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ast.rs
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314 lines (294 loc) · 6.24 KB
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//! Implement abstract syntax tree nodes for the python language.
//!
//! Roughly equivalent to this: https://docs.python.org/3/library/ast.html
pub use super::lexer::Location;
use num_bigint::BigInt;
/*
#[derive(Debug)]
#[derive(Debug)]
pub struct Node {
pub location: Location,
}
*/
#[derive(Debug, PartialEq)]
pub enum Top {
Program(Program),
Statement(LocatedStatement),
Expression(Expression),
}
#[derive(Debug, PartialEq)]
pub struct Program {
pub statements: Vec<LocatedStatement>,
}
#[derive(Debug, PartialEq)]
pub struct SingleImport {
pub module: String,
// (symbol name in module, name it should be assigned locally)
pub symbol: Option<String>,
pub alias: Option<String>,
}
#[derive(Debug, PartialEq)]
pub struct Located<T> {
pub location: Location,
pub node: T,
}
pub type LocatedStatement = Located<Statement>;
/// Abstract syntax tree nodes for python statements.
#[derive(Debug, PartialEq)]
pub enum Statement {
Break,
Continue,
Return {
value: Option<Vec<Expression>>,
},
Import {
import_parts: Vec<SingleImport>,
},
Pass,
Assert {
test: Expression,
msg: Option<Expression>,
},
Delete {
targets: Vec<Expression>,
},
Assign {
targets: Vec<Expression>,
value: Expression,
},
AugAssign {
target: Box<Expression>,
op: Operator,
value: Box<Expression>,
},
Expression {
expression: Expression,
},
Global {
names: Vec<String>,
},
Nonlocal {
names: Vec<String>,
},
If {
test: Expression,
body: Vec<LocatedStatement>,
orelse: Option<Vec<LocatedStatement>>,
},
While {
test: Expression,
body: Vec<LocatedStatement>,
orelse: Option<Vec<LocatedStatement>>,
},
With {
items: Vec<WithItem>,
body: Vec<LocatedStatement>,
},
For {
target: Expression,
iter: Vec<Expression>,
body: Vec<LocatedStatement>,
orelse: Option<Vec<LocatedStatement>>,
},
Raise {
exception: Option<Expression>,
cause: Option<Expression>,
},
Try {
body: Vec<LocatedStatement>,
handlers: Vec<ExceptHandler>,
orelse: Option<Vec<LocatedStatement>>,
finalbody: Option<Vec<LocatedStatement>>,
},
ClassDef {
name: String,
body: Vec<LocatedStatement>,
bases: Vec<Expression>,
keywords: Vec<Keyword>,
decorator_list: Vec<Expression>,
// TODO: docstring: String,
},
FunctionDef {
name: String,
args: Parameters,
// docstring: String,
body: Vec<LocatedStatement>,
decorator_list: Vec<Expression>,
},
}
#[derive(Debug, PartialEq)]
pub struct WithItem {
pub context_expr: Expression,
pub optional_vars: Option<Expression>,
}
#[derive(Debug, PartialEq)]
pub enum Expression {
BoolOp {
a: Box<Expression>,
op: BooleanOperator,
b: Box<Expression>,
},
Binop {
a: Box<Expression>,
op: Operator,
b: Box<Expression>,
},
Subscript {
a: Box<Expression>,
b: Box<Expression>,
},
Unop {
op: UnaryOperator,
a: Box<Expression>,
},
Yield {
value: Option<Box<Expression>>,
},
YieldFrom {
value: Box<Expression>,
},
Compare {
a: Box<Expression>,
op: Comparison,
b: Box<Expression>,
},
Attribute {
value: Box<Expression>,
name: String,
},
Call {
function: Box<Expression>,
args: Vec<Expression>,
keywords: Vec<Keyword>,
},
Number {
value: Number,
},
List {
elements: Vec<Expression>,
},
Tuple {
elements: Vec<Expression>,
},
Dict {
elements: Vec<(Expression, Expression)>,
},
Set {
elements: Vec<Expression>,
},
Comprehension {
kind: Box<ComprehensionKind>,
generators: Vec<Comprehension>,
},
Starred {
value: Box<Expression>,
},
Slice {
elements: Vec<Expression>,
},
String {
value: String,
},
Bytes {
value: Vec<u8>,
},
Identifier {
name: String,
},
Lambda {
args: Parameters,
body: Box<Expression>,
},
IfExpression {
test: Box<Expression>,
body: Box<Expression>,
orelse: Box<Expression>,
},
True,
False,
None,
}
/*
* In cpython this is called arguments, but we choose parameters to
* distinguish between function parameters and actual call arguments.
*/
#[derive(Debug, PartialEq, Default)]
pub struct Parameters {
pub args: Vec<String>,
pub kwonlyargs: Vec<String>,
pub vararg: Option<Option<String>>, // Optionally we handle optionally named '*args' or '*'
pub kwarg: Option<Option<String>>,
pub defaults: Vec<Expression>,
pub kw_defaults: Vec<Option<Expression>>,
}
#[derive(Debug, PartialEq)]
pub enum ComprehensionKind {
GeneratorExpression { element: Expression },
List { element: Expression },
Set { element: Expression },
Dict { key: Expression, value: Expression },
}
#[derive(Debug, PartialEq)]
pub struct Comprehension {
pub target: Expression,
pub iter: Expression,
pub ifs: Vec<Expression>,
}
#[derive(Debug, PartialEq)]
pub struct Keyword {
pub name: Option<String>,
pub value: Expression,
}
#[derive(Debug, PartialEq)]
pub struct ExceptHandler {
pub typ: Option<Expression>,
pub name: Option<String>,
pub body: Vec<LocatedStatement>,
}
#[derive(Debug, PartialEq)]
pub enum Operator {
Add,
Sub,
Mult,
MatMult,
Div,
Mod,
Pow,
LShift,
RShift,
BitOr,
BitXor,
BitAnd,
FloorDiv,
}
#[derive(Debug, PartialEq)]
pub enum BooleanOperator {
And,
Or,
}
#[derive(Debug, PartialEq)]
pub enum UnaryOperator {
Pos,
Neg,
Not,
Inv,
}
#[derive(Debug, PartialEq)]
pub enum Comparison {
Equal,
NotEqual,
Less,
LessOrEqual,
Greater,
GreaterOrEqual,
In,
NotIn,
Is,
IsNot,
}
#[derive(Debug, PartialEq)]
pub enum Number {
Integer { value: BigInt },
Float { value: f64 },
Complex { real: f64, imag: f64 },
}