87 lines
2 KiB
C++
87 lines
2 KiB
C++
#include "food_chain.h"
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#include <string>
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namespace food_chain {
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using namespace std;
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#define ANIMAL_TABLE \
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X(Fly, "fly", "") \
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X(Spider, "spider", "It wriggled and jiggled and tickled inside her.\n") \
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X(Bird, "bird", "How absurd to swallow a bird!\n") \
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X(Cat, "cat", "Imagine that, to swallow a cat!\n") \
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X(Dog, "dog", "What a hog, to swallow a dog!\n") \
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X(Goat, "goat", "Just opened her throat and swallowed a goat!\n") \
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X(Cow, "cow", "I don't know how she swallowed a cow!\n") \
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X(Horse, "horse", "She's dead, of course!\n")
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#define X(a, b, c) a,
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enum Animal {
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ANIMAL_TABLE
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};
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#undef X
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#define X(a, b, c) b,
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static const char *animal_name[] = {
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ANIMAL_TABLE
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};
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#undef X
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#define X(a, b, c) c,
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static const char *verse_phrase[] = {
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ANIMAL_TABLE
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};
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#undef X
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string verse(int index)
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{
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string result;
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--index;
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result += string("I know an old lady who swallowed a ")
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+ animal_name[index]
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+ ".\n"
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+ verse_phrase[index];
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if (index != Animal::Horse) {
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for (int i = index; i > Animal::Fly; --i) {
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result += string("She swallowed the ")
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+ animal_name[i]
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+ " to catch the "
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+ animal_name[i-1];
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if (i == Animal::Bird)
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result += string(" that wriggled and jiggled and "
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"tickled inside her");
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result += string(".\n");
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}
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result += "I don't know why she swallowed the fly. "
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"Perhaps she'll die.\n";
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}
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return result;
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}
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string verses(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 += verse(i) + '\n';
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return result;
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}
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string sing()
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{
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return verses(1, 8);
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}
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}
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