Parser/parser/src/parser.rs at main · RustPython/Parser · GitHub

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//! Contains the interface to the Python parser.

//!

//! Functions in this module can be used to parse Python code into an [Abstract Syntax Tree]

//! (AST) that is then transformed into bytecode.

//!

//! There are three ways to parse Python code corresponding to the different [`Mode`]s

//! defined in the [`mode`] module.

//!

//! All functions return a [`Result`](std::result::Result) containing the parsed AST or

//! a [`ParseError`] if parsing failed.

//!

//! [Abstract Syntax Tree]: https://en.wikipedia.org/wiki/Abstract_syntax_tree

//! [`Mode`]: crate::mode

use crate::{

ast::{self, OptionalRange, Ranged},

lexer::{self, LexResult, LexicalError, LexicalErrorType},

python,

text_size::TextSize,

token::Tok,

Mode,

};

use itertools::Itertools;

use std::iter;

use crate::{lexer::Lexer, soft_keywords::SoftKeywordTransformer, text_size::TextRange};

pub(super) use lalrpop_util::ParseError as LalrpopError;

/// Parse Python code string to implementor's type.

///

/// # Example

///

/// For example, parsing a simple function definition and a call to that function:

///

/// ```

/// use rustpython_parser::{self as parser, ast, Parse};

/// let source = r#"

/// def foo():

/// return 42

///

/// print(foo())

/// "#;

/// let program = ast::Suite::parse(source, "<embedded>");

/// assert!(program.is_ok());

/// ```

///

/// Parsing a single expression denoting the addition of two numbers, but this time specifying a different,

/// somewhat silly, location:

///

/// ```

/// use rustpython_parser::{self as parser, ast, Parse, text_size::TextSize};

///

/// let expr = ast::Expr::parse_starts_at("1 + 2", "<embedded>", TextSize::from(400));

/// assert!(expr.is_ok());

pub trait Parse

where

Self: Sized,

{

fn parse(source: &str, source_path: &str) -> Result<Self, ParseError> {

Self::parse_starts_at(source, source_path, TextSize::default())

}

fn parse_without_path(source: &str) -> Result<Self, ParseError> {

Self::parse(source, "<unknown>")

}

fn parse_starts_at(

source: &str,

source_path: &str,

offset: TextSize,

) -> Result<Self, ParseError> {

let lxr = Self::lex_starts_at(source, offset);

#[cfg(feature = "full-lexer")]

let lxr =

lxr.filter_ok(|(tok, _)| !matches!(tok, Tok::Comment { .. } | Tok::NonLogicalNewline));

Self::parse_tokens(lxr, source_path)

}

fn lex_starts_at(

source: &str,

offset: TextSize,

) -> SoftKeywordTransformer<Lexer<std::str::Chars>>;

fn parse_tokens(

lxr: impl IntoIterator<Item = LexResult>,

source_path: &str,

) -> Result<Self, ParseError>;

}

impl Parse for ast::ModModule {

fn lex_starts_at(

source: &str,

offset: TextSize,

) -> SoftKeywordTransformer<Lexer<std::str::Chars>> {

lexer::lex_starts_at(source, Mode::Module, offset)

}

fn parse_tokens(

lxr: impl IntoIterator<Item = LexResult>,

source_path: &str,

) -> Result<Self, ParseError> {

match parse_filtered_tokens(lxr, Mode::Module, source_path)? {

ast::Mod::Module(m) => Ok(m),

_ => unreachable!("Mode::Module doesn't return other variant"),

}

impl Parse for ast::ModExpression {

fn lex_starts_at(

source: &str,

offset: TextSize,

) -> SoftKeywordTransformer<Lexer<std::str::Chars>> {

lexer::lex_starts_at(source, Mode::Expression, offset)

}

fn parse_tokens(

lxr: impl IntoIterator<Item = LexResult>,

source_path: &str,

) -> Result<Self, ParseError> {

match parse_filtered_tokens(lxr, Mode::Expression, source_path)? {

ast::Mod::Expression(m) => Ok(m),

_ => unreachable!("Mode::Module doesn't return other variant"),

}

impl Parse for ast::ModInteractive {

fn lex_starts_at(

source: &str,

offset: TextSize,

) -> SoftKeywordTransformer<Lexer<std::str::Chars>> {

lexer::lex_starts_at(source, Mode::Interactive, offset)

}

fn parse_tokens(

lxr: impl IntoIterator<Item = LexResult>,

source_path: &str,

) -> Result<Self, ParseError> {

match parse_filtered_tokens(lxr, Mode::Interactive, source_path)? {

ast::Mod::Interactive(m) => Ok(m),

_ => unreachable!("Mode::Module doesn't return other variant"),

}

impl Parse for ast::Suite {

fn lex_starts_at(

source: &str,

offset: TextSize,

) -> SoftKeywordTransformer<Lexer<std::str::Chars>> {

ast::ModModule::lex_starts_at(source, offset)

}

fn parse_tokens(

lxr: impl IntoIterator<Item = LexResult>,

source_path: &str,

) -> Result<Self, ParseError> {

Ok(ast::ModModule::parse_tokens(lxr, source_path)?.body)

}

impl Parse for ast::Stmt {

fn lex_starts_at(

source: &str,

offset: TextSize,

) -> SoftKeywordTransformer<Lexer<std::str::Chars>> {

ast::ModModule::lex_starts_at(source, offset)

}

fn parse_tokens(

lxr: impl IntoIterator<Item = LexResult>,

source_path: &str,

) -> Result<Self, ParseError> {

let mut statements = ast::ModModule::parse_tokens(lxr, source_path)?.body;

let statement = match statements.len() {

0 => {

return Err(ParseError {

error: ParseErrorType::Eof,

offset: TextSize::default(),

source_path: source_path.to_owned(),

})

}

1 => statements.pop().unwrap(),

_ => {

return Err(ParseError {

error: ParseErrorType::InvalidToken,

offset: statements[1].range().start(),

source_path: source_path.to_owned(),

})

}

};

Ok(statement)

}

impl Parse for ast::Expr {

fn lex_starts_at(

source: &str,

offset: TextSize,

) -> SoftKeywordTransformer<Lexer<std::str::Chars>> {

ast::ModExpression::lex_starts_at(source, offset)

}

fn parse_tokens(

lxr: impl IntoIterator<Item = LexResult>,

source_path: &str,

) -> Result<Self, ParseError> {

Ok(*ast::ModExpression::parse_tokens(lxr, source_path)?.body)

}

impl Parse for ast::Identifier {

fn lex_starts_at(

source: &str,

offset: TextSize,

) -> SoftKeywordTransformer<Lexer<std::str::Chars>> {

ast::Expr::lex_starts_at(source, offset)

}

fn parse_tokens(

lxr: impl IntoIterator<Item = LexResult>,

source_path: &str,

) -> Result<Self, ParseError> {

let expr = ast::Expr::parse_tokens(lxr, source_path)?;

match expr {

ast::Expr::Name(name) => Ok(name.id),

expr => Err(ParseError {

error: ParseErrorType::InvalidToken,

offset: expr.range().start(),

source_path: source_path.to_owned(),

}),

}

impl Parse for ast::Constant {

fn lex_starts_at(

source: &str,

offset: TextSize,

) -> SoftKeywordTransformer<Lexer<std::str::Chars>> {

ast::Expr::lex_starts_at(source, offset)

}

fn parse_tokens(

lxr: impl IntoIterator<Item = LexResult>,

source_path: &str,

) -> Result<Self, ParseError> {

let expr = ast::Expr::parse_tokens(lxr, source_path)?;

match expr {

ast::Expr::Constant(c) => Ok(c.value),

expr => Err(ParseError {

error: ParseErrorType::InvalidToken,

offset: expr.range().start(),

source_path: source_path.to_owned(),

}),

}

/// Parse a full Python program usually consisting of multiple lines.

///

/// This is a convenience function that can be used to parse a full Python program without having to

/// specify the [`Mode`] or the location. It is probably what you want to use most of the time.

///

/// # Example

///

/// For example, parsing a simple function definition and a call to that function:

///

/// ```

/// use rustpython_parser as parser;

/// let source = r#"

/// def foo():

/// return 42

///

/// print(foo())

/// "#;

/// let program = parser::parse_program(source, "<embedded>");

/// assert!(program.is_ok());

/// ```

#[deprecated = "Use ast::Suite::parse from rustpython_parser::Parse trait."]

pub fn parse_program(source: &str, source_path: &str) -> Result<ast::Suite, ParseError> {

parse(source, Mode::Module, source_path).map(|top| match top {

ast::Mod::Module(ast::ModModule { body, .. }) => body,

_ => unreachable!(),

})

}

/// Parses a single Python expression.

///

/// This convenience function can be used to parse a single expression without having to

/// specify the Mode or the location.

///

/// # Example

///

/// For example, parsing a single expression denoting the addition of two numbers:

///

/// ```

/// use rustpython_parser as parser;

/// let expr = parser::parse_expression("1 + 2", "<embedded>");

///

/// assert!(expr.is_ok());

///

/// ```

#[deprecated = "Use ast::Expr::parse from rustpython_parser::Parse trait."]

pub fn parse_expression(source: &str, path: &str) -> Result<ast::Expr, ParseError> {

ast::Expr::parse(source, path)

}

/// Parses a Python expression from a given location.

///

/// This function allows to specify the location of the expression in the source code, other than

/// that, it behaves exactly like [`parse_expression`].

///

/// # Example

///

/// Parsing a single expression denoting the addition of two numbers, but this time specifying a different,

/// somewhat silly, location:

///

/// ```

/// use rustpython_parser::{text_size::TextSize, parse_expression_starts_at};

///

/// let expr = parse_expression_starts_at("1 + 2", "<embedded>", TextSize::from(400));

/// assert!(expr.is_ok());

/// ```

#[deprecated = "Use ast::Expr::parse_starts_at from rustpython_parser::Parse trait."]

pub fn parse_expression_starts_at(

source: &str,

path: &str,

offset: TextSize,

) -> Result<ast::Expr, ParseError> {

ast::Expr::parse_starts_at(source, path, offset)

}

/// Parse the given Python source code using the specified [`Mode`].

///

/// This function is the most general function to parse Python code. Based on the [`Mode`] supplied,

/// it can be used to parse a single expression, a full Python program or an interactive expression.

///

/// # Example

///

/// If we want to parse a simple expression, we can use the [`Mode::Expression`] mode during

/// parsing:

///

/// ```

/// use rustpython_parser::{Mode, parse};

///

/// let expr = parse("1 + 2", Mode::Expression, "<embedded>");

/// assert!(expr.is_ok());

/// ```

///

/// Alternatively, we can parse a full Python program consisting of multiple lines:

///

/// ```

/// use rustpython_parser::{Mode, parse};

///

/// let source = r#"

/// class Greeter:

///

/// def greet(self):

/// print("Hello, world!")

/// "#;

/// let program = parse(source, Mode::Module, "<embedded>");

/// assert!(program.is_ok());

/// ```

pub fn parse(source: &str, mode: Mode, source_path: &str) -> Result<ast::Mod, ParseError> {

parse_starts_at(source, mode, source_path, TextSize::default())

}

/// Parse the given Python source code using the specified [`Mode`] and [`Location`].

///

/// This function allows to specify the location of the the source code, other than

/// that, it behaves exactly like [`parse`].

///

/// # Example

///

/// ```

/// use rustpython_parser::{text_size::TextSize, Mode, parse_starts_at};

///

/// let source = r#"

/// def fib(i):

/// a, b = 0, 1

/// for _ in range(i):

/// a, b = b, a + b

/// return a

///

/// print(fib(42))

/// "#;

/// let program = parse_starts_at(source, Mode::Module, "<embedded>", TextSize::from(0));

/// assert!(program.is_ok());

/// ```

pub fn parse_starts_at(

source: &str,

mode: Mode,

source_path: &str,

offset: TextSize,

) -> Result<ast::Mod, ParseError> {

let lxr = lexer::lex_starts_at(source, mode, offset);

parse_tokens(lxr, mode, source_path)

}

/// Parse an iterator of [`LexResult`]s using the specified [`Mode`].

///

/// This could allow you to perform some preprocessing on the tokens before parsing them.

///

/// # Example

///

/// As an example, instead of parsing a string, we can parse a list of tokens after we generate

/// them using the [`lexer::lex`] function:

///

/// ```

/// use rustpython_parser::{lexer::lex, Mode, parse_tokens};

///

/// let expr = parse_tokens(lex("1 + 2", Mode::Expression), Mode::Expression, "<embedded>");

/// assert!(expr.is_ok());

/// ```

pub fn parse_tokens(

lxr: impl IntoIterator<Item = LexResult>,

mode: Mode,

source_path: &str,

) -> Result<ast::Mod, ParseError> {

let lxr = lxr.into_iter();

#[cfg(feature = "full-lexer")]

let lxr =

lxr.filter_ok(|(tok, _)| !matches!(tok, Tok::Comment { .. } | Tok::NonLogicalNewline));

parse_filtered_tokens(lxr, mode, source_path)

}

fn parse_filtered_tokens(

lxr: impl IntoIterator<Item = LexResult>,

mode: Mode,

source_path: &str,

) -> Result<ast::Mod, ParseError> {

let marker_token = (Tok::start_marker(mode), Default::default());

let lexer = iter::once(Ok(marker_token)).chain(lxr);

python::TopParser::new()

.parse(

lexer

.into_iter()

.map_ok(|(t, range)| (range.start(), t, range.end())),

)

.map_err(|e| parse_error_from_lalrpop(e, source_path))

}

/// Represents represent errors that occur during parsing and are

/// returned by the `parse_*` functions.

pub type ParseError = rustpython_parser_core::BaseError<ParseErrorType>;

/// Represents the different types of errors that can occur during parsing.

#[derive(Debug, PartialEq)]

pub enum ParseErrorType {

/// Parser encountered an unexpected end of input

Eof,

/// Parser encountered an extra token

ExtraToken(Tok),

/// Parser encountered an invalid token

InvalidToken,

/// Parser encountered an unexpected token

UnrecognizedToken(Tok, Option<String>),

// Maps to `User` type from `lalrpop-util`

/// Parser encountered an error during lexing.

Lexical(LexicalErrorType),

}

impl std::error::Error for ParseErrorType {}

// Convert `lalrpop_util::ParseError` to our internal type

fn parse_error_from_lalrpop(

err: LalrpopError<TextSize, Tok, LexicalError>,

source_path: &str,

) -> ParseError {

let source_path = source_path.to_owned();

match err {

// TODO: Are there cases where this isn't an EOF?

LalrpopError::InvalidToken { location } => ParseError {

error: ParseErrorType::Eof,

offset: location,

source_path,

LalrpopError::ExtraToken { token } => ParseError {

error: ParseErrorType::ExtraToken(token.1),

offset: token.0,

source_path,

LalrpopError::User { error } => ParseError {

error: ParseErrorType::Lexical(error.error),

offset: error.location,

source_path,

LalrpopError::UnrecognizedToken { token, expected } => {

// Hacky, but it's how CPython does it. See PyParser_AddToken,

// in particular "Only one possible expected token" comment.

let expected = (expected.len() == 1).then(|| expected[0].clone());

ParseError {

error: ParseErrorType::UnrecognizedToken(token.1, expected),

offset: token.0,

source_path,

}

LalrpopError::UnrecognizedEof { location, expected } => {

// This could be an initial indentation error that we should ignore

let indent_error = expected == ["Indent"];

if indent_error {

ParseError {

error: ParseErrorType::Lexical(LexicalErrorType::IndentationError),

offset: location,

source_path,

}

} else {

ParseError {

error: ParseErrorType::Eof,

offset: location,

source_path,

}

impl std::fmt::Display for ParseErrorType {

fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {

match *self {

ParseErrorType::Eof => write!(f, "Got unexpected EOF"),

ParseErrorType::ExtraToken(ref tok) => write!(f, "Got extraneous token: {tok:?}"),

ParseErrorType::InvalidToken => write!(f, "Got invalid token"),

ParseErrorType::UnrecognizedToken(ref tok, ref expected) => {

if *tok == Tok::Indent {

write!(f, "unexpected indent")

} else if expected.as_deref() == Some("Indent") {

write!(f, "expected an indented block")

} else {

write!(f, "invalid syntax. Got unexpected token {tok}")

}

ParseErrorType::Lexical(ref error) => write!(f, "{error}"),

}

impl ParseErrorType {

/// Returns true if the error is an indentation error.

pub fn is_indentation_error(&self) -> bool {

match self {

ParseErrorType::Lexical(LexicalErrorType::IndentationError) => true,

ParseErrorType::UnrecognizedToken(token, expected) => {

*token == Tok::Indent || expected.clone() == Some("Indent".to_owned())

}

_ => false,

}

/// Returns true if the error is a tab error.

pub fn is_tab_error(&self) -> bool {

matches!(

self,

ParseErrorType::Lexical(LexicalErrorType::TabError)

| ParseErrorType::Lexical(LexicalErrorType::TabsAfterSpaces)

)

}

#[inline(always)]

pub(super) fn optional_range(start: TextSize, end: TextSize) -> OptionalRange<TextRange> {

OptionalRange::<TextRange>::new(start, end)

}

include!("gen/parse.rs");

#[cfg(test)]

mod tests {

use super::*;

use crate::{ast, Parse};

#[test]

fn test_parse_empty() {

let parse_ast = ast::Suite::parse("", "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

fn test_parse_string() {

let source = "'Hello world'";

let parse_ast = ast::Suite::parse(source, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

fn test_parse_f_string() {

let source = "f'Hello world'";

let parse_ast = ast::Suite::parse(source, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

fn test_parse_print_hello() {

let source = "print('Hello world')";

let parse_ast = ast::Suite::parse(source, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

fn test_parse_print_2() {

let source = "print('Hello world', 2)";

let parse_ast = ast::Suite::parse(source, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

fn test_parse_kwargs() {

let source = "my_func('positional', keyword=2)";

let parse_ast = ast::Suite::parse(source, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

fn test_parse_if_elif_else() {

let source = "if 1: 10\nelif 2: 20\nelse: 30";

let parse_ast = ast::Suite::parse(source, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

#[cfg(feature = "all-nodes-with-ranges")]

fn test_parse_lambda() {

let source = "lambda x, y: x * y"; // lambda(x, y): x * y";

let parse_ast = ast::Suite::parse(source, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

fn test_parse_tuples() {

let source = "a, b = 4, 5";

insta::assert_debug_snapshot!(ast::Suite::parse(source, "<test>").unwrap());

}

#[test]

#[cfg(feature = "all-nodes-with-ranges")]

fn test_parse_class() {

let source = "\

class Foo(A, B):

def __init__(self):

pass

def method_with_default(self, arg='default'):

pass

insta::assert_debug_snapshot!(ast::Suite::parse(source, "<test>").unwrap());

}

#[test]

#[cfg(feature = "all-nodes-with-ranges")]

fn test_parse_class_generic_types() {

let source = "\

# TypeVar

class Foo[T](): ...

# TypeVar with bound

class Foo[T: str](): ...

# TypeVar with tuple bound

class Foo[T: (str, bytes)](): ...

# Multiple TypeVar

class Foo[T, U](): ...

# Trailing comma

class Foo[T, U,](): ...

# TypeVarTuple

class Foo[*Ts](): ...

# ParamSpec

class Foo[**P](): ...

# Mixed types

class Foo[X, Y: str, *U, **P]():

pass

insta::assert_debug_snapshot!(ast::Suite::parse(source, "<test>").unwrap());

}

#[test]

#[cfg(feature = "all-nodes-with-ranges")]

fn test_parse_function_definition() {

let source = "\

def func(a):

...

def func[T](a: T) -> T:

...

def func[T: str](a: T) -> T:

...

def func[T: (str, bytes)](a: T) -> T:

...

def func[*Ts](*a: *Ts):

...

def func[**P](*args: P.args, **kwargs: P.kwargs):

...

def func[T, U: str, *Ts, **P]():

pass

insta::assert_debug_snapshot!(ast::Suite::parse(source, "<test>").unwrap());

}

#[test]

#[cfg(feature = "all-nodes-with-ranges")]

fn test_parse_dict_comprehension() {

let source = "{x1: x2 for y in z}";

let parse_ast = ast::Expr::parse(source, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

#[cfg(feature = "all-nodes-with-ranges")]

fn test_parse_list_comprehension() {

let source = "[x for y in z]";

let parse_ast = ast::Expr::parse(source, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

#[cfg(feature = "all-nodes-with-ranges")]

fn test_parse_double_list_comprehension() {

let source = "[x for y, y2 in z for a in b if a < 5 if a > 10]";

let parse_ast = ast::Expr::parse(source, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

#[cfg(feature = "all-nodes-with-ranges")]

fn test_parse_generator_comprehension() {

let source = "(x for y in z)";

let parse_ast = ast::Expr::parse(source, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

#[cfg(feature = "all-nodes-with-ranges")]

fn test_parse_named_expression_generator_comprehension() {

let source = "(x := y + 1 for y in z)";

let parse_ast = ast::Expr::parse(source, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

#[cfg(feature = "all-nodes-with-ranges")]

fn test_parse_if_else_generator_comprehension() {

let source = "(x if y else y for y in z)";

let parse_ast = ast::Expr::parse(source, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

fn test_parse_bool_op_or() {

let source = "x or y";

let parse_ast = ast::Expr::parse(source, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

fn test_parse_bool_op_and() {

let source = "x and y";

let parse_ast = ast::Expr::parse(source, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

fn test_slice() {

let source = "x[1:2:3]";

let parse_ast = ast::Expr::parse(source, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

#[cfg(feature = "all-nodes-with-ranges")]

fn test_with_statement() {

let source = "\

with 0: pass

with 0 as x: pass

with 0, 1: pass

with 0 as x, 1 as y: pass

with 0 if 1 else 2: pass

with 0 if 1 else 2 as x: pass

with (): pass

with () as x: pass

with (0): pass

with (0) as x: pass

with (0,): pass

with (0,) as x: pass

with (0, 1): pass

with (0, 1) as x: pass

with (*a,): pass

with (*a,) as x: pass

with (0, *a): pass

with (0, *a) as x: pass

with (a := 0): pass

with (a := 0) as x: pass

with (a := 0, b := 1): pass

with (a := 0, b := 1) as x: pass

with (0 as a): pass

with (0 as a,): pass

with (0 as a, 1 as b): pass

with (0 as a, 1 as b,): pass

insta::assert_debug_snapshot!(ast::Suite::parse(source, "<test>").unwrap());

}

#[test]

fn test_with_statement_invalid() {

for source in [

"with 0,: pass",

"with 0 as x,: pass",

"with 0 as *x: pass",

"with *a: pass",

"with *a as x: pass",

"with (*a): pass",

"with (*a) as x: pass",

"with *a, 0 as x: pass",

"with (*a, 0 as x): pass",

"with 0 as x, *a: pass",

"with (0 as x, *a): pass",

"with (0 as x) as y: pass",

"with (0 as x), 1: pass",

"with ((0 as x)): pass",

"with a := 0 as x: pass",

"with (a := 0 as x): pass",

] {

assert!(ast::Suite::parse(source, "<test>").is_err());

}

#[test]

fn test_star_index() {

let source = "\

array_slice = array[0, *indexes, -1]

array[0, *indexes, -1] = array_slice

array[*indexes_to_select, *indexes_to_select]

array[3:5, *indexes_to_select]

let parse_ast = ast::Suite::parse(source, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

#[cfg(feature = "all-nodes-with-ranges")]

fn test_generator_expression_argument() {

let source = r#"' '.join(

sql

for sql in (

"LIMIT %d" % limit if limit else None,

("OFFSET %d" % offset) if offset else None,

)

)"#;

let parse_ast = ast::Expr::parse(source, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

fn test_try() {

let parse_ast = ast::Suite::parse(

r#"try:

raise ValueError(1)

except TypeError as e:

print(f'caught {type(e)}')

except OSError as e:

print(f'caught {type(e)}')"#,

"<test>",

)

.unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

fn test_try_star() {

let parse_ast = ast::Suite::parse(

r#"try:

raise ExceptionGroup("eg",

[ValueError(1), TypeError(2), OSError(3), OSError(4)])

except* TypeError as e:

print(f'caught {type(e)} with nested {e.exceptions}')

except* OSError as e:

print(f'caught {type(e)} with nested {e.exceptions}')"#,

"<test>",

)

.unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

fn test_dict_unpacking() {

let parse_ast = ast::Expr::parse(r#"{"a": "b", **c, "d": "e"}"#, "<test>").unwrap();

insta::assert_debug_snapshot!(parse_ast);

}

#[test]

fn test_modes() {

let source = "a[0][1][2][3][4]";

assert!(parse(source, Mode::Expression, "<embedded>").is_ok());

assert!(parse(source, Mode::Module, "<embedded>").is_ok());

assert!(parse(source, Mode::Interactive, "<embedded>").is_ok());

}

#[test]

#[cfg(feature = "all-nodes-with-ranges")]

fn test_parse_type_declaration() {

let source = r#"

type X = int

type X = int | str

type X = int | "ForwardRefY"

type X[T] = T | list[X[T]] # recursive

type X[T] = int

type X[T] = list[T] | set[T]

type X[T, *Ts, **P] = (T, Ts, P)

type X[T: int, *Ts, **P] = (T, Ts, P)

type X[T: (int, str), *Ts, **P] = (T, Ts, P)

# soft keyword as alias name

type type = int

type match = int

type case = int

# soft keyword as value

type foo = type

type foo = match

type foo = case

# multine definitions

type \

X = int

type X \

= int

type X = \

int

type X = (

int

)

type \

X[T] = T

type X \

[T] = T

type X[T] \

= T

"#;

insta::assert_debug_snapshot!(ast::Suite::parse(source, "<test>").unwrap());

}

#[test]

#[cfg(feature = "all-nodes-with-ranges")]

fn test_type_as_identifier() {

let source = r#"\

type *a + b, c # ((type * a) + b), c

type *(a + b), c # (type * (a + b)), c

type (*a + b, c) # type ((*(a + b)), c)

type -a * b + c # (type - (a * b)) + c

type -(a * b) + c # (type - (a * b)) + c

type (-a) * b + c # (type (-(a * b))) + c

type ().a # (type()).a

type (()).a # (type(())).a

type ((),).a # (type(())).a

type [a].b # (type[a]).b

type [a,].b # (type[(a,)]).b (not (type[a]).b)

type [(a,)].b # (type[(a,)]).b

type()[a:

b] # (type())[a: b]

if type := 1: pass

type = lambda query: query == event

print(type(12))

type(type)

a = (

type in C

)

a = (

type(b)

)

type (

X = int

)

type = 1

type = x = 1

x = type = 1

"#;

insta::assert_debug_snapshot!(ast::Suite::parse(source, "<test>").unwrap());

}

#[test]

#[cfg(feature = "all-nodes-with-ranges")]

fn test_match_as_identifier() {

let source = r#"\

match *a + b, c # ((match * a) + b), c

match *(a + b), c # (match * (a + b)), c

match (*a + b, c) # match ((*(a + b)), c)

match -a * b + c # (match - (a * b)) + c

match -(a * b) + c # (match - (a * b)) + c

match (-a) * b + c # (match (-(a * b))) + c

match ().a # (match()).a

match (()).a # (match(())).a

match ((),).a # (match(())).a

match [a].b # (match[a]).b

match [a,].b # (match[(a,)]).b (not (match[a]).b)

match [(a,)].b # (match[(a,)]).b

match()[a:

b] # (match())[a: b]

if match := 1: pass

match match:

case 1: pass

case 2:

View remainder of file in raw view

Parser/parser/src/parser.rs at main · RustPython/Parser · GitHub

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