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"""Base parser utilities shared between ppmck and pyxel parsers."""
from dataclasses import dataclass
from .ir import ErrorCode, ErrorDetail
from .lexer import Token, TokenType
@dataclass
class ParserContext:
tokens: list[Token]
pos: int = 0
errors: list[ErrorDetail] = None # type: ignore[assignment]
def __post_init__(self) -> None:
if self.errors is None:
self.errors = []
def peek(self, offset: int = 0) -> Token:
idx = self.pos + offset
if idx >= len(self.tokens):
return self.tokens[-1]
return self.tokens[idx]
def advance(self) -> Token:
token = self.peek()
self.pos += 1
return token
def match(self, *types: TokenType) -> Token | None:
token = self.peek()
if token.type in types:
return self.advance()
return None
def expect(self, *types: TokenType) -> Token | None:
return self.match(*types)
def add_error(
self,
code: ErrorCode,
line: int,
column: int,
message: str,
severity: str,
hint: str = "",
context: str = "",
) -> None:
self.errors.append(
ErrorDetail(
code=code,
line=line,
column=column,
message=message,
severity=severity,
hint=hint,
context=context,
)
)
class ParserError(Exception):
pass
def length_value_to_ticks(length: int, dots: int, ticks_per_quarter: int = 192) -> int:
base = ticks_per_quarter * 4 // length
total = base
add = base
for _ in range(dots):
add //= 2
total += add
return total
NOTE_OFFSET = {
"c": 0,
"d": 2,
"e": 4,
"f": 5,
"g": 7,
"a": 9,
"b": 11,
}
def note_to_midi(note: str, octave: int, accidental: int = 0) -> int:
return (octave + 1) * 12 + NOTE_OFFSET[note] + accidental
def clamp(value: int, min_val: int, max_val: int) -> int:
return max(min_val, min(value, max_val))
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