Programming Language REXX - The Rexx Language Association

ANSI X3J18-199X
operator_or_other := '/' | '*'
operator_char := operator_only | operator_or_other
general_letter := '_' | '!' | '?' | extra_letter | 'A'
| 'B' | 'C' | 'D' | 'E' | 'F' | 'G'
| 'H' | 'I' | 'J' | 'K' | 'L' | 'M'
| 'N' | 'O' | 'P' | 'Q' | 'R' | 'S'
| 'T' | 'U' | 'V' | 'W' | 'X' | 'Y'
| 'Z' | 'a' | 'b' | 'c' | 'd' | 'e'
| 'f' | 'g' | 'h' | 'i' | 'j' | 'k'
| 'l' | 'm' | 'n' | 'o' | 'p' | 'q'
| 'r' | 's' | 't' | 'u' | 'v' | 'w'
| 'x' | 'y' | 'z'
blank := ' ' | other_blank_character
bo := [blank+]
string_or_comment_char := digit | '.' | special | operator_only
| general_letter | blank
| other_character
tokenize := [between+] [tokenbetween+] EOS Eos
tokenbetween := token [between+]
token := operand | Operator | Special
operand := string_literal | Var_symbol
| Const_symbol
between := comment | blank_run Blank | EOL Eol
| Msg13.1
blank_run := (blank | continuation)+
continuation := CONTINUE ',' [(comment | blank)+] EOL
comment := '/' '*' [commentpart+] ['*'+] ('*' '/'
| EOS Msg6.1)
commentpart := comment | ['/'+] comment_char+
| '*'+ comment_char+
comment_char := string_or_comment_char | '"' | "'"
| EOL
string_literal := Hex_string | Binary_string | String
String := quoted_string
Hex_string := quoted_string RADIX ('x' | 'X')
Binary_string := quoted_string RADIX ('b' | 'B')
quoted_string := quotation_mark_string
[(Embedded_quotation_mark
quotation_mark_string)+]
| apostrophe_string
[(Embedded_apostrophe
apostrophe_string)+]
quotation_mark_string := '"' [(string_char | "'")+]
('"' | EOL Msg6.3)
apostrophe_string := "'" [(string_char | '"')+]
("'" | EOL Msg6.2)
string_char := string_or_comment_char | '*' | '/'
Var_symbol := general_letter [var_symbol_char+]
var_symbol_char := general_letter | digit | '.'
Const_symbol := (digit | '.') [const_symbol_char+]
const_symbol_char := var_symbol_char
| EXPONENT_SIGN ('+' | '-')
(6.2.2.5)
(6.2.2.6)
(6.2.2.7)
(6.2.2.8)
(6.2.2.9)
(6.2.2.10)
(6.2.2.11)
(6.2.2.12)
(6.2.2.13)
(6.2.2.14)
(6.2.2.15)
(6.2.2.16)
(6.2.2.17)
(6.2.2.18)
(6.2.2.19)
(6.2.2.20)
(6.2.2.21)
(6.2.2.22)
(6.2.2.23)
(6.2.2.24)
(6.2.2.25)
(6.2.2.26)
(6.2.2.27)
(6.2.2.28)
(6.2.2.29)
(6.2.2.30)
(6.2.2.31)
(6.2.2.32)
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