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asl.py
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asl.py
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# Author: Hafez Irshaid <[email protected]>.
"""
The MIT License (MIT)
Copyright (c) 2022 Hafez Irshaid
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
##########################################################################################################################################
My Programming Language Block Diagram:
------------- ------------- ---------------- ---------------- ----------------
| | | | | | | | | |
------| Lexer |------| Parser |------| Compiler |------| Generator |------| Executor |------> Program Output
| | | | | | | | | | | | | | |
| ------------- | ------------- | ---------------- | ---------------- | ----------------
| | | | |
\ / \ / \ / \ / \ /
Input List of list of Execution List of
File tokens statements Tree Instructions
Classes Description:
Lexer: Converts code texts into meaningful lexemes to tokens
Parser: Convert list of tokens into statements and extract their attributes
Compiler: Compiles list of statements into execution tree
Generator: Converts execution tree into executable instructions list
Executor: Contains methods to execute list of instructions to produce program logical output
"""
import argparse
from runners.asl_runner import AslRunner
from exceptions.language_exception import SyntaxError, UnknownVariable
def main():
""" Main Function, calls modules Argument Parser, File Reader, Lexer,
Parser, Compiler, Generator, Executor to execute a given source code file
Args:
None
Returns:
None
"""
# Parse program argument
args_parser = argparse.ArgumentParser("Asl Programming Language Command Line version 1.0")
# Argument identifier: --filename or -f
# File name that contains source code to be executed.
args_parser.add_argument('-f', '--filename',
default='asl_files/negative_numbers.asl',
help='source file name',
nargs=argparse.OPTIONAL,
)
args = args_parser.parse_args()
filename = args.filename
# if file name not provided, raise exception
if not filename:
raise Exception(f"file {filename} does not exist")
# Read Text File and store in text string
code = ""
with open(filename) as file:
for line in file:
code += line
AslRunner().run(code)
if __name__ == "__main__":
try:
# Main function
main()
except:
raise
# except SyntaxError as e:
# # Syntax Error
# print(e)
# except UnknownVariable as e:
# # Unknown Variable
# print(e)
# except Exception as e:
# # Unhandled Exception
# print("Unhandled Internal Exception ", e)
# raise e