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aarne
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<TITLE> Predefined functions for concrete syntax</TITLE>
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<P ALIGN="center"><CENTER><H1> Predefined functions for concrete syntax</H1>
<FONT SIZE="4">
<I>Last update: 2006-02-25 22:19:20 CET</I><BR>
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<P>
Produced by
gfdoc - a rudimentary GF document generator.
(c) Aarne Ranta (<A HREF="mailto:aarne@cs.chalmers.se">aarne@cs.chalmers.se</A>) 2002 under GNU GPL.
</P>
<P>
The definitions of these constants are hard-coded in GF, and defined
in <A HREF="../src/GF/Grammar/AppPredefined.hs">AppPredefined.hs</A>. Applying
them to run-time variables leads to compiler errors that are often
only detected at the code generation time.
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<PRE>
resource Predef = {
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This type of booleans is for internal use only.
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<PRE>
param PBool = PTrue | PFalse ;
oper Int : Type = variants {} ; -- the type of integers
oper Ints : Int -&gt; Type = variants {} ; -- the type of integers from 0 to n
oper length : Tok -&gt; Int = variants {} ; -- length of string
oper drop : Int -&gt; Tok -&gt; Tok = variants {} ; -- drop prefix of length
oper take : Int -&gt; Tok -&gt; Tok = variants {} ; -- take prefix of length
oper tk : Int -&gt; Tok -&gt; Tok = variants {} ; -- drop suffix of length
oper dp : Int -&gt; Tok -&gt; Tok = variants {} ; -- take suffix of length
oper eqInt : Int -&gt; Int -&gt; PBool = variants {} ; -- test if equal integers
oper lessInt: Int -&gt; Int -&gt; PBool = variants {} ; -- test order of integers
oper plus : Int -&gt; Int -&gt; Int = variants {} ; -- add integers
oper eqStr : Tok -&gt; Tok -&gt; PBool = variants {} ; -- test if equal strings
oper occur : Tok -&gt; Tok -&gt; PBool = variants {} ; -- test if occurs as substring
oper occurs : Tok -&gt; Tok -&gt; PBool = variants {} ; -- test if any char occurs
oper show : (P : Type) -&gt; P -&gt; Tok = variants {} ; -- convert param to string
oper read : (P : Type) -&gt; Tok -&gt; P = variants {} ; -- convert string to param
oper toStr : (L : Type) -&gt; L -&gt; Str = variants {} ; -- find the "first" string
oper mapStr : (L : Type) -&gt; (Str -&gt; Str) -&gt; L -&gt; L = variants {} ;
-- map all strings in a data structure; experimental ---
} ;
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