58 lines
1.2 KiB
C++
58 lines
1.2 KiB
C++
#include "beer_song.h"
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#include <cctype>
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#include <sstream>
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namespace beer {
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using namespace std;
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string verse(int index)
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{
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auto count_str = [](int count) -> string {
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if (0 == count)
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return "no more bottles ";
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if (1 == count)
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return "1 bottle ";
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ostringstream oss;
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oss << count << " bottles ";
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return oss.str();
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};
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auto capitalize_first = [](const string &str) -> string {
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string result = str;
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result.front() = toupper(result.front());
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return result;
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};
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return capitalize_first(count_str(index))
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+ "of beer on the wall, "
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+ count_str(index)
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+ "of beer.\n"
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+ (index ? string("Take ")
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+ (index == 1 ? "it" : "one")
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+ " down and pass it around, "
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: string("Go to the store and buy some more, "))
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+ count_str(index ? index - 1 : 99)
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+ "of beer on the wall.\n";
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}
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string sing(int from_index, int to_index)
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{
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string result;
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for (int i = from_index; i >= to_index; --i) {
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result += (i == from_index ? "" : "\n");
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result += verse(i);
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}
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return result;
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}
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}
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