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Copy pathcomparable.rs
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1985 lines (1797 loc) · 63 KB
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//! An equivalent object hierarchy to the `RustPython` AST hierarchy, but with the
//! ability to compare expressions for equality (via [`Eq`] and [`Hash`]).
//!
//! Two [`ComparableExpr`]s are considered equal if the underlying AST nodes have the
//! same shape, ignoring trivia (e.g., parentheses, comments, and whitespace), the
//! location in the source code, and other contextual information (e.g., whether they
//! represent reads or writes, which is typically encoded in the Python AST).
//!
//! For example, in `[(a, b) for a, b in c]`, the `(a, b)` and `a, b` expressions are
//! considered equal, despite the former being parenthesized, and despite the former
//! being a write ([`ast::ExprContext::Store`]) and the latter being a read
//! ([`ast::ExprContext::Load`]).
//!
//! Similarly, `"a" "b"` and `"ab"` would be considered equal, despite the former being
//! an implicit concatenation of string literals, as these expressions are considered to
//! have the same shape in that they evaluate to the same value.
use crate as ast;
use crate::{ConstantValue, Expr, Number};
use std::borrow::Cow;
use std::hash::Hash;
#[derive(Debug, PartialEq, Eq, Hash, Copy, Clone)]
pub enum ComparableBoolOp {
And,
Or,
}
impl From<ast::BoolOp> for ComparableBoolOp {
fn from(op: ast::BoolOp) -> Self {
match op {
ast::BoolOp::And => Self::And,
ast::BoolOp::Or => Self::Or,
}
}
}
#[derive(Debug, PartialEq, Eq, Hash, Copy, Clone)]
pub enum ComparableOperator {
Add,
Sub,
Mult,
MatMult,
Div,
Mod,
Pow,
LShift,
RShift,
BitOr,
BitXor,
BitAnd,
FloorDiv,
}
impl From<ast::Operator> for ComparableOperator {
fn from(op: ast::Operator) -> Self {
match op {
ast::Operator::Add => Self::Add,
ast::Operator::Sub => Self::Sub,
ast::Operator::Mult => Self::Mult,
ast::Operator::MatMult => Self::MatMult,
ast::Operator::Div => Self::Div,
ast::Operator::Mod => Self::Mod,
ast::Operator::Pow => Self::Pow,
ast::Operator::LShift => Self::LShift,
ast::Operator::RShift => Self::RShift,
ast::Operator::BitOr => Self::BitOr,
ast::Operator::BitXor => Self::BitXor,
ast::Operator::BitAnd => Self::BitAnd,
ast::Operator::FloorDiv => Self::FloorDiv,
}
}
}
#[derive(Debug, PartialEq, Eq, Hash, Copy, Clone)]
pub enum ComparableUnaryOp {
Invert,
Not,
UAdd,
USub,
}
impl From<ast::UnaryOp> for ComparableUnaryOp {
fn from(op: ast::UnaryOp) -> Self {
match op {
ast::UnaryOp::Invert => Self::Invert,
ast::UnaryOp::Not => Self::Not,
ast::UnaryOp::UAdd => Self::UAdd,
ast::UnaryOp::USub => Self::USub,
}
}
}
#[derive(Debug, PartialEq, Eq, Hash, Copy, Clone)]
pub enum ComparableCmpOp {
Eq,
NotEq,
Lt,
LtE,
Gt,
GtE,
Is,
IsNot,
In,
NotIn,
}
impl From<ast::CmpOp> for ComparableCmpOp {
fn from(op: ast::CmpOp) -> Self {
match op {
ast::CmpOp::Eq => Self::Eq,
ast::CmpOp::NotEq => Self::NotEq,
ast::CmpOp::Lt => Self::Lt,
ast::CmpOp::LtE => Self::LtE,
ast::CmpOp::Gt => Self::Gt,
ast::CmpOp::GtE => Self::GtE,
ast::CmpOp::Is => Self::Is,
ast::CmpOp::IsNot => Self::IsNot,
ast::CmpOp::In => Self::In,
ast::CmpOp::NotIn => Self::NotIn,
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ComparableAlias<'a> {
name: &'a str,
asname: Option<&'a str>,
}
impl<'a> From<&'a ast::Alias> for ComparableAlias<'a> {
fn from(alias: &'a ast::Alias) -> Self {
Self {
name: alias.name.as_str(),
asname: alias.asname.as_deref(),
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ComparableWithItem<'a> {
context_expr: ComparableExpr<'a>,
optional_vars: Option<ComparableExpr<'a>>,
}
impl<'a> From<&'a ast::WithItem> for ComparableWithItem<'a> {
fn from(with_item: &'a ast::WithItem) -> Self {
Self {
context_expr: (&with_item.context_expr).into(),
optional_vars: with_item.optional_vars.as_ref().map(Into::into),
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ComparablePatternArguments<'a> {
patterns: Vec<ComparablePattern<'a>>,
keywords: Vec<ComparablePatternKeyword<'a>>,
}
impl<'a> From<&'a ast::PatternArguments> for ComparablePatternArguments<'a> {
fn from(parameters: &'a ast::PatternArguments) -> Self {
Self {
patterns: parameters.patterns.iter().map(Into::into).collect(),
keywords: parameters.keywords.iter().map(Into::into).collect(),
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ComparablePatternKeyword<'a> {
attr: &'a str,
pattern: ComparablePattern<'a>,
}
impl<'a> From<&'a ast::PatternKeyword> for ComparablePatternKeyword<'a> {
fn from(keyword: &'a ast::PatternKeyword) -> Self {
Self {
attr: keyword.attr.as_str(),
pattern: (&keyword.pattern).into(),
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct PatternMatchValue<'a> {
value: ComparableExpr<'a>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct PatternMatchSingleton {
value: ComparableSingleton,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct PatternMatchSequence<'a> {
patterns: Vec<ComparablePattern<'a>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct PatternMatchMapping<'a> {
keys: Vec<ComparableExpr<'a>>,
patterns: Vec<ComparablePattern<'a>>,
rest: Option<&'a str>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct PatternMatchClass<'a> {
cls: ComparableExpr<'a>,
arguments: ComparablePatternArguments<'a>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct PatternMatchStar<'a> {
name: Option<&'a str>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct PatternMatchAs<'a> {
pattern: Option<Box<ComparablePattern<'a>>>,
name: Option<&'a str>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct PatternMatchOr<'a> {
patterns: Vec<ComparablePattern<'a>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub enum ComparablePattern<'a> {
MatchValue(PatternMatchValue<'a>),
MatchSingleton(PatternMatchSingleton),
MatchSequence(PatternMatchSequence<'a>),
MatchMapping(PatternMatchMapping<'a>),
MatchClass(PatternMatchClass<'a>),
MatchStar(PatternMatchStar<'a>),
MatchAs(PatternMatchAs<'a>),
MatchOr(PatternMatchOr<'a>),
}
impl<'a> From<&'a ast::Pattern> for ComparablePattern<'a> {
fn from(pattern: &'a ast::Pattern) -> Self {
match pattern {
ast::Pattern::MatchValue(ast::PatternMatchValue { value, .. }) => {
Self::MatchValue(PatternMatchValue {
value: value.into(),
})
}
ast::Pattern::MatchSingleton(ast::PatternMatchSingleton { value, .. }) => {
Self::MatchSingleton(PatternMatchSingleton {
value: value.into(),
})
}
ast::Pattern::MatchSequence(ast::PatternMatchSequence { patterns, .. }) => {
Self::MatchSequence(PatternMatchSequence {
patterns: patterns.iter().map(Into::into).collect(),
})
}
ast::Pattern::MatchMapping(ast::PatternMatchMapping {
keys,
patterns,
rest,
..
}) => Self::MatchMapping(PatternMatchMapping {
keys: keys.iter().map(Into::into).collect(),
patterns: patterns.iter().map(Into::into).collect(),
rest: rest.as_deref(),
}),
ast::Pattern::MatchClass(ast::PatternMatchClass { cls, arguments, .. }) => {
Self::MatchClass(PatternMatchClass {
cls: cls.into(),
arguments: arguments.into(),
})
}
ast::Pattern::MatchStar(ast::PatternMatchStar { name, .. }) => {
Self::MatchStar(PatternMatchStar {
name: name.as_deref(),
})
}
ast::Pattern::MatchAs(ast::PatternMatchAs { pattern, name, .. }) => {
Self::MatchAs(PatternMatchAs {
pattern: pattern.as_ref().map(Into::into),
name: name.as_deref(),
})
}
ast::Pattern::MatchOr(ast::PatternMatchOr { patterns, .. }) => {
Self::MatchOr(PatternMatchOr {
patterns: patterns.iter().map(Into::into).collect(),
})
}
}
}
}
impl<'a> From<&'a Box<ast::Pattern>> for Box<ComparablePattern<'a>> {
fn from(pattern: &'a Box<ast::Pattern>) -> Self {
Box::new((pattern.as_ref()).into())
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ComparableMatchCase<'a> {
pattern: ComparablePattern<'a>,
guard: Option<ComparableExpr<'a>>,
body: Vec<ComparableStmt<'a>>,
}
impl<'a> From<&'a ast::MatchCase> for ComparableMatchCase<'a> {
fn from(match_case: &'a ast::MatchCase) -> Self {
Self {
pattern: (&match_case.pattern).into(),
guard: match_case.guard.as_ref().map(Into::into),
body: match_case.body.iter().map(Into::into).collect(),
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ComparableDecorator<'a> {
expression: ComparableExpr<'a>,
}
impl<'a> From<&'a ast::Decorator> for ComparableDecorator<'a> {
fn from(decorator: &'a ast::Decorator) -> Self {
Self {
expression: (&decorator.expression).into(),
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub enum ComparableSingleton {
None,
True,
False,
}
impl From<&ast::Singleton> for ComparableSingleton {
fn from(singleton: &ast::Singleton) -> Self {
match singleton {
ast::Singleton::None => Self::None,
ast::Singleton::True => Self::True,
ast::Singleton::False => Self::False,
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub enum ComparableNumber<'a> {
Int(&'a ast::Int),
Float(u64),
Complex { real: u64, imag: u64 },
}
impl<'a> From<&'a ast::Number> for ComparableNumber<'a> {
fn from(number: &'a ast::Number) -> Self {
match number {
ast::Number::Int(value) => Self::Int(value),
ast::Number::Float(value) => Self::Float(value.to_bits()),
ast::Number::Complex { real, imag } => Self::Complex {
real: real.to_bits(),
imag: imag.to_bits(),
},
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub enum ComparableConstantValue<'a> {
None,
Boolean(bool),
Str(&'a str),
Bytes(Cow<'a, [u8]>),
Integer(&'a str),
Tuple(Vec<Self>),
Frozenset(Vec<Self>),
Float(u64),
Complex { real: u64, imag: u64 },
Ellipsis,
}
impl<'a> From<&'a ConstantValue> for ComparableConstantValue<'a> {
fn from(value: &'a ConstantValue) -> Self {
match value {
ConstantValue::None => Self::None,
ConstantValue::Boolean(value) => Self::Boolean(*value),
ConstantValue::Str(value) => Self::Str(value),
ConstantValue::Bytes(value) => Self::Bytes(Cow::from(value.as_ref())),
ConstantValue::Integer(value) => Self::Integer(value),
ConstantValue::Tuple(elements) => {
Self::Tuple(elements.iter().map(Into::into).collect())
}
ConstantValue::Frozenset(elements) => {
Self::Frozenset(elements.iter().map(Into::into).collect())
}
ConstantValue::Float(value) => Self::Float(value.to_bits()),
ConstantValue::Complex { real, imag } => Self::Complex {
real: real.to_bits(),
imag: imag.to_bits(),
},
ConstantValue::Ellipsis => Self::Ellipsis,
}
}
}
#[derive(Debug, Default, PartialEq, Eq, Hash)]
pub struct ComparableArguments<'a> {
args: Vec<ComparableExpr<'a>>,
keywords: Vec<ComparableKeyword<'a>>,
}
impl<'a> From<&'a ast::Arguments> for ComparableArguments<'a> {
fn from(arguments: &'a ast::Arguments) -> Self {
Self {
args: arguments.args.iter().map(Into::into).collect(),
keywords: arguments.keywords.iter().map(Into::into).collect(),
}
}
}
impl<'a> From<&'a Box<ast::Arguments>> for ComparableArguments<'a> {
fn from(arguments: &'a Box<ast::Arguments>) -> Self {
(arguments.as_ref()).into()
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ComparableParameters<'a> {
posonlyargs: Vec<ComparableParameterWithDefault<'a>>,
args: Vec<ComparableParameterWithDefault<'a>>,
vararg: Option<ComparableParameter<'a>>,
kwonlyargs: Vec<ComparableParameterWithDefault<'a>>,
kwarg: Option<ComparableParameter<'a>>,
}
impl<'a> From<&'a ast::Parameters> for ComparableParameters<'a> {
fn from(parameters: &'a ast::Parameters) -> Self {
Self {
posonlyargs: parameters.posonlyargs.iter().map(Into::into).collect(),
args: parameters.args.iter().map(Into::into).collect(),
vararg: parameters.vararg.as_ref().map(Into::into),
kwonlyargs: parameters.kwonlyargs.iter().map(Into::into).collect(),
kwarg: parameters.kwarg.as_ref().map(Into::into),
}
}
}
impl<'a> From<&'a Box<ast::Parameters>> for ComparableParameters<'a> {
fn from(parameters: &'a Box<ast::Parameters>) -> Self {
(parameters.as_ref()).into()
}
}
impl<'a> From<&'a Box<ast::Parameter>> for ComparableParameter<'a> {
fn from(arg: &'a Box<ast::Parameter>) -> Self {
(arg.as_ref()).into()
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ComparableParameter<'a> {
arg: &'a str,
annotation: Option<Box<ComparableExpr<'a>>>,
}
impl<'a> From<&'a ast::Parameter> for ComparableParameter<'a> {
fn from(arg: &'a ast::Parameter) -> Self {
Self {
arg: arg.name.as_str(),
annotation: arg.annotation.as_ref().map(Into::into),
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ComparableParameterWithDefault<'a> {
def: ComparableParameter<'a>,
default: Option<ComparableExpr<'a>>,
}
impl<'a> From<&'a ast::ParameterWithDefault> for ComparableParameterWithDefault<'a> {
fn from(arg: &'a ast::ParameterWithDefault) -> Self {
Self {
def: (&arg.parameter).into(),
default: arg.default.as_ref().map(Into::into),
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ComparableKeyword<'a> {
arg: Option<&'a str>,
value: ComparableExpr<'a>,
}
impl<'a> From<&'a ast::Keyword> for ComparableKeyword<'a> {
fn from(keyword: &'a ast::Keyword) -> Self {
Self {
arg: keyword.arg.as_ref().map(ast::Identifier::as_str),
value: (&keyword.value).into(),
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ComparableComprehension<'a> {
target: ComparableExpr<'a>,
iter: ComparableExpr<'a>,
ifs: Vec<ComparableExpr<'a>>,
is_async: bool,
}
impl<'a> From<&'a ast::Comprehension> for ComparableComprehension<'a> {
fn from(comprehension: &'a ast::Comprehension) -> Self {
Self {
target: (&comprehension.target).into(),
iter: (&comprehension.iter).into(),
ifs: comprehension.ifs.iter().map(Into::into).collect(),
is_async: comprehension.is_async,
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExceptHandlerExceptHandler<'a> {
type_: Option<Box<ComparableExpr<'a>>>,
name: Option<&'a str>,
body: Vec<ComparableStmt<'a>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub enum ComparableExceptHandler<'a> {
ExceptHandler(ExceptHandlerExceptHandler<'a>),
}
impl<'a> From<&'a ast::ExceptHandler> for ComparableExceptHandler<'a> {
fn from(except_handler: &'a ast::ExceptHandler) -> Self {
let ast::ExceptHandler::ExceptHandler(ast::ExceptHandlerExceptHandler {
type_,
name,
body,
..
}) = except_handler;
Self::ExceptHandler(ExceptHandlerExceptHandler {
type_: type_.as_ref().map(Into::into),
name: name.as_deref(),
body: body.iter().map(Into::into).collect(),
})
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub enum ComparableInterpolatedStringElement<'a> {
Literal(Cow<'a, str>),
InterpolatedElement(InterpolatedElement<'a>),
}
/// Comparable wrapper for [`ast::DebugText`].
///
/// Compares the full debug text (leading + expression source + trailing) rather than only the
/// expression source, because whitespace is part of the f-string's runtime output: `f"{x =}"`
/// produces `"x =<value>"` while `f"{x=}"` produces `"x=<value>"`, making them distinct
/// `Literal` types.
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ComparableDebugText<'a> {
text: Cow<'a, str>,
}
impl<'a> From<&'a ast::DebugText> for ComparableDebugText<'a> {
fn from(debug_text: &'a ast::DebugText) -> Self {
// Normalizing newlines is safe because Python normalizes `\r\n` and `\r` to `\n`
// at compile time, so they produce identical runtime values.
Self {
text: normalize_newlines(debug_text.as_str()),
}
}
}
fn normalize_newlines(contents: &str) -> Cow<'_, str> {
if contents.contains('\r') {
Cow::Owned(contents.replace("\r\n", "\n").replace('\r', "\n"))
} else {
Cow::Borrowed(contents)
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct InterpolatedElement<'a> {
expression: ComparableExpr<'a>,
debug_text: Option<ComparableDebugText<'a>>,
conversion: ast::ConversionFlag,
format_spec: Option<Vec<ComparableInterpolatedStringElement<'a>>>,
}
impl<'a> From<&'a ast::InterpolatedStringElement> for ComparableInterpolatedStringElement<'a> {
fn from(interpolated_string_element: &'a ast::InterpolatedStringElement) -> Self {
match interpolated_string_element {
ast::InterpolatedStringElement::Literal(ast::InterpolatedStringLiteralElement {
value,
..
}) => Self::Literal(value.as_ref().into()),
ast::InterpolatedStringElement::Interpolation(formatted_value) => {
formatted_value.into()
}
}
}
}
impl<'a> From<&'a ast::InterpolatedElement> for InterpolatedElement<'a> {
fn from(interpolated_element: &'a ast::InterpolatedElement) -> Self {
let ast::InterpolatedElement {
expression,
debug_text,
conversion,
format_spec,
..
} = interpolated_element;
Self {
expression: (expression).into(),
debug_text: debug_text.as_ref().map(Into::into),
conversion: *conversion,
format_spec: format_spec
.as_ref()
.map(|spec| spec.elements.iter().map(Into::into).collect()),
}
}
}
impl<'a> From<&'a ast::InterpolatedElement> for ComparableInterpolatedStringElement<'a> {
fn from(interpolated_element: &'a ast::InterpolatedElement) -> Self {
Self::InterpolatedElement(interpolated_element.into())
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ComparableElifElseClause<'a> {
test: Option<ComparableExpr<'a>>,
body: Vec<ComparableStmt<'a>>,
}
impl<'a> From<&'a ast::ElifElseClause> for ComparableElifElseClause<'a> {
fn from(elif_else_clause: &'a ast::ElifElseClause) -> Self {
let ast::ElifElseClause {
range: _,
node_index: _,
test,
body,
..
} = elif_else_clause;
Self {
test: test.as_ref().map(Into::into),
body: body.iter().map(Into::into).collect(),
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub enum ComparableLiteral<'a> {
None,
Ellipsis,
Bool(&'a bool),
Str(Vec<ComparableStringLiteral<'a>>),
Bytes(Vec<ComparableBytesLiteral<'a>>),
Number(ComparableNumber<'a>),
}
impl<'a> From<ast::LiteralExpressionRef<'a>> for ComparableLiteral<'a> {
fn from(literal: ast::LiteralExpressionRef<'a>) -> Self {
match literal {
ast::LiteralExpressionRef::NoneLiteral(_) => Self::None,
ast::LiteralExpressionRef::EllipsisLiteral(_) => Self::Ellipsis,
ast::LiteralExpressionRef::BooleanLiteral(ast::ExprBooleanLiteral {
value, ..
}) => Self::Bool(value),
ast::LiteralExpressionRef::StringLiteral(ast::ExprStringLiteral { value, .. }) => {
Self::Str(value.iter().map(Into::into).collect())
}
ast::LiteralExpressionRef::BytesLiteral(ast::ExprBytesLiteral { value, .. }) => {
Self::Bytes(value.iter().map(Into::into).collect())
}
ast::LiteralExpressionRef::NumberLiteral(ast::ExprNumberLiteral { value, .. }) => {
Self::Number(value.into())
}
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ComparableFString<'a> {
elements: Box<[ComparableInterpolatedStringElement<'a>]>,
}
impl<'a> From<&'a ast::FStringValue> for ComparableFString<'a> {
// The approach below is somewhat complicated, so it may
// require some justification.
//
// Suppose given an f-string of the form
// `f"{foo!r} one" " and two " f" and three {bar!s}"`
// This decomposes as:
// - An `FStringPart::FString`, `f"{foo!r} one"` with elements
// - `FStringElement::Expression` encoding `{foo!r}`
// - `FStringElement::Literal` encoding " one"
// - An `FStringPart::Literal` capturing `" and two "`
// - An `FStringPart::FString`, `f" and three {bar!s}"` with elements
// - `FStringElement::Literal` encoding " and three "
// - `FStringElement::Expression` encoding `{bar!s}`
//
// We would like to extract from this a vector of (comparable) f-string
// _elements_ which alternate between expression elements and literal
// elements. In order to do so, we need to concatenate adjacent string
// literals. String literals may be separated for two reasons: either
// they appear in adjacent string literal parts, or else a string literal
// part is adjacent to a string literal _element_ inside of an f-string part.
fn from(value: &'a ast::FStringValue) -> Self {
#[derive(Default)]
struct Collector<'a> {
elements: Vec<ComparableInterpolatedStringElement<'a>>,
}
impl<'a> Collector<'a> {
// The logic for concatenating adjacent string literals
// occurs here, implicitly: when we encounter a sequence
// of string literals, the first gets pushed to the
// `elements` vector, while subsequent strings
// are concatenated onto this top string.
fn push_literal(&mut self, literal: &'a str) {
if let Some(ComparableInterpolatedStringElement::Literal(existing_literal)) =
self.elements.last_mut()
{
existing_literal.to_mut().push_str(literal);
} else {
self.elements
.push(ComparableInterpolatedStringElement::Literal(literal.into()));
}
}
fn push_expression(&mut self, expression: &'a ast::InterpolatedElement) {
self.elements.push(expression.into());
}
}
let mut collector = Collector::default();
for part in value {
match part {
ast::FStringPart::Literal(string_literal) => {
collector.push_literal(&string_literal.value);
}
ast::FStringPart::FString(fstring) => {
for element in &fstring.elements {
match element {
ast::InterpolatedStringElement::Literal(literal) => {
collector.push_literal(&literal.value);
}
ast::InterpolatedStringElement::Interpolation(expression) => {
collector.push_expression(expression);
}
}
}
}
}
}
Self {
elements: collector.elements.into_boxed_slice(),
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ComparableTString<'a> {
strings: Box<[ComparableInterpolatedStringElement<'a>]>,
interpolations: Box<[InterpolatedElement<'a>]>,
}
impl<'a> From<&'a ast::TStringValue> for ComparableTString<'a> {
// We model a [`ComparableTString`] on the actual
// [CPython implementation] of a `string.templatelib.Template` object.
//
// As in CPython, we must be careful to ensure that the length
// of `strings` is always one more than the length of `interpolations` -
// that way we can recover the original reading order by interleaving
// starting with `strings`. This is how we can tell the
// difference between, e.g. `t"{foo}bar"` and `t"bar{foo}"`.
//
// - [CPython implementation](https://github.com/python/cpython/blob/c91ad5da9d92eac4718e4da8d53689c3cc24535e/Python/codegen.c#L4052-L4103)
fn from(value: &'a ast::TStringValue) -> Self {
struct Collector<'a> {
strings: Vec<ComparableInterpolatedStringElement<'a>>,
interpolations: Vec<InterpolatedElement<'a>>,
}
impl Default for Collector<'_> {
fn default() -> Self {
Self {
strings: vec![ComparableInterpolatedStringElement::Literal("".into())],
interpolations: vec![],
}
}
}
impl<'a> Collector<'a> {
// The logic for concatenating adjacent string literals
// occurs here, implicitly: when we encounter a sequence
// of string literals, the first gets pushed to the
// `strings` vector, while subsequent strings
// are concatenated onto this top string.
fn push_literal(&mut self, literal: &'a str) {
if let Some(ComparableInterpolatedStringElement::Literal(existing_literal)) =
self.strings.last_mut()
{
existing_literal.to_mut().push_str(literal);
} else {
self.strings
.push(ComparableInterpolatedStringElement::Literal(literal.into()));
}
}
fn start_new_literal(&mut self) {
self.strings
.push(ComparableInterpolatedStringElement::Literal("".into()));
}
fn push_tstring_interpolation(&mut self, expression: &'a ast::InterpolatedElement) {
self.interpolations.push(expression.into());
self.start_new_literal();
}
}
let mut collector = Collector::default();
for element in value.elements() {
match element {
ast::InterpolatedStringElement::Literal(literal) => {
collector.push_literal(&literal.value);
}
ast::InterpolatedStringElement::Interpolation(interpolation) => {
collector.push_tstring_interpolation(interpolation);
}
}
}
Self {
strings: collector.strings.into_boxed_slice(),
interpolations: collector.interpolations.into_boxed_slice(),
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ComparableStringLiteral<'a> {
value: &'a str,
}
impl<'a> From<&'a ast::StringLiteral> for ComparableStringLiteral<'a> {
fn from(string_literal: &'a ast::StringLiteral) -> Self {
Self {
value: &string_literal.value,
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ComparableBytesLiteral<'a> {
value: Cow<'a, [u8]>,
}
impl<'a> From<&'a ast::BytesLiteral> for ComparableBytesLiteral<'a> {
fn from(bytes_literal: &'a ast::BytesLiteral) -> Self {
Self {
value: Cow::Borrowed(&bytes_literal.value),
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExprBoolOp<'a> {
op: ComparableBoolOp,
values: Vec<ComparableExpr<'a>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExprNamed<'a> {
target: Box<ComparableExpr<'a>>,
value: Box<ComparableExpr<'a>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExprBinOp<'a> {
left: Box<ComparableExpr<'a>>,
op: ComparableOperator,
right: Box<ComparableExpr<'a>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExprUnaryOp<'a> {
op: ComparableUnaryOp,
operand: Box<ComparableExpr<'a>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExprLambda<'a> {
parameters: Option<ComparableParameters<'a>>,
body: Box<ComparableExpr<'a>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExprIf<'a> {
test: Box<ComparableExpr<'a>>,
body: Box<ComparableExpr<'a>>,
orelse: Box<ComparableExpr<'a>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ComparableDictItem<'a> {
key: Option<ComparableExpr<'a>>,
value: ComparableExpr<'a>,
}
impl<'a> From<&'a ast::DictItem> for ComparableDictItem<'a> {
fn from(ast::DictItem { key, value }: &'a ast::DictItem) -> Self {
Self {
key: key.as_ref().map(ComparableExpr::from),
value: value.into(),
}
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExprDict<'a> {
items: Vec<ComparableDictItem<'a>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExprSet<'a> {
elts: Vec<ComparableExpr<'a>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExprListComp<'a> {
elt: Box<ComparableExpr<'a>>,
generators: Vec<ComparableComprehension<'a>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExprSetComp<'a> {
elt: Box<ComparableExpr<'a>>,
generators: Vec<ComparableComprehension<'a>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExprDictComp<'a> {
key: Option<Box<ComparableExpr<'a>>>,
value: Box<ComparableExpr<'a>>,
generators: Vec<ComparableComprehension<'a>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExprGenerator<'a> {
elt: Box<ComparableExpr<'a>>,
generators: Vec<ComparableComprehension<'a>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExprAwait<'a> {
value: Box<ComparableExpr<'a>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExprYield<'a> {
value: Option<Box<ComparableExpr<'a>>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExprYieldFrom<'a> {
value: Box<ComparableExpr<'a>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExprCompare<'a> {
left: Box<ComparableExpr<'a>>,
ops: Vec<ComparableCmpOp>,
comparators: Vec<ComparableExpr<'a>>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExprCall<'a> {
func: Box<ComparableExpr<'a>>,
arguments: ComparableArguments<'a>,
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct ExprInterpolatedElement<'a> {
value: Box<ComparableExpr<'a>>,
debug_text: Option<ComparableDebugText<'a>>,
conversion: ast::ConversionFlag,
format_spec: Vec<ComparableInterpolatedStringElement<'a>>,
}