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Diff for /mandoc/eqn.7 between version 1.6 and 1.18

version 1.6, 2011/07/21 11:34:53 version 1.18, 2011/07/22 14:59:02
Line 59  these are not the same as
Line 59  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
         | DEFINE text text          | "{" eqn "}"
         | SET text text          | "define" text text
         | UNDEF text          | "gfont" text
           | "gsize" text
           | "set" text text
           | "undef" text
           | box pos box
           | box mark
           | pile "{" list "}"
           | font box
           | "size" text box
           | "left" text eqn ["right" text]
 text    : TEXT  text    : TEXT
   pile    : "lpile" | "cpile" | "rpile"
   pos     : "over" | "sup" | "sub" | "to" | "from"
   mark    : "dot" | "dotdot" | "hat" | "tilde" | "vec"
           | "dyad" | "bar" | "under"
   font    : "roman" | "italic" | "bold"
   list    : eqn
           | list "above" eqn
 .Ed  .Ed
 .Pp  .Pp
 Data in TEXT form is a non-empty sequence of non-space characters or a  Data in TEXT form is a non-empty sequence of non-space characters or a
Line 75  Unless within a quoted string, white-space (and enclos
Line 92  Unless within a quoted string, white-space (and enclos
 pairs) is thrown away.  pairs) is thrown away.
 Quoted strings are 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 100  Note that a quoted
Line 130  Note that a quoted
 causes errors in some  causes errors in some
 .Nm  .Nm
 implementations and should not be considered portable.  implementations and should not be considered portable.
   It is not expanded for replacements.
 Definitions may refer to other definitions; these are evaluated  Definitions may refer to other definitions; these are evaluated
 recursively when text replacement occurs and not when the definition is  recursively when text replacement occurs and not when the definition is
 created.  created.
Line 112  foo bar 'baz'
Line 143  foo bar 'baz'
 .Ed  .Ed
 .Pp  .Pp
 Self-referencing definitions will raise an error.  Self-referencing definitions will raise an error.
   .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:
   .Pp
   .D1 set Ar key val
   .Pp
   The
   .Ar key
   and
   .Ar val
   are not expanded for replacements.
 .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 124  Its syntax is as follows:
Line 180  Its syntax is as follows:
 Once invoked, the definition for  Once invoked, the definition for
 .Ar key  .Ar key
 is discarded.  is discarded.
   The
   .Ar key
   is not expanded for replacements.
 .El  .El
 .Sh COMPATIBILITY  .Sh COMPATIBILITY
 This section documents the compatibility of mandoc  This section documents the compatibility of mandoc
Line 167  In mandoc, this is interpreted as a comment.
Line 226  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.

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Removed from v.1.6  
changed lines
  Added in v.1.18

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