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{
  open Odf_ExpressionParser
  open Lexing

  exception SyntaxError of string
}

let digit = ['0'-'9']
let real = digit+ | digit* '.' digit+ | digit+ '.' digit*


let newline = "\r\n" | '\n' | '\r'
let space = ['\t' ' '] | newline

let letters = ['A'-'Z' 'a'-'z']
let identifier = letters (letters | digit | ['-' '_' '.'])* (letters | digit)+

let text = letters | digit 

let cell = letters+ digit+

rule read = parse
  | space+   { read lexbuf }

  | digit+ as _1 { NUM (_1, Num.num_of_string _1)}
  | real as _1  { REAL (Tools.String.filter_float _1, Tools.Num.of_float_string _1)}
  | '$'         { DOLLAR }

  | '='         { EQ }
  | "<>"        { NEQ }
  | '<'         { LT }
  | "<="        { LE }
  | '>'         { GT }
  | ">="        { GE }
  | '*'         { TIMES }
  | '+'         { PLUS }
  | '-'         { MINUS }
  | '/'         { DIVIDE }
  | '"'         { read_string (Buffer.create 17) lexbuf }
  | ';'         { SEMICOLON }
  | ':'         { COLON }
  | '['         { L_SQ_BRACKET }
  | ']'         { R_SQ_BRACKET }
  | '('         { LPAREN }
  | ')'         { RPAREN }
  | '^'         { POW }
  | '.'         { DOT }

  | letters+ as _1   { LETTERS _1}

  | '\000'      { EOF }
  | eof         { EOF }

and read_string buf = parse
  | '"'       { STR (Buffer.contents buf) }
  | '\\' '/'  { Buffer.add_char buf '/'; read_string buf lexbuf }
  | '\\' '\\' { Buffer.add_char buf '\\'; read_string buf lexbuf }
  | '\\' 'b'  { Buffer.add_char buf '\b'; read_string buf lexbuf }
  | '\\' 'f'  { Buffer.add_char buf '\012'; read_string buf lexbuf }
  | '\\' 'n'  { Buffer.add_char buf '\n'; read_string buf lexbuf }
  | '\\' 'r'  { Buffer.add_char buf '\r'; read_string buf lexbuf }
  | '\\' 't'  { Buffer.add_char buf '\t'; read_string buf lexbuf }
  | '\\' '"'  { Buffer.add_char buf '"'; read_string buf lexbuf }
  | [^ '"' '\\' '\000']+
    { Buffer.add_string buf (Lexing.lexeme lexbuf);
      read_string buf lexbuf
    }
  | '\000'  { STR (Buffer.contents buf) }
  | _ { raise (SyntaxError ("Illegal string character: " ^ Lexing.lexeme lexbuf)) }
  | eof { STR ( Buffer.contents buf) }

and quoteless_string buf = parse
  | '\\' '/'  { Buffer.add_char buf '/';    quoteless_string buf lexbuf }
  | '\\' '\\' { Buffer.add_char buf '\\';   quoteless_string buf lexbuf }
  | '\\' 'b'  { Buffer.add_char buf '\b';   quoteless_string buf lexbuf }
  | '\\' 'f'  { Buffer.add_char buf '\012'; quoteless_string buf lexbuf }
  | '\\' 'n'  { Buffer.add_char buf '\n';   quoteless_string buf lexbuf }
  | '\\' 'r'  { Buffer.add_char buf '\r';   quoteless_string buf lexbuf }
  | '\\' 't'  { Buffer.add_char buf '\t';   quoteless_string buf lexbuf }
  | '\\' '"'  { Buffer.add_char buf '"';    quoteless_string buf lexbuf }
  | [^ '\\' '\000']+
    { Buffer.add_string buf (Lexing.lexeme lexbuf);
      quoteless_string buf lexbuf
    }
  | '\000'  { STR (Buffer.contents buf) }
  | _ { raise (SyntaxError ("Illegal string character: " ^ Lexing.lexeme lexbuf)) }
  | eof { STR (Buffer.contents buf) }