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

use serde::ser::Serializer;
use serde::Serialize;
use std::fmt;
use tree_sitter::Node;

use crate::checker::Checker;
use crate::*;

/// The `Cyclomatic` metric.
#[derive(Debug)]
pub struct Stats {
    cyclomatic: f64,
    n: usize,
}

impl Default for Stats {
    fn default() -> Self {
        Self {
            cyclomatic: 1.,
            n: 1,
        }
    }
}

impl Serialize for Stats {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        serializer.serialize_f64(self.cyclomatic())
    }
}

impl fmt::Display for Stats {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}", self.cyclomatic)
    }
}

impl Stats {
    /// Merges a second `Cyclomatic` metric into the first one
    pub fn merge(&mut self, other: &Stats) {
        self.cyclomatic += other.cyclomatic;
        self.n += other.n;
    }

    /// Returns the `Cyclomatic` metric value
    pub fn cyclomatic(&self) -> f64 {
        self.cyclomatic / self.n as f64
    }
}

#[doc(hidden)]
pub trait Cyclomatic
where
    Self: Checker,
{
    fn compute(_node: &Node, _stats: &mut Stats) {}
}

impl Cyclomatic for PythonCode {
    fn compute(node: &Node, stats: &mut Stats) {
        use Python::*;

        match node.kind_id().into() {
            If | Elif | For | While | Except | With | Assert | And | Or => {
                stats.cyclomatic += 1.;
            }
            Else => {
                if has_ancestors!(node, ForStatement | WhileStatement, ElseClause) {
                    stats.cyclomatic += 1.;
                }
            }
            _ => {}
        }
    }
}

impl Cyclomatic for MozjsCode {
    fn compute(node: &Node, stats: &mut Stats) {
        use Mozjs::*;

        match node.kind_id().into() {
            If | For | While | Case | Catch | TernaryExpression | AMPAMP | PIPEPIPE => {
                stats.cyclomatic += 1.;
            }
            _ => {}
        }
    }
}

impl Cyclomatic for JavascriptCode {
    fn compute(node: &Node, stats: &mut Stats) {
        use Javascript::*;

        match node.kind_id().into() {
            If | For | While | Case | Catch | TernaryExpression | AMPAMP | PIPEPIPE => {
                stats.cyclomatic += 1.;
            }
            _ => {}
        }
    }
}

impl Cyclomatic for TypescriptCode {
    fn compute(node: &Node, stats: &mut Stats) {
        use Typescript::*;

        match node.kind_id().into() {
            If | For | While | Case | Catch | TernaryExpression | AMPAMP | PIPEPIPE => {
                stats.cyclomatic += 1.;
            }
            _ => {}
        }
    }
}

impl Cyclomatic for TsxCode {
    fn compute(node: &Node, stats: &mut Stats) {
        use Tsx::*;

        match node.kind_id().into() {
            If | For | While | Case | Catch | TernaryExpression | AMPAMP | PIPEPIPE => {
                stats.cyclomatic += 1.;
            }
            _ => {}
        }
    }
}

impl Cyclomatic for RustCode {
    fn compute(node: &Node, stats: &mut Stats) {
        use Rust::*;

        match node.kind_id().into() {
            If | For | While | Loop | MatchArm | MatchArm2 | QMARK | AMPAMP | PIPEPIPE => {
                stats.cyclomatic += 1.;
            }
            _ => {}
        }
    }
}

impl Cyclomatic for CppCode {
    fn compute(node: &Node, stats: &mut Stats) {
        use Cpp::*;

        match node.kind_id().into() {
            If | For | While | Case | Catch | ConditionalExpression | AMPAMP | PIPEPIPE => {
                stats.cyclomatic += 1.;
            }
            _ => {}
        }
    }
}

impl Cyclomatic for PreprocCode {}
impl Cyclomatic for CcommentCode {}
impl Cyclomatic for CSharpCode {}
impl Cyclomatic for JavaCode {}
impl Cyclomatic for GoCode {}
impl Cyclomatic for CssCode {}
impl Cyclomatic for HtmlCode {}