175 lines
6.2 KiB
Python
175 lines
6.2 KiB
Python
import logging
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from os import remove
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import re
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from typing import Callable, List, Tuple
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from draw.Iinstruction import *
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class InterpreterError(Exception):
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pass
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class JavaSyntaxError(Exception):
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pass
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class ScopeNotFoundException(Exception):
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pass
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COMMENT_REGEX = r"""^//|^#|^COMMENT|^--"""
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REMOVE_KEYWORDS = [' ', "public", "private", "void", ';']
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WHILE_TAG = "solange " #german for 'while'. Change this depending on your language
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REPLACE = dict((re.escape(k), '') for k in REMOVE_KEYWORDS)
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remove_pattern = re.compile("|".join(REPLACE.keys()))
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logging.warn("""The Interpreter is WIP and cannot interpret classes or function definitions
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as those do not exist in Nass-Shneidermann Diagrams. A fix is in the making
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""")
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def replace_all_tags(org: str):
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return remove_pattern.sub(lambda m: REPLACE[re.escape(m.group(0))], org)
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def load_src(filepath: str) -> List[str]:
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lines: List[str] = []
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brace_open_count, brace_closed_count = 0,0
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try:
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with open(filepath, encoding="utf-8") as file:
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for _line in file:
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line = replace_all_tags(_line.strip())
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if line and not re.match(COMMENT_REGEX, line):
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lines.append(line)
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if line.__contains__('{'):
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brace_open_count += 1
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if line.__contains__('}'):
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brace_closed_count += 1
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except:
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raise FileNotFoundError(f"File {filepath} was not found!")
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if brace_open_count != brace_closed_count:
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raise JavaSyntaxError("Number of opened braces does not match number of closed ones. Program is ill-formed!")
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return lines
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def check_src(src: List[str], line_index: int, tag: str) -> bool:
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if line_index >= len(src):
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return False
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return src[line_index].__contains__(tag)
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def check_line_start(src: List[str], line_index: int, tag: str) -> bool:
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if line_index >= len(src):
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return False
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return src[line_index].startswith(tag)
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def get_next_occurence_of(src: List[str], start_idx:int, tag:str) -> int:
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"""Returns the index of the next occurence of tag in src from start_idx"""
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i = start_idx
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while i < len(src):
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if check_src(src, i, tag):
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break
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i += 1
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return i
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def get_scope_start_offset(src: List[str], i: int) -> int:
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if check_src(src, i, "{"):
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return 1
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elif check_src(src, i+1, "{"):
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return 2
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raise ScopeNotFoundException("Unable to find scope start. Is the program ill-formed?")
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def handle_while(line: str, src: List[str], i: int) -> Tuple[Iinstruction, int]:
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bracket_idx = line.rindex(')') # throws if while contruct is illformed
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instruction_txt = line[6:bracket_idx]
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brace_offset = get_scope_start_offset(src, i)
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child_instructions, i = get_instructions_in_scope(src, i+brace_offset)
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return while_instruction_front((WHILE_TAG + instruction_txt), child_instructions), i
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def handle_else(src: List[str], i: int) -> Tuple[List[Iinstruction], int]:
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brace_offset = get_scope_start_offset(src, i)
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return get_instructions_in_scope(src, i+brace_offset)
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def handle_if(line: str, src: List[str], i: int) -> Tuple[Iinstruction, int]:
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bracket_idx = line.rindex(')') # throws if the contruct is illformed
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instruction_txt = line[3:bracket_idx]
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brace_offset = get_scope_start_offset(src, i)
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true_instructions, i = get_instructions_in_scope(src, i+brace_offset)
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false_instructions = None
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#check for else statements
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if check_line_start(src, i, "}else"):
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logging.debug("found else construct in line: %i", i+1)
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false_instructions, i = handle_else(src, i)
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elif check_line_start(src, i+1, "else"):
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logging.debug("found else construct in line: %i", i+2)
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false_instructions, i = handle_else(src, i+1)
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return if_instruction(instruction_txt, true_instructions, false_instructions), i
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def handle_do_while(line: str, src: List[str], i: int) -> Tuple[Iinstruction, int]:
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brace_offset = get_scope_start_offset(src, i)
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child_instructions, i = get_instructions_in_scope(src, i+brace_offset)
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instruction_txt = None
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if check_line_start(src, i, "}while("):
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end_line = src[i]
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bracket_index = end_line.rindex(')') #throws if contruct id ill-formed
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instruction_txt = end_line[7:bracket_index]
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elif check_line_start(src, i+1, "while("):
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i += 1
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end_line = src[i]
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bracket_index = end_line.rindex(')')
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instruction_txt = end_line[6:bracket_index]
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else:
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raise JavaSyntaxError("Ill-formed do-while construct!")
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return while_instruction_back(instruction_txt, child_instructions), i
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def handle_instruction(line: str, src: List[str], i: int) -> Tuple[Iinstruction, int]:
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if line.startswith("while("):
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logging.debug("Found while construct in line: %i", i+1)
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return handle_while(line, src, i)
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elif line.startswith("if("):
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logging.debug("Found if construct in line: %i", i+1)
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return handle_if(line, src, i)
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elif line.startswith("do"):
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logging.debug("Found do-while construct in line: %i", i+1)
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return handle_do_while(line, src, i)
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else:
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logging.debug("found generic instruction in line %i", i+1)
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return generic_instruction(line), i
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def get_instructions_in_scope(src: List[str], start_idx: int = 0) -> Tuple[List[Iinstruction], int]:
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outer_scope: List[Iinstruction] = []
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i = start_idx
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while i < len(src):
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line = src[i]
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try:
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if check_src(src, i, "}"): #We exited this scope, return it
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break
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instruction, i = handle_instruction(line, src, i)
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outer_scope.append(instruction)
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except Exception as e:
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logging.error("Encountered error in line %i: %s", i+1, str(e))
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raise
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except:
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logging.fatal("Encountered unexpected error in line: %i", i+1)
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raise
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i += 1
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return outer_scope, i
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def load_instructions(filepath: str) -> List[Iinstruction]:
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src = load_src(filepath)
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instructions, i = get_instructions_in_scope(src)
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if i != len(src):
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raise InterpreterError("Unknown error during source interpretation! Unsupported language constructs or ill-formed source?")
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return instructions |