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Diffstat (limited to 'doc/m4.texinfo')
| -rw-r--r-- | doc/m4.texinfo | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/doc/m4.texinfo b/doc/m4.texinfo index a5ae162a..dcc6a2da 100644 --- a/doc/m4.texinfo +++ b/doc/m4.texinfo @@ -7,6 +7,8 @@ @include version.texi +@set beta + @ifinfo @format START-INFO-DIR-ENTRY @@ -86,9 +88,19 @@ subsequent changes by Fran@,{c}ois Pinard and other volunteers on the Internet. All names and email addresses can be found in the file @file{THANKS} from the GNU @code{m4} distribution. +@ifclear beta This is release @value{VERSION}. It is now to be considered stable, future releases are only meant to fix bugs, increase speed, or improve documentation. However@dots{} +@end ifclear + +@ifset beta +This is BETA release @value{VERSION}. This is a development release, +and is as such prone to bugs, crashes, unforeseen features, incomplete +documentation, @dots{} therefore, use at your own peril. In case of +problems, please do not hesitate to report them (see the README file in +the distribution). +@end ifset @menu * Preliminaries:: Introduction and preliminaries @@ -2043,6 +2055,10 @@ Default is all characters expect those in the categories above. @item Active Characters that themselves, alone, form macro names. No default. +@item Escape +Characters that must precede macro names for them to be recognised. No +default. + @end table @noindent @@ -2100,6 +2116,8 @@ Close parenthesis Argument separator @item O Other +@item @@ +Escape @item A Active @item L @@ -2164,6 +2182,42 @@ test(a, b, c) It is not yet possible to redefine the @samp{$} used to indicate macro arguments in user defined macros. +Macro calls can be given a @TeX{}- or texinfo like syntax using an +escape. If one or more characters are defined as escapes macro names +are only recognised if preceded by an escape character. + +If the escape is not followed by what is normally a word (a letter +optionally followed by letters and/or numerals), that single character +is returned as a macro name. + +As always, words without a macro definition cause no error message. +They and the escape character are simply output. + +@example +define(`foo', `bar') +@result{} +changesyntax(`@@@@') +@result{} +foo +@result{}foo +@@foo +@result{}bar +@@changesyntax(`@@\', `O@@') +@result{} +foo +@result{}foo +@@foo +@result{}@@foo +\foo +@result{}bar +define(`#', `No comment') +@result{}define(#, No comment) +\define(`#', `No comment') +@result{} +\# \foo # Comment \foo +@result{}No comment bar # Comment \foo +@end example + Active characters are known from @TeX{}. In @code{m4} a active character is always seen as a one-letter word, and so, if it has a macro definition, the macro will be called. |