Updates for ksh array element syntax.

Move detection of key/value pairs down into prefork().

Detect normal array assignment and [key]=val array assignemnt
separately.  Mark key / value pairs with Marker and pass up flag.  Deal
with marked triads specially later on.

1 files changed, 18 insertions, 5 deletions

diff --git a/Doc/Zsh/params.yo b/Doc/Zsh/params.yo
index c675cba3e..f3cec345d 100644
--- a/Doc/Zsh/params.yo
+++ b/Doc/Zsh/params.yo
@@ -109,10 +109,19 @@ of subscript expression that may be used when directly subscripting a
 variable name, described in the section Array Subscripts below, are not
 available.
 
-When assigning with this third form, every element must use this syntax or
-an error is generated.  Likewise, if the first entry does not match this
-form, any later entry that does is taken  as a simple value rather than a
-key / value pair.  Both var(key) and var(value) undergo all forms of expansion
+The syntaxes with and without the explicit key may be mixed.  Any absent
+var(key) is deduced by incrementing the index from the previously
+assigned element.  Note that it is not treated as an error
+if latter assignements in this form overwrite earlier assignments.
+
+For example, assuming the option tt(KSH_ARRAYS) is not set, the following:
+
+example(array=LPAR()one [3]=three four+RPAR())
+
+causes the array variable tt(array) to contain four elements tt(one),
+an empty string, tt(three) and tt(four), in that order.
+
+Both var(key) and var(value) undergo all forms of expansion
 allowed for single word shell expansions (this does not include filename
 generation); these are as performed by the parameter expansion flag
 tt(LPAR()e+RPAR()) as described in
@@ -120,7 +129,7 @@ ifzman(zmanref(zshparam))\
 ifnzman(noderef(Parameter Expansion)).
 Nested parentheses may surround var(value) and are included as part of the
 value, which is joined into a plain string; this differs from ksh which
-allows the values to themselves be arrays.  A future version of zsh may
+allows the values themselves to be arrays.  A future version of zsh may
 support that.  To cause the brackets to be interpreted as a character
 class for filename generation, and therefore to treat the resulting list
 of files as a set of values, quote the equal sign using any form of quoting.
@@ -159,6 +168,10 @@ indent(tt(set -A) var(name) var(key) var(value) ...)
 indent(var(name)tt(=LPAR())var(key) var(value) ...tt(RPAR()))
 indent(var(name)tt(=LPAR())tt([)var(key)tt(]=)var(value) ...tt(RPAR()))
 
+Note that only one of the two syntaxes above may be used in any
+given assignment; the forms may not be mixed.  This is unlike the case
+of numerically indexed arrays.
+
 Every var(key) must have a var(value) in this case.  Note that this
 assigns to the entire array, deleting any elements that do not appear in
 the list.  The append syntax may also be used with an associative array: