/usr/share/gap/lib/compiler.g is in gap-libs 4r7p5-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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##
#W compiler.g GAP library Frank Celler
##
##
#Y Copyright (C) 1997, Lehrstuhl D für Mathematik, RWTH Aachen, Germany
#Y (C) 1998 School Math and Comp. Sci., University of St Andrews, Scotland
#Y Copyright (C) 2002 The GAP Group
##
## This file contains the frontend function for the compiler.
##
#############################################################################
##
#F RatPairString( <string> ) . . . . . . . . . . . . . string -> 2 rationals
##
RatPairString := function( string )
local p, x, y;
# find ","
p := Position( string, ',' );
if p = false then
x := Rat(string);
y := x;
elif p = 1 then
x := 1;
y := Rat(string{[2..Length(string)]});
elif p = Length(string) then
x := Rat(string{[1..p-1]});
y := 1;
else
x := Rat(string{[1..p-1]});
y := Rat(string{[p+1..Length(string)]});
fi;
if x = 0 then x := 1; fi;
if y = 0 then y := 1; fi;
return [ x, y ];
end;
#############################################################################
##
#F ParseArguments( <def>, <args>, <pos> ) . . . . parse sequence of options
##
## <args> is a argument list and <pos> the position to start at. <def>
## describes the arguments, it is a record, whose record names correspond to
## paramters, the values describe the possible paramters:
##
## "switch" toggle the switch or set to the optional paramter
## "switch/true" default is `true'
## "switch/false" default is `false'
##
## "string" set to the mandatory paramter
## "string/default" default value
##
## "integer" set to the mandatory paramter
## "integer/default" default value
##
## "geometry" set to the two mandatory paramter width/height
## "geometry/wxh" default value
##
## "alias/name" define an alias
##
## Example:
##
## gap> a;
## rec(
## name := "string/test",
## nice := "switch/false",
## depth := "integer/10",
## ndepth := "integer" )
## gap> ParseArguments( a, [], 1 );
## rec(
## name := "test",
## nice := false,
## depth := 10 )
## gap> ParseArguments( a, ["ndepth",20], 1 );
## rec(
## name := "test",
## nice := false,
## depth := 10,
## ndepth := 20 )
##
ParseArguments := function( def, args, pos )
local IsMatch, SplitString, keys, type, val, key, tmp,
defaultGeometry, next, match;
# match a substring
IsMatch := function( a, b )
local c;
a := LowercaseString(a);
b := LowercaseString(b);
c := [ 1 .. Minimum( Length(a), Length(b) ) ];
return a{c} = b{c};
end;
# substring after <sep>
SplitString := function( str, sep )
local p;
p := Position( str, sep );
if p = fail then
return [ str, "" ];
else
return [ str{[1..p-1]}, str{[p+1..Length(str)]} ];
fi;
end;
# parse the default description
keys := RecNames(def);
type := rec();
val := rec();
for key in keys do
# a switch
if IsMatch( "switch", def.(key) ) then
type.(key) := "switch";
val.(key) := not IsMatch("false",SplitString(def.(key),'/')[2]);
# a string
elif IsMatch( "string", def.(key) ) then
type.(key) := "string";
val.(key) := SplitString( def.(key), '/' )[2];
# a geometry
elif IsMatch( "geometry", def.(key) ) then
type.(key) := "geometry";
tmp := SplitString( SplitString( def.(key), '/' )[2], 'x' );
val.(key) := List( tmp, Int );
if not IsBound(defaultGeometry) then
defaultGeometry := key;
fi;
# an integer
elif IsMatch( "integer", def.(key) ) then
type.(key) := "integer";
tmp := SplitString( def.(key), '/' )[2];
if 0 < Length(tmp) then tmp := Int(tmp); else tmp := fail; fi;
if tmp <> fail then val.(key) := tmp; fi;
# an alias
elif IsMatch( "alias", def.(key) ) then
type.(key) := "alias";
val.(key) := SplitString( def.(key), '/' )[2];
# unknown type
else
Error( "type '", def.(key), "' is unknown" );
fi;
od;
# parse the arguments starting at position <pos>
while pos <= Length(args) do
next := args[pos];
# an integer could be a geometry parameter
if IsInt(next) and pos < Length(args) and IsInt(args[pos+1]) then
if IsBound(defaultGeometry) then
if next <= 0 then
Error( "width must be non-negative, not ", next );
fi;
if args[pos+1] <= 0 then
Error("height must be non-negative, not ", args[pos+1]);
fi;
val.(defaultGeometry) := [ next, args[pos+1] ];
pos := pos+2;
else
Error( "'geometry' may not be specified" );
fi;
# just one integer
elif IsInt(next) then
tmp := Concatenation( "unknown parameter '", String(next),
"', known parameters are: " );
for key in [ 1 .. Length(keys) ] do
if 1 < key then Append( tmp, ", " ); fi;
Append( tmp, keys[key] );
od;
Error( tmp );
# check the other keys
else
match := false;
for key in keys do
if not match and IsMatch( key, next ) then
match := true;
# check for an alias
if type.(key) = "alias" then
key := val.(key);
fi;
# a switch takes an optional boolean argument
if type.(key) = "switch" then
if pos < Length(args) and IsBool(args[pos+1]) then
val.(key) := args[pos+1];
pos := pos+2;
else
val.(key) := not val.(key);
pos := pos+1;
fi;
# a string
elif type.(key) = "string" then
if pos=Length(args) or not IsString(args[pos+1]) then
Error( key, " requires a string argument" );
fi;
val.(key) := args[pos+1];
pos := pos+2;
# an integer
elif type.(key) = "integer" then
if pos=Length(args) or not IsInt(args[pos+1]) then
Error( key, " requires an integer argument" );
fi;
val.(key) := args[pos+1];
pos := pos+2;
# a geometry
elif type.(key) = "geometry" then
if pos+1 = Length(args) then
Error( key, " requires a width and height" );
fi;
if not IsInt(args[pos+1]) or args[pos+1] <= 0 then
Error( "width must be non-negative, not ",
args[pos+1] );
fi;
if not IsInt(args[pos+2]) or args[pos+2] <= 0 then
Error( "height must be non-negative, not ",
args[pos+2] );
fi;
val.(key) := [ args[pos+1], args[pos+2] ];
pos := pos+3;
fi;
fi;
od;
# we didn't found a match
if not match then
tmp := Concatenation( "unknown parameter '", next,
"', known parameters are: " );
for key in [ 1 .. Length(keys) ] do
if 1 < key then Append( tmp, ", " ); fi;
Append( tmp, keys[key] );
od;
Error( tmp );
fi;
fi;
od;
# that's it, remove alias entries
for key in keys do
if type.(key) = "alias" then
Unbind(val.(key));
fi;
od;
return val;
end;
#############################################################################
##
#F CompileFunc( <output>, <function>, <module_name>, ... )
##
## <output> must be a filename,
## <function> the function to compile,
## <module_name> the name used in the compiled module
##
## optional parameters are:
## "Magic1"
## "Magic2"
## "FastIntArith"
## "FastPlainLists"
## "CheckTypes"
## "CheckListElements"
## "CheckPosObjElements"
##
CompileFunc := function( arg )
local output, func, name, arguments;
output := arg[1];
func := arg[2];
name := arg[3];
arguments := rec(
magic1 := "integer/0",
magic2 := "string",
fastintarith := "switch/true",
fastplainlists := "switch/true",
checktypes := "switch/true",
checklistelements := "switch/true",
checkposobjelements := "switch/true" );
arguments := ParseArguments( arguments, arg, 4 );
return COMPILE_FUNC(
output, func, name,
arguments.magic1, arguments.magic2, arguments.fastintarith,
arguments.fastplainlists, arguments.checktypes,
arguments.checklistelements, arguments.checkposobjelements );
end;
#############################################################################
##
#E compiler.g . . . . . . . . . . . . . . . . . . . . . . . . . . ends here
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