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use crate::diagnostic::LintDiagnostic;
use crate::diagnostic::Location;
use crate::rules::LintRule;
use crate::swc_util;
use crate::swc_util::AstParser;
use crate::swc_util::SwcDiagnosticBuffer;
use std::sync::Arc;
use std::sync::Mutex;
use swc_common::comments::Comment;
use swc_common::comments::CommentKind;
use swc_common::comments::CommentMap;
use swc_common::comments::Comments;
use swc_common::SourceMap;
use swc_common::Span;
#[derive(Clone)]
pub struct Context {
pub file_name: String,
pub diagnostics: Arc<Mutex<Vec<LintDiagnostic>>>,
pub source_map: Arc<SourceMap>,
pub leading_comments: CommentMap,
pub trailing_comments: CommentMap,
}
impl Context {
pub fn add_diagnostic(&self, span: Span, code: &str, message: &str) {
let location = self.source_map.lookup_char_pos(span.lo());
let mut diags = self.diagnostics.lock().unwrap();
let line_src = self
.source_map
.lookup_source_file(span.lo())
.get_line(location.line - 1)
.expect("error loading line soruce")
.to_string();
let snippet_length = self
.source_map
.span_to_snippet(self.source_map.span_until_char(span, '\n'))
.expect("error loading snippet")
.len();
diags.push(LintDiagnostic {
location: location.into(),
message: message.to_string(),
code: code.to_string(),
line_src,
snippet_length,
});
}
}
#[derive(Debug)]
pub struct IgnoreDirective {
location: Location,
codes: Vec<String>,
}
impl IgnoreDirective {
pub fn should_ignore_diagnostic(&self, diagnostic: &LintDiagnostic) -> bool {
if self.location.filename != diagnostic.location.filename {
return false;
}
if self.location.line != diagnostic.location.line - 1 {
return false;
}
self.codes.contains(&diagnostic.code)
}
}
pub struct Linter {
pub ast_parser: AstParser,
}
impl Linter {
pub fn default() -> Self {
let ast_parser = AstParser::new();
Linter { ast_parser }
}
pub fn lint(
&mut self,
file_name: String,
source_code: String,
rules: Vec<Box<dyn LintRule>>,
) -> Result<Vec<LintDiagnostic>, SwcDiagnosticBuffer> {
let syntax = swc_util::get_default_ts_config();
self.ast_parser.parse_module(
&file_name,
syntax,
&source_code,
|parse_result, comments| {
let module = parse_result?;
let diagnostics =
self.lint_module(file_name.clone(), module, comments, rules);
Ok(diagnostics)
},
)
}
fn parse_ignore_comment(&self, comment: &Comment) -> Option<IgnoreDirective> {
if comment.kind != CommentKind::Line {
return None;
}
let comment_text = comment.text.trim();
let codes: Vec<String> = if comment_text.starts_with("deno-lint-ignore") {
comment_text
.split(' ')
.map(|e| e.to_string())
.skip(1)
.collect()
} else {
return None;
};
let location = self
.ast_parser
.source_map
.lookup_char_pos(comment.span.lo());
Some(IgnoreDirective {
location: location.into(),
codes,
})
}
fn lint_module(
&self,
file_name: String,
module: swc_ecma_ast::Module,
comments: Comments,
rules: Vec<Box<dyn LintRule>>,
) -> Vec<LintDiagnostic> {
let (leading, trailing) = comments.take_all();
let context = Context {
file_name,
diagnostics: Arc::new(Mutex::new(vec![])),
source_map: self.ast_parser.source_map.clone(),
leading_comments: leading,
trailing_comments: trailing,
};
for rule in rules {
rule.lint_module(context.clone(), module.clone());
}
let mut ignore_directives = vec![];
context.leading_comments.iter().for_each(|ref_multi| {
for comment in ref_multi.value() {
if let Some(ignore) = self.parse_ignore_comment(comment) {
ignore_directives.push(ignore);
}
}
});
let diags = context.diagnostics.lock().unwrap();
let mut filtered_diagnostics: Vec<LintDiagnostic> = diags
.as_slice()
.iter()
.cloned()
.filter(|diagnostic| {
!ignore_directives.iter().any(|ignore_directive| {
ignore_directive.should_ignore_diagnostic(&diagnostic)
})
})
.collect();
filtered_diagnostics.sort_by(|a, b| a.location.line.cmp(&b.location.line));
filtered_diagnostics
}
}