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use serde::ser::{SerializeStruct, Serializer};
use serde::Serialize;
use std::fmt;
use super::cyclomatic;
use super::halstead;
use super::loc;
use crate::checker::Checker;
use crate::*;
#[derive(Default, Clone, Debug)]
pub struct Stats {
halstead_length: f64,
halstead_vocabulary: f64,
halstead_volume: f64,
cyclomatic: f64,
sloc: f64,
comments_percentage: f64,
}
impl Serialize for Stats {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
let mut st = serializer.serialize_struct("maintanability_index", 3)?;
st.serialize_field("mi_original", &self.mi_original())?;
st.serialize_field("mi_sei", &self.mi_sei())?;
st.serialize_field("mi_visual_studio", &self.mi_visual_studio())?;
st.end()
}
}
impl fmt::Display for Stats {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"mi_original: {}, mi_sei: {}, mi_visual_studio: {}",
self.mi_original(),
self.mi_sei(),
self.mi_visual_studio()
)
}
}
impl Stats {
pub(crate) fn merge(&mut self, _other: &Stats) {}
#[inline(always)]
pub fn mi_original(&self) -> f64 {
171.0 - 5.2 * (self.halstead_volume).ln() - 0.23 * self.cyclomatic - 16.2 * self.sloc.ln()
}
#[inline(always)]
pub fn mi_sei(&self) -> f64 {
171.0 - 5.2 * self.halstead_volume.log2() - 0.23 * self.cyclomatic - 16.2 * self.sloc.log2()
+ 50.0 * (self.comments_percentage * 2.4).sqrt().sin()
}
#[inline(always)]
pub fn mi_visual_studio(&self) -> f64 {
let formula = 171.0
- 5.2 * self.halstead_volume.ln()
- 0.23 * self.cyclomatic
- 16.2 * self.sloc.ln();
(formula * 100.0 / 171.0).max(0.)
}
}
#[doc(hidden)]
pub trait Mi
where
Self: Checker,
{
fn compute(
loc: &loc::Stats,
cyclomatic: &cyclomatic::Stats,
halstead: &halstead::Stats,
stats: &mut Stats,
) {
stats.halstead_length = halstead.length();
stats.halstead_vocabulary = halstead.vocabulary();
stats.halstead_volume = halstead.volume();
stats.cyclomatic = cyclomatic.cyclomatic_sum();
stats.sloc = loc.sloc();
stats.comments_percentage = loc.cloc() / stats.sloc;
}
}
impl Mi for RustCode {}
impl Mi for CppCode {}
impl Mi for PythonCode {}
impl Mi for MozjsCode {}
impl Mi for JavascriptCode {}
impl Mi for TypescriptCode {}
impl Mi for TsxCode {}
impl Mi for PreprocCode {}
impl Mi for CcommentCode {}
impl Mi for JavaCode {}
#[cfg(test)]
mod tests {
use std::path::PathBuf;
use super::*;
#[test]
fn check_mi_metrics() {
check_metrics!(
"def f():
pass",
"foo.py",
PythonParser,
mi,
[],
[
(mi_original, 151.203_315_883_223_2),
(mi_sei, 142.643_061_717_489_76),
(mi_visual_studio, 88.422_991_744_574_97),
]
);
}
}