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GDScript: Implement pattern guards for match statement

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Within a match statement, it is now possible to add guards in each
branch:

	var a = 0
	match a:
		0 when false: print("does not run")
		0 when true: print("but this does")

This allows more complex logic for deciding which branch to take.
This commit is contained in:
George Marques 2023-07-31 07:47:26 -03:00
parent ec62b8a3ee
commit 54a1414500
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GPG key ID: 046BD46A3201E43D
15 changed files with 163 additions and 1 deletions
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71
modules/gdscript/tests/scripts/runtime/features/match_with_pattern_guards.gd Normal file
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var global := 0
func test():
var a = 0
var b = 1
match a:
0 when b == 0:
print("does not run" if true else "")
0 when b == 1:
print("guards work")
_:
print("does not run")
match a:
var a_bind when b == 0:
prints("a is", a_bind, "and b is 0")
var a_bind when b == 1:
prints("a is", a_bind, "and b is 1")
_:
print("does not run")
match a:
var a_bind when a_bind < 0:
print("a is less than zero")
var a_bind when a_bind == 0:
print("a is equal to zero")
_:
print("a is more than zero")
match [1, 2, 3]:
[1, 2, var element] when element == 0:
print("does not run")
[1, 2, var element] when element == 3:
print("3rd element is 3")
match a:
_ when b == 0:
print("does not run")
_ when b == 1:
print("works with wildcard too.")
_:
print("does not run")
match a:
0, 1 when b == 0:
print("does not run")
0, 1 when b == 1:
print("guard with multiple patterns")
_:
print("does not run")
match a:
0 when b == 0:
print("does not run")
0:
print("regular pattern after guard mismatch")
match a:
1 when side_effect():
print("should not run the side effect call")
0 when side_effect():
print("will run the side effect call, but not this")
_:
assert(global == 1)
print("side effect only ran once")
func side_effect():
print("side effect")
global += 1
return false

10
modules/gdscript/tests/scripts/runtime/features/match_with_pattern_guards.out Normal file
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GDTEST_OK
guards work
a is 0 and b is 1
a is equal to zero
3rd element is 3
works with wildcard too.
guard with multiple patterns
regular pattern after guard mismatch
side effect
side effect only ran once