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use std::fmt::{self, Display, Formatter};
use crate::lex::token::Location;
use super::nodes::{
ArrayAccessExpression, ArrayExpression, BinaryOperatorNode, BlockExpression, CallExpression,
FnExpression, Identifier, IfExpression, LoopExpression, MemberAccessExpression,
SimpleLiteralNode, StrExpression, StrPartKind, UnaryOperatorNode,
};
#[derive(Debug, Clone)]
pub struct Expression {
// TODO: Sometimes this location is duplicated for no reason,
// i.e. in the UnaryExpression, since the token for the UnaryOperatorNode
// will be the same as the location for the expression...
// Can we do something about it or is some duplication fine?
pub at: Location,
pub kind: ExpressionKind,
}
#[derive(Debug, Clone)]
pub enum ExpressionKind {
Binary {
left: Box<Expression>,
op: BinaryOperatorNode,
right: Box<Expression>,
},
Unary {
op: UnaryOperatorNode,
right: Box<Expression>,
},
Call(Box<CallExpression>),
ArrayAccess(Box<ArrayAccessExpression>),
MemberAccess(Box<MemberAccessExpression>),
Group(Box<Expression>),
Block(Box<BlockExpression>),
If(Box<IfExpression>),
Loop(Box<LoopExpression>),
StrLiteral(Box<StrExpression>),
FnLiteral(Box<FnExpression>),
ArrayLiteral(ArrayExpression),
SimpleLiteral(SimpleLiteralNode),
Identifier(Identifier),
}
impl Display for Expression {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
self.nested_fmt(f, 0)
}
}
impl Expression {
pub(crate) fn nested_fmt(&self, f: &mut Formatter<'_>, depth: usize) -> fmt::Result {
let pad = " ".repeat(depth);
match &self.kind {
ExpressionKind::Binary { left, op, right } => {
writeln!(f, "{}Binary:", pad)?;
writeln!(f, "{}- Left:", pad)?;
left.nested_fmt(f, depth + 1)?;
writeln!(f, "{}- Operator: {:?}", pad, op)?;
writeln!(f, "{}- Right:", pad)?;
right.nested_fmt(f, depth + 1)?;
}
ExpressionKind::Unary { op, right } => {
writeln!(f, "{}Unary:", pad)?;
writeln!(f, "{}- Operator: {:?}", pad, op)?;
writeln!(f, "{}- Right:", pad)?;
right.nested_fmt(f, depth + 1)?;
}
ExpressionKind::Call(expr) => {
writeln!(f, "{}Function Call:", pad)?;
writeln!(f, "{}- Called:", pad)?;
expr.called.nested_fmt(f, depth + 1)?;
for (i, e) in expr.arguments.iter().enumerate() {
writeln!(f, "{}- Argument {}:", pad, i)?;
e.nested_fmt(f, depth + 1)?;
}
}
ExpressionKind::ArrayAccess(expr) => {
writeln!(f, "{}Array Access:", pad)?;
writeln!(f, "{}- Array:", pad)?;
expr.array.nested_fmt(f, depth + 1)?;
writeln!(f, "{}- Index:", pad)?;
expr.index.nested_fmt(f, depth + 1)?;
}
ExpressionKind::MemberAccess(expr) => {
writeln!(f, "{}Member Access:", pad)?;
writeln!(f, "{}- Object:", pad)?;
expr.object.nested_fmt(f, depth + 1)?;
writeln!(f, "{}- Member Name: {}", pad, expr.member_name)?;
}
ExpressionKind::Group(expr) => {
writeln!(f, "{}Group:", pad)?;
expr.nested_fmt(f, depth + 1)?;
}
ExpressionKind::Block(expr) => {
Self::block_fmt(f, &expr, depth + 1)?;
}
ExpressionKind::StrLiteral(expr) => {
writeln!(f, "{}Str:", pad)?;
for (i, statement) in expr.parts.iter().enumerate() {
writeln!(f, "{}- {}:", pad, i)?;
match &statement.kind {
StrPartKind::Literal(literal) => {
writeln!(f, "{}{}", " ".repeat(depth + 1), literal.clone())
}
StrPartKind::Embed(block) => block.nested_fmt(f, depth + 1),
}?;
}
}
ExpressionKind::FnLiteral(expr) => {
write!(f, "{}Fn (", pad)?;
// Write self receiver
if expr.header.has_self_receiver {
write!(f, "self, ")?;
}
// Write parameters
for p in expr.header.parameters.iter() {
write!(
f,
"{}: {}, ",
p.identifier,
p.type_constraint.as_ref().unwrap_or(&"_".into())
)?;
}
// Write return type
writeln!(
f,
") -> {}:",
expr.header.return_type.as_ref().unwrap_or(&"_".into())
)?;
Self::block_fmt(f, &expr.body, depth + 1)?;
}
ExpressionKind::ArrayLiteral(expr) => {
writeln!(f, "{}Array Literal:", pad)?;
for (i, c) in expr.elements.iter().enumerate() {
writeln!(f, "{}- Element {}:", pad, i)?;
c.nested_fmt(f, depth + 1)?;
}
}
ExpressionKind::SimpleLiteral(literal) => {
writeln!(f, "{}Literal: {:?}", pad, literal)?;
}
ExpressionKind::Identifier(identifier) => {
writeln!(f, "{}Identifier: {:?}", pad, identifier)?;
}
ExpressionKind::If(expr) => {
writeln!(f, "{}If:", pad)?;
for (i, c) in expr.conditionals.iter().enumerate() {
writeln!(f, "{}- Condition {}:", pad, i)?;
c.condition.nested_fmt(f, depth + 1)?;
writeln!(f, "{}- Body {}:", pad, i)?;
Self::block_fmt(f, &c.block, depth + 1)?;
}
if let Some(e) = &expr.else_block {
writeln!(f, "{}- Else:", pad)?;
Self::block_fmt(f, e, depth + 1)?;
}
}
ExpressionKind::Loop(expr) => {
writeln!(f, "{}Loop:", pad)?;
if let Some(loop_condition) = &expr.condition {
writeln!(f, "{}- Condition:", pad)?;
loop_condition.nested_fmt(f, depth + 1)?;
}
writeln!(f, "{}- Body:", pad)?;
Self::block_fmt(f, &expr.body, depth + 1)?;
}
}
Ok(())
}
fn block_fmt(f: &mut Formatter<'_>, block: &BlockExpression, depth: usize) -> fmt::Result {
let pad = " ".repeat(depth);
writeln!(f, "{}Block:", pad)?;
for (i, statement) in block.statements.iter().enumerate() {
writeln!(f, "{}- {}:", pad, i)?;
statement.nested_fmt(f, depth + 1)?;
}
if let Some(tail_expression) = &block.tail_expression {
writeln!(f, "{}- Tail:", pad)?;
tail_expression.nested_fmt(f, depth + 1)?;
}
Ok(())
}
}
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