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Postings from June 2006
Author: larry
Date: Sat Jun 3 20:32:43 2006
New Revision: 9465
Modified:
doc/trunk/design/syn/S03.pod
Log:
Revisions to definitions of simple scalar.
Modified: doc/trunk/design/syn/S03.pod
==============================================================================
--- doc/trunk/design/syn/S03.pod (original)
+++ doc/trunk/design/syn/S03.pod Sat Jun 3 20:32:43 2006
@@ -116,14 +116,37 @@
and imply scalar assignment:
$a # simple scalar variable
- @a[123] # single literal subscript
- %a{'x'} # single literal subscript
+ @a[SIMPLE] # single simple subscript
+ %a{SIMPLE} # single simple subscript
%a<x> # single literal subscript
- @a[+TERM] # single term coerced to numeric for array
- %a{~TERM} # single term coerced to string for hash
+
+Where SIMPLE is defined as
+
+ 123 # single literal
+ 'x' # single literal
+ "$x" # single literal
+ qq/$x/ # single literal
+ +TERM # any single term coerced to numeric
+ -TERM # any single term coerced to numeric
+ ~TERM # any single term coerced to string
+ ?TERM # any single term coerced to boolean
+ !TERM # any single term coerced to boolean
@a[SIMPLE] # any of these simples used as subscript recursively
%a[SIMPLE] # any of these simples used as subscript recursively
+We also include:
+
+ OP SIMPLE
+ SIMPLE OP
+ SIMPLE OP SIMPLE
+
+where C<OP> is includes any standard scalar operators in the five
+precedence levels autoincrement, exponentiation, symbolic unary,
+multiplicative, and additive; but these are limited to standard
+operators that are known to return numbers, strings, or booleans.
+(Operators that imply list operations are excluded: C<$>, C<@>,
+and C<xx>, for instance. Hyper operators are also excluded.)
+
All other forms imply list assignment, and will evaluate both sides
of the assignment in list context (eventually). However, this is
primarily a syntactic distinction, and no semantic or type information