# greek-fontenc.def

## Common Greek font encoding definitions

Copyright
  © 2013 Günter Milde
Licence

  This work may be distributed and/or modified under the conditions of the LaTeX Project Public License, either version 1.3 of this license or any later version.

Identification

      \ProvidesFile{greek-fontenc.def}
      [2014/12/12 v0.12 Common Greek font encoding definitions]

Abstract

This file provides definitions that are shared between font encodings providing Greek characters.

Changelog:

  0.9 | 2013-07-03 | code “outsourced” from lgrxenc.def
  0.9.1 | 2013-07-17 | composite definitions starting with standard accent cmds
  0.11 | 2013-11-28 | `\greekscript` TextCommand
  0.12 | 2014-12-12 | Remove symbol macros for breathing accents.

# Usage

This file is input by the font encoding definition files lgrenc.def. and greek-euenc.def.

# Implementation

## ensuregreek, greekscript

Provide “empty” encoding-specific definitions for `\ensuregreek` and `\greekscript`. The definitions in this file make the font encoding fit for use with the Greek script. (See `textalpha.sty` for default definitions.)

The `\ensuregreek` macro can be used to ensure that its argument is set in a font encoding with support for Greek. If the active font encoding supports it, kerning between adjacent command calls (e.g. `\ensuregreek{A}\ensuregreek{\Upsilon}`) is preserved. This allows, e.g., wrapping of compound Unicode character definitions.

    \ProvideTextCommand{\ensuregreek}{\LastDeclaredEncoding}[1]{#1}

The `\greekscript` declaration switches to a font encoding supporting the Greek script, if required. The following definition announces the `\LastDeclaredEncoding` as Greek-supporting:

    \ProvideTextCommand{\greekscript}{\LastDeclaredEncoding}{}

## Aliases

Aliases are defined via DeclareTextCommand so that up/downcasing works without the need for additional uclclist entries.

Compatibility aliases for hyperref’s puenc.def:

    \DeclareTextCommand{\textstigmagreek}{\LastDeclaredEncoding}{\textstigma}
    \DeclareTextCommand{\textkoppagreek}{\LastDeclaredEncoding}{\textkoppa}
    \DeclareTextCommand{\textStigmagreek}{\LastDeclaredEncoding}{\textStigma}
    \DeclareTextCommand{\textSampigreek}{\LastDeclaredEncoding}{\textSampi}
    \DeclareTextCommand{\textsampigreek}{\LastDeclaredEncoding}{\textsampi}
    \DeclareTextCommand{\textdigammagreek}{\LastDeclaredEncoding}{\textdigamma}
    \DeclareTextCommand{\textDigammagreek}{\LastDeclaredEncoding}{\textDigamma}

    \DeclareTextCommand{\textnumeralsigngreek}{\LastDeclaredEncoding}{\textdexiakeraia}
    \DeclareTextCommand{\textnumeralsignlowergreek}{\LastDeclaredEncoding}{\textaristerikeraia}

Two Unicode names for one character:

    \DeclareTextCommand{\accoxia}{\LastDeclaredEncoding}{\acctonos}
    \DeclareTextCommand{\acckoronis}{\LastDeclaredEncoding}{\accpsili}

Symbol macros for the breathings:

Moved to `textalpha.sty` to avoid clashes with local definitions of `\<` and `\>` in documents using LGR or babel-greek. (Bugreport David Kastrup). If you want to use the short macros without loading textalpha, you can define them in the document preamble like

    \DeclareTextCommand{\<}{LGR}{\accdasia}
    \DeclareTextCommand{\>}{LGR}{\accpsili}
    \DeclareTextCompositeCommand{\>}{LGR}{'}{\accpsilioxia}
    \DeclareTextCompositeCommand{\>}{LGR}{`}{\accpsilivaria}
    \DeclareTextCompositeCommand{\>}{LGR}{~}{\accpsiliperispomeni}
    \DeclareTextCompositeCommand{\<}{LGR}{'}{\accdasiaoxia}
    \DeclareTextCompositeCommand{\<}{LGR}{`}{\accdasiavaria}
    \DeclareTextCompositeCommand{\<}{LGR}{~}{\accdasiaperispomeni}

TODO: do we also want alternative symbols for the breathings (cf. X compose table, LCI encoding)?

    \DeclareTextCommand{\(}{\LastDeclaredEncoding}{\accdasia}
    \DeclareTextCommand{\)}{\LastDeclaredEncoding}{\accpsili}

Names from babel and teubner (do we want to define them here as alias?)

    \DeclareTextCommand{\anwtonos}{\LastDeclaredEncoding}{\textdexiakeraia}     % ʹ
    \DeclareTextCommand{\katwtonos}{\LastDeclaredEncoding}{\textaristerikeraia} % ͵

## Composite diacritics

Composite accents can be input as sequence of simple diacritics (in arbitrary order) via named macro, symbol macro and “transcription characters”, e.g. one of

    \accdialytica\accvaria\textalpha,
    \"\'\textalpha,
    \"'\textalpha, or
    \'"\textalpha.

Separate definitions for the supported variants of the second input token are required as composition is based on the non-expanded input

The composition with simple “transcription characters” must also be defined for the symbol macros, otherwise it fails with `\Makeuppercase`.

For Unicode encodings (where they do not resolve to Greek named macros, composite definitions starting with standard macros are requried:

    \DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{\acctonos}{\accdialytikatonos}
    \DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{\'}{\accdialytikatonos}
    \DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{'}{\accdialytikatonos}
    \DeclareTextCompositeCommand{\"}{\LastDeclaredEncoding}{\'}{\accdialytikatonos}
    \DeclareTextCompositeCommand{\"}{\LastDeclaredEncoding}{'}{\accdialytikatonos}
    \DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{\accvaria}{\accdialytikavaria}
    \DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{\`}{\accdialytikavaria}
    \DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{`}{\accdialytikavaria}
    \DeclareTextCompositeCommand{\"}{\LastDeclaredEncoding}{\`}{\accdialytikavaria}
    \DeclareTextCompositeCommand{\"}{\LastDeclaredEncoding}{`}{\accdialytikavaria}
    \DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{\accperispomeni}{\accdialytikaperispomeni}
    \DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{\~}{\accdialytikaperispomeni}
    \DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{~}{\accdialytikaperispomeni}
    \DeclareTextCompositeCommand{\"}{\LastDeclaredEncoding}{\~}{\accdialytikaperispomeni}
    \DeclareTextCompositeCommand{\"}{\LastDeclaredEncoding}{~}{\accdialytikaperispomeni}

    \DeclareTextCompositeCommand{\acctonos}{\LastDeclaredEncoding}{\accdialytika}{\accdialytikatonos}
    \DeclareTextCompositeCommand{\acctonos}{\LastDeclaredEncoding}{\"}{\accdialytikatonos}
    \DeclareTextCompositeCommand{\acctonos}{\LastDeclaredEncoding}{"}{\accdialytikatonos}
    \DeclareTextCompositeCommand{\'}{\LastDeclaredEncoding}{\"}{\accdialytikatonos}
    \DeclareTextCompositeCommand{\'}{\LastDeclaredEncoding}{"}{\accdialytikatonos}
    \DeclareTextCompositeCommand{\acctonos}{\LastDeclaredEncoding}{\accdasia}{\accdasiaoxia}
    \DeclareTextCompositeCommand{\acctonos}{\LastDeclaredEncoding}{\<}{\accdasiaoxia}
    \DeclareTextCompositeCommand{\acctonos}{\LastDeclaredEncoding}{<}{\accdasiaoxia}
    \DeclareTextCompositeCommand{\'}{\LastDeclaredEncoding}{\<}{\accdasiaoxia}
    \DeclareTextCompositeCommand{\'}{\LastDeclaredEncoding}{<}{\accdasiaoxia}
    \DeclareTextCompositeCommand{\acctonos}{\LastDeclaredEncoding}{\accpsili}{\accpsilioxia}
    \DeclareTextCompositeCommand{\acctonos}{\LastDeclaredEncoding}{\>}{\accpsilioxia}
    \DeclareTextCompositeCommand{\acctonos}{\LastDeclaredEncoding}{>}{\accpsilioxia}
    \DeclareTextCompositeCommand{\'}{\LastDeclaredEncoding}{\>}{\accpsilioxia}
    \DeclareTextCompositeCommand{\'}{\LastDeclaredEncoding}{>}{\accpsilioxia}
    \DeclareTextCompositeCommand{\'}{\LastDeclaredEncoding}{\'}{\textquoteright}
    \DeclareTextCompositeCommand{\'}{\LastDeclaredEncoding}{'}{\textquoteright}

    \DeclareTextCompositeCommand{\accvaria}{\LastDeclaredEncoding}{\accdialytika}{\accdialytikavaria}
    \DeclareTextCompositeCommand{\accvaria}{\LastDeclaredEncoding}{\"}{\accdialytikavaria}
    \DeclareTextCompositeCommand{\accvaria}{\LastDeclaredEncoding}{"}{\accdialytikavaria}
    \DeclareTextCompositeCommand{\`}{\LastDeclaredEncoding}{\"}{\accdialytikavaria}
    \DeclareTextCompositeCommand{\`}{\LastDeclaredEncoding}{"}{\accdialytikavaria}
    \DeclareTextCompositeCommand{\accvaria}{\LastDeclaredEncoding}{\accdasia}{\accdasiavaria}
    \DeclareTextCompositeCommand{\accvaria}{\LastDeclaredEncoding}{\<}{\accdasiavaria}
    \DeclareTextCompositeCommand{\accvaria}{\LastDeclaredEncoding}{<}{\accdasiavaria}
    \DeclareTextCompositeCommand{\`}{\LastDeclaredEncoding}{\<}{\accdasiavaria}
    \DeclareTextCompositeCommand{\`}{\LastDeclaredEncoding}{<}{\accdasiavaria}
    \DeclareTextCompositeCommand{\accvaria}{\LastDeclaredEncoding}{\accpsili}{\accpsilivaria}
    \DeclareTextCompositeCommand{\accvaria}{\LastDeclaredEncoding}{\>}{\accpsilivaria}
    \DeclareTextCompositeCommand{\accvaria}{\LastDeclaredEncoding}{>}{\accpsilivaria}
    \DeclareTextCompositeCommand{\`}{\LastDeclaredEncoding}{\>}{\accpsilivaria}
    \DeclareTextCompositeCommand{\`}{\LastDeclaredEncoding}{>}{\accpsilivaria}
    \DeclareTextCompositeCommand{\`}{\LastDeclaredEncoding}{\`}{\textquoteleft}
    \DeclareTextCompositeCommand{\`}{\LastDeclaredEncoding}{`}{\textquoteleft}

    \DeclareTextCompositeCommand{\accperispomeni}{\LastDeclaredEncoding}{\accdialytika}{\accdialytikaperispomeni}
    \DeclareTextCompositeCommand{\accperispomeni}{\LastDeclaredEncoding}{\"}{\accdialytikaperispomeni}
    \DeclareTextCompositeCommand{\accperispomeni}{\LastDeclaredEncoding}{"}{\accdialytikaperispomeni}
    \DeclareTextCompositeCommand{\~}{\LastDeclaredEncoding}{\"}{\accdialytikaperispomeni}
    \DeclareTextCompositeCommand{\~}{\LastDeclaredEncoding}{"}{\accdialytikaperispomeni}
    \DeclareTextCompositeCommand{\accperispomeni}{\LastDeclaredEncoding}{\accdasia}{\accdasiaperispomeni}
    \DeclareTextCompositeCommand{\accperispomeni}{\LastDeclaredEncoding}{\<}{\accdasiaperispomeni}
    \DeclareTextCompositeCommand{\accperispomeni}{\LastDeclaredEncoding}{<}{\accdasiaperispomeni}
    \DeclareTextCompositeCommand{\~}{\LastDeclaredEncoding}{\<}{\accdasiaperispomeni}
    \DeclareTextCompositeCommand{\~}{\LastDeclaredEncoding}{<}{\accdasiaperispomeni}
    \DeclareTextCompositeCommand{\accperispomeni}{\LastDeclaredEncoding}{\accpsili}{\accpsiliperispomeni}
    \DeclareTextCompositeCommand{\accperispomeni}{\LastDeclaredEncoding}{\>}{\accpsiliperispomeni}
    \DeclareTextCompositeCommand{\accperispomeni}{\LastDeclaredEncoding}{>}{\accpsiliperispomeni}
    \DeclareTextCompositeCommand{\~}{\LastDeclaredEncoding}{\>}{\accpsiliperispomeni}
    \DeclareTextCompositeCommand{\~}{\LastDeclaredEncoding}{>}{\accpsiliperispomeni}

    \DeclareTextCompositeCommand{\accpsili}{\LastDeclaredEncoding}{\acctonos}{\accpsilioxia}
    \DeclareTextCompositeCommand{\accpsili}{\LastDeclaredEncoding}{\'}{\accpsilioxia}
    \DeclareTextCompositeCommand{\accpsili}{\LastDeclaredEncoding}{'}{\accpsilioxia}
    \DeclareTextCompositeCommand{\accpsili}{\LastDeclaredEncoding}{\accvaria}{\accpsilivaria}
    \DeclareTextCompositeCommand{\accpsili}{\LastDeclaredEncoding}{\`}{\accpsilivaria}
    \DeclareTextCompositeCommand{\accpsili}{\LastDeclaredEncoding}{`}{\accpsilivaria}
    \DeclareTextCompositeCommand{\accpsili}{\LastDeclaredEncoding}{\accperispomeni}{\accpsiliperispomeni}
    \DeclareTextCompositeCommand{\accpsili}{\LastDeclaredEncoding}{\~}{\accpsiliperispomeni}
    \DeclareTextCompositeCommand{\accpsili}{\LastDeclaredEncoding}{~}{\accpsiliperispomeni}

    \DeclareTextCompositeCommand{\accdasia}{\LastDeclaredEncoding}{\acctonos}{\accdasiaoxia}
    \DeclareTextCompositeCommand{\accdasia}{\LastDeclaredEncoding}{\'}{\accdasiaoxia}
    \DeclareTextCompositeCommand{\accdasia}{\LastDeclaredEncoding}{'}{\accdasiaoxia}
    \DeclareTextCompositeCommand{\accdasia}{\LastDeclaredEncoding}{\accvaria}{\accdasiavaria}
    \DeclareTextCompositeCommand{\accdasia}{\LastDeclaredEncoding}{\`}{\accdasiavaria}
    \DeclareTextCompositeCommand{\accdasia}{\LastDeclaredEncoding}{`}{\accdasiavaria}
    \DeclareTextCompositeCommand{\accdasia}{\LastDeclaredEncoding}{\accperispomeni}{\accdasiaperispomeni}
    \DeclareTextCompositeCommand{\accdasia}{\LastDeclaredEncoding}{\~}{\accdasiaperispomeni}

## UPPERCASE

If UPPERCASE (all-caps) is generated with `\MakeUppercase`, macro substitutions in the `\@uclclist` apply. This can be used to drop the diacritics (except dialytika and sub-iota). Different conventions exist for the treatment of sub-iota with uppercase letters. In the CB Fonts, an “index” iota is used.

### @uclclist extension

Based on the babel patch and `fontenc.sty`.

The definition of an auxiliary, self-restting macro makes this idempotent (only the first use of this function will expand the `@uclclist`). The second and third lines are TeX’ way of writing `uclclist += …`:

    \providecommand*\update@uclc@with@greek{%
      \expandafter\def\expandafter\@uclclist\expandafter{%
        \@uclclist
        \accdasia\LGR@accdropped
        \accdasiaoxia\LGR@hiatus
        \accdasiavaria\LGR@accdropped
        \accdasiaperispomeni\LGR@accdropped
        \accpsili\LGR@hiatus
        \accpsilioxia\LGR@hiatus
        \accpsilivaria\LGR@hiatus
        \accpsiliperispomeni\LGR@accdropped
        \acctonos\LGR@hiatus
        \accvaria\LGR@accdropped
        \accdialytikatonos\LGR@accDialytika
        \accdialytikavaria\LGR@accDialytika
        \accdialytikaperispomeni\LGR@accDialytika
        \accperispomeni\LGR@accdropped
        \ypogegrammeni\prosgegrammeni
        \textalpha  \textAlpha
        \textbeta   \textBeta
        \textgamma  \textGamma
        \textdelta  \textDelta
        \textepsilon\textEpsilon
        \textzeta   \textZeta
        \texteta    \textEta
        \texttheta  \textTheta
        \textiota   \textIota
        \textkappa  \textKappa
        \textlambda \textLambda
        \textmu     \textMu
        \textnu     \textNu
        \textxi     \textXi
        \textomicron\textOmicron
        \textpi     \textPi
        \textrho    \textRho
        \textvarsigma  \textSigma
        \textsigma     \textSigma
        \textautosigma \textSigma
        \texttau    \textTau
        \textupsilon\textUpsilon
        \textphi    \textPhi
        \textchi    \textChi
        \textpsi    \textPsi
        \textomega  \textOmega
        \textqoppa     \textQoppa
        \textvarstigma \textStigma
        \textstigma    \textStigma
        \textsampi     \textSampi
        \textdigamma   \textDigamma
      }%
      \let\update@uclc@with@greek\relax
    }

Expand the uclc list using the just defined macro:

    \update@uclc@with@greek

### Substitution macros

Drop diacritics (The argument passing ensures that kerning is preserved)

    \DeclareTextCommand{\LGR@accdropped}{\LastDeclaredEncoding}[1]{#1}

Keep dialytika: Define a dummy alias so that downcasing with `\MakeLowercase` does not convert a simple dialytika to a composite accent:

    \DeclareTextCommand{\LGR@accDialytika}{\LastDeclaredEncoding}{\accdialytika}
    \DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{\LGR@hiatus}{\accdialytika}

### Mark hiatus

Tonos and dasia mark a hiatus if placed on the first vowel of a diphthong (ΑΙ, ΑΥ, ΕΙ). A dialytika must be placed on the second vowel if they are dropped (άυλος → ΑΫΛΟΣ, μάινα → ΜΑΪΝΑ, κέικ → ΚΕΪΚ, ἀυπνία → ΑΫΠΝΙΑ):

    \DeclareTextCommand{\LGR@hiatus}{\LastDeclaredEncoding}[1]{#1}
    \DeclareTextCompositeCommand{\LGR@hiatus}{\LastDeclaredEncoding}{>}{\LGR@hiatus}
    \DeclareTextCompositeCommand{\LGR@hiatus}{\LastDeclaredEncoding}{<}{\LGR@accdropped}
    \DeclareTextCompositeCommand{\LGR@hiatus}{\LastDeclaredEncoding}{\textAlpha}{\LGR@A@hiatus}
    \DeclareTextCompositeCommand{\LGR@hiatus}{\LastDeclaredEncoding}{\textEpsilon}{\LGR@E@hiatus}

The font encoding file must define the `\LGR@hiatus` TextCommand. See `lgrenc.def` for an example.

The following macro can be used to test if the next character is an Alpha or Epsilon. As `\@ifnextchar` gobbles spaces the lookahead macro definition from `amsgen.sty` is used:

> This macro is a new version of LaTeX’s `\@ifnextchar`, macro that does not skip over spaces.

    \providecommand*{\LGR@ifnextchar}[3]{%
      \let\reserved@d= #1%
      \def\reserved@a{#2}\def\reserved@b{#3}%
      \futurelet\@let@token\LGR@ifnch
    }
    \providecommand*{\LGR@ifnch}{%
      \ifx\@let@token\reserved@d \let\reserved@b\reserved@a \fi
      \reserved@b
    }