schala/schala-lang/language/src/ast.rs
2018-11-05 19:10:34 -08:00

181 lines
3.9 KiB
Rust

use std::rc::Rc;
use builtin::{BinOp, PrefixOp};
#[derive(Debug, PartialEq)]
pub struct AST(pub Vec<Statement>);
#[derive(Debug, PartialEq, Clone)]
pub enum Statement {
ExpressionStatement(Expression),
Declaration(Declaration),
}
pub type Block = Vec<Statement>;
pub type ParamName = Rc<String>;
pub type InterfaceName = Rc<String>; //should be a singleton I think??
pub type FormalParam = (ParamName, Option<TypeIdentifier>);
#[derive(Debug, PartialEq, Clone)]
pub enum Declaration {
FuncSig(Signature),
FuncDecl(Signature, Block),
TypeDecl {
name: TypeSingletonName,
body: TypeBody,
mutable: bool
},
TypeAlias(Rc<String>, Rc<String>), //should have TypeSingletonName in it, or maybe just String, not sure
Binding {
name: Rc<String>,
constant: bool,
expr: Expression,
},
Impl {
type_name: TypeIdentifier,
interface_name: Option<InterfaceName>,
block: Vec<Declaration>,
},
Interface {
name: Rc<String>,
signatures: Vec<Signature>
}
}
#[derive(Debug, PartialEq, Clone)]
pub struct Signature {
pub name: Rc<String>,
pub operator: bool,
pub params: Vec<FormalParam>,
pub type_anno: Option<TypeIdentifier>,
}
#[derive(Debug, PartialEq, Clone)]
pub struct TypeBody(pub Vec<Variant>);
#[derive(Debug, PartialEq, Clone)]
pub enum Variant {
UnitStruct(Rc<String>),
TupleStruct(Rc<String>, Vec<TypeIdentifier>),
Record(Rc<String>, Vec<(Rc<String>, TypeIdentifier)>),
}
#[derive(Debug, PartialEq, Clone)]
pub struct Expression(pub ExpressionType, pub Option<TypeIdentifier>);
#[derive(Debug, PartialEq, Clone)]
pub enum TypeIdentifier {
Tuple(Vec<TypeIdentifier>),
Singleton(TypeSingletonName)
}
#[derive(Debug, PartialEq, Clone)]
pub struct TypeSingletonName {
pub name: Rc<String>,
pub params: Vec<TypeIdentifier>,
}
#[derive(Debug, PartialEq, Clone)]
pub enum ExpressionType {
NatLiteral(u64),
FloatLiteral(f64),
StringLiteral(Rc<String>),
BoolLiteral(bool),
BinExp(BinOp, Box<Expression>, Box<Expression>),
PrefixExp(PrefixOp, Box<Expression>),
TupleLiteral(Vec<Expression>),
Value(Rc<String>),
NamedStruct {
name: Rc<String>,
fields: Vec<(Rc<String>, Expression)>,
},
Call {
f: Box<Expression>,
arguments: Vec<Expression>,
},
Index {
indexee: Box<Expression>,
indexers: Vec<Expression>,
},
IfExpression {
discriminator: Box<Discriminator>,
body: Box<IfExpressionBody>,
},
WhileExpression {
condition: Option<Box<Expression>>,
body: Block,
},
ForExpression {
enumerators: Vec<Enumerator>,
body: Box<ForBody>,
},
Lambda {
params: Vec<FormalParam>,
type_anno: Option<TypeIdentifier>,
body: Block,
},
ListLiteral(Vec<Expression>),
}
#[derive(Debug, PartialEq, Clone)]
pub enum Discriminator {
Simple(Expression),
BinOp(Expression, BinOp)
}
#[derive(Debug, PartialEq, Clone)]
pub enum IfExpressionBody {
SimpleConditional(Block, Option<Block>),
SimplePatternMatch(Pattern, Block, Option<Block>),
GuardList(Vec<GuardArm>)
}
#[derive(Debug, PartialEq, Clone)]
pub struct GuardArm {
pub guard: Guard,
pub body: Block,
}
#[derive(Debug, PartialEq, Clone)]
pub enum Guard {
Pat(Pattern),
HalfExpr(HalfExpr)
}
#[derive(Debug, PartialEq, Clone)]
pub struct HalfExpr {
pub op: Option<BinOp>,
pub expr: ExpressionType,
}
#[derive(Debug, PartialEq, Clone)]
pub enum Pattern {
Ignored,
TuplePattern(Vec<Pattern>),
Literal(PatternLiteral),
TupleStruct(Rc<String>, Vec<Pattern>),
Record(Rc<String>, Vec<(Rc<String>, Pattern)>),
}
#[derive(Debug, PartialEq, Clone)]
pub enum PatternLiteral {
NumPattern {
neg: bool,
num: ExpressionType,
},
StringPattern(Rc<String>),
BoolPattern(bool),
VarPattern(Rc<String>)
}
#[derive(Debug, PartialEq, Clone)]
pub struct Enumerator {
pub id: Rc<String>,
pub generator: Expression,
}
#[derive(Debug, PartialEq, Clone)]
pub enum ForBody {
MonadicReturn(Expression),
StatementBlock(Block),
}