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-rw-r--r--lib/lexer.ml212
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diff --git a/lib/lexer.ml b/lib/lexer.ml
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index c643577..0000000
--- a/lib/lexer.ml
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-(**
- Lexer using sedlex
- *)
-
-open Tokens
-
-exception UnclosedQuote of { content : string; line : int }
-exception LexError of Lexing.position * string
-exception EOF
-
-let pp_pos out { Lexing.pos_lnum; pos_cnum; pos_bol; _ } =
- Format.fprintf out "line %d:%d" pos_lnum (pos_cnum - pos_bol)
-
-(* Extract the location name from the pattern *)
-let location_name = Str.regexp {|.* \(.*\)|}
-
-let build_ident buffer =
- let id = Lexbuf.content buffer |> String.uppercase_ascii in
- try
- let value = Hashtbl.find Idents.keyword_table id in
- let _ =
- match value with IF | ELIF -> Lexbuf.incr_level buffer | _ -> ()
- in
- value
- with Not_found -> IDENT id
-
-let wait_balance : (Buffer.t -> Lexbuf.t -> 'a) -> Lexbuf.t -> 'a =
- fun rule lexbuf ->
- let _, position = Lexbuf.positions lexbuf in
- Lexbuf.set_start_position lexbuf position;
-
- try[@warning "-52"]
- let token = rule (Buffer.create 256) lexbuf in
- token
- with Failure "lexing: empty token" ->
- let position, _ = Lexbuf.positions lexbuf in
- let line = position.Lexing.pos_lnum and content = Lexbuf.content lexbuf in
- (raise (UnclosedQuote { line; content }) [@warning "+52"])
-
-let space = [%sedlex.regexp? ' ' | '\t']
-let eol = [%sedlex.regexp? '\r' | '\n' | "\r\n"]
-let coma = [%sedlex.regexp? ',']
-let digit = [%sedlex.regexp? '0' .. '9']
-let letters = [%sedlex.regexp? 'a' .. 'z' | 'A' .. 'Z' | '_']
-let spaces = [%sedlex.regexp? Plus space]
-let ident = [%sedlex.regexp? ('$' | letters), Star (digit | letters)]
-let location_ident = [%sedlex.regexp? letters | digit]
-let location_prefix = [%sedlex.regexp? '!' | '$' | '#' | '^']
-let location = [%sedlex.regexp? Opt location_prefix, Plus location_ident]
-
-let rec read_long_string level buf buffer =
- let lexbuf = Lexbuf.buffer buffer in
- match%sedlex lexbuf with
- | '{' ->
- Buffer.add_string buf (Sedlexing.Utf8.lexeme lexbuf);
- read_long_string (level + 1) buf buffer
- | '}' -> (
- match level with
- | 0 -> Buffer.contents buf
- | _ ->
- Buffer.add_string buf (Sedlexing.Utf8.lexeme lexbuf);
- read_long_string (level - 1) buf buffer)
- | eol ->
- Buffer.add_string buf (Lexbuf.content buffer);
- read_long_string level buf buffer
- | any ->
- Buffer.add_string buf (Lexbuf.content buffer);
- read_long_string level buf buffer
- | _ -> raise Not_found
-
-let rec read_dquoted_string buf buffer =
- let lexbuf = Lexbuf.buffer buffer in
- match%sedlex lexbuf with
- | "\"\"" ->
- Buffer.add_char buf '"';
- read_dquoted_string buf buffer
- | '"' -> Buffer.contents buf
- | any ->
- Buffer.add_string buf (Sedlexing.Utf8.lexeme lexbuf);
- read_dquoted_string buf buffer
- | _ -> raise Not_found
-
-let rec read_quoted_string buf buffer =
- let lexbuf = Lexbuf.buffer buffer in
- match%sedlex lexbuf with
- | "''" ->
- Buffer.add_char buf '\'';
- read_quoted_string buf buffer
- | '\'' -> Buffer.contents buf
- | eol ->
- Buffer.add_string buf (Lexbuf.content buffer);
- read_quoted_string buf buffer
- | any ->
- Buffer.add_string buf (Lexbuf.content buffer);
- read_quoted_string buf buffer
- | _ -> raise Not_found
-
-let rec skip_comment buffer =
- let lexbuf = Lexbuf.buffer buffer in
- match%sedlex lexbuf with
- | '{' ->
- let _ = wait_balance (read_long_string 0) buffer in
- skip_comment buffer
- | '\'' ->
- let _ = wait_balance read_quoted_string buffer in
- skip_comment buffer
- | '"' ->
- let _ = wait_balance read_dquoted_string buffer in
- skip_comment buffer
- | eol ->
- (* Ugly hack used in order to put the eol in the front of the next
- parsing. *)
- Sedlexing.rollback lexbuf;
- COMMENT
- | any -> skip_comment buffer
- | _ -> raise Not_found
-
-(** Main lexer *)
-let rec token : Lexbuf.t -> token =
- fun buffer ->
- let lexbuf = Lexbuf.buffer buffer in
- match%sedlex lexbuf with
- | 0Xfeff ->
- (* Ignore the BOM *)
- token buffer
- | '#', Star space, location ->
- (* Extract the location name *)
- let ident = Lexbuf.content buffer in
- let () =
- match Str.string_match location_name ident 0 with
- | false -> ()
- | true -> Sedlexing.set_filename lexbuf (Str.matched_group 1 ident)
- in
-
- (* Restart the line number (new location here) *)
- Lexbuf.start buffer;
-
- LOCATION_START ident
- | '-', Plus '-', Star (Sub (any, ('\r' | '\n'))) ->
- Lexbuf.reset_level buffer;
- LOCATION_END
- | Plus digit -> INTEGER (Lexbuf.content buffer)
- | '+' -> PLUS
- | '-' -> MINUS
- | "+=" -> INCR
- | "-=" -> DECR
- | "*=" -> MULT_EQUAL
- | '/' -> DIV
- | '*' -> STAR
- | ':' ->
- (* We are leaving the block, the comment will be handled again *)
- Lexbuf.decr_level buffer;
-
- COLUMN
- | '[' -> L_BRACKET
- | ']' -> R_BRACKET
- | '(' ->
- Lexbuf.incr_level buffer;
- L_PAREN
- | ')' ->
- Lexbuf.decr_level buffer;
- R_PAREN
- | '<' -> LT
- | '>' -> GT
- | coma -> COMA
- | '=' ->
- Lexbuf.incr_level buffer;
- EQUAL
- | ident -> build_ident buffer
- | eol ->
- Lexbuf.reset_level buffer;
- EOL
- | '&' ->
- Lexbuf.reset_level buffer;
- AMPERSAND
- | '!' -> if Lexbuf.level buffer > 0 then EXCLAMATION else skip_comment buffer
- | spaces -> token buffer
- | '\'' -> LITERAL (wait_balance read_quoted_string buffer)
- | '"' -> LITERAL (wait_balance read_dquoted_string buffer)
- | '{' -> LITERAL (wait_balance (read_long_string 0) buffer)
- | eof -> raise EOF
- | _ ->
- let position = fst @@ Sedlexing.lexing_positions lexbuf in
- let tok = Lexbuf.content buffer in
-
- let msg =
- Format.asprintf "Unexpected character %S at %a" tok pp_pos position
- in
-
- raise @@ LexError (position, msg)
-
-let rec discard buffer =
- let lexbuf = Lexbuf.buffer buffer in
- match%sedlex lexbuf with
- | '\'' ->
- ignore (wait_balance read_quoted_string buffer);
- discard buffer
- | '"' ->
- ignore (wait_balance read_dquoted_string buffer);
- discard buffer
- | '{' ->
- ignore (wait_balance (read_long_string 0) buffer);
- discard buffer
- | eof -> raise EOF
- | '-', Plus '-', Star (Sub (any, ('\r' | '\n'))) ->
- Lexbuf.reset_level buffer;
- ()
- | '!' ->
- ignore @@ skip_comment buffer;
- discard buffer
- | any -> discard buffer
- | _ -> raise EOF
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