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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <string>
#include <vector>
namespace search::predicate {
/**
* Builds a path from the root of a tree, to be able to describe a
* given position in the tree.
*/
class TreeCrumbs {
std::vector<char> _buffer;
public:
void setChild(size_t number, char delimiter = ':') {
_buffer.push_back(delimiter);
char buf[10];
int i = 0;
while (number > 0) {
buf[i++] = (number % 10) + '0';
number /= 10;
}
if (i == 0) {
_buffer.push_back('0');
}
while (i > 0) {
_buffer.push_back(buf[--i]);
}
}
void resize(size_t i) { _buffer.resize(i); }
size_t size() const { return _buffer.size(); }
std::string getCrumb() const {
if (_buffer.empty()) {
return std::string();
}
return std::string(&_buffer[0], _buffer.size());
}
};
}
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