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72 lines
3.1 KiB
72 lines
3.1 KiB
import re
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from slither.exceptions import SlitherException
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from ..utils.patches import create_patch
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class FormatPragma:
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# Indicates the recommended versions for replacement
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REPLACEMENT_VERSIONS = ["0.4.25", "0.5.3"]
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# group:
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# 0: ^ > >= < <= (optional)
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# 1: ' ' (optional)
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# 2: version number
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# 3: version number
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# 4: version number
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PATTERN = re.compile('(\^|>|>=|<|<=)?([ ]+)?(\d+)\.(\d+)\.(\d+)')
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@staticmethod
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def format(slither, patches, elements):
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versions_used = []
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for element in elements:
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versions_used.append(''.join(element['type_specific_fields']['directive'][1:]))
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solc_version_replace = FormatPragma.analyse_versions(versions_used)
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for element in elements:
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FormatPragma.create_patch(slither, patches, element['source_mapping']['filename_absolute'],
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element['source_mapping']['filename_relative'], solc_version_replace,
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element['source_mapping']['start'],
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element['source_mapping']['start'] + element['source_mapping']['length'])
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@staticmethod
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def analyse_versions(used_solc_versions):
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replace_solc_versions = list()
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for version in used_solc_versions:
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replace_solc_versions.append(FormatPragma.determine_solc_version_replacement(version))
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if not all(version == replace_solc_versions[0] for version in replace_solc_versions):
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raise SlitherException("Multiple incompatible versions!")
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else:
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return replace_solc_versions[0]
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@staticmethod
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def determine_solc_version_replacement(used_solc_version):
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versions = FormatPragma.PATTERN.findall(used_solc_version)
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if len(versions) == 1:
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version = versions[0]
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minor_version = '.'.join(version[2:])[2]
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if minor_version == '4':
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return "pragma solidity " + FormatPragma.REPLACEMENT_VERSIONS[0] + ';'
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elif minor_version == '5':
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return "pragma solidity " + FormatPragma.REPLACEMENT_VERSIONS[1] + ';'
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else:
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raise SlitherException("Unknown version!")
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elif len(versions) == 2:
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version_right = versions[1]
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minor_version_right = '.'.join(version_right[2:])[2]
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if minor_version_right == '4':
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return "pragma solidity " + FormatPragma.REPLACEMENT_VERSIONS[0] + ';'
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elif minor_version_right in ['5', '6']:
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return "pragma solidity " + FormatPragma.REPLACEMENT_VERSIONS[1] + ';'
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@staticmethod
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def create_patch(slither, patches, in_file, in_file_relative, pragma, 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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create_patch(patches,
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"pragma",
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in_file_relative,
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in_file,
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int(modify_loc_start),
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int(modify_loc_end),
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old_str_of_interest.decode('utf-8'),
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pragma)
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