diff options
Diffstat (limited to 'doc/expert/det_prec')
| -rw-r--r-- | doc/expert/det_prec | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/doc/expert/det_prec b/doc/expert/det_prec index c2dd72d..2065eb7 100644 --- a/doc/expert/det_prec +++ b/doc/expert/det_prec @@ -41,12 +41,19 @@ User-defined symbols may be given a precedence and associativity: "}" } They come just after any @Code into clause and before any parameter -definitions. The precedence may be -any whole number between 10 and 100, and if omitted is assigned the -value 100. The higher the number, the higher the precedence. The -associativity may be @Code left or {@Code right}, and if omitted -defaults to {@Code right}. Lout's symbols have the following -precedences and associativities: +definitions. The precedence may be any whole number between 10 and +100, and if omitted is assigned the value 100. The higher the number, +the higher the precedence. The associativity may be @Code left or +{@Code right}, and if omitted defaults to {@Code right}. +@PP +In the example above, the precedence and associativity are both +literal words ({@Code 50} and {@Code right}). It is also possible +to define a macro whose value is a suitable literal word, and +invoke that macro as the value of a precedence or associativity. +But arbitrary expressions, including invocations of symbols other +than macros, are not permitted. +@PP +Lout's symbols have the following precedences and associativities: @ID @Tab vmargin { 0.5vx } @Fmta { @Col @CC A ! @Col @CC B ! @Col C } |