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Diff for /mandoc/eqn.7 between version 1.1 and 1.8

version 1.1, 2011/02/09 10:03:02 version 1.8, 2011/07/21 12:34:09
Line 40  Equations within
Line 40  Equations within
 .Xr mdoc 7  .Xr mdoc 7
 or  or
 .Xr man 7  .Xr man 7
 are enclosed by the  documents are enclosed by the standalone
 .Sq EQ  .Sq \&.EQ
 and  and
 .Sq EN  .Sq \&.EN
 macro tags, whose precise syntax is documented in  tags.
 .Xr roff 7 .  Equations are multi-line blocks consisting of formulas and control
 Equations consist of multi-line equation data.  statements.
   .Sh EQUATION STRUCTURE
   Each equation is bracketed by
   .Sq \&.EQ
   and
   .Sq \&.EN
   strings.
   .Em Note :
   these are not the same as
   .Xr roff 7
   macros, and may only be invoked as
   .Sq \&.EQ .
   .Pp
   The equation grammar is as follows:
   .Bd -literal -offset indent
   eqn     : box | eqn box
   box     : text
           | { eqn }
           | DEFINE text text
           | SET text text
           | UNDEF text
   text    : TEXT
   .Ed
   .Pp
   Data in TEXT form is a non-empty sequence of non-space characters or a
   non-empty quoted string.
   Unless within a quoted string, white-space (and enclosing literal quote
   pairs) is thrown away.
   Quoted strings are not scanned for replacement definitions.
   .Pp
   The following control statements are available:
   .Bl -tag -width Ds
   .It Cm define
   Replace all occurances of a key with a value.
   Its syntax is as follows:
   .Pp
   .D1 define Ar key cvalc
   .Pp
   The first character of the value string,
   .Ar c ,
   is used as the delimiter for the value
   .Ar val .
   This allows for arbitrary enclosure of terms (not just quotes), such as
   .Pp
   .D1 define Ar foo 'bar baz'
   .D1 define Ar foo cbar bazc
   .Pp
   It is an error to have an empty
   .Ar key or
   .Ar val .
   Note that a quoted
   .Ar key
   causes errors in some
   .Nm
   implementations and should not be considered portable.
   It is not expanded for replacements.
   Definitions may refer to other definitions; these are evaluated
   recursively when text replacement occurs and not when the definition is
   created.
   .Pp
   Definitions can create arbitrary strings, for example, the following is
   a legal construction.
   .Bd -literal -offset indent
   define foo 'define'
   foo bar 'baz'
   .Ed
   .Pp
   Self-referencing definitions will raise an error.
   .It Cm set
   Set an equation mode.
   Both arguments are thrown away.
   Its syntax is as follows:
   .Pp
   .D1 set Ar key val
   .Pp
   The
   .Ar key
   and
   .Ar val
   are not expanded for replacements.
   .It Cm undef
   Unset a previously-defined key.
   Its syntax is as follows:
   .Pp
   .D1 define Ar key
   .Pp
   Once invoked, the definition for
   .Ar key
   is discarded.
   The
   .Ar key
   is not expanded for replacements.
   .El
   .Sh COMPATIBILITY
   This section documents the compatibility of mandoc
   .Nm
   and the troff
   .Nm
   implementation (including GNU troff).
   .Pp
   .Bl -dash -compact
   .It
   The text string
   .Sq \e\*q
   is interpreted as a literal quote in troff.
   In mandoc, this is interpreted as a comment.
   .El
 .Sh SEE ALSO  .Sh SEE ALSO
 .Xr mandoc 1 ,  .Xr mandoc 1 ,
 .Xr man 7 ,  .Xr man 7 ,
Line 62  Equations consist of multi-line equation data.
Line 168  Equations consist of multi-line equation data.
 .%P 151\(en157  .%P 151\(en157
 .%D March, 1975  .%D March, 1975
 .Re  .Re
 .\" .Sh HISTORY  .Rs
 .\" The tbl utility, a preprocessor for troff, was originally written by M.  .%A Brian W. Kernighan
 .\" E. Lesk at Bell Labs in 1975.  .%A Lorinda L. Cherry
 .\" The GNU reimplementation of tbl, part of the groff package, was released  .%T Typesetting Mathematics, User's Guide
 .\" in 1990 by James Clark.  .%D 1976
 .\" A standalone tbl implementation was written by Kristaps Dzonsons in  .Re
 .\" 2010.  .Rs
 .\" This formed the basis of the implementation that is part of the  .%A Brian W. Kernighan
 .\" .Xr mandoc 1  .%A Lorinda L. Cherry
 .\" utility.  .%T Typesetting Mathematics, User's Guide (Second Edition)
   .%D 1978
   .Re
   .Sh HISTORY
   The eqn utility, a preprocessor for troff, was originally written by
   Brian W. Kernighan and Lorinda L. Cherry in 1975.
   The GNU reimplementation of eqn, part of the GNU troff package, was
   released in 1989 by James Clark.
   The eqn component of
   .Xr mandoc 1
   was added in 2011.
 .Sh AUTHORS  .Sh AUTHORS
 This partial  This
 .Nm  .Nm
 reference was written by  reference was written by
 .An Kristaps Dzonsons Aq kristaps@bsd.lv .  .An Kristaps Dzonsons Aq kristaps@bsd.lv .

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