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Diffstat (limited to 'doc/lispref/parsing.texi')
| -rw-r--r-- | doc/lispref/parsing.texi | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/doc/lispref/parsing.texi b/doc/lispref/parsing.texi index 5d1b11935cf..63741b69c22 100644 --- a/doc/lispref/parsing.texi +++ b/doc/lispref/parsing.texi @@ -1266,10 +1266,11 @@ example, with the following pattern: @end example @noindent -tree-sitter only matches arrays where the first element equals to -the last element. To attach a predicate to a pattern, we need to -group them together. A predicate always starts with a @samp{#}. -Currently there are two predicates, @code{#equal} and @code{#match}. +tree-sitter only matches arrays where the first element equals to the +last element. To attach a predicate to a pattern, we need to group +them together. A predicate always starts with a @samp{#}. Currently +there are three predicates, @code{#equal}, @code{#match}, and +@code{#pred}. @deffn Predicate equal arg1 arg2 Matches if @var{arg1} equals to @var{arg2}. Arguments can be either @@ -1282,6 +1283,11 @@ Matches if the text that @var{capture-name}'s node spans in the buffer matches regular expression @var{regexp}. Matching is case-sensitive. @end deffn +@deffn Predicate pred fn &rest nodes +Matches if function @var{fn} returns non-@code{nil} when passed each +node in @var{nodes} as arguments. +@end deffn + Note that a predicate can only refer to capture names that appear in the same pattern. Indeed, it makes little sense to refer to capture names in other patterns. |