Attempt to add AstNodeRefMut, but failure.

ast-generator/src/ast_node/enum_ast_node.rs

@@ -1,37 +1,48 @@
+use crate::spec::tree_enum_spec::{
+    EnumRuleChildKind, TreeEnumBuildSpec, TreeEnumRule,
+};
 use convert_case::{Case, Casing};
-use crate::spec::tree_enum_spec::{EnumRuleChildKind, TreeEnumBuildSpec};
-use proc_macro2::TokenStream;
+use proc_macro2::{Ident, TokenStream};
 use quote::{format_ident, quote};
 
+fn make_match_arm(rule: &TreeEnumRule, type_ident: &Ident, is_mut: bool) -> TokenStream {
+    let rule_ident = format_ident!("{}", rule.rule());
+    match rule.child() {
+        Some(child) => match child.kind() {
+            EnumRuleChildKind::Node(node_child) => {
+                let child_ident = format_ident!("{}", node_child.node_kind().to_case(Case::Snake));
+                let as_node_ref_ident = if is_mut {
+                    quote! { as_node_ref_mut }
+                } else {
+                    quote! { as_node_ref }
+                };
+                quote! {
+                    #type_ident::#rule_ident(#child_ident) => vec![
+                        #child_ident.#as_node_ref_ident()
+                    ]
+                }
+            }
+            _ => quote! {
+                #type_ident::#rule_ident(_) => vec![]
+            },
+        },
+        None => {
+            quote! {
+                #type_ident::#rule_ident => vec![]
+            }
+        }
+    }
+}
+
 pub fn make_enum_ast_node_impl(enum_spec: &TreeEnumBuildSpec) -> TokenStream {
     let type_ident = format_ident!("{}", enum_spec.build());
     let match_arms = enum_spec
         .rules()
-        .map(|rule| {
-            let rule_ident = format_ident!("{}", rule.rule());
-            match rule.child() {
-                Some(child) => {
-                    match child.kind() {
-                        EnumRuleChildKind::Node(node_child) => {
-                            let child_ident = format_ident!("{}", node_child.node_kind().to_case(Case::Snake));
-                            quote! {
-                                #type_ident::#rule_ident(#child_ident) => vec![
-                                    #child_ident.as_node_ref()
-                                ]
-                            }
-                        }
-                        _ => quote! {
-                            #type_ident::#rule_ident(_) => vec![]
-                        }
-                    }
-                },
-                None => {
-                    quote! {
-                        #type_ident::#rule_ident => vec![]
-                    }
-                }
-            }
-        })
+        .map(|rule| make_match_arm(rule, &type_ident, false))
+        .collect::<Vec<_>>();
+    let match_arms_mut = enum_spec
+        .rules()
+        .map(|rule| make_match_arm(rule, &type_ident, true))
         .collect::<Vec<_>>();
 
     quote! {
@@ -42,9 +53,19 @@ pub fn make_enum_ast_node_impl(enum_spec: &TreeEnumBuildSpec) -> TokenStream {
                 }
             }
 
+            fn children_mut(&mut self) -> Vec<AstNodeRefMut> {
+                match self {
+                    #(#match_arms_mut,)*
+                }
+            }
+
             fn as_node_ref(&self) -> AstNodeRef {
                 AstNodeRef::#type_ident(&self)
             }
+
+            fn as_node_ref_mut(&mut self) -> AstNodeRefMut {
+                AstNodeRefMut::#type_ident(self)
+            }
         }
     }
 }

ast-generator/src/ast_node/leaf_enum_ast_node.rs

@@ -1,6 +1,6 @@
+use crate::spec::leaf_enum_spec::LeafEnumBuildSpec;
 use proc_macro2::TokenStream;
 use quote::{format_ident, quote};
-use crate::spec::leaf_enum_spec::LeafEnumBuildSpec;
 
 pub fn make_leaf_enum_ast_node_impl(spec: &LeafEnumBuildSpec) -> TokenStream {
     let type_ident = format_ident!("{}", spec.build());
@@ -10,9 +10,17 @@ pub fn make_leaf_enum_ast_node_impl(spec: &LeafEnumBuildSpec) -> TokenStream {
                 vec![]
             }
 
+            fn children_mut(&mut self) -> Vec<AstNodeRefMut> {
+                vec![]
+            }
+
             fn as_node_ref(&self) -> AstNodeRef {
                 AstNodeRef::#type_ident(&self)
             }
+
+            fn as_node_ref_mut(&mut self) -> AstNodeRefMut {
+                AstNodeRefMut::#type_ident(self)
+            }
         }
     }
 }

ast-generator/src/ast_node/leaf_struct_ast_node.rs

@@ -10,9 +10,17 @@ pub fn make_leaf_struct_ast_node_impl(spec: &LeafStructBuildSpec) -> TokenStream
                 vec![]
             }
 
+            fn children_mut(&mut self) -> Vec<AstNodeRefMut> {
+                vec![]
+            }
+
             fn as_node_ref(&self) -> AstNodeRef {
                 AstNodeRef::#type_ident(&self)
             }
+
+            fn as_node_ref_mut(&mut self) -> AstNodeRefMut {
+                AstNodeRefMut::#type_ident(self)
+            }
         }
     }
 }

ast-generator/src/ast_node/mod.rs

@@ -1,63 +1,47 @@
 mod enum_ast_node;
 mod leaf_enum_ast_node;
-mod struct_ast_node;
 mod leaf_struct_ast_node;
-mod polymorphic_type_ast_node;
 mod polymorphic_enum_loop_ast_node;
+mod polymorphic_type_ast_node;
+mod struct_ast_node;
 
-use crate::spec::BuildSpec;
-use proc_macro2::TokenStream;
-use quote::{format_ident, quote};
 use crate::ast_node::enum_ast_node::make_enum_ast_node_impl;
 use crate::ast_node::leaf_enum_ast_node::make_leaf_enum_ast_node_impl;
 use crate::ast_node::leaf_struct_ast_node::make_leaf_struct_ast_node_impl;
 use crate::ast_node::polymorphic_enum_loop_ast_node::make_polymorphic_enum_loop_ast_node_impl;
 use crate::ast_node::polymorphic_type_ast_node::make_polymorphic_type_ast_node_impl;
 use crate::ast_node::struct_ast_node::make_struct_ast_node_impl;
+use crate::spec::BuildSpec;
+use proc_macro2::{Ident, TokenStream};
+use quote::{format_ident, quote};
 
 pub fn make_ast_node_impl(build_spec: &BuildSpec) -> Option<TokenStream> {
     match build_spec {
-        BuildSpec::Enum(enum_spec) => {
-            Some(make_enum_ast_node_impl(enum_spec))
-        }
-        BuildSpec::LeafEnum(leaf_enum) => {
-            Some(make_leaf_enum_ast_node_impl(leaf_enum))
-        }
-        BuildSpec::Struct(struct_spec) => {
-            Some(make_struct_ast_node_impl(struct_spec))
-        }
-        BuildSpec::LeafStruct(leaf_struct) => {
-            Some(make_leaf_struct_ast_node_impl(leaf_struct))
-        }
+        BuildSpec::Enum(enum_spec) => Some(make_enum_ast_node_impl(enum_spec)),
+        BuildSpec::LeafEnum(leaf_enum) => Some(make_leaf_enum_ast_node_impl(leaf_enum)),
+        BuildSpec::Struct(struct_spec) => Some(make_struct_ast_node_impl(struct_spec)),
+        BuildSpec::LeafStruct(leaf_struct) => Some(make_leaf_struct_ast_node_impl(leaf_struct)),
         BuildSpec::Production(_) => None,
         BuildSpec::NodeProduction(_) => None,
         BuildSpec::PolymorphicType(polymorphic_type) => {
             Some(make_polymorphic_type_ast_node_impl(polymorphic_type))
         }
-        BuildSpec::PolymorphicEnumLoop(polymorphic_enum_loop) => {
-            Some(make_polymorphic_enum_loop_ast_node_impl(polymorphic_enum_loop))
-        }
+        BuildSpec::PolymorphicEnumLoop(polymorphic_enum_loop) => Some(
+            make_polymorphic_enum_loop_ast_node_impl(polymorphic_enum_loop),
+        ),
         BuildSpec::PolymorphicPassThrough(_) => None,
     }
 }
 
-pub fn make_ast_enum_member(build_spec: &BuildSpec) -> Option<TokenStream> { 
+fn make_ast_enum_ident(build_spec: &BuildSpec) -> Option<Ident> {
     match build_spec {
-        BuildSpec::Struct(struct_spec) => {
-            Some(format_ident!("{}", struct_spec.build()))
-        }
-        BuildSpec::LeafStruct(leaf_struct) => {
-            Some(format_ident!("{}", leaf_struct.build()))
-        }
-        BuildSpec::Enum(enum_spec) => {
-            Some(format_ident!("{}", enum_spec.build()))
-        }
-        BuildSpec::LeafEnum(leaf_enum) => {
-            Some(format_ident!("{}", leaf_enum.build()))
-        }
+        BuildSpec::Struct(struct_spec) => Some(format_ident!("{}", struct_spec.build())),
+        BuildSpec::LeafStruct(leaf_struct) => Some(format_ident!("{}", leaf_struct.build())),
+        BuildSpec::Enum(enum_spec) => Some(format_ident!("{}", enum_spec.build())),
+        BuildSpec::LeafEnum(leaf_enum) => Some(format_ident!("{}", leaf_enum.build())),
         BuildSpec::PolymorphicType(polymorphic_type) => {
             Some(format_ident!("{}", polymorphic_type.name()))
-        },
+        }
         BuildSpec::PolymorphicEnumLoop(polymorphic_enum_loop) => {
             Some(format_ident!("{}", polymorphic_enum_loop.name()))
         }
@@ -65,9 +49,20 @@ pub fn make_ast_enum_member(build_spec: &BuildSpec) -> Option<TokenStream> {
         BuildSpec::Production(_) => None,
         BuildSpec::NodeProduction(_) => None,
     }
-        .map(|type_ident| {
-            quote! {
-                #type_ident(&'a #type_ident)
-            }
-        })
+}
+
+pub fn make_ast_enum_member(build_spec: &BuildSpec) -> Option<TokenStream> {
+    make_ast_enum_ident(build_spec).map(|type_ident| {
+        quote! {
+            #type_ident(&'a #type_ident)
+        }
+    })
+}
+
+pub fn make_ast_enum_member_mut(build_spec: &BuildSpec) -> Option<TokenStream> {
+    make_ast_enum_ident(build_spec).map(|type_ident| {
+        quote! {
+            #type_ident(&'a mut #type_ident)
+        }
+    })
 }

ast-generator/src/ast_node/polymorphic_enum_loop_ast_node.rs

@@ -4,6 +4,33 @@ use crate::spec::polymorphic_enum_loop_spec::{
 use proc_macro2::TokenStream;
 use quote::{format_ident, quote};
 
+fn make_child_adder(child: &PolymorphicEnumLoopRuleBuildChild, is_mut: bool) -> TokenStream {
+    let child_ident = {
+        let base = match child {
+            PolymorphicEnumLoopRuleBuildChild::UseCurrent(use_current) => {
+                format_ident!("{}", use_current.name())
+            }
+            PolymorphicEnumLoopRuleBuildChild::OnEach(on_each) => {
+                format_ident!("{}", on_each.name())
+            }
+        };
+        if is_mut {
+            format_ident!("{}_mut", base)
+        } else {
+            base
+        }
+    };
+
+    let as_node_ref_ident = if is_mut {
+        quote! { as_node_ref_mut }
+    } else {
+        quote! { as_node_ref }
+    };
+    quote! {
+        children.push(self.#child_ident().#as_node_ref_ident());
+    }
+}
+
 pub fn make_polymorphic_enum_loop_ast_node_impl(
     spec: &PolymorphicEnumLoopBuildSpec,
 ) -> TokenStream {
@@ -18,19 +45,12 @@ pub fn make_polymorphic_enum_loop_ast_node_impl(
         .unwrap();
     let child_adders = build_rule
         .children()
-        .map(|child| {
-            let child_ident = match child {
-                PolymorphicEnumLoopRuleBuildChild::UseCurrent(use_current) => {
-                    format_ident!("{}", use_current.name())
-                }
-                PolymorphicEnumLoopRuleBuildChild::OnEach(on_each) => {
-                    format_ident!("{}", on_each.name())
-                }
-            };
-            quote! {
-                children.push(self.#child_ident().as_node_ref())
-            }
-        })
+        .map(|child| make_child_adder(child, false))
+        .collect::<Vec<_>>();
+
+    let child_adders_mut = build_rule
+        .children()
+        .map(|child| make_child_adder(child, true))
         .collect::<Vec<_>>();
 
     quote! {
@@ -41,9 +61,19 @@ pub fn make_polymorphic_enum_loop_ast_node_impl(
                 children
             }
 
+            fn children_mut(&mut self) -> Vec<AstNodeRefMut> {
+                let mut children: Vec<AstNodeRefMut> = vec![];
+                #(#child_adders_mut;)*
+                children
+            }
+
             fn as_node_ref(&self) -> AstNodeRef {
                 AstNodeRef::#type_ident(&self)
             }
+
+            fn as_node_ref_mut(&mut self) -> AstNodeRefMut {
+                AstNodeRefMut::#type_ident(self)
+            }
         }
     }
 }

ast-generator/src/ast_node/polymorphic_type_ast_node.rs

@@ -1,19 +1,36 @@
-use crate::spec::polymorphic_type_spec::PolymorphicTypeBuildSpec;
+use crate::spec::polymorphic_type_spec::{PolymorphicTypeBuildSpec, PolymorphicTypeVariant};
 use convert_case::{Case, Casing};
-use proc_macro2::TokenStream;
+use proc_macro2::{Ident, TokenStream};
 use quote::{format_ident, quote};
 
+fn make_match_arm(
+    variant: &PolymorphicTypeVariant,
+    type_ident: &Ident,
+    is_mut: bool,
+) -> TokenStream {
+    let variant_ident = format_ident!("{}", variant.name());
+    let child_ident = format_ident!("{}", variant.inner_kind().to_case(Case::Snake));
+    let as_node_ref_ident = if is_mut {
+        quote! { as_node_ref_mut }
+    } else {
+        quote! { as_node_ref }
+    };
+
+    quote! {
+        #type_ident::#variant_ident(#child_ident) => vec![#child_ident.#as_node_ref_ident()]
+    }
+}
+
 pub fn make_polymorphic_type_ast_node_impl(spec: &PolymorphicTypeBuildSpec) -> TokenStream {
     let type_ident = format_ident!("{}", spec.name());
     let match_arms = spec
         .variants()
-        .map(|variant| {
-            let variant_ident = format_ident!("{}", variant.name());
-            let child_ident = format_ident!("{}", variant.inner_kind().to_case(Case::Snake));
-            quote! {
-                #type_ident::#variant_ident(#child_ident) => vec![#child_ident.as_node_ref()]
-            }
-        })
+        .map(|variant| make_match_arm(variant, &type_ident, false))
+        .collect::<Vec<_>>();
+
+    let match_arms_mut = spec
+        .variants()
+        .map(|variant| make_match_arm(variant, &type_ident, true))
         .collect::<Vec<_>>();
 
     quote! {
@@ -24,9 +41,19 @@ pub fn make_polymorphic_type_ast_node_impl(spec: &PolymorphicTypeBuildSpec) -> T
                 }
             }
 
+            fn children_mut(&mut self) -> Vec<AstNodeRefMut> {
+                match self {
+                    #(#match_arms_mut,)*
+                }
+            }
+
             fn as_node_ref(&self) -> AstNodeRef {
                 AstNodeRef::#type_ident(&self)
             }
+
+            fn as_node_ref_mut(&mut self) -> AstNodeRefMut {
+                AstNodeRefMut::#type_ident(self)
+            }
         }
     }
 }

ast-generator/src/ast_node/struct_ast_node.rs

@@ -2,43 +2,69 @@ use crate::spec::struct_spec::{MemberChildBuild, StructChild, StructSpec, VecChi
 use proc_macro2::TokenStream;
 use quote::{format_ident, quote};
 
+fn make_child_adder(child: &StructChild, is_mut: bool) -> Option<TokenStream> {
+    let as_node_ref_ident = if is_mut {
+        format_ident!("as_node_ref_mut")
+    } else {
+        format_ident!("as_node_ref")
+    };
+
+    match child {
+        StructChild::SkipChild(_) => None,
+        StructChild::VecChild(vec_child) => match vec_child.build() {
+            VecChildBuild::String(_) => None,
+            VecChildBuild::Node(_) => {
+                let child_ident = if is_mut {
+                    format_ident!("{}_mut", vec_child.name())
+                } else {
+                    format_ident!("{}", vec_child.name())
+                };
+
+                let children_stream = quote! {
+                    for child in self.#child_ident().map(AstNode::#as_node_ref_ident) {
+                        children.push(child);
+                    }
+                };
+                Some(children_stream)
+            }
+        },
+        StructChild::MemberChild(member_child) => match member_child.build() {
+            MemberChildBuild::Node(_) => {
+                let child_ident = if is_mut {
+                    format_ident!("{}_mut", member_child.name())
+                } else {
+                    format_ident!("{}", member_child.name())
+                };
+                if member_child.optional() {
+                    Some(quote! {
+                        if let Some(#child_ident) = self.#child_ident() {
+                            children.push(#child_ident.#as_node_ref_ident());
+                        }
+                    })
+                } else {
+                    Some(quote! {
+                        children.push(self.#child_ident().#as_node_ref_ident());
+                    })
+                }
+            }
+            MemberChildBuild::Boolean(_) => None,
+        },
+        StructChild::Special(_) => None,
+    }
+}
+
 pub fn make_struct_ast_node_impl(spec: &StructSpec) -> TokenStream {
     let type_ident = format_ident!("{}", spec.build());
     let child_adders = spec
         .children()
-        .map(|child| match child {
-            StructChild::SkipChild(_) => None,
-            StructChild::VecChild(vec_child) => match vec_child.build() {
-                VecChildBuild::String(_) => None,
-                VecChildBuild::Node(_) => {
-                    let child_ident = format_ident!("{}", vec_child.name());
-                    let children_stream = quote! {
-                        for child in self.#child_ident().map(AstNode::as_node_ref) {
-                            children.push(child);
-                        }
-                    };
-                    Some(children_stream)
-                }
-            },
-            StructChild::MemberChild(member_child) => match member_child.build() {
-                MemberChildBuild::Node(_) => {
-                    let child_ident = format_ident!("{}", member_child.name());
-                    if member_child.optional() {
-                        Some(quote! {
-                            if let Some(#child_ident) = self.#child_ident() {
-                                children.push(#child_ident.as_node_ref());
-                            }
-                        })
-                    } else {
-                        Some(quote! {
-                            children.push(self.#child_ident().as_node_ref())
-                        })
-                    }
-                }
-                MemberChildBuild::Boolean(_) => None,
-            },
-            StructChild::Special(_) => None,
-        })
+        .map(|child| make_child_adder(child, false))
+        .filter(Option::is_some)
+        .map(Option::unwrap)
+        .collect::<Vec<_>>();
+
+    let child_adders_mut = spec
+        .children()
+        .map(|child| make_child_adder(child, true))
         .filter(Option::is_some)
         .map(Option::unwrap)
         .collect::<Vec<_>>();
@@ -51,9 +77,19 @@ pub fn make_struct_ast_node_impl(spec: &StructSpec) -> TokenStream {
                 children
             }
 
+            fn children_mut(&mut self) -> Vec<AstNodeRefMut> {
+                let mut children: Vec<AstNodeRefMut> = vec![];
+                #(#child_adders_mut;)*
+                children
+            }
+
             fn as_node_ref(&self) -> AstNodeRef {
                 AstNodeRef::#type_ident(&self)
             }
+
+            fn as_node_ref_mut(&mut self) -> AstNodeRefMut {
+                AstNodeRefMut::#type_ident(self)
+            }
         }
     }
 }

ast-generator/src/build_fn/struct_build_fn.rs

@@ -1,5 +1,8 @@
 use crate::deserialize::util::{make_build_fn_name, make_build_pair};
-use crate::spec::struct_spec::{MemberChildBuild, NodeMemberBuild, SpecialChild, SpecialChildKind, StructChild, StructSpec, VecChild, VecChildBuild};
+use crate::spec::struct_spec::{
+    MemberChildBuild, NodeMemberBuild, SpecialChild, SpecialChildKind, StructChild, StructSpec,
+    VecChild, VecChildBuild,
+};
 use proc_macro2::{Ident, TokenStream};
 use quote::{format_ident, quote};
 
@@ -125,7 +128,7 @@ fn make_rule_matcher(child_spec: &StructChild) -> Option<TokenStream> {
             Some(quote! {
                 Rule::#rule_ident => {}
             })
-        },
+        }
         StructChild::VecChild(vec_child) => {
             let rule_ident = format_ident!("{}", vec_child.rule());
             let action = make_vec_child_match_action(vec_child);
@@ -133,28 +136,24 @@ fn make_rule_matcher(child_spec: &StructChild) -> Option<TokenStream> {
                 Rule::#rule_ident => { #action }
             })
         }
-        StructChild::MemberChild(member_child) => {
-            match member_child.build() {
-                MemberChildBuild::Node(node_member_build) => {
-                    let rule_ident = format_ident!("{}", member_child.rule());
-                    let action = make_node_member_child_match_action(
-                        member_child.name(),
-                        node_member_build
-                    );
-                    Some(quote! {
-                        Rule::#rule_ident => { #action }
-                    })
-                }
-                MemberChildBuild::Boolean(_) => {
-                    let rule_ident = format_ident!("{}", member_child.rule());
-                    let action = make_boolean_member_child_match_action(member_child.name());
-                    Some(quote! {
-                        Rule::#rule_ident => { #action }
-                    })
-                }
+        StructChild::MemberChild(member_child) => match member_child.build() {
+            MemberChildBuild::Node(node_member_build) => {
+                let rule_ident = format_ident!("{}", member_child.rule());
+                let action =
+                    make_node_member_child_match_action(member_child.name(), node_member_build);
+                Some(quote! {
+                    Rule::#rule_ident => { #action }
+                })
+            }
+            MemberChildBuild::Boolean(_) => {
+                let rule_ident = format_ident!("{}", member_child.rule());
+                let action = make_boolean_member_child_match_action(member_child.name());
+                Some(quote! {
+                    Rule::#rule_ident => { #action }
+                })
             }
         },
-        StructChild::Special(_) => None
+        StructChild::Special(_) => None,
     }
 }
 
@@ -192,7 +191,7 @@ fn make_special_child_arg(special_child: &SpecialChild) -> TokenStream {
     quote! { #child_ident }
 }
 
-fn make_child_arg(child_spec: &StructChild, pair_ident: &Ident) -> Option<TokenStream> {
+fn make_child_arg(child_spec: &StructChild) -> Option<TokenStream> {
     match child_spec {
         StructChild::SkipChild(_) => None,
         StructChild::VecChild(vec_child) => Some(make_vec_child_arg(vec_child)),
@@ -204,7 +203,7 @@ fn make_child_arg(child_spec: &StructChild, pair_ident: &Ident) -> Option<TokenS
             )),
             MemberChildBuild::Boolean(_) => {
                 Some(make_boolean_member_child_arg(member_child.name()))
-            },
+            }
         },
         StructChild::Special(special_child) => Some(make_special_child_arg(special_child)),
     }
@@ -214,7 +213,7 @@ fn make_return_value_stream(build_spec: &StructSpec, pair_ident: &Ident) -> Toke
     let type_ident = format_ident!("{}", build_spec.build());
     let child_args = build_spec
         .children()
-        .map(|child| make_child_arg(child, pair_ident))
+        .map(|child| make_child_arg(child))
         .filter(|child_arg| child_arg.is_some())
         .map(|child_arg| child_arg.unwrap())
         .collect::<Vec<_>>();

ast-generator/src/deserialize/struct_spec.rs

@@ -5,6 +5,23 @@ use crate::deserialize::util::{get_as_bool, make_build_fn_name, unwrap_single_me
 use crate::spec::struct_spec::*;
 use yaml_rust2::Yaml;
 
+fn deserialize_fields(fields: &Yaml) -> Vec<Box<StructField>> {
+    fields
+        .as_vec()
+        .unwrap()
+        .iter()
+        .map(|field| unwrap_single_member_hash(field))
+        .map(|(name, props)| {
+            let kind = match props["kind"].as_str().unwrap() {
+                "usize" => StructFieldKind::USize,
+                _ => panic!()
+            };
+            StructField::new(&name, kind, get_as_bool(&props["optional"]))
+        })
+        .map(Box::new)
+        .collect()
+}
+
 fn deserialize_skip_child(props: &Yaml) -> StructChild {
     let rule = props["rule"].as_str().unwrap();
     StructChild::SkipChild(SkipChild::new(rule))
@@ -96,7 +113,11 @@ fn deserialize_special_child(name: &str, props: &Yaml) -> StructChild {
     match props["kind"].as_str().unwrap() {
         "file_id" => StructChild::Special(SpecialChild::new(name, SpecialChildKind::FileId)),
         "range" => StructChild::Special(SpecialChild::new(name, SpecialChildKind::Range)),
-        _ => panic!("Invalid special child kind {} in {}", props["kind"].as_str().unwrap(), name),
+        _ => panic!(
+            "Invalid special child kind {} in {}",
+            props["kind"].as_str().unwrap(),
+            name
+        ),
     }
 }
 
@@ -151,5 +172,11 @@ pub fn deserialize_struct_spec(name: &str, struct_yaml: &Yaml) -> StructSpec {
     } else {
         deserialize_error!("array", "children", name);
     };
-    StructSpec::new(name, children)
+    let fields = if struct_yaml["fields"].is_array() {
+        deserialize_fields(&struct_yaml["fields"])
+    } else {
+        vec![]
+    };
+
+    StructSpec::new(name, children, fields)
 }

ast-generator/src/lib.rs

@@ -6,7 +6,7 @@ mod spec;
 mod type_gen;
 mod walk;
 
-use crate::ast_node::{make_ast_enum_member, make_ast_node_impl};
+use crate::ast_node::{make_ast_enum_member, make_ast_enum_member_mut, make_ast_node_impl};
 use crate::build_fn::make_build_fn;
 use crate::deserialize::deserialize_yaml_spec;
 use crate::pretty_print::make_pretty_print_impl;
@@ -165,6 +165,13 @@ fn generate_ast_node_file(build_specs: &[BuildSpec]) -> AstGeneratedFile {
         .map(Option::unwrap)
         .collect::<Vec<_>>();
 
+    let ast_enum_members_mut = build_specs
+        .iter()
+        .map(|build_spec| make_ast_enum_member_mut(build_spec))
+        .filter(Option::is_some)
+        .map(Option::unwrap)
+        .collect::<Vec<_>>();
+
     let combined = quote! {
         use crate::ast::node::*;
 
@@ -172,10 +179,18 @@ fn generate_ast_node_file(build_specs: &[BuildSpec]) -> AstGeneratedFile {
             #(#ast_enum_members,)*
         }
 
+        pub enum AstNodeRefMut<'a> {
+            #(#ast_enum_members_mut,)*
+        }
+
         pub trait AstNode {
             fn children(&self) -> Vec<AstNodeRef>;
 
+            fn children_mut(&mut self) -> Vec<AstNodeRefMut>;
+
             fn as_node_ref(&self) -> AstNodeRef;
+
+            fn as_node_ref_mut(&mut self) -> AstNodeRefMut;
         }
 
         #(#impls)*

ast-generator/src/spec/struct_spec.rs

@@ -1,13 +1,19 @@
 pub struct StructSpec {
     build: String,
     children: Vec<Box<StructChild>>,
+    fields: Vec<Box<StructField>>,
 }
 
 impl StructSpec {
-    pub fn new(build: &str, children: Vec<Box<StructChild>>) -> Self {
+    pub fn new(
+        build: &str,
+        children: Vec<Box<StructChild>>,
+        fields: Vec<Box<StructField>>,
+    ) -> Self {
         Self {
             build: build.to_string(),
             children,
+            fields,
         }
     }
 
@@ -20,6 +26,10 @@ impl StructSpec {
     pub fn children(&self) -> impl Iterator<Item = &StructChild> {
         self.children.iter().map(Box::as_ref)
     }
+
+    pub fn fields(&self) -> impl Iterator<Item = &StructField> {
+        self.fields.iter().map(Box::as_ref)
+    }
 }
 
 pub enum StructChild {
@@ -39,10 +49,8 @@ impl StructChild {
 
     pub fn unwrap_special(&self) -> Option<&SpecialChild> {
         match self {
-            StructChild::Special(special_child) => {
-                Some(special_child)
-            },
-            _ => None
+            StructChild::Special(special_child) => Some(special_child),
+            _ => None,
         }
     }
 }
@@ -242,7 +250,7 @@ impl SpecialChild {
     pub fn new(name: &str, kind: SpecialChildKind) -> Self {
         Self {
             name: name.to_string(),
-            kind
+            kind,
         }
     }
 
@@ -260,3 +268,35 @@ pub enum SpecialChildKind {
     FileId,
     Range,
 }
+
+pub struct StructField {
+    name: String,
+    kind: StructFieldKind,
+    optional: bool,
+}
+
+impl StructField {
+    pub fn new(name: &str, kind: StructFieldKind, optional: bool) -> Self {
+        Self {
+            name: name.to_string(),
+            kind,
+            optional,
+        }
+    }
+    
+    pub fn name(&self) -> &str {
+        &self.name
+    }
+    
+    pub fn kind(&self) -> &StructFieldKind {
+        &self.kind
+    }
+    
+    pub fn optional(&self) -> bool {
+        self.optional
+    }
+}
+
+pub enum StructFieldKind {
+    USize,
+}

ast-generator/src/type_gen/struct_type.rs

@@ -1,6 +1,6 @@
 use crate::spec::struct_spec::{
-    MemberChild, MemberChildBuild, SpecialChild, SpecialChildKind, StructChild, StructSpec,
-    VecChild, VecChildBuild,
+    MemberChild, MemberChildBuild, SpecialChild, SpecialChildKind, StructChild, StructField,
+    StructFieldKind, StructSpec, VecChild, VecChildBuild,
 };
 use proc_macro2::{Ident, TokenStream};
 use quote::{format_ident, quote};
@@ -99,7 +99,7 @@ fn make_special_child_accessors(special_child: &SpecialChild) -> TokenStream {
     }
 }
 
-fn make_accessors(child: &StructChild) -> Option<TokenStream> {
+fn make_child_accessors(child: &StructChild) -> Option<TokenStream> {
     match child {
         StructChild::SkipChild(_) => None,
         StructChild::VecChild(vec_child) => Some(make_vec_child_accessors(vec_child)),
@@ -182,15 +182,68 @@ fn make_annotated_member(child: &StructChild) -> Option<TokenStream> {
     }
 }
 
+fn make_annotated_field(field: &StructField) -> TokenStream {
+    let field_ident = format_ident!("{}", field.name());
+    let field_type_ident = match field.kind() {
+        StructFieldKind::USize => quote! { usize },
+    };
+    if field.optional() {
+        quote! {
+            #field_ident: Option<#field_type_ident>
+        }
+    } else {
+        quote! {
+            #field_ident: #field_type_ident
+        }
+    }
+}
+
+fn make_field_init(field: &StructField) -> TokenStream {
+    let field_ident = format_ident!("{}", field.name());
+    if field.optional() {
+        quote! {
+            #field_ident: None
+        }
+    } else {
+        todo!()
+    }
+}
+
+fn make_field_accessors(field: &StructField) -> TokenStream {
+    let field_ident = format_ident!("{}", field.name());
+    let field_type_ident = match field.kind() {
+        StructFieldKind::USize => quote! { usize },
+    };
+    if field.optional() {
+        let setter_ident = format_ident!("set_{}", field.name());
+        quote! {
+            pub fn #field_ident(&self) -> Option<#field_type_ident> {
+                self.#field_ident
+            }
+
+            pub fn #setter_ident(&mut self, #field_ident: #field_type_ident) {
+                self.#field_ident = Some(#field_ident);
+            }
+        }
+    } else {
+        todo!()
+    }
+}
+
 pub fn make_struct_type(build_spec: &StructSpec) -> TokenStream {
     let type_ident = format_ident!("{}", build_spec.build());
-    let annotated_members = build_spec
+    let annotated_children = build_spec
         .children()
         .map(|child| make_annotated_member(child))
         .filter(Option::is_some)
         .map(Option::unwrap)
         .collect::<Vec<_>>();
 
+    let annotated_fields = build_spec
+        .fields()
+        .map(|field| make_annotated_field(field))
+        .collect::<Vec<_>>();
+
     let member_names = build_spec
         .children()
         .map(|child| make_member_ident(child))
@@ -198,26 +251,39 @@ pub fn make_struct_type(build_spec: &StructSpec) -> TokenStream {
         .map(Option::unwrap)
         .collect::<Vec<_>>();
 
-    let accessors = build_spec
+    let field_inits = build_spec
+        .fields()
+        .map(|field| make_field_init(field))
+        .collect::<Vec<_>>();
+
+    let child_accessors = build_spec
         .children()
-        .map(|child| make_accessors(child))
+        .map(|child| make_child_accessors(child))
         .filter(Option::is_some)
         .map(Option::unwrap)
         .collect::<Vec<_>>();
 
+    let field_accessors = build_spec
+        .fields()
+        .map(|field| make_field_accessors(field))
+        .collect::<Vec<_>>();
+
     quote! {
         pub struct #type_ident {
-            #(#annotated_members),*
+            #(#annotated_children,)*
+            #(#annotated_fields,)*
         }
 
         impl #type_ident {
-            pub fn new(#(#annotated_members),*) -> Self {
+            pub fn new(#(#annotated_children),*) -> Self {
                 Self {
-                    #(#member_names),*
+                    #(#member_names,)*
+                    #(#field_inits,)*
                 }
             }
 
-            #(#accessors)*
+            #(#child_accessors)*
+            #(#field_accessors)*
         }
     }
 }

src/ast/mod.rs

@@ -1,6 +1,36 @@
 pub mod node {
     include!(concat!(env!("OUT_DIR"), "/src/ast/node.rs"));
 
+    impl OperatorInner {
+        pub fn name(&self) -> &'static str {
+            match self {
+                OperatorInner::Or => "op_or",
+                OperatorInner::And => "op_and",
+                OperatorInner::EqualTo => "op_eq",
+                OperatorInner::NotEqualTo => "op_neq",
+                OperatorInner::Greater => "op_gt",
+                OperatorInner::Less => "op_lt",
+                OperatorInner::GreaterEqual => "op_ge",
+                OperatorInner::LessEqual => "op_le",
+                OperatorInner::Add => "op_add",
+                OperatorInner::Subtract => "op_sub",
+                OperatorInner::Multiply => "op_mul",
+                OperatorInner::Divide => "op_div",
+                OperatorInner::Modulo => "op_mod",
+                OperatorInner::LeftShift => "op_ls",
+                OperatorInner::RightShift => "op_rs",
+                OperatorInner::Spread => "op_spread",
+                OperatorInner::Star => "op_star",
+                OperatorInner::Not => "op_not",
+                OperatorInner::Negative => "op_neg",
+                OperatorInner::PlusPlus => "op_pp",
+                OperatorInner::MinusMinus => "op_mm",
+                OperatorInner::CallOp => "op_call",
+                OperatorInner::Index => "op_index",
+            }
+        }    
+    }
+    
     impl Default for Parameters {
         fn default() -> Self {
             Self::new(vec![])

src/name_analysis/gather.rs

@@ -1,10 +1,13 @@
 use crate::ast::ast_node::{AstNode, AstNodeRef};
 use crate::ast::node::{
-    Class, CompilationUnit, Function, FunctionBlockBody, FunctionBody, Identifier, Interface,
-    Module, Namespace, Statement, UseStatement, UseStatementSuffix, VariableDeclaration,
+    Class, CompilationUnit, Function, FunctionBody, Identifier, Interface,
+    InterfaceDefaultFunction, InterfaceDefaultOperatorFunction, InterfaceFunction,
+    InterfaceOperatorFunction, Member, Module, Namespace, OperatorFunction, PlatformFunction,
+    PlatformOperatorFunction, UseStatement, UseStatementSuffix, VariableDeclaration, VariableUse,
 };
 use crate::diagnostic::DmDiagnostic;
 use crate::name_analysis::fqn_context::FqnContext;
+use crate::name_analysis::symbol::class_member_symbol::ClassMemberSymbol;
 use crate::name_analysis::symbol::function_symbol::FunctionSymbol;
 use crate::name_analysis::symbol::module_symbol::ModuleSymbol;
 use crate::name_analysis::symbol::source_definition::SourceDefinition;
@@ -67,9 +70,14 @@ fn gather_node(
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
     match node {
-        AstNodeRef::Operator(_) => {}
+        AstNodeRef::Operator(_) => {
+            unreachable!();
+        }
+        AstNodeRef::OperatorInner(_) => {
+            unreachable!();
+        }
         AstNodeRef::Identifier(_) => {
-            unreachable!()
+            unreachable!();
         }
         AstNodeRef::FullyQualifiedName(_) => {}
         AstNodeRef::TypeUseList(_) => {}
@@ -98,13 +106,13 @@ fn gather_node(
             gather_use_statement(use_statement, symbol_table, diagnostics);
         }
         AstNodeRef::UseStatementPrefix(_) => {
-            unreachable!()
+            unreachable!();
         }
         AstNodeRef::UseStatementSuffix(_) => {
-            unreachable!()
+            unreachable!();
         }
         AstNodeRef::UseList(_) => {
-            unreachable!()
+            unreachable!();
         }
         AstNodeRef::ModuleLevelDeclaration(module_level_declaration) => {
             gather_node_children(
@@ -142,62 +150,76 @@ fn gather_node(
         AstNodeRef::Function(function) => {
             gather_function(function, symbol_table, fqn_context, diagnostics);
         }
-        AstNodeRef::OperatorFunction(_) => {}
-        AstNodeRef::PlatformFunction(_) => {}
-        AstNodeRef::InterfaceFunction(_) => {}
-        AstNodeRef::InterfaceDefaultFunction(_) => {}
-        AstNodeRef::InterfaceOperatorFunction(_) => {}
-        AstNodeRef::InterfaceDefaultOperatorFunction(_) => {}
-        AstNodeRef::FunctionBody(function_body) => match function_body {
-            FunctionBody::FunctionAliasBody(alias_body) => {
-                gather_node(
-                    alias_body.as_node_ref(),
-                    symbol_table,
-                    fqn_context,
-                    diagnostics,
-                );
-            }
-            FunctionBody::FunctionEqualsBody(equals_body) => {
-                gather_node(
-                    equals_body.as_node_ref(),
-                    symbol_table,
-                    fqn_context,
-                    diagnostics,
-                );
-            }
-            FunctionBody::FunctionBlockBody(block_body) => {
-                gather_node(
-                    block_body.as_node_ref(),
-                    symbol_table,
-                    fqn_context,
-                    diagnostics,
-                );
-            }
-        },
-        AstNodeRef::FunctionEqualsBody(_) => {}
-        AstNodeRef::FunctionAliasBody(_) => {}
-        AstNodeRef::FunctionBlockBody(block_body) => {
-            gather_function_block_body(block_body, symbol_table, fqn_context, diagnostics);
+        AstNodeRef::OperatorFunction(operator_function) => {
+            gather_operator_function(operator_function, symbol_table, fqn_context, diagnostics);
+        }
+        AstNodeRef::PlatformFunction(platform_function) => {
+            gather_platform_function(platform_function, symbol_table, fqn_context, diagnostics);
+        }
+        AstNodeRef::PlatformOperatorFunction(platform_operator_function) => {
+            gather_platform_operator_function(
+                platform_operator_function,
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+        }
+        AstNodeRef::InterfaceFunction(interface_function) => {
+            gather_interface_function(interface_function, symbol_table, fqn_context, diagnostics);
+        }
+        AstNodeRef::InterfaceDefaultFunction(interface_default_function) => {
+            gather_interface_default_function(
+                interface_default_function,
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+        }
+        AstNodeRef::InterfaceOperatorFunction(interface_operator_function) => {
+            gather_interface_operator_function(
+                interface_operator_function,
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+        }
+        AstNodeRef::InterfaceDefaultOperatorFunction(interface_default_operator_function) => {
+            gather_interface_default_operator_function(
+                interface_default_operator_function,
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+        }
+        AstNodeRef::FunctionBody(function_body) => {
+            gather_function_body(function_body, symbol_table, fqn_context, diagnostics);
+        }
+        AstNodeRef::FunctionEqualsBody(function_equals_body) => {
+            gather_node_children(function_equals_body, symbol_table, fqn_context, diagnostics);
+        }
+        AstNodeRef::FunctionAliasBody(_) => {
+            // no-op
+        }
+        AstNodeRef::FunctionBlockBody(function_block_body) => {
+            gather_node_children(function_block_body, symbol_table, fqn_context, diagnostics);
+        }
+        AstNodeRef::ClassConstructor(class_constructor) => {
+            gather_node_children(class_constructor, symbol_table, fqn_context, diagnostics);
+        }
+        AstNodeRef::Member(member) => {
+            gather_member(member, symbol_table, fqn_context, diagnostics);
+        }
+        AstNodeRef::Statement(statement) => {
+            gather_node_children(statement, symbol_table, fqn_context, diagnostics);
+        }
+        AstNodeRef::VariableDeclaration(variable_declaration) => {
+            gather_variable_declaration(
+                variable_declaration,
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
         }
-        AstNodeRef::ClassConstructor(_) => {}
-        AstNodeRef::Member(_) => {}
-        AstNodeRef::Statement(statement) => match statement {
-            Statement::VariableDeclaration(variable_declaration) => {
-                gather_node(
-                    variable_declaration.as_node_ref(),
-                    symbol_table,
-                    fqn_context,
-                    diagnostics,
-                );
-            }
-            Statement::AssignmentStatement(_) => {}
-            Statement::ExpressionStatement(_) => {}
-            Statement::UseStatement(_) => {}
-            Statement::IfStatement(_) => {}
-            Statement::WhileStatement(_) => {}
-            Statement::ForStatement(_) => {}
-        },
-        AstNodeRef::VariableDeclaration(_) => {}
         AstNodeRef::AssignmentStatement(_) => {}
         AstNodeRef::ExpressionStatement(_) => {}
         AstNodeRef::IfStatement(_) => {}
@@ -206,6 +228,11 @@ fn gather_node(
         AstNodeRef::IfElse(_) => {}
         AstNodeRef::WhileStatement(_) => {}
         AstNodeRef::ForStatement(_) => {}
+        AstNodeRef::LValue(_) => {}
+        AstNodeRef::LValueSuffix(_) => {}
+        AstNodeRef::VariableUse(variable_use) => {
+            gather_variable_use(variable_use, symbol_table, fqn_context, diagnostics);
+        }
         AstNodeRef::Expression(_) => {}
         AstNodeRef::TernaryExpression(_) => {}
         AstNodeRef::TernaryRhs(_) => {}
@@ -443,6 +470,12 @@ fn gather_class(
     fqn_context.push(class.identifier().name());
     symbol_table.push_scope(&format!("ClassScope {}", class.identifier().name()));
 
+    gather_node(
+        class.class_constructor().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
     for declaration in class.class_level_declarations() {
         gather_node(
             declaration.as_node_ref(),
@@ -479,25 +512,488 @@ fn gather_function(
             diagnostics,
         );
     }
+    symbol_table.push_scope(&format!("FunctionScope {}", function.identifier().name()));
+    gather_node(
+        function.generics().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        function.parameters().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        function.return_type().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
     gather_node(
         function.function_body().as_node_ref(),
         symbol_table,
         fqn_context,
         diagnostics,
     );
+    symbol_table.pop_scope();
 }
 
-fn gather_function_block_body(
-    function_block_body: &FunctionBlockBody,
+fn gather_operator_function(
+    operator_function: &OperatorFunction,
     symbol_table: &mut SymbolTable,
     fqn_context: &mut FqnContext,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    symbol_table.push_scope("FunctionBlockBody");
-    gather_node_children(function_block_body, symbol_table, fqn_context, diagnostics);
+    let function_symbol = FunctionSymbol::without_parameters_or_return_type(
+        &fqn_context.resolve(&operator_function.operator().inner().name()),
+        operator_function.operator().inner().name(),
+        operator_function.is_public(),
+        false,
+        Some(SourceDefinition::from_operator(
+            operator_function.operator(),
+        )),
+    );
+    if let Err(insert_error) = symbol_table.insert_function_symbol(function_symbol) {
+        handle_insert_error(
+            insert_error,
+            operator_function.operator().inner().name(),
+            operator_function.operator().file_id(),
+            operator_function.operator().range(),
+            "Operator",
+            diagnostics,
+        );
+    }
+    symbol_table.push_scope(&format!(
+        "FunctionScope {}",
+        operator_function.operator().inner().name()
+    ));
+    gather_node(
+        operator_function.generics().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        operator_function.parameters().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        operator_function.return_type().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        operator_function.function_body().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
     symbol_table.pop_scope();
 }
 
+fn gather_platform_function(
+    platform_function: &PlatformFunction,
+    symbol_table: &mut SymbolTable,
+    fqn_context: &mut FqnContext,
+    diagnostics: &mut Vec<DmDiagnostic>,
+) {
+    let function_symbol = FunctionSymbol::without_parameters_or_return_type(
+        &fqn_context.resolve(platform_function.identifier().name()),
+        platform_function.identifier().name(),
+        platform_function.is_public(),
+        true,
+        Some(SourceDefinition::from_identifier(
+            platform_function.identifier(),
+        )),
+    );
+    if let Err(insert_error) = symbol_table.insert_function_symbol(function_symbol) {
+        handle_insert_error(
+            insert_error,
+            platform_function.identifier().name(),
+            platform_function.identifier().file_id(),
+            platform_function.identifier().range(),
+            "Function",
+            diagnostics,
+        );
+    }
+    symbol_table.push_scope(&format!(
+        "PlatformFunctionScope {}",
+        platform_function.identifier().name()
+    ));
+    gather_node(
+        platform_function.generics().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        platform_function.parameters().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        platform_function.return_type().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    symbol_table.pop_scope();
+}
+
+fn gather_platform_operator_function(
+    platform_operator_function: &PlatformOperatorFunction,
+    symbol_table: &mut SymbolTable,
+    fqn_context: &mut FqnContext,
+    diagnostics: &mut Vec<DmDiagnostic>,
+) {
+    let function_symbol = FunctionSymbol::without_parameters_or_return_type(
+        &fqn_context.resolve(platform_operator_function.operator().inner().name()),
+        platform_operator_function.operator().inner().name(),
+        platform_operator_function.is_public(),
+        true,
+        Some(SourceDefinition::from_operator(
+            platform_operator_function.operator(),
+        )),
+    );
+    if let Err(insert_error) = symbol_table.insert_function_symbol(function_symbol) {
+        handle_insert_error(
+            insert_error,
+            platform_operator_function.operator().inner().name(),
+            platform_operator_function.operator().file_id(),
+            platform_operator_function.operator().range(),
+            "Function",
+            diagnostics,
+        );
+    }
+    symbol_table.push_scope(&format!(
+        "PlatformOperatorFunctionScope {}",
+        platform_operator_function.operator().inner().name()
+    ));
+    gather_node(
+        platform_operator_function.generics().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        platform_operator_function.parameters().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        platform_operator_function.return_type().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    symbol_table.pop_scope();
+}
+
+fn gather_interface_function(
+    interface_function: &InterfaceFunction,
+    symbol_table: &mut SymbolTable,
+    fqn_context: &mut FqnContext,
+    diagnostics: &mut Vec<DmDiagnostic>,
+) {
+    let function_symbol = FunctionSymbol::without_parameters_or_return_type(
+        &fqn_context.resolve(interface_function.identifier().name()),
+        interface_function.identifier().name(),
+        true,
+        false,
+        Some(SourceDefinition::from_identifier(
+            interface_function.identifier(),
+        )),
+    );
+    if let Err(insert_error) = symbol_table.insert_function_symbol(function_symbol) {
+        handle_insert_error(
+            insert_error,
+            interface_function.identifier().name(),
+            interface_function.identifier().file_id(),
+            interface_function.identifier().range(),
+            "Type",
+            diagnostics,
+        );
+    }
+    symbol_table.push_scope(&format!(
+        "InterfaceFunctionScope {}",
+        interface_function.identifier().name()
+    ));
+    gather_node(
+        interface_function.generics().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        interface_function.parameters().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        interface_function.return_type().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    symbol_table.pop_scope();
+}
+
+fn gather_interface_default_function(
+    interface_default_function: &InterfaceDefaultFunction,
+    symbol_table: &mut SymbolTable,
+    fqn_context: &mut FqnContext,
+    diagnostics: &mut Vec<DmDiagnostic>,
+) {
+    let function_symbol = FunctionSymbol::without_parameters_or_return_type(
+        &fqn_context.resolve(interface_default_function.identifier().name()),
+        interface_default_function.identifier().name(),
+        true,
+        false,
+        Some(SourceDefinition::from_identifier(
+            interface_default_function.identifier(),
+        )),
+    );
+    if let Err(insert_error) = symbol_table.insert_function_symbol(function_symbol) {
+        handle_insert_error(
+            insert_error,
+            interface_default_function.identifier().name(),
+            interface_default_function.identifier().file_id(),
+            interface_default_function.identifier().range(),
+            "Function",
+            diagnostics,
+        );
+    }
+    symbol_table.push_scope(&format!(
+        "InterfaceDefaultFunctionScope {}",
+        interface_default_function.identifier().name()
+    ));
+    gather_node(
+        interface_default_function.generics().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        interface_default_function.parameters().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        interface_default_function.return_type().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        interface_default_function.function_body().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    symbol_table.pop_scope();
+}
+
+fn gather_interface_operator_function(
+    interface_operator_function: &InterfaceOperatorFunction,
+    symbol_table: &mut SymbolTable,
+    fqn_context: &mut FqnContext,
+    diagnostics: &mut Vec<DmDiagnostic>,
+) {
+    let function_symbol = FunctionSymbol::without_parameters_or_return_type(
+        &fqn_context.resolve(interface_operator_function.operator().inner().name()),
+        interface_operator_function.operator().inner().name(),
+        true,
+        false,
+        Some(SourceDefinition::from_operator(
+            interface_operator_function.operator(),
+        )),
+    );
+    if let Err(insert_error) = symbol_table.insert_function_symbol(function_symbol) {
+        handle_insert_error(
+            insert_error,
+            interface_operator_function.operator().inner().name(),
+            interface_operator_function.operator().file_id(),
+            interface_operator_function.operator().range(),
+            "Function",
+            diagnostics,
+        );
+    }
+    symbol_table.push_scope(&format!(
+        "InterfaceOperatorFunctionScope {}",
+        interface_operator_function.operator().inner().name()
+    ));
+    gather_node(
+        interface_operator_function.generics().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        interface_operator_function.parameters().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        interface_operator_function.return_type().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    symbol_table.pop_scope();
+}
+
+fn gather_interface_default_operator_function(
+    interface_default_operator_function: &InterfaceDefaultOperatorFunction,
+    symbol_table: &mut SymbolTable,
+    fqn_context: &mut FqnContext,
+    diagnostics: &mut Vec<DmDiagnostic>,
+) {
+    let function_symbol = FunctionSymbol::without_parameters_or_return_type(
+        &fqn_context.resolve(
+            interface_default_operator_function
+                .operator()
+                .inner()
+                .name(),
+        ),
+        interface_default_operator_function
+            .operator()
+            .inner()
+            .name(),
+        true,
+        false,
+        Some(SourceDefinition::from_operator(
+            interface_default_operator_function.operator(),
+        )),
+    );
+    if let Err(insert_error) = symbol_table.insert_function_symbol(function_symbol) {
+        handle_insert_error(
+            insert_error,
+            interface_default_operator_function
+                .operator()
+                .inner()
+                .name(),
+            interface_default_operator_function.operator().file_id(),
+            interface_default_operator_function.operator().range(),
+            "Function",
+            diagnostics,
+        );
+    }
+    symbol_table.push_scope(&format!(
+        "InterfaceDefaultOperatorFunctionScope {}",
+        interface_default_operator_function
+            .operator()
+            .inner()
+            .name()
+    ));
+    gather_node(
+        interface_default_operator_function.generics().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        interface_default_operator_function
+            .parameters()
+            .as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        interface_default_operator_function
+            .return_type()
+            .as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    gather_node(
+        interface_default_operator_function
+            .function_body()
+            .as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    symbol_table.pop_scope();
+}
+
+fn gather_function_body(
+    function_body: &FunctionBody,
+    symbol_table: &mut SymbolTable,
+    fqn_context: &mut FqnContext,
+    diagnostics: &mut Vec<DmDiagnostic>,
+) {
+    symbol_table.push_scope("FunctionBodyScope");
+    match function_body {
+        FunctionBody::FunctionAliasBody(alias_body) => {
+            gather_node(
+                alias_body.as_node_ref(),
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+        }
+        FunctionBody::FunctionEqualsBody(equals_body) => {
+            gather_node(
+                equals_body.as_node_ref(),
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+        }
+        FunctionBody::FunctionBlockBody(block_body) => {
+            gather_node(
+                block_body.as_node_ref(),
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+        }
+    }
+    symbol_table.pop_scope();
+}
+
+fn gather_member(
+    member: &Member,
+    symbol_table: &mut SymbolTable,
+    fqn_context: &mut FqnContext,
+    diagnostics: &mut Vec<DmDiagnostic>,
+) {
+    let member_symbol = ClassMemberSymbol::new(
+        member.is_public(),
+        member.is_mut(),
+        member.identifier().name(),
+        Some(SourceDefinition::from_identifier(member.identifier())),
+    );
+    if let Err(insert_error) = symbol_table.insert_class_member_symbol(member_symbol) {
+        handle_insert_error(
+            insert_error,
+            member.identifier().name(),
+            member.identifier().file_id(),
+            member.identifier().range(),
+            "Class Member",
+            diagnostics,
+        );
+    }
+    gather_node(
+        member.type_use().as_node_ref(),
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+}
+
 fn gather_variable_declaration(
     variable_declaration: &VariableDeclaration,
     symbol_table: &mut SymbolTable,
@@ -530,3 +1026,12 @@ fn gather_variable_declaration(
         );
     }
 }
+
+fn gather_variable_use(
+    variable_use: &mut VariableUse,
+    symbol_table: &mut SymbolTable,
+    fqn_context: &mut FqnContext,
+    diagnostics: &mut Vec<DmDiagnostic>,
+) {
+    variable_use.set_scope_id(symbol_table.current_scope_id());
+}

src/name_analysis/symbol/class_member_symbol.rs

@@ -3,30 +3,37 @@ use std::fmt::{Debug, Formatter};
 
 #[derive(Clone)]
 pub struct ClassMemberSymbol {
+    is_public: bool,
+    is_mut: bool,
     declared_name: String,
-    is_field: bool,
     source_definition: Option<SourceDefinition>,
 }
 
 impl ClassMemberSymbol {
     pub fn new(
+        is_public: bool,
+        is_mut: bool,
         declared_name: &str,
-        is_field: bool,
         source_definition: Option<SourceDefinition>,
     ) -> Self {
         Self {
+            is_public,
+            is_mut,
             declared_name: declared_name.to_string(),
-            is_field,
             source_definition,
         }
     }
     
-    pub fn declared_name(&self) -> &str {
-        &self.declared_name
+    pub fn is_public(&self) -> bool {
+        self.is_public
     }
     
-    pub fn is_field(&self) -> bool {
-        self.is_field
+    pub fn is_mut(&self) -> bool {
+        self.is_mut
+    }
+
+    pub fn declared_name(&self) -> &str {
+        &self.declared_name
     }
 
     pub fn source_definition(&self) -> Option<&SourceDefinition> {
@@ -37,8 +44,9 @@ impl ClassMemberSymbol {
 impl Debug for ClassMemberSymbol {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
         f.debug_struct("ClassMemberSymbol")
+            .field("is_public", &self.is_public)
+            .field("is_mut", &self.is_mut)
             .field("declared_name", &self.declared_name)
-            .field("is_field", &self.is_field)
             .field("source_definition", &self.source_definition)
             .finish()
     }

src/name_analysis/symbol/source_definition.rs

@@ -1,7 +1,7 @@
 use std::cell::RefCell;
 use std::range::Range;
 use std::rc::Rc;
-use crate::ast::node::{Identifier, UseStatement};
+use crate::ast::node::{Identifier, Operator, UseStatement};
 
 #[derive(Clone, Debug)]
 pub struct SourceDefinition {
@@ -17,14 +17,6 @@ impl SourceDefinition {
         }
     }
     
-    pub fn from_identifier_rc(identifier: Rc<RefCell<Identifier>>) -> Self {
-        let borrowed = identifier.borrow();
-        SourceDefinition {
-            file_id: borrowed.file_id(),
-            range: borrowed.range(),
-        }
-    }
-    
     pub fn from_use_statement(use_statement: &UseStatement) -> Self {
         Self {
             file_id: use_statement.file_id(),
@@ -32,6 +24,13 @@ impl SourceDefinition {
         }
     }
     
+    pub fn from_operator(operator: &Operator) -> Self {
+        Self {
+            file_id: operator.file_id(),
+            range: operator.range(),
+        }
+    }
+
     pub fn file_id(&self) -> usize {
         self.file_id
     }

src/name_analysis/symbol_table/mod.rs

@@ -57,11 +57,11 @@ impl SymbolTable {
     }
 
     fn current_scope(&self) -> &Scope {
-        self.scopes.last().unwrap()
+        &self.scopes[self.current_scope_id]
     }
 
     fn current_scope_mut(&mut self) -> &mut Scope {
-        self.scopes.last_mut().unwrap()
+        &mut self.scopes[self.current_scope_id]
     }
 
     fn find_current_scope_concrete_use_symbol(

src/name_analysis/symbol_table/scope.rs

@@ -127,7 +127,13 @@ macro_rules! write_symbols {
 
 impl Display for Scope {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        writeln!(f, "----Scope {} {}----", self.id(), self.debug_name())?;
+        writeln!(
+            f,
+            "----Scope {} (p: {}) {}----",
+            self.id(),
+            self.parent().map(|parent_id| format!("{}", parent_id)).unwrap_or_else(|| "None".to_string()),
+            self.debug_name()
+        )?;
         write_symbols!(f, self.concrete_use_symbols());
         write_symbols!(f, self.star_use_symbols());
         write_symbols!(f, self.module_symbols());

src/parser/ast.yaml

@@ -1,6 +1,18 @@
 # $schema: ./ast.schema.yaml
 # Operators
 Operator:
+  struct:
+    children:
+      - inner:
+          member:
+            rule: OperatorInner
+      - file_id:
+          special:
+            kind: file_id
+      - range:
+          special:
+            kind: range
+OperatorInner:
   leaf_enum:
     rules:
       - Or
@@ -429,6 +441,30 @@ PlatformFunction:
       - identifier
       - parameters
       - return_type
+PlatformOperatorFunction:
+  struct:
+    children:
+      - is_public:
+          member:
+            rule: Pub
+            build:
+              boolean:
+                on: rule_present
+      - platform_kw:
+          skip:
+            rule: Platform
+      - op_kw:
+          skip:
+            rule: Op
+      - generics:
+          member:
+            rule: GenericParameters
+            build:
+              node:
+                or_else_default: true
+      - operator
+      - parameters
+      - return_type
 InterfaceFunction:
   struct:
     children:
@@ -592,12 +628,8 @@ VariableDeclaration:
 AssignmentStatement:
   struct:
     children:
-      - left:
-          member:
-            rule: Expression
-      - right:
-          member:
-            rule: Expression
+      - l_value
+      - expression
 ExpressionStatement:
   struct:
     children:
@@ -679,6 +711,30 @@ ForStatement:
           skip:
             rule: End
 
+# LValue
+LValue:
+  struct:
+    children:
+      - variable_use
+      - suffixes:
+          vec:
+            rule: LValueSuffix
+LValueSuffix:
+  tree_enum:
+    rules:
+      - ObjectProperty
+      - ObjectIndex
+
+# VariableUse
+VariableUse:
+  struct:
+    children:
+      - identifier
+    fields:
+      - scope_id:
+          kind: usize
+          optional: true
+
 # Expressions
 Expression:
   polymorphic_type:
@@ -713,6 +769,9 @@ Expression:
       - Literal:
           inner:
             kind: Literal
+      - VariableUse:
+          inner:
+            kind: VariableUse
       - Fqn:
           inner:
             kind: FullyQualifiedName
@@ -1055,6 +1114,9 @@ PrimaryExpression:
       - Literal:
           inner:
             kind: Literal
+      - VariableUse:
+          inner:
+            kind: VariableUse
       - Fqn:
           inner:
             kind: FullyQualifiedName

src/parser/deimos.pest

@@ -131,6 +131,10 @@ Index = { "[]" }
 BorrowMut = { Borrow ~ Mut }
 
 Operator = {
+      OperatorInner
+}
+
+OperatorInner = {
       Or
     | And
     | EqualTo
@@ -431,6 +435,16 @@ PlatformFunction = {
     ~ ReturnType
 }
 
+PlatformOperatorFunction = {
+      Pub?
+    ~ Platform
+    ~ Op
+    ~ GenericParameters?
+    ~ Operator
+    ~ Parameters
+    ~ ReturnType
+}
+
 InterfaceFunction = {
       Fn
     ~ GenericParameters?
@@ -528,7 +542,7 @@ VariableDeclaration = {
 }
 
 AssignmentStatement = {
-      Expression
+      LValue
     ~ "="
     ~ Expression
 }
@@ -579,6 +593,24 @@ ForStatement = {
     ~ End
 }
 
+// LValue
+
+LValue = {
+      VariableUse
+    ~ LValueSuffix*
+}
+
+LValueSuffix = {
+      ObjectProperty
+    | ObjectIndex
+}
+
+// Variable Use
+
+VariableUse = {
+      Identifier
+}
+
 // Expressions
 
 Expression = {
@@ -727,6 +759,7 @@ ObjectIndex = {
 
 PrimaryExpression = {
       Literal
+    | VariableUse
     | FullyQualifiedName
     | Closure
     | ListExpression