Move syntax tree to its own file
This commit is contained in:
parent
e42936fb4a
commit
1044939b32
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@ -1,7 +1,7 @@
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//! Conversion of AST to intermediate representation.
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use crate::ir::IR;
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use crate::SyntaxTree;
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use crate::syntax::SyntaxTree;
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/// Compiles an abstract syntax tree into intermediate representation; this assumes the code already
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/// type-checks, and emits unoptimized IR.
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255
axc/src/lib.rs
255
axc/src/lib.rs
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@ -5,259 +5,8 @@
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#![deny(missing_docs)]
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pub mod ast2ir;
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pub mod backends;
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pub mod ir;
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pub mod parser;
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pub mod syntax;
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pub mod typeck;
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pub mod backends;
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use num_bigint::BigUint;
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/// A concrete syntax tree. This represents the full content of an AlexScript program, including all
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/// whitespace, comments, and tokens: the source code of the original program can be recovered
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/// completely using the syntax tree.
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pub struct SyntaxTree {}
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/// Top-level statements, making up the overall program.
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pub enum Statement {
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/// Declaration of an abstract data type.
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TypeDefinition {
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/// The type being defined. This is only allowed to be `Named` or `Application`.
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left: Type,
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/// The possible constructors of the data type.
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constructors: Vec<TypeConstructor>,
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},
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/// Declaration that a type implements a type class.
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InstanceDefinition {
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/// The name of the type class.
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class_name: String,
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/// The type that conforms to the type class.
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typ: Type,
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/// The list of declarations that dictate the type's behavior when treated as an instance of
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/// the type class.
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decls: Vec<ClassDeclaration>,
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},
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/// Other declarations.
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ClassDeclaration(ClassDeclaration),
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}
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/// Top-level statements that are also allowed to occur within a type class definition, and which
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/// therefore have an optional rather than strictly-required right-hand side, e.g., `type X;` rather
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/// than `type X = Y;`.
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pub enum ClassDeclaration {
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/// Declaration of a function or constant.
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Function {
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/// Name of the function and its arguments.
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name: String,
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/// The function arguments.
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arguments: Vec<Pattern>,
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/// The definition of the function.
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definition: Option<Expr>,
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},
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/// Declaration of a type that is a literal alias for another type.
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TypeAlias {
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/// The type being defined. This is only allowed to be `Named` or `Application`.
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left: Type,
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/// The target type.
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right: Option<Type>,
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},
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/// Declaration of a type class.
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ClassDefinition {
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/// The name of the class.
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name: String,
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/// The type variable representing a type conforming to the class.
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var: String,
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/// The list of declarations (optionally filled-in) that are necessary for a type to conform
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/// to the type class.
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decls: Vec<ClassDeclaration>,
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},
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}
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/// A possible constructor for an abstract data type.
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pub struct TypeConstructor {
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/// The name of the constructor.
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pub name: String,
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/// The arguments to the abstract data type.
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pub args: Vec<Type>,
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}
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/// Expressions.
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pub enum Expr {
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/// Unary operators, e.g., `-5`.
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UnaryOp {
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/// The text of the operator.
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kind: String,
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/// The value being operated upon.
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val: Box<Expr>,
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},
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/// Binary operators, e.g., `5 + 5`.
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BinaryOp {
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/// The text of the operator.
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kind: String,
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/// The left side of the operator.
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left: Box<Expr>,
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/// The right side of the operator.
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right: Box<Expr>,
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},
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/// Function application, e.g., `sin x`.
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Application {
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/// The function being applied. For curried functions with multiple arguments (e.g., `atan2
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/// y x`), this is another expression of type `Application`.
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func: Box<Expr>,
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/// The argument to which the function is being applied.
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argument: Box<Expr>,
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},
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/// Defining of temporary variables, e.g., `let x = 5 in x + x`.
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Let {
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/// The pattern being bound.
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left: Pattern,
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/// The variable the pattern is matching.
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right: Box<Expr>,
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/// The expression the pattern is being substituted into.
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into: Box<Expr>,
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},
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/// Matching of multiple cases, e.g., `match x { 5 => 'a', 6 => 'b' }`.
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Match {
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/// The expression being matched upon.
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matcher: Box<Expr>,
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/// The possible cases of the `match` expression.
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cases: Vec<(Pattern, Expr)>,
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},
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/// Record initialization, e.g., `{ pointer: xyz, length: 12 }`.
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Record {
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/// The elements of the record.
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elements: Vec<(String, Expr)>,
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},
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/// Anonymous functions, e.g., `fn x -> x + 1`.
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Lambda {
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/// Arguments to the lambda; multiple of these are equivalent to stacking lambdas by
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/// currying.
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arguments: Vec<Pattern>,
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/// The result of the lambda.
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result: Box<Expr>,
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},
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/// Variable references, possibly namespaced, e.g., `foo::bar::baz`.
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VariableReference(Vec<String>),
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/// Dot subscripts, e.g., `foo.bar`.
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DotSubscript {
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/// The left side of the subscript.
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value: Box<Expr>,
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/// The right side of the subscript; this is only allowed to be a single word.
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subscript: String,
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},
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/// Bracket subscripts, e.g., `foo[bar]`.
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BracketSubscript {
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/// The left side of the subscript.
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value: Box<Expr>,
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/// The right side of the subscript.
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subscript: Box<Expr>,
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},
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/// Literal tokens, e.g., strings and numbers.
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Literal(Literal),
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}
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/// Type names.
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pub enum Type {
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/// `Foo`
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Named(String),
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/// `List Int`
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Application {
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/// The function being applied. This must be a generic type.
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function: Box<Type>,
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/// The expression given as an argument to the type. This can be any expression, to allow
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/// const generics; in most cases, though, it should be just a normal type.
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expression: Box<Expr>,
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},
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/// `(a, b)`
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Tuple(Vec<Type>),
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/// `{ a: x, b: y }`
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Record(Vec<(String, Type)>),
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}
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/// Patterns for use in function arguments, lambda arguments, `let` statements, and `match`
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/// statements.
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pub enum Pattern {
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/// `(a, b)`
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Tuple(Vec<Pattern>),
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/// `a: String`
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TypeAnnotated {
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/// The pattern being annotated.
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pat: Box<Pattern>,
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/// The type that `pat` is being asserted to have.
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typ: Box<Type>,
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},
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/// `Foo`
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Exact(String),
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/// `Foo { a: x, b: y, ... }`
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Destructure(String, Record),
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/// `a`
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Capture(String),
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/// `_`
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Ignore,
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/// `"hello"`
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Literal(Literal),
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}
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/// Record syntax blocks, e.g., "{a: b, c: d, ...}".
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pub struct Record {
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/// The named members of the record, in order of occurrence.
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pub members: Vec<(String, Expr)>,
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/// Whether the record ends with "..."; this allows ignoring blocks.
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pub inexhaustive: bool,
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}
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/// Literal values included in source code.
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pub enum Literal {
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/// `"hello"`
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String(String),
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/// `123`
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Integer(BigUint),
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/// `123.456`
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Float(f64),
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}
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@ -23,6 +23,14 @@ impl Display for ParserError {
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impl Error for ParserError {}
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/// Parser for AlexScript code.
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pub fn parser() -> impl Parser<char, crate::SyntaxTree, Error = Simple<char>> {
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pub fn parser() -> impl Parser<char, crate::syntax::SyntaxTree, Error = Simple<char>> {
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filter(|c: &char| c.is_numeric()).map(|_| todo!())
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}
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fn parse_expression() -> impl Parser<char, crate::syntax::Expr, Error = Simple<char>> {
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parser().map(|_| todo!())
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}
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fn parse_type() -> impl Parser<char, crate::syntax::Type, Error = Simple<char>> {
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parser().map(|_| todo!())
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}
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253
axc/src/syntax.rs
Normal file
253
axc/src/syntax.rs
Normal file
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@ -0,0 +1,253 @@
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//! Syntax tree for AlexScript code.
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use num_bigint::BigUint;
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/// A concrete syntax tree. This represents the full content of an AlexScript program, including all
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/// whitespace, comments, and tokens: the source code of the original program can be recovered
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/// completely using the syntax tree.
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pub struct SyntaxTree {}
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/// Top-level statements, making up the overall program.
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pub enum Statement {
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/// Declaration of an abstract data type.
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TypeDefinition {
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/// The type being defined. This is only allowed to be `Named` or `Application`.
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left: Type,
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/// The possible constructors of the data type.
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constructors: Vec<TypeConstructor>,
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},
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/// Declaration that a type implements a type class.
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InstanceDefinition {
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/// The name of the type class.
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class_name: String,
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/// The type that conforms to the type class.
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typ: Type,
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/// The list of declarations that dictate the type's behavior when treated as an instance of
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/// the type class.
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decls: Vec<ClassDeclaration>,
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},
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/// Other declarations.
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ClassDeclaration(ClassDeclaration),
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}
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/// Top-level statements that are also allowed to occur within a type class definition, and which
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/// therefore have an optional rather than strictly-required right-hand side, e.g., `type X;` rather
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/// than `type X = Y;`.
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pub enum ClassDeclaration {
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/// Declaration of a function or constant.
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Function {
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/// Name of the function and its arguments.
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name: String,
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/// The function arguments.
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arguments: Vec<Pattern>,
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/// The definition of the function.
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definition: Option<Expr>,
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},
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/// Declaration of a type that is a literal alias for another type.
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TypeAlias {
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/// The type being defined. This is only allowed to be `Named` or `Application`.
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left: Type,
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/// The target type.
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right: Option<Type>,
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},
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/// Declaration of a type class.
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ClassDefinition {
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/// The name of the class.
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name: String,
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/// The type variable representing a type conforming to the class.
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var: String,
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/// The list of declarations (optionally filled-in) that are necessary for a type to conform
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/// to the type class.
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decls: Vec<ClassDeclaration>,
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},
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}
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/// A possible constructor for an abstract data type.
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pub struct TypeConstructor {
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/// The name of the constructor.
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pub name: String,
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/// The arguments to the abstract data type.
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pub args: Vec<Type>,
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}
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/// Expressions.
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pub enum Expr {
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/// Unary operators, e.g., `-5`.
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UnaryOp {
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/// The text of the operator.
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kind: String,
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/// The value being operated upon.
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val: Box<Expr>,
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},
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/// Binary operators, e.g., `5 + 5`.
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BinaryOp {
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/// The text of the operator.
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kind: String,
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/// The left side of the operator.
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left: Box<Expr>,
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/// The right side of the operator.
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right: Box<Expr>,
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},
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/// Function application, e.g., `sin x`.
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Application {
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/// The function being applied. For curried functions with multiple arguments (e.g., `atan2
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/// y x`), this is another expression of type `Application`.
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func: Box<Expr>,
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/// The argument to which the function is being applied.
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argument: Box<Expr>,
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},
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/// Defining of temporary variables, e.g., `let x = 5 in x + x`.
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Let {
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/// The pattern being bound.
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left: Pattern,
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/// The variable the pattern is matching.
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right: Box<Expr>,
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/// The expression the pattern is being substituted into.
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into: Box<Expr>,
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},
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/// Matching of multiple cases, e.g., `match x { 5 => 'a', 6 => 'b' }`.
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Match {
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/// The expression being matched upon.
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matcher: Box<Expr>,
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/// The possible cases of the `match` expression.
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cases: Vec<(Pattern, Expr)>,
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},
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/// Record initialization, e.g., `{ pointer: xyz, length: 12 }`.
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Record {
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/// The elements of the record.
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elements: Vec<(String, Expr)>,
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},
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/// Anonymous functions, e.g., `fn x -> x + 1`.
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Lambda {
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/// Arguments to the lambda; multiple of these are equivalent to stacking lambdas by
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/// currying.
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arguments: Vec<Pattern>,
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/// The result of the lambda.
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result: Box<Expr>,
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},
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/// Variable references, possibly namespaced, e.g., `foo::bar::baz`.
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VariableReference(Vec<String>),
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/// Dot subscripts, e.g., `foo.bar`.
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DotSubscript {
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/// The left side of the subscript.
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value: Box<Expr>,
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/// The right side of the subscript; this is only allowed to be a single word.
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subscript: String,
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},
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/// Bracket subscripts, e.g., `foo[bar]`.
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BracketSubscript {
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/// The left side of the subscript.
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value: Box<Expr>,
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/// The right side of the subscript.
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subscript: Box<Expr>,
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},
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/// Literal tokens, e.g., strings and numbers.
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Literal(Literal),
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}
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/// Type names.
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pub enum Type {
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/// `Foo`
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Named(String),
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/// `List Int`
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Application {
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/// The function being applied. This must be a generic type.
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function: Box<Type>,
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|
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/// The expression given as an argument to the type. This can be any expression, to allow
|
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/// const generics; in most cases, though, it should be just a normal type.
|
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expression: Box<Expr>,
|
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},
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/// `(a, b)`
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Tuple(Vec<Type>),
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/// `{ a: x, b: y }`
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Record(Vec<(String, Type)>),
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}
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/// Patterns for use in function arguments, lambda arguments, `let` statements, and `match`
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/// statements.
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pub enum Pattern {
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/// `(a, b)`
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Tuple(Vec<Pattern>),
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/// `a: String`
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TypeAnnotated {
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/// The pattern being annotated.
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pat: Box<Pattern>,
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/// The type that `pat` is being asserted to have.
|
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typ: Box<Type>,
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},
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/// `Foo`
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Exact(String),
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/// `Foo { a: x, b: y, ... }`
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Destructure(String, Record),
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/// `a`
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Capture(String),
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/// `_`
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Ignore,
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/// `"hello"`
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Literal(Literal),
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}
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/// Record syntax blocks, e.g., "{a: b, c: d, ...}".
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pub struct Record {
|
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/// The named members of the record, in order of occurrence.
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pub members: Vec<(String, Expr)>,
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|
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/// Whether the record ends with "..."; this allows ignoring blocks.
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pub inexhaustive: bool,
|
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}
|
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|
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/// Literal values included in source code.
|
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pub enum Literal {
|
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/// `"hello"`
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String(String),
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|
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/// `123`
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Integer(BigUint),
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/// `123.456`
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Float(f64),
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}
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|
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@ -2,7 +2,7 @@
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use std::{error::Error, fmt::Display};
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use crate::SyntaxTree;
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use crate::syntax::SyntaxTree;
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|
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/// A compile-time type error from the user's source code.
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#[derive(Debug)]
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|
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