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46 lines
2.4 KiB
46 lines
2.4 KiB
import re
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from ..utils.patches import create_patch
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def format(slither, patches, elements):
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for element in elements:
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target_contract = slither.get_contract_from_name(element['type_specific_fields']['parent']['name'])
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if target_contract:
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for function in target_contract.functions:
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if function.name == element['name']:
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_patch(slither, patches,
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element['source_mapping']['filename_absolute'],
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element['source_mapping']['filename_relative'],
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int(function.parameters_src.source_mapping['start']),
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int(function.returns_src.source_mapping['start']))
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break
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def _patch(slither, patches, in_file, in_file_relative, modify_loc_start, modify_loc_end):
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in_file_str = slither.source_code[in_file].encode('utf-8')
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old_str_of_interest = in_file_str[modify_loc_start:modify_loc_end]
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# Search for 'public' keyword which is in-between the function name and modifier name (if present)
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# regex: 'public' could have spaces around or be at the end of the line
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m = re.search(r'((\spublic)\s+)|(\spublic)$|(\)public)$', old_str_of_interest.decode('utf-8'))
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if m is None:
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# No visibility specifier exists; public by default.
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create_patch(patches,
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"external-function",
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in_file_relative,
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in_file,
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# start after the function definition's closing paranthesis
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modify_loc_start + len(old_str_of_interest.decode('utf-8').split(')')[0]) + 1,
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# end is same as start because we insert the keyword `external` at that location
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modify_loc_start + len(old_str_of_interest.decode('utf-8').split(')')[0]) + 1,
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"",
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" external") # replace_text is `external`
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else:
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create_patch(patches,
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"external-function",
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in_file_relative,
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in_file,
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# start at the keyword `public`
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modify_loc_start + m.span()[0] + 1,
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# end after the keyword `public` = start + len('public'')
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modify_loc_start + m.span()[0] + 1 + 6,
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" public",
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" external")
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