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[WIP] Introduce Structural Pattern Matching (Part1) #3427

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[WIP] Introduce Structural Pattern Matching (Part1) #3427

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@Snowapril Snowapril commented Nov 8, 2021 •
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This revision introduce structural pattern matching from cpython 3.10 which introduced in pep 634, 635, 636.

Simple example

(Syntax highlighting for it on github is not available yet 😂)

# point is an (x, y) tuple
match point:
    case (0, 0):
        print("Origin")
    case (0, y):
        print(f"Y={y}")
    case (x, 0):
        print(f"X={x}")
    case (x, y):
        print(f"X={x}, Y={y}")
    case _:
        raise ValueError("Not a point")

If possible, I want to separate PR to two PRs (syntax, semantic).

Python Documentation

@Snowapril Snowapril marked this pull request as draft Nov 8, 2021
Snowapril added 10 commits Nov 11, 2021
@Snowapril
Update ast.py to python 3.10
6fadac4 
Signed-off-by: snowapril <sinjihng@gmail.com>
@Snowapril
Copy pattern matching in Python.asdl from cpython3.10
78a7e9b 
Signed-off-by: snowapril <sinjihng@gmail.com>
@Snowapril
Auto-generate ast_gen & gen with asdl_rs.py
f6aa438 
Signed-off-by: snowapril <sinjihng@gmail.com>
@Snowapril
Add Match & Case tokens
48e3999 
Signed-off-by: snowapril <sinjihng@gmail.com>
@Snowapril
Add scanning Match and scan_pattern
9c62bf2 
Signed-off-by: snowapril <sinjihng@gmail.com>
@Snowapril
Add Match stmt compile (WIP)
48c1e7b 
Signed-off-by: snowapril <sinjihng@gmail.com>
@Snowapril
Add rules for match, case in lalrpop (WIP)
126f61f 
Signed-off-by: snowapril <sinjihng@gmail.com>
@Snowapril
Add test_patma.py from cpython 3.10
7d59709 
Signed-off-by: snowapril <sinjihng@gmail.com>
@Snowapril
Update collections.__init__.py to support pattern-matching
8d3d83f 
Signed-off-by: snowapril <sinjihng@gmail.com>
@Snowapril
Update dataclasses.py to support pattern-maching
60d4685 
Signed-off-by: snowapril <sinjihng@gmail.com>
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