/**
 *
 * Copyright 2021-2023 Ribose Inc. (https://www.ribose.com)
 *
 * 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.
 *
 * Original copyright
 *
 * SEXP implementation code sexp-output.c
 * Ron Rivest
 * 5/5/1997
 */

#include "sexpp/sexp.h"

namespace sexp {
/*
 * sexp_simple_string_t::print_canonical_verbatim(os)
 * Print out simple string on output stream os as verbatim string.
 */
sexp_output_stream_t *sexp_simple_string_t::print_canonical_verbatim(
  sexp_output_stream_t *os) const
{
    const octet_t *c = c_str();
    /* print out len: */
    os->print_decimal(length())->var_put_char(':');
    /* print characters in fragment */
    for (uint32_t i = 0; i < length(); i++)
        os->var_put_char((int) *c++);
    return os;
}

/*
 * sexp_simple_string_t::advanced_length(os)
 * Returns length of printed image of s
 */
size_t sexp_simple_string_t::advanced_length(sexp_output_stream_t *os) const
{
    if (can_print_as_token(os))
        return advanced_length_token();
    else if (can_print_as_quoted_string())
        return advanced_length_quoted();
    else if (length() <= 4 && os->get_byte_size() == 8)
        return advanced_length_hexadecimal();
    else if (os->get_byte_size() == 8)
        return advanced_length_base64();
    else
        return 0; /* an error condition */
}

/*
 * sexp_simple_string_t::print_token(os)
 * Prints out simple string ss as a token (assumes that this is OK).
 * May run over max-column, but there is no fragmentation allowed...
 */
sexp_output_stream_t *sexp_simple_string_t::print_token(sexp_output_stream_t *os) const
{
    const octet_t *c = c_str();
    if (os->get_max_column() > 0 && os->get_column() > (os->get_max_column() - length()))
        os->new_line(sexp_output_stream_t::advanced);
    for (uint32_t i = 0; i < length(); i++)
        os->put_char((int) (*c++));
    return os;
}

/*
 * sexp_simple_string_t::print_base64(os)
 * Prints out simple string ss as a base64 value.
 */
sexp_output_stream_t *sexp_simple_string_t::print_base64(sexp_output_stream_t *os) const
{
    const octet_t *c = c_str();
    os->var_put_char('|')->change_output_byte_size(6, sexp_output_stream_t::advanced);
    for (uint32_t i = 0; i < length(); i++)
        os->var_put_char((int) (*c++));
    return os->flush()
      ->change_output_byte_size(8, sexp_output_stream_t::advanced)
      ->var_put_char('|');
}

/*
 * sexp_simple_string_t::print_hexadecimal(os)
 * Prints out simple string as a hexadecimal value.
 */
sexp_output_stream_t *sexp_simple_string_t::print_hexadecimal(sexp_output_stream_t *os) const
{
    const octet_t *c = c_str();
    os->put_char('#')->change_output_byte_size(4, sexp_output_stream_t::advanced);
    for (uint32_t i = 0; i < length(); i++)
        os->var_put_char((int) (*c++));
    return os->flush()
      ->change_output_byte_size(8, sexp_output_stream_t::advanced)
      ->put_char('#');
}

/*
 * sexp_simple_string_t::print_quoted(os)
 * Prints out simple string ss as a quoted string
 * This code assumes that all characters are tokenchars and blanks,
 *  so no escape sequences need to be generated.
 * May run over max-column, but there is no fragmentation allowed...
 */
sexp_output_stream_t *sexp_simple_string_t::print_quoted(sexp_output_stream_t *os) const
{
    const octet_t *c = c_str();
    os->put_char('\"');
    for (uint32_t i = 0; i < length(); i++) {
        if (os->get_max_column() > 0 && os->get_column() >= os->get_max_column() - 2) {
            os->put_char('\\')->put_char('\n');
            os->reset_column();
        }
        os->put_char(*c++);
    }
    return os->put_char('\"');
}

/*
 * sexp_simple_string_t::print_advanced(os)
 * Prints out simple string onto output stream ss
 */
sexp_output_stream_t *sexp_simple_string_t::print_advanced(sexp_output_stream_t *os) const
{
    if (can_print_as_token(os))
        print_token(os);
    else if (can_print_as_quoted_string())
        print_quoted(os);
    else if (length() <= 4 && os->get_byte_size() == 8)
        print_hexadecimal(os);
    else if (os->get_byte_size() == 8)
        print_base64(os);
    else
        sexp_error(sexp_exception_t::error,
                   "Can't print in advanced mode with restricted output character set",
                   0,
                   0,
                   EOF);
    return os;
}

/*
 * sexp_simple_string_t::can_print_as_quoted_string(void)
 * Returns true if simple string can be printed as a quoted string.
 * Must have only tokenchars and blanks.
 */
bool sexp_simple_string_t::can_print_as_quoted_string(void) const
{
    const octet_t *c = c_str();
    for (uint32_t i = 0; i < length(); i++, c++) {
        if (!is_token_char((int) (*c)) && *c != ' ')
            return false;
    }
    return true;
}

/*
 * sexp_simple_string_t::can_print_as_token(os)
 * Returns true if simple string can be printed as a token.
 * Doesn't begin with a digit, and all characters are tokenchars.
 */
bool sexp_simple_string_t::can_print_as_token(const sexp_output_stream_t *os) const
{
    const octet_t *c = c_str();
    if (length() <= 0)
        return false;
    if (is_dec_digit((int) *c))
        return false;
    if (os->get_max_column() > 0 && os->get_column() + length() >= os->get_max_column())
        return false;
    for (uint32_t i = 0; i < length(); i++) {
        if (!is_token_char((int) (*c++)))
            return false;
    }
    return true;
}

} // namespace sexp