+The equation grammar is as follows, where quoted strings are
+case-sensitive literals in the input:
+.Bd -literal -offset indent
+eqn : box | eqn box
+box : text
+ | \*q{\*q eqn \*q}\*q
+ | \*qdefine\*q text text
+ | \*qndefine\*q text text
+ | \*qtdefine\*q text text
+ | \*qgfont\*q text
+ | \*qgsize\*q text
+ | \*qset\*q text text
+ | \*qundef\*q text
+ | \*qsqrt\*q box
+ | box pos box
+ | box mark
+ | \*qmatrix\*q \*q{\*q [col \*q{\*q list \*q}\*q ]*
+ | pile \*q{\*q list \*q}\*q
+ | font box
+ | \*qsize\*q text box
+ | \*qleft\*q text eqn [\*qright\*q text]
+col : \*qlcol\*q | \*qrcol\*q | \*qccol\*q | \*qcol\*q
+text : [^space\e\*q]+ | \e\*q.*\e\*q
+pile : \*qlpile\*q | \*qcpile\*q | \*qrpile\*q | \*qpile\*q
+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
+.Pp
+White-space consists of the space, tab, circumflex, and tilde
+characters.
+It is required to delimit tokens consisting of alphabetic characters
+and it is ignored at other places.
+Braces and quotes also delimit tokens.
+If within a quoted string, these space characters are retained.
+Quoted strings are also not scanned for keywords, glyph names,
+and expansion of definitions.
+To print a literal quote character, it can be prepended with a
+backslash or expressed with the \e(dq escape sequence.
+.Pp
+Subequations can be enclosed in braces to pass them as arguments
+to operation keywords, overriding standard operation precedence.
+Braces can be nested.
+To set a brace verbatim, it needs to be enclosed in quotes.
+.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).
+The character escape sequences documented in
+.Xr mandoc_char 7
+can be used, too.
+.Pp
+The following control statements are available:
+.Bl -tag -width Ds
+.It Cm define
+Replace all occurrences of a key with a value.
+Its syntax is as follows:
+.Pp
+.D1 Cm 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 Cm define Ar foo 'bar baz'
+.D1 Cm 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
git.ckatri.com / mandoc.git / blobdiff