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Diff for /mandoc/eqn.7 between version 1.2 and 1.9

version 1.2, 2011/03/17 15:12:42 version 1.9, 2011/07/21 13:18:24
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.
   Each equation is bracketed by
   .Sq \&.EQ
   .Sq \&.EN
   .Em Note :
   these are not the same as
   .Xr roff 7
   macros, and may only be invoked as
   .Sq \&.EQ .
 .Pp  .Pp
 For the time being,  The equation grammar is as follows:
 .Xr mandoc 1  .Bd -literal -offset indent
 reproduces the contents of  eqn     : box | eqn box
   box     : text
           | { eqn }
           | DEFINE text text
           | SET text text
           | UNDEF text
           | box mark
   text    : TEXT
   mark    : DOT
           | DOTDOT
           | HAT
           | TILDE
           | VEC
           | DYAD
           | BAR
           | UNDER
   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.
   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:
   .D1 define Ar key cvalc
   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
   .D1 define Ar foo 'bar baz'
   .D1 define Ar foo cbar bazc
   It is an error to have an empty
   .Ar key or
   .Ar val .
   Note that a quoted
   .Ar key
   causes errors in some
 .Nm  .Nm
 equations verbatim in its output.  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
 .Pp  .Pp
   Definitions can create arbitrary strings, for example, the following is
   a legal construction.
   .Bd -literal -offset indent
   define foo 'define'
   foo bar 'baz'
   Self-referencing definitions will raise an error.
   .It Cm set
   Set an equation mode.
   Both arguments are thrown away.
   Its syntax is as follows:
   .D1 set Ar key val
 The  The
   .Ar key
   .Ar val
   are not expanded for replacements.
   .It Cm undef
   Unset a previously-defined key.
   Its syntax is as follows:
   .D1 define Ar key
   Once invoked, the definition for
   .Ar key
   is discarded.
   .Ar key
   is not expanded for replacements.
   This section documents the compatibility of mandoc
 .Nm  .Nm
 implementation in  and the troff
 .Xr mandoc 1  .Nm
 is  implementation (including GNU troff).
 .Ud  .Pp
   .Bl -dash -compact
   The text string
   .Sq \e\*q
   is interpreted as a literal quote in troff.
   In mandoc, this is interpreted as a comment.
 .Xr mandoc 1 ,  .Xr mandoc 1 ,
 .Xr man 7 ,  .Xr man 7 ,
Line 75  is
Line 177  is
 .%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
   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.
 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 .

Removed from v.1.2  
changed lines
  Added in v.1.9