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python.lalrpop
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1105 lines (997 loc) · 30.7 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/lates
8000
t/nodes.html#keyword
#![allow(unknown_lints,clippy)]
use super::ast;
use super::lexer;
use std::iter::FromIterator;
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:Expression> => ast::Top::Expression(e),
};
Program: ast::Program = {
<lines:FileLine*> => ast::Program {
statements: Vec::from_iter(lines.into_iter().filter_map(|e| e))
},
};
// A file line either has a declaration, or an empty newline:
FileLine: Option<ast::LocatedStatement> = {
<s:Statement> => Some(s),
"\n" => None,
};
Suite: Vec<ast::LocatedStatement> = {
<s:SimpleStatement> => vec![s],
"\n" indent <s:Statement+> dedent => s,
};
Statement: ast::LocatedStatement = {
SimpleStatement,
CompoundStatement,
};
SimpleStatement: ast::LocatedStatement = {
<s:SmallStatement> "\n" => s,
<s:SmallStatement> ";" => s,
};
SmallStatement: ast::LocatedStatement = {
ExpressionStatement,
PassStatement,
DelStatement,
FlowStatement,
ImportStatement,
GlobalStatement,
NonlocalStatement,
AssertStatement,
};
PassStatement: ast::LocatedStatement = {
<loc:@L> "pass" => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::Pass,
}
},
};
DelStatement: ast::LocatedStatement = {
<loc:@L> "del" <e:ExpressionList2> => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::Delete { targets: e },
}
},
};
ExpressionStatement: ast::LocatedStatement = {
<loc:@L> <expr:TestOrStarExprList> <suffix:AssignSuffix*> => {
// Just an expression, no assignment:
if suffix.is_empty() {
ast::LocatedStatement {
location: loc.clone(),
node: ast::Statement::Expression { expression: expr }
}
} else {
let mut targets = vec![expr];
let mut values = suffix;
while values.len() > 1 {
targets.push(values.remove(0));
}
let value = values.into_iter().next().unwrap();
ast::LocatedStatement {
location: loc.clone(),
node: ast::Statement::Assign { targets, value },
}
}
},
<loc:@L> <expr:TestOrStarExprList> <op:AugAssign> <e2:TestList> => {
// TODO: this works in most cases:
let rhs = e2.into_iter().next().unwrap();
ast::LocatedStatement {
location: loc,
node: ast::Statement::AugAssign {
target: Box::new(expr),
op,
value: Box::new(rhs)
},
}
},
};
AssignSuffix: ast::Expression = {
"=" <e:TestList> => {
if e.len() > 1 {
ast::Expression::Tuple {
elements: e
}
} else {
e.into_iter().next().unwrap()
}
},
"=" <e:YieldExpr> => e,
};
TestOrStarExprList: ast::Expression = {
<e:TestOrStarExpr> <e2:("," TestOrStarExpr)*> <comma:","?> => {
let mut res = vec![e];
res.extend(e2.into_iter().map(|x| x.1));
// First build tuple from first item:
let expr = if (res.len() > 1) || comma.is_some() {
ast::Expression::Tuple { elements: res }
} else {
res.into_iter().next().unwrap()
};
expr
}
};
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::LocatedStatement = {
<loc:@L> "break" => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::Break,
}
},
<loc:@L> "continue" => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::Continue,
}
},
<loc:@L> "return" <t:TestList?> => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::Return { value: t },
}
},
<loc:@L> <y:YieldExpr> => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::Expression { expression: y },
}
},
RaiseStatement,
};
RaiseStatement: ast::LocatedStatement = {
<loc:@L> "raise" => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::Raise { exception: None, cause: None },
}
},
<loc:@L> "raise" <t:Test> <c:("from" Test)?> => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::Raise { exception: Some(t), cause: c.map(|x| x.1) },
}
},
};
ImportStatement: ast::LocatedStatement = {
<loc:@L> "import" <i: Comma<ImportPart<<DottedName>>>> => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::Import {
import_parts: i
.iter()
.map(|(n, a)|
ast::SingleImport {
module: n.to_string(),
symbol: None,
alias: a.clone()
})
.collect()
},
}
},
<loc:@L> "from" <n:ImportFromLocation> "import" <i: ImportAsNames> => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::Import {
import_parts: i
.iter()
.map(|(i, a)|
ast::SingleImport {
module: n.to_string(),
symbol: Some(i.to_string()),
alias: a.clone()
})
.collect()
},
}
},
};
ImportFromLocation: String = {
<dots: "."*> <name:DottedName> => {
let mut r = "".to_string();
for _dot in dots {
r.push_str(".");
}
r.push_str(&name);
r
},
<dots: "."+> => {
let mut r = "".to_string();
for _dot in dots {
r.push_str(".");
}
r
},
};
ImportAsNames: Vec<(String, Option<String>)> = {
<i:Comma<ImportPart<Identifier>>> => i,
"(" <i:Comma<ImportPart<Identifier>>> ")" => i,
// Star import all
vec![("*".to_string(), None)]
},
};
#[inline]
ImportPart<I>: (String, Option<String>) = {
<i:I> <a: ("as" Identifier)?> => (i, 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::LocatedStatement = {
<loc:@L> "global" <names:OneOrMore<Identifier>> => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::Global { names }
}
},
};
NonlocalStatement: ast::LocatedStatement = {
<loc:@L> "nonlocal" <names:OneOrMore<Identifier>> => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::Nonlocal { names }
}
},
};
AssertStatement: ast::LocatedStatement = {
<loc:@L> "assert" <t:Test> <m: ("," Test)?> => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::Assert {
test: t,
msg: match m {
Some(e) => Some(e.1),
None => None,
}
}
}
},
};
CompoundStatement: ast::LocatedStatement = {
IfStatement,
WhileStatement,
ForStatement,
TryStatement,
WithStatement,
FuncDef,
ClassDef,
};
IfStatement: ast::LocatedStatement = {
<loc:@L> "if" <t:Test> ":" <s1:Suite> <s2:(@L "elif" Test ":" Suite)*> <s3:("else" ":" Suite)?> => {
// Determine last else:
let mut last = match s3 {
Some(s) => Some(s.2),
None => None,
};
// handle elif:
for i in s2.into_iter().rev() {
let x = ast::LocatedStatement {
location: i.0,
node: ast::Statement::If { test: i.2, body: i.4, orelse: last },
};
last = Some(vec![x]);
}
ast::LocatedStatement {
location: loc,
node: ast::Statement::If { test: t, body: s1, orelse: last }
}
},
};
WhileStatement: ast::LocatedStatement = {
<loc:@L> "while" <e:Test> ":" <s:Suite> <s2:("else" ":" Suite)?> => {
let or_else = match s2 {
Some(s) => Some(s.2),
None => None,
};
ast::LocatedStatement {
location: loc,
node: ast::Statement::While { test: e, body: s, orelse: or_else },
}
},
};
ForStatement: ast::LocatedStatement = {
<loc:@L> "for" <e:ExpressionList> "in" <t:TestList> ":" <s:Suite> <s2:("else" ":" Suite)?> => {
let or_else = match s2 {
Some(s) => Some(s.2),
None => None,
};
ast::LocatedStatement {
location: loc,
node: ast::Statement::For {
target: e,
iter: t, body: s, orelse: or_else
},
}
},
};
TryStatement: ast::LocatedStatement = {
<loc:@L> "try" ":" <body:Suite> <handlers:ExceptClause*> <else_suite:("else" ":" Suite)?> <finally:("finally" ":" Suite)?> => {
let or_else = match else_suite {
Some(s) => Some(s.2),
None => None,
};
let finalbody = match finally {
Some(s) => Some(s.2),
None => None,
};
ast::LocatedStatement {
location: loc,
node: ast::Statement::Try {
body: body,
handlers: handlers,
orelse: or_else,
finalbody: finalbody,
},
}
},
};
ExceptClause: ast::ExceptHandler = {
"except" <typ:Test?> ":" <body:Suite> => {
ast::ExceptHandler {
typ: typ,
name: None,
body: body,
}
},
"except" <x:(Test "as" Identifier)> ":" <body:Suite> => {
ast::ExceptHandler {
typ: Some(x.0),
name: Some(x.2),
body: body,
}
},
};
WithStatement: ast::LocatedStatement = {
<loc:@L> "with" <items:OneOrMore<WithItem>> ":" <s:Suite> => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::With { items: items, body: s },
}
},
};
WithItem: ast::WithItem = {
<t:Test> <n:("as" Expression)?> => {
let optional_vars = match n {
Some(val) => Some(val.1),
None => None,
};
ast::WithItem { context_expr: t, optional_vars }
},
};
FuncDef: ast::LocatedStatement = {
<d:Decorator*> <loc:@L> "def" <i:Identifier> <a:Parameters> ":" <s:Suite> => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::FunctionDef {
name: i,
args: a,
body: s,
decorator_list: d,
}
}
},
};
Parameters: ast::Parameters = {
"(" <a: (TypedArgsList)?> ")" => {
match a {
Some(a) => a,
None => Default::default(),
}
},
};
// parameters are (String, None), kwargs are (String, Some(Test)) where Test is
// the default
TypedArgsList: ast::Parameters = {
<param1:TypedParameters> <args2:("," ParameterListStarArgs)?> => {
let (names, default_elements) = param1;
// Now gather rest of parameters:
let (vararg, kwonlyargs, kw_defaults, kwarg) = match args2 {
Some((_, x)) => x,
None => (None, vec![], vec![], None),
};
ast::Parameters {
args: names,
kwonlyargs: kwonlyargs,
vararg: vararg,
kwarg: kwarg,
defaults: default_elements,
kw_defaults: kw_defaults,
}
},
<param1:TypedParameters> <kw:("," KwargParameter)> => {
let (names, default_elements) = param1;
// Now gather rest of parameters:
let vararg = None;
let kwonlyargs = vec![];
let kw_defaults = vec![];
let kwarg = Some(kw.1);
ast::Parameters {
args: names,
kwonlyargs: kwonlyargs,
vararg: vararg,
kwarg: kwarg,
defaults: default_elements,
kw_defaults: kw_defaults,
}
},
<params:ParameterListStarArgs> => {
let (vararg, kwonlyargs, kw_defaults, kwarg) = params;
ast::Parameters {
args: vec![],
kwonlyargs: kwonlyargs,
vararg: vararg,
kwarg: kwarg,
defaults: vec![],
kw_defaults: kw_defaults,
}
},
<kw:KwargParameter> => {
ast::Parameters {
args: vec![],
kwonlyargs: vec![],
vararg: None,
kwarg: Some(kw),
defaults: vec![],
kw_defaults: vec![],
}
},
};
// Use inline here to make sure the "," is not creating an ambiguity.
#[inline]
TypedParameters: (Vec<String>, Vec<ast::Expression>) = {
<param1:TypedParameterDef> <param2:("," TypedParameterDef)*> => {
// Combine first parameters:
let mut args = vec![param1];
args.extend(param2.into_iter().map(|x| x.1));
let mut names = vec![];
let mut default_elements = vec![];
for (name, default) in args.into_iter() {
names.push(name.clone());
if let Some(default) = default {
default_elements.push(default);
} else {
if default_elements.len() > 0 {
// Once we have started with defaults, all remaining arguments must
// have defaults
panic!(
"non-default argument follows default argument: {}",
name
);
}
}
}
(names, default_elements)
}
};
TypedParameterDef: (String, Option<ast::Expression>) = {
<i:TypedParameter> => (i, None),
<i:TypedParameter> "=" <e:Test> => (i, Some(e)),
};
// TODO: add type annotations here:
TypedParameter: String = {
Identifier,
};
ParameterListStarArgs: (Option<Option<String>>, Vec<String>, Vec<Option<ast::Expression>>, Option<Option<String>>) = {
"*" <va:Identifier?> <kw:("," TypedParameterDef)*> <kwarg:("," KwargParameter)?> => {
// 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 = match kwarg {
Some((_, name)) => Some(name),
None => None,
};
(Some(va), kwonlyargs, kw_defaults, kwarg)
}
};
KwargParameter: Option<String> = {
"**" <kwarg:Identifier?> => {
kwarg
}
};
ClassDef: ast::LocatedStatement = {
<d:Decorator*> <loc:@L> "class" <n:Identifier> <a:("(" ArgumentList ")")?> ":" <s:Suite> => {
let (bases, keywords) = match a {
Some((_, args, _)) => args,
None => (vec![], vec![]),
};
ast::LocatedStatement {
location: loc,
node: ast::Statement::ClassDef {
name: n,
bases: bases,
keywords: keywords,
body: s,
decorator_list: d,
},
}
},
};
// Decorators:
Decorator: ast::Expression = {
"@" <n:DottedName> <a: ("(" ArgumentList ")")?> "\n" => {
let name = ast::Expression::Identifier { name: n };
match a {
Some((_, args, _)) => a
B94A
st::Expression::Call {
function: Box::new(name),
args: args.0,
keywords: args.1,
},
None => name,
}
},
};
YieldExpr: ast::Expression = {
"yield" <ex:TestList?> => {
ast::Expression::Yield {
value: ex.map(|expr| Box::new(
if expr.len() > 1 {
ast::Expression::Tuple { elements: expr }
} else {
expr.into_iter().next().unwrap()
})
)
}
},
"yield" "from" <e:Test> => {
ast::Expression::YieldFrom {
value: Box::new(e),
}
},
};
Test: ast::Expression = {
<e:OrTest> <c: ("if" OrTest "else" Test)?> => {
match c {
Some(c) => {
ast::Expression::IfExpression {
test: Box::new(c.1),
body: Box::new(e),
orelse: Box::new(c.3),
}
},
None => e,
}
},
<e:LambdaDef> => e,
};
LambdaDef: ast::Expression = {
"lambda" <p:TypedArgsList?> ":" <b:Expression> =>
ast::Expression::Lambda {
args: p.unwrap_or(Default::default()),
body:Box::new(b)
}
}
OrTest: ast::Expression = {
<e:AndTest> => e,
<e1:OrTest> "or" <e2:AndTest> => ast::Expression::BoolOp { a: Box::new(e1), op: ast::BooleanOperator::Or, b: Box::new(e2) },
};
AndTest: ast::Expression = {
<e:NotTest> => e,
<e1:AndTest> "and" <e2:NotTest> => ast::Expression::BoolOp { a: Box::new(e1), op: ast::BooleanOperator::And, b: Box::new(e2) },
};
NotTest: ast::Expression = {
"not" <e:NotTest> => ast::Expression::Unop { a: Box::new(e), op: ast::UnaryOperator::Not },
<e:Comparison> => e,
};
Comparison: ast::Expression = {
<e1:Comparison> <op:CompOp> <e2:Expression> => ast::Expression::Compare { a: Box::new(e1), op: op, b: Box::new(e2) },
<e:Expression> => e,
};
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> "|" <e2:XorExpression> => ast::Expression::Binop { a: Box::new(e1), op: ast::Operator::BitOr, b: Box::new(e2) },
<e:XorExpression> => e,
};
XorExpression: ast::Expression = {
<e1:XorExpression> "^" <e2:AndExpression> => ast::Expression::Binop { a: Box::new(e1), op: ast::Operator::BitXor, b: Box::new(e2) },
AndExpression,
};
AndExpression: ast::Expression = {
<e1:AndExpression> "&" <e2:ShiftExpression> => ast::Expression::Binop { a: Box::new(e1), op: ast::Operator::BitAnd, b: Box::new(e2) },
ShiftExpression,
};
ShiftExpression: ast::Expression = {
<e1:ShiftExpression> <op:ShiftOp> <e2:ArithmaticExpression> => ast::Expression::Binop { a: Box::new(e1), op: op, b: Box::new(e2) },
ArithmaticExpression,
};
ShiftOp: ast::Operator = {
"<<" => ast::Operator::LShift,
">>" => ast::Operator::RShift,
};
ArithmaticExpression: ast::Expression = {
<a:ArithmaticExpression> <op:AddOp> <b:Term> => ast::Expression::Binop { a: Box::new(a), op: op, b: Box::new(b) },
Term,
};
AddOp: ast::Operator = {
"+" => ast::Operator::Add,
"-" => ast::Operator::Sub,
};
Term: ast::Expression = {
<a:Term> <op:MulOp> <b:Factor> => ast::Expression::Binop { a: Box::new(a), op: 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 = {
"+" <e:Factor> => ast::Expression::Unop { a: Box::new(e), op: ast::UnaryOperator::Pos },
"-" <e:Factor> => ast::Expression::Unop { a: Box::new(e), op: ast::UnaryOperator::Neg },
"~" <e:Factor> => ast::Expression::Unop { a: Box::new(e), op: ast::UnaryOperator::Inv },
<e:Power> => e,
};
Power: ast::Expression = {
<e:AtomExpr> <e2:("**" Factor)?> => {
match e2 {
None => e,
Some(x) => ast::Expression::Binop { a: Box::new(e), op: ast::Operator::Pow, b: Box::new(x.1) },
}
}
};
AtomExpr: ast::Expression = {
<e:Atom> => e,
<f:AtomExpr> "(" <a:ArgumentList> ")" => ast::Expression::Call { function: Box::new(f), args: a.0, keywords: a.1 },
<e:AtomExpr> "[" <s:Subscript> "]" => ast::Expression::Subscript { a: Box::new(e), b: Box::new(s) },
<e:AtomExpr> "." <n:Identifier> => ast::Expression::Attribute { value: Box::new(e), name: n },
};
Subscript: ast::Expression = {
<e:Test> => e,
<e1:Test?> ":" <e2:Test?> <e3:SliceOp?> => {
let s1 = e1.unwrap_or(ast::Expression::None);
let s2 = e2.unwrap_or(ast::Expression::None);
let s3 = e3.unwrap_or(ast::Expression::None);
ast::Expression::Slice { elements: vec![s1, s2, s3] }
}
};
SliceOp: ast::Expression = {
":" <e:Test?> => e.unwrap_or(ast::Expression::None)
}
Atom: ast::Expression = {
StringConstant,
<n:Number> => ast::Expression::Number { value: n },
<i:Identifier> => ast::Expression::Identifier { name: i },
"[" <e:TestListComp?> "]" => {
let elements = e.unwrap_or(Vec::new());
ast::Expression::List { elements }
},
"[" <e:TestListComp2> "]" => {
// List comprehension:
e
},
"(" <e:TestList?> <trailing_comma:","?> "
5276
)" => {
match e {
None => ast::Expression::Tuple { elements: Vec::new() },
Some(elements) => {
if elements.len() == 1 && trailing_comma.is_none() {
// This is "(e)", which is equivalent to "e"
elements.into_iter().next().unwrap()
} else {
ast::Expression::Tuple { elements }
}
}
}
},
"(" <e:Test> <c:CompFor> ")" => {
ast::Expression::Comprehension {
kind: Box::new(ast::ComprehensionKind::GeneratorExpression { element: e }),
generators: c,
}
},
"{" <e:TestDict?> "}" => ast::Expression::Dict { elements: e.unwrap_or(Vec::new()) },
"{" <e:TestDictComp> "}" => e,
"{" <e:TestSet> "}" => ast::Expression::Set { elements: e },
"{" <e:TestSetComp> "}" => e,
"True" => ast::Expression::True,
"False" => ast::Expression::False,
"None" => ast::Expression::None,
};
TestListComp: Vec<ast::Expression> = {
<e:OneOrMore<TestOrStarExpr>> <_trailing_comma:","?> => {
e
},
};
TestListComp2: ast::Expression = {
<e:TestOrStarExpr> <c:CompFor> => {
ast::Expression::Comprehension {
kind: Box::new(ast::ComprehensionKind::List { element: e }),
generators: c,
}
},
};
TestDict: Vec<(ast::Expression, ast::Expression)> = {
<e1:OneOrMore<DictEntry>> <_trailing_comma:","?> => {
e1
}
};
TestDictComp: ast::Expression = {
<e1:DictEntry> <c:CompFor> => {
ast::Expression::Comprehension {
kind: Box::new(ast::ComprehensionKind::Dict { key: e1.0, value: e1.1 }),
generators: c,
}
}
};
DictEntry: (ast::Expression, ast::Expression) = {
<e1: Test> ":" <e2: Test> => (e1, e2),
};
TestSet: Vec<ast::Expression> = {
<e1:OneOrMore<Test>> ","? => {
e1
}
};
TestSetComp: ast::Expression = {
<e1:Test> <c:CompFor> => {
ast::Expression::Comprehension {
kind: Box::new(ast::ComprehensionKind::Set { element: e1 }),
generators: c,
}
}
};
ExpressionList: ast::Expression = {
<e: ExpressionList2> => {
if e.len() == 1 {
e.into_iter().next().unwrap()
} else {
ast::Expression::Tuple { elements: e }
}
},
};
ExpressionList2: Vec<ast::Expression> = {
<e1:Expression> <e2:("," Expression)*> ","? => {
let mut l = vec![e1];
l.extend(e2.into_iter().map(|x| x.1));
l
},
};
#[inline]
TestList: Vec<ast::Expression> = {
<e1:Test> <e2: ("," Test)*> => {
let mut l = vec![e1];
l.extend(e2.into_iter().map(|x| x.1));
l
}
};
// Test
StarExpr: ast::Expression = {
"*" <e:Expression> => ast::Expression::Starred { value: Box::new(e) },
};
// Comprehensions:
CompFor: Vec<ast::Comprehension> = {
<c:SingleForComprehension+> => c,
};
SingleForComprehension: ast::Comprehension = {
"for" <e:ExpressionList> "in" <i:OrTest> <c2:ComprehensionIf*> => {
ast::Comprehension {
target: e,
iter: i,
ifs: c2,
}
}
};
ExpressionNoCond: ast::Expression = {
OrTest,
};
ComprehensionIf: ast::Expression = {
"if" <c:ExpressionNoCond> => c,
};
ArgumentList: (Vec<ast::Expression>, Vec<ast::Keyword>) = {
<e: Comma<FunctionArgument>> => {
let mut args = vec![];
let mut keywords = vec![];
for (name, value) in e {
match name {
Some(n) => {
keywords.push(ast::Keyword { name: n, value: value });
},
None => {
if keywords.len() > 0 {
panic!("positional argument follows keyword argument");
};
args.push(value);
},
}
}
(args, keywords)
}
};
FunctionArgument: (Option<Option<String>>, ast::Expression) = {
<e:Test> <c:CompFor?> => {
let expr = match c {
Some(c) => ast::Expression::Comprehension {
kind: Box::new(ast::ComprehensionKind::GeneratorExpression { element: e }),
generators: c,
},
None => e,
};
(None, expr)
},
<i:Identifier> "=" <e:Test> => (Some(Some(i.clone())), e),
"*" <e:Test> => (None, ast::Expression::Starred { value: Box::new(e) }),
"**" <e:Test> => (Some(None), e),
};
Comma<T>: Vec<T> = {
<items: (<T> ",")*> <last: T?> => {
let mut items = items;
items.extend(last);
items
}
};
#[inline]
OneOrMore<T>: Vec<T> = {
<i1: T> <i2:("," T)*> => {
let mut items = vec![i1];
items.extend(i2.into_iter().map(|e| e.1));
items
}
};
Number: ast::Number = {
<s:int> => { ast::Number::Integer { value: s } },
<s:float> => { ast::Number::Float { value: s } },
<s:complex> => { ast::Number::Complex { real: s.0, imag: s.1 } },
};
StringConstant: ast::Expression = {
<s:string+> => {
let glued = s.join("");
ast::Expression::String { value: glued }
},
<s:bytes+> => {