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124 lines
2.4 KiB
C++
124 lines
2.4 KiB
C++
#pragma once
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#include <DB/Common/Exception.h>
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#include <string>
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#include <cstring>
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namespace DB { namespace ErrorCodes {
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extern const int LOGICAL_ERROR;
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}}
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namespace detail
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{
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bool startsWith(const std::string & s, const char * prefix, size_t prefix_size);
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bool endsWith(const std::string & s, const char * suffix, size_t suffix_size);
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}
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inline bool startsWith(const std::string & s, const std::string & prefix)
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{
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return detail::startsWith(s, prefix.data(), prefix.size());
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}
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inline bool endsWith(const std::string & s, const std::string & suffix)
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{
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return detail::endsWith(s, suffix.data(), suffix.size());
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}
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/// With GCC, strlen is evaluated compile time if we pass it a constant
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/// string that is known at compile time.
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inline bool startsWith(const std::string & s, const char * prefix)
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{
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return detail::startsWith(s, prefix, strlen(prefix));
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}
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inline bool endsWith(const std::string & s, const char * suffix)
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{
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return detail::endsWith(s, suffix, strlen(suffix));
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}
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/// Given an integer, return the adequate suffix for
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/// printing an ordinal number.
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template <typename T>
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std::string getOrdinalSuffix(T n)
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{
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static_assert(std::is_integral<T>::value && std::is_unsigned<T>::value,
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"Unsigned integer value required");
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const auto val = n % 10;
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bool is_th;
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if ((val >= 1) && (val <= 3))
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is_th = (n > 10) && (((n / 10) % 10) == 1);
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else
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is_th = true;
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if (is_th)
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return "th";
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else
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{
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switch (val)
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{
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case 1: return "st";
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case 2: return "nd";
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case 3: return "rd";
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default: throw DB::Exception{"getOrdinalSuffix: internal error",
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DB::ErrorCodes::LOGICAL_ERROR};
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};
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}
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}
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/// More efficient than libc, because doesn't respect locale.
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inline bool isASCII(char c)
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{
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return static_cast<unsigned char>(c) < 0x80;
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}
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inline bool isAlphaASCII(char c)
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{
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return (c >= 'a' && c <= 'z')
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|| (c >= 'A' && c <= 'Z');
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}
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inline bool isNumericASCII(char c)
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{
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return (c >= '0' && c <= '9');
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}
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inline bool isAlphaNumericASCII(char c)
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{
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return isAlphaASCII(c)
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|| isNumericASCII(c);
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}
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inline bool isWordCharASCII(char c)
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{
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return isAlphaNumericASCII(c)
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|| c == '_';
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}
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inline bool isWhitespaceASCII(char c)
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{
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return c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\f' || c == '\v';
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}
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/// Works assuming isAlphaASCII.
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inline char toLowerIfAlphaASCII(char c)
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{
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return c | 0x20;
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}
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inline char toUpperIfAlphaASCII(char c)
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{
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return c & (~0x20);
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}
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inline char alternateCaseIfAlphaASCII(char c)
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{
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return c ^ 0x20;
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}
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