Exemplo n.º 1
0
/**
 * Parse and construct lexer token
 *
 * Note:
 *      Currently, lexer token doesn't fully correspond to Token, defined in ECMA-262, v5, 7.5.
 *      For example, there is no new-line token type in the token definition of ECMA-262 v5.
 *
 * @return constructed token
 */
static token
lexer_parse_token (void)
{
  ecma_char_t c = LA (0);

  if (lit_char_is_white_space (c))
  {
    while (lit_char_is_white_space (c))
    {
      consume_char ();

      c = LA (0);
    }
  }

  if (lit_char_is_line_terminator (c))
  {
    while (lit_char_is_line_terminator (c))
    {
      consume_char ();

      c = LA (0);
    }

    return create_token (TOK_NEWLINE, 0);
  }

  JERRY_ASSERT (is_token_parse_in_progress == false);

  /* ECMA-262 v5, 7.6, Identifier */
  if (lexer_is_char_can_be_identifier_start (c))
  {
    return lexer_parse_identifier_or_keyword ();
  }

  /* ECMA-262 v5, 7.8.3, Numeric literal */
  if (lit_char_is_decimal_digit (c)
      || (c == LIT_CHAR_DOT
          && lit_char_is_decimal_digit (LA (1))))
  {
    return lexer_parse_number ();
  }

  if (c == LIT_CHAR_LF)
  {
    consume_char ();
    return create_token (TOK_NEWLINE, 0);
  }

  if (c == LIT_CHAR_NULL)
  {
    return create_token (TOK_EOF, 0);
  }

  if (c == LIT_CHAR_SINGLE_QUOTE
      || c == LIT_CHAR_DOUBLE_QUOTE)
  {
    return lexer_parse_string ();
  }

  /* ECMA-262 v5, 7.4, SingleLineComment or MultiLineComment */
  if (c == LIT_CHAR_SLASH
      && (LA (1) == LIT_CHAR_SLASH
          || LA (1) == LIT_CHAR_ASTERISK))
  {
    if (lexer_parse_comment ())
    {
      return create_token (TOK_NEWLINE, 0);
    }
    else
    {
      return lexer_parse_token ();
    }
  }

  if (c == LIT_CHAR_SLASH
      && !(prev_non_lf_token.type == TOK_NAME
           || prev_non_lf_token.type == TOK_NULL
           || prev_non_lf_token.type == TOK_BOOL
           || prev_non_lf_token.type == TOK_CLOSE_BRACE
           || prev_non_lf_token.type == TOK_CLOSE_SQUARE
           || prev_non_lf_token.type == TOK_CLOSE_PAREN
           || prev_non_lf_token.type == TOK_SMALL_INT
           || prev_non_lf_token.type == TOK_NUMBER
           || prev_non_lf_token.type == TOK_STRING
           || prev_non_lf_token.type == TOK_REGEXP))
  {
    return lexer_parse_regexp ();
  }

  /* ECMA-262 v5, 7.7, Punctuator */
  switch (c)
  {
    case LIT_CHAR_LEFT_BRACE:
    {
      RETURN_PUNC (TOK_OPEN_BRACE);
      break;
    }
    case LIT_CHAR_RIGHT_BRACE:
    {
      RETURN_PUNC (TOK_CLOSE_BRACE);
      break;
    }
    case LIT_CHAR_LEFT_PAREN:
    {
      RETURN_PUNC (TOK_OPEN_PAREN);
      break;
    }
    case LIT_CHAR_RIGHT_PAREN:
    {
      RETURN_PUNC (TOK_CLOSE_PAREN);
      break;
    }
    case LIT_CHAR_LEFT_SQUARE:
    {
      RETURN_PUNC (TOK_OPEN_SQUARE);
      break;
    }
    case LIT_CHAR_RIGHT_SQUARE:
    {
      RETURN_PUNC (TOK_CLOSE_SQUARE);
      break;
    }
    case LIT_CHAR_DOT:
    {
      RETURN_PUNC (TOK_DOT);
      break;
    }
    case LIT_CHAR_SEMICOLON:
    {
      RETURN_PUNC (TOK_SEMICOLON);
      break;
    }
    case LIT_CHAR_COMMA:
    {
      RETURN_PUNC (TOK_COMMA);
      break;
    }
    case LIT_CHAR_TILDE:
    {
      RETURN_PUNC (TOK_COMPL);
      break;
    }
    case LIT_CHAR_COLON:
    {
      RETURN_PUNC (TOK_COLON);
      break;
    }
    case LIT_CHAR_QUESTION:
    {
      RETURN_PUNC (TOK_QUERY);
      break;
    }

    case LIT_CHAR_ASTERISK:
    {
      IF_LA_IS (LIT_CHAR_EQUALS, TOK_MULT_EQ, TOK_MULT);
      break;
    }
    case LIT_CHAR_SLASH:
    {
      IF_LA_IS (LIT_CHAR_EQUALS, TOK_DIV_EQ, TOK_DIV);
      break;
    }
    case LIT_CHAR_CIRCUMFLEX:
    {
      IF_LA_IS (LIT_CHAR_EQUALS, TOK_XOR_EQ, TOK_XOR);
      break;
    }
    case LIT_CHAR_PERCENT:
    {
      IF_LA_IS (LIT_CHAR_EQUALS, TOK_MOD_EQ, TOK_MOD);
      break;
    }
    case LIT_CHAR_PLUS:
    {
      IF_LA_IS_OR (LIT_CHAR_PLUS, TOK_DOUBLE_PLUS, LIT_CHAR_EQUALS, TOK_PLUS_EQ, TOK_PLUS);
      break;
    }
    case LIT_CHAR_MINUS:
    {
      IF_LA_IS_OR (LIT_CHAR_MINUS, TOK_DOUBLE_MINUS, LIT_CHAR_EQUALS, TOK_MINUS_EQ, TOK_MINUS);
      break;
    }
    case LIT_CHAR_AMPERSAND:
    {
      IF_LA_IS_OR (LIT_CHAR_AMPERSAND, TOK_DOUBLE_AND, LIT_CHAR_EQUALS, TOK_AND_EQ, TOK_AND);
      break;
    }
    case LIT_CHAR_VLINE:
    {
      IF_LA_IS_OR (LIT_CHAR_VLINE, TOK_DOUBLE_OR, LIT_CHAR_EQUALS, TOK_OR_EQ, TOK_OR);
      break;
    }
    case LIT_CHAR_LESS_THAN:
    {
      switch (LA (1))
      {
        case LIT_CHAR_LESS_THAN: IF_LA_N_IS (LIT_CHAR_EQUALS, TOK_LSHIFT_EQ, TOK_LSHIFT, 2); break;
        case LIT_CHAR_EQUALS: RETURN_PUNC_EX (TOK_LESS_EQ, 2); break;
        default: RETURN_PUNC (TOK_LESS);
      }
      break;
    }
    case LIT_CHAR_GREATER_THAN:
    {
      switch (LA (1))
      {
        case LIT_CHAR_GREATER_THAN:
        {
          switch (LA (2))
          {
            case LIT_CHAR_GREATER_THAN: IF_LA_N_IS (LIT_CHAR_EQUALS, TOK_RSHIFT_EX_EQ, TOK_RSHIFT_EX, 3); break;
            case LIT_CHAR_EQUALS: RETURN_PUNC_EX (TOK_RSHIFT_EQ, 3); break;
            default: RETURN_PUNC_EX (TOK_RSHIFT, 2);
          }
          break;
        }
        case LIT_CHAR_EQUALS: RETURN_PUNC_EX (TOK_GREATER_EQ, 2); break;
        default: RETURN_PUNC (TOK_GREATER);
      }
      break;
    }
    case LIT_CHAR_EQUALS:
    {
      if (LA (1) == LIT_CHAR_EQUALS)
      {
        IF_LA_N_IS (LIT_CHAR_EQUALS, TOK_TRIPLE_EQ, TOK_DOUBLE_EQ, 2);
      }
      else
      {
        RETURN_PUNC (TOK_EQ);
      }
      break;
    }
    case LIT_CHAR_EXCLAMATION:
    {
      if (LA (1) == LIT_CHAR_EQUALS)
      {
        IF_LA_N_IS (LIT_CHAR_EQUALS, TOK_NOT_DOUBLE_EQ, TOK_NOT_EQ, 2);
      }
      else
      {
        RETURN_PUNC (TOK_NOT);
      }
      break;
    }
  }

  PARSE_ERROR (JSP_EARLY_ERROR_SYNTAX, "Illegal character", lit_utf8_iterator_get_pos (&src_iter));
} /* lexer_parse_token */
Exemplo n.º 2
0
static token
lexer_next_token_private (void)
{
  ecma_char_t c = LA (0);

  JERRY_ASSERT (token_start == NULL);

  if (isalpha (c) || c == '$' || c == '_')
  {
    return parse_name ();
  }

  if (isdigit (c) || (c == '.' && isdigit (LA (1))))
  {
    return parse_number ();
  }

  if (c == '\n')
  {
    consume_char ();
    return create_token (TOK_NEWLINE, 0);
  }

  if (c == '\0')
  {
    return create_token (TOK_EOF, 0);
  }

  if (c == '\'' || c == '"')
  {
    return parse_string ();
  }

  if (isspace (c))
  {
    grobble_whitespaces ();
    return lexer_next_token_private ();
  }

  if (c == '/' && LA (1) == '*')
  {
    if (replace_comment_by_newline ())
    {
      token ret;

      ret.type = TOK_NEWLINE;
      ret.uid = 0;

      return ret;
    }
    else
    {
      return lexer_next_token_private ();
    }
  }


  if (c == '/')
  {
    if (LA (1) == '/')
    {
      replace_comment_by_newline ();
      return lexer_next_token_private ();
    }
    else if (!(sent_token.type == TOK_NAME
             || sent_token.type == TOK_NULL
             || sent_token.type == TOK_BOOL
             || sent_token.type == TOK_CLOSE_BRACE
             || sent_token.type == TOK_CLOSE_SQUARE
             || sent_token.type == TOK_CLOSE_PAREN
             || sent_token.type == TOK_SMALL_INT
             || sent_token.type == TOK_NUMBER
             || sent_token.type == TOK_STRING
             || sent_token.type == TOK_REGEXP))
    {
      return parse_regexp ();
    }
  }

  switch (c)
  {
    case '{': RETURN_PUNC (TOK_OPEN_BRACE); break;
    case '}': RETURN_PUNC (TOK_CLOSE_BRACE); break;
    case '(': RETURN_PUNC (TOK_OPEN_PAREN); break;
    case ')': RETURN_PUNC (TOK_CLOSE_PAREN); break;
    case '[': RETURN_PUNC (TOK_OPEN_SQUARE); break;
    case ']': RETURN_PUNC (TOK_CLOSE_SQUARE); break;
    case '.': RETURN_PUNC (TOK_DOT); break;
    case ';': RETURN_PUNC (TOK_SEMICOLON); break;
    case ',': RETURN_PUNC (TOK_COMMA); break;
    case '~': RETURN_PUNC (TOK_COMPL); break;
    case ':': RETURN_PUNC (TOK_COLON); break;
    case '?': RETURN_PUNC (TOK_QUERY); break;

    case '*': IF_LA_IS ('=', TOK_MULT_EQ, TOK_MULT); break;
    case '/': IF_LA_IS ('=', TOK_DIV_EQ, TOK_DIV); break;
    case '^': IF_LA_IS ('=', TOK_XOR_EQ, TOK_XOR); break;
    case '%': IF_LA_IS ('=', TOK_MOD_EQ, TOK_MOD); break;

    case '+': IF_LA_IS_OR ('+', TOK_DOUBLE_PLUS, '=', TOK_PLUS_EQ, TOK_PLUS); break;
    case '-': IF_LA_IS_OR ('-', TOK_DOUBLE_MINUS, '=', TOK_MINUS_EQ, TOK_MINUS); break;
    case '&': IF_LA_IS_OR ('&', TOK_DOUBLE_AND, '=', TOK_AND_EQ, TOK_AND); break;
    case '|': IF_LA_IS_OR ('|', TOK_DOUBLE_OR, '=', TOK_OR_EQ, TOK_OR); break;

    case '<':
    {
      switch (LA (1))
      {
        case '<': IF_LA_N_IS ('=', TOK_LSHIFT_EQ, TOK_LSHIFT, 2); break;
        case '=': RETURN_PUNC_EX (TOK_LESS_EQ, 2); break;
        default: RETURN_PUNC (TOK_LESS);
      }
      break;
    }
    case '>':
    {
      switch (LA (1))
      {
        case '>':
        {
          switch (LA (2))
          {
            case '>': IF_LA_N_IS ('=', TOK_RSHIFT_EX_EQ, TOK_RSHIFT_EX, 3); break;
            case '=': RETURN_PUNC_EX (TOK_RSHIFT_EQ, 3); break;
            default: RETURN_PUNC_EX (TOK_RSHIFT, 2);
          }
          break;
        }
        case '=': RETURN_PUNC_EX (TOK_GREATER_EQ, 2); break;
        default: RETURN_PUNC (TOK_GREATER);
      }
      break;
    }
    case '=':
    {
      if (LA (1) == '=')
      {
        IF_LA_N_IS ('=', TOK_TRIPLE_EQ, TOK_DOUBLE_EQ, 2);
      }
      else
      {
        RETURN_PUNC (TOK_EQ);
      }
      break;
    }
    case '!':
    {
      if (LA (1) == '=')
      {
        IF_LA_N_IS ('=', TOK_NOT_DOUBLE_EQ, TOK_NOT_EQ, 2);
      }
      else
      {
        RETURN_PUNC (TOK_NOT);
      }
      break;
    }
    default: PARSE_SORRY ("Unknown character", buffer - buffer_start);
  }
  PARSE_SORRY ("Unknown character", buffer - buffer_start);
}
Exemplo n.º 3
0
/**
 * Parse and construct lexer token
 *
 * Note:
 *      Currently, lexer token doesn't fully correspond to Token, defined in ECMA-262, v5, 7.5.
 *      For example, there is no new-line token type in the token definition of ECMA-262 v5.
 *
 * Note:
 *      For Lexer alone, it is hard to find out a token is whether a regexp or a division.
 *      Parser must set maybe_regexp to true if a regexp is expected.
 *      Otherwise, a division is expected.
 *
 * @return constructed token
 */
static token
lexer_parse_token (bool maybe_regexp, /**< read '/' as regexp? */
                   bool *out_is_preceed_by_new_lines_p, /**< out: is constructed token preceded by newlines? */
                   bool is_strict) /**< flag, indicating whether current code is in strict mode code */

{
  JERRY_ASSERT (is_token_parse_in_progress == false);

  *out_is_preceed_by_new_lines_p = lexer_skip_whitespace_and_comments ();

  ecma_char_t c = LA (0);

  /* ECMA-262 v5, 7.6, Identifier */
  if (lexer_is_char_can_be_identifier_start (c))
  {
    return lexer_parse_identifier_or_keyword (is_strict);
  }

  /* ECMA-262 v5, 7.8.3, Numeric literal */
  if (lit_char_is_decimal_digit (c)
      || (c == LIT_CHAR_DOT
          && lit_char_is_decimal_digit (LA (1))))
  {
    return lexer_parse_number (is_strict);
  }

  if (c == LIT_CHAR_NULL)
  {
    return create_token (TOK_EOF, 0);
  }

  if (c == LIT_CHAR_SINGLE_QUOTE
      || c == LIT_CHAR_DOUBLE_QUOTE)
  {
    return lexer_parse_string ();
  }

  if (c == LIT_CHAR_SLASH && maybe_regexp)
  {
    return lexer_parse_regexp ();
  }

  /* ECMA-262 v5, 7.7, Punctuator */
  switch (c)
  {
    case LIT_CHAR_LEFT_BRACE:
    {
      RETURN_PUNC (TOK_OPEN_BRACE);
      break;
    }
    case LIT_CHAR_RIGHT_BRACE:
    {
      RETURN_PUNC (TOK_CLOSE_BRACE);
      break;
    }
    case LIT_CHAR_LEFT_PAREN:
    {
      RETURN_PUNC (TOK_OPEN_PAREN);
      break;
    }
    case LIT_CHAR_RIGHT_PAREN:
    {
      RETURN_PUNC (TOK_CLOSE_PAREN);
      break;
    }
    case LIT_CHAR_LEFT_SQUARE:
    {
      RETURN_PUNC (TOK_OPEN_SQUARE);
      break;
    }
    case LIT_CHAR_RIGHT_SQUARE:
    {
      RETURN_PUNC (TOK_CLOSE_SQUARE);
      break;
    }
    case LIT_CHAR_DOT:
    {
      RETURN_PUNC (TOK_DOT);
      break;
    }
    case LIT_CHAR_SEMICOLON:
    {
      RETURN_PUNC (TOK_SEMICOLON);
      break;
    }
    case LIT_CHAR_COMMA:
    {
      RETURN_PUNC (TOK_COMMA);
      break;
    }
    case LIT_CHAR_TILDE:
    {
      RETURN_PUNC (TOK_COMPL);
      break;
    }
    case LIT_CHAR_COLON:
    {
      RETURN_PUNC (TOK_COLON);
      break;
    }
    case LIT_CHAR_QUESTION:
    {
      RETURN_PUNC (TOK_QUERY);
      break;
    }

    case LIT_CHAR_ASTERISK:
    {
      IF_LA_IS (LIT_CHAR_EQUALS, TOK_MULT_EQ, TOK_MULT);
      break;
    }
    case LIT_CHAR_SLASH:
    {
      IF_LA_IS (LIT_CHAR_EQUALS, TOK_DIV_EQ, TOK_DIV);
      break;
    }
    case LIT_CHAR_CIRCUMFLEX:
    {
      IF_LA_IS (LIT_CHAR_EQUALS, TOK_XOR_EQ, TOK_XOR);
      break;
    }
    case LIT_CHAR_PERCENT:
    {
      IF_LA_IS (LIT_CHAR_EQUALS, TOK_MOD_EQ, TOK_MOD);
      break;
    }
    case LIT_CHAR_PLUS:
    {
      IF_LA_IS_OR (LIT_CHAR_PLUS, TOK_DOUBLE_PLUS, LIT_CHAR_EQUALS, TOK_PLUS_EQ, TOK_PLUS);
      break;
    }
    case LIT_CHAR_MINUS:
    {
      IF_LA_IS_OR (LIT_CHAR_MINUS, TOK_DOUBLE_MINUS, LIT_CHAR_EQUALS, TOK_MINUS_EQ, TOK_MINUS);
      break;
    }
    case LIT_CHAR_AMPERSAND:
    {
      IF_LA_IS_OR (LIT_CHAR_AMPERSAND, TOK_DOUBLE_AND, LIT_CHAR_EQUALS, TOK_AND_EQ, TOK_AND);
      break;
    }
    case LIT_CHAR_VLINE:
    {
      IF_LA_IS_OR (LIT_CHAR_VLINE, TOK_DOUBLE_OR, LIT_CHAR_EQUALS, TOK_OR_EQ, TOK_OR);
      break;
    }
    case LIT_CHAR_LESS_THAN:
    {
      switch (LA (1))
      {
        case LIT_CHAR_LESS_THAN: IF_LA_N_IS (LIT_CHAR_EQUALS, TOK_LSHIFT_EQ, TOK_LSHIFT, 2); break;
        case LIT_CHAR_EQUALS: RETURN_PUNC_EX (TOK_LESS_EQ, 2); break;
        default: RETURN_PUNC (TOK_LESS);
      }
      break;
    }
    case LIT_CHAR_GREATER_THAN:
    {
      switch (LA (1))
      {
        case LIT_CHAR_GREATER_THAN:
        {
          switch (LA (2))
          {
            case LIT_CHAR_GREATER_THAN: IF_LA_N_IS (LIT_CHAR_EQUALS, TOK_RSHIFT_EX_EQ, TOK_RSHIFT_EX, 3); break;
            case LIT_CHAR_EQUALS: RETURN_PUNC_EX (TOK_RSHIFT_EQ, 3); break;
            default: RETURN_PUNC_EX (TOK_RSHIFT, 2);
          }
          break;
        }
        case LIT_CHAR_EQUALS: RETURN_PUNC_EX (TOK_GREATER_EQ, 2); break;
        default: RETURN_PUNC (TOK_GREATER);
      }
      break;
    }
    case LIT_CHAR_EQUALS:
    {
      if (LA (1) == LIT_CHAR_EQUALS)
      {
        IF_LA_N_IS (LIT_CHAR_EQUALS, TOK_TRIPLE_EQ, TOK_DOUBLE_EQ, 2);
      }
      else
      {
        RETURN_PUNC (TOK_EQ);
      }
      break;
    }
    case LIT_CHAR_EXCLAMATION:
    {
      if (LA (1) == LIT_CHAR_EQUALS)
      {
        IF_LA_N_IS (LIT_CHAR_EQUALS, TOK_NOT_DOUBLE_EQ, TOK_NOT_EQ, 2);
      }
      else
      {
        RETURN_PUNC (TOK_NOT);
      }
      break;
    }
  }

  PARSE_ERROR (JSP_EARLY_ERROR_SYNTAX, "Illegal character", lit_utf8_iterator_get_pos (&src_iter));
} /* lexer_parse_token */