mirror of
https://github.com/Ed94/metadesk.git
synced 2026-07-28 02:10:04 +00:00
Miguel Lechon
c5d88b890b
Delimiters: Square brackets and parentheses. Separators: Commas and semicolons
77 lines
3.5 KiB
Markdown
77 lines
3.5 KiB
Markdown
/* MetaDesk grammar with semantic annotations
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*
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* Each line represents a BNF-esque production:
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* symbol : rule_1 | ... | rule_n
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* - Pipe signs indicate mutually exclusive alternatives
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* - Square quotes denote optional rules
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* - Character literals are terminal productions
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* - Tags indicate which way the productions attach to the generated tree (@child, @sibling, @tag)
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* and miscellaneous semantics (@fill, @markup)
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*/
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file : [@child file_set_list]
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file_set_list : { [tag_list] set [file_set_separator @sibling file_set_list] }
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file_set_separator : ' ' | '\n'
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// TODO(mal): Unify file_set_separator and set_separator by allowing ',' and ';' everywhere
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set_list : { [tag_list] set [set_separator @sibling file_set_list] }
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set_separator : ' ' | '\n' | ',' | ';'
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// TODO(mal): Accept other open/close tokens
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tag_list : '@' @tag tag ' ' [tag_list]
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tag : identifier [@markup '(' [@child set_list] @markup ')']
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set : @fill leaf | @fill identifier ':' @child @fill leaf | [@fill identifier ':'] set_open [@child set_list] set_close
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set_open : '{' | '[' | '('
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set_close : '}' | ']' | ')'
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leaf : identifier | integer_literal | char_literal | string_literal // TODO(mal): Also symbol_label
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identifier : alpha [alphanumeric] | '_' [alphanumeric]
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alphanumeric : alpha [alphanumeric] | digit [alphanumeric] | '_' [alphanumeric]
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integer_literal : { ['-'] natural_literal }
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natural_literal : digit [natural_literal]
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char_literal : @markup '\'' [char_literal_items] @markup '\''
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char_literal_items : char_literal_item [char_literal_items]
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char_literal_item : ascii_no_backslash_no_quotes | '"' | '\\' ascii
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ascii : ascii_no_backslash_no_quotes | '\'' | '"' | '\\'
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ascii_no_backslash_no_quotes : digit | alpha | symbol_no_backslash_no_quotes | space
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symbol_no_backslash_no_quotes : symbol_no_backslash_no_quotes_1 | symbol_no_backslash_no_quotes_2
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symbol_no_backslash_no_quotes_1 : '!'|'#'|'$'|'%'|'&'|'('|')'|'*'|'+'|','|'-'|'.'|'/'|':'|';'
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symbol_no_backslash_no_quotes_2 : '<'|'='|'>'|'?'|'@'|'['|']'|'^'|'_'|'`'|'{'|'|'|'}'|'~'
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string_literal : @markup '"' [string_literal_items] @markup '"'
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string_literal_items : string_literal_item [string_literal_items]
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string_literal_item : ascii_no_backslash_no_quotes | '\'' | '\\' ascii
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digit : '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
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alpha : lowercase | uppercase
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lowercase : 'a'|'b'|'c'|'d'|'e'|'f'|'g'|'h'|'i'|'j'|'k'|'l'|'m'|'n'|'o'|'p'|'q'|'r'|'s'|'t'|'u'|'v'|'w'|'z'|'y'|'z'
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uppercase : 'A'|'B'|'C'|'D'|'E'|'F'|'G'|'H'|'I'|'J'|'K'|'L'|'M'|'N'|'O'|'P'|'Q'|'R'|'S'|'T'|'U'|'V'|'W'|'Z'|'Y'|'Z'
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space : ' '
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symbol_label : '~'|'!'|'%'|'^'|'&'|'*'|'+'|'-'|'/'|'|'|'<'|'>'|'$'|'='|'.'|'?'|'_'|'\\'
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/*
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symbol_no_quote : symbol_label | symbol_colon | symbol_group
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symbol : symbol_label | symbol_colon | symbol_group
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symbol_group : symbol_open | symbol_close
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symbol_open : '(' | '[' | '{'
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symbol_close : ')' | ']' | '}'
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escaped_char : '\\' '\\' | '\\' '\'' | '\\' '\"'
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symbol_colon : ':'
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*/
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/*
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// NOTE(mal): This is the simplest subset of the grammar that works
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file : [@child set_list]
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set_list : set ['\n' @sibling set_list]
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set : @fill element | '{' [@child set_list] '}'
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element : 'A'
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*/
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