C++ parse_number函数代码示例

/* ****************************************************************** */
static ssize_t ppc_rtas_clock_write(struct file *file,
		const char __user *buf, size_t count, loff_t *ppos)
{
	struct rtc_time tm;
	unsigned long nowtime;
	int error = parse_number(buf, count, &nowtime);
	if (error)
		return error;

	to_tm(nowtime, &tm);
	error = rtas_call(rtas_token("set-time-of-day"), 7, 1, NULL, 
			tm.tm_year, tm.tm_mon, tm.tm_mday, 
			tm.tm_hour, tm.tm_min, tm.tm_sec, 0);
	if (error)
		printk(KERN_WARNING "error: setting the clock returned: %s\n", 
				ppc_rtas_process_error(error));
	return count;
}

    std::pair< bool, bool > parser::parse(const char* begin, const char* end)
    {
        assert( !state_.empty() );

        for ( ; begin != end && !state_.empty(); )
        {
            switch ( main_state( state_.top() ) )
            {
            case idle_parsing:
                begin = eat_white_space(begin, end);

                if ( begin != end )
                {
                    state_.top() = parse_idle(*begin);
                }
                break;
            case start_number_parsing:
                begin = parse_number(begin, end);
                break;
            case start_array_parsing:
                begin = parse_array(begin, end);
                break;
            case start_object_parsing:
                begin = parse_object(begin, end);
                break;
            case start_string_parsing:
                begin = parse_string(begin, end);
                break;
            case start_true_parsing:
            case start_false_parsing:
            case start_null_parsing:
                begin = parse_literal(begin, end);
                break;
            default:
                assert(!"should not happen");
            }
        }

        // consume trailing whitespaces
        if ( state_.empty() )
            begin = eat_white_space(begin, end);

        return std::make_pair( begin == end, state_.empty() );
    }

/* Parser core - when encountering text, process appropriately. */
static const char *parse_value(cJSON *item, const char *value, const char **ep)
{
    if (!value)
    {
        /* Fail on null. */
        return 0;
    }

    /* parse the different types of values */
    if (!strncmp(value, "null", 4))
    {
        item->type = cJSON_NULL;
        return value + 4;
    }
    if (!strncmp(value, "false", 5))
    {
        item->type = cJSON_False;
        return value + 5;
    }
    if (!strncmp(value, "true", 4))
    {
        item->type = cJSON_True;
        item->valueint = 1;
        return value + 4;
    }
    if (*value == '\"')
    {
        return parse_string(item, value, ep);
    }
    if ((*value == '-') || ((*value >= '0') && (*value <= '9')))
    {
        return parse_number(item, value);
    }
    if (*value == '[')
    {
        return parse_array(item, value, ep);
    }
    if (*value == '{')
    {
        return parse_object(item, value, ep);
    }

    *ep=value;return 0;	/* failure. */
}

// Note: this function returns a pointer, but for some strange
// reason we must put the asterisk after the EXPORT.
CI_Result EXPORT * CI_submit( char const* input )
{
    double number;
    if( !parse_number( input, number ) )
        return NULL;

    std::ostringstream ss;
    ss << number;
    std::string result = ss.str();

    CI_Result* res = new CI_Result;

    res->input       = component( input );
    res->num_outputs = 1;
    res->outputs     = new CI_ResultComponent[1];
    res->outputs[0]  = component( result.c_str() );

    return res;
}

/* ****************************************************************** */
static ssize_t ppc_rtas_tone_volume_write(struct file *file,
		const char __user *buf, size_t count, loff_t *ppos)
{
	unsigned long volume;
	int error = parse_number(buf, count, &volume);
	if (error)
		return error;

	if (volume > 100)
		volume = 100;
	
        rtas_tone_volume = volume; /* save it for later */
	error = rtas_call(rtas_token("set-indicator"), 3, 1, NULL,
			TONE_VOLUME, 0, volume);
	if (error)
		printk(KERN_WARNING "error: setting tone volume returned: %s\n", 
				ppc_rtas_process_error(error));
	return count;
}

version_number_t::version_number_t(const std::string &s)
  : valid(false)
{
  memset(parts, 0, 5 * sizeof(unsigned int));

  if (debugging_requested("version_check"))
    mxinfo(boost::format("version check: Parsing %1%\n") % s);

  // Match the following:
  // 4.4.0
  // 4.4.0.5 build 123
  // 4.4.0-build20101201-123
  // mkvmerge v4.4.0
  // * Optional prefix "mkvmerge v"
  // * At least three digits separated by dots
  // * Optional fourth digit separated by a dot
  // * Optional build number that can have two forms:
  //   - " build nnn"
  //   - "-buildYYYYMMDD-nnn" (date is ignored)
  static boost::regex s_version_number_re("^ (?: mkv[a-z]+ \\s+ v)?"     // Optional prefix mkv... v
                                          "(\\d+) \\. (\\d+) \\. (\\d+)" // Three digitss separated by dots; $1 - $3
                                          "(?: \\. (\\d+) )?"            // Optional fourth digit separated by a dot; $4
                                          "(?:"                          // Optional build number including its prefix
                                          " (?: \\s* build \\s*"         //   Build number prefix: either " build " or...
                                          "  |  - build \\d{8} - )"      //   ... "-buildYYYYMMDD-"
                                          " (\\d+)"                      //   The build number itself; $5
                                          ")?",
                                          boost::regex::perl | boost::regex::mod_x);

  boost::smatch matches;
  if (!boost::regex_search(s, matches, s_version_number_re))
    return;

  size_t idx;
  for (idx = 1; 5 >= idx; ++idx)
    if (!matches[idx].str().empty())
      parse_number(matches[idx].str(), parts[idx - 1]);

  valid = true;

  if (debugging_requested("version_check"))
    mxinfo(boost::format("version check: parse OK; result: %1%\n") % to_string());
}

/* Parser core - when encountering text, process appropriately. */
static const char *ICACHE_FLASH_ATTR
parse_value(cJSON *item, const char *value)
{
    if (!value) {
        return 0;    /* Fail on null. */
    }

    if (!strncmp(value, "null", 4))    {
        item->type = cJSON_NULL;
        return value + 4;
    }

    if (!strncmp(value, "false", 5))   {
        item->type = cJSON_False;
        return value + 5;
    }

    if (!strncmp(value, "true", 4))    {
        item->type = cJSON_True;
        item->valueint = 1;
        return value + 4;
    }

    if (*value == '\"')               {
        return parse_string(item, value);
    }

    if (*value == '-' || (*value >= '0' && *value <= '9'))    {
        return parse_number(item, value);
    }

    if (*value == '[')                {
        return parse_array(item, value);
    }

    if (*value == '{')                {
        return parse_object(item, value);
    }

    ep = value;
    return 0;  /* failure. */
}

// primary_expr ::= number
//                  bool
//                  ( expr )
//          
Expr*
parse_primary_expr(Parser& p, Token_stream& ts)
{
  if (ts.next()) {
    switch (ts.next()->kind()) {
      case number_tok: return parse_number(p, ts);
      case lparen_tok: return parse_paren_enclosed(p, ts);
      case bool_tok: return parse_bool(p, ts);
      // // negative number
      // case minus_tok: return parse_neg(p, ts);
      default:
        print("Unable to parse primary expr beginning with: ");
        print(ts.next());
        print("\n");
        return nullptr;
    }
  }

  return nullptr;
}

/* value = 'null' | 'true' | 'false' | number | string | array | object */
static int parse_value(struct frozen *f) {
  int ch = cur(f);

  switch (ch) {
    case '"':
      TRY(parse_string(f));
      break;
    case '{':
      TRY(parse_object(f));
      break;
    case '[':
      TRY(parse_array(f));
      break;
    case 'n':
      TRY(expect(f, "null", 4, JSON_TYPE_NULL));
      break;
    case 't':
      TRY(expect(f, "true", 4, JSON_TYPE_TRUE));
      break;
    case 'f':
      TRY(expect(f, "false", 5, JSON_TYPE_FALSE));
      break;
    case '-':
    case '0':
    case '1':
    case '2':
    case '3':
    case '4':
    case '5':
    case '6':
    case '7':
    case '8':
    case '9':
      TRY(parse_number(f));
      break;
    default:
      return ch == END_OF_STRING ? JSON_STRING_INCOMPLETE : JSON_STRING_INVALID;
  }

  return 0;
}

void
extract_cli_parser_c::add_extraction_spec() {
  if (   (options_c::em_tracks       != m_options.m_extraction_mode)
      && (options_c::em_timecodes_v2 != m_options.m_extraction_mode)
      && (options_c::em_attachments  != m_options.m_extraction_mode))
    mxerror(boost::format(Y("Unrecognized command line option '%1%'.\n")) % m_current_arg);

  boost::regex s_track_id_re("^(\\d+)(:(.+))?$", boost::regex::perl);

  boost::smatch matches;
  if (!boost::regex_search(m_current_arg, matches, s_track_id_re)) {
    if (options_c::em_attachments == m_options.m_extraction_mode)
      mxerror(boost::format(Y("Invalid attachment ID/file name specification in argument '%1%'.\n")) % m_current_arg);
    else
      mxerror(boost::format(Y("Invalid track ID/file name specification in argument '%1%'.\n")) % m_current_arg);
  }

  track_spec_t track;

  parse_number(matches[1].str(), track.tid);

  std::string output_file_name;
  if (matches[3].matched)
    output_file_name = matches[3].str();

  if (output_file_name.empty()) {
    if (options_c::em_attachments == m_options.m_extraction_mode)
      mxinfo(Y("No output file name specified, will use attachment name.\n"));
    else
      mxerror(boost::format(Y("Missing output file name in argument '%1%'.\n")) % m_current_arg);
  }

  track.out_name               = output_file_name;
  track.sub_charset            = m_charset;
  track.extract_cuesheet       = m_extract_cuesheet;
  track.extract_blockadd_level = m_extract_blockadd_level;
  track.target_mode            = m_target_mode;
  m_options.m_tracks.push_back(track);

  set_default_values();
}

std::string
get_local_charset() {
  std::string lc_charset;

  setlocale(LC_CTYPE, "");
#if defined(COMP_MINGW) || defined(COMP_MSC)
  lc_charset = "CP" + to_string(GetACP());
#elif defined(SYS_SOLARIS)
  int i;

  lc_charset = nl_langinfo(CODESET);
  if (parse_number(lc_charset, i))
    lc_charset = std::string("ISO") + lc_charset + std::string("-US");
#elif HAVE_NL_LANGINFO
  lc_charset = nl_langinfo(CODESET);
#elif HAVE_LOCALE_CHARSET
  lc_charset = locale_charset();
#endif

  return lc_charset;
}

	Variant JSONReader::parse_value()
	{
		skip_space();

		if (at('{'))
			return parse_object();
		if (at('['))
			return parse_array();
		if (at('"'))
			return parse_string();
		if (at_digit() || at('-'))
			return parse_number();
		if (skip_string("true"))
			return Variant(true);
		if (skip_string("false"))
			return Variant(false);
		if (skip_string("null"))
			return Variant();

		throw Exception(position(), "invalid value");
	}

/* ****************************************************************** */
static ssize_t ppc_rtas_poweron_write(struct file *file,
		const char __user *buf, size_t count, loff_t *ppos)
{
	struct rtc_time tm;
	unsigned long nowtime;
	int error = parse_number(buf, count, &nowtime);
	if (error)
		return error;

	power_on_time = nowtime; /* save the time */

	to_tm(nowtime, &tm);

	error = rtas_call(rtas_token("set-time-for-power-on"), 7, 1, NULL, 
			tm.tm_year, tm.tm_mon, tm.tm_mday, 
			tm.tm_hour, tm.tm_min, tm.tm_sec, 0 /* nano */);
	if (error)
		printk(KERN_WARNING "error: setting poweron time returned: %s\n", 
				ppc_rtas_process_error(error));
	return count;
}

/*
 * parenthesized expression or value
 */
double ExpParser::parse_level10()
{
    // check if it is a parenthesized expression
    if (token_type == DELIMETER)
    {
        if (token[0] == '(' && token[1] == '\0')
        {
            getToken();
            double ans = parse_level2();
            if (token_type != DELIMETER || token[0] != ')' || token[1] || '\0')
            {
                throw Error(row(), col(), 3);
            }
            getToken();
            return ans;
        }
    }

    // if not parenthesized then the expression is a value
    return parse_number();
}

size_t
dt_parse_iso_time_basic(const char *str, size_t len, int *sp, int *fp) {
    const unsigned char *p;
    int h, m, s, f;
    size_t n;

    p = (const unsigned char *)str;
    n = count_digits(p, 0, len);
    m = s = f = 0;
    switch (n) {
        case 2: /* hh */
            h = parse_number(p, 0, 2);
            goto hms;
        case 4: /* hhmm */
            h = parse_number(p, 0, 2);
            m = parse_number(p, 2, 2);
            goto hms;
        case 6: /* hhmmss */
            h = parse_number(p, 0, 2);
            m = parse_number(p, 2, 2);
            s = parse_number(p, 4, 2);
            break;
        default:
            return 0;
    }

    /* hhmmss.fffffffff */
    if (n < len && (p[n] == '.' || p[n] == ',')) {
        size_t r = parse_fraction_digits(p, ++n, len, &f);
        if (!r)
            return 0;
        n += r;
    }

  hms:
    if (h > 23 || m > 59 || s > 59) {
        if (!(h == 24 && m == 0 && s == 0 && f == 0))
            return 0;
    }

    if (sp)
        *sp = h * 3600 + m * 60 + s;
    if (fp)
        *fp = f;
    return n;
}