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 '">'
31 <possible-value> [ INT | '<range>' INT INT '</range>' ] *</possible-value>
35 '<defvar vname"' VNAME '">'
38 <possible-value> STR * </possible-value>
42 '<defvar vname"' VNAME '">'
45 <possible-value> SYMBOL * </possible-value>
49 '<description>' [ TEXT | GETTEXT ] '</description>'
52 '<gettext>' TEXT '</gettext>'
55 '<integer>' INTEGER '</integer>'
57 '<string>' STRING '</string>'
59 '<symbol>' NAME '</symbol>'
61 '<list>' TERM * '</list>' | <list/>
64 '<varref vname="' VNAME '"/>'
67 '<funcall fname="' FNAME '">' TERM * '</funcall>'
73 | LT | LE | EQ | GE | GT | NOTEQ
74 | ADD | SUB | MUL | DIV | MOD
75 | LOGAND | LOGIOR | LOGXOR | LSH
76 | APPEND | CONCAT | LENGTH | NTH | COPY | INS | DEL
77 | PROGN | IF | WHEN | COND
78 | LOOP | WHILE | FOREACH | BREAK | RETURN
81 ;; TERM has a value, and is evaluated to a TERM as below.
82 ;; INT has an integer value, and is evaluated to itself .
83 ;; STRING has a string value, and is evaluated to itself.
84 ;; SYMBOL has a symbol value, and is evaluated to itself.
85 ;; LIST has a list value and, is evaluated to itself.
86 ;; VAR has a value of TERM that is assigned to the variable,
87 ;; and is evalued to that TERM.
88 ;; FUNCALL has a value of TERM that is returned by that function,
89 ;; and is evalued to that TERM.
91 INTTERM = INT | VAR (value is INT) | FUNCALL (return INT)
92 STRTERM = STR | VAR (value is STR) | FUNCALL (return STR)
93 SYMTERM = SYMBOL | VAR (value is SYMBOL) | FUNCALL (return SYMBOL)
94 LISTTERM = LIST | VAR (value is LIST) | FUNCALL (return LIST)
97 ;; Here after, when an argument is TERM, it is given to a function
98 ;; without being evaluted. Otherwise, an evaluated term is given.
100 SET = '<set vname="' VNAME '">' ANYTERM '</set>'
101 ADD = '<add>' INTTERM + '</add>'
102 | '<add vname="' VNAME '">' INTTERM + '</add>'
103 SUB = '<sub>' INTTERM + '</sub>'
104 | '<sub vname="' VNAME '">' INTTERM + '</sub>'
105 MUL = '<mul>' INTTERM + '</mul>'
106 | '<mul vname="' VNAME '">' INTTERM + '</mul>'
107 DIB = '<div>' INTTERM + '</div>'
108 | '<div vname="' VNAME '">' INTTERM + '</div>'
109 MOD = '<mod>' INTTERM INTTERM '</mod>'
110 | '<mod vname="' VNAME '">' INTTERM '</div>'
111 LOGAND = '<logand> INTTERM + '</logand>'
112 | '<logand vname="' VNAME '">' INTTERM + '</logand>'
113 LOGIOR = '<logior> INTTERM + '</logior>'
114 | '<logior> vname="' VNAME '">' INTTERM + '</logior>'
115 LOGXOR = '<logxor> INTTERM + '</logxor>'
116 | '<logxor> vname="' VNAME '">' INTTERM + '</logxor>'
117 LSH = '<lsh>' INTTERM INTTERM '</lsh>'
118 | '<lsh vname="' VNAME '">' INTTERM '</mul>'
119 LT = '<lt>' INTTERM INTTERM '</lt>'
120 LE = '<le>' INTTERM INTTERM '</le>'
121 EQ = '<eq>' INTTERM INTTERM '</eq>'
122 NOTEQ = '<noteq>' INTTERM INTTERM '</noteq>'
123 GE = '<ge>' INTTERM INTTERM '</ge>'
124 GT ='<gt>' INTTERM INTTERM '</gt>'
125 APPEND = '<append>' ANYTERM + '</append>'
126 CONCAT = '<concat>' [ INTTERM | STRTERM | LISTTERM ] + '</concat>'
127 LENGTH = '<length>' [ STRTERM | LISTTERM ] '</length>'
128 NTH = '<nth>' INTTERM [ STRTERM | LISTTERM ] '</nth>'
129 COPY = '<copy>' LISTTERM '</nth>'
130 INS = '<ins vname="' VNAME '">' INTTERM [ STRTERM | LISTTERM ] '</ins>'
131 DEL = '<del vname="' VNAME '">' INTTERM INTTERM '</ins>'
132 AND = '<and>' TERM + '</and>'
133 OR = '<or>' TERM + '</or>'
134 NOT = '<not>' TERM '</not>'
135 PROGN = '<progn>' TERM * '</progn>'
136 IF = '<if>' TERM TERM TERM ? '</if>'
137 WHEN = '<when>' TERM TERM * '</when>'
138 COND = '<cond>' LIST + '</cond>'
139 LOOP = '<loop>' TERM + '</loop>'
140 WHILE = '<while>' TERM + '</while>'
141 FOREACH = '<foreach vname="' VNAME '">' TERM + '</foreach>'
142 BREAK = '<break>' ANYTERM ? '</break>'
143 RETURN = '<return>' ANYTERM ? '</return>'
144 QUOTE = '<quote>' TERM '</quote>'
145 EVAL = '<eval>' TERM '</eval>'
146 TYPE = '<type>' ANYTERM '</type>'