feat: make Debug readable (#70)

Author: Boshen

src/cached_source.rs

@@ -43,7 +43,6 @@ use crate::{helpers::StreamChunks, MapOptions, Source, SourceMap};
 ///   "Hello World\nconsole.log('test');\nconsole.log('test2');\nHello2\n"
 /// );
 /// ```
-#[derive(Debug)]
 pub struct CachedSource<T> {
   inner: Arc<T>,
   cached_buffer: OnceCell<Vec<u8>>,
@@ -159,6 +158,20 @@ impl<T: PartialEq> PartialEq for CachedSource<T> {
 
 impl<T: Eq> Eq for CachedSource<T> {}
 
+impl<T: std::fmt::Debug> std::fmt::Debug for CachedSource<T> {
+  fn fmt(
+    &self,
+    f: &mut std::fmt::Formatter<'_>,
+  ) -> Result<(), std::fmt::Error> {
+    f.debug_struct("CachedSource")
+      .field("inner", self.inner.as_ref())
+      .field("cached_buffer", &self.cached_buffer.get().is_some())
+      .field("cached_source", &self.cached_source.get().is_some())
+      .field("cached_maps", &(!self.cached_maps.is_empty()))
+      .finish()
+  }
+}
+
 #[cfg(test)]
 mod tests {
   use crate::{

src/original_source.rs

@@ -34,7 +34,7 @@ use crate::{
 ///   "AAAA;AACA",
 /// );
 /// ```
-#[derive(Debug, Clone, Eq)]
+#[derive(Clone, Eq)]
 pub struct OriginalSource {
   value: String,
   name: String,
@@ -86,6 +86,18 @@ impl PartialEq for OriginalSource {
   }
 }
 
+impl std::fmt::Debug for OriginalSource {
+  fn fmt(
+    &self,
+    f: &mut std::fmt::Formatter<'_>,
+  ) -> Result<(), std::fmt::Error> {
+    f.debug_struct("OriginalSource")
+      .field("name", &self.name)
+      .field("value", &self.value.chars().take(50).collect::<String>())
+      .finish()
+  }
+}
+
 impl StreamChunks for OriginalSource {
   fn stream_chunks(
     &self,

src/raw_source.rs

@@ -24,7 +24,7 @@ use crate::{
 /// assert_eq!(s.map(&MapOptions::default()), None);
 /// assert_eq!(s.size(), 16);
 /// ```
-#[derive(Debug, Clone, Eq)]
+#[derive(Clone, Eq)]
 pub enum RawSource {
   /// Represent buffer.
   Buffer(Vec<u8>),
@@ -114,6 +114,27 @@ impl PartialEq for RawSource {
   }
 }
 
+impl std::fmt::Debug for RawSource {
+  fn fmt(
+    &self,
+    f: &mut std::fmt::Formatter<'_>,
+  ) -> Result<(), std::fmt::Error> {
+    let mut d = f.debug_struct("RawSource");
+    match self {
+      Self::Buffer(buffer) => {
+        d.field(
+          "buffer",
+          &buffer.iter().take(50).copied().collect::<Vec<u8>>(),
+        );
+      }
+      Self::Source(string) => {
+        d.field("source", &string.chars().take(50).collect::<String>());
+      }
+    }
+    d.finish()
+  }
+}
+
 impl StreamChunks for RawSource {
   fn stream_chunks(
     &self,

src/replace_source.rs

@@ -34,7 +34,6 @@ use crate::{
 ///
 /// assert_eq!(source.source(), "start1\nstart2\nreplaced!\nend1\nend2");
 /// ```
-#[derive(Debug)]
 pub struct ReplaceSource<T> {
   inner: Arc<T>,
   inner_source_code: OnceCell<Box<str>>,
@@ -188,6 +187,28 @@ impl<T: Source + Hash + PartialEq + Eq + 'static> Source for ReplaceSource<T> {
   }
 }
 
+impl<T: std::fmt::Debug> std::fmt::Debug for ReplaceSource<T> {
+  fn fmt(
+    &self,
+    f: &mut std::fmt::Formatter<'_>,
+  ) -> Result<(), std::fmt::Error> {
+    f.debug_struct("ReplaceSource")
+      .field("inner", self.inner.as_ref())
+      .field(
+        "inner_source_code",
+        &self
+          .inner_source_code
+          .get()
+          .map(|s| s.chars().take(50).collect::<String>()),
+      )
+      .field(
+        "replacements",
+        &self.replacements.lock().iter().take(3).collect::<Vec<_>>(),
+      )
+      .finish()
+  }
+}
+
 impl<T: Source> StreamChunks for ReplaceSource<T> {
   fn mappings_size_hint(&self) -> usize {
     self.replacements.lock().len() * 2

src/source_map_source.rs

@@ -57,7 +57,7 @@ impl<V, N> From<WithoutOriginalOptions<V, N>> for SourceMapSourceOptions<V, N> {
 /// source map for the original source.
 ///
 /// - [webpack-sources docs](https://github.com/webpack/webpack-sources/#sourcemapsource).
-#[derive(Debug, Clone, Eq)]
+#[derive(Clone, Eq)]
 pub struct SourceMapSource {
   value: String,
   name: String,
@@ -134,6 +134,18 @@ impl PartialEq for SourceMapSource {
   }
 }
 
+impl std::fmt::Debug for SourceMapSource {
+  fn fmt(
+    &self,
+    f: &mut std::fmt::Formatter<'_>,
+  ) -> Result<(), std::fmt::Error> {
+    f.debug_struct("SourceMapSource")
+      .field("name", &self.name)
+      .field("value", &self.value.chars().take(50).collect::<String>())
+      .finish()
+  }
+}
+
 impl StreamChunks for SourceMapSource {
   fn stream_chunks(
     &self,