rjango 0.1.1

A full-stack Rust backend framework inspired by Django
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169

const COMMON_P: &str = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.";
const COMMON_WORDS: &[&str] = &[
    "lorem",
    "ipsum",
    "dolor",
    "sit",
    "amet",
    "consectetur",
    "adipiscing",
    "elit",
    "sed",
    "do",
    "eiusmod",
    "tempor",
    "incididunt",
    "ut",
    "labore",
    "et",
    "dolore",
    "magna",
    "aliqua",
];
const WORDS: &[&str] = &[
    "dolor",
    "sit",
    "amet",
    "consectetur",
    "adipiscing",
    "elit",
    "sed",
    "do",
    "eiusmod",
    "tempor",
    "incididunt",
    "ut",
    "labore",
    "et",
    "dolore",
    "magna",
    "aliqua",
    "enim",
    "minim",
    "veniam",
    "quis",
    "nostrud",
    "exercitation",
    "ullamco",
];
const SENTENCE_WORDS: usize = 8;
const SENTENCES_PER_PARAGRAPH: usize = 3;

/// Return a deterministic lorem ipsum word sequence.
#[must_use]
pub fn words(count: usize, common: bool) -> String {
    if count == 0 {
        return String::new();
    }

    let source = if common { COMMON_WORDS } else { WORDS };

    (0..count)
        .map(|index| source[index % source.len()])
        .collect::<Vec<_>>()
        .join(" ")
}

/// Return a deterministic lorem ipsum sentence.
#[must_use]
pub fn sentence() -> String {
    build_sentence(COMMON_WORDS, 0, SENTENCE_WORDS)
}

/// Return the canonical lorem ipsum paragraph.
#[must_use]
pub fn paragraph() -> String {
    COMMON_P.to_string()
}

/// Return one or more deterministic lorem ipsum paragraphs.
#[must_use]
pub fn paragraphs(count: usize, common: bool) -> String {
    if count == 0 {
        return String::new();
    }

    (0..count)
        .map(|index| {
            if common && index == 0 {
                COMMON_P.to_string()
            } else {
                generated_paragraph(index)
            }
        })
        .collect::<Vec<_>>()
        .join("\n\n")
}

fn generated_paragraph(seed: usize) -> String {
    (0..SENTENCES_PER_PARAGRAPH)
        .map(|sentence_index| {
            build_sentence(
                WORDS,
                seed * 5 + sentence_index * SENTENCE_WORDS,
                SENTENCE_WORDS,
            )
        })
        .collect::<Vec<_>>()
        .join(" ")
}

fn build_sentence(source: &[&str], start: usize, count: usize) -> String {
    let words = (0..count)
        .map(|index| source[(start + index) % source.len()])
        .collect::<Vec<_>>()
        .join(" ");

    let mut chars = words.chars();
    let mut sentence = match chars.next() {
        Some(first) => first.to_ascii_uppercase().to_string(),
        None => String::new(),
    };
    sentence.push_str(chars.as_str());
    sentence.push('.');
    sentence
}

#[cfg(test)]
mod tests {
    use super::{paragraph, paragraphs, sentence, words};

    #[test]
    fn words_returns_expected_common_prefix() {
        assert_eq!(words(5, true), "lorem ipsum dolor sit amet");
    }

    #[test]
    fn words_cycles_deterministically_for_generated_text() {
        assert_eq!(
            words(6, false),
            "dolor sit amet consectetur adipiscing elit"
        );
        assert_eq!(words(26, false).split_whitespace().count(), 26);
    }

    #[test]
    fn sentence_and_paragraph_use_expected_text() {
        assert_eq!(
            sentence(),
            "Lorem ipsum dolor sit amet consectetur adipiscing elit."
        );
        assert_eq!(
            paragraph(),
            "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua."
        );
    }

    #[test]
    fn paragraphs_include_common_first_paragraph_when_requested() {
        let generated = paragraphs(2, true);
        let parts: Vec<_> = generated.split("\n\n").collect();

        assert_eq!(parts.len(), 2);
        assert_eq!(parts[0], paragraph());
        assert_eq!(
            parts[1],
            "Elit sed do eiusmod tempor incididunt ut labore. Et dolore magna aliqua enim minim veniam quis. Nostrud exercitation ullamco dolor sit amet consectetur adipiscing."
        );
    }
}