#--------------------------------------------------------------------
# Copyright (c) 1999-2004, International Business Machines
# Corporation and others. All Rights Reserved.
#--------------------------------------------------------------------

# Rules are predicated on running NFD first, and NFC afterwards
# :: [\u0000-\u007F \u0370-\u03FF [:Greek:] [:nonspacing mark:]] ;
# MINIMAL FILTER GENERATED FOR: Greek-Latin
:: [;\u00B5\u00B7\u00C4\u00CB\u00CF\u00D6\u00DC\u00E4\u00EB\u00EF\u00F6\u00FC\u00FF-\u0101\u0112-\u0113\u012A-\u012B\u014C-\u014D\u016A-\u016B\u0178\u01D5-\u01DC\u01DE-\u01E3\u01EC-\u01ED\u022A-\u022D\u0230-\u0233\u0304\u0308\u0313-\u0314\u0342-\u0345\u037A\u037E\u0386-\u038A\u038C\u038E-\u03A1\u03A3-\u03CE\u03D0-\u03D7\u03DB\u03DD\u03DF\u03E1\u03E3\u03E5\u03E7\u03E9\u03EB\u03ED\u03EF-\u03F5\u03F7-\u07FB\u0401\u0407\u0451\u0457\u04D2-\u04D3\u04DA-\u04DF\u04E2-\u04E7\u04EA-\u04F1\u04F4-\u04F5\u04F8-\u04F9\u1E14-\u1E17\u1E20-\u1E21\u1E26-\u1E27\u1E2E-\u1E2F\u1E38-\u1E39\u1E4E-\u1E53\u1E5C-\u1E5D\u1E7A-\u1E7B\u1E84-\u1E85\u1E8C-\u1E8D\u1E97\u1F00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC1-\u1FC4\u1FC6-\u1FCC\u1FCF-\u1FD3\u1FD6-\u1FDB\u1FDF-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2126\u03F9] ;

:: NFD (NFC) ; 

# TEST CASES

# Ὀλίγοι ἔμφονες πολλῶν ἀφρόνων φοβερώτεροι — Πλάτωνος
# ᾂ ᾒ ᾢ ᾃ ᾓ ᾣ
# ᾳ ῃ ῳ ὃ ὄ
# ὠς ὡς ὢς ὣς
# Ὠς Ὡς Ὢς Ὣς
# ὨΣ ὩΣ ὪΣ ὫΣ
# Ạ, ạ, Ẹ, ẹ, Ọ, ọ

# Useful variables

$lower = [[:latin:][:greek:] & [:Ll:]]; 
$glower = [[:greek:] & [:Ll:]]; 
$upper = [[:latin:][:greek:] & [:Lu:]] ; 
$accent = [:M:] ;

# NOTE: restrict to just the Greek & Latin accents that we care about
# TODO: broaden out once interation is fixed
$accentMinus = [ [\u0300-\u0345] & [:M:] - [\u0338]] ;

$macron = \u0304 ;
$ddot = \u0308 ;
$ddotmac = [$ddot$macron];

$lcgvowel = [αεηιουω] ; 
$ucgvowel = [ΑΕΗΙΟΥΩ] ; 
$gvowel = [$lcgvowel $ucgvowel] ; 
$lcgvowelC = [$lcgvowel $accent] ; 

$evowel = [aeiouyAEIOUY];
$evowel2 = [iuyIUY];
$vowel = [ $evowel $gvowel] ; 

$gammaLike = [ΓΚΞΧγκξχϰ] ; 
$egammaLike = [GKXCgkxc] ; 
$smooth = ̓ ; 
$rough = ̔ ; 
$iotasub = ͅ ; 

$evowel_i = [$evowel-[iI]] ;
$evowel2_i = [uyUY];

$underbar = \u0331;

$afterLetter = [:L:] [[:M:]\']* ;
$beforeLetter = [[:M:]\']* [:L:] ;
$beforeLower = $accent * $lower ; 

$notLetter = [^[:L:][:M:]] ;
$under = ̱;

# Fix punctuation
# preserve original
\: <> \: $under ;
\? <> \? $under ;

\; <> \? ;
· <> \: ;

# CIRCUMFLEX: convert greek circumflex to normal one. Could use tilde or inverted breve

\u0342 <> \u0302 ; 

# IOTA: convert iota subscript to iota
# first make previous alpha long!

$accent_minus = [[$accent]-[$iotasub$macron]];

Α } $accent_minus * $iotasub > | Α $macron ;  
α } $accent_minus * $iotasub > | α $macron ; 

# now convert to uppercase if after uppercase, ow to lowercase

$upper $accent * { $iotasub > I ; 
$iotasub > i ; 

| $1 $iotasub < ($evowel $macron $accentMinus *) i ;
| $1 $iotasub < ($evowel $macron $accentMinus *) I ;

# BREATHING

# Convert rough breathing to h, and move before letters.

# Make A ` x = > H a x

 Α ($macron?) $rough } $beforeLower > H | α $1; 
 Ε $rough } $beforeLower > H | ε; 
 Η $rough } $beforeLower > H | η ; 
 Ι ($ddot?) $rough } $beforeLower > H | ι  $1; 
 Ο $rough } $beforeLower > H | ο ; 
 Υ $rough } $beforeLower > H | υ ; 
 Ω ($ddot?) $rough } $beforeLower > H | ω $1; 

# Make A x ` = > H a x

Α ($glower $macron?) $rough > H | α $1 ; 
Ε ($glower) $rough > H | ε $1 ; 
Η ($glower) $rough > H | η $1 ; 
Ι ($glower $ddot?) $rough > H | ι $1 ; 
Ο ($glower) $rough > H | ο $1 ; 
Υ ($glower) $rough > H | υ $1 ; 
Ω ($glower  $ddot?) $rough > H | ω $1 ; 

#Otherwise, make x ` into h x and X ` into H X

($lcgvowel + $ddotmac? ) $rough > h | $1 ; 
($gvowel + $ddotmac? ) $rough > H | $1 ; 

# Go backwards with H

| $1 $rough < h ($evowel $macron $ddot? $evowel2_i $macron?) ;
| $1 $rough < h ($evowel $ddot? $evowel2 $macron?) ;
| $1 $rough < h ($evowel $macron? $ddot?) ;

| $1 $rough < H ([AEIOUY] $macron $ddot? $evowel2_i $macron?) ;
| $1 $rough < H ([AEIOUY] $ddot? $evowel2 $macron?) ;
| $1 $rough < H ([AEIOUY] $macron? $ddot?) ;

# titlecase, have to fix individually
# in the future, we should add &uppercase() to make this easier

| A $1 $rough < H a ($macron  $ddot? $evowel2_i $macron?) ;
| E $1 $rough < H e ($macron  $ddot? $evowel2_i $macron?) ;
| I $1 $rough < H i ($macron  $ddot? $evowel2_i $macron?) ;
| O $1 $rough < H o ($macron  $ddot? $evowel2_i $macron?) ;
| U $1 $rough < H u ($macron $ddot? $evowel2_i $macron?) ;
| Y $1 $rough < H y ($macron $ddot? $evowel2_i $macron?) ;

| A $1 $rough < H a ($ddot? $evowel2 $macron?) ;
| E $1 $rough < H e ($ddot? $evowel2 $macron?) ;
| I $1 $rough < H i ($ddot? $evowel2 $macron?) ;
| O $1 $rough < H o ($ddot? $evowel2 $macron?) ;
| U $1 $rough < H u ($ddot? $evowel2 $macron?) ;
| Y $1 $rough < H y ($ddot? $evowel2 $macron?) ;

| A $1 $rough < H a ($macron? $ddot? ) ;
| E $1 $rough < H e ($macron? $ddot? ) ;
| I $1 $rough < H i ($macron? $ddot? ) ;
| O $1 $rough < H o ($macron? $ddot? ) ;
| U $1 $rough < H u ($macron? $ddot? ) ;
| Y $1 $rough < H y ($macron? $ddot? ) ;

# Now do smooth

#delete smooth breathing for Latin
$smooth > ; 

# insert in Greek
# the assumption is that all Marks are on letters.

 | $1 $smooth < $notLetter { ([rR]) } [^hH$smooth$rough] ;
 | $1 $smooth < $notLetter { ($evowel $macron? $evowel2 $macron?) } [^$smooth$rough] ;
 | $1 $smooth < $notLetter { ($evowel $macron?) } [^$evowel2$smooth$rough] ;

# TODO: preserve smooth/rough breathing if not 
# on initial vowel sequence

# need to have these up here so the rules don't mask

# remove now superfluous macron when returning

Α < A $macron ;  
α < a $macron ; 

η <> e $macron ;
Η <> E $macron ;

φ <> ph ; 
Ψ } $beforeLower <> Ps ; 
Ψ <> PS ; 

Φ } $beforeLower <> Ph ; 
Φ <> PH ;
ψ <> ps ; 

ω <> o $macron ;
Ω <>  O $macron;

# NORMAL

α <> a ; 
Α <> A ; 

β <> b ; 
Β <> B ; 

γ } $gammaLike <> n } $egammaLike ; 
γ <> g ; 
Γ } $gammaLike <> N } $egammaLike ; 
Γ <> G ; 

δ <> d ; 
Δ <> D ; 

ε <> e ; 
Ε <> E ; 

ζ <> z ; 
Ζ <> Z ; 

θ <> th ; 
Θ } $beforeLower <> Th ; 
Θ <> TH ; 

ι <> i ; 
Ι <> I ; 

κ <> k ;
Κ <> K ; 

λ <> l ; 
Λ <> L ; 

μ <> m ; 
Μ <> M ; 

ν } $gammaLike > n\' ; 
ν <> n ; 
Ν } $gammaLike <> N\' ; 
Ν <> N ; 

ξ <> x ; 
Ξ <> X ; 

ο <> o ; 
Ο <> O ; 

π <> p ; 
Π <> P ; 

ρ $rough <> rh; 
Ρ $rough } $beforeLower <> Rh ; 
Ρ $rough <> RH ; 
ρ <> r ; 
Ρ <> R ; 

# insert separator before things that turn into s

[Pp] { } [ςσΣϷϸϺϻ] > \' ; 

# special S variants

Ϸ <> Š ; # Ϸ GREEK CAPITAL LETTER SHO Uppercase_Letter Grek - L 
ϸ <> š ; #ϸ GREEK SMALL LETTER SHO Lowercase_Letter Grek - L 
Ϻ <> Ŝ ; # Ϻ GREEK CAPITAL LETTER SAN Uppercase_Letter Grek - L 
ϻ <> ŝ ; # ϻ GREEK SMALL LETTER SAN Lowercase_Letter Grek - L 

# underbar means exception

# before a letter, initial
ς } $beforeLetter <> s $underbar } $beforeLetter;
σ } $beforeLetter <> s } $beforeLetter;

# otherwise, after a letter = final 
$afterLetter { σ <> $afterLetter { s $underbar;
$afterLetter { ς <> $afterLetter { s ;

# otherwise (isolated) = initial
ς <> s $underbar;
σ <> s ;

# [Pp] { Σ <> \'S ; 
Σ <> S ; 

τ <> t ; 
Τ <> T ; 

$vowel {υ } <> u ; 
υ <> y ; 
$vowel { Υ <> U ; 
Υ <> Y ; 

χ <> ch ; 
Χ } $beforeLower <> Ch ; 
Χ <> CH ; 

# Completeness for ASCII

$ignore = [[:Mark:]''] * ;

| k  < c ;
| ph < f ;
| i  < j ;
| k < q ;
| b < v } $vowel ;
| b < w } $vowel;
| u < v ;
| u < w;
| K < C ;
| Ph < F ;
| I < J ;
| K < Q ;
| B < V  } $vowel ;
| B < W  } $vowel ;
| U < V ;
| U < W ;

$rough } $ignore [:UppercaseLetter:] > H ;
$ignore [:UppercaseLetter:] { $rough > H ;
$rough < H ;
$rough <> h ;

# Completeness for Greek

ϐ > | β ;
ϑ > | θ ;
ϒ > | Υ ;
ϕ > | φ ;
ϖ > | π ;

ϰ > | κ ;
ϱ > | ρ ;
ϲ > | σ ;
Ϲ > | Σ; #U+03F9 GREEK CAPITAL LUNATE SIGMA SYMBOL
ϳ > j ;
ϴ > | Θ ;
ϵ > | ε ;

µ > | μ ;

 ͺ > i;

# delete any trailing ' marks used for roundtripping

 < [Ππ] { \' } [Ss] ;
 < [Νν] { \' } $egammaLike ;

::NFC (NFD) ;
# ([\u0000-\u007F [:Latin:] [:Greek:] [:nonspacing mark:]]) ;
# ([\u0000-\u007F \u00B7 [:Latin:] [:nonspacing mark:]]) ;
# MINIMAL FILTER GENERATED FOR: Latin-Greek BACKWARD
:: ( [':?A-Za-z\u00C0-\u00C5\u00C7-\u00CF\u00D1-\u00D6\u00D9-\u00DD\u00E0-\u00E5\u00E7-\u00EF\u00F1-\u00F6\u00F9-\u00FD\u00FF-\u010F\u0112-\u0125\u0128-\u0130\u0134-\u0137\u0139-\u013E\u0143-\u0148\u014C-\u0151\u0154-\u0165\u0168-\u017E\u01A0-\u01A1\u01AF-\u01B0\u01CD-\u01DC\u01DE-\u01E3\u01E6-\u01F0\u01F4-\u01F5\u01F8-\u021B\u021E-\u021F\u0226-\u0233\u0300-\u0337\u0339-\u0345\u0385-\u0386\u0388-\u038A\u038C\u038E-\u0390\u03AA-\u03B0\u03CA-\u03CE\u03D3-\u03D4\u0400-\u0401\u0403\u0407\u040C-\u040E\u0419\u0439\u0450-\u0451\u0453\u0457\u045C-\u045E\u0476-\u0477\u04C1-\u04C2\u04D0-\u04D3\u04D6-\u04D7\u04DA-\u04DF\u04E2-\u04E7\u04EA-\u04F5\u04F8-\u04F9\u1E00-\u1E99\u1E9B\u1EA0-\u1EF9\u1F00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FC1-\u1FC4\u1FC6-\u1FD3\u1FD6-\u1FDB\u1FDD-\u1FEE\u1FF2-\u1FF4\u1FF6-\u1FFC\u212A-\u212B] ) ;