From fbec213cc5ab0d0316c98bd9ddb883bae3bbdbc5 Mon Sep 17 00:00:00 2001 From: Bart Schaefer Date: Thu, 23 Nov 2023 13:23:55 -0800 Subject: 52325: Clarify doc for edge cases of named references and nofork substitution Unposted whitespace change avoids a parse error in ${ ... } with comments. --- Doc/Zsh/expn.yo | 8 +++++++- Doc/Zsh/mod_ksh93.yo | 7 ------- Doc/Zsh/params.yo | 10 +++++++--- 3 files changed, 14 insertions(+), 11 deletions(-) (limited to 'Doc/Zsh') diff --git a/Doc/Zsh/expn.yo b/Doc/Zsh/expn.yo index 837a85db6..e5506d469 100644 --- a/Doc/Zsh/expn.yo +++ b/Doc/Zsh/expn.yo @@ -1600,6 +1600,10 @@ example(tt(before local: OUTER) tt(by reference: OUTER) tt(after func: RESULT)) +Note, however, that named references to em(special) parameters acquire +the behavior of the special parameter, regardless of the scope where +the reference is declared. + When var(rname) includes an array subscript, the subscript expression is interpreted at the time tt(${)var(pname)tt(}) is expanded. Any form of subscript is allowed, including those that select individual @@ -1929,7 +1933,9 @@ Note that because the `tt(${|)...tt(})' and `tt(${ )...tt( })' forms must be parsed at once as both string tokens and commands, all other braces (`tt({)' or `tt(})') within the command either must be quoted, or must appear in syntactically valid pairs, such as around complex -commands, function bodies, or parameter references. +commands, function bodies, or parameter references. Furthermore, +comments are always recognized, even when tt(NO_INTERACTIVE_COMMENTS) +is in effect. texinode(Arithmetic Expansion)(Brace Expansion)(Command Substitution)(Expansion) sect(Arithmetic Expansion) diff --git a/Doc/Zsh/mod_ksh93.yo b/Doc/Zsh/mod_ksh93.yo index 99dab385f..9cd708d10 100644 --- a/Doc/Zsh/mod_ksh93.yo +++ b/Doc/Zsh/mod_ksh93.yo @@ -184,13 +184,6 @@ When a function of this name is defined, it is called whenever the parameter var(name) would be unset. The function must explicitly `tt(unset )var(name)', otherwise the variable remains set. -em(THIS FEATURE IS NOT YET IMPLEMENTED.) -) -item(tt(${ )var(list)tt(;}))( -Note the space after the opening brace (tt({)). This executes var(list) -in the current shell and substitutes its standard output in the manner -of `tt($LPAR())var(list)tt(RPAR())' but without forking. - em(THIS FEATURE IS NOT YET IMPLEMENTED.) ) item(tt(typeset -C )var(name)[tt(=)var(values)tt( ...)])( diff --git a/Doc/Zsh/params.yo b/Doc/Zsh/params.yo index 5653b3bc9..68df4a16f 100644 --- a/Doc/Zsh/params.yo +++ b/Doc/Zsh/params.yo @@ -748,9 +748,13 @@ vindex(argv) item(tt(argv) )( Same as tt(*). Assigning to tt(argv) changes the local positional parameters, but tt(argv) is em(not) itself a local parameter. -Deleting tt(argv) with tt(unset) in any function deletes it everywhere, -although only the innermost positional parameter array is deleted (so -tt(*) and tt(@) in other scopes are not affected). +Deleting tt(argv) with tt(unset) in any function deletes it everywhere. +This can be avoided by declaring `tt(local +h argv)' before unsetting. +Even when not so declared, only the innermost positional parameter +array is deleted (so tt(*) and tt(@) in other scopes are not affected). + +A named reference to tt(argv) em(does not) permit a called function to +access the positional parameters of its caller. ) vindex(@) item(tt(@) )( -- cgit 1.4.1