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Diff for /mandoc/eqn.7 between version 1.9 and 1.26

version 1.9, 2011/07/21 13:18:24 version 1.26, 2011/08/18 08:58:43
Line 30  and
Line 30  and
 .Xr man 7  .Xr man 7
 .Ux  .Ux
 manual pages.  manual pages.
 This manual describes the subset of the  It describes the
   .Em structure
   of an equation, not its mathematical meaning.
   This manual describes the
 .Nm  .Nm
 language accepted by the  language accepted by the
 .Xr mandoc 1  .Xr mandoc 1
 utility.  utility, which correspond to the Second Edition eqn specification (see
   .Sx SEE ALSO
   for references).
 .Pp  .Pp
 Equations within  Equations within
 .Xr mdoc 7  .Xr mdoc 7
Line 59  these are not the same as
Line 64  these are not the same as
 macros, and may only be invoked as  macros, and may only be invoked as
 .Sq \&.EQ .  .Sq \&.EQ .
 .Pp  .Pp
 The equation grammar is as follows:  The equation grammar is as follows, where quoted strings are
   case-sensitive literals in the input:
 .Bd -literal -offset indent  .Bd -literal -offset indent
 eqn     : box | eqn box  eqn     : box | eqn box
 box     : text  box     : text
         | { eqn }          | \*q{\*q eqn \*q}\*q
         | DEFINE text text          | \*qdefine\*q text text
         | SET text text          | \*qndefine\*q text text
         | UNDEF text          | \*qtdefine\*q text text
           | \*qgfont\*q text
           | \*qgsize\*q text
           | \*qset\*q text text
           | \*qundef\*q text
           | box pos box
         | box mark          | box mark
 text    : TEXT          | \*qmatrix\*q \*q{\*q [col \*q{\*q list \*q}\*q ]*
 mark    : DOT          | pile \*q{\*q list \*q}\*q
         | DOTDOT          | font box
         | HAT          | \*qsize\*q text box
         | TILDE          | \*qleft\*q text eqn [\*qright\*q text]
         | VEC  col     : \*qlcol\*q | \*qrcol\*q | \*qccol\*q | \*qcol\*q
         | DYAD  text    : [^space\e\*q]+ | \e\*q.*\e\*q
         | BAR  pile    : \*qlpile\*q | \*qcpile\*q | \*qrpile\*q | \*qpile\*q
         | UNDER  pos     : \*qover\*q | \*qsup\*q | \*qsub\*q | \*qto\*q | \*qfrom\*q
   mark    : \*qdot\*q | \*qdotdot\*q | \*qhat\*q | \*qtilde\*q | \*qvec\*q
           | \*qdyad\*q | \*qbar\*q | \*qunder\*q
   font    : \*qroman\*q | \*qitalic\*q | \*qbold\*q | \*qfat\*q
   list    : eqn
           | list \*qabove\*q eqn
   space   : [\e^~ \et]
 .Ed  .Ed
 .Pp  .Pp
 Data in TEXT form is a non-empty sequence of non-space characters or a  White-space consists of the space, tab, circumflex, and tilde
 non-empty quoted string.  characters.
 Unless within a quoted string, white-space (and enclosing literal quote  If within a quoted string, these space characters are retained.
 pairs) is thrown away.  Quoted strings are also not scanned for replacement definitions.
 Quoted strings are not scanned for replacement definitions.  
 .Pp  .Pp
   The following text terms are translated into a rendered glyph, if
   available: alpha, beta, chi, delta, epsilon, eta, gamma, iota, kappa,
   lambda, mu, nu, omega, omicron, phi, pi, psi, rho, sigma, tau, theta,
   upsilon, xi, zeta, DELTA, GAMMA, LAMBDA, OMEGA, PHI, PI, PSI, SIGMA,
   THETA, UPSILON, XI, inter (intersection), union (union), prod (product),
   int (integral), sum (summation), grad (gradient), del (vector
   differential), times (multiply), cdot (centre-dot), nothing (zero-width
   space), approx (approximately equals), prime (prime), half (one-half),
   partial (partial differential), inf (infinity), >> (much greater), <<
   (much less), \-> (left arrow), <\- (right arrow), += (plus-minus), !=
   (not equal), == (equivalence), <= (less-than-equal), and >=
   (more-than-equal).
   .Pp
 The following control statements are available:  The following control statements are available:
 .Bl -tag -width Ds  .Bl -tag -width Ds
 .It Cm define  .It Cm define
Line 123  foo bar 'baz'
Line 152  foo bar 'baz'
 .Ed  .Ed
 .Pp  .Pp
 Self-referencing definitions will raise an error.  Self-referencing definitions will raise an error.
   The
   .Cm ndefine
   statement is a synonym for
   .Cm define ,
   while
   .Cm tdefine
   is discarded.
   .It Cm gfont
   Set the default font of subsequent output.
   Its syntax is as follows:
   .Pp
   .D1 gfont Ar font
   .Pp
   In mandoc, this value is discarded.
   .It Cm gsize
   Set the default size of subsequent output.
   Its syntax is as follows:
   .Pp
   .D1 gsize Ar size
   .Pp
   The
   .Ar size
   value should be an integer.
 .It Cm set  .It Cm set
 Set an equation mode.  Set an equation mode.
 Both arguments are thrown away.  In mandoc, both arguments are thrown away.
 Its syntax is as follows:  Its syntax is as follows:
 .Pp  .Pp
 .D1 set Ar key val  .D1 set Ar key val
Line 135  The
Line 187  The
 and  and
 .Ar val  .Ar val
 are not expanded for replacements.  are not expanded for replacements.
   This statement is a GNU extension.
 .It Cm undef  .It Cm undef
 Unset a previously-defined key.  Unset a previously-defined key.
 Its syntax is as follows:  Its syntax is as follows:
Line 147  is discarded.
Line 200  is discarded.
 The  The
 .Ar key  .Ar key
 is not expanded for replacements.  is not expanded for replacements.
   This statement is a GNU extension.
 .El  .El
 .Sh COMPATIBILITY  .Sh COMPATIBILITY
 This section documents the compatibility of mandoc  This section documents the compatibility of mandoc
Line 161  The text string
Line 215  The text string
 .Sq \e\*q  .Sq \e\*q
 is interpreted as a literal quote in troff.  is interpreted as a literal quote in troff.
 In mandoc, this is interpreted as a comment.  In mandoc, this is interpreted as a comment.
   .It
   In troff, The circumflex and tilde white-space symbols map to
   fixed-width spaces.
   In mandoc, these characters are synonyms for the space character.
   .It
   The troff implementation of
   .Nm
   allows for equation alignment with the
   .Cm mark
   and
   .Cm lineup
   tokens.
   mandoc discards these tokens.
   The
   .Cm back Ar n ,
   .Cm fwd Ar n ,
   .Cm up Ar n ,
   and
   .Cm down Ar n
   commands are also ignored.
 .El  .El
 .Sh SEE ALSO  .Sh SEE ALSO
 .Xr mandoc 1 ,  .Xr mandoc 1 ,
Line 190  In mandoc, this is interpreted as a comment.
Line 264  In mandoc, this is interpreted as a comment.
 .%D 1978  .%D 1978
 .Re  .Re
 .Sh HISTORY  .Sh HISTORY
 The eqn utility, a preprocessor for troff, was originally written by  The eqn utility, a preprocessor for troff, was originally written by
 Brian W. Kernighan and Lorinda L. Cherry in 1975.  Brian W. Kernighan and Lorinda L. Cherry in 1975.
 The GNU reimplementation of eqn, part of the GNU troff package, was  The GNU reimplementation of eqn, part of the GNU troff package, was
 released in 1989 by James Clark.  released in 1989 by James Clark.
Line 201  was added in 2011.
Line 275  was added in 2011.
 This  This
 .Nm  .Nm
 reference was written by  reference was written by
 .An Kristaps Dzonsons Aq kristaps@bsd.lv .  .An Kristaps Dzonsons ,
   .Mt kristaps@bsd.lv .

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  Added in v.1.26

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