90 lines
2.0 KiB
C++
90 lines
2.0 KiB
C++
#include "conversion.h"
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#include <algorithm>
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////////////////////////////////////////////////////////////////
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// Specializations for converting a string to specific types
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namespace
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{
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// we're not gonna mess with the mess that is all the isupper/etc. functions
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bool IsLower(char ch) { return 'a' <= ch && ch <= 'z'; }
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bool IsUpper(char ch) { return 'A' <= ch && ch <= 'Z'; }
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char ToLower(char ch) { return IsUpper(ch) ? ch + 'a' - 'A' : ch; }
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std::string tolower(const std::string& str)
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{
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std::string s(str);
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std::transform(s.begin(), s.end(), s.begin(), ToLower);
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return s;
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}
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template <typename T>
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bool IsEntirely(const std::string& str, T func)
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{
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for(std::size_t i=0;i<str.size();i++)
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if(!func(str[i]))
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return false;
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return true;
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}
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// IsFlexibleCase
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// . Returns true if 'str' is:
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// . UPPERCASE
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// . lowercase
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// . Capitalized
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bool IsFlexibleCase(const std::string& str)
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{
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if(str.empty())
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return true;
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if(IsEntirely(str, IsLower))
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return true;
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bool firstcaps = IsUpper(str[0]);
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std::string rest = str.substr(1);
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return firstcaps && (IsEntirely(rest, IsLower) || IsEntirely(rest, IsUpper));
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}
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}
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namespace YAML
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{
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bool Convert(const std::string& input, bool& b)
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{
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// we can't use iostream bool extraction operators as they don't
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// recognize all possible values in the table below (taken from
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// http://yaml.org/type/bool.html)
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static const struct {
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std::string truename, falsename;
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} names[] = {
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{ "y", "n" },
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{ "yes", "no" },
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{ "true", "false" },
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{ "on", "off" },
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};
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if(!IsFlexibleCase(input))
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return false;
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for(unsigned i=0;i<sizeof(names)/sizeof(names[0]);i++) {
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if(names[i].truename == tolower(input)) {
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b = true;
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return true;
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}
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if(names[i].falsename == tolower(input)) {
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b = false;
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return true;
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}
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}
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return false;
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}
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bool Convert(const std::string& input, _Null& /*output*/)
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{
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return input.empty() || input == "~" || input == "null" || input == "Null" || input == "NULL";
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}
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}
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