Add support for noqa pragmas (#11)

Cargo.lock

@@ -13,6 +13,15 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "aho-corasick"
+version = "0.7.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "android_system_properties"
 version = "0.1.4"
@@ -1482,6 +1491,23 @@ dependencies = [
  "thiserror",
 ]
 
+[[package]]
+name = "regex"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c4eb3267174b8c6c2f654116623910a0fef09c4753f8dd83db29c48a0df988b"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a3f87b73ce11b1619a3c6332f45341e0047173771e8b8b73f87bfeefb7b56244"
+
 [[package]]
 name = "remove_dir_all"
 version = "0.5.3"
@@ -1507,6 +1533,7 @@ dependencies = [
  "notify",
  "pyo3",
  "rayon",
+ "regex",
  "rustpython-parser",
  "serde",
  "serde_json",

Cargo.toml

@@ -18,9 +18,10 @@ colored = { version = "2.0.0" }
 fern = { version = "0.6.1" }
 log = { version = "0.4.17" }
 notify = { version = "4.0.17" }
+pyo3 = { version = "0.16.5", features = ["extension-module", "abi3-py37"] }
 rayon = { version = "1.5.3" }
+regex = { version = "1.6.0" }
 rustpython-parser = { git = "https://github.com/RustPython/RustPython.git", rev = "dff916d45c5d13074d21ad329a5ab68a6499426a" }
 serde = { version = "1.0.143", features = ["derive"] }
 serde_json = { version = "1.0.83" }
 walkdir = { version = "2.3.2" }
-pyo3 = { version = "0.16.5", features = ["extension-module", "abi3-py37"] }

resources/test/src/import_star_usage.py

@@ -1 +1,6 @@
 from if_tuple import *
+from if_tuple import *  # noqa: E501
+
+from if_tuple import *  # noqa
+from if_tuple import *  # noqa: F403
+from if_tuple import *  # noqa: F403, E501

src/check_ast.rs

@@ -40,10 +40,10 @@ impl Visitor for Checker {
     fn visit_arguments(&mut self, arguments: &Arguments) {
         // Collect all the arguments into a single vector.
         let mut all_arguments: Vec<&Arg> = arguments
-            .posonlyargs
+            .args
             .iter()
+            .chain(arguments.posonlyargs.iter())
             .chain(arguments.kwonlyargs.iter())
-            .chain(arguments.args.iter())
             .collect();
         if let Some(arg) = &arguments.vararg {
             all_arguments.push(arg);

src/check_lines.rs

@@ -2,16 +2,17 @@ use rustpython_parser::ast::Location;
 
 use crate::checks::Check;
 use crate::checks::CheckKind::LineTooLong;
+use crate::settings::MAX_LINE_LENGTH;
 
 pub fn check_lines(contents: &str) -> Vec<Check> {
     contents
         .lines()
         .enumerate()
         .filter_map(|(row, line)| {
-            if line.len() > 79 {
+            if line.len() > *MAX_LINE_LENGTH {
                 Some(Check {
                     kind: LineTooLong,
-                    location: Location::new(row + 1, 79 + 1),
+                    location: Location::new(row + 1, MAX_LINE_LENGTH + 1),
                 })
             } else {
                 None

src/checks.rs

@@ -26,7 +26,7 @@ impl CheckKind {
             CheckKind::DuplicateArgumentName => "Duplicate argument name in function definition",
             CheckKind::IfTuple => "If test is a tuple, which is always `True`",
             CheckKind::ImportStarUsage => "Unable to detect undefined names",
-            CheckKind::LineTooLong => "Line too long (> 79 characters)",
+            CheckKind::LineTooLong => "Line too long",
         }
     }
 }

src/fs.rs

@@ -1,7 +1,8 @@
-use anyhow::Result;
 use std::fs::File;
-use std::io::{BufReader, Read};
+use std::io::{BufRead, BufReader, Read};
 use std::path::{Path, PathBuf};
+
+use anyhow::Result;
 use walkdir::{DirEntry, WalkDir};
 
 fn is_not_hidden(entry: &DirEntry) -> bool {
@@ -21,6 +22,16 @@ pub fn iter_python_files(path: &PathBuf) -> impl Iterator<Item = DirEntry> {
         .filter(|entry| entry.path().to_string_lossy().ends_with(".py"))
 }
 
+pub fn read_line(path: &Path, row: &usize) -> Result<String> {
+    let file = File::open(path)?;
+    let buf_reader = BufReader::new(file);
+    buf_reader
+        .lines()
+        .nth(*row - 1)
+        .unwrap()
+        .map_err(|e| e.into())
+}
+
 pub fn read_file(path: &Path) -> Result<String> {
     let file = File::open(path)?;
     let mut buf_reader = BufReader::new(file);

src/lib.rs

@@ -6,4 +6,5 @@ pub mod fs;
 pub mod linter;
 pub mod logging;
 pub mod message;
+mod settings;
 mod visitor;

src/linter.rs

@@ -29,6 +29,7 @@ pub fn check_path(path: &Path, mode: &cache::Mode) -> Result<Vec<Message>> {
             location: check.location,
             filename: path.to_string_lossy().to_string(),
         })
+        .filter(|message| !message.is_inline_ignored())
         .collect();
     cache::set(path, &messages, mode);
 
@@ -61,7 +62,7 @@ mod tests {
             },
             Message {
                 kind: DuplicateArgumentName,
-                location: Location::new(5, 9),
+                location: Location::new(5, 28),
                 filename: "./resources/test/src/duplicate_argument_name.py".to_string(),
             },
             Message {
@@ -110,11 +111,18 @@ mod tests {
             &Path::new("./resources/test/src/import_star_usage.py"),
             &cache::Mode::None,
         )?;
-        let expected = vec![Message {
+        let expected = vec![
+            Message {
                 kind: ImportStarUsage,
                 location: Location::new(1, 1),
                 filename: "./resources/test/src/import_star_usage.py".to_string(),
-        }];
+            },
+            Message {
+                kind: ImportStarUsage,
+                location: Location::new(2, 1),
+                filename: "./resources/test/src/import_star_usage.py".to_string(),
+            },
+        ];
         assert_eq!(actual.len(), expected.len());
         for i in 1..actual.len() {
             assert_eq!(actual[i], expected[i]);
@@ -131,7 +139,7 @@ mod tests {
         )?;
         let expected = vec![Message {
             kind: LineTooLong,
-            location: Location::new(3, 80),
+            location: Location::new(3, 88),
             filename: "./resources/test/src/line_too_long.py".to_string(),
         }];
         assert_eq!(actual.len(), expected.len());

src/message.rs

@@ -1,10 +1,13 @@
 use std::fmt;
+use std::path::Path;
 
 use colored::Colorize;
+use regex::Regex;
 use rustpython_parser::ast::Location;
 use serde::{Deserialize, Serialize};
 
 use crate::checks::CheckKind;
+use crate::fs;
 
 #[derive(Serialize, Deserialize)]
 #[serde(remote = "Location")]
@@ -29,6 +32,38 @@ pub struct Message {
     pub filename: String,
 }
 
+impl Message {
+    pub fn is_inline_ignored(&self) -> bool {
+        match fs::read_line(Path::new(&self.filename), &self.location.row()) {
+            Ok(line) => {
+                // https://github.com/PyCQA/flake8/blob/799c71eeb61cf26c7c176aed43e22523e2a6d991/src/flake8/defaults.py#L26
+                let re = Regex::new(r"(?i)# noqa(?::\s?(?P<codes>([A-Z]+[0-9]+(?:[,\s]+)?)+))?")
+                    .unwrap();
+                match re.captures(&line) {
+                    Some(caps) => match caps.name("codes") {
+                        Some(codes) => {
+                            let re = Regex::new(r"[,\s]").unwrap();
+                            for code in re
+                                .split(codes.as_str())
+                                .map(|code| code.trim())
+                                .filter(|code| !code.is_empty())
+                            {
+                                if code == self.kind.code() {
+                                    return true;
+                                }
+                            }
+                            false
+                        }
+                        None => true,
+                    },
+                    None => false,
+                }
+            }
+            Err(_) => false,
+        }
+    }
+}
+
 impl fmt::Display for Message {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(

src/settings.rs

@@ -0,0 +1 @@
+pub static MAX_LINE_LENGTH: &usize = &88;