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use std::{fmt, sync::Arc, sync::RwLock};use swc_common::{  errors::{Diagnostic, DiagnosticBuilder, Emitter},  Loc, Span,};
/// A buffer for collecting errors from the AST parser.#[derive(Debug, Clone)]pub struct ErrorBuffer(Arc<RwLock<Vec<Diagnostic>>>);
impl ErrorBuffer {  pub fn new() -> Self {    Self(Arc::new(RwLock::new(Vec::new())))  }}
impl Emitter for ErrorBuffer {  fn emit(&mut self, diagnostic_builder: &DiagnosticBuilder) {    self.0.write().unwrap().push((**diagnostic_builder).clone());  }}
/// A buffer for collecting diagnostic messages from the AST parser.#[derive(Debug)]pub struct DiagnosticBuffer(Vec<String>);
impl fmt::Display for DiagnosticBuffer {  fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {    fmt.pad(&self.0.join(","))  }}
impl DiagnosticBuffer {  pub fn from_error_buffer<F>(error_buffer: ErrorBuffer, get_loc: F) -> Self  where    F: Fn(Span) -> Loc,  {    let diagnostics = error_buffer.0.read().unwrap().clone();    let diagnostics = diagnostics      .iter()      .map(|d| {        let mut message = d.message();        if let Some(span) = d.span.primary_span() {          let loc = get_loc(span);          message = format!("{} at {}:{}", message, loc.line, loc.col_display);        }        message      })      .collect();
    Self(diagnostics)  }}