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Add old lady who swalled a fly example

This commit is contained in:
Timothy Warren 2019-02-12 12:35:49 -05:00
parent c5a08e2226
commit 396dde530e
5 changed files with 170 additions and 77 deletions
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1
.idea/misc.xml
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@ -44,6 +44,7 @@
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5
.idea/rust.iml
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@ -177,6 +177,10 @@
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@ -204,6 +208,7 @@
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160
.idea/workspace.xml
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@ -15,23 +15,28 @@
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@ -65,7 +70,6 @@
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@ -116,6 +120,7 @@
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@ -256,16 +278,6 @@
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@ -286,6 +298,16 @@
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@ -305,11 +327,11 @@
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@ -346,11 +368,11 @@
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7
old_lady_who_swallowed_a_fly/Cargo.toml Normal file
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@ -0,0 +1,7 @@
[package]
name = "old_lady_who_swallowed_a_fly"
version = "0.1.0"
authors = ["Timothy Warren <twarren@nabancard.com>"]
edition = "2018"
[dependencies]

74
old_lady_who_swallowed_a_fly/src/main.rs Normal file
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@ -0,0 +1,74 @@
#[derive(Clone, Debug)]
enum Flow { Every, Once, End }
use Flow::*;
#[derive(Clone, Debug)]
struct Verse {
animal: String,
flow_type: Flow,
aside: String,
}
impl Verse {
pub fn new(animal: &str, flow_type: Flow, aside: &str) -> Verse {
Verse {
animal: String::from(animal),
flow_type,
aside: String::from(aside)
}
}
}
fn swallowed_a(verse: &Verse) {
println!("\nThere was an old lady who swallowed a {};\n{}", verse.animal, verse.aside);
}
fn cumulative_refrain(slice: &[Verse]) {
for n in 0..slice.len() {
let repeat = &slice[n];
if n != (slice.len() - 1) {
let prev = &slice[n + 1];
println!("\tShe swallowed the {} to catch the {};", repeat.animal, prev.animal);
if let Every = prev.flow_type {
println!("\t{}", prev.aside);
}
}
}
}
fn print_verses(animals: [Verse;8]) {
for index in 0..animals.len() {
let verse = &animals[index];
swallowed_a(&verse);
// End early on the last verse
if let End = verse.flow_type {
return
};
if index > 0 {
let slice = &animals[0..=index];
let mut slice = slice.to_vec();
slice.reverse();
cumulative_refrain(&slice);
}
}
}
fn main() {
let animals = [
Verse::new("fly", Every, "I don't know why she swallowed a fly - perhaps she'll die!"),
Verse::new("spider", Every, "That wriggled and jiggled and tickled inside her!"),
Verse::new("bird", Once, "How absurd to swallow a bird!"),
Verse::new("cat", Once, "Imagine that! She swallowed a cat!"),
Verse::new("dog", Once, "What a hog, to swallow a dog!"),
Verse::new("goat", Once, "She just opened her throat and swallowed a goat!"),
Verse::new("cow", Once, "I don't know how she swallowed a cow!"),
Verse::new("horse", End, "She's dead of course!"),
];
print_verses(animals);
}