98 lines
2.4 KiB
Python
98 lines
2.4 KiB
Python
from prompt_toolkit.formatted_text import FormattedText
|
|
|
|
import tokens
|
|
from parser import Parser
|
|
import commands
|
|
from runstatus import RunStatus
|
|
from runstatus import MacroStatus
|
|
from runstatus import StopReason
|
|
from runstatus import ReduceStatus
|
|
from runstatus import CommandStatus
|
|
|
|
|
|
class Runner:
|
|
def __init__(self):
|
|
self.macro_table = {}
|
|
|
|
# Maximum amount of reductions.
|
|
# If None, no maximum is enforced.
|
|
self.reduction_limit: int | None = 300
|
|
|
|
def exec_command(self, command: str) -> CommandStatus:
|
|
if command in commands.commands:
|
|
return commands.run(command, self)
|
|
|
|
# Handle unknown commands
|
|
else:
|
|
return CommandStatus(
|
|
formatted_text = FormattedText([
|
|
("#FFFF00", f"Unknown command \"{command}\"")
|
|
])
|
|
)
|
|
|
|
|
|
def reduce_expression(self, expr: tokens.LambdaToken) -> ReduceStatus:
|
|
|
|
# Reduction Counter.
|
|
# We also count macro expansions,
|
|
# and subtract those from the final count.
|
|
i = 0
|
|
macro_expansions = 0
|
|
|
|
while (self.reduction_limit is None) or (i < self.reduction_limit):
|
|
r = expr.reduce(self.macro_table)
|
|
expr = r.output
|
|
|
|
# If we can't reduce this expression anymore,
|
|
# it's in beta-normal form.
|
|
if not r.was_reduced:
|
|
return ReduceStatus(
|
|
reduction_count = i - macro_expansions,
|
|
stop_reason = StopReason.BETA_NORMAL,
|
|
result = r.output
|
|
)
|
|
|
|
# Count reductions
|
|
i += 1
|
|
if r.reduction_type == tokens.ReductionType.MACRO_EXPAND:
|
|
macro_expansions += 1
|
|
|
|
return ReduceStatus(
|
|
reduction_count = i - macro_expansions,
|
|
stop_reason = StopReason.MAX_EXCEEDED,
|
|
result = r.output # type: ignore
|
|
)
|
|
|
|
|
|
# Apply a list of definitions
|
|
def run(self, line: str) -> RunStatus:
|
|
e = Parser.parse_line(line)
|
|
|
|
# If this line is a macro definition, save the macro.
|
|
if isinstance(e, tokens.macro_expression):
|
|
was_rewritten = e.label in self.macro_table
|
|
|
|
e.exp.bind_variables()
|
|
self.macro_table[e.label] = e.exp
|
|
|
|
return MacroStatus(
|
|
was_rewritten = was_rewritten,
|
|
macro_label = e.label
|
|
)
|
|
|
|
# If this line is a command, do the command.
|
|
elif isinstance(e, tokens.command):
|
|
return self.exec_command(e.name)
|
|
|
|
# If this line is a plain expression, reduce it.
|
|
elif isinstance(e, tokens.LambdaToken):
|
|
e.bind_variables()
|
|
return self.reduce_expression(e)
|
|
else:
|
|
raise TypeError(f"I don't know what to do with a {type(e)}")
|
|
|
|
|
|
def run_lines(self, lines: list[str]):
|
|
for l in lines:
|
|
self.run(l)
|