conlang: Move all cl-libs into the compiler directory
This commit is contained in:
464
compiler/cl-interpret/src/interpret.rs
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464
compiler/cl-interpret/src/interpret.rs
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@@ -0,0 +1,464 @@
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//! A work-in-progress tree walk interpreter for Conlang
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//!
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//! Currently, major parts of the interpreter are not yet implemented, and major parts will never be
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//! implemented in its current form. Namely, since no [ConValue] has a stable location, it's
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//! meaningless to get a pointer to one, and would be undefined behavior to dereference a pointer to
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//! one in any situation.
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use std::borrow::Borrow;
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use super::*;
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use cl_ast::*;
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/// A work-in-progress tree walk interpreter for Conlang
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pub trait Interpret {
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/// Interprets this thing in the given [`Environment`].
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///
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/// Everything returns a value!™
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue>;
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}
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impl Interpret for File {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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for item in &self.items {
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item.interpret(env)?;
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}
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Ok(ConValue::Empty)
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}
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}
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impl Interpret for Item {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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match &self.kind {
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ItemKind::Alias(item) => item.interpret(env),
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ItemKind::Const(item) => item.interpret(env),
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ItemKind::Static(item) => item.interpret(env),
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ItemKind::Module(item) => item.interpret(env),
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ItemKind::Function(item) => item.interpret(env),
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ItemKind::Struct(item) => item.interpret(env),
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ItemKind::Enum(item) => item.interpret(env),
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ItemKind::Impl(item) => item.interpret(env),
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}
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}
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}
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impl Interpret for Alias {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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todo!("Interpret type alias in {env}")
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}
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}
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impl Interpret for Const {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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todo!("interpret const in {env}")
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}
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}
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impl Interpret for Static {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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todo!("interpret static in {env}")
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}
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}
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impl Interpret for Module {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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// TODO: Enter this module's namespace
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match &self.kind {
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ModuleKind::Inline(file) => file.interpret(env),
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ModuleKind::Outline => todo!("Load and parse external files"),
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}
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}
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}
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impl Interpret for Function {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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// register the function in the current environment
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env.insert_fn(self);
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Ok(ConValue::Empty)
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}
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}
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impl Interpret for Struct {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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todo!("Interpret structs in {env}")
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}
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}
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impl Interpret for Enum {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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todo!("Interpret enums in {env}")
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}
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}
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impl Interpret for Impl {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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todo!("Enter a struct's namespace and insert function definitions into it in {env}");
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}
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}
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impl Interpret for Stmt {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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let Self { extents: _, kind, semi } = self;
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let out = match kind {
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StmtKind::Empty => ConValue::Empty,
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StmtKind::Local(stmt) => stmt.interpret(env)?,
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StmtKind::Item(stmt) => stmt.interpret(env)?,
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StmtKind::Expr(stmt) => stmt.interpret(env)?,
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};
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Ok(match semi {
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Semi::Terminated => ConValue::Empty,
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Semi::Unterminated => out,
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})
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}
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}
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impl Interpret for Let {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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let Let { mutable: _, name: Identifier(name), ty: _, init } = self;
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let init = init.as_ref().map(|i| i.interpret(env)).transpose()?;
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env.insert(name, init);
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Ok(ConValue::Empty)
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}
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}
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impl Interpret for Expr {
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#[inline]
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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let Self { extents: _, kind } = self;
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kind.interpret(env)
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}
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}
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impl Interpret for ExprKind {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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match self {
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ExprKind::Assign(v) => v.interpret(env),
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ExprKind::Binary(v) => v.interpret(env),
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ExprKind::Unary(v) => v.interpret(env),
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ExprKind::Index(v) => v.interpret(env),
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ExprKind::Path(v) => v.interpret(env),
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ExprKind::Literal(v) => v.interpret(env),
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ExprKind::Array(v) => v.interpret(env),
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ExprKind::ArrayRep(v) => v.interpret(env),
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ExprKind::AddrOf(v) => v.interpret(env),
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ExprKind::Block(v) => v.interpret(env),
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ExprKind::Empty => Ok(ConValue::Empty),
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ExprKind::Group(v) => v.interpret(env),
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ExprKind::Tuple(v) => v.interpret(env),
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ExprKind::Loop(v) => v.interpret(env),
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ExprKind::While(v) => v.interpret(env),
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ExprKind::If(v) => v.interpret(env),
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ExprKind::For(v) => v.interpret(env),
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ExprKind::Break(v) => v.interpret(env),
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ExprKind::Return(v) => v.interpret(env),
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ExprKind::Continue(v) => v.interpret(env),
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}
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}
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}
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impl Interpret for Assign {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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let Assign { kind: op, parts } = self;
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let (head, tail) = parts.borrow();
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// Resolve the head pattern
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let head = match &head {
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ExprKind::Path(Path { parts, .. }) if parts.len() == 1 => {
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match parts.last().expect("parts should not be empty") {
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PathPart::SuperKw => Err(Error::NotAssignable)?,
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PathPart::SelfKw => todo!("Assignment to `self`"),
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PathPart::Ident(Identifier(s)) => s,
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}
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}
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ExprKind::Index(_) => todo!("Assignment to an index operation"),
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ExprKind::Path(_) => todo!("Path expression resolution (IMPORTANT)"),
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ExprKind::Empty | ExprKind::Group(_) | ExprKind::Tuple(_) => {
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todo!("Pattern Destructuring?")
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}
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_ => Err(Error::NotAssignable)?,
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};
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// Get the initializer and the tail
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let init = tail.interpret(env)?;
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let target = env.get_mut(head)?;
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if let AssignKind::Plain = op {
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use std::mem::discriminant as variant;
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// runtime typecheck
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match target {
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Some(value) if variant(value) == variant(&init) => {
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*value = init;
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}
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value @ None => *value = Some(init),
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_ => Err(Error::TypeError)?,
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}
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return Ok(ConValue::Empty);
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}
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let Some(target) = target else {
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return Err(Error::NotInitialized(head.into()));
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};
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match op {
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AssignKind::Add => target.add_assign(init)?,
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AssignKind::Sub => target.sub_assign(init)?,
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AssignKind::Mul => target.mul_assign(init)?,
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AssignKind::Div => target.div_assign(init)?,
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AssignKind::Rem => target.rem_assign(init)?,
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AssignKind::And => target.bitand_assign(init)?,
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AssignKind::Or => target.bitor_assign(init)?,
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AssignKind::Xor => target.bitxor_assign(init)?,
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AssignKind::Shl => target.shl_assign(init)?,
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AssignKind::Shr => target.shr_assign(init)?,
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_ => (),
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}
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Ok(ConValue::Empty)
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}
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}
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impl Interpret for Binary {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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let Binary { kind, parts } = self;
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let (head, tail) = parts.borrow();
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let head = head.interpret(env)?;
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// Short-circuiting ops
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match kind {
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BinaryKind::LogAnd => {
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return if head.truthy()? {
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tail.interpret(env)
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} else {
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Ok(head)
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}; // Short circuiting
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}
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BinaryKind::LogOr => {
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return if !head.truthy()? {
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tail.interpret(env)
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} else {
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Ok(head)
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}; // Short circuiting
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}
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BinaryKind::LogXor => {
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return Ok(ConValue::Bool(
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head.truthy()? ^ tail.interpret(env)?.truthy()?,
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));
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}
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_ => {}
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}
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let tail = tail.interpret(env)?;
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match kind {
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BinaryKind::Mul => env.call("mul", &[head, tail]),
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BinaryKind::Div => env.call("div", &[head, tail]),
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BinaryKind::Rem => env.call("rem", &[head, tail]),
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BinaryKind::Add => env.call("add", &[head, tail]),
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BinaryKind::Sub => env.call("sub", &[head, tail]),
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BinaryKind::Shl => env.call("shl", &[head, tail]),
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BinaryKind::Shr => env.call("shr", &[head, tail]),
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BinaryKind::BitAnd => env.call("and", &[head, tail]),
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BinaryKind::BitOr => env.call("or", &[head, tail]),
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BinaryKind::BitXor => env.call("xor", &[head, tail]),
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BinaryKind::RangeExc => env.call("range_exc", &[head, tail]),
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BinaryKind::RangeInc => env.call("range_inc", &[head, tail]),
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BinaryKind::Lt => env.call("lt", &[head, tail]),
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BinaryKind::LtEq => env.call("lt_eq", &[head, tail]),
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BinaryKind::Equal => env.call("eq", &[head, tail]),
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BinaryKind::NotEq => env.call("neq", &[head, tail]),
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BinaryKind::GtEq => env.call("gt_eq", &[head, tail]),
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BinaryKind::Gt => env.call("gt", &[head, tail]),
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BinaryKind::Dot => todo!("search within a type's namespace!"),
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BinaryKind::Call => match tail {
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ConValue::Empty => head.call(env, &[]),
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ConValue::Tuple(args) => head.call(env, &args),
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_ => Err(Error::TypeError),
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},
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_ => Ok(head),
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}
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}
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}
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impl Interpret for Unary {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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let Unary { kind, tail } = self;
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let operand = tail.interpret(env)?;
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match kind {
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UnaryKind::Deref => env.call("deref", &[operand]),
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UnaryKind::Neg => env.call("neg", &[operand]),
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UnaryKind::Not => env.call("not", &[operand]),
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UnaryKind::At => {
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println!("{operand}");
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Ok(operand)
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}
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UnaryKind::Tilde => unimplemented!("Tilde operator"),
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}
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}
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}
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impl Interpret for Index {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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let Self { head, indices } = self;
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let mut head = head.interpret(env)?;
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for index in indices {
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head = head.index(&index.interpret(env)?)?;
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}
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Ok(head)
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}
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}
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impl Interpret for Path {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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let Self { absolute: _, parts } = self;
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if parts.len() == 1 {
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match parts.last().expect("parts should not be empty") {
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PathPart::SuperKw | PathPart::SelfKw => todo!("Path navigation"),
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PathPart::Ident(Identifier(s)) => env.get(s).cloned(),
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}
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} else {
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todo!("Path navigation!")
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}
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}
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}
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impl Interpret for Literal {
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fn interpret(&self, _env: &mut Environment) -> IResult<ConValue> {
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Ok(match self {
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Literal::String(value) => ConValue::from(value.as_str()),
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Literal::Char(value) => ConValue::Char(*value),
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Literal::Bool(value) => ConValue::Bool(*value),
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// Literal::Float(value) => todo!("Float values in interpreter: {value:?}"),
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Literal::Int(value) => ConValue::Int(*value as _),
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})
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}
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}
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impl Interpret for Array {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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let Self { values } = self;
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let mut out = vec![];
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for expr in values {
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out.push(expr.interpret(env)?)
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}
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Ok(ConValue::Array(out))
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}
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}
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impl Interpret for ArrayRep {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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let Self { value, repeat } = self;
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let repeat = match repeat.interpret(env)? {
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ConValue::Int(v) => v,
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_ => Err(Error::TypeError)?,
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};
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let value = value.interpret(env)?;
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Ok(ConValue::Array(vec![value; repeat as usize]))
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}
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}
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impl Interpret for AddrOf {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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let Self { count: _, mutable: _, expr } = self;
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// this is stupid
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todo!("Create reference\nfrom expr: {expr}\nin env:\n{env}\n")
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}
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}
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impl Interpret for Block {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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let Self { stmts } = self;
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let mut env = env.frame("block");
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let mut out = ConValue::Empty;
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for stmt in stmts {
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out = stmt.interpret(&mut env)?;
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}
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Ok(out)
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}
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}
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impl Interpret for Group {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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let Self { expr } = self;
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expr.interpret(env)
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}
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}
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impl Interpret for Tuple {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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let Self { exprs } = self;
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Ok(ConValue::Tuple(exprs.iter().try_fold(
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vec![],
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|mut out, element| {
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out.push(element.interpret(env)?);
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Ok(out)
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},
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)?))
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}
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}
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impl Interpret for Loop {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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let Self { body } = self;
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loop {
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match body.interpret(env) {
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Err(Error::Break(value)) => return Ok(value),
|
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Err(Error::Continue) => continue,
|
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e => e?,
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};
|
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}
|
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}
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}
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impl Interpret for While {
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
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let Self { cond, pass, fail } = self;
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loop {
|
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if cond.interpret(env)?.truthy()? {
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match pass.interpret(env) {
|
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Err(Error::Break(value)) => return Ok(value),
|
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Err(Error::Continue) => continue,
|
||||
e => e?,
|
||||
};
|
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} else {
|
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break fail.interpret(env);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
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impl Interpret for If {
|
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
|
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let Self { cond, pass, fail } = self;
|
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if cond.interpret(env)?.truthy()? {
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pass.interpret(env)
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} else {
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fail.interpret(env)
|
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}
|
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}
|
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}
|
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impl Interpret for For {
|
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fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
|
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let Self { bind: Identifier(name), cond, pass, fail } = self;
|
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// TODO: A better iterator model
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||||
let mut bounds = match cond.interpret(env)? {
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ConValue::RangeExc(a, b) => a..=b,
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ConValue::RangeInc(a, b) => a..=b,
|
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_ => Err(Error::TypeError)?,
|
||||
};
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loop {
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||||
let mut env = env.frame("loop variable");
|
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if let Some(loop_var) = bounds.next() {
|
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env.insert(name, Some(loop_var.into()));
|
||||
match pass.interpret(&mut env) {
|
||||
Err(Error::Break(value)) => return Ok(value),
|
||||
Err(Error::Continue) => continue,
|
||||
result => result?,
|
||||
};
|
||||
} else {
|
||||
break fail.interpret(&mut env);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
impl Interpret for Else {
|
||||
fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
|
||||
let Self { body } = self;
|
||||
match body {
|
||||
Some(body) => body.interpret(env),
|
||||
None => Ok(ConValue::Empty),
|
||||
}
|
||||
}
|
||||
}
|
||||
impl Interpret for Continue {
|
||||
fn interpret(&self, _env: &mut Environment) -> IResult<ConValue> {
|
||||
Err(Error::Continue)
|
||||
}
|
||||
}
|
||||
impl Interpret for Return {
|
||||
fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
|
||||
let Self { body } = self;
|
||||
Err(Error::Return(
|
||||
body.as_ref()
|
||||
.map(|body| body.interpret(env))
|
||||
.unwrap_or(Ok(ConValue::Empty))?,
|
||||
))
|
||||
}
|
||||
}
|
||||
impl Interpret for Break {
|
||||
fn interpret(&self, env: &mut Environment) -> IResult<ConValue> {
|
||||
let Self { body } = self;
|
||||
Err(Error::Break(
|
||||
body.as_ref()
|
||||
.map(|body| body.interpret(env))
|
||||
.unwrap_or(Ok(ConValue::Empty))?,
|
||||
))
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user