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JSON5 grammar expressed in EBNF form.
PS: I don't know what is appropriate syntax highlighter for this, so I'm using "modula2" because why not. I also inserted <ZWSP> after backslash to preserve syntax highlighting, this character has nothing to do with actual JSON5 syntax and should be ignored.
```modula2
json5_text = expression_with_whitespace
expression_with_whitespace = [white_space] , expression , [white_space]
expression = literal
| array_literal
| object_literal
literal = null_literal
| boolean_literal
| signed_numeric_literal
| string_literal
null_literal = 'null'
boolean_literal = 'true'
| 'false'
(* Source Characters *)
source_character = .
(* any Unicode code unit *)
line_terminator = <LF>
| <CR>
| <LS>
| <PS>
line_terminator_sequence = <LF>
| <CR>
| <LS>
| <PS>
| <CR> , <LF>
white_space = white_space_element
| white_space , white_space_element
white_space_element = white_space_character
| comment
white_space_character = <TAB>
| <VT>
| <FF>
| <SP>
| <NBSP>
| <BOM>
| <USP>
comment = multi_line_comment
| single_line_comment
multi_line_comment = '/*' , [multi_line_comment_chars] , '*/'
multi_line_comment_chars = (source_character - '*') , [multi_line_comment_chars]
| '*' , [post_asterisk_comment_chars]
post_asterisk_comment_chars = (source_character - ('*' | '/')) , [multi_line_comment_chars]
| '*' , [post_asterisk_comment_chars]
single_line_comment = '//' , [single_line_comment_chars]
single_line_comment_chars = single_line_comment_char , single_line_comment_chars
single_line_comment_char = source_character - line_terminator
(* Character classes *)
decimal_digit = '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9'
non_zero_digit = decimal_digit - '0'
hex_digit = '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9' | 'a'
| 'b' | 'c' | 'd' | 'e' | 'f' | 'A' | 'B' | 'C' | 'D' | 'E' | 'F'
ascii_letter = ascii_letter_lowercase
| ascii_letter_uppercase
ascii_letter_lowercase = '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'
ascii_letter_uppercase = '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'
(* Numeric Literals *)
signed_numeric_literal = '-' , numeric_literal
| '+' , numeric_literal
| numeric_literal
numeric_literal = decimal_literal
| hex_integer_literal
| non_finite_literal
non_finite_literal = 'Infinity'
| 'NaN'
decimal_literal = decimal_integer_literal , '.' , [decimal_digits] , [exponent_part]
| '.' , decimal_digits , [exponent_part]
| decimal_integer_literal , [exponent_part]
decimal_integer_literal = '0'
| non_zero_digit , [decimal_digits]
decimal_digits = decimal_digit
| decimal_digits , decimal_digit
exponent_part = exponent_indicator , signed_integer
exponent_indicator = 'e' | 'E'
signed_integer = decimal_digits
| '+' , decimal_digits
| '-' , decimal_digits
hex_integer_literal = '0x' , hex_digit
| '0X' , hex_digit
| hex_integer_literal , hex_digit
(* String Literals *)
string_literal = '"' , [double_string_characters] , '"'
| "'" , [single_string_characters] , "'"
double_string_characters = double_string_character , [double_string_characters]
single_string_characters = single_string_character , [single_string_characters]
double_string_character = source_character - ('"' | '\' | line_terminator)
| '\' , escape_sequence
| line_continuation
single_string_character = source_character - ("'" | '\' | line_terminator)
| '\' , escape_sequence
| line_continuation
line_continuation = '\' , line_terminator_sequence
escape_sequence = character_escape_sequence
| '0'
| hex_escape_sequence
| unicode_escape_sequence
character_escape_sequence = single_escape_character
| non_escape_character
single_escape_character = '"' | "'" | '\' | 'b' | 'f' | 'n' | 'r' | 't' | 'v'
non_escape_character = source_character - (escape_character | line_terminator)
escape_character = single_escape_character
| decimal_digit
| 'x'
| 'u'
hex_escape_sequence = 'x' , hex_digit , hex_digit
unicode_escape_sequence = 'u' , hex_digit , hex_digit , hex_digit , hex_digit
(* Array Literals *)
array_literal = '[' , [white_space] , ']'
| '[' , [white_space] , element_list , ']'
| '[' , [white_space] , element_list , ',' , [white_space] , ']'
element_list = expression , [white_space]
| element_list , ',' , [white_space] , expression , [white_space]
(* Object Literals *)
object_literal = '{' , [white_space] , '}'
| '{' , [white_space] , property_name_and_value_list , '}'
| '{' , [white_space] , property_name_and_value_list , ',' , '}'
property_name_and_value_list = property_assignment , [white_space]
| property_name_and_value_list , [white_space] , ',' , [white_space] , property_assignment , [white_space]
property_assignment = property_name , [white_space] , ':' , [white_space] , expression
property_name = identifier_name
| string_literal
| numeric_literal
identifier_name = identifier_start
| identifier_name , identifier_part
identifier_start = unicode_letter
| '$'
| '_'
| '\' , unicode_escape_sequence
identifier_part = identifier_start
| unicode_combining_mark
| unicode_digit
| unicode_connector_punctuation
| <ZWNJ>
| <ZWJ>
unicode_letter = ascii_letter
(* + any character in the Unicode categories "Uppercase letter (Lu)", "Lowercase letter (Ll)", "Titlecase letter (Lt)", "Modifier letter (Lm)", "Other letter (Lo)", or "Letter number (Nl)" *)
unicode_combining_mark =
(* + any character in the Unicode categories "Non-spacing mark (Mn)" or "Combining spacing mark (Mc)" *)
unicode_digit = decimal_digit
(* + any character in the Unicode category "Decimal number (Nd)" *)
unicode_connector_punctuation =
(* + any character in the Unicode category "Connector punctuation (Pc)" *)
```
|
