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python.lalrpop
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1306 lines (1191 loc) · 36.7 KB
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// See also: file:///usr/share/doc/python/html/reference/grammar.html?highlight=grammar
// See also: https://github.com/antlr/grammars-v4/blob/master/python3/Python3.g4
// See also: file:///usr/share/doc/python/html/reference/compound_stmts.html#function-definitions
// See also: https://greentreesnakes.readthedocs.io/en/latest/nodes.html#keyword
use std::iter::FromIterator;
use crate::ast;
use crate::fstring::parse_located_fstring;
use crate::function::{ArgumentList, parse_args, parse_params};
use crate::error::LexicalError;
use crate::lexer;
use num_bigint::BigInt;
grammar;
// This is a hack to reduce the amount of lalrpop tables generated:
// For each public entry point, a full parse table is generated.
// By having only a single pub function, we reduce this to one.
pub Top: ast::Mod = {
StartModule <body:Program> => ast::Mod::Module { body, type_ignores: vec![] },
StartInteractive <body:Program> => ast::Mod::Interactive { body },
StartExpression <body:TestList> ("\n")* => ast::Mod::Expression { body: Box::new(body) },
};
Program: ast::Suite = {
<lines:FileLine*> => {
lines.into_iter().flatten().collect()
},
};
// A file line either has a declaration, or an empty newline:
FileLine: ast::Suite = {
Statement,
"\n" => vec![],
};
Suite: ast::Suite = {
SimpleStatement,
"\n" Indent <s:Statement+> Dedent => s.into_iter().flatten().collect(),
};
Statement: ast::Suite = {
SimpleStatement,
<s:CompoundStatement> => vec![s],
};
SimpleStatement: ast::Suite = {
<s1:SmallStatement> <s2:(";" SmallStatement)*> ";"? "\n" => {
let mut statements = vec![s1];
statements.extend(s2.into_iter().map(|e| e.1));
statements
}
};
SmallStatement: ast::Stmt = {
ExpressionStatement,
PassStatement,
DelStatement,
FlowStatement,
ImportStatement,
GlobalStatement,
NonlocalStatement,
AssertStatement,
};
PassStatement: ast::Stmt = {
<location:@L> "pass" => {
ast::Stmt {
location,
custom: (),
node: ast::StmtKind::Pass,
}
},
};
DelStatement: ast::Stmt = {
<location:@L> "del" <targets:ExpressionList2> => {
ast::Stmt {
location,
custom: (),
node: ast::StmtKind::Delete { targets },
}
},
};
ExpressionStatement: ast::Stmt = {
<location:@L> <expression:TestOrStarExprList> <suffix:AssignSuffix*> => {
// Just an expression, no assignment:
if suffix.is_empty() {
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::Expr { value: Box::new(expression) }
}
} else {
let mut targets = vec![expression];
let mut values = suffix;
while values.len() > 1 {
targets.push(values.remove(0));
}
let value = Box::new(values.into_iter().next().unwrap());
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::Assign { targets, value, type_comment: None },
}
}
},
<location:@L> <target:TestOrStarExprList> <op:AugAssign> <rhs:TestListOrYieldExpr> => {
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::AugAssign {
target: Box::new(target),
op,
value: Box::new(rhs)
},
}
},
<location:@L> <target:Test> ":" <annotation:Test> <rhs:AssignSuffix?> => {
let simple = matches!(target.node, ast::ExprKind::Name { .. });
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::AnnAssign {
target: Box::new(target),
annotation: Box::new(annotation),
value: rhs.map(Box::new),
simple,
},
}
},
};
AssignSuffix: ast::Expr = {
"=" <e:TestListOrYieldExpr> => e
};
TestListOrYieldExpr: ast::Expr = {
TestList,
YieldExpr
}
#[inline]
TestOrStarExprList: ast::Expr = {
// as far as I can tell, these were the same
TestList
};
TestOrStarNamedExprList: ast::Expr = {
GenericList<TestOrStarNamedExpr>
};
TestOrStarExpr: ast::Expr = {
Test,
StarExpr,
};
TestOrStarNamedExpr: ast::Expr = {
NamedExpressionTest,
StarExpr,
};
AugAssign: ast::Operator = {
"+=" => ast::Operator::Add,
"-=" => ast::Operator::Sub,
"*=" => ast::Operator::Mult,
"@=" => ast::Operator::MatMult,
"/=" => ast::Operator::Div,
"%=" => ast::Operator::Mod,
"&=" => ast::Operator::BitAnd,
"|=" => ast::Operator::BitOr,
"^=" => ast::Operator::BitXor,
"<<=" => ast::Operator::LShift,
">>=" => ast::Operator::RShift,
"**=" => ast::Operator::Pow,
"//=" => ast::Operator::FloorDiv,
};
FlowStatement: ast::Stmt = {
<location:@L> "break" => {
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::Break,
}
},
<location:@L> "continue" => {
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::Continue,
}
},
<location:@L> "return" <value:TestList?> => {
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::Return { value: value.map(Box::new) },
}
},
<location:@L> <expression:YieldExpr> => {
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::Expr { value: Box::new(expression) },
}
},
RaiseStatement,
};
RaiseStatement: ast::Stmt = {
<location:@L> "raise" => {
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::Raise { exc: None, cause: None },
}
},
<location:@L> "raise" <t:Test> <c:("from" Test)?> => {
ast::Stmt {
custom: (),
location,
node: ast::StmtKind:
6D40
:Raise { exc: Some(Box::new(t)), cause: c.map(|x| Box::new(x.1)) },
}
},
};
ImportStatement: ast::Stmt = {
<location:@L> "import" <names: OneOrMore<ImportAsAlias<DottedName>>> => {
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::Import { names },
}
},
<location:@L> "from" <source:ImportFromLocation> "import" <names: ImportAsNames> => {
let (level, module) = source;
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::ImportFrom {
level,
module,
names
},
}
},
};
ImportFromLocation: (usize, Option<String>) = {
<dots: ImportDots*> <name:DottedName> => {
(dots.iter().sum(), Some(name))
},
<dots: ImportDots+> => {
(dots.iter().sum(), None)
},
};
ImportDots: usize = {
"..." => 3,
"." => 1,
};
ImportAsNames: Vec<ast::Alias> = {
<i:OneOrMore<ImportAsAlias<Identifier>>> => i,
"(" <i:OneOrMore<ImportAsAlias<Identifier>>> ","? ")" => i,
"*" => {
// Star import all
vec![ast::Alias { name: "*".to_string(), asname: None }]
},
};
#[inline]
ImportAsAlias<I>: ast::Alias = {
<name:I> <a: ("as" Identifier)?> => ast::Alias { name, asname: a.map(|a| a.1) },
};
// A name like abc or abc.def.ghi
DottedName: String = {
<n:name> => n,
<n:name> <n2: ("." Identifier)+> => {
let mut r = n.to_string();
for x in n2 {
r.push_str(".");
r.push_str(&x.1);
}
r
},
};
GlobalStatement: ast::Stmt = {
<location:@L> "global" <names:OneOrMore<Identifier>> => {
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::Global { names }
}
},
};
NonlocalStatement: ast::Stmt = {
<location:@L> "nonlocal" <names:OneOrMore<Identifier>> => {
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::Nonlocal { names }
}
},
};
AssertStatement: ast::Stmt = {
<location:@L> "assert" <test:Test> <msg: ("," Test)?> => {
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::Assert {
test: Box::new(test),
msg: msg.map(|e| Box::new(e.1))
}
}
},
};
CompoundStatement: ast::Stmt = {
IfStatement,
WhileStatement,
ForStatement,
TryStatement,
WithStatement,
FuncDef,
ClassDef,
};
IfStatement: ast::Stmt = {
<location:@L> "if" <test:NamedExpressionTest> ":" <body:Suite> <s2:(@L "elif" NamedExpressionTest ":" Suite)*> <s3:("else" ":" Suite)?> => {
// Determine last else:
let mut last = s3.map(|s| s.2).unwrap_or_default();
// handle elif:
for i in s2.into_iter().rev() {
let x = ast::Stmt {
custom: (),
location: i.0,
node: ast::StmtKind::If { test: Box::new(i.2), body: i.4, orelse: last },
};
last = vec![x];
}
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::If { test: Box::new(test), body, orelse: last }
}
},
};
WhileStatement: ast::Stmt = {
<location:@L> "while" <test:NamedExpressionTest> ":" <body:Suite> <s2:("else" ":" Suite)?> => {
let orelse = s2.map(|s| s.2).unwrap_or_default();
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::While {
test: Box::new(test),
body,
orelse
},
}
},
};
ForStatement: ast::Stmt = {
<location:@L> <is_async:"async"?> "for" <target:ExpressionList> "in" <iter:TestList> ":" <body:Suite> <s2:("else" ":" Suite)?> => {
let orelse = s2.map(|s| s.2).unwrap_or_default();
let target = Box::new(target);
let iter = Box::new(iter);
let type_comment = None;
let node = if is_async.is_some() {
ast::StmtKind::AsyncFor { target, iter, body, orelse, type_comment }
} else {
ast::StmtKind::For { target, iter, body, orelse, type_comment }
};
ast::Stmt::new(location, node)
},
};
TryStatement: ast::Stmt = {
<location:@L> "try" ":" <body:Suite> <handlers:ExceptClause+> <else_suite:("else" ":" Suite)?> <finally:("finally" ":" Suite)?> => {
let orelse = else_suite.map(|s| s.2).unwrap_or_default();
let finalbody = finally.map(|s| s.2).unwrap_or_default();
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::Try {
body,
handlers,
orelse,
finalbody,
},
}
},
<location:@L> "try" ":" <body:Suite> <finally:("finally" ":" Suite)> => {
let handlers = vec![];
let orelse = vec![];
let finalbody = finally.2;
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::Try {
body,
handlers,
orelse,
finalbody,
},
}
},
};
ExceptClause: ast::Excepthandler = {
<location:@L> "except" <typ:Test?> ":" <body:Suite> => {
ast::Excepthandler::new(
location,
ast::ExcepthandlerKind::ExceptHandler {
type_: typ.map(Box::new),
name: None,
body,
},
)
},
<location:@L> "except" <x:(Test "as" Identifier)> ":" <body:Suite> => {
ast::Excepthandler::new(
location,
ast::ExcepthandlerKind::ExceptHandler {
type_: Some(Box::new(x.0)),
name: Some(x.2),
body,
},
)
},
};
WithStatement: ast::Stmt = {
<location:@L> <is_async:"async"?> "with" <items:OneOrMore<WithItem>> ":" <body:Suite> => {
let type_comment = None;
let node = if is_async.is_some() {
ast::StmtKind::AsyncWith { items, body, type_comment }
} else {
ast::StmtKind::With { items, body, type_comment }
};
ast::Stmt::new(location, node)
},
};
WithItem: ast::Withitem = {
<context_expr:Test> <n:("as" Expression)?> => {
let optional_vars = n.map(|val| Box::new(val.1));
let context_expr = Box::new(context_expr);
ast::Withitem { context_expr, optional_vars }
},
};
FuncDef: ast::Stmt = {
<decorator_list:Decorator*> <location:@L> <is_async:"async"?> "def" <name:Identifier> <args:Parameters> <r:("->" Test)?> ":" <body:Suite> => {
let args = Box::new(args);
let returns = r.map(|x| Box::new(x.1));
let type_comment = None;
let node = if is_async.is_some() {
ast::StmtKind::AsyncFunctionDef { name, args, body, decorator_list, returns, type_comment }
} else {
ast::StmtKind::FunctionDef { name, args, body, decorator_list, returns, type_comment }
};
ast::Stmt::new(location, node)
},
};
Parameters: ast::Arguments = {
"(" <a: (ParameterList<TypedParameter>)?> ")" => {
a.unwrap_or_else(|| ast::Arguments {
posonlyargs: vec![],
args: vec![],
vararg: None,
kwonlyargs: vec![],
kw_defaults: vec![],
kwarg: None,
defaults: vec![]
})
}
};
// Note that this is a macro which is used once for function defs, and
// once for lambda defs.
ParameterList<ArgType>: ast::Arguments = {
<param1:ParameterDefs<ArgType>> <args2:("," ParameterListStarArgs<ArgType>)?> ","? =>? {
let (posonlyargs, args, defaults) = parse_params(param1)?;
// Now gather rest of parameters:
let (vararg, kwonlyargs, kw_defaults, kwarg) = args2.map_or((None, vec![], vec![], None), |x| x.1);
Ok(ast::Arguments {
posonlyargs,
args,
kwonlyargs,
vararg,
kwarg,
defaults,
kw_defaults,
})
},
<param1:ParameterDefs<ArgType>> <kw:("," KwargParameter<ArgType>)> ","? =>? {
let (posonlyargs, args, defaults) = parse_params(param1)?;
// Now gather rest of parameters:
let vararg = None;
let kwonlyargs = vec![];
let kw_defaults = vec![];
let kwarg = kw.1;
Ok(ast::Arguments {
posonlyargs,
args,
kwonlyargs,
vararg,
kwarg,
defaults,
kw_defaults,
})
},
<params:ParameterListStarArgs<ArgType>> ","? => {
let (vararg, kwonlyargs, kw_defaults, kwarg) = params;
ast::Arguments {
posonlyargs: vec![],
args: vec![],
kwonlyargs,
vararg,
kwarg,
defaults: vec![],
kw_defaults,
}
},
<kwarg:KwargParameter<ArgType>> ","? => {
ast::Arguments {
posonlyargs: vec![],
args: vec![],
kwonlyargs: vec![],
vararg: None,
kwarg,
defaults: vec![],
kw_defaults: vec![],
}
},
};
// Use inline here to make sure the "," is not creating an ambiguity.
#[inline]
ParameterDefs<ArgType>: (Vec<(ast::Arg, Option<ast::Expr>)>, Vec<(ast::Arg, Option<ast::Expr>)>) = {
<args:OneOrMore<ParameterDef<ArgType>>> => {
(vec![], args)
},
<pos_args:OneOrMore<ParameterDef<ArgType>>> "," "/" <args:("," ParameterDef<ArgType>)*> => {
(pos_args, args.into_iter().map(|e| e.1).collect())
},
};
ParameterDef<ArgType>: (ast::Arg, Option<ast::Expr>) = {
<i:ArgType> => (i, None),
<i:ArgType> "=" <e:Test> => (i, Some(e)),
};
UntypedParameter: ast::Arg = {
<location:@L> <arg:Identifier> => ast::Arg::new(
location,
ast::ArgData { arg, annotation: None, type_comment: None },
),
};
TypedParameter: ast::Arg = {
<location:@L> <arg:Identifier> <a:(":" Test)?>=> {
let annotation = a.map(|x| Box::new(x.1));
ast::Arg::new(location, ast::ArgData { arg, annotation, type_comment: None })
},
};
// Use inline here to make sure the "," is not creating an ambiguity.
// TODO: figure out another grammar that makes this inline no longer required.
#[inline]
ParameterListStarArgs<ArgType>: (Option<Box<ast::Arg>>, Vec<ast::Arg>, Vec<Option<Box<ast::Expr>>>, Option<Box<ast::Arg>>) = {
"*" <va:ArgType?> <kw:("," ParameterDef<ArgType>)*> <kwarg:("," KwargParameter<ArgType>)?> => {
// Extract keyword arguments:
let mut kwonlyargs = vec![];
let mut kw_defaults = vec![];
for (name, value) in kw.into_iter().map(|x| x.1) {
kwonlyargs.push(name);
kw_defaults.push(value.map(Box::new));
}
let kwarg = kwarg.map(|n| n.1).flatten();
let va = va.map(Box::new);
(va, kwonlyargs, kw_defaults, kwarg)
}
};
KwargParameter<ArgType>: Option<Box<ast::Arg>> = {
"**" <kwarg:ArgType?> => {
kwarg.map(Box::new)
}
};
ClassDef: ast::Stmt = {
<decorator_list:Decorator*> <location:@L> "class" <name:Identifier> <a:("(" ArgumentList ")")?> ":" <body:Suite> => {
let (bases, keywords) = match a {
Some((_, arg, _)) => (arg.args, arg.keywords),
None => (vec![], vec![]),
};
ast::Stmt {
custom: (),
location,
node: ast::StmtKind::ClassDef {
name,
bases,
keywords,
body,
decorator_list,
},
}
},
};
// Decorators:
Decorator: ast::Expr = {
<location:@L>"@" <p:Test> "\n" => {
p
},
};
YieldExpr: ast::Expr = {
<location:@L> "yield" <value:TestList?> => ast::Expr {
location,
custom: (),
node: ast::ExprKind::Yield { value: value.map(Box::new) }
},
<location:@L> "yield" "from" <e:Test> => ast::Expr {
location,
custom: (),
node: ast::ExprKind::YieldFrom { value: Box::new(e) }
},
};
Test: ast::Expr = {
<expr:OrTest> <condition: (@L "if" OrTest "else" Test)?> => {
if let Some(c) = condition {
ast::Expr {
location: c.0,
custom: (),
node: ast::ExprKind::IfExp {
test: Box::new(c.2),
body: Box::new(expr),
orelse: Box::new(c.4),
}
}
} else {
expr
}
},
LambdaDef,
};
NamedExpressionTest: ast::Expr = {
<location:@L><left: (Identifier ":=")?> <right:Test> => {
if let Some(l) = left {
ast::Expr {
location: location,
custom: (),
node: ast::ExprKind::NamedExpr {
target: Box::new(ast::Expr::new(
location,
ast::ExprKind::Name { id: l.0, ctx: ast::ExprContext::Store },
)),
value: Box::new(right),
}
}
} else {
right
}
}
}
LambdaDef: ast::Expr = {
<location:@L> "lambda" <p:ParameterList<UntypedParameter>?> ":" <body:Test> => {
let p = p.unwrap_or_else(|| {
ast::Arguments {
posonlyargs: vec![],
args: vec![],
vararg: None,
kwonlyargs: vec![],
kw_defaults: vec![],
kwarg: None,
defaults: vec![]
}
});
ast::Expr {
location,
custom: (),
node: ast::ExprKind::Lambda {
args: Box::new(p),
body: Box::new(body)
}
}
}
}
OrTest: ast::Expr = {
<e1:AndTest> <location:@L> <e2:("or" AndTest)*> => {
if e2.is_empty() {
e1
} else {
let mut values = vec![e1];
values.extend(e2.into_iter().map(|e| e.1));
ast::Expr {
location,
custom: (),
node: ast::ExprKind::BoolOp { op: ast::Boolop::Or, values }
}
}
},
};
AndTest: ast::Expr = {
<e1:NotTest> <location:@L> <e2:("and" NotTest)*> => {
if e2.is_empty() {
e1
} else {
let mut values = vec![e1];
values.extend(e2.into_iter().map(|e| e.1));
ast::Expr {
location,
custom: (),
node: ast::ExprKind::BoolOp { op: ast::Boolop::And, values }
}
}
},
};
NotTest: ast::Expr = {
<location:@L> "not" <e:NotTest> => ast::Expr {
location,
custom: (),
node: ast::ExprKind::UnaryOp { operand: Box::new(e), op: ast::Unaryop::Not }
},
Comparison,
};
Comparison: ast::Expr = {
<left:Expression> <location:@L> <comparisons:(CompOp Expression)+> => {
let (ops, comparators) = comparisons.into_iter().unzip();
ast::Expr {
location,
custom: (),
node: ast::ExprKind::Compare { left: Box::new(left), ops, comparators }
}
},
Expression,
};
CompOp: ast::Cmpop = {
"==" => ast::Cmpop::Eq,
"!=" => ast::Cmpop::NotEq,
"<" => ast::Cmpop::Lt,
"<=" => ast::Cmpop::LtE,
">" => ast::Cmpop::Gt,
">=" => ast::Cmpop::GtE,
"in" => ast::Cmpop::In,
"not" "in" => ast::Cmpop::NotIn,
"is" => ast::Cmpop::Is,
"is" "not" => ast::Cmpop::IsNot,
};
Expression: ast::Expr = {
<e1:Expression> <location:@L> "|" <e2:XorExpression> => ast::Expr {
location,
custom: (),
node: ast::ExprKind::BinOp { left: Box::new(e1), op: ast::Operator::BitOr, right: Box::new(e2) }
},
XorExpression,
};
XorExpression: ast::Expr = {
<e1:XorExpression> <location:@L> "^" <e2:AndExpression> => ast::Expr {
location,
custom: (),
node: ast::ExprKind::BinOp { left: Box::new(e1), op: ast::Operator::BitXor, right: Box::new(e2) }
},
AndExpression,
};
AndExpression: ast::Expr = {
<e1:AndExpression> <location:@L> "&" <e2:ShiftExpression> => ast::Expr {
location,
custom: (),
node: ast::ExprKind::BinOp { left: Box::new(e1), op: ast::Operator::BitAnd, right: Box::new(e2) }
},
ShiftExpression,
};
ShiftExpression: ast::Expr = {
<e1:ShiftExpression> <location:@L> <op:ShiftOp> <e2:ArithmaticExpression> => ast::Expr {
location,
custom: (),
node: ast::ExprKind::BinOp { left: Box::new(e1), op, right: Box::new(e2) }
},
ArithmaticExpression,
};
ShiftOp: ast::Operator = {
"<<" => ast::Operator::LShift,
">>" => ast::Operator::RShift,
};
ArithmaticExpression: ast::Expr = {
<a:ArithmaticExpression> <location:@L> <op:AddOp> <b:Term> => ast::Expr {
location,
custom: (),
node: ast::ExprKind::BinOp { left: Box::new(a), op, right: Box::new(b) }
},
Term,
};
AddOp: ast::Operator = {
"+" => ast::Operator::Add,
"-" => ast::Operator::Sub,
};
Term: ast::Expr = {
<a:Term> <location:@L> <op:MulOp> <b:Factor> => ast::Expr {
location,
custom: (),
node: ast::ExprKind::BinOp { left: Box::new(a), op, right: Box::new(b) }
},
Factor,
};
MulOp: ast::Operator = {
"*" => ast::Operator::Mult,
"/" => ast::Operator::Div,
"//" => ast::Operator::FloorDiv,
"%" => ast::Operator::Mod,
"@" => ast::Operator::MatMult,
};
Factor: ast::Expr = {
<location:@L> <op:UnaryOp> <e:Factor> => ast::Expr {
location,
custom: (),
node: ast::ExprKind::UnaryOp { operand: Box::new(e), op }
},
Power,
};
UnaryOp: ast::Unaryop = {
"+" => ast::Unaryop::UAdd,
"-" => ast::Unaryop::USub,
"~" => ast::Unaryop::Invert,
};
Power: ast::Expr = {
<e:AtomExpr> <e2:(@L "**" Factor)?> => {
match e2 {
None => e,
Some((location, _, b)) => ast::Expr {
location,
custom: (),
node: ast::ExprKind::BinOp { left: Box::new(e), op: ast::Operator::Pow, right: Box::new(b) }
},
}
}
};
AtomExpr: ast::Expr = {
<location:@L> <is_await:"await"?> <atom:AtomExpr2> => {
if is_await.is_some() {
ast::Expr {
location,
custom: (),
node: ast::ExprKind::Await { value: Box::new(atom) }
}
} else {
atom
}
}
}
AtomExpr2: ast::Expr = {
Atom,
<f:AtomExpr2> <location:@L> "(" <a:ArgumentList> ")" => {
ast::Expr {
location,
custom: (),
node: ast::ExprKind::Call { func: Box::new(f), args: a.args, keywords: a.keywords }
}
},
<e:AtomExpr2> <location:@L> "[" <s:SubscriptList> "]" => ast::Expr {
location,
custom: (),
node: ast::ExprKind::Subscript { value: Box::new(e), slice: Box::new(s), ctx: ast::ExprContext::Load }
},
<e:AtomExpr2> <location:@L> "." <attr:Identifier> => ast::Expr {
location,
custom: (),
node: ast::ExprKind::Attribute { value: Box::new(e), attr, ctx: ast::ExprContext::Load }
},
};
SubscriptList: ast::Expr = {
<location:@L> <s1:Subscript> <s2:("," Subscript)*> ","? => {
if s2.is_empty() {
s1
} else {
let mut dims = vec![s1];
for x in s2 {
dims.push(x.1)
}
ast::Expr {
location,
custom: (),
node: ast::ExprKind::Tuple { elts: dims, ctx: ast::ExprContext::Load },
}
}
}
};
Subscript: ast::Expr = {
Test,
<e1:Test?> <location:@L> ":" <e2:Test?> <e3:SliceOp?> => {
let lower = e1.map(Box::new);
let upper = e2.map(Box::new);
let step = e3.flatten().map(Box::new);
ast::Expr {
location,
custom: (),
node: ast::ExprKind::Slice { lower, upper, step }
}
}
};
SliceOp: Option<ast::Expr> = {
<location:@L> ":" <e:Test?> => e,
}
Atom: ast::Expr = {
<location:@L> <s:(@L string)+> =>? {
let values = s.into_iter().map(|(loc, (value, is_fstring))| {
if is_fstring {
parse_located_fstring(&value, loc)
} else {
Ok(ast::Expr::new(
loc,
ast::ExprKind::Constant { value: value.into(), kind: None },
))
}
});
let values = values.collect::<Result<Vec<_>, _>>()?;
Ok(if values.len() > 1 {
ast::Expr::new(location, ast::ExprKind::JoinedStr { values })
} else {
values.into_iter().next().unwrap()
})
},
<location:@L> <value:Constant> => ast::Expr {
location,
custom: (),
node: ast::ExprKind::Constant { value, kind: None }
},
<location:@L> <name:Identifier> => ast::Expr {
location,
custom: (),
node: ast::ExprKind::Name { id: name, ctx: ast::ExprContext::Load }
},
<location:@L> "[" <e:ListLiteralValues?> "]" => {
let elts = e.unwrap_or_default();
ast::Expr {
location,
custom: (),
node: ast::ExprKind::List { elts, ctx: ast::ExprContext::Load }
}
},
<location:@L> "[" <elt:TestOrStarNamedExpr> <generators:CompFor> "]" => {
ast::Expr {
location,
custom: (),
node: ast::ExprKind::ListComp { elt: Box::new(elt), generators }
}