mirror of
https://github.com/TheRealOwenRees/pgn_to_tex.git
synced 2026-07-23 03:56:57 +00:00
owenrees
79155255f6
* copy project root files * import previously created code and rename where needed * fix license and lint * main is now just a JS wrapper * minified main.cjs rather than copying to a newly named file
104 lines
3.2 KiB
OCaml
104 lines
3.2 KiB
OCaml
open Sedlexing
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open Parser
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let digit = [%sedlex.regexp? '0' .. '9']
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let letter = [%sedlex.regexp? 'a' .. 'z' | 'A' .. 'Z']
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let alphabetic = [%sedlex.regexp? letter]
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let move_char = [%sedlex.regexp? letter | digit | '+' | '#' | '=' | '-' | 'x']
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let piece_square_char =
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[%sedlex.regexp? 'K' | 'Q' | 'R' | 'B' | 'N' | 'O' | 'a' .. 'h']
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let clock_val = [%sedlex.regexp? Plus (digit | ':'), Opt ('.', Plus digit)]
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let rec tokenize_header buf =
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match%sedlex buf with
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| Plus white_space -> tokenize_header buf
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| ']' -> TAG_CLOSE
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| '"' -> read_string (Buffer.create 16) buf
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| letter, Star (letter | digit | '_') -> HEADER (Utf8.lexeme buf)
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| eof -> EOF
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| _ -> failwith "Unexpected character in header"
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and tokenize_game buf =
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match%sedlex buf with
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| Plus white_space -> tokenize_game buf
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| "[%clk " -> read_inline_clock buf
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| '[' -> TAG_OPEN
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| '{' -> read_comment (Buffer.create 32) buf
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| '(' -> LPAREN
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| ')' -> RPAREN
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| '$', Plus digit -> NAG (Utf8.lexeme buf)
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| Plus digit, Plus '.' -> NUMBER (Utf8.lexeme buf)
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| "1-0" | "0-1" | "1/2-1/2" | "*" -> RESULT (Utf8.lexeme buf)
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| "O-O" | "O-O-O" -> MOVE (Utf8.lexeme buf)
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| ('K' | 'Q' | 'R' | 'B' | 'N' | 'a' .. 'h'), Star move_char ->
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MOVE (Utf8.lexeme buf)
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| eof -> EOF
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| any -> tokenize_game buf
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| _ -> failwith "Unexpected character in game"
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and read_string b buf =
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match%sedlex buf with
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| '"' -> STRING (Buffer.contents b)
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| '\\', '"' ->
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Buffer.add_char b '"';
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read_string b buf
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| any ->
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Buffer.add_string b (Utf8.lexeme buf);
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read_string b buf
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| _ -> failwith "Unterminated string"
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and read_inline_clock buf =
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match%sedlex buf with
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| clock_val ->
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let time = Utf8.lexeme buf in
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begin match%sedlex buf with
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| ']' -> CLOCK time
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| _ -> failwith "Malformed inline clock: expected closing ']'"
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end
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| _ -> failwith "Malformed inline clock value"
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and read_comment b buf =
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match%sedlex buf with
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| Plus white_space -> read_comment b buf
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| "[%clk " -> read_comment_clock buf
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| "[%" -> skip_bracket_tag buf b
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| '}' -> COMMENT (Buffer.contents b)
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| eof -> failwith "Unterminated comment"
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| any ->
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Buffer.add_string b (Utf8.lexeme buf);
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read_comment_content b buf
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| _ -> failwith "Malformed comment"
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and read_comment_clock buf =
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match%sedlex buf with
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| clock_val ->
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let time = Utf8.lexeme buf in
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begin match%sedlex buf with
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| ']' -> begin
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match%sedlex buf with
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| Star white_space, '}' -> CLOCK time
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| _ -> failwith "Expected closing '}' after clock comment"
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end
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| _ -> failwith "Malformed clock in comment: expected ']'"
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end
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| _ -> failwith "Malformed clock value"
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and read_comment_content b buf =
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match%sedlex buf with
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| "[%" -> skip_bracket_tag buf b
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| '}' -> COMMENT (String.trim (Buffer.contents b))
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| eof -> failwith "Unterminated comment"
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| any ->
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Buffer.add_string b (Utf8.lexeme buf);
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read_comment_content b buf
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| _ -> failwith "Malformed comment"
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and skip_bracket_tag buf b =
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match%sedlex buf with
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| ']' -> read_comment_content b buf
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| eof -> failwith "Unterminated [% tag inside comment"
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| any -> skip_bracket_tag buf b
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| _ -> failwith "Malformed comment"
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