Arguments:
# name -		The name of the macro (without the ".").
# args -		Any additional arguments to the macro.

proc macro {name args} {
    switch $name {
	AP {
	    if {[llength $args] != 3} {
		puts stderr "Bad .AP macro: .$name [join $args " "]"
	    }
	    setTabs {1.25i 2.5i 3.75i}
	    TPmacro {}
	    font B
	    text "[lindex $args 0]  "
	    font I
	    text "[lindex $args 1]"
	    font R
	    text " ([lindex $args 2])"
	    newline
	}
	AS {}				;# next page and previous page
	br {
	    lineBreak
	}
	BS {}
	BE {}
	CE {
	    global file noFillCount inPRE
	    puts $file </PRE></BLOCKQUOTE>
	    set inPRE 0
	}
	CS {				;# code section
	    global file noFillCount inPRE
	    puts -nonewline $file <BLOCKQUOTE><PRE>
	    set inPRE 1
	}
	DE {
	    global file noFillCount inTable
	    puts $file </TABLE></BLOCKQUOTE>
	    set inTable 0
	    set noFillCount 0
	}
	DS {
	    global file noFillCount inTable
	    puts -nonewline $file {<BLOCKQUOTE><TABLE BORDER="0">}
	    set noFillCount 10000000
	    set inTable 1
	}
	fi {
	    global noFillCount
	    set noFillCount 0
	}
	IP {
	    IPmacro $args
	}
	LP {
	    nest decr
	    nest incr
	    newPara
	}
	ne {
	}
	nf {
	    global noFillCount
	    set noFillCount 1000000
	}
	OP {
	    global inDT file inPRE
	    if {[llength $args] != 3} {
		puts stderr "Bad .OP macro: .$name [join $args " "]"
	    }
	    nest para DL DT
	    set inPRE 1
	    puts -nonewline $file <PRE>
	    setTabs 4c
	    text "Command-Line Name:"
	    tab
	    font B
	    set x [lindex $args 0]
	    regsub -all {\\-} $x - x
	    text $x
	    newline
	    font R
	    text "Database Name:"
	    tab
	    font B
	    text [lindex $args 1]
	    newline
	    font R
	    text "Database Class:"
	    tab
	    font B
	    text [lindex $args 2]
	    font R
	    puts -nonewline $file </PRE>
	    set inDT "\n<DD>"			;# next newline writes inDT
	    set inPRE 0
	    newline
	}
	PP {
	    nest decr
	    nest incr
	    newPara
	}
	RE {
	    nest decr
	}
	RS {
	    nest incr
	}
	SE {
	    global noFillCount textState inPRE file

	    font R
	    puts -nonewline $file </PRE>
	    set inPRE 0
	    set noFillCount 0
	    nest reset
	    newPara
	    text "See the "
	    font B
	    set temp $textState
	    set textState REF
	    text options
	    set textState $temp
	    font R
	    text " manual entry for detailed descriptions of the above options."
	}
	SH {
	    SHmacro $args
	}
	SS {
	    SHmacro $args subsection
	}
	SO {
	    global noFillCount inPRE file

	    SHmacro "STANDARD OPTIONS"
	    setTabs {4c 8c 12c}
	    set noFillCount 1000000
	    puts -nonewline $file <PRE>
	    set inPRE 1
	    font B
	}
	so {
	    if {$args ne "man.macros"} {
		puts stderr "Unknown macro: .$name [join $args " "]"
	    }
	}
	sp {					;# needs work
	    if {$args eq ""} {
		set count 1
	    } else {
		set count [lindex $args 0]
	    }
	    while {$count > 0} {
		lineBreak
		incr count -1
	    }
	}
	ta {
	    setTabs $args
	}
	TH {
	    THmacro $args
	}
	TP {
	    TPmacro $args
	}
	UL {					;# underline
	    global file
	    puts -nonewline $file "<B><U>"
	    text [lindex $args 0]
	    puts -nonewline $file "</U></B>"
	    if {[llength $args] == 2} {
		text [lindex $args 1]
	    }
	}
	VE {
#	    global file
#	    puts -nonewline $file "</FONT>"
	}
	VS {
#	    global file
#	    if {[llength $args] > 0} {
#		puts -nonewline $file "<BR>"
#	    }
#	    puts -nonewline $file "<FONT COLOR=\"GREEN\">"
	}
	default {
	    puts stderr "Unknown macro: .$name [join $args " "]"
	}
    }

#	global nestStk; puts "$name [format "%-20s" $args] $nestStk"
#	flush stdout; flush stderr
}

##############################################################################
# font --
#
# This procedure is invoked to handle font changes in the text being output.
#
# Arguments:
# type -		Type of font: R, I, B, or S.

proc font type {
    global textState
    switch $type {
	P -
	R {
	    endFont
	    if {$textState eq "REF"} {
		set textState INSERT
	    }
	}
	B {
	    beginFont Code
	    if {$textState eq "INSERT"} {
		set textState REF
	    }
	}
	I {
	    beginFont Emphasis
	}
	S {
	}
	default {
	    puts stderr "Unknown font: $type"
	}
    }
}

##############################################################################
# formattedText --
#
# Insert a text string that may also have \fB-style font changes and a few
# other backslash sequences in it.
#
# Arguments:
# text -		Text to insert.

proc formattedText text {
#	puts "formattedText: $text"
    while {$text ne ""} {
	set index [string first \\ $text]
	if {$index < 0} {
	    text $text
	    return
	}
	text [string range $text 0 [expr $index-1]]
	set c [string index $text [expr $index+1]]
	switch -- $c {
	    f {
		font [string index $text [expr $index+2]]
		set text [string range $text [expr $index+3] end]
	    }
	    e {
		text \\
		set text [string range $text [expr $index+2] end]
	    }
	    - {
		dash
		set text [string range $text [expr $index+2] end]
	    }
	    | {
		set text [string range $text [expr $index+2] end]
	    }
	    default {
		puts stderr "Unknown sequence: \\$c"
		set text [string range $text [expr $index+2] end]
	    }
	}
    }
}

##############################################################################
# dash --
#
# This procedure is invoked to handle dash characters ("\-" in troff). It
# outputs a special dash character.
#
# Arguments:
# None.

proc dash {} {
    global textState charCnt
    if {$textState eq "NAME"} {
    	set textState 0
    }
    incr charCnt
    text "-"
}

##############################################################################
# tab --
#
# This procedure is invoked to handle tabs in the troff input.
#
# Arguments:
# None.

proc tab {} {
    global inPRE charCnt tabString file
#	? charCnt
    if {$inPRE == 1} {
	set pos [expr $charCnt % [string length $tabString] ]
	set spaces [string first "1" [string range $tabString $pos end] ]
	text [format "%*s" [incr spaces] " "]
    } else {
#	puts "tab: found tab outside of <PRE> block"
    }
}

##############################################################################
# setTabs --
#
# This procedure handles the ".ta" macro, which sets tab stops.
#
# Arguments:
# tabList -	List of tab stops, each consisting of a number
#			followed by "i" (inch) or "c" (cm).

proc setTabs {tabList} {
    global file breakPending tabString

    # puts "setTabs: --$tabList--"
    set last 0
    set tabString {}
    set charsPerInch 14.
    set numTabs [llength $tabList]
    foreach arg $tabList {
	if {[string match +* $arg]} {
	    set relative 1
	    set arg [string range $arg 1 end]
	} else {
	    set relative 0
	}
	# Always operate in relative mode for "measurement" mode
	if {[regexp {^\\w'(.*)'u$} $arg content]} {
	    set distance [string length $content]
	} else {
	    if {[scan $arg "%f%s" distance units] != 2} {
		puts stderr "bad distance \"$arg\""
		return 0
	    }
	    switch -- $units {
		c {
		    set distance [expr {$distance * $charsPerInch / 2.54}]
		}
		i {
		    set distance [expr {$distance * $charsPerInch}]
		}
		default {
		    puts stderr "bad units in distance \"$arg\""
		    continue
		}
	    }
	}
	# ? distance
	if {$relative} {
	    append tabString [format "%*s1" [expr {round($distance-1)}] " "]
	    set last [expr {$last + $distance}]
	} else {
	    append tabString [format "%*s1" [expr {round($distance-$last-1)}] " "]
	    set last $distance
	}
    }
    # puts "setTabs: --$tabString--"
}

##############################################################################
# lineBreak --
#
# Generates a line break in the HTML output.
#
# Arguments:
# None.

proc lineBreak {} {
    global file inPRE
    puts $file "<BR>"
}

##############################################################################
# newline --
#
# This procedure is invoked to handle newlines in the troff input. It outputs
# either a space character or a newline character, depending on fill mode.
#
# Arguments:
# None.

proc newline {} {
    global noFillCount file inDT inPRE charCnt inTable

    if {$inDT ne ""} {
    	puts $file "\n$inDT"
    	set inDT {}
    } elseif {$inTable} {
	if {$inTable > 1} {
	    puts $file </tr>
	    set inTable 1
	}
    } elseif {$noFillCount == 0 || $inPRE == 1} {
	puts $file {}
    } else {
	lineBreak
	incr noFillCount -1
    }
    set charCnt 0
}

##############################################################################
# char --
#
# This procedure is called to handle a special character.
#
# Arguments:
# name -		Special character named in troff \x or \(xx construct.

proc char name {
    global file charCnt

    incr charCnt
#	puts "char: $name"
    switch -exact $name {
	\\0 {					;#  \0
	    puts -nonewline $file " "
	}
	\\\\ {					;#  \
	    puts -nonewline $file "\\"
	}
	\\(+- { 				;#  +/-
	    puts -nonewline $file "&#177;"
	}
	\\% {}					;#  \%
	\\| {					;#  \|
	}
	default {
	    puts stderr "Unknown character: $name"
	}
    }
}

##############################################################################
# macro2 --
#
# This procedure handles macros that are invoked with a leading "'" character
# instead of space. Right now it just generates an error diagnostic.
#
# Arguments:
# name -		The name of the macro (without the ".").
# args -		Any additional arguments to the macro.

proc macro2 {name args} {
    puts stderr "Unknown macro: '$name [join $args " "]"
}

##############################################################################
# SHmacro --
#
# Subsection head; handles the .SH and .SS macros.
#
# Arguments:
# name -		Section name.
# style -		Type of section (optional)

proc SHmacro {argList {style section}} {
    global file noFillCount textState charCnt

    set args [join $argList " "]
    if {[llength $argList] < 1} {
	puts stderr "Bad .SH macro: .$name $args"
    }

    set noFillCount 0
    nest reset

    set tag H3
    if {$style eq "subsection"} {
	set tag H4
    }
    puts -nonewline $file "<$tag>"
    text $args
    puts $file "</$tag>"

#	? args textState

    # control what the text proc does with text

    switch $args {
	NAME {set textState NAME}
	DESCRIPTION {set textState INSERT}
	INTRODUCTION {set textState INSERT}
	"WIDGET-SPECIFIC OPTIONS" {set textState INSERT}
	"SEE ALSO" {set textState SEE}
	KEYWORDS {set textState 0}
    }
    set charCnt 0
}

##############################################################################
# IPmacro --
#
# This procedure is invoked to handle ".IP" macros, which may take any of the
# following forms:
#
# .IP [1]			Translate to a "1Step" paragraph.
# .IP [x] (x > 1)		Translate to a "Step" paragraph.
# .IP				Translate to a "Bullet" paragraph.
# .IP \(bu			Translate to a "Bullet" paragraph.
# .IP text count		Translate to a FirstBody paragraph with
#				special indent and tab stop based on "count",
#				and tab after "text".
#
# Arguments:
# argList -		List of arguments to the .IP macro.
#
# HTML limitations: 'count' in '.IP text count' is ignored.

proc IPmacro argList {
    global file

    setTabs 0.5i
    set length [llength $argList]
    if {$length == 0} {
    	nest para UL LI
	return
    }
    # Special case for alternative mechanism for declaring bullets
    if {[lindex $argList 0] eq "\\(bu"} {
	nest para UL LI
	return
    }
    if {[regexp {^\[\d+\]$} [lindex $argList 0]]} {
    	nest para OL LI
	return
    }
    nest para DL DT
    formattedText [lindex $argList 0]
    puts $file "\n<DD>"
    return
}

##############################################################################
# TPmacro --
#
# This procedure is invoked to handle ".TP" macros, which may take any of the
# following forms:
#
# .TP x		Translate to an indented paragraph with the specified indent
# 			(in 100 twip units).
# .TP		Translate to an indented paragraph with default indent.
#
# Arguments:
# argList -		List of arguments to the .IP macro.
#
# HTML limitations: 'x' in '.TP x' is ignored.

proc TPmacro {argList} {
    global inDT
    nest para DL DT
    set inDT "\n<DD>"			;# next newline writes inDT
    setTabs 0.5i
}

##############################################################################
# THmacro --
#
# This procedure handles the .TH macro. It generates the non-scrolling header
# section for a given man page, and enters information into the table of
# contents. The .TH macro has the following form:
#
# .TH name section date footer header
#
# Arguments:
# argList -		List of arguments to the .TH macro.

proc THmacro {argList} {
    global file

    if {[llength $argList] != 5} {
	set args [join $argList " "]
	puts stderr "Bad .TH macro: .$name $args"
    }
    set name  [lindex $argList 0]		;# Tcl_UpVar
    set page  [lindex $argList 1]		;# 3
    set vers  [lindex $argList 2]		;# 7.4
    set lib   [lindex $argList 3]		;# Tcl
    set pname [lindex $argList 4]		;# {Tcl Library Procedures}

    puts -nonewline $file "<HTML><HEAD><TITLE>"
    text "$lib - $name ($page)"
    puts $file "</TITLE></HEAD><BODY>\n"

    puts -nonewline $file "<H1><CENTER>"
    text $pname
    puts $file "</CENTER></H1>\n"
}

##############################################################################
# newPara --
#
# This procedure sets the left and hanging indents for a line. Indents are
# specified in units of inches or centimeters, and are relative to the current
# nesting level and left margin.
#
# Arguments:
# None

proc newPara {} {
    global file nestStk

    if {[lindex $nestStk end] ne "NEW"} {
	nest decr
    }
    puts -nonewline $file "<P>"
}

##############################################################################
# nest --
#
# This procedure takes care of inserting the tags associated with the IP, TP,
# RS, RE, LP and PP macros. Only 'nest para' takes arguments.
#
# Arguments:
# op -				operation: para, incr, decr, reset, init
# listStart -		begin list tag: OL, UL, DL.
# listItem -		item tag:       LI, LI, DT.

proc nest {op {listStart "NEW"} {listItem ""} } {
    global file nestStk inDT charCnt
#	puts "nest: $op $listStart $listItem"
    switch $op {
	para {
	    set top [lindex $nestStk end]
	    if {$top eq "NEW"} {
		set nestStk [lreplace $nestStk end end $listStart]
		puts $file "<$listStart>"
	    } elseif {$top ne $listStart} {
		puts stderr "nest para: bad stack"
		exit 1
	    }
	    puts $file "\n<$listItem>"
	    set charCnt 0
	}
	incr {
	   lappend nestStk NEW
	}
	decr {
	    if {[llength $nestStk] == 0} {
		puts stderr "nest error: nest length is zero"
		set nestStk NEW
	    }
	    set tag [lindex $nestStk end]
	    if {$tag ne "NEW"} {
		puts $file "</$tag>"
	    }
	    set nestStk [lreplace $nestStk end end]
	}
	reset {
	    while {[llength $nestStk] > 0} {
		nest decr
	    }
	    set nestStk NEW
	}
	init {
	    set nestStk NEW
	    set inDT {}
	}
    }
    set charCnt 0
}

##############################################################################
# do --
#
# This is the toplevel procedure that translates a man page to HTML. It runs
# the man2tcl program to turn the man page into a script, then it evals that
# script.
#
# Arguments:
# fileName -		Name of the file to translate.

proc do fileName {
    global file self html_dir package footer
    set self "[file tail $fileName].html"
    set file [open "$html_dir/$package/$self" w]
    puts "  Pass 2 -- $fileName"
    flush stdout
    initGlobals
    if {[catch { eval [exec man2tcl [glob $fileName]] } msg]} {
	global errorInfo
	puts stderr $msg
	puts "in"
	puts stderr $errorInfo
	exit 1
    }
    nest reset
    puts $file $footer
    puts $file "</BODY></HTML>"
    close $file
}