fluidattacks-blends-domain 0.41.0

Blends functional core: pure AST graph to syntax graph (no_std)
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

use alloc::vec::Vec;

use crate::stack::build::StackBuilder;
use crate::stack::{
    import_sites, BindingReach, Definition, ImportSite, StackNode, SymbolPop, SymbolPush,
};
use crate::syntax::SyntaxGraph;
use crate::{Language, NodeId};

impl StackBuilder {
    pub(super) fn add_imports(
        &mut self,
        syntax: &SyntaxGraph,
        language: Language,
        root: NodeId,
        path: &str,
    ) {
        let directories = package_directories(path);
        for site in import_sites(syntax, language) {
            if site.reach == BindingReach::Scope
                && matches!(self.graph.nodes.get(&site.scope), Some(StackNode::Scope(_)))
            {
                self.add_import(&site, language, root, &directories);
            }
        }
    }

    fn add_import(
        &mut self,
        site: &ImportSite,
        language: Language,
        root: NodeId,
        directories: &[&str],
    ) {
        let binding = &site.binding;
        let module = imported_module(
            binding.module_stem.as_str(),
            binding.relative_level,
            language,
            directories,
        );
        let imported = (!binding.binds_module).then(|| {
            binding
                .source_symbol
                .as_deref()
                .unwrap_or(site.symbol.as_str())
        });
        let pushes: Option<Vec<&str>> = module.map(|module| {
            imported
                .filter(|symbol| *symbol != "*")
                .into_iter()
                .chain(qualified(&module).into_iter().rev())
                .collect()
        });
        if site.symbol == "*" {
            let Some([first, rest @ ..]) = pushes.as_deref() else {
                return;
            };
            self.graph.add_node(site.node, relay(first));
            self.graph.add_edge(site.scope, site.node, 0);
            self.add_pushes(site.node, rest, root);
            return;
        }
        self.graph.add_node(
            site.node,
            StackNode::PopSymbol(SymbolPop {
                symbol: site.symbol.clone(),
                precedence: 1,
                definition: Some(Definition {
                    is_private: language != Language::Python,
                    visibility_guard: None,
                }),
                import: Some(binding.clone()),
            }),
        );
        self.graph.add_edge(site.scope, site.node, 1);
        if let Some(pushes) = pushes {
            self.add_pushes(site.node, &pushes, root);
        }
    }

    fn add_pushes(&mut self, from: NodeId, symbols: &[&str], root: NodeId) {
        let last = symbols.iter().fold(from, |previous, symbol| {
            let push = self.add(relay(symbol));
            self.graph.add_edge(previous, push, 0);
            push
        });
        self.graph.add_edge(last, root, 0);
    }
}

fn relay(symbol: &str) -> StackNode {
    StackNode::PushSymbol(SymbolPush {
        symbol: symbol.into(),
        precedence: 0,
        is_reference: false,
    })
}

fn package_directories(path: &str) -> Vec<&str> {
    path.rsplit_once('/')
        .map_or("", |(directories, _)| directories)
        .split(['/', '.'])
        .filter(|segment| !segment.is_empty())
        .collect()
}

fn imported_module<'a>(
    stem: &'a str,
    relative_level: u32,
    language: Language,
    directories: &[&'a str],
) -> Option<Vec<&'a str>> {
    let package = if relative_level == 0 {
        &[][..]
    } else {
        let climbed = usize::try_from(relative_level.saturating_sub(1)).ok()?;
        let kept = directories.len().checked_sub(climbed)?;
        if language == Language::Python && kept == 0 {
            return None;
        }
        directories.get(..kept)?
    };
    Some(
        package
            .iter()
            .copied()
            .chain(stem.split('.').filter(|segment| !segment.is_empty()))
            .collect(),
    )
}

fn qualified<'a>(segments: &[&'a str]) -> Vec<&'a str> {
    segments
        .iter()
        .enumerate()
        .flat_map(|(index, segment)| (index > 0).then_some(".").into_iter().chain([*segment]))
        .collect()
}