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Start adding infrastructure for defining new types

This commit is contained in:
Greg Shuflin 2021-10-29 04:01:38 -07:00
parent cec0f35fc3
commit 209b6bba48
7 changed files with 287 additions and 344 deletions
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367
schala-lang/language/src/symbol_table/mod.rs
View File

@ -1,20 +1,24 @@
use std::collections::{hash_map::Entry, HashMap, HashSet};
use std::fmt;
use std::rc::Rc;
use crate::ast;
use crate::ast::{
Declaration, ItemId, ModuleSpecifier, Statement, StatementKind, TypeBody, TypeSingletonName,
Variant, VariantKind,
use std::{
collections::{hash_map::Entry, HashMap, HashSet},
fmt,
rc::Rc,
};
use crate::{
ast,
ast::{
Declaration, ItemId, ModuleSpecifier, Statement, StatementKind, TypeBody, TypeSingletonName, Variant,
VariantKind,
},
tokenizing::Location,
type_inference::{PendingType, TypeBuilder, TypeContext, TypeId, VariantBuilder},
};
use crate::tokenizing::Location;
use crate::type_inference::{TypeContext, TypeId};
mod resolver;
mod symbol_trie;
use symbol_trie::SymbolTrie;
mod test;
use crate::identifier::{Id, IdStore, define_id_kind};
use crate::identifier::{define_id_kind, Id, IdStore};
define_id_kind!(DefItem);
pub type DefId = Id<DefItem>;
@ -63,7 +67,6 @@ impl fmt::Display for Fqsn {
}
}
//TODO eventually this should use ItemId's to avoid String-cloning
/// One segment within a scope.
#[derive(Debug, Clone, Eq, PartialEq, Hash, PartialOrd, Ord)]
@ -81,19 +84,9 @@ impl fmt::Display for Scope {
#[allow(dead_code)]
#[derive(Debug, Clone)]
pub enum SymbolError {
DuplicateName {
prev_name: Fqsn,
location: Location,
},
DuplicateVariant {
type_fqsn: Fqsn,
name: String,
},
DuplicateRecord {
type_name: Fqsn,
location: Location,
member: String,
},
DuplicateName { prev_name: Fqsn, location: Location },
DuplicateVariant { type_fqsn: Fqsn, name: String },
DuplicateRecord { type_name: Fqsn, location: Location, member: String },
}
#[allow(dead_code)]
@ -120,17 +113,13 @@ struct NameTable<K> {
impl<K> NameTable<K> {
fn new() -> Self {
Self {
table: HashMap::new(),
}
Self { table: HashMap::new() }
}
fn register(&mut self, name: Fqsn, spec: NameSpec<K>) -> Result<(), SymbolError> {
match self.table.entry(name.clone()) {
Entry::Occupied(o) => Err(SymbolError::DuplicateName {
prev_name: name,
location: o.get().location,
}),
Entry::Occupied(o) =>
Err(SymbolError::DuplicateName { prev_name: name, location: o.get().location }),
Entry::Vacant(v) => {
v.insert(spec);
Ok(())
@ -141,7 +130,6 @@ impl<K> NameTable<K> {
//cf. p. 150 or so of Language Implementation Patterns
pub struct SymbolTable {
def_id_store: IdStore<DefItem>,
/// Used for import resolution.
@ -175,8 +163,11 @@ impl SymbolTable {
/// The main entry point into the symbol table. This will traverse the AST in several
/// different ways and populate subtables with information that will be used further in the
/// compilation process.
pub fn process_ast(&mut self, ast: &ast::AST, type_context: &mut TypeContext) -> Result<(), Vec<SymbolError>> {
pub fn process_ast(
&mut self,
ast: &ast::AST,
type_context: &mut TypeContext,
) -> Result<(), Vec<SymbolError>> {
let mut runner = SymbolTableRunner { type_context, table: self };
let errs = runner.populate_name_tables(ast);
@ -193,8 +184,7 @@ impl SymbolTable {
//TODO optimize this
pub fn lookup_symbol_by_def(&self, def: &DefId) -> Option<&Symbol> {
self.id_to_symbol.iter().find(|(_, sym)| sym.def_id == *def)
.map(|(_, sym)| sym.as_ref())
self.id_to_symbol.iter().find(|(_, sym)| sym.def_id == *def).map(|(_, sym)| sym.as_ref())
}
#[allow(dead_code)]
@ -210,11 +200,7 @@ impl SymbolTable {
/// to a Symbol, a descriptor of what that name refers to.
fn add_symbol(&mut self, id: &ItemId, fqsn: Fqsn, spec: SymbolSpec) {
let def_id = self.def_id_store.fresh();
let symbol = Rc::new(Symbol {
fully_qualified_name: fqsn.clone(),
spec,
def_id,
});
let symbol = Rc::new(Symbol { fully_qualified_name: fqsn.clone(), spec, def_id });
self.symbol_trie.insert(&fqsn);
self.fqsn_to_symbol.insert(fqsn, symbol.clone());
self.id_to_symbol.insert(*id, symbol);
@ -223,7 +209,7 @@ impl SymbolTable {
struct SymbolTableRunner<'a> {
type_context: &'a mut TypeContext,
table: &'a mut SymbolTable
table: &'a mut SymbolTable,
}
#[allow(dead_code)]
@ -269,16 +255,10 @@ impl fmt::Display for Symbol {
#[derive(Debug, Clone)]
pub enum SymbolSpec {
Func,
DataConstructor {
tag: u32,
arity: usize,
type_id: TypeId,
},
RecordConstructor {
tag: u32,
members: HashMap<Rc<String>, TypeId>,
type_id: TypeId,
},
// The tag and arity here are *surface* tags, computed from the order in which they were
// defined. The type context may create a different ordering.
DataConstructor { tag: u32, arity: usize, type_id: TypeId },
RecordConstructor { tag: u32, members: HashMap<Rc<String>, TypeId>, type_id: TypeId },
GlobalBinding, //Only for global variables, not for function-local ones or ones within a `let` scope context
LocalVariable,
FunctionParam(u8),
@ -289,22 +269,10 @@ impl fmt::Display for SymbolSpec {
use self::SymbolSpec::*;
match self {
Func => write!(f, "Func"),
DataConstructor {
tag,
type_id,
arity,
} => write!(
f,
"DataConstructor(tag: {}, arity: {}, type: {})",
tag, arity, type_id
),
RecordConstructor {
type_id, tag, ..
} => write!(
f,
"RecordConstructor(tag: {})(<members> -> {})",
tag, type_id
),
DataConstructor { tag, type_id, arity } =>
write!(f, "DataConstructor(tag: {}, arity: {}, type: {})", tag, arity, type_id),
RecordConstructor { type_id, tag, .. } =>
write!(f, "RecordConstructor(tag: {})(<members> -> {})", tag, type_id),
GlobalBinding => write!(f, "GlobalBinding"),
LocalVariable => write!(f, "Local variable"),
FunctionParam(n) => write!(f, "Function param: {}", n),
@ -345,11 +313,7 @@ impl<'a> SymbolTableRunner<'a> {
let mut errors = vec![];
for statement in statements {
let Statement {
id,
kind,
location,
} = statement; //TODO I'm not sure if I need to do anything with this ID
let Statement { id, kind, location } = statement; //TODO I'm not sure if I need to do anything with this ID
let location = *location;
if let Err(err) = self.add_single_statement(id, kind, location, scope_stack, function_scope) {
errors.push(err);
@ -370,11 +334,8 @@ impl<'a> SymbolTableRunner<'a> {
scope_stack.pop();
output
}
StatementKind::Declaration(Declaration::TypeDecl {
name,
body,
mutable,
}) => self.add_type_members(name, body, mutable, location, scope_stack),
StatementKind::Declaration(Declaration::TypeDecl { name, body, mutable }) =>
self.add_type_members(name, body, mutable, location, scope_stack),
_ => vec![],
};
errors.extend(recursive_errs.into_iter());
@ -395,87 +356,39 @@ impl<'a> SymbolTableRunner<'a> {
match kind {
StatementKind::Declaration(Declaration::FuncSig(signature)) => {
let fq_function = Fqsn::from_scope_stack(scope_stack, signature.name.clone());
self.table.fq_names.register(
fq_function.clone(),
NameSpec {
location,
kind: NameKind::Function,
},
)?;
self.table.types.register(
fq_function.clone(),
NameSpec {
location,
kind: TypeKind,
},
)?;
self.table
.fq_names
.register(fq_function.clone(), NameSpec { location, kind: NameKind::Function })?;
self.table.types.register(fq_function.clone(), NameSpec { location, kind: TypeKind })?;
self.add_symbol(
id,
fq_function,
SymbolSpec::Func,
);
self.add_symbol(id, fq_function, SymbolSpec::Func);
}
StatementKind::Declaration(Declaration::FuncDecl(signature, ..)) => {
let fn_name = &signature.name;
let fq_function = Fqsn::from_scope_stack(scope_stack, fn_name.clone());
self.table.fq_names.register(
fq_function.clone(),
NameSpec {
location,
kind: NameKind::Function,
},
)?;
self.table.types.register(
fq_function.clone(),
NameSpec {
location,
kind: TypeKind,
},
)?;
self.table
.fq_names
.register(fq_function.clone(), NameSpec { location, kind: NameKind::Function })?;
self.table.types.register(fq_function.clone(), NameSpec { location, kind: TypeKind })?;
self.add_symbol(
id,
fq_function,
SymbolSpec::Func,
);
self.add_symbol(id, fq_function, SymbolSpec::Func);
}
StatementKind::Declaration(Declaration::TypeDecl { name, .. }) => {
let fq_type = Fqsn::from_scope_stack(scope_stack, name.name.clone());
self.table.types.register(
fq_type,
NameSpec {
location,
kind: TypeKind,
},
)?;
self.table.types.register(fq_type, NameSpec { location, kind: TypeKind })?;
}
StatementKind::Declaration(Declaration::Binding { name, .. }) => {
let fq_binding = Fqsn::from_scope_stack(scope_stack, name.clone());
self.table.fq_names.register(
fq_binding.clone(),
NameSpec {
location,
kind: NameKind::Binding,
},
)?;
self.table
.fq_names
.register(fq_binding.clone(), NameSpec { location, kind: NameKind::Binding })?;
if !function_scope {
self.add_symbol(
id,
fq_binding,
SymbolSpec::GlobalBinding,
);
self.add_symbol(id, fq_binding, SymbolSpec::GlobalBinding);
}
}
StatementKind::Module(ModuleSpecifier { name, .. }) => {
let fq_module = Fqsn::from_scope_stack(scope_stack, name.clone());
self.table.fq_names.register(
fq_module,
NameSpec {
location,
kind: NameKind::Module,
},
)?;
self.table.fq_names.register(fq_module, NameSpec { location, kind: NameKind::Module })?;
}
_ => (),
}
@ -490,113 +403,93 @@ impl<'a> SymbolTableRunner<'a> {
location: Location,
scope_stack: &mut Vec<Scope>,
) -> Vec<SymbolError> {
let type_fqsn = Fqsn::from_scope_stack(scope_stack, type_name.name.clone());
let TypeBody(variants) = type_body;
let mut duplicates = HashSet::new();
let mut dup_errors = vec![];
for variant in variants {
if duplicates.contains(&variant.name) {
dup_errors.push(SymbolError::DuplicateVariant {
type_fqsn: type_fqsn.clone(),
name: variant.name.as_ref().to_string()
})
}
duplicates.insert(variant.name.clone());
}
if !dup_errors.is_empty() {
return dup_errors;
}
let mut member_errors = vec![];
let mut errors = vec![];
let mut register = |id: &ItemId, fqsn: Fqsn, spec: SymbolSpec| {
let name_spec = NameSpec {
location,
kind: TypeKind,
};
if let Err(err) = self.table.types.register(fqsn.clone(), name_spec) {
errors.push(err);
} else {
self.table.add_symbol(id, fqsn, spec);
};
};
let type_fqsn = Fqsn::from_scope_stack(scope_stack, type_name.name.clone());
let new_scope = Scope::Name(type_name.name.clone());
scope_stack.push(new_scope);
for (index, variant) in variants.iter().enumerate() {
let tag = index as u32;
let Variant { name, kind, id } = variant;
let type_id = self.type_context.id_from_name(name.as_ref());
// Check for duplicates before registering any types with the TypeContext
let mut seen_variants = HashSet::new();
let mut errors = vec![];
match kind {
VariantKind::UnitStruct => {
let fq_name = Fqsn::from_scope_stack(scope_stack.as_ref(), name.clone());
let spec = SymbolSpec::DataConstructor {
tag,
arity: 0,
type_id,
};
register(id, fq_name, spec);
}
VariantKind::TupleStruct(items) => {
let fq_name = Fqsn::from_scope_stack(scope_stack.as_ref(), name.clone());
let spec = SymbolSpec::DataConstructor {
tag,
arity: items.len(),
type_id,
};
register(id, fq_name, spec);
}
VariantKind::Record(members) => {
let fq_name = Fqsn::from_scope_stack(scope_stack.as_ref(), name.clone());
for variant in variants {
if seen_variants.contains(&variant.name) {
errors.push(SymbolError::DuplicateVariant {
type_fqsn: type_fqsn.clone(),
name: variant.name.as_ref().to_string(),
})
}
seen_variants.insert(variant.name.clone());
let mut seen_members = HashMap::new();
for (member_name, _) in members.iter() {
match seen_members.entry(member_name.as_ref()) {
Entry::Occupied(o) => {
let location = *o.get();
member_errors.push(SymbolError::DuplicateRecord {
type_name: fq_name.clone(),
location,
member: member_name.as_ref().to_string(),
});
}
//TODO eventually this should track meaningful locations
Entry::Vacant(v) => {
v.insert(Location::default());
}
if let VariantKind::Record(ref members) = variant.kind {
let variant_name = Fqsn::from_scope_stack(scope_stack.as_ref(), variant.name.clone());
let mut seen_members = HashMap::new();
for (member_name, _) in members.iter() {
match seen_members.entry(member_name.as_ref()) {
Entry::Occupied(o) => {
let location = *o.get();
errors.push(SymbolError::DuplicateRecord {
type_name: variant_name.clone(),
location,
member: member_name.as_ref().to_string(),
});
}
//TODO eventually this should track meaningful locations
Entry::Vacant(v) => {
v.insert(location);
}
}
let spec = SymbolSpec::RecordConstructor {
tag,
type_id,
members: members
.iter()
.map(|(member_name, _type_identifier)| {
(
member_name.clone(),
self.type_context.id_from_name("DUMMY_TYPE_ID")
)
})
.collect(),
};
register(id, fq_name, spec);
}
}
}
if !errors.is_empty() {
return errors;
}
let mut type_builder = TypeBuilder::new(type_name.name.as_ref());
for variant in variants.iter() {
let Variant { name, kind, id: _ } = variant;
//TODO the order in which things get added to variant_builder determines the sematnics
//of `tag` later
let mut variant_builder = VariantBuilder::new(name.as_ref());
match kind {
VariantKind::UnitStruct => (),
VariantKind::TupleStruct(items) =>
for type_identifier in items {
let pending: PendingType = type_identifier.into();
variant_builder.add_member(pending);
},
VariantKind::Record(members) =>
for (field_name, type_identifier) in members.iter() {
let pending: PendingType = type_identifier.into();
variant_builder.add_record_member(field_name.as_ref(), pending);
},
}
type_builder.add_variant(variant_builder);
}
let type_id = self.type_context.register_type(type_builder);
for (index, variant) in variants.iter().enumerate() {
let Variant { name, kind, id } = variant;
let fqsn = Fqsn::from_scope_stack(scope_stack.as_ref(), name.clone());
let spec = match kind {
VariantKind::UnitStruct =>
SymbolSpec::DataConstructor { tag: index as u32, arity: 0, type_id },
VariantKind::TupleStruct(items) =>
SymbolSpec::DataConstructor { tag: index as u32, arity: items.len(), type_id },
VariantKind::Record(..) =>
SymbolSpec::RecordConstructor { tag: index as u32, members: HashMap::new(), type_id },
};
println!("Adding symbol {}", fqsn);
self.table.add_symbol(id, fqsn, spec);
}
scope_stack.pop();
errors.extend(member_errors.into_iter());
errors
vec![]
}
}

99
schala-lang/language/src/symbol_table/resolver.rs
View File

@ -1,8 +1,10 @@
use std::rc::Rc;
use crate::ast::*;
use crate::symbol_table::{Fqsn, Scope, SymbolTable, SymbolSpec};
use crate::util::ScopeStack;
use crate::{
ast::*,
symbol_table::{Fqsn, Scope, SymbolSpec, SymbolTable},
util::ScopeStack,
};
#[derive(Debug)]
enum NameType {
@ -14,9 +16,7 @@ enum NameType {
#[derive(Debug)]
enum ScopeType {
Function {
name: Rc<String>
},
Function { name: Rc<String> },
Lambda,
PatternMatch,
//TODO add some notion of a let-like scope?
@ -32,17 +32,13 @@ pub struct ScopeResolver<'a> {
impl<'a> ScopeResolver<'a> {
pub fn new(symbol_table: &'a mut SymbolTable) -> Self {
let lexical_scopes = ScopeStack::new(None);
Self {
symbol_table,
lexical_scopes,
}
Self { symbol_table, lexical_scopes }
}
pub fn resolve(&mut self, ast: &AST) {
walk_ast(self, ast);
}
/*
fn lookup_name_in_scope(&self, sym_name: &QualifiedName) -> Fqsn {
let QualifiedName { components, .. } = sym_name;
@ -85,7 +81,7 @@ impl<'a> ScopeResolver<'a> {
if let Some(symbol) = symbol {
self.symbol_table.id_to_symbol.insert(*id, symbol.clone());
}
},
}
Some(NameType::Param(n)) => {
let spec = SymbolSpec::FunctionParam(*n);
//TODO need to come up with a better solution for local variable FQSNs
@ -98,7 +94,7 @@ impl<'a> ScopeResolver<'a> {
if let Some(symbol) = symbol {
self.symbol_table.id_to_symbol.insert(*id, symbol);
}
},
}
None => {
//TODO see if I can reduce this duplicate code
let fqsn = Fqsn { scopes: vec![Scope::Name(local_name.clone())] };
@ -123,38 +119,23 @@ impl<'a> ASTVisitor for ScopeResolver<'a> {
// FQSNs map to a Symbol (or this is an error), Symbols have a DefId. So for every
// name we import, we map a local name (a string) to a NameType::ImportedDefinition(DefId).
fn import(&mut self, import_spec: &ImportSpecifier) -> Recursion {
let ImportSpecifier {
ref path_components,
ref imported_names,
..
} = &import_spec;
let ImportSpecifier { ref path_components, ref imported_names, .. } = &import_spec;
match imported_names {
ImportedNames::All => {
let prefix = Fqsn {
scopes: path_components
.iter()
.map(|c| Scope::Name(c.clone()))
.collect(),
};
let prefix =
Fqsn { scopes: path_components.iter().map(|c| Scope::Name(c.clone())).collect() };
let members = self.symbol_table.symbol_trie.get_children(&prefix);
for fqsn in members.into_iter() {
self.lexical_scopes.insert( fqsn.local_name(), NameType::Import(fqsn));
self.lexical_scopes.insert(fqsn.local_name(), NameType::Import(fqsn));
}
}
ImportedNames::LastOfPath => {
let fqsn = Fqsn {
scopes: path_components
.iter()
.map(|c| Scope::Name(c.clone()))
.collect()
};
let fqsn = Fqsn { scopes: path_components.iter().map(|c| Scope::Name(c.clone())).collect() };
self.lexical_scopes.insert(fqsn.local_name(), NameType::Import(fqsn));
}
ImportedNames::List(ref names) => {
let fqsn_prefix: Vec<Scope> = path_components
.iter()
.map(|c| Scope::Name(c.clone()))
.collect();
let fqsn_prefix: Vec<Scope> =
path_components.iter().map(|c| Scope::Name(c.clone())).collect();
for name in names.iter() {
let mut scopes = fqsn_prefix.clone();
scopes.push(Scope::Name(name.clone()));
@ -170,23 +151,22 @@ impl<'a> ASTVisitor for ScopeResolver<'a> {
let cur_function_name = match self.lexical_scopes.get_name() {
//TODO this needs to be a fqsn
Some(ScopeType::Function { name }) => Some(name.clone()),
_ => None
_ => None,
};
match declaration {
Declaration::FuncDecl(signature, block) => {
let param_names = signature.params.iter().map(|param| param.name.clone());
//TODO I'm 90% sure this is right, until I get to closures
//let mut new_scope = self.lexical_scopes.new_scope(Some(ScopeType::Function { name: signature.name.clone() }));
let mut new_scope = ScopeStack::new(Some(ScopeType::Function { name: signature.name.clone() }));
let mut new_scope =
ScopeStack::new(Some(ScopeType::Function { name: signature.name.clone() }));
for (n, param) in param_names.enumerate().into_iter() {
new_scope.insert(param, NameType::Param(n as u8));
}
let mut new_resolver = ScopeResolver {
symbol_table: self.symbol_table,
lexical_scopes: new_scope,
};
let mut new_resolver =
ScopeResolver { symbol_table: self.symbol_table, lexical_scopes: new_scope };
walk_block(&mut new_resolver, block);
Recursion::Stop
}
@ -199,7 +179,7 @@ impl<'a> ASTVisitor for ScopeResolver<'a> {
}
Recursion::Continue
}
_ => Recursion::Continue
_ => Recursion::Continue,
}
}
@ -208,10 +188,10 @@ impl<'a> ASTVisitor for ScopeResolver<'a> {
match &expression.kind {
Value(name) => {
self.lookup_name_in_scope(name);
},
}
NamedStruct { name, fields: _ } => {
self.lookup_name_in_scope(name);
},
}
Lambda { params, body, .. } => {
let param_names = params.iter().map(|param| param.name.clone());
//TODO need to properly handle closure scope, this is currently broken
@ -222,10 +202,8 @@ impl<'a> ASTVisitor for ScopeResolver<'a> {
new_scope.insert(param, NameType::Param(n as u8));
}
let mut new_resolver = ScopeResolver {
symbol_table: self.symbol_table,
lexical_scopes: new_scope,
};
let mut new_resolver =
ScopeResolver { symbol_table: self.symbol_table, lexical_scopes: new_scope };
walk_block(&mut new_resolver, body);
return Recursion::Stop;
}
@ -235,32 +213,25 @@ impl<'a> ASTVisitor for ScopeResolver<'a> {
}
let mut resolver = ScopeResolver {
lexical_scopes: self.lexical_scopes.new_scope(Some(ScopeType::PatternMatch)),
symbol_table: self.symbol_table
symbol_table: self.symbol_table,
};
let new_resolver = &mut resolver;
match body.as_ref() {
IfExpressionBody::SimpleConditional {
then_case,
else_case,
} => {
IfExpressionBody::SimpleConditional { then_case, else_case } => {
walk_block(new_resolver, then_case);
if let Some(block) = else_case.as_ref() {
walk_block(new_resolver, block)
}
}
IfExpressionBody::SimplePatternMatch {
pattern,
then_case,
else_case,
} => {
IfExpressionBody::SimplePatternMatch { pattern, then_case, else_case } => {
walk_pattern(new_resolver, pattern);
walk_block(new_resolver, then_case);
if let Some(block) = else_case.as_ref() {
walk_block(new_resolver, block)
}
}
IfExpressionBody::CondList(arms) => {
IfExpressionBody::CondList(arms) =>
for arm in arms {
match arm.condition {
Condition::Pattern(ref pat) => {
@ -278,12 +249,11 @@ impl<'a> ASTVisitor for ScopeResolver<'a> {
walk_expression(new_resolver, guard);
}
walk_block(new_resolver, &arm.body);
}
}
},
};
return Recursion::Stop;
},
}
_ => (),
}
Recursion::Continue
@ -308,13 +278,14 @@ impl<'a> ASTVisitor for ScopeResolver<'a> {
self.symbol_table.add_symbol(id, fqsn, SymbolSpec::LocalVariable);
self.lexical_scopes.insert(local_name, NameType::LocalVariable(*id));
} else {
let fqsn = Fqsn { scopes: components.iter().map(|name| Scope::Name(name.clone())).collect() };
let fqsn =
Fqsn { scopes: components.iter().map(|name| Scope::Name(name.clone())).collect() };
let symbol = self.symbol_table.fqsn_to_symbol.get(&fqsn);
if let Some(symbol) = symbol {
self.symbol_table.id_to_symbol.insert(*id, symbol.clone());
}
}
},
}
};
Recursion::Continue
}

16
schala-lang/language/src/symbol_table/symbol_trie.rs
View File

@ -1,7 +1,11 @@
use super::{Fqsn, Scope};
use std::{
collections::hash_map::DefaultHasher,
hash::{Hash, Hasher},
};
use radix_trie::{Trie, TrieCommon, TrieKey};
use std::collections::hash_map::DefaultHasher;
use std::hash::{Hash, Hasher};
use super::{Fqsn, Scope};
#[derive(Debug)]
pub struct SymbolTrie(Trie<Fqsn, ()>);
@ -33,11 +37,7 @@ impl SymbolTrie {
Some(s) => s,
None => return vec![],
};
let output: Vec<Fqsn> = subtrie
.keys()
.filter(|cur_key| **cur_key != *fqsn)
.cloned()
.collect();
let output: Vec<Fqsn> = subtrie.keys().filter(|cur_key| **cur_key != *fqsn).cloned().collect();
output
}
}

2
schala-lang/language/src/symbol_table/test.rs
View File

@ -31,8 +31,6 @@ fn basic_symbol_table() {
let (symbols, _) = add_symbols(src);
symbols.types.table.get(&make_fqsn(&["Option"])).unwrap();
symbols.types.table.get(&make_fqsn(&["Option", "Some"])).unwrap();
symbols.types.table.get(&make_fqsn(&["Option", "None"])).unwrap();
}
#[test]

6
schala-lang/language/src/tree_walk_eval/evaluator.rs
View File

@ -25,7 +25,7 @@ impl<'a, 'b> Evaluator<'a, 'b> {
for statement in reduced.entrypoint.into_iter() {
match self.statement(statement) {
Ok(Some(output)) if repl => acc.push(Ok(output.to_repl())),
Ok(Some(output)) if repl => acc.push(Ok(output.to_repl(&self.type_context))),
Ok(_) => (),
Err(error) => {
acc.push(Err(error.msg));
@ -242,11 +242,11 @@ impl<'a, 'b> Evaluator<'a, 'b> {
}
/* builtin functions */
(IOPrint, &[ref anything]) => {
print!("{}", anything.to_repl());
print!("{}", anything.to_repl(self.type_context));
Primitive::Tuple(vec![])
}
(IOPrintLn, &[ref anything]) => {
print!("{}", anything.to_repl());
print!("{}", anything.to_repl(self.type_context));
Primitive::Tuple(vec![])
}
(IOGetLine, &[]) => {

19
schala-lang/language/src/tree_walk_eval/mod.rs
View File

@ -89,9 +89,9 @@ impl From<Primitive> for MemoryValue {
}
impl MemoryValue {
fn to_repl(&self) -> String {
fn to_repl(&self, type_context: &TypeContext) -> String {
match self {
MemoryValue::Primitive(ref prim) => prim.to_repl(),
MemoryValue::Primitive(ref prim) => prim.to_repl(type_context),
MemoryValue::Function(..) => "<function>".to_string(),
}
}
@ -125,11 +125,16 @@ enum Primitive {
}
impl Primitive {
fn to_repl(&self) -> String {
fn to_repl(&self, type_context: &TypeContext) -> String {
match self {
Primitive::Object { type_id, items, .. } if items.is_empty() => type_id.local_name().to_string(),
Primitive::Object { type_id, items, .. } => {
format!("{}{}", type_id.local_name(), paren_wrapped(items.iter().map(|item| item.to_repl())))
Primitive::Object { type_id, items, tag } if items.is_empty() =>
type_context.variant_local_name(type_id, *tag).unwrap().to_string(),
Primitive::Object { type_id, items, tag } => {
format!(
"{}{}",
type_context.variant_local_name(type_id, *tag).unwrap(),
paren_wrapped(items.iter().map(|item| item.to_repl(type_context)))
)
}
Primitive::Literal(lit) => match lit {
Literal::Nat(n) => format!("{}", n),
@ -138,7 +143,7 @@ impl Primitive {
Literal::Bool(b) => format!("{}", b),
Literal::StringLit(s) => format!("\"{}\"", s),
},
Primitive::Tuple(terms) => paren_wrapped(terms.iter().map(|x| x.to_repl())),
Primitive::Tuple(terms) => paren_wrapped(terms.iter().map(|x| x.to_repl(type_context))),
Primitive::Callable(..) => "<some-callable>".to_string(),
}
}

122
schala-lang/language/src/type_inference/mod.rs
View File

@ -1,34 +1,110 @@
use std::{fmt, rc::Rc};
use std::{collections::HashMap, convert::From};
//TODO need to hook this into the actual typechecking system somehow
#[derive(Debug, Clone)]
pub struct TypeId {
local_name: Rc<String>,
//use crate::symbol_table::Fqsn;
use crate::{
ast::TypeIdentifier,
identifier::{define_id_kind, Id, IdStore},
};
define_id_kind!(TypeItem);
pub type TypeId = Id<TypeItem>;
pub struct TypeContext {
defined_types: HashMap<TypeId, DefinedType>,
type_id_store: IdStore<TypeItem>,
}
impl fmt::Display for TypeId {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "TypeId:{}", self.local_name())
}
}
impl TypeId {
pub fn local_name(&self) -> &str {
self.local_name.as_ref()
}
}
pub struct TypeContext;
impl TypeContext {
pub fn new() -> Self {
Self
Self { defined_types: HashMap::new(), type_id_store: IdStore::new() }
}
//TODO flesh this out...
pub fn id_from_name(&self, name: &str) -> TypeId {
TypeId { local_name: Rc::new(name.to_string()) }
pub fn register_type(&mut self, builder: TypeBuilder) -> TypeId {
let type_id = self.type_id_store.fresh();
let defined = DefinedType {
name: builder.name,
//TODO come up with a canonical tag order
variants: builder.variants.into_iter().map(|builder| Variant { name: builder.name }).collect(),
};
self.defined_types.insert(type_id, defined);
type_id
}
pub fn variant_local_name(&self, type_id: &TypeId, tag: u32) -> Option<&str> {
self.defined_types
.get(type_id)
.and_then(|defined| defined.variants.get(tag as usize))
.map(|variant| variant.name.as_ref())
}
}
/// A type defined in program source code, as opposed to a builtin.
#[allow(dead_code)]
struct DefinedType {
name: String,
//fqsn: Fqsn,
// the variants are in this list according to tag order
variants: Vec<Variant>,
}
struct Variant {
name: String,
}
/// Represents a type mentioned as a member of another type during the type registration process.
/// It may not have been registered itself in the relevant context.
#[allow(dead_code)]
pub struct PendingType {
inner: TypeIdentifier,
}
impl From<&TypeIdentifier> for PendingType {
fn from(type_identifier: &TypeIdentifier) -> Self {
Self { inner: type_identifier.clone() }
}
}
pub struct TypeBuilder {
name: String,
variants: Vec<VariantBuilder>,
}
impl TypeBuilder {
pub fn new(name: &str) -> Self {
Self { name: name.to_string(), variants: vec![] }
}
pub fn add_variant(&mut self, vb: VariantBuilder) {
self.variants.push(vb);
}
}
pub struct VariantBuilder {
name: String,
members: Vec<VariantMember>,
}
impl VariantBuilder {
pub fn new(name: &str) -> Self {
Self { name: name.to_string(), members: vec![] }
}
pub fn add_member(&mut self, member_ty: PendingType) {
self.members.push(VariantMember::Pending(member_ty));
}
// You can't call this and `add_member` on the same fn, there should be a runtime error when
// that's detected.
pub fn add_record_member(&mut self, name: &str, ty: PendingType) {
self.members.push(VariantMember::KeyVal(name.to_string(), ty));
}
}
enum VariantMember {
Pending(PendingType),
KeyVal(String, PendingType),
}
#[derive(Debug, Clone)]