private static boolean isSpaceChar ( int c ) {
  return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == - 1 ;
}

private static boolean isSpaceChar ( int c ) { return c == ' ▁ ' || c == ' \n ' || c == ' \r ' || c == ' \t ' || c == - 1 ; }
(method_declaration (modifiers) type: (boolean_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (return_statement (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (character_literal)) right: (binary_expression left: (identifier) right: (character_literal))) right: (binary_expression left: (identifier) right: (character_literal))) right: (binary_expression left: (identifier) right: (character_literal))) right: (binary_expression left: (identifier) right: (unary_expression operand: (decimal_integer_literal)))))))