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🐐 Better arrays

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NikolajDanger
2026-04-01 11:53:13 +02:00
parent 74ad338b63
commit b6de7befcd
4 changed files with 42 additions and 25 deletions
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10
README.md
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@@ -96,7 +96,13 @@ The base `CENTVRION` syntax does not allow for floats. However, the `FRACTIO` mo
Booleans are denoted with the keywords `VERITAS` for true and `FALSITAS` for false.
### Arrays
Arrays are defined using square brackets (`[]`) and commas (`,`). An array of integers can also be initialized with the `VSQVE` keyword:
Arrays are defined using square brackets (`[]`) and commas (`,`):
```
DESIGNA x VT [I, II, III]
```
An array of integers can also be initialized with the `VSQVE` keyword:
```
DESIGNA x VT [I VSQVE X]
@@ -105,7 +111,7 @@ DESIGNA x VT [I VSQVE X]
Individual elements can be accessed by index using square brackets. Indexing is 1-based, so `I` refers to the first element:
```
DESIGNA x VT [(I, II, III)]
DESIGNA x VT [I, II, III]
DICE(x[I])
> I

2
centvrion/ast_nodes.py
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@@ -163,7 +163,7 @@ class DataArray(Node):
def print(self):
items = ", ".join(i.print() for i in self.content)
return f"[({items})]"
return f"[{items}]"
def _eval(self, vtable):
vals = []

15
centvrion/parser.py
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@@ -138,6 +138,17 @@ class Parser():
else:
return [calls[0]] + calls[2]
@self.pg.production('array_items : ')
@self.pg.production('array_items : expression')
@self.pg.production('array_items : expression SYMBOL_COMMA array_items')
def array_items(calls):
if len(calls) == 0:
return []
elif len(calls) == 1:
return [calls[0]]
else:
return [calls[0]] + calls[2]
@self.pg.production('expression : id')
def expression_id(tokens):
return tokens[0]
@@ -187,7 +198,7 @@ class Parser():
def parens(tokens):
return tokens[1]
@self.pg.production('expression : SYMBOL_LBRACKET expressions SYMBOL_RBRACKET')
@self.pg.production('expression : SYMBOL_LBRACKET array_items SYMBOL_RBRACKET')
def array(tokens):
return ast_nodes.DataArray(tokens[1])
@@ -221,7 +232,7 @@ class Parser():
@self.pg.error
def error_handle(token):
raise SyntaxError(token.name, token.value, token.source_pos)
raise SyntaxError(f"{token.name}, {token.value}, {token.source_pos}")
parser = self.pg.build()
return parser.parse(tokens_input) # type: ignore

40
tests.py
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@@ -157,11 +157,11 @@ precedence_tests = [
Program([], [ExpressionStatement(BinOp(UnaryMinus(Numeral("II")), Numeral("III"), "SYMBOL_PLUS"))]),
ValInt(1)),
# INDEX binds tighter than UMINUS: -(arr[I]) = -1
("- [(I, II, III)][I]",
("- [I, II, III][I]",
Program([], [ExpressionStatement(UnaryMinus(ArrayIndex(DataArray([Numeral("I"), Numeral("II"), Numeral("III")]), Numeral("I"))))]),
ValInt(-1)),
# INDEX binds tighter than +: (arr[II]) + X = 2 + 10 = 12
("[(I, II, III)][II] + X",
("[I, II, III][II] + X",
Program([], [ExpressionStatement(BinOp(ArrayIndex(DataArray([Numeral("I"), Numeral("II"), Numeral("III")]), Numeral("II")), Numeral("X"), "SYMBOL_PLUS"))]),
ValInt(12)),
# left-associativity of -: (10-3)-2 = 5, not 10-(3-2) = 9
@@ -283,7 +283,7 @@ control_tests = [
]),
ValStr("I"), "I\n"),
# PER foreach
("PER i IN [(I, II, III)] FACE { DICE(i) }",
("PER i IN [I, II, III] FACE { DICE(i) }",
Program([], [PerStatement(DataArray([Numeral("I"), Numeral("II"), Numeral("III")]), ID("i"), [ExpressionStatement(BuiltIn("DICE", [ID("i")]))])]),
ValStr("III"), "I\nII\nIII\n"),
# DONICVM range loop
@@ -351,8 +351,8 @@ builtin_tests = [
("AVDI_NVMERVS()", Program([], [ExpressionStatement(BuiltIn("AVDI_NVMERVS", []))]), ValInt(10), "", ["X"]),
("CVM FORS\nFORTIS_NVMERVS(I, X)", Program([ModuleCall("FORS")], [ExpressionStatement(BuiltIn("FORTIS_NVMERVS", [Numeral("I"), Numeral("X")]))]), ValInt(3)),
("AVDI()", Program([], [ExpressionStatement(BuiltIn("AVDI", []))]), ValStr("hello"), "", ["hello"]),
("LONGITVDO([(I, II, III)])", Program([], [ExpressionStatement(BuiltIn("LONGITVDO", [DataArray([Numeral("I"), Numeral("II"), Numeral("III")])]))]), ValInt(3)),
("CVM FORS\nFORTIS_ELECTIONIS([(I, II, III)])", Program([ModuleCall("FORS")], [ExpressionStatement(BuiltIn("FORTIS_ELECTIONIS", [DataArray([Numeral("I"), Numeral("II"), Numeral("III")])]))]), ValInt(1)),
("LONGITVDO([I, II, III])", Program([], [ExpressionStatement(BuiltIn("LONGITVDO", [DataArray([Numeral("I"), Numeral("II"), Numeral("III")])]))]), ValInt(3)),
("CVM FORS\nFORTIS_ELECTIONIS([I, II, III])", Program([ModuleCall("FORS")], [ExpressionStatement(BuiltIn("FORTIS_ELECTIONIS", [DataArray([Numeral("I"), Numeral("II"), Numeral("III")])]))]), ValInt(1)),
]
class TestBuiltins(unittest.TestCase):
@@ -375,8 +375,8 @@ error_tests = [
("DEFINI f (x, y) VT { REDI(x) }\nINVOCA f (I)", TypeError), # too few args
("DEFINI f () VT { REDI(I) }\nINVOCA f (I)", TypeError), # args to zero-param function
("SI NVLLVS TVNC { DESIGNA r VT I }", TypeError), # NVLLVS cannot be used as boolean
("[(I, II)][III]", IndexError), # index too high
("[(I, II)][-I]", IndexError), # negative index
("[I, II][III]", IndexError), # index too high
("[I, II][-I]", IndexError), # negative index
]
class TestErrors(unittest.TestCase):
@@ -511,7 +511,7 @@ dice_type_tests = [
("DICE(VERITAS)", Program([], [ExpressionStatement(BuiltIn("DICE", [Bool(True)]))]), ValStr("VERVS"), "VERVS\n"),
("DICE(FALSITAS)", Program([], [ExpressionStatement(BuiltIn("DICE", [Bool(False)]))]), ValStr("FALSVS"), "FALSVS\n"),
("DICE(NVLLVS)", Program([], [ExpressionStatement(BuiltIn("DICE", [Nullus()]))]), ValStr("NVLLVS"), "NVLLVS\n"),
('DICE([(I, II)])', Program([], [ExpressionStatement(BuiltIn("DICE", [DataArray([Numeral("I"), Numeral("II")])]))]), ValStr("[I II]"), "[I II]\n"),
('DICE([I, II])', Program([], [ExpressionStatement(BuiltIn("DICE", [DataArray([Numeral("I"), Numeral("II")])]))]), ValStr("[I II]"), "[I II]\n"),
('DICE("")', Program([], [ExpressionStatement(BuiltIn("DICE", [String("")]))]), ValStr(""), "\n"),
# arithmetic result printed as numeral
("DICE(II + III)", Program([], [ExpressionStatement(BuiltIn("DICE", [BinOp(Numeral("II"), Numeral("III"), "SYMBOL_PLUS")]))]), ValStr("V"), "V\n"),
@@ -541,11 +541,11 @@ truthiness_tests = [
]),
ValInt(2)),
# non-empty list is truthy
("SI [(I)] TVNC { DESIGNA r VT I } ALVID { DESIGNA r VT II }\nr",
("SI [I] TVNC { DESIGNA r VT I } ALVID { DESIGNA r VT II }\nr",
Program([], [SiStatement(DataArray([Numeral("I")]), [Designa(ID("r"), Numeral("I"))], [Designa(ID("r"), Numeral("II"))]), ExpressionStatement(ID("r"))]),
ValInt(1)),
# empty list is falsy
("SI [()] TVNC { DESIGNA r VT II } ALVID { DESIGNA r VT I }\nr",
("SI [] TVNC { DESIGNA r VT II } ALVID { DESIGNA r VT I }\nr",
Program([], [SiStatement(DataArray([]), [Designa(ID("r"), Numeral("II"))], [Designa(ID("r"), Numeral("I"))]), ExpressionStatement(ID("r"))]),
ValInt(1)),
# DVM exits when condition becomes truthy
@@ -697,11 +697,11 @@ loop_edge_tests = [
Program([], [PerStatement(DataRangeArray(Numeral("III"), Numeral("III")), ID("i"), [ExpressionStatement(BuiltIn("DICE", [ID("i")]))])]),
ValNul(), ""),
# empty array — body never runs
("PER i IN [()] FACE { DICE(i) }",
("PER i IN [] FACE { DICE(i) }",
Program([], [PerStatement(DataArray([]), ID("i"), [ExpressionStatement(BuiltIn("DICE", [ID("i")]))])]),
ValNul(), ""),
# PER breaks on element 2 — last assigned i is 2
("PER i IN [(I, II, III)] FACE { SI i EST II TVNC { ERVMPE } }\ni",
("PER i IN [I, II, III] FACE { SI i EST II TVNC { ERVMPE } }\ni",
Program([], [
PerStatement(
DataArray([Numeral("I"), Numeral("II"), Numeral("III")]),
@@ -724,7 +724,7 @@ loop_edge_tests = [
ValInt(3), ""),
# nested PER: inner always breaks on first element; outer completes both iterations
# cnt starts at 1, increments twice → 3
("DESIGNA cnt VT I\nPER i IN [(I, II)] FACE {\nPER k IN [(I, II)] FACE {\nERVMPE\n}\nDESIGNA cnt VT cnt + I\n}\ncnt",
("DESIGNA cnt VT I\nPER i IN [I, II] FACE {\nPER k IN [I, II] FACE {\nERVMPE\n}\nDESIGNA cnt VT cnt + I\n}\ncnt",
Program([], [
Designa(ID("cnt"), Numeral("I")),
PerStatement(
@@ -864,11 +864,11 @@ class TestEtAvt(unittest.TestCase):
array_index_tests = [
# basic indexing
("[(I, II, III)][I]", Program([], [ExpressionStatement(ArrayIndex(DataArray([Numeral("I"), Numeral("II"), Numeral("III")]), Numeral("I")))]), ValInt(1)), # first element
("[(I, II, III)][II]", Program([], [ExpressionStatement(ArrayIndex(DataArray([Numeral("I"), Numeral("II"), Numeral("III")]), Numeral("II")))]), ValInt(2)), # second element
("[(I, II, III)][III]", Program([], [ExpressionStatement(ArrayIndex(DataArray([Numeral("I"), Numeral("II"), Numeral("III")]), Numeral("III")))]), ValInt(3)), # third element
("[I, II, III][I]", Program([], [ExpressionStatement(ArrayIndex(DataArray([Numeral("I"), Numeral("II"), Numeral("III")]), Numeral("I")))]), ValInt(1)), # first element
("[I, II, III][II]", Program([], [ExpressionStatement(ArrayIndex(DataArray([Numeral("I"), Numeral("II"), Numeral("III")]), Numeral("II")))]), ValInt(2)), # second element
("[I, II, III][III]", Program([], [ExpressionStatement(ArrayIndex(DataArray([Numeral("I"), Numeral("II"), Numeral("III")]), Numeral("III")))]), ValInt(3)), # third element
# index into a variable
("DESIGNA a VT [(X, XX, XXX)]\na[II]",
("DESIGNA a VT [X, XX, XXX]\na[II]",
Program([], [Designa(ID("a"), DataArray([Numeral("X"), Numeral("XX"), Numeral("XXX")])), ExpressionStatement(ArrayIndex(ID("a"), Numeral("II")))]),
ValInt(20)), # second element
# index into range array
@@ -944,7 +944,7 @@ scope_tests = [
]),
ValInt(5)),
# PER: loop variable holds last array element after loop (no ERVMPE)
("PER i IN [(I, II, III)] FACE { DESIGNA nop VT I }\ni",
("PER i IN [I, II, III] FACE { DESIGNA nop VT I }\ni",
Program([], [
PerStatement(DataArray([Numeral("I"), Numeral("II"), Numeral("III")]), ID("i"), [Designa(ID("nop"), Numeral("I"))]),
ExpressionStatement(ID("i")),
@@ -952,7 +952,7 @@ scope_tests = [
ValInt(3)),
# PER: reassigning loop var in body doesn't prevent remaining iterations from running
# cnt increments once per iteration (all 3); C=100 doesn't replace next element assignment
("DESIGNA cnt VT I\nPER i IN [(I, II, III)] FACE { DESIGNA i VT C\nDESIGNA cnt VT cnt + I }\ncnt",
("DESIGNA cnt VT I\nPER i IN [I, II, III] FACE { DESIGNA i VT C\nDESIGNA cnt VT cnt + I }\ncnt",
Program([], [
Designa(ID("cnt"), Numeral("I")),
PerStatement(DataArray([Numeral("I"), Numeral("II"), Numeral("III")]), ID("i"), [
@@ -964,7 +964,7 @@ scope_tests = [
ValInt(4)),
# PER: loop var after loop reflects the last body assignment, not the last array element
# body sets i=C=100 on every iteration; after loop ends, i stays at 100
("PER i IN [(I, II, III)] FACE { DESIGNA i VT C }\ni",
("PER i IN [I, II, III] FACE { DESIGNA i VT C }\ni",
Program([], [
PerStatement(DataArray([Numeral("I"), Numeral("II"), Numeral("III")]), ID("i"), [Designa(ID("i"), Numeral("C"))]),
ExpressionStatement(ID("i")),