Add mostly working BSON support (missing some types)

src/commands/from_bson.rs

@@ -0,0 +1,148 @@
+use crate::commands::WholeStreamCommand;
+use crate::object::base::OF64;
+use crate::object::{Primitive, TaggedDictBuilder, Value};
+use crate::prelude::*;
+use bson::{decode_document, Bson};
+
+pub struct FromBSON;
+
+impl WholeStreamCommand for FromBSON {
+    fn run(
+        &self,
+        args: CommandArgs,
+        registry: &CommandRegistry,
+    ) -> Result<OutputStream, ShellError> {
+        from_bson(args, registry)
+    }
+
+    fn name(&self) -> &str {
+        "from-bson"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build("from-bson")
+    }
+}
+
+fn convert_bson_value_to_nu_value(v: &Bson, tag: impl Into<Tag>) -> Tagged<Value> {
+    let tag = tag.into();
+
+    match v {
+        Bson::FloatingPoint(n) => Value::Primitive(Primitive::Float(OF64::from(*n))).tagged(tag),
+        Bson::String(s) => Value::Primitive(Primitive::String(String::from(s))).tagged(tag),
+        Bson::Array(a) => Value::List(
+            a.iter()
+                .map(|x| convert_bson_value_to_nu_value(x, tag))
+                .collect(),
+        )
+        .tagged(tag),
+        Bson::Document(doc) => {
+            let mut collected = TaggedDictBuilder::new(tag);
+            for (k, v) in doc.iter() {
+                collected.insert_tagged(k.clone(), convert_bson_value_to_nu_value(v, tag));
+            }
+
+            collected.into_tagged_value()
+        }
+        Bson::Boolean(b) => Value::Primitive(Primitive::Boolean(*b)).tagged(tag),
+        Bson::Null => Value::Primitive(Primitive::String(String::from(""))).tagged(tag),
+        //        Bson::RegExp(r, opts) => {
+        //            let mut collected = TaggedDictBuilder::new(tag);
+        //            collected.insert_tagged(
+        //                "$regex".to_owned(),
+        //                Value::Primitive(Primitive::String(String::from(r))),
+        //            );
+        //            collected.insert_tagged(
+        //                "$options".to_owned(),
+        //                Value::Primitive(Primitive::String(String::from(opts))),
+        //            );
+        //            collected.into_tagged_value()
+        //        }
+        Bson::I32(n) => Value::Primitive(Primitive::Int(*n as i64)).tagged(tag),
+        Bson::I64(n) => Value::Primitive(Primitive::Int(*n as i64)).tagged(tag),
+        Bson::ObjectId(obj_id) => Value::Primitive(Primitive::String(obj_id.to_hex())).tagged(tag),
+        x => {
+            println!("{:?}", x);
+            panic!()
+        }
+    }
+}
+
+#[derive(Debug)]
+struct BytesReader {
+    pos: usize,
+    inner: Vec<u8>,
+}
+
+impl BytesReader {
+    fn new(bytes: Vec<u8>) -> BytesReader {
+        BytesReader {
+            pos: 0,
+            inner: bytes,
+        }
+    }
+}
+
+impl std::io::Read for BytesReader {
+    fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
+        let src: &mut &[u8] = &mut self.inner[self.pos..].as_ref();
+        let diff = src.read(buf)?;
+        self.pos += diff;
+        Ok(diff)
+    }
+}
+
+pub fn from_bson_bytes_to_value(
+    bytes: Vec<u8>,
+    tag: impl Into<Tag> + std::clone::Clone,
+) -> bson::DecoderResult<Tagged<Value>> {
+    let mut out = Vec::new();
+    let mut b_reader = BytesReader::new(bytes);
+    while let Ok(v) = decode_document(&mut b_reader) {
+        out.push(convert_bson_value_to_nu_value(
+            &Bson::Document(v),
+            tag.clone(),
+        ));
+    }
+    Ok(Value::List(out).tagged(tag))
+}
+
+fn from_bson(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
+    let args = args.evaluate_once(registry)?;
+    let span = args.name_span();
+    let input = args.input;
+
+    let stream = async_stream_block! {
+        let values: Vec<Tagged<Value>> = input.values.collect().await;
+
+        for value in values {
+            let value_tag = value.tag();
+            latest_tag = Some(value_tag);
+            match value.item {
+                Value::Binary(vb) =>
+                    match from_bson_bytes_to_value(vb, span) {
+                        Ok(x) => yield ReturnSuccess::value(x),
+                        Err(_) => if let Some(last_tag) = latest_tag {
+                            yield Err(ShellError::labeled_error_with_secondary(
+                                "Could not parse as BSON",
+                                "input cannot be parsed as BSON",
+                                span,
+                                "value originates from here",
+                                last_tag.span,
+                            ))
+                        }
+                    }
+                _ => yield Err(ShellError::labeled_error_with_secondary(
+                    "Expected a string from pipeline",
+                    "requires string input",
+                    span,
+                    "value originates from here",
+                    value_tag.span,
+                )),
+
+            }
+        }
+    };
+
+    Ok(stream.to_output_stream())
+}

src/commands/open.rs

@@ -501,19 +501,17 @@ pub fn parse_binary_as_value(
     contents_tag: Tag,
     name_span: Span,
 ) -> Result<Tagged<Value>, ShellError> {
-    println!("{:?}", extension);
     match extension {
         Some(x) if x == "bson" => {
-            Err(ShellError::labeled_error("Could not open as BSON", "Could not open as BSON", name_span))
-            //crate::commands::from_json::from_bson_bytes_to_value(contents, contents_tag).map_err(
-            //    move |_| {
-            //        ShellError::labeled_error(
-             //           "Could not open as BSON",
-             //           "could not open as BSON",
-             //           name_span,
-             //       )
-            //    },
-           // )
+            crate::commands::from_bson::from_bson_bytes_to_value(contents, contents_tag).map_err(
+                move |_| {
+                    ShellError::labeled_error(
+                       "Could not open as BSON",
+                       "could not open as BSON",
+                       name_span,
+                    )
+                },
+            )
         }
         _ => Ok(Value::Binary(contents).tagged(contents_tag)),
     }