Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 176 insertions, 0 deletions

diff --git a/third_party/rust/jsparagus-emitter/src/array_emitter.rs b/third_party/rust/jsparagus-emitter/src/array_emitter.rs
new file mode 100644
index 0000000000..b44137182e
--- /dev/null
+++ b/third_party/rust/jsparagus-emitter/src/array_emitter.rs
@@ -0,0 +1,176 @@
+use crate::ast_emitter::AstEmitter;
+use crate::emitter::EmitError;
+
+/// Struct for emitting bytecode for an array element.
+pub struct ArrayElementEmitter<'a, F>
+where
+    F: Fn(&mut AstEmitter) -> Result<(), EmitError>,
+{
+    pub state: &'a mut ArrayEmitterState,
+    pub elem: F,
+}
+
+impl<'a, F> ArrayElementEmitter<'a, F>
+where
+    F: Fn(&mut AstEmitter) -> Result<(), EmitError>,
+{
+    pub fn emit(self, emitter: &mut AstEmitter) -> Result<(), EmitError> {
+        //              [stack] ARRAY INDEX?
+
+        (self.elem)(emitter)?;
+        //              [stack] ARRAY INDEX? ELEM
+
+        match &mut self.state.0 {
+            ArrayEmitterStateInternal::BeforeSpread { ref mut index } => {
+                emitter.emit.init_elem_array(*index);
+                //      [stack] ARRAY
+
+                *index += 1;
+            }
+            ArrayEmitterStateInternal::AfterSpread => {
+                emitter.emit.init_elem_inc();
+                //      [stack] ARRAY INDEX+1
+            }
+        }
+
+        //              [stack] ARRAY INDEX?
+
+        Ok(())
+    }
+}
+
+/// Struct for emitting bytecode for an array element with hole.
+pub struct ArrayElisionEmitter<'a> {
+    pub state: &'a mut ArrayEmitterState,
+}
+
+impl<'a> ArrayElisionEmitter<'a> {
+    pub fn emit(self, emitter: &mut AstEmitter) {
+        //              [stack] ARRAY INDEX?
+
+        emitter.emit.hole();
+        //              [stack] ARRAY INDEX? HOLE
+
+        match &mut self.state.0 {
+            ArrayEmitterStateInternal::BeforeSpread { ref mut index } => {
+                emitter.emit.init_elem_array(*index);
+                //      [stack] ARRAY
+
+                *index += 1;
+            }
+            ArrayEmitterStateInternal::AfterSpread => {
+                emitter.emit.init_elem_inc();
+                //      [stack] ARRAY INDEX+1
+            }
+        }
+
+        //              [stack] ARRAY INDEX?
+    }
+}
+
+/// Struct for emitting bytecode for an array element with spread.
+pub struct ArraySpreadEmitter<'a, F>
+where
+    F: Fn(&mut AstEmitter) -> Result<(), EmitError>,
+{
+    pub state: &'a mut ArrayEmitterState,
+    pub elem: F,
+}
+
+impl<'a, F> ArraySpreadEmitter<'a, F>
+where
+    F: Fn(&mut AstEmitter) -> Result<(), EmitError>,
+{
+    pub fn emit(self, emitter: &mut AstEmitter) -> Result<(), EmitError> {
+        //              [stack] ARRAY INDEX?
+
+        match self.state.0 {
+            ArrayEmitterStateInternal::BeforeSpread { index } => {
+                emitter.emit.numeric(index as f64);
+            }
+            _ => {}
+        }
+        self.state.0 = ArrayEmitterStateInternal::AfterSpread;
+
+        //              [stack] ARRAY INDEX
+
+        Err(EmitError::NotImplemented("TODO: spread element"))
+    }
+}
+
+enum ArrayEmitterStateInternal {
+    BeforeSpread { index: u32 },
+    AfterSpread,
+}
+
+/// Opaque struct that can be created only by ArrayEmitter.
+/// This guarantees that Array*Emitter structs cannot be used outside
+/// of ArrayEmitter callback.
+pub struct ArrayEmitterState(ArrayEmitterStateInternal);
+
+impl ArrayEmitterState {
+    fn new() -> Self {
+        Self(ArrayEmitterStateInternal::BeforeSpread { index: 0 })
+    }
+}
+
+pub enum ArrayElementKind {
+    Normal,
+    Elision,
+    Spread,
+}
+
+/// Struct for emitting bytecode for an array expression.
+pub struct ArrayEmitter<'a, ElemT, ElemKindF, ElemF>
+where
+    ElemKindF: Fn(&ElemT) -> ArrayElementKind,
+    ElemF: Fn(&mut AstEmitter, &mut ArrayEmitterState, &'a ElemT) -> Result<(), EmitError>,
+{
+    pub elements: std::slice::Iter<'a, ElemT>,
+    pub elem_kind: ElemKindF,
+    pub elem: ElemF,
+}
+
+impl<'a, ElemT, ElemKindF, ElemF> ArrayEmitter<'a, ElemT, ElemKindF, ElemF>
+where
+    ElemKindF: Fn(&ElemT) -> ArrayElementKind,
+    ElemF: Fn(&mut AstEmitter, &mut ArrayEmitterState, &'a ElemT) -> Result<(), EmitError>,
+{
+    pub fn emit(self, emitter: &mut AstEmitter) -> Result<(), EmitError> {
+        //              [stack]
+
+        // Initialize the array to its minimum possible length.
+        let min_length = self
+            .elements
+            .clone()
+            .map(|e| match (self.elem_kind)(e) {
+                ArrayElementKind::Normal => 1,
+                ArrayElementKind::Elision => 1,
+                ArrayElementKind::Spread => 0,
+            })
+            .sum::<u32>();
+
+        emitter.emit.new_array(min_length);
+        //              [stack] ARRAY
+
+        let mut state = ArrayEmitterState::new();
+        for element in self.elements {
+            (self.elem)(emitter, &mut state, element)?;
+            //          [stack] ARRAY INDEX?
+        }
+
+        match state.0 {
+            ArrayEmitterStateInternal::AfterSpread => {
+                //      [stack] ARRAY INDEX
+
+                emitter.emit.pop();
+                //      [stack] ARRAY
+            }
+            _ => {}
+        }
+
+        //              [stack] ARRAY
+
+        Ok(())
+    }
+}