126 lines
5.2 KiB
Python
126 lines
5.2 KiB
Python
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import re
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import json
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import pandas as pd
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def expand_udt_references(db_struct, udts):
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"""
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Recursively expand UDT references in the given DB structure using the UDT definitions.
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This function specifically expands fields designated as 'type' which reference UDTs.
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"""
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if isinstance(db_struct, dict):
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for key, value in list(db_struct.items()):
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if isinstance(value, dict):
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# Recurse into dictionaries
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expand_udt_references(value, udts)
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elif isinstance(value, str) and key == "type": # Only expand 'type' fields
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type_name = value.strip(
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'"'
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) # Remove quotes which may wrap UDT names with spaces
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if type_name in udts:
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# Replace the UDT reference with its definition, if it exists
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db_struct["fields"] = udts[
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type_name
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].copy() # Assume structure to insert is under 'fields'
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print(f"Expanded UDT '{type_name}' at field '{key}' ")
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elif isinstance(db_struct, list):
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for item in db_struct:
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expand_udt_references(item, udts)
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def handle_array_types(db_struct):
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"""
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Handle array types once all UDTs are expanded.
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This function modifies the structure in place.
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"""
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if isinstance(db_struct, dict):
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for key, value in list(db_struct.items()):
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if isinstance(value, dict):
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handle_array_types(value)
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elif isinstance(value, str):
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# Parsing array definitions, e.g., "Array[1..3] of Real"
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match = re.match(r"Array\[(\d+)\.\.(\d+)\] of (\w+)", value)
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if match:
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lower_bound, upper_bound, base_type = (
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int(match.group(1)),
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int(match.group(2)),
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match.group(3),
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)
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# Expand this field into multiple fields
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db_struct.pop(key) # Remove the original field
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for i in range(lower_bound, upper_bound + 1):
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db_struct[f"{key}_{i}"] = {"type": base_type, 'is_array_element': True}
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print(
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f"Expanded field '{key}' into array fields: {key}_{lower_bound} to {key}_{upper_bound} of type {base_type}"
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)
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type_sizes = {
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"Int": 2,
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"DInt": 4,
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"Word": 2,
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"Real": 4,
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"Bool": 2, # We'll adjust this dynamically based on context (1 byte if alone, 1 bit if grouped)
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"String": 1, # This will be multiplied by the specified size in brackets [n]
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}
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def calculate_offsets(db_struct, current_offset=0, parent=None):
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"""
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Recursively calculate byte offsets for each field in the DB structure considering special types.
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"""
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last_key_was_bool = False
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if isinstance(db_struct, dict):
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for key, value in list(db_struct.items()):
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if isinstance(value, dict):
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if "type" in value:
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type_name = value["type"]
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is_array_element = value.get('is_array_element', False)
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size = type_sizes.get(
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type_name, 0
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) # Default to 1 byte if type is not recognized
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if not is_array_element and current_offset % 2 != 0:
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current_offset += 1 # Align to the next even offset if it's not an array element
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# Special handling for String types
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if "String" in type_name:
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match = re.match(r"String\[(\d+)\]", type_name)
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if match:
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length = int(match.group(1))
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size = length + 2 # Account for null-termination and string length prefix
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else:
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size = type_sizes.get(type_name, 1) # Default to generic size if not an array
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# Adjusting Bool sizes based on grouping
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if type_name == "Bool":
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if last_key_was_bool: # This is a grouped bool
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size = 0.125 # One bit per Bool if grouped
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else:
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size = 2 # Bools use a full byte if not grouped
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last_key_was_bool = True
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else:
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last_key_was_bool = False
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value["offset"] = current_offset
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current_offset += size
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current_offset = calculate_offsets(
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value, current_offset, value
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) # Recurse into nested structs
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elif isinstance(db_struct, list):
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for item in db_struct:
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current_offset = calculate_offsets(item, current_offset, parent)
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return current_offset
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def expand_dbs(udts, dbs):
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"""
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Expand all UDT references in all DBs and then handle array types.
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"""
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for db_name, db_content in dbs.items():
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print(f"Expanding DB: {db_name}")
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expand_udt_references(db_content, udts)
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handle_array_types(db_content)
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calculate_offsets(db_content)
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print(f"Completed expansion for DB: {db_name}")
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