mirror of https://github.com/japl-lang/japl.git
74 lines
2.8 KiB
Python
74 lines
2.8 KiB
Python
from JAPL.lexer import Lexer
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from JAPL.meta.exceptions import ParseError, JAPLError
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from JAPL.resolver import Resolver
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from JAPL.parser import Parser
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from JAPL.interpreter import Interpreter
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class JAPL(object):
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"""Wrapper around JAPL's interpreter, lexer and parser"""
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interpreter = Interpreter()
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resolver = Resolver(interpreter)
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def run(self, file: str):
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"""Runs a file"""
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if not file:
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self.repl()
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else:
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try:
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with open(file) as source_file:
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source_code = source_file.read()
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lexer = Lexer(source_code)
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tokens = lexer.lex()
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parser = Parser(tokens)
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ast = parser.parse()
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self.resolver.resolve(ast)
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self.interpreter.interpret(ast)
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except FileNotFoundError:
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print(f"Error: '{file}', no such file or directory")
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except PermissionError:
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print(f"Error' '{file}', permission denied")
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except JAPLError as err:
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if len(err.args) == 2:
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message, token = err.args
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print(f"An exception occurred at line {token.line}, file '{file}' at '{token.lexeme}': {message}")
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else:
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print(f"An exception occurred, details below\n\n{err}")
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def repl(self):
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"""Starts an interactive REPL"""
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self.interpreter = Interpreter()
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print("[JAPL 0.1.1 - Interactive REPL]")
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while True:
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try:
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source = input(">>> ")
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except (EOFError, KeyboardInterrupt):
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print()
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else:
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if not source:
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continue
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lexer = Lexer(source)
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try:
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tokens = lexer.lex()
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except ParseError as err:
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print(f"\nAn exception occurred, details below\n\nParseError: {err.args[0]}")
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else:
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try:
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ast = Parser(tokens).parse()
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except ParseError as err:
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message, token = err.args
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print(f"An exception occurred at line {token.line} at '{token.lexeme}': {message}")
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else:
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try:
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self.resolver.resolve(ast)
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result = self.interpreter.interpret(ast)
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except JAPLError as error:
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token, message = error.args
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print(f"A runtime exception occurred at line {token.line} at '{token.lexeme}': {message}")
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else:
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if result is not None:
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print(repr(result))
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