codeviz 0.0.15

Flexible code generator for Rust
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

use errors::*;
use common::ElementFormatter;
use std::collections::BTreeMap;
use std::collections::BTreeSet;
use std::collections::btree_map;
use super::element::*;
use super::elements::Elements;
use super::imports::{Imports, ImportReceiver};
use super::name::ImportedName;
use super::statement::Statement;
use super::variable::Variable;

#[derive(Debug, Clone)]
pub struct FileSpec {
    pub elements: Elements,
}

impl FileSpec {
    pub fn new() -> FileSpec {
        FileSpec { elements: Elements::new() }
    }

    pub fn push<E>(&mut self, element: E)
        where E: Into<Element>
    {
        self.elements.push(element);
    }

    fn module_to_path(&self, path: &str) -> String {
        let parts: Vec<&str> = path.split(".").collect();
        format!("{}.js", parts.join("/"))
    }

    fn imports(&self) -> Option<Elements> {
        let mut imports = BTreeSet::new();
        self.elements.imports(&mut imports);

        // specific imports from modules.
        let mut collected: BTreeMap<String, Vec<String>> = BTreeMap::new();
        // * imported modules, and their alias.
        let mut wildcard: BTreeSet<(String, String)> = BTreeSet::new();

        for import in imports {
            if let Some(alias) = import.alias {
                wildcard.insert((import.module, alias));
            } else {
                match collected.entry(import.module.clone()) {
                    btree_map::Entry::Vacant(entry) => {
                        entry.insert(vec![import.name.clone()]);
                    }
                    btree_map::Entry::Occupied(entry) => {
                        entry.into_mut().push(import.name.clone());
                    }
                }
            }
        }

        if collected.is_empty() && wildcard.is_empty() {
            return None;
        }

        let mut out = Elements::new();

        for (module, names) in collected {
            let mut stmt = Statement::new();

            stmt.push("import ");
            stmt.push("{");
            stmt.push(names.join(", "));
            stmt.push("}");
            stmt.push(" from ");
            stmt.push(Variable::String(self.module_to_path(&module)));
            stmt.push(";");

            out.push(stmt);
        }

        for (module, alias) in wildcard {
            let mut stmt = Statement::new();

            stmt.push("import * as ");
            stmt.push(alias);
            stmt.push(" from ");
            stmt.push(Variable::String(self.module_to_path(&module)));
            stmt.push(";");

            out.push(stmt);
        }

        Some(out)
    }

    pub fn format<W>(&self, out: &mut W) -> Result<()>
        where W: ::std::fmt::Write
    {
        let mut elements = Elements::new();

        if let Some(imports) = self.imports() {
            elements.push(imports);
        }

        elements.push(self.elements.clone().join(Spacing));

        let elements: Element = elements.join(Spacing).into();

        elements.format(&mut ElementFormatter::new(out))?;
        out.write_char('\n')?;

        Ok(())
    }
}

impl ImportReceiver for BTreeSet<ImportedName> {
    fn receive(&mut self, name: &ImportedName) {
        self.insert(name.clone());
    }
}

impl ToString for FileSpec {
    fn to_string(&self) -> String {
        let mut s = String::new();
        self.format(&mut s).unwrap();
        s
    }
}