lint_asn1.py 8.12 KB
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import logging

from asn1tools import parse_files, compile_dict, ParseError, CompileError
from glob import glob
from pathlib import Path
import string

from pprint import pprint
import functools

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import lintingexceptions

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moduleLevelTests = []
typeLevelTests = []
fileLevelTests = []


def lintingTest (testName, testKind, testDescription):
    def decorate (func):
        @functools.wraps(func)
        def wrapper(*args, **kwargs):
            logging.debug (f"    Running test {testName}")
            errors = func(*args, **kwargs)
            for error in errors:
                error['testName'] = testName
                error['testKind'] = testKind
                error['testDescription'] = testDescription
            return errors
        if (testKind == "type"):
            typeLevelTests.append(wrapper)
        if (testKind == "module"):
            moduleLevelTests.append(wrapper)
        if (testKind == "file"):
            fileLevelTests.append(wrapper)
        return wrapper
    return decorate



def formatFailure(f):
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    return f"{f['testName'] if f.get('testName') else 'Failure'}: {f['message']}"
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def appendFailure(failures, context, newFailure):
    combinedFailure = {**context, **newFailure}
    logging.info (f"Test Failure: {combinedFailure}")
    failures.append(combinedFailure)


#--------------------------------------------------------------------
# File level tests
#--------------------------------------------------------------------

@lintingTest(testName = "D.4.9", 
             testKind = "file", 
             testDescription = "Fields, tags, types and flags are space aligned")
def D41 (fileLines, context):
    errors = []
    for lineNumber, line in enumerate(fileLines):
        if '\t' in line:
            appendFailure(errors, context, { "line" : lineNumber,
                "message" : f"Line {lineNumber} contains tab characters"})
    return errors


@lintingTest(testName = "D.4.11", 
             testKind = "file", 
             testDescription = "Braces are given their own line")
def D41 (fileLines, context):
    errors = []
    for lineNumber, line in enumerate(fileLines):
        if ('{' in line and line.strip().replace(",","") != '{') or ('}' in line and line.strip().replace(",","") != '}'):
            if "itu-t(0)" in line: continue
            if "OBJECT IDENTIFIER" in line: continue
            if "RELATIVE-OID" in line: continue
            appendFailure(errors, context, { "line" : lineNumber + 1,
                "message" : f"Line {lineNumber + 1} contains a brace but also other characters ('{line}')"})
    return errors


#--------------------------------------------------------------------
# Module level tests
#--------------------------------------------------------------------

@lintingTest(testName = "D.4.1", 
             testKind = "module", 
             testDescription = "EXTENSIBILITY IMPLIED directive set")
def D41 (module, context):
    errors = []
    if (not ('extensibility-implied' in module.keys()) or (module['extensibility-implied'] == False)):
        appendFailure(errors, context, {"message" : "EXTENSIBILITY IMPLIED directive not set"})
    return errors


@lintingTest(testName = "D.4.2", 
             testKind = "module", 
             testDescription = "AUTOMATIC TAGS not used")
def D42(module, context):
    errors = []
    if (module['tags'] == 'AUTOMATIC'):
        appendFailure(errors, context, {"message" : "AUTOMATIC TAGS directive used"})
    return errors


#--------------------------------------------------------------------
# Type level tests
#--------------------------------------------------------------------

@lintingTest(testName = "D.3.4", 
             testKind = "type", 
             testDescription = "Field names only contain characters A-Z, a-z, 0-9")
def D34(t, context):
    if not 'members' in t.keys(): 
        logging.debug (f"      D34 ignoring {context['module']} '{context['type']}' as it has no members")
        return []
    errors = []
    for m in t['members']:
        logging.debug (f"      D34 checking member {m}")
        badLetters = list(set([letter for letter in m['name'] if not ((letter in string.ascii_letters) or (letter in string.digits)) ]))
        if len(badLetters) > 0:
            appendFailure (errors, context, { "field" : m['name'],
                "message" : f"Field '{m['name']}' contains disallowed characters {badLetters!r}"})
    return errors


@lintingTest(testName = "D.4.3", 
             testKind = "type", 
             testDescription = "Tag numbers start at zero")
def D43 (t, context):
    errors = []
    if (t['type'] == 'SEQUENCE') or (t['type'] == 'CHOICE'):
        if t['members'][0]['tag']['number'] != 1:
            appendFailure (errors, context, {"message" : f"Tag numbers for {context['type']} start at {t['members'][0]['tag']['number']}, not 1"})
    return errors


@lintingTest(testName = "D.4.4", 
             testKind = "type", 
             testDescription = "Enumerations start at zero")
def D44 (t, context):
    errors = []
    if t['type'] == 'ENUMERATED':
        if t['values'][0][1] != 1:
            appendFailure(errors, context, { "message" : f"Enumerations for {context['type']} start at {t['values'][0][1]}, not 1"})
    return errors


@lintingTest(testName = "D.4.5", 
             testKind = "type", 
             testDescription = "No anonymous types")
def checkD45 (t, context):
    if not 'members' in t: 
        logging.debug (f"      D45: No members in type {context['type']}, ignoring")
        return []
    errors = []
    for m in t['members']:
        if m['type'] in ['ENUMERATED','SEQUENCE','CHOICE', 'SET']:
            appendFailure(errors, context, { "field" : m['name'],
                "message" : f"Field '{m['name']}' in {context['type']} is an anonymous {m['type']}"})
    return errors






def lintASN1File (asnFile):
    errors = []
    context = {'file' : asnFile}
    try:
        logging.info ("Checking file {0}...".format(asnFile))
        with open(asnFile) as f:
            s = f.read().splitlines()
        for test in fileLevelTests:
            errors += test(s, context)
        d = parse_files(asnFile)
        for moduleName, module in d.items():
            logging.info ("  Checking module {0}".format(moduleName))            
            for test in moduleLevelTests:
                context['module'] = moduleName
                errors += test(module, context)
            for typeName, typeDef in module['types'].items():
                context['type'] = typeName
                context['module'] = moduleName
                for test in typeLevelTests:
                    errors += test(typeDef, context)
    except ParseError as ex:
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        appendFailure(errors, context, { "message" : "ParseError: {0}".format(ex)})
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        logging.error("ParseError: {0}".format(ex))
    return errors


def lintASN1Files (fileList):
    if len(fileList) == 0:
        logging.warning ("No files specified")
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        return {}
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    errorMap = {}
    logging.info("Checking files...")
    for f in fileList:
        errorMap[f] = lintASN1File(f)
    return errorMap


def lintAllASN1FilesInPath (path):
    globPattern = str(Path(path)) + '/*.asn1'
    logging.info("Searching: " + globPattern)
    schemaGlob = glob(globPattern, recursive=True)
    return lintASN1Files(schemaGlob)    

if __name__ == '__main__':
    result = lintAllASN1FilesInPath("./")
    totalErrors = 0
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    totalSuppressed = 0
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    print ("Drafting rule checks:")
    print ("-----------------------------")
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    for filename, results in result.items():
        errors = [r for r in results if not (formatFailure(r) in lintingexceptions.exceptedStrings)]
        suppressedErrors = [r for r in results if formatFailure(r) in lintingexceptions.exceptedStrings]
        print (f"{filename}: {'OK' if len(errors) == 0 else f'{len(errors)} errors detected'}")
        for error in errors:
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            print("  " + formatFailure(error))
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        for error in suppressedErrors:
            print(" (" + formatFailure(error) + " - suppressed)")
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        totalErrors += len(errors)
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        totalSuppressed += len(suppressedErrors)
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    print ("-----------------------------")
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    print (f"{totalErrors} non-compliances detected, {totalSuppressed} errors suppressed")
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    exit(totalErrors)