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(*
This file is part of licht.
licht is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
licht is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with licht. If not, see <http://www.gnu.org/licenses/>.
*)
{
open ExpressionParser
open Lexing
exception SyntaxError of string
}
let digit = ['0'-'9']
let real = digit+ '.'? | digit* '.' digit+
let newline = "\r\n" | '\n' | '\r'
let space = ['\t' ' '] | newline
let letters = ['A'-'Z' 'a'-'z']
let text = letters | digit
let cell = letters+ digit+
rule read = parse
| space+ { read lexbuf }
| digit+ as _1 { NUM _1}
| real as _1 { REAL(Tools.String.filter_float _1)}
| '$' { DOLLAR }
| '=' { EQ }
| "<>" { NEQ }
| '<' { LT }
| "<=" { LE }
| '>' { GT }
| ">=" { GE }
| '*' { TIMES }
| '+' { PLUS }
| '-' { MINUS }
| '/' { DIVIDE }
| '"' { read_string (Buffer.create 17) lexbuf }
| ';' { SEMICOLON }
| ':' { COLON }
| '(' { LPAREN }
| ')' { RPAREN }
| '^' { POW }
| 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) }
|
