diff options
Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 14 |
1 files changed, 9 insertions, 5 deletions
@@ -40680,22 +40680,25 @@ operator. .synb .mets >> @( function << arg *) .mets >> @( function << arg * >> @ avar << arg *) +.mets >> @( function << arg * . <> @ avar ) .mets >> @(@ rvar >> ( function << arg *)) .mets >> @(@ rvar >> ( function << arg * >> @ avar << arg *)) +.mets >> @(@ rvar >> ( function << arg * . <> @ avar )) .syne .desc Whenever the operator position of a pattern consists of a symbol which is not the name of a predicate operator, the expression denotes a predicate pattern, -expected to conform to one of the first two syntax descriptions above. Whenever +expected to conform to one of the first three syntax descriptions above. Whenever the operator position of a pattern consists of a meta-variable, it is also a -predicate pattern, expected to conform to one of the second two syntax +predicate pattern, expected to conform to one of the three two syntax descriptions. The first form of the predicate pattern consists of a compound form consisting of an operator and arguments. Exactly one of the arguments may be a pattern variable .meta avar -("argument variable") which must be a bindable symbol. The role of +("argument variable") which must be a bindable symbol. The pattern variable +may also appear in the dot position, rather than as an argument. The role of .meta avar and the consequences of omitting it are described below. @@ -40731,8 +40734,9 @@ inserted into the compound form, substituted in the position indicated by the .mono .meti >> @ avar .onom -variable. This form is then evaluated. If it yields true, then the -match is successful, otherwise the match fails. +variable, either an ordinary argument position or the dot position. This form +is then evaluated. If it yields true, then the match is successful, otherwise +the match fails. If the .meta avar |