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| -rw-r--r-- | doc/info/mds.texinfo | 48 |
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diff --git a/doc/info/mds.texinfo b/doc/info/mds.texinfo index f06785a..c6c21ea 100644 --- a/doc/info/mds.texinfo +++ b/doc/info/mds.texinfo @@ -5176,6 +5176,7 @@ line feeds for new lines. * Layout Assumptions:: Making assumption about the keyboard layout. * Include Statement:: Including base files. * Layout Macros and Functions:: Reducing repetition. +* Escaping:: Backslashes have so many uses. @end menu @@ -5789,6 +5790,53 @@ or function takes. +@node Escaping +@subsection Escaping + +Similar to most, if not all, programming language, a +backslash inside quotes can be used to parse the next +character with special meaning. For instance, `\"' is +parsed as a literal `"', and `\\' is parsed as a literal +`\'. `\>' is too parsed as a literal `>', for example +you may need to write @code{<letter \>>}. The characters +`(', `)', `[', `]', `@{', `@}', `<' and `,' also follow +this rule to make those character accesible inside +a @code{< >}. But `\' can also be used to specify +characters by their code point, for example if you want +an `æ' you can write @code{"\u00E6"} or @code{"\uE6"}, +instead of @code{"æ"}. You can also write @code{"\0346"}, +the difference between `\0' and `\u' is that `\0' uses +octal whereas `\u' uses hexadecimal. + +`\' can also be used to access variables and parameters. +For example `\1' in + +@example +macro letter/2 + <letter \1> : "\1" + <shift letter \1> : "\2" + <caps letter \1> : "\2" + <shift caps letter \1> : "\1" +end macro +letter("å" "Å") +@end example + +is expanded to an `å', where as `\2' is expanded to an `Å'. + +`\' is also used to call functions, for example if +you want to call the function `f/0' you write +@code{\f()}. + +Because numerical (possibly prefixed with an `u') are of +variable length, it is possible to specify the escape's +termination point with a dot. For instance, if you +want the value of the first variable (\1) followed by +two zeroes, you do not write `\100' as that would expand +to the value of the hundredth variable. Instead you +write `\1.00'. + + + @node Builtin Functions @section Builtin Functions |