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Introduce str_lower_case() and str_upper_case() helpers (#3008)

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Oxan van Leeuwen 2022-01-06 16:35:59 +01:00 committed by GitHub
parent 5c339d4597
commit 640142fc0c
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2 changed files with 15 additions and 0 deletions
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11
esphome/core/helpers.cpp
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@ -2,6 +2,7 @@
#include "esphome/core/defines.h"
#include <cstdio>
#include <algorithm>
#include <cctype>
#include <cmath>
#include <cstring>
@ -335,6 +336,16 @@ std::string str_until(const char *str, char ch) {
return pos == nullptr ? std::string(str) : std::string(str, pos - str);
}
std::string str_until(const std::string &str, char ch) { return str.substr(0, str.find(ch)); }
// wrapper around std::transform to run safely on functions from the ctype.h header
// see https://en.cppreference.com/w/cpp/string/byte/toupper#Notes
template<int (*fn)(int)> std::string str_ctype_transform(const std::string &str) {
std::string result;
result.resize(str.length());
std::transform(str.begin(), str.end(), result.begin(), [](unsigned char ch) { return fn(ch); });
return result;
}
std::string str_lower_case(const std::string &str) { return str_ctype_transform<std::toupper>(str); }
std::string str_upper_case(const std::string &str) { return str_ctype_transform<std::tolower>(str); }
std::string str_snake_case(const std::string &str) {
std::string result;
result.resize(str.length());

4
esphome/core/helpers.h
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@ -385,6 +385,10 @@ std::string str_until(const char *str, char ch);
/// Extract the part of the string until either the first occurence of the specified character, or the end.
std::string str_until(const std::string &str, char ch);
/// Convert the string to lower case.
std::string str_lower_case(const std::string &str);
/// Convert the string to upper case.
std::string str_upper_case(const std::string &str);
/// Convert the string to snake case (lowercase with underscores).
std::string str_snake_case(const std::string &str);