string_view_utils.hpp File Reference

#include <string>
#include <string_view>
#include <type_traits>
#include <utility>
#include <stdlib.h>
#include <ctype.h>

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Functions
template<typename T , std::enable_if_t<!from_chars_available_v< T >, bool > = true, std::enable_if_t< std::is_same_v< T, double >, bool > = true>
bool	parse_num (std::string_view sv, T &res)
template<typename T , std::enable_if_t<!from_chars_available_v< T >, bool > = true, std::enable_if_t< std::is_integral_v< T >, bool > = true>
bool	parse_num (std::string_view sv, T &res, int base=10)
template<typename T , auto convert, typename... Args>
bool	parse_num_fallback_impl (std::string_view sv, T &res, Args... args)
bool	sv_contains (std::string_view haystack, std::string_view needle)
bool	sv_is_prefix (std::string_view haystack, std::string_view needle)
std::string_view	sv_trim_whitespace (std::string_view sv)
std::string_view	sv_trim_whitespace_back (std::string_view sv)
std::string_view	sv_trim_whitespace_front (std::string_view sv)
std::string_view	tokenize (std::string_view &str, char delim, char quot='\0')
	Tokenizer for string_view.

Variables
template<typename T >
constexpr bool	from_chars_available_v = false

Detailed Description

Author

Martin Piatka piatk.nosp@m.a@ce.nosp@m.snet..nosp@m.cz

Definition in file string_view_utils.hpp.

Function Documentation

parse_num() [1/2]

template<typename T , std::enable_if_t<!from_chars_available_v< T >, bool > = true, std::enable_if_t< std::is_same_v< T, double >, bool > = true>

bool parse_num	(	std::string_view	sv,
		T &	res )

Definition at line 164 of file string_view_utils.hpp.

                                         {
        return parse_num_fallback_impl<T, strtod>(sv, res);
}

References parse_num_fallback_impl().

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parse_num() [2/2]

template<typename T , std::enable_if_t<!from_chars_available_v< T >, bool > = true, std::enable_if_t< std::is_integral_v< T >, bool > = true>

bool parse_num	(	std::string_view	sv,
		T &	res,
		int	base = 10 )

Definition at line 157 of file string_view_utils.hpp.

                                                        {
        return parse_num_fallback_impl<T, strtol>(sv, res, base);
}

References parse_num_fallback_impl().

Referenced by audio_cap_pipewire_init(), audio_play_pw_init(), display_conference_init(), display_conference_worker(), display_drm_init(), display_unix_sock_init(), init(), parse_cfg(), parse_holepunch_conf(), parse_log_cfg(), BandwidthWidget::parseLine(), RecvLossWidget::parseLine(), VuMeterWidget::parseLine(), and AvailableSettings::parseStateVersion().

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parse_num_fallback_impl()

template<typename T , auto convert, typename... Args>

bool parse_num_fallback_impl	(	std::string_view	sv,
		T &	res,
		Args...	args )

Definition at line 136 of file string_view_utils.hpp.

                                                                     {
        if(sv.empty())
                return false;
 
        std::string tmp(sv);
        const char *c_str_ptr = tmp.c_str();
        char *endptr = nullptr;
        T num;
 
        num = convert(c_str_ptr, &endptr, args...);
 
        if(c_str_ptr == endptr)
                return false;
 
        res = num;
        return true;
}

References convert.

Referenced by parse_num(), and parse_num().

sv_contains()

bool sv_contains ( std::string_view haystack, std::string_view needle )

inline

Definition at line 68 of file string_view_utils.hpp.

                                                                       {
        return haystack.find(needle) != std::string_view::npos;
}

Referenced by parse_log_cfg().

sv_is_prefix()

bool sv_is_prefix ( std::string_view haystack, std::string_view needle )

inline

Definition at line 72 of file string_view_utils.hpp.

                                                                        {
    return haystack.compare(0, needle.length(), needle) == 0;
}

Referenced by BandwidthWidget::parseLine(), RecvLossWidget::parseLine(), RecvReportWidget::parseLine(), VuMeterWidget::parseLine(), AvailableSettings::parseStateVersion(), AvailableSettings::queryLine(), and AvailableSettings::queryProcessLine().

sv_trim_whitespace()

std::string_view sv_trim_whitespace ( std::string_view sv )

inline

Definition at line 90 of file string_view_utils.hpp.

                                                           {
    return sv_trim_whitespace_front(sv_trim_whitespace_back(sv));
}

References sv_trim_whitespace_back(), and sv_trim_whitespace_front().

Referenced by AvailableSettings::queryProcessLine().

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sv_trim_whitespace_back()

std::string_view sv_trim_whitespace_back ( std::string_view sv )

inline

Definition at line 83 of file string_view_utils.hpp.

                                                                {
    size_t i = sv.size();
    while(i > 0 && isspace(sv[i - 1])) i--;
 
    return sv.substr(0, i);
}

Referenced by sv_trim_whitespace().

sv_trim_whitespace_front()

std::string_view sv_trim_whitespace_front ( std::string_view sv )

inline

Definition at line 76 of file string_view_utils.hpp.

                                                                 {
    size_t i = 0;
    while(i < sv.size() && isspace(sv[i])) i++;
 
    return sv.substr(i);
}

Referenced by sv_trim_whitespace().

tokenize()

std::string_view tokenize	(	std::string_view &	str,
		char	delim,
		char	quot = '\0' )

Tokenizer for string_view.

Useful for non-destructive tokenization of strings. Skips empty tokens. str is modified to view the not yet processed remainder.

Typical usage (prints lines "Hello", "World", "!"):

std::string_view sv = ":::Hello:World::!::";
while(!sv.empty()){
    cout << tokenize(sv, ':') << "\n";
}

The 'quot' param allows for a basic quotation based deilimiter escape, however the whole token must be escaped. i.e. sync:"opts=a=1:b=2":fs is fine, but sync:opts="a=1:b=2":fs is not.

Definition at line 3 of file string_view_utils.cpp.

                                                                   {
        if(str.empty())
                return {};
 
        bool escaped = false;
 
        auto token_begin = str.begin();
        while(token_begin != str.end()){
                if(*token_begin == quot)
                        escaped = !escaped;
                else if(*token_begin != delim)
                        break;
 
                token_begin++;
        }
 
        auto token_end = token_begin;
        while(token_end != str.end()){
                if(*token_end == quot){
                        str = std::string_view(token_end, str.end() - token_end);
                        str.remove_prefix(1); //remove the end quote
                        return std::string_view(token_begin, token_end - token_begin);
                }
                else if(*token_end == delim && !escaped)
                        break;
 
                token_end++;
        }
 
        str = std::string_view(token_end, str.end() - token_end);
 
        return std::string_view(token_begin, token_end - token_begin);
}

Referenced by audio_frame2_resampler::audio_frame2_resampler(), image_pattern_diagonal::image_pattern_diagonal(), image_pattern_text::image_pattern_text(), audio_cap_pipewire_init(), audio_init(), audio_play_pw_init(), display_conference_init(), display_conference_worker(), display_drm_init(), display_multiplier_init(), display_pw_init(), display_unix_sock_init(), Filter_chain::emplace_new(), init(), parse_cfg(), parse_cfg(), parse_holepunch_conf(), BandwidthWidget::parseLine(), RecvLossWidget::parseLine(), VuMeterWidget::parseLine(), print_capabilities(), and AvailableSettings::queryProcessLine().

Variable Documentation

from_chars_available_v

template<typename T >

bool from_chars_available_v = false

inlineconstexpr

Definition at line 131 of file string_view_utils.hpp.