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"""Base semantic analyzer: AST -> NoteSequence IR."""
from dataclasses import dataclass, field
from .ast_nodes import (
ASTNode,
BarStmt,
DetuneStmt,
DutyStmt,
EnvelopeDefStmt,
ExtCmdStmt,
GateTimeStmt,
LengthStmt,
NoteStmt,
OctaveStmt,
Program,
RepeatEndStmt,
RepeatStartStmt,
RestStmt,
Statement,
TempoStmt,
TieStmt,
Track,
TransposeStmt,
VolumeStmt,
)
from .ir import (
ErrorCode,
ErrorDetail,
ErrorPhase,
NoteEvent,
NoteSequence,
RestEvent,
)
from .parser_base import length_value_to_ticks
@dataclass
class SemanticContext:
errors: list[ErrorDetail] = field(default_factory=list)
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,
phase=ErrorPhase.SEMANTIC,
line=line,
column=column,
message=message,
severity=severity,
hint=hint,
context=context,
)
)
class SemanticAnalyzer:
"""Base class for converting AST to NoteSequence IR."""
def __init__(self, source: str, program: Program) -> None:
self.source = source
self.program = program
self.ctx = SemanticContext()
self.note_sequence = NoteSequence()
self.current_channel: str | None = None
self.octave = 4
self.default_length = 4
self.velocity = 15
self.gate_time = 1.0
self.duty = 2
self.tick_position = 0
def analyze(self) -> tuple[NoteSequence, list[ErrorDetail]]:
for track in self.program.tracks:
self._analyze_track(track)
self._finalize()
return self.note_sequence, self.ctx.errors
def _analyze_track(self, track: Track) -> None:
self.current_channel = track.channel
self._reset_state(track)
if track.channel == "Loop":
self._handle_loop_track(track)
return
for stmt in track.statements:
self._analyze_statement(stmt)
def _reset_state(self, track: Track) -> None:
self.octave = 4
self.default_length = 4
self.velocity = 15
self.gate_time = 1.0
self.duty = 2
self.tick_position = 0
def _handle_loop_track(self, track: Track) -> None:
# Loop track is handled after all tracks are processed.
pass
def _finalize(self) -> None:
for ch in self.note_sequence.channels.values():
ch.total_ticks = max(
(e.tick_position + getattr(e, "duration", 0) for e in ch.events),
default=0,
)
def _analyze_statement(self, stmt: Statement) -> None:
if isinstance(stmt, NoteStmt):
self._analyze_note(stmt)
elif isinstance(stmt, RestStmt):
self._analyze_rest(stmt)
elif isinstance(stmt, OctaveStmt):
self._analyze_octave(stmt)
elif isinstance(stmt, LengthStmt):
self._analyze_length(stmt)
elif isinstance(stmt, VolumeStmt):
self._analyze_volume(stmt)
elif isinstance(stmt, DutyStmt):
self._analyze_duty(stmt)
elif isinstance(stmt, TempoStmt):
self._analyze_tempo(stmt)
elif isinstance(stmt, GateTimeStmt):
self._analyze_gate_time(stmt)
elif isinstance(stmt, TransposeStmt):
self._analyze_transpose(stmt)
elif isinstance(stmt, DetuneStmt):
self._analyze_detune(stmt)
elif isinstance(stmt, TieStmt):
self._analyze_tie(stmt)
elif isinstance(stmt, RepeatStartStmt):
self._analyze_repeat_start(stmt)
elif isinstance(stmt, RepeatEndStmt):
self._analyze_repeat_end(stmt)
elif isinstance(stmt, BarStmt):
pass
elif isinstance(stmt, ExtCmdStmt):
self._analyze_ext_cmd(stmt)
elif isinstance(stmt, EnvelopeDefStmt):
self._analyze_stage2(stmt)
else:
self._analyze_stage2(stmt)
def _ticks_for(self, stmt: NoteStmt | RestStmt) -> int:
length = stmt.length if stmt.length is not None else self.default_length
return length_value_to_ticks(length, stmt.dots)
def _analyze_note(self, stmt: NoteStmt) -> None:
raise NotImplementedError
def _analyze_rest(self, stmt: RestStmt) -> None:
raise NotImplementedError
def _analyze_octave(self, stmt: OctaveStmt) -> None:
raise NotImplementedError
def _analyze_length(self, stmt: LengthStmt) -> None:
raise NotImplementedError
def _analyze_volume(self, stmt: VolumeStmt) -> None:
raise NotImplementedError
def _analyze_duty(self, stmt: DutyStmt) -> None:
raise NotImplementedError
def _analyze_tempo(self, stmt: TempoStmt) -> None:
raise NotImplementedError
def _analyze_gate_time(self, stmt: GateTimeStmt) -> None:
raise NotImplementedError
def _analyze_tie(self, stmt: TieStmt) -> None:
raise NotImplementedError
def _analyze_repeat_start(self, stmt: RepeatStartStmt) -> None:
raise NotImplementedError
def _analyze_repeat_end(self, stmt: RepeatEndStmt) -> None:
raise NotImplementedError
def _analyze_ext_cmd(self, stmt: ExtCmdStmt) -> None:
raise NotImplementedError
def _analyze_stage2(self, stmt: ASTNode) -> None:
self.ctx.add_error(
code=ErrorCode.SEMANTIC_UNSUPPORTED_FEATURE,
line=stmt.line,
column=stmt.column,
message=f"'{stmt.__class__.__name__}' は第2段階で実装されます。",
severity="warning",
hint="現時点では無視されます。",
context=self._context_line(stmt),
)
def _add_event(self, event) -> None: # type: ignore[no-untyped-def]
ch = self.note_sequence.channels[self.current_channel] # type: ignore[index]
ch.events.append(event)
def _last_note_end(self) -> int:
ch = self.note_sequence.channels[self.current_channel] # type: ignore[index]
for ev in reversed(ch.events):
if isinstance(ev, (NoteEvent, RestEvent)):
return ev.tick_position + ev.duration
return self.tick_position
def _extend_last_note(self, ticks: int) -> None:
ch = self.note_sequence.channels[self.current_channel] # type: ignore[index]
for ev in reversed(ch.events):
if isinstance(ev, (NoteEvent, RestEvent)):
ev.duration += ticks
return
def _context_line(self, node: ASTNode) -> str:
lines = self.source.splitlines()
if 1 <= node.line <= len(lines):
return lines[node.line - 1]
return ""
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