string.h

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#ifndef GEOGRAM_BASIC_STRING
#define GEOGRAM_BASIC_STRING
 
#include <geogram/basic/common.h>
#include <geogram/basic/numeric.h>
 
#include <string>
#include <sstream>
#include <stdexcept>
#include <iomanip>
 
#include <vector>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <limits.h>
 
namespace GEO {
 
    /*
     * \brief String manipulation utilities.
     */
    namespace String {
 
        void GEOGRAM_API split_string(
            const std::string& in,
            char separator,
            std::vector<std::string>& out,
            bool skip_empty_fields = true
        );
 
        void GEOGRAM_API split_string(
            const std::string& in,
            const std::string& separator,
            std::vector<std::string>& out,
            bool skip_empty_fields = true
        );
        
        bool GEOGRAM_API split_string(
            const std::string& in,
            char separator,
            std::string& left,
            std::string& right
        );
        
        std::string GEOGRAM_API join_strings(
            const std::vector<std::string>& in,
            char separator
        );
 
        std::string GEOGRAM_API join_strings(
            const std::vector<std::string>& in,
            const std::string& separator
        );
 
        std::string GEOGRAM_API to_lowercase(const std::string& s);
 
        std::string GEOGRAM_API to_uppercase(const std::string& s);
 
        inline std::string char_to_string(char c) {
            char s[2];
            s[0] = c;
            s[1] = '\0';
            return std::string(s);
        }
 
        std::string GEOGRAM_API quote(
            const std::string& s, char quotes = '\"'
        );
 
        bool GEOGRAM_API string_starts_with(
            const std::string& haystack, const std::string& needle
        );
 
        bool GEOGRAM_API string_ends_with(
            const std::string& haystack, const std::string& needle
        );
 
        std::string GEOGRAM_API format(const char* format, ...)
#ifndef GOMGEN            
#ifdef GEO_COMPILER_GCC_FAMILY
        // Tells the compiler that format is a printf-like format
        // string, so that it can check that the arguments match
        // the format string and bark at you if it is not the case.
        __attribute__ ((__format__(printf, 1, 2)))
#endif
#endif            
        ; 
 
        template <class T>
        inline std::string to_string(const T& value) {
            std::ostringstream out;
            // Makes sure that double-precision number are displayed
            // with a sufficient number of digits. This is important
            // to avoid losing precision when using ASCII files.
            out << std::setprecision(17);
            out << value;
            return out.str();
        }
 
        template <class T>
        inline std::string to_display_string(const T& value) {
            return to_string(value);
        }
 
 
        template <>
        inline std::string to_display_string(const double& value) {
            std::ostringstream out;         
            out << value;
            return out.str();
        }
 
        template <>
        inline std::string to_display_string(const float& value) {
            std::ostringstream out;         
            out << value;
            return out.str();
        }
        
        template <>
        inline std::string to_string(const bool& value) {
            return value ? "true" : "false";
        }
 
        class GEOGRAM_API ConversionError : public std::logic_error {
        public:
            ConversionError(const std::string& s, const std::string& type);
 
            const char* what() const GEO_NOEXCEPT override;
        };
 
        template <class T>
        inline bool from_string(const char* s, T& value) {
            std::istringstream in(s);
            return (in >> value) && (in.eof() || ((in >> std::ws) && in.eof()));
        }
 
        template <class T>
        inline bool from_string(const std::string& s, T& value) {
            return from_string(s.c_str(), value);
        }
 
        template <>
        inline bool from_string(const char* s, double& value) {
            errno = 0;
            char* end;
            value = strtod(s, &end);
            return end != s && *end == '\0' && errno == 0;
        }
 
        template <typename T>
        inline bool string_to_signed_integer(const char* s, T& value) {
            errno = 0;
            char* end;
#ifdef GEO_OS_WINDOWS
            Numeric::int64 v = _strtoi64(s, &end, 10);
#else
            Numeric::int64 v = strtoll(s, &end, 10);
#endif
            if(
                end != s && *end == '\0' && errno == 0 &&
                v >= std::numeric_limits<T>::min() &&
                v <= std::numeric_limits<T>::max()
            ) {
                value = static_cast<T>(v);
                return true;
            }
 
            return false;
        }
 
        template <>
        inline bool from_string(const char* s, Numeric::int8& value) {
            return string_to_signed_integer(s, value);
        }
 
        template <>
        inline bool from_string(const char* s, Numeric::int16& value) {
            return string_to_signed_integer(s, value);
        }
 
        template <>
        inline bool from_string(const char* s, Numeric::int32& value) {
            return string_to_signed_integer(s, value);
        }
 
        template <>
        inline bool from_string(const char* s, Numeric::int64& value) {
            errno = 0;
            char* end;
#ifdef GEO_OS_WINDOWS
            value = _strtoi64(s, &end, 10);
#else
            value = strtoll(s, &end, 10);
#endif
            return end != s && *end == '\0' && errno == 0;
        }
 
        template <typename T>
        inline bool string_to_unsigned_integer(const char* s, T& value) {
            errno = 0;
            char* end;
#ifdef GEO_OS_WINDOWS
            Numeric::uint64 v = _strtoui64(s, &end, 10);
#else
            Numeric::uint64 v = strtoull(s, &end, 10);
#endif
            if(
                end != s && *end == '\0' && errno == 0 &&
                v <= std::numeric_limits<T>::max()
            ) {
                value = static_cast<T>(v);
                return true;
            }
 
            return false;
        }
 
        template <>
        inline bool from_string(const char* s, Numeric::uint8& value) {
            return string_to_unsigned_integer(s, value);
        }
 
        template <>
        inline bool from_string(const char* s, Numeric::uint16& value) {
            return string_to_unsigned_integer(s, value);
        }
 
        template <>
        inline bool from_string(const char* s, Numeric::uint32& value) {
            return string_to_unsigned_integer(s, value);
        }
 
        template <>
        inline bool from_string(const char* s, Numeric::uint64& value) {
            errno = 0;
            char* end;
#ifdef GEO_OS_WINDOWS
            value = _strtoui64(s, &end, 10);
#else
            value = strtoull(s, &end, 10);
#endif
            return end != s && *end == '\0' && errno == 0;
        }
 
        template <>
        inline bool from_string(const char* s, bool& value) {
            if(strcmp(s, "true") == 0 ||
                strcmp(s, "True") == 0 ||
                strcmp(s, "1") == 0
            ) {
                value = true;
                return true;
            }
            if(strcmp(s, "false") == 0 ||
                strcmp(s, "False") == 0 ||
                strcmp(s, "0") == 0
            ) {
                value = false;
                return true;
            }
            return false;
        }
 
        inline int to_int(const std::string& s) {
            int value;
            if(!from_string(s, value)) {
                throw ConversionError(s, "integer");
            }
            return value;
        }
 
        inline unsigned int to_uint(const std::string& s) {
            unsigned int value;
            if(!from_string(s, value)) {
                throw ConversionError(s, "integer");
            }
            return value;
        }
 
        inline double to_double(const std::string& s) {
            double value;
            if(!from_string(s, value)) {
                throw ConversionError(s, "double");
            }
            return value;
        }
 
        inline bool to_bool(const std::string& s) {
            bool value;
            if(!from_string(s, value)) {
                throw ConversionError(s, "boolean");
            }
            return value;
        }
 
        std::string GEOGRAM_API wchar_to_UTF8(const wchar_t* in);
    }
}
 
#endif