2 '<expr>' [ DEFUN | DEFVAR | TERM ] * '</expr>'
4 TERM = [ INT | STRING | SYMBOL | LIST | VAR | FUNCALL ]
7 '<defun fname="' FNAME ? ">'
13 '<args>' FIXED ? OPTIONAL ? REST ? '</args>'
14 | '<args-unevalled>' FIXED ? OPTIONAL ? REST ? '</args-unevalled>'
17 '<fixed> VAR + '</fixed>'
20 '<optional>' VAR + '<optional>'
23 '<rest>' VAR '</rest>'
25 DEFVAR = DEFVAR-INT DEFVAR-STR DEFVAR-SYM
28 '<defvar vname="' VNAME '">'
35 <possible-value> [ INT | '<range>' INT INT '</range>' ] + </possible-value>
38 '<defvar vname"' VNAME '">'
45 <possible-value> STR + </possible-value>
48 '<defvar vname"' VNAME '">'
55 <possible-value> SYMBOL + </possible-value>
58 '<description>' [ TEXT | GETTEXT ] '</description>'
61 '<gettext>' TEXT '</gettext>'
64 '<integer>' INTEGER '</integer>'
66 '<string>' STRING '</string>'
68 '<symbol>' NAME '</symbol>'
70 '<list>' TERM * '</list>' | <list/>
73 '<varref vname="' VNAME '"/>'
76 '<funcall fname="' FNAME '">' TERM * '</funcall>'
82 | LT | LE | EQ | GE | GT | NOTEQ
83 | ADD | SUB | MUL | DIV | MOD
84 | LOGAND | LOGIOR | LOGXOR | LSH
85 | APPEND | CONCAT | LENGTH | NTH | COPY | INS | DEL
86 | PROGN | IF | WHEN | COND
87 | LOOP | WHILE | FOREACH | BREAK | RETURN
90 ;; TERM has a value, and is evaluated to a TERM as below.
91 ;; INT has an integer value, and is evaluated to itself .
92 ;; STRING has a string value, and is evaluated to itself.
93 ;; SYMBOL has a symbol value, and is evaluated to itself.
94 ;; LIST has a list value and, is evaluated to itself.
95 ;; VAR has a value of TERM that is assigned to the variable,
96 ;; and is evalued to that TERM.
97 ;; FUNCALL has a value of TERM that is returned by that function,
98 ;; and is evalued to that TERM.
100 INTTERM = INT | VAR (value is INT) | FUNCALL (return INT)
101 STRTERM = STR | VAR (value is STR) | FUNCALL (return STR)
102 SYMTERM = SYMBOL | VAR (value is SYMBOL) | FUNCALL (return SYMBOL)
103 LISTTERM = LIST | VAR (value is LIST) | FUNCALL (return LIST)
106 ;; Here after, when an argument is TERM, it is given to a function
107 ;; without being evaluted. Otherwise, an evaluated term is given.
109 SET = '<set vname="' VNAME '">' ANYTERM '</set>'
110 ADD = '<add>' INTTERM + '</add>'
111 | '<add vname="' VNAME '">' INTTERM + '</add>'
112 SUB = '<sub>' INTTERM + '</sub>'
113 | '<sub vname="' VNAME '">' INTTERM + '</sub>'
114 MUL = '<mul>' INTTERM + '</mul>'
115 | '<mul vname="' VNAME '">' INTTERM + '</mul>'
116 DIB = '<div>' INTTERM + '</div>'
117 | '<div vname="' VNAME '">' INTTERM + '</div>'
118 MOD = '<mod>' INTTERM INTTERM '</mod>'
119 | '<mod vname="' VNAME '">' INTTERM '</div>'
120 LOGAND = '<logand> INTTERM + '</logand>'
121 | '<logand vname="' VNAME '">' INTTERM + '</logand>'
122 LOGIOR = '<logior> INTTERM + '</logior>'
123 | '<logior> vname="' VNAME '">' INTTERM + '</logior>'
124 LOGXOR = '<logxor> INTTERM + '</logxor>'
125 | '<logxor> vname="' VNAME '">' INTTERM + '</logxor>'
126 LSH = '<lsh>' INTTERM INTTERM '</lsh>'
127 | '<lsh vname="' VNAME '">' INTTERM '</mul>'
128 LT = '<lt>' INTTERM INTTERM '</lt>'
129 LE = '<le>' INTTERM INTTERM '</le>'
130 EQ = '<eq>' INTTERM INTTERM '</eq>'
131 NOTEQ = '<noteq>' INTTERM INTTERM '</noteq>'
132 GE = '<ge>' INTTERM INTTERM '</ge>'
133 GT ='<gt>' INTTERM INTTERM '</gt>'
134 APPEND = '<append>' ANYTERM + '</append>'
135 CONCAT = '<concat>' [ INTTERM | STRTERM | LISTTERM ] + '</concat>'
136 LENGTH = '<length>' [ STRTERM | LISTTERM ] '</length>'
137 NTH = '<nth>' INTTERM [ STRTERM | LISTTERM ] '</nth>'
138 COPY = '<copy>' LISTTERM '</nth>'
139 INS = '<ins vname="' VNAME '">' INTTERM [ STRTERM | LISTTERM ] '</ins>'
140 DEL = '<del vname="' VNAME '">' INTTERM INTTERM '</ins>'
141 AND = '<and>' TERM + '</and>'
142 OR = '<or>' TERM + '</or>'
143 NOT = '<not>' TERM '</not>'
144 PROGN = '<progn>' TERM * '</progn>'
145 IF = '<if>' TERM TERM TERM ? '</if>'
146 WHEN = '<when>' TERM TERM * '</when>'
147 COND = '<cond>' LIST + '</cond>'
148 LOOP = '<loop>' TERM + '</loop>'
149 WHILE = '<while>' TERM + '</while>'
150 FOREACH = '<foreach vname="' VNAME '">' TERM + '</foreach>'
151 BREAK = '<break>' ANYTERM ? '</break>'
152 RETURN = '<return>' ANYTERM ? '</return>'
153 QUOTE = '<quote>' TERM '</quote>'
154 EVAL = '<eval>' TERM '</eval>'
155 TYPE = '<type>' ANYTERM '</type>'