use crate::config::{Config, Thresholds};
use globset::{Glob, GlobMatcher};
use std::path::Path;
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum Role {
App,
Library,
Test,
Script,
Generated,
Vendor,
}
pub struct RoleDetector {
patterns: Vec<RolePattern>,
}
impl RoleDetector {
pub fn new(config: &Config) -> Result<Self, globset::Error> {
let mut patterns = Vec::new();
add_patterns(&mut patterns, Role::Test, &config.roles.test.paths)?;
add_patterns(&mut patterns, Role::Library, &config.roles.library.paths)?;
add_patterns(&mut patterns, Role::Script, &config.roles.script.paths)?;
add_patterns(
&mut patterns,
Role::Generated,
&config.roles.generated.paths,
)?;
add_patterns(&mut patterns, Role::Vendor, &config.roles.vendor.paths)?;
Ok(Self { patterns })
}
pub fn detect(&self, path: &Path, source: &str) -> Role {
explicit_pragma_role(source)
.or_else(|| self.glob_role(path))
.or_else(|| heuristic_role(path))
.unwrap_or(Role::App)
}
fn glob_role(&self, path: &Path) -> Option<Role> {
self.patterns
.iter()
.filter(|pattern| pattern.matcher.is_match(path))
.max_by_key(|pattern| pattern.specificity)
.map(|pattern| pattern.role)
}
}
struct RolePattern {
role: Role,
matcher: GlobMatcher,
specificity: usize,
}
fn add_patterns(
patterns: &mut Vec<RolePattern>,
role: Role,
globs: &[String],
) -> Result<(), globset::Error> {
for pattern in globs {
patterns.push(RolePattern {
role,
matcher: Glob::new(pattern)?.compile_matcher(),
specificity: pattern
.chars()
.filter(|c| !matches!(c, '*' | '?' | '[' | ']'))
.count(),
});
}
Ok(())
}
fn explicit_pragma_role(source: &str) -> Option<Role> {
source
.lines()
.take(8)
.filter_map(comment_text)
.find_map(parse_role_pragma)
}
fn comment_text(line: &str) -> Option<&str> {
let trimmed = line.trim_start();
trimmed
.strip_prefix('#')
.or_else(|| trimmed.strip_prefix("//"))
.or_else(|| trimmed.strip_prefix("/*"))
.map(str::trim)
}
fn parse_role_pragma(comment: &str) -> Option<Role> {
let lower = comment
.trim()
.trim_end_matches("*/")
.trim()
.to_ascii_lowercase();
let value = if let Some(rest) = lower.strip_prefix("pretender:") {
let (key, value) = rest.split_once('=')?;
(key.trim() == "role").then_some(value.trim())?
} else {
lower.strip_prefix("pretender-role:").map(str::trim)?
};
Role::parse(value)
}
impl Role {
fn parse(value: &str) -> Option<Self> {
match value.trim() {
"app" => Some(Self::App),
"library" | "lib" => Some(Self::Library),
"test" | "tests" | "spec" => Some(Self::Test),
"script" | "scripts" => Some(Self::Script),
"generated" => Some(Self::Generated),
"vendor" => Some(Self::Vendor),
_ => None,
}
}
}
fn heuristic_role(path: &Path) -> Option<Role> {
let normalized = path
.to_string_lossy()
.replace('\\', "/")
.to_ascii_lowercase();
let file_name = path
.file_name()
.and_then(|name| name.to_str())
.unwrap_or_default()
.to_ascii_lowercase();
if normalized.contains("/vendor/")
|| normalized.starts_with("vendor/")
|| normalized.contains("/node_modules/")
|| normalized.starts_with("node_modules/")
{
Some(Role::Vendor)
} else if file_name.ends_with("_generated.py")
|| file_name.ends_with("_generated.js")
|| file_name.ends_with("_generated.ts")
|| file_name.ends_with("_generated.rs")
|| file_name.ends_with(".pb.go")
{
Some(Role::Generated)
} else if normalized.starts_with("tests/")
|| normalized.contains("/tests/")
|| normalized.starts_with("spec/")
|| normalized.contains("/spec/")
|| file_name.contains("_test.")
{
Some(Role::Test)
} else if normalized.starts_with("pkg/")
|| normalized.contains("/pkg/")
|| normalized.starts_with("lib/")
|| normalized.contains("/lib/")
{
Some(Role::Library)
} else if normalized.starts_with("scripts/")
|| normalized.contains("/scripts/")
|| normalized.starts_with("examples/")
|| normalized.contains("/examples/")
{
Some(Role::Script)
} else {
None
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct EffectiveThresholds {
pub cyclomatic_max: u32,
pub cognitive_max: u32,
pub function_lines_max: u32,
pub file_lines_max: u32,
pub nesting_max: u32,
pub params_max: u32,
pub duplication_pct_max: u32,
pub abc_max: u32,
pub min_assertions: Option<u32>,
pub exported_params_max: Option<u32>,
pub exported_cyclomatic_max: Option<u32>,
pub exported_lines_max: Option<u32>,
pub require_docstring: bool,
}
impl EffectiveThresholds {
pub fn for_role(role: Role, thresholds: &Thresholds) -> Self {
let mut effective = Self::from_app(thresholds);
match role {
Role::App | Role::Generated | Role::Vendor => {}
Role::Test => {
effective.cyclomatic_max = thresholds.test.cyclomatic_max;
effective.cognitive_max = thresholds.test.cognitive_max;
effective.function_lines_max = thresholds.test.function_lines_max;
effective.nesting_max = thresholds.test.nesting_max;
effective.params_max = thresholds.test.params_max;
effective.duplication_pct_max = thresholds.test.duplication_pct_max;
effective.min_assertions = thresholds.test.min_assertions;
}
Role::Library => {
effective.exported_params_max = Some(thresholds.library.exported_params_max);
effective.exported_cyclomatic_max =
Some(thresholds.library.exported_cyclomatic_max);
effective.exported_lines_max = Some(thresholds.library.exported_lines_max);
effective.require_docstring = thresholds.library.require_docstring;
}
Role::Script => {
effective.function_lines_max = thresholds.script.function_lines_max;
effective.file_lines_max = thresholds.script.file_lines_max;
}
}
effective
}
fn from_app(thresholds: &Thresholds) -> Self {
Self {
cyclomatic_max: thresholds.app.cyclomatic_max,
cognitive_max: thresholds.app.cognitive_max,
function_lines_max: thresholds.app.function_lines_max,
file_lines_max: thresholds.app.file_lines_max,
nesting_max: thresholds.app.nesting_max,
params_max: thresholds.app.params_max,
duplication_pct_max: thresholds.app.duplication_pct_max,
abc_max: thresholds.app.abc_max,
min_assertions: None,
exported_params_max: None,
exported_cyclomatic_max: None,
exported_lines_max: None,
require_docstring: false,
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::config::Config;
use std::path::Path;
#[test]
fn explicit_pragma_overrides_path_globs() {
let detector = RoleDetector::new(&Config::default()).expect("valid default role globs");
let role = detector.detect(
Path::new("tests/generated/example_generated.py"),
"# pretender: role=library\ndef helper(): pass\n",
);
assert_eq!(role, Role::Library);
}
#[test]
fn pragma_accepts_whitespace_and_block_comment_syntax() {
let detector = RoleDetector::new(&Config::default()).expect("valid default role globs");
assert_eq!(
detector.detect(
Path::new("src/generated.pb.go"),
"/* pretender: role = vendor */\n"
),
Role::Vendor
);
}
#[test]
fn configured_path_globs_override_heuristics() {
let config = Config::load_from_str(
r#"
[roles]
script = { paths = ["tests/manual/**"] }
"#,
)
.expect("config parses");
let detector = RoleDetector::new(&config).expect("valid configured role globs");
let role = detector.detect(Path::new("tests/manual/demo.py"), "def demo(): pass\n");
assert_eq!(role, Role::Script);
}
#[test]
fn falls_back_to_heuristics_then_app() {
let config = Config::load_from_str(
r#"
[roles]
test = { paths = [] }
library = { paths = [] }
script = { paths = [] }
generated = { paths = [] }
vendor = { paths = [] }
"#,
)
.expect("config parses");
let detector = RoleDetector::new(&config).expect("empty globs are valid");
assert_eq!(detector.detect(Path::new("spec/widget.py"), ""), Role::Test);
assert_eq!(detector.detect(Path::new("src/widget.py"), ""), Role::App);
}
#[test]
fn role_thresholds_apply_overrides_before_metric_evaluation() {
let config = Config::default();
let app = EffectiveThresholds::for_role(Role::App, &config.thresholds);
let test = EffectiveThresholds::for_role(Role::Test, &config.thresholds);
let library = EffectiveThresholds::for_role(Role::Library, &config.thresholds);
let script = EffectiveThresholds::for_role(Role::Script, &config.thresholds);
assert_eq!(app.cyclomatic_max, 10);
assert_eq!(test.cyclomatic_max, 3);
assert_eq!(test.min_assertions, Some(1));
assert_eq!(library.exported_cyclomatic_max, Some(8));
assert!(library.require_docstring);
assert_eq!(script.function_lines_max, 100);
}
}