/*===================== begin_copyright_notice ==================================

Copyright (c) 2017 Intel Corporation

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


======================= end_copyright_notice ==================================*/
#ifndef _IGA_LEXEMES_HPP_
#define _IGA_LEXEMES_HPP_

namespace iga {

enum Lexeme
{
  LEXICAL_ERROR = 0, // Windows GDI #define's "ERROR"
  NEWLINE,

  // delimiters
  LANGLE, // <
  RANGLE, // >
  LBRACK, // [
  RBRACK, // ]
  LBRACE, // {
  RBRACE, // }
  LPAREN, // (
  RPAREN, // )

  // separators
  DOT,   // .
  COMMA, // ,
  SEMI,  // ;
  COLON, // :

  // source modifiers and saturation
  // NEG (see SUB), // -       negation (src modifier)
  TILDE, // ~       bitwise complement
  // TODO: this is unsafe (abs) + 4 could be an imm. expression if abs bound
  ABS, // (abs)   absolute value
  SAT, // (sat)   saturatuation

  // reserved symbols
  BANG, // !
  AT,   // @
  DOLLAR, // $
  HASH, // #
  EQ,   // =

  // operators (reserved for future arithmetic)
  MUL,  // *
  DIV,  // /
  MOD,  // %
  ADD,  // +
  SUB,  // -
  LSH,  // <<
  RSH,  // >>
  AMP,  // &
  CIRC, // ^  (circumflex)
  PIPE, // |

  // variable lexemes
  IDENT,    // e.g. myVar
  INTLIT02, // 0b1101
  INTLIT10, // 13
  INTLIT16, // 0x123
  FLTLIT,   // 1.3, 0.1, 1e9, 1e-4

  // unused currently
  CHRLIT,  // character literals
  STRLIT,   // string literals

  END_OF_FILE, // special lexeme that indicates end of file
  NUM_LEXEMES
};

static const char *LexemeString(const Lexeme &l)
{
#define IGA_LEXEME_TOKEN(T) case Lexeme::T: return #T
  switch (l) {
  IGA_LEXEME_TOKEN(LEXICAL_ERROR);
  IGA_LEXEME_TOKEN(NEWLINE);

  IGA_LEXEME_TOKEN(LANGLE); // <
  IGA_LEXEME_TOKEN(RANGLE); // >
  IGA_LEXEME_TOKEN(LBRACK); // [
  IGA_LEXEME_TOKEN(RBRACK); // ]
  IGA_LEXEME_TOKEN(LBRACE); // {
  IGA_LEXEME_TOKEN(RBRACE); // }
  IGA_LEXEME_TOKEN(LPAREN); // (
  IGA_LEXEME_TOKEN(RPAREN); // )

  IGA_LEXEME_TOKEN(AMP);    // &
  IGA_LEXEME_TOKEN(PIPE);   // |
  IGA_LEXEME_TOKEN(DOT);    // .
  IGA_LEXEME_TOKEN(COMMA);  // ,
  IGA_LEXEME_TOKEN(SEMI);   // ;
  IGA_LEXEME_TOKEN(COLON);  // :

  IGA_LEXEME_TOKEN(TILDE);  // ~
  IGA_LEXEME_TOKEN(ABS);    // (abs)
  IGA_LEXEME_TOKEN(SAT);    // (sat)

  IGA_LEXEME_TOKEN(BANG);   // !
  IGA_LEXEME_TOKEN(AT);     // @
  IGA_LEXEME_TOKEN(HASH);   // #
  IGA_LEXEME_TOKEN(EQ);     // =

  IGA_LEXEME_TOKEN(MUL);    // *
  IGA_LEXEME_TOKEN(DIV);    // /
  IGA_LEXEME_TOKEN(MOD);    // %
  IGA_LEXEME_TOKEN(ADD);    // +
  IGA_LEXEME_TOKEN(SUB);    // -
  IGA_LEXEME_TOKEN(LSH);    // <<
  IGA_LEXEME_TOKEN(RSH);    // >>

  IGA_LEXEME_TOKEN(IDENT);  // [_a-zA-Z][_a-zA-Z0-9]*
  IGA_LEXEME_TOKEN(INTLIT02); // an integral pattern (base 2)
  IGA_LEXEME_TOKEN(INTLIT10); // an integral pattern (base 10)
  IGA_LEXEME_TOKEN(INTLIT16); // an integral pattern (base 16)
  IGA_LEXEME_TOKEN(FLTLIT); // a floating point pattern

  // currently unused
  IGA_LEXEME_TOKEN(CHRLIT); // a character literal
  IGA_LEXEME_TOKEN(STRLIT); // a string literal

  IGA_LEXEME_TOKEN(END_OF_FILE);

  default: return "?";
//  default: {
//    static char buf[16];
//    sprintf(buf,"%d?",(int)l);
//    return buf;
//    }
  }
#undef IGA_LEXEME_TOKEN
}

}
#endif // _LEXEMES_HPP_
