51 lines
1.1 KiB
Python
51 lines
1.1 KiB
Python
import tokens
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from parser import Parser
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class Runner:
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def __init__(self):
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self.macro_table = {}
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self.expr = None
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def exec_command(self, command: str):
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if command == "help":
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print("This is a help message.")
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# Apply a list of definitions
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def run(self, line: str):
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e = Parser.parse_line(line)
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if isinstance(e, tokens.macro_expression):
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if e.label in self.macro_table:
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raise NameError(f"Label {e.label} exists!")
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e.exp.bind_variables()
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self.macro_table[e.label] = e.exp
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elif isinstance(e, tokens.command):
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self.exec_command(e.name)
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else:
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e.bind_variables()
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self.expr = e
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outs = [str(e)]
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for i in range(300):
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r = self.expr.reduce(self.macro_table)
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self.expr = r.output
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s = str(r.output)
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p = s if len(s) < 100 else s[:97] + "..."
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#if s in outs:
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#print(p)
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#print("\nLoop detected, exiting.")
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#break
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if not r.was_reduced:
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print("\nCannot evaluate any further.")
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break
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print(f"Performed {i} {'operations' if i != 1 else 'operation'}.")
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return self.expr
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def run_lines(self, lines):
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for l in lines:
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self.run(l)
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