forked from GitHub/gf-core
update highlights; fix cat warning bug
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aarne
@@ -6,11 +6,11 @@
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<h1>Grammatical Framework Version 2</h1>
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Highlights, version 2.0
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Highlights, versions 2.0 and 2.1
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<p>
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13/10/2003 - 25/11 - 2/4/2004 - 18/6
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13/10/2003 - 25/11 - 2/4/2004 - 18/6 - 13/10
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<p>
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@@ -40,12 +40,13 @@ An accurate <a href="DocGF.pdf">language specification</a> is now available.
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<tt>interface</tt>, <tt>instance</tt>, <tt>incomplete</tt>.
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<li> New experimental module types: <tt>transfer</tt>,
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<tt>union</tt>.
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<li> <b>Version 2.1</b>: multiple inheritance in module extension.
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<h4>Canonical format GFC</h4>
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<li> The target of GF compiler; to reuse, just read in
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<li> Readable by Haskell/Java/C++/C applications
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<li> The target of GF compiler; to reuse, just read in.
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<li> Readable by Haskell/Java/C++/C applications.
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<li> <b>Version 2.1</b>: Java interpreter available for GFC (by Björn Bringert).
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<h4>New features in expression language</h4>
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@@ -58,6 +59,8 @@ An accurate <a href="DocGF.pdf">language specification</a> is now available.
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braces and <tt>where</tt>.
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<li> Pattern variables can be used on lhs's of <tt>oper</tt> definitions.
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<li> New Unicode transliterations (by Harad Hammarström).
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<li> <b>Version 2.1</b>: Initial segments of integers
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(<tt>Ints</tt><i>n</i>) available as parameter types.
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<h4>New shell commands and command functionalities</h4>
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@@ -103,32 +106,22 @@ An accurate <a href="DocGF.pdf">language specification</a> is now available.
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<li> By Peter Ljunglöf, based on MCFG.
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<li> Much more efficient for morphology and discontinuous constituents.
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<li> Treatment of cyclic rules.
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<li> <b>Version 2.1</b>: improved generation of speech recognition
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grammars (by Björn Bringert).
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<li> <b>Version 2.1</b>: output of Labelled BNF files readable by the
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BNF Converter.
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<!-- NEW -->
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<h2>Status (18/6/2004)</h2>
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<h2>Missing features of GF 1.2 (13/10/2004)</h2>
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Grammar compiler, editor GUIs, and shell work for all platforms
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(with restrictions for Solaris).
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<p>
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The updated <tt>HelpFile</tt> (accessible through <tt>h</tt> command)
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marks unsupported features present in GF 1.2 with <tt>*</tt>.
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They will be supported again if interested users appear.
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<p>
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GF1 grammars can be automatically translated to GF2 (although the
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Generally, GF1 grammars can be automatically translated to GF2, although the
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result is not as good
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as manual, since indentation and comments are destroyed). The results can be
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as manual, since indentation and comments are destroyed.
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The results can be
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saved in GF2 files, but this is not necessary.
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Some rarely used GF1 features are no longer supported (see next section).
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<p>
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It is also possible to write a GF2 grammar back to GF1, with the
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command <tt>pg -printer=old</tt>.
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@@ -136,14 +129,10 @@ command <tt>pg -printer=old</tt>.
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<p>
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Resource libraries
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and some example grammars and have been
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and some example grammars have been
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converted. Most old example grammars work without any changes.
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There is a new resource API with
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many new constructions.
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<p>
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A make facility works, finding out which modules have to be recompiled.
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However, there is a new resource API with
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many new constructions, and which is recommended.
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<p>
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@@ -313,16 +302,10 @@ Examples of extension:
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lin times x y = expSg ("the" ++ "product" ++ "of" ++ x.s ++ "and" ++ y.s) ;
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}
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</pre>
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Another important difference:
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<li> extension is single
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<li> opening can be multiple: <tt>open Foo, Bar, Baz in {...}</tt>
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<p>
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Moreover:
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<li> opening can be <b>qualified</b>
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<p>
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Example of qualified opening:
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Opening, but not extension, can be <b>qualified</b>:
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<pre>
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concrete NumberSystems of Systems = open (Bin = Binary), (Dec = Decimal) in {
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lin
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@@ -330,6 +313,17 @@ Example of qualified opening:
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DZero = Dec.Zero
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}
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</pre>
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<p>
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<b>Version 2.1</b> introduces <tt>multiple inheritance</tt>: a module
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can extend several modules at the same time, for instance,
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<pre>
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abstract Dialogue = User, System ** { ...}
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</pre>
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may be used to put together "User's moves" and "System's moves" into
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one Dialogue System grammar.
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<!-- NEW -->
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@@ -346,7 +340,7 @@ first left bracket (<tt>{</tt>). The header gives
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<li> the module type: <tt>abstract</tt>, <tt>concrete</tt> (<tt>of</tt> <i>A</i>),
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or <tt>resource</tt>
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<li> the name of the module (next to the module type keyword)
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<li> the name of extended module (between <tt>=</tt> and <tt>**</tt>)
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<li> the names of extended modules (between <tt>=</tt> and <tt>**</tt>)
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<li> the names of opened modules
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</ul>
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@@ -250,7 +250,7 @@ execC co@(comm, opts0) sa@((st,(h,_)),a) = checkOptions st co >> case comm of
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let c0 = firstAbsCat os gro
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c <- GrammarToCanon.redQIdent c0
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lang <- maybeErr "no concrete" $ languageOfOptState os st
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t <- Look.lookupLincat cgr $ CMacros.redirectIdent lang c
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t <- return $ errVal CMacros.defLinType $ Look.lookupLincat cgr $ CMacros.redirectIdent lang c
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return $ if CMacros.isDiscontinuousCType t
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then (putStrLn ("Warning: discontinuous category" +++ prt_ c))
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else (return ())
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