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SandBoxLexicalScope

Edit detail for SandBoxLexicalScope revision 6 of 12

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Editor: Bill Page Time: 2008/05/13 08:14:12 GMT-7
Note: scope issues

added:

Ralf wrote:

Ooops, what in would be illegal? I just had to replace
(as I said) the braces by parentheses, since parens are
used to group sequences of commands. (Same as braces in
Aldor.)

\begin{spad}
)abbrev domain AAA Aaa
Aaa: with
    bar: Integer -> Integer
  == add
    (x: Integer := 4; y: Integer := 3)
    bar(a: Integer): Integer == x + a + z
    z: Integer := 3 + y
\end{spad}

But this works?
\begin{spad}
)abbrev domain AAA Aaa
Aaa: with
    bar: Integer -> Integer
  == add
    (x: Integer := 4; y: Integer := 3)
    z: Integer := 3 + y
    bar(a: Integer): Integer == x + a + z
\end{spad}

j is referenced out of scope

axiomfor i in 1..5 repeat
        j:Integer := i^2
        output(i::OutputForm)$OutputPackage
   1
   2
   3
   4
   5

Type: Void

axiomoutput(j::OutputForm)$OutputPackage
   25

Type: Void

The code above returns an error in OpenAxiom? 1.2.0 (Revision >= 563).

It sould be written like this:

axiom
j: Integer

Type: Void

axiomfor i in 1..5 repeat
        j := i^2
        output(i::OutputForm)$OutputPackage
   1
   2
   3
   4
   5

Type: Void

axiomoutput(j::OutputForm)$OutputPackage
   25

Type: Void

Oddly, using j out of scope is also allowed in Aldor:

aldor#pile
#include "axiom"
import from PositiveInteger
CheckScope1(): with
    checkscope1: () -> PositiveInteger
  == add
    checkscope1():PositiveInteger ==
      for i in 1..5 repeat
        j:PositiveInteger := i^2
        --output(i::OutputForm)$OutputPackage
      --output(j::OutputForm)$OutputPackage
      j

aldor

   Compiling FriCAS source code from file 
      /var/zope2/var/LatexWiki/8452782754204589047-25px003.as using 
      AXIOM-XL compiler and options 
-O -Fasy -Fao -Flsp -laxiom -Mno-AXL_W_WillObsolete -DAxiom -Y $AXIOM/algebra
      Use the system command )set compiler args to change these 
      options.
#1 (Warning) Deprecated message prefix: use `ALDOR_' instead of `_AXL'
   Compiling Lisp source code from file 
      ./8452782754204589047-25px003.lsp
   Issuing )library command for 8452782754204589047-25px003
   Reading /var/zope2/var/LatexWiki/8452782754204589047-25px003.asy
   CheckScope1 is now explicitly exposed in frame initial 
   CheckScope1 will be automatically loaded when needed from 
      /var/zope2/var/LatexWiki/8452782754204589047-25px003

axiom
checkscope1()

(1)

Type: PositiveInteger?

aldor#pile
#include "axiom"
import from PositiveInteger
CheckScope2(): with
    checkscope2: () -> PositiveInteger
  == add
    checkscope2():PositiveInteger ==
      local j:PositiveInteger
      for i in 1..5 repeat
        j := i^2
        --output(i::OutputForm)
        --output(j::OutputForm)$OutputPackage
      j

aldor

   Compiling FriCAS source code from file 
      /var/zope2/var/LatexWiki/8264748852590484820-25px005.as using 
      AXIOM-XL compiler and options 
-O -Fasy -Fao -Flsp -laxiom -Mno-AXL_W_WillObsolete -DAxiom -Y $AXIOM/algebra
      Use the system command )set compiler args to change these 
      options.
#1 (Warning) Deprecated message prefix: use `ALDOR_' instead of `_AXL'
   Compiling Lisp source code from file 
      ./8264748852590484820-25px005.lsp
   Issuing )library command for 8264748852590484820-25px005
   Reading /var/zope2/var/LatexWiki/8264748852590484820-25px005.asy
   CheckScope2 is now explicitly exposed in frame initial 
   CheckScope2 will be automatically loaded when needed from 
      /var/zope2/var/LatexWiki/8264748852590484820-25px005

axiom
checkscope2()

(2)

Type: PositiveInteger?

Ralf wrote:

Ooops, what in would be illegal? I just had to replace (as I said) the braces by parentheses, since parens are used to group sequences of commands. (Same as braces in Aldor.)

spad)abbrev domain AAA Aaa
Aaa: with
    bar: Integer -> Integer
  == add
    (x: Integer := 4; y: Integer := 3)
    bar(a: Integer): Integer == x + a + z
    z: Integer := 3 + y

spad

   Compiling FriCAS source code from file 
      /var/zope2/var/LatexWiki/2292316700013189339-25px007.spad using 
      old system compiler.
   AAA abbreviates domain Aaa 
------------------------------------------------------------------------
   initializing NRLIB AAA for Aaa 
   compiling into NRLIB AAA 
   compiling exported bar : Integer -> Integer
****** comp fails at level 2 with expression: ******
error in function bar 
(+ (+ |x| |a|) | << z >> |)
****** level 2  ******
$x:= z
$m:= $EmptyMode
$f:=
((((|a| # #) (|y| # #) (|x| # #) (* # # #) ...)))
   >> Apparent user error:
   cannot compile (+ (+ x a) z)

But this works?

spad)abbrev domain AAA Aaa
Aaa: with
    bar: Integer -> Integer
  == add
    (x: Integer := 4; y: Integer := 3)
    z: Integer := 3 + y
    bar(a: Integer): Integer == x + a + z

spad

   Compiling FriCAS source code from file 
      /var/zope2/var/LatexWiki/5820990303886118597-25px008.spad using 
      old system compiler.
   AAA abbreviates domain Aaa 
------------------------------------------------------------------------
   initializing NRLIB AAA for Aaa 
   compiling into NRLIB AAA 
   compiling exported bar : Integer -> Integer
Time: 0 SEC.
(time taken in buildFunctor:  0)
;;;     ***       |Aaa| REDEFINED
;;;     ***       |Aaa| REDEFINED
Time: 0 SEC.
   Cumulative Statistics for Constructor Aaa
      Time: 0 seconds
   finalizing NRLIB AAA 
   Processing Aaa for Browser database:
--->-->Aaa((bar ((Integer) (Integer)))): Not documented!!!!
--->-->Aaa(constructor): Not documented!!!!
--->-->Aaa(): Missing Description
------------------------------------------------------------------------
   Aaa is now explicitly exposed in frame initial 
   Aaa will be automatically loaded when needed from 
      /var/zope2/var/LatexWiki/AAA.NRLIB/code

... --gdr, Sun, 11 May 2008 12:51:53 -0700 reply

Aldor (at least, the reference manual says) so makes variable declarations `local', unless modified by `free' or `fluid' modifiers.