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630 lines (570 loc) · 17.1 KB
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// See also: file:///usr/share/doc/python/html/reference/grammar.html?highlight=grammar
use super::ast;
use super::lexer;
use std::iter::FromIterator;
use std::str::FromStr;
grammar;
pub 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,
};
pub Statement: ast::LocatedStatement = {
SimpleStatement,
CompoundStatement,
};
SimpleStatement: ast::LocatedStatement = {
<s:SmallStatement> "\n" => s,
<s:SmallStatement> ";" => s,
};
SmallStatement: ast::LocatedStatement = {
// <e:Expression> => ast::Statement::Expression { expression: e },
ExpressionStatement,
<loc:@L> "pass" => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::Pass,
}
},
FlowStatement,
ImportStatement,
AssertStatement,
};
ExpressionStatement: ast::LocatedStatement = {
<loc:@L> <e:TestList> <e2:AssignSuffix*> => {
//match e2 {
// None => ast::Statement::Expression { expression: e },
// Some(e3) => ast::Statement::Expression { expression: e },
//}
if e2.len() > 0 {
// Dealing with assignment here
// TODO: for rhs in e2 {
let rhs = e2.into_iter().next().unwrap();
// ast::Expression::Tuple { elements: e2.into_iter().next().unwrap()
let v = rhs.into_iter().next().unwrap();
let lhs = ast::LocatedStatement {
location: loc.clone(),
node: ast::Statement::Assign { targets: e, value: v },
};
lhs
} else {
if e.len() > 1 {
panic!("Not good?");
// ast::Statement::Expression { expression: e[0] }
} else {
ast::LocatedStatement {
location: loc.clone(),
node: ast::Statement::Expression { expression: e.into_iter().next().unwrap() },
}
}
}
},
<loc:@L> <e1:Test> <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: e1, op: op, value: rhs },
}
},
};
AssignSuffix: Vec<ast::Expression> = {
"=" <e:TestList> => e,
};
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> "raise" <t:Test?> => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::Raise { expression: t },
}
},
// yield
};
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:DottedName> "import" <i: Comma<ImportPart<Identifier>>> => {
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()
},
}
},
};
#[inline]
ImportPart<I>: (String, Option<String>) = {
<i:I> <a: ("as" Identifier)?> => (i, a.map(|a| a.1)),
};
DottedName: String = {
<n:name> => n,
};
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" <t:Test> "as" <_e:Expression> ":" <s:Suite> => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::With { items: t, body: s },
}
},
};
FuncDef: ast::LocatedStatement = {
<loc:@L> "def" <i:Identifier> <a:Parameters> ":" <s:Suite> => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::FunctionDef { name: i, args: a, body: s }
}
},
};
Parameters: Vec<(String, Option<ast::Expression>)> = {
"(" <a: TypedArgsList> ")" => a,
};
// parameters are (String, None), kwargs are (String, Some(Test)) where Test is
// the default
TypedArgsList: Vec<(String, Option<ast::Expression>)> = {
<a: Comma<Parameter>> => a
};
Parameter: (String, Option<ast::Expression>) = {
<i:Identifier> => (i.clone(), None),
<i:Identifier> "=" <e:Expression> => (i.clone(), Some(e.clone())),
};
ClassDef: ast::LocatedStatement = {
<loc:@L> "class" <n:Identifier> <a:Parameters?> ":" <s:Suite> => {
ast::LocatedStatement {
location: loc,
node: ast::Statement::ClassDef {
name: n,
args: a.unwrap_or(vec![]),
body: s
},
}
},
};
Test: ast::Expression = {
<e:OrTest> => e,
<e:LambdaDef> => e,
};
LambdaDef: ast::Expression = {
"lambda" <p:TypedArgsList> ":" <b:Expression> =>
ast::Expression::Lambda {
args:p,
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,
};
pub 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) },
<e:AndExpression> => e,
};
AndExpression: ast::Expression = {
<e1:AndExpression> "&" <e2:ArithmaticExpression> => ast::Expression::Binop { a: Box::new(e1), op: ast::Operator::BitAnd, b: Box::new(e2) },
<e:ArithmaticExpression> => e,
};
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> => e,
"-" <e:Factor> => ast::Expression::Unop { a: Box::new(e), op: ast::UnaryOperator::Neg },
<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:FunctionArguments> ")" => ast::Expression::Call { function: Box::new(f), args: a },
<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 = {
<s:String> => ast::Expression::String { value: s },
<n:Number> => ast::Expression::Number { value: n },
<i:Identifier> => ast::Expression::Identifier { name: i },
"[" <e:TestList?> <_trailing_comma:","?> "]" => {
match e {
None => ast::Expression::List { elements: Vec::new() },
Some(elements) => ast::Expression::List { elements },
}
},
"(" <e:TestList?> <trailing_comma:","?> ")" => {
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:TestDict?> "}" => ast::Expression::Dict { elements: e.unwrap_or(Vec::new()) },
"True" => ast::Expression::True,
"False" => ast::Expression::False,
"None" => ast::Expression::None,
};
TestDict: Vec<(ast::Expression, ast::Expression)> = {
<e1:DictEntry> <e2:("," DictEntry)*> <_trailing_comma:","?> => {
let mut d = vec![e1];
d.extend(e2.into_iter().map(|x| x.1));
d
}
};
DictEntry: (ast::Expression, ast::Expression) = {
<e1: Test> ":" <e2: Test> => (e1, e2),
};
ExpressionList: Vec<ast::Expression> = {
<e: Comma<Expression>> => e,
};
#[inline]
TestList: Vec<ast::Expression> = {
<e1:Test> <e2: ("," Test)*> => {
let mut l = vec![e1];
l.extend(e2.into_iter().map(|x| x.1));
l
}
};
FunctionArguments: Vec<(Option<String>, ast::Expression)> = {
<e: Comma<FunctionArgument>> => e,
};
FunctionArgument: (Option<String>, ast::Expression) = {
<e:Expression> => (None, e.clone()),
<i:Identifier> "=" <e:Expression> => (Some(i.clone()), e.clone()),
};
Comma<T>: Vec<T> = {
<items: (<T> ",")*> <last: T?> => {
let mut items = items;
items.extend(last);
items
}
};
Number: ast::Number = {
<s:number> => {
if s.contains(".") {
ast::Number::Float { value: f64::from_str(&s).unwrap() }
} else {
ast::Number::Integer { value: i32::from_str(&s).unwrap() }
}
}
};
String: String = {
<s:string+> => {
s.join("")
},
};
Identifier: String = <s:name> => s;
// Hook external lexer:
extern {
type Location = lexer::Location;
type Error = lexer::LexicalError;
enum lexer::Tok {
indent => lexer::Tok::Indent,
dedent => lexer::Tok::Dedent,
"+" => lexer::Tok::Plus,
"-" => lexer::Tok::Minus,
":" => lexer::Tok::Colon,
"." => lexer::Tok::Dot,
"," => lexer::Tok::Comma,
"*" => lexer::Tok::Star,
"**" => lexer::Tok::DoubleStar,
"&" => lexer::Tok::Amper,
"@" => lexer::Tok::At,
"%" => lexer::Tok::Percent,
"//" => lexer::Tok::DoubleSlash,
"^" => lexer::Tok::CircumFlex,
"|" => lexer::Tok::Vbar,
"/" => lexer::Tok::Slash,
"(" => lexer::Tok::Lpar,
")" => lexer::Tok::Rpar,
"[" => lexer::Tok::Lsqb,
"]" => lexer::Tok::Rsqb,
"{" => lexer::Tok::Lbrace,
"}" => lexer::Tok::Rbrace,
"=" => lexer::Tok::Equal,
"+=" => lexer::Tok::PlusEqual,
"-=" => lexer::Tok::MinusEqual,
"*=" => lexer::Tok::StarEqual,
"@=" => lexer::Tok::AtEqual,
"/=" => lexer::Tok::SlashEqual,
"%=" => lexer::Tok::PercentEqual,
"&=" => lexer::Tok::AmperEqual,
"|=" => lexer::Tok::VbarEqual,
"^=" => lexer::Tok::CircumflexEqual,
"<<=" => lexer::Tok::LeftShiftEqual,
">>=" => lexer::Tok::RightShiftEqual,
"**=" => lexer::Tok::DoubleStarEqual,
"//=" => lexer::Tok::DoubleSlashEqual,
"==" => lexer::Tok::EqEqual,
"!=" => lexer::Tok::NotEqual,
"<" => lexer::Tok::Less,
"<=" => lexer::Tok::LessEqual,
">" => lexer::Tok::Greater,
">=" => lexer::Tok::GreaterEqual,
"and" => lexer::Tok::And,
"as" => lexer::Tok::As,
"assert" => lexer::Tok::Assert,
"break" => lexer::Tok::Break,
"class" => lexer::Tok::Class,
"continue" => lexer::Tok::Break,
"def" => lexer::Tok::Def,
"elif" => lexer::Tok::Elif,
"else" => lexer::Tok::Else,
"except" => lexer::Tok::Except,
"finally" => lexer::Tok::Finally,
"for" => lexer::Tok::For,
"if" => lexer::Tok::If,
"in" => lexer::Tok::In,
"is" => lexer::Tok::Is,
"import" => lexer::Tok::Import,
"from" => lexer::Tok::From,
"not" => lexer::Tok::Not,
"or" => lexer::Tok::Or,
"pass" => lexer::Tok::Pass,
"raise" => lexer::Tok::Raise,
"return" => lexer::Tok::Return,
"try" => lexer::Tok::Try,
"while" => lexer::Tok::While,
"with" => lexer::Tok::With,
"lambda" => lexer::Tok::Lambda,
"True" => lexer::Tok::True,
"False" => lexer::Tok::False,
"None" => lexer::Tok::None,
number => lexer::Tok::Number { value: <String> },
string => lexer::Tok::String { value: <String> },
name => lexer::Tok::Name { name: <String> },
"\n" => lexer::Tok::Newline,
";" => lexer::Tok::Semi,
}
}