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python.lalrpop
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1222 lines (1110 loc) · 35.3 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::{parse_args, parse_params};
use crate::error::LexicalError;
use crate::lexer;
use crate::location;
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::Top = {
StartProgram <p:Program> => ast::Top::Program(p),
StartStatement <s:Statement> => ast::Top::Statement(s),
StartExpression <e:Test> ("\n")* => ast::Top::Expression(e),
};
Program: ast::Program = {
<lines:FileLine*> => ast::Program {
statements: Vec::from_iter(lines.into_iter().flatten())
},
};
// 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::Statement = {
ExpressionStatement,
PassStatement,
DelStatement,
FlowStatement,
ImportStatement,
GlobalStatement,
NonlocalStatement,
AssertStatement,
};
PassStatement: ast::Statement = {
<location:@L> "pass" => {
ast::Statement {
location,
node: ast::StatementType::Pass,
}
},
};
DelStatement: ast::Statement = {
<location:@L> "del" <targets:ExpressionList2> => {
ast::Statement {
location,
node: ast::StatementType::Delete { targets },
}
},
};
ExpressionStatement: ast::Statement = {
<location:@L> <expression:TestOrStarExprList> <suffix:AssignSuffix*> => {
// Just an expression, no assignment:
if suffix.is_empty() {
ast::Statement {
location,
node: ast::StatementType::Expression { expression }
}
} else {
let mut targets = vec![expression];
let mut values = suffix;
while values.len() > 1 {
targets.push(values.remove(0));
}
let value = values.into_iter().next().unwrap();
ast::Statement {
location,
node: ast::StatementType::Assign { targets, value },
}
}
},
<location:@L> <target:TestOrStarExprList> <op:AugAssign> <rhs:TestList> => {
ast::Statement {
location,
node: ast::StatementType::AugAssign {
target: Box::new(target),
op,
value: Box::new(rhs)
},
}
},
<location:@L> <target:Test> ":" <annotation:Test> <rhs:("=" Test)?> => {
ast::Statement {
location,
node: ast::StatementType::AnnAssign {
target: Box::new(target),
annotation: Box::new(annotation),
value: rhs.map(|e| e.1)
},
}
},
};
AssignSuffix: ast::Expression = {
"=" <e:TestList> => e,
"=" <e:YieldExpr> => e,
};
TestOrStarExprList: ast::Expression = {
<location:@L> <elements:OneOrMore<TestOrStarExpr>> <comma:","?> => {
if elements.len() == 1 && comma.is_none() {
elements.into_iter().next().unwrap()
} else {
ast::Expression {
location,
node: ast::ExpressionType::Tuple { elements }
}
}
}
};
TestOrStarExpr: ast::Expression = {
Test,
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::Statement = {
<location:@L> "break" => {
ast::Statement {
location,
node: ast::StatementType::Break,
}
},
<location:@L> "continue" => {
ast::Statement {
location,
node: ast::StatementType::Continue,
}
},
<location:@L> "return" <value:TestList?> => {
ast::Statement {
location,
node: ast::StatementType::Return { value },
}
},
<location:@L> <expression:YieldExpr> => {
ast::Statement {
location,
node: ast::StatementType::Expression { expression },
}
},
RaiseStatement,
};
RaiseStatement: ast::Statement = {
<location:@L> "raise" => {
ast::Statement {
location,
node: ast::StatementType::Raise { exception: None, cause: None },
}
},
<location:@L> "raise" <t:Test> <c:("from" Test)?> => {
ast::Statement {
location,
node: ast::StatementType::Raise { exception: Some(t), cause: c.map(|x| x.1) },
}
},
};
ImportStatement: ast::Statement = {
<location:@L> "import" <names: OneOrMore<ImportAsAlias<DottedName>>> => {
ast::Statement {
location,
node: ast::StatementType::Import { names },
}
},
<location:@L> "from" <source:ImportFromLocation> "import" <names: ImportAsNames> => {
let (level, module) = source;
ast::Statement {
location,
node: ast::StatementType::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::ImportSymbol> = {
<i:OneOrMore<ImportAsAlias<Identifier>>> => i,
"(" <i:OneOrMore<ImportAsAlias<Identifier>>> ","? ")" => i,
"*" => {
// Star import all
vec![ast::ImportSymbol { symbol: "*".to_string(), alias: None }]
},
};
#[inline]
ImportAsAlias<I>: ast::ImportSymbol = {
<symbol:I> <a: ("as" Identifier)?> => ast::ImportSymbol { symbol, alias: 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::Statement = {
<location:@L> "global" <names:OneOrMore<Identifier>> => {
ast::Statement {
location,
node: ast::StatementType::Global { names }
}
},
};
NonlocalStatement: ast::Statement = {
<location:@L> "nonlocal" <names:OneOrMore<Identifier>> => {
ast::Statement {
location,
node: ast::StatementType::Nonlocal { names }
}
},
};
AssertStatement: ast::Statement = {
<location:@L> "assert" <test:Test> <msg: ("," Test)?> => {
ast::Statement {
location,
node: ast::StatementType::Assert {
test, msg: msg.map(|e| e.1)
}
}
},
};
CompoundStatement: ast::Statement = {
IfStatement,
WhileStatement,
ForStatement,
TryStatement,
WithStatement,
FuncDef,
ClassDef,
};
IfStatement: ast::Statement = {
<location:@L> "if" <test:Test> ":" <body:Suite> <s2:(@L "elif" Test ":" Suite)*> <s3:("else" ":" Suite)?> => {
// Determine last else:
let mut last = s3.map(|s| s.2);
// handle elif:
for i in s2.into_iter().rev() {
let x = ast::Statement {
location: i.0,
node: ast::StatementType::If { test: i.2, body: i.4, orelse: last },
};
last = Some(vec![x]);
}
ast::Statement {
location,
node: ast::StatementType::If { test, body, orelse: last }
}
},
};
WhileStatement: ast::Statement = {
<location:@L> "while" <test:Test> ":" <body:Suite> <s2:("else" ":" Suite)?> => {
let orelse = s2.map(|s| s.2);
ast::Statement {
location,
node: ast::StatementType::While {
test,
body,
orelse
},
}
},
};
ForStatement: ast::Statement = {
<location:@L> <is_async:"async"?> "for" <target:ExpressionList> "in" <iter:TestList> ":" <body:Suite> <s2:("else" ":" Suite)?> => {
let is_async = is_async.is_some();
let orelse = s2.map(|s| s.2);
ast::Statement {
location,
node: ast::StatementType::For {
is_async,
target: Box::new(target),
iter: Box::new(iter),
body,
orelse
},
}
},
};
TryStatement: ast::Statement = {
<location:@L> "try" ":" <body:Suite> <handlers:ExceptClause+> <else_suite:("else" ":" Suite)?> <finally:("finally" ":" Suite)?> => {
let orelse = else_suite.map(|s| s.2);
let finalbody = finally.map(|s| s.2);
ast::Statement {
location,
node: ast::StatementType::Try {
body,
handlers,
orelse,
finalbody,
},
}
},
<location:@L> "try" ":" <body:Suite> <finally:("finally" ":" Suite)> => {
let handlers = vec![];
let orelse = None;
let finalbody = Some(finally.2);
ast::Statement {
location,
node: ast::StatementType::Try {
body,
handlers,
orelse,
finalbody,
},
}
},
};
ExceptClause: ast::ExceptHandler = {
<location:@L> "except" <typ:Test?> ":" <body:Suite> => {
ast::ExceptHandler {
location,
typ,
name: None,
body,
}
},
<location:@L> "except" <x:(Test "as" Identifier)> ":" <body:Suite> => {
ast::ExceptHandler {
location,
typ: Some(x.0),
name: Some(x.2),
body,
}
},
};
WithStatement: ast::Statement = {
<location:@L> <is_async:"async"?> "with" <items:OneOrMore<WithItem>> ":" <body:Suite> => {
let is_async = is_async.is_some();
ast::Statement {
location,
node: ast::StatementType::With { is_async, items, body },
}
},
};
WithItem: ast::WithItem = {
<context_expr:Test> <n:("as" Expression)?> => {
let optional_vars = n.map(|val| val.1);
ast::WithItem { context_expr, optional_vars }
},
};
FuncDef: ast::Statement = {
<decorator_list:Decorator*> <location:@L> <is_async:"async"?> "def" <name:Identifier> <args:Parameters> <r:("->" Test)?> ":" <body:Suite> => {
let is_async = is_async.is_some();
ast::Statement {
location,
node: ast::StatementType::FunctionDef {
is_async,
name,
args: Box::new(args),
body,
decorator_list,
returns: r.map(|x| x.1),
}
}
},
};
Parameters: ast::Parameters = {
"(" <a: (ParameterList<TypedParameter>)?> ")" => a.unwrap_or_default(),
};
// Note that this is a macro which is used once for function defs, and
// once for lambda defs.
ParameterList<ArgType>: ast::Parameters = {
<param1:ParameterDefs<ArgType>> <args2:("," ParameterListStarArgs<ArgType>)?> ","? =>? {
let (names, default_elements) = 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::Parameters {
args: names,
kwonlyargs,
vararg: vararg.into(),
kwarg: kwarg.into(),
defaults: default_elements,
kw_defaults: kw_defaults,
})
},
<param1:ParameterDefs<ArgType>> <kw:("," KwargParameter<ArgType>)> ","? =>? {
let (names, default_elements) = parse_params(param1)?;
// Now gather rest of parameters:
let vararg = None;
let kwonlyargs = vec![];
let kw_defaults = vec![];
let kwarg = Some(kw.1);
Ok(ast::Parameters {
args: names,
kwonlyargs,
vararg: vararg.into(),
kwarg: kwarg.into(),
defaults: default_elements,
kw_defaults: kw_defaults,
})
},
<params:ParameterListStarArgs<ArgType>> ","? => {
let (vararg, kwonlyargs, kw_defaults, kwarg) = params;
ast::Parameters {
args: vec![],
kwonlyargs,
vararg: vararg.into(),
kwarg: kwarg.into(),
defaults: vec![],
kw_defaults: kw_defaults,
}
},
<kw:KwargParameter<ArgType>> ","? => {
ast::Parameters {
args: vec![],
kwonlyargs: vec![],
vararg: ast::Varargs::None,
kwarg: Some(kw).into(),
defaults: vec![],
kw_defaults: vec![],
}
},
};
// Use inline here to make sure the "," is not creating an ambiguity.
#[inline]
ParameterDefs<ArgType>: Vec<(ast::Parameter, Option<ast::Expression>)> = {
<args:OneOrMore<ParameterDef<ArgType>>> => {
args
}
};
ParameterDef<ArgType>: (ast::Parameter, Option<ast::Expression>) = {
<i:ArgType> => (i, None),
<i:ArgType> "=" <e:Test> => (i, Some(e)),
};
UntypedParameter: ast::Parameter = {
<location:@L> <arg:Identifier> => ast::Parameter { location, arg, annotation: None },
};
TypedParameter: ast::Parameter = {
<location:@L> <arg:Identifier> <a:(":" Test)?>=> {
let annotation = a.map(|x| Box::new(x.1));
ast::Parameter { location, arg, annotation }
},
};
// 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<Option<ast::Parameter>>, Vec<ast::Parameter>, Vec<Option<ast::Expression>>, Option<Option<ast::Parameter>>) = {
"*" <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);
}
let kwarg = kwarg.map(|n| n.1);
(Some(va), kwonlyargs, kw_defaults, kwarg)
}
};
KwargParameter<ArgType>: Option<ast::Parameter> = {
"**" <kwarg:ArgType?> => {
kwarg
}
};
ClassDef: ast::Statement = {
<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::Statement {
location,
node: ast::StatementType::ClassDef {
name,
bases,
keywords,
body,
decorator_list,
},
}
},
};
Path: ast::Expression = {
<location:@L> <n:Identifier> => ast::Expression {
location,
node: ast::ExpressionType::Identifier { name: n }
},
<p:Path> <location:@L> "." <n:name> => {
ast::Expression {
location,
node: ast::ExpressionType::Attribute {
value: Box::new(p),
name: n,
}
}
},
};
// Decorators:
Decorator: ast::Expression = {
"@" <p:Path> <a: (@L "(" ArgumentList ")")?> "\n" => {
match a {
Some((location, _, arg, _)) => {
ast::Expression {
location,
node: ast::ExpressionType::Call {
function: Box::new(p),
args: arg.args,
keywords: arg.keywords,
}
}
},
None => p,
}
},
};
YieldExpr: ast::Expression = {
<location:@L> "yield" <value:TestList?> => ast::Expression {
location,
node: ast::ExpressionType::Yield { value: value.map(Box::new) }
},
<location:@L> "yield" "from" <e:Test> => ast::Expression {
location,
node: ast::ExpressionType::YieldFrom { value: Box::new(e) }
},
};
Test: ast::Expression = {
<expr:OrTest> <condition: (@L "if" OrTest "else" Test)?> => {
if let Some(c) = condition {
ast::Expression {
location: c.0,
node: ast::ExpressionType::IfExpression {
test: Box::new(c.2),
body: Box::new(expr),
orelse: Box::new(c.4),
}
}
} else {
expr
}
},
LambdaDef,
};
LambdaDef: ast::Expression = {
<location:@L> "lam
C277
bda" <p:ParameterList<UntypedParameter>?> ":" <body:Test> =>
ast::Expression {
location,
node: ast::ExpressionType::Lambda {
args: Box::new(p.unwrap_or_default()),
body: Box::new(body)
}
}
}
OrTest: ast::Expression = {
<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::Expression {
location,
node: ast::ExpressionType::BoolOp { op: ast::BooleanOperator::Or, values }
}
}
},
};
AndTest: ast::Expression = {
<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::Expression {
location,
node: ast::ExpressionType::BoolOp { op: ast::BooleanOperator::And, values }
}
}
},
};
NotTest: ast::Expression = {
<location:@L> "not" <e:NotTest> => ast::Expression {
location,
node: ast::ExpressionType::Unop { a: Box::new(e), op: ast::UnaryOperator::Not }
},
Comparison,
};
Comparison: ast::Expression = {
<e:Expression> <location:@L> <comparisons:(CompOp Expression)+> => {
let mut vals = vec![e];
let mut ops = vec![];
for x in comparisons {
ops.push(x.0);
vals.push(x.1);
}
ast::Expression {
location,
node: ast::ExpressionType::Compare { vals, ops }
}
},
Expression,
};
CompOp: ast::Comparison = {
"==" => ast::Comparison::Equal,
"!=" => ast::Comparison::NotEqual,
"<" => ast::Comparison::Less,
"<=" => ast::Comparison::LessOrEqual,
">" => ast::Comparison::Greater,
">=" => ast::Comparison::GreaterOrEqual,
"in" => ast::Comparison::In,
"not" "in" => ast::Comparison::NotIn,
"is" => ast::Comparison::Is,
"is" "not" => ast::Comparison::IsNot,
};
Expression: ast::Expression = {
<e1:Expression> <location:@L> "|" <e2:XorExpression> => ast::Expression {
location,
node: ast::ExpressionType::Binop { a: Box::new(e1), op: ast::Operator::BitOr, b: Box::new(e2) }
},
XorExpression,
};
XorExpression: ast::Expression = {
<e1:XorExpression> <location:@L> "^" <e2:AndExpression> => ast::Expression {
location,
node: ast::ExpressionType::Binop { a: Box::new(e1), op: ast::Operator::BitXor, b: Box::new(e2) }
},
AndExpression,
};
AndExpression: ast::Expression = {
<e1:AndExpression> <location:@L> "&" <e2:ShiftExpression> => ast::Expression {
location,
node: ast::ExpressionType::Binop { a: Box::new(e1), op: ast::Operator::BitAnd, b: Box::new(e2) }
},
ShiftExpression,
};
ShiftExpression: ast::Expression = {
<e1:ShiftExpression> <location:@L> <op:ShiftOp> <e2:ArithmaticExpression> => ast::Expression {
location,
node: ast::ExpressionType::Binop { a: Box::new(e1), op, b: Box::new(e2) }
},
ArithmaticExpression,
};
ShiftOp: ast::Operator = {
"<<" => ast::Operator::LShift,
">>" => ast::Operator::RShift,
};
ArithmaticExpression: ast::Expression = {
<a:ArithmaticExpression> <location:@L> <op:AddOp> <b:Term> => ast::Expression {
location,
node: ast::ExpressionType::Binop { a: Box::new(a), op, b: Box::new(b) }
},
Term,
};
AddOp: ast::Operator = {
"+" => ast::Operator::Add,
"-" => ast::Operator::Sub,
};
Term: ast::Expression = {
<a:Term> <location:@L> <op:MulOp> <b:Factor> => ast::Expression {
location,
node: ast::ExpressionType::Binop { a: Box::new(a), op, b: Box::new(b) }
},
Factor,
};
MulOp: ast::Operator = {
"*" => ast::Operator::Mult,
"/" => ast::Operator::Div,
"//" => ast::Operator::FloorDiv,
"%" => ast::Operator::Mod,
"@" => ast::Operator::MatMult,
};
Factor: ast::Expression = {
<location:@L> <op:UnOp> <e:Factor> => ast::Expression {
location,
node: ast::ExpressionType::Unop { a: Box::new(e), op }
},
Power,
};
UnOp: ast::UnaryOperator = {
"+" => ast::UnaryOperator::Pos,
"-" => ast::UnaryOperator::Neg,
"~" => ast::UnaryOperator::Inv,
};
Power: ast::Expression = {
<e:AtomExpr> <e2:(@L "**" Factor)?> => {
match e2 {
None => e,
Some((location, _, b)) => ast::Expression {
location,
node: ast::ExpressionType::Binop { a: Box::new(e), op: ast::Operator::Pow, b: Box::new(b) }
},
}
}
};
AtomExpr: ast::Expression = {
<location:@L> <is_await:"await"?> <atom:AtomExpr2> => {
if is_await.is_some() {
ast::Expression {
location,
node: ast::ExpressionType::Await { value: Box::new(atom) }
}
} else {
atom
}
}
}
AtomExpr2: ast::Expression = {
Atom,
<f:AtomExpr2> <location:@L> "(" <a:ArgumentList> ")" => {
ast::Expression {
location,
node: ast::ExpressionType::Call { function: Box::new(f), args: a.args, keywords: a.keywords }
}
},
<e:AtomExpr2> <location:@L> "[" <s:SubscriptList> "]" => ast::Expression {
location,
node: ast::ExpressionType::Subscript { a: Box::new(e), b: Box::new(s) }
},
<e:AtomExpr2> <location:@L> "." <name:Identifier> => ast::Expression {
locat
4949
ion,
node: ast::ExpressionType::Attribute { value: Box::new(e), name }
},
};
SubscriptList: ast::Expression = {
<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::Expression {
location,
node: ast::ExpressionType::Tuple { elements: dims },
}
}
}
};
Subscript: ast::Expression = {
Test,
<e1:Test?> <location:@L> ":" <e2:Test?> <e3:SliceOp?> => {
let s1 = e1.unwrap_or(ast::Expression { location: location.clone(), node: ast::ExpressionType::None });
let s2 = e2.unwrap_or(ast::Expression { location: location.clone(), node: ast::ExpressionType::None });
let s3 = e3.unwrap_or(ast::Expression { location: location.clone(), node: ast::ExpressionType::None });
ast::Expression {
location,
node: ast::ExpressionType::Slice { elements: vec![s1, s2, s3] }
}
}
};
SliceOp: ast::Expression = {
<location:@L> ":" <e:Test?> => e.unwrap_or(ast::Expression {location, node: ast::ExpressionType::None})
}
Atom: ast::Expression = {
<location:@L> <value:StringGroup> => ast::Expression {
location,
node: ast::ExpressionType::String { value }
},
<location:@L> <value:Bytes> => ast::Expression {
location,
node: ast::ExpressionType::Bytes { value }
},
<location:@L> <value:Number> => ast::Expression {
location,
node: ast::ExpressionType::Number { value }
},
<location:@L> <name:Identifier> => ast::Expression {
location,
node: ast::ExpressionType::Identifier { name }
},
<location:@L> "[" <e:ListLiteralValues?> "]" => {
let elements = e.unwrap_or_default();
ast::Expression {
location,
node: ast::ExpressionType::List { elements }
}
},
<location:@L> "[" <element:TestOrStarExpr> <generators:CompFor> "]" => {
ast::Expression {
location,
node: ast::ExpressionType::Comprehension {
kind: Box::new(ast::ComprehensionKind::List { element }),
generators,
}
}
},
<location:@L> "(" <elements:TestOrStarExprList?> ")" => {
elements.unwrap_or(ast::Expression {
location,
node: ast::ExpressionType::Tuple { elements: Vec::new() }
})
},
"(" <e:YieldExpr> ")" => e,
<location:@L> "(" <element:Test> <generators:CompFor> ")" => {
ast::Expression {
location,
node: ast::ExpressionType::Comprehension {
kind: Box::new(ast::ComprehensionKind::GeneratorExpression { element }),
generators,
}
}
},
<location:@L> "{" <e:DictLiteralValues?> "}" => ast::Expression {
location,
node: ast::ExpressionType::Dict { elements: e.unwrap_or_default() }
},
<location:@L> "{" <e1:DictEntry> <generators:CompFor> "}" => {
ast::Expression {
location,
node: ast::ExpressionType::Comprehension {
kind: Box::new(ast::ComprehensionKind::Dict { key: e1.0, value: e1.1 }),
generators,
}
}
},
<location:@L> "{" <elements:SetLiteralValues> "}" => ast::Expression {
location,
node: ast::ExpressionType::Set { elements }
},
<location:@L> "{" <element:Test> <generators:CompFor> "}" => {
ast::Expression {
location,
node: ast::ExpressionType::Comprehension {
kind: Box::new(ast::ComprehensionKind::Set { element }),
generators,
}
}
},
<location:@L> "True" => ast::Expression { location, node: ast::ExpressionType::True },
<location:@L> "False" => ast::Expression { location, node: ast::ExpressionType::False },
<location:@L> "None" => ast::Expression { location, node: ast::ExpressionType::None },
<location:@L> "..." => ast::Expression { location, node: ast::ExpressionType::Ellipsis },
};
ListLiteralValues: Vec<ast::Expression> = {
<e:OneOrMore<TestOrStarExpr>> ","? => e,
};
DictLiteralValues: Vec<(Option<ast::Expression>, ast::Expression)> = {
<elements:OneOrMore<DictElement>> ","? => elements,
};
DictEntry: (ast::Expression, ast::Expression) = {
<e1: Test> ":" <e2: Test> => (e1, e2),
};
DictElement: (Option<ast::Expression>, ast::Expression) = {
<e:DictEntry> => (Some(e.0), e.1),
"**" <e:Expression> => (None, e),
};
SetLiteralValues: Vec<ast::Expression> = {
<e1:OneOrMore<TestOrStarExpr>> ","? => e1
};
ExpressionOrStarExpression = {
Expression,
StarExpr
};
ExpressionList: ast::Expression = {
<location:@L> <elements: OneOrMore<ExpressionOrStarExpression>> <trailing_comma:","?> => {
if elements.len() == 1 && trailing_comma.is_none() {
elements.into_iter().next().unwrap()
} else {
ast::Expression {
location,
node: ast::ExpressionType::Tuple { elements },
}
}
},
};