64 lines
1.1 KiB
C++
64 lines
1.1 KiB
C++
#include "beer_song.h"
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#include <cassert>
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#include <cctype>
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namespace beer {
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using namespace std;
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namespace {
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string count_bottles(int count)
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{
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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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return to_string(count) + " bottles";
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};
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void capitalize_first(string &str)
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{
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assert(!str.empty());
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str.front() = toupper(str.front());
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};
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}
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string verse(int index)
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{
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string result = count_bottles(index)
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+ " of beer on the wall, "
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+ count_bottles(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_bottles(index ? index - 1 : 99)
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+ " of beer on the wall.\n";
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capitalize_first(result);
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return result;
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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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assert(from_index >= to_index);
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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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