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Diff for /mandoc/roff.7 between version 1.52 and 1.53

version 1.52, 2014/04/05 20:34:57 version 1.53, 2014/04/07 15:07:13
Line 751  or
Line 751  or
 .Pq troff mode ,  .Pq troff mode ,
 COND evaluates to false.  COND evaluates to false.
 .It  .It
 If COND starts with a digit, optionally prefixed by a minus sign,  If COND starts with a parenthesis or with an optionally signed
 it is evaluated as a numerical expression of the form  integer number, it is evaluated according to the rules of
 .Ar number operator number ,  .Sx Numerical expressions
 where  explained below.
 .Ar operator  It evaluates to true if the the result is positive,
 is one of  or to false if the result is zero or negative.
 .Sq < ,  
 .Sq <= ,  
 .Sq = ,  
 .Sq >= ,  
 or  
 .Sq > .  
 .It  .It
 Otherwise, the first character of COND is regarded as a delimiter  Otherwise, the first character of COND is regarded as a delimiter
 and COND evaluates to true if the string extending from its first  and COND evaluates to true if the string extending from its first
Line 904  A register is an arbitrary string value that defines s
Line 898  A register is an arbitrary string value that defines s
 which influences parsing and/or formatting.  which influences parsing and/or formatting.
 Its syntax is as follows:  Its syntax is as follows:
 .Pp  .Pp
 .D1 Pf \. Cm \&nr Ar name Oo +|- Oc Ns Ar value  .D1 Pf \. Cm \&nr Ar name Oo +|- Oc Ns Ar expression
 .Pp  .Pp
 The  For the syntax of
 .Ar value  .Ar expression ,
 may, at the moment, only be an integer.  see
   .Sx Numerical expressions
   below.
 If it is prefixed by a sign, the register will be  If it is prefixed by a sign, the register will be
 incremented or decremented instead of assigned to.  incremented or decremented instead of assigned to.
 .Pp  .Pp
Line 1021  Begin a table, which formats input in aligned rows and
Line 1017  Begin a table, which formats input in aligned rows and
 See  See
 .Xr tbl 7  .Xr tbl 7
 for a description of the tbl language.  for a description of the tbl language.
   .Ss Numerical expressions
   The
   .Sx \&nr ,
   .Sx \&if ,
   and
   .Sx \&ie
   requests accept integer numerical expressions as arguments.
   These are always evaluated using the C
   .Vt int
   type; integer overflow works the same way as in the C language.
   Numbers consist of an arbitrary number of digits
   .Sq 0
   to
   .Sq 9
   prefixed by an optional sign
   .Sq +
   or
   .Sq - .
   .Pp
   The following binary operators are implemented.
   Unless otherwise stated, they behave as in the C language:
   .Pp
   .Bl -tag -width 2n -compact
   .It Ic +
   addition
   .It Ic -
   subtraction
   .It Ic *
   multiplication
   .It Ic /
   division
   .It Ic %
   remainder of division
   .It Ic <
   less than
   .It Ic >
   greater than
   .It Ic ==
   equal to
   .It Ic =
   equal to, same effect as
   .Ic ==
   (this differs from C)
   .It Ic <=
   less than or equal to
   .It Ic >=
   greater than or equal to
   .It Ic <>
   not equal to (corresponds to C
   .Ic != ;
   this one is of limited portability, it is supported by Heirloom roff,
   but not by groff)
   .It Ic &
   logical and (corresponds to C
   .Ic && )
   .It Ic \&:
   logical or (corresponds to C
   .Ic \&|| )
   .It Ic <?
   minimum (not available in C)
   .It Ic >?
   maximum (not available in C)
   .El
   .Pp
   There is no concept of precendence; evaluation proceeds from left to right,
   except when subexpressions are enclosed in parantheses.
   Inside parentheses, whitespace is ignored.
 .Sh ESCAPE SEQUENCE REFERENCE  .Sh ESCAPE SEQUENCE REFERENCE
 The  The
 .Xr mandoc 1  .Xr mandoc 1
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