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Split Constant to individual literal nodes (#8064)

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## Summary

This PR splits the `Constant` enum as individual literal nodes. It
introduces the following new nodes for each variant:
* `ExprStringLiteral`
* `ExprBytesLiteral`
* `ExprNumberLiteral`
* `ExprBooleanLiteral`
* `ExprNoneLiteral`
* `ExprEllipsisLiteral`

The main motivation behind this refactor is to introduce the new AST
node for implicit string concatenation in the coming PR. The elements of
that node will be either a string literal, bytes literal or a f-string
which can be implemented using an enum. This means that a string or
bytes literal cannot be represented by `Constant::Str` /
`Constant::Bytes` which creates an inconsistency.

This PR avoids that inconsistency by splitting the constant nodes into
it's own literal nodes, literal being the more appropriate naming
convention from a static analysis tool perspective.

This also makes working with literals in the linter and formatter much
more ergonomic like, for example, if one would want to check if this is
a string literal, it can be done easily using
`Expr::is_string_literal_expr` or matching against `Expr::StringLiteral`
as oppose to matching against the `ExprConstant` and enum `Constant`. A
few AST helper methods can be simplified as well which will be done in a
follow-up PR.

This introduces a new `Expr::is_literal_expr` method which is the same
as `Expr::is_constant_expr`. There are also intermediary changes related
to implicit string concatenation which are quiet less. This is done so
as to avoid having a huge PR which this already is.

## Test Plan

1. Verify and update all of the existing snapshots (parser, visitor)
2. Verify that the ecosystem check output remains **unchanged** for both
the linter and formatter

### Formatter ecosystem check

#### `main`

| project | similarity index | total files | changed files |

|----------------|------------------:|------------------:|------------------:|
| cpython | 0.75803 | 1799 | 1647 |
| django | 0.99983 | 2772 | 34 |
| home-assistant | 0.99953 | 10596 | 186 |
| poetry | 0.99891 | 317 | 17 |
| transformers | 0.99966 | 2657 | 330 |
| twine | 1.00000 | 33 | 0 |
| typeshed | 0.99978 | 3669 | 20 |
| warehouse | 0.99977 | 654 | 13 |
| zulip | 0.99970 | 1459 | 22 |

#### `dhruv/constant-to-literal`

| project | similarity index | total files | changed files |

|----------------|------------------:|------------------:|------------------:|
| cpython | 0.75803 | 1799 | 1647 |
| django | 0.99983 | 2772 | 34 |
| home-assistant | 0.99953 | 10596 | 186 |
| poetry | 0.99891 | 317 | 17 |
| transformers | 0.99966 | 2657 | 330 |
| twine | 1.00000 | 33 | 0 |
| typeshed | 0.99978 | 3669 | 20 |
| warehouse | 0.99977 | 654 | 13 |
| zulip | 0.99970 | 1459 | 22 |
This commit is contained in:
Dhruv Manilawala 2023-10-30 12:13:23 +05:30 • committed by GitHub
parent 78bbf6d403
commit 230c9ce236
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268 changed files with 6663 additions and 6741 deletions
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10
crates/ruff_python_formatter/src/expression/expr_compare.rs
View file

@ -1,10 +1,10 @@
use ruff_formatter::{FormatOwnedWithRule, FormatRefWithRule};
use ruff_python_ast::AnyNodeRef;
use ruff_python_ast::{CmpOp, Expr, ExprCompare};
use ruff_python_ast::{CmpOp, ExprCompare};
use crate::comments::SourceComment;
use crate::expression::binary_like::BinaryLike;
use crate::expression::expr_constant::is_multiline_string;
use crate::expression::expr_string_literal::is_multiline_string;
use crate::expression::has_parentheses;
use crate::expression::parentheses::{NeedsParentheses, OptionalParentheses};
use crate::prelude::*;
@ -37,10 +37,10 @@ impl NeedsParentheses for ExprCompare {
) -> OptionalParentheses {
if parent.is_expr_await() {
OptionalParentheses::Always
} else if let Expr::Constant(constant) = self.left.as_ref() {
} else if self.left.is_literal_expr() {
// Multiline strings are guaranteed to never fit, avoid adding unnecessary parentheses
if !constant.value.is_implicit_concatenated()
&& is_multiline_string(constant, context.source())
if !self.left.is_implicit_concatenated_string()
&& is_multiline_string(self.left.as_ref().into(), context.source())
&& !context.comments().has(self.left.as_ref())
&& self.comparators.first().is_some_and(|right| {
has_parentheses(right, context).is_some() && !context.comments().has(right)