diff options
Diffstat (limited to 'coverage/parser.py')
| -rw-r--r-- | coverage/parser.py | 153 |
1 files changed, 77 insertions, 76 deletions
diff --git a/coverage/parser.py b/coverage/parser.py index 7a468e39..3b25b943 100644 --- a/coverage/parser.py +++ b/coverage/parser.py @@ -315,6 +315,83 @@ class PythonParser(object): return description + +class ByteParser(object): + """Parse bytecode to understand the structure of code.""" + + @contract(text='unicode') + def __init__(self, text, code=None, filename=None): + self.text = text + if code: + self.code = code + else: + try: + self.code = compile_unicode(text, filename, "exec") + except SyntaxError as synerr: + raise NotPython( + u"Couldn't parse '%s' as Python source: '%s' at line %d" % ( + filename, synerr.msg, synerr.lineno + ) + ) + + # Alternative Python implementations don't always provide all the + # attributes on code objects that we need to do the analysis. + for attr in ['co_lnotab', 'co_firstlineno', 'co_consts']: + if not hasattr(self.code, attr): + raise CoverageException( + "This implementation of Python doesn't support code analysis.\n" + "Run coverage.py under CPython for this command." + ) + + def child_parsers(self): + """Iterate over all the code objects nested within this one. + + The iteration includes `self` as its first value. + + """ + children = CodeObjects(self.code) + return (ByteParser(self.text, code=c) for c in children) + + def _bytes_lines(self): + """Map byte offsets to line numbers in `code`. + + Uses co_lnotab described in Python/compile.c to map byte offsets to + line numbers. Produces a sequence: (b0, l0), (b1, l1), ... + + Only byte offsets that correspond to line numbers are included in the + results. + + """ + # Adapted from dis.py in the standard library. + byte_increments = bytes_to_ints(self.code.co_lnotab[0::2]) + line_increments = bytes_to_ints(self.code.co_lnotab[1::2]) + + last_line_num = None + line_num = self.code.co_firstlineno + byte_num = 0 + for byte_incr, line_incr in zip(byte_increments, line_increments): + if byte_incr: + if line_num != last_line_num: + yield (byte_num, line_num) + last_line_num = line_num + byte_num += byte_incr + line_num += line_incr + if line_num != last_line_num: + yield (byte_num, line_num) + + def _find_statements(self): + """Find the statements in `self.code`. + + Produce a sequence of line numbers that start statements. Recurses + into all code objects reachable from `self.code`. + + """ + for bp in self.child_parsers(): + # Get all of the lineno information from this code. + for _, l in bp._bytes_lines(): + yield l + + # # AST analysis # @@ -829,82 +906,6 @@ class AstArcAnalyzer(object): _code_object__ListComp = _make_oneline_code_method("list comprehension") -class ByteParser(object): - """Parse bytecode to understand the structure of code.""" - - @contract(text='unicode') - def __init__(self, text, code=None, filename=None): - self.text = text - if code: - self.code = code - else: - try: - self.code = compile_unicode(text, filename, "exec") - except SyntaxError as synerr: - raise NotPython( - u"Couldn't parse '%s' as Python source: '%s' at line %d" % ( - filename, synerr.msg, synerr.lineno - ) - ) - - # Alternative Python implementations don't always provide all the - # attributes on code objects that we need to do the analysis. - for attr in ['co_lnotab', 'co_firstlineno', 'co_consts']: - if not hasattr(self.code, attr): - raise CoverageException( - "This implementation of Python doesn't support code analysis.\n" - "Run coverage.py under CPython for this command." - ) - - def child_parsers(self): - """Iterate over all the code objects nested within this one. - - The iteration includes `self` as its first value. - - """ - children = CodeObjects(self.code) - return (ByteParser(self.text, code=c) for c in children) - - def _bytes_lines(self): - """Map byte offsets to line numbers in `code`. - - Uses co_lnotab described in Python/compile.c to map byte offsets to - line numbers. Produces a sequence: (b0, l0), (b1, l1), ... - - Only byte offsets that correspond to line numbers are included in the - results. - - """ - # Adapted from dis.py in the standard library. - byte_increments = bytes_to_ints(self.code.co_lnotab[0::2]) - line_increments = bytes_to_ints(self.code.co_lnotab[1::2]) - - last_line_num = None - line_num = self.code.co_firstlineno - byte_num = 0 - for byte_incr, line_incr in zip(byte_increments, line_increments): - if byte_incr: - if line_num != last_line_num: - yield (byte_num, line_num) - last_line_num = line_num - byte_num += byte_incr - line_num += line_incr - if line_num != last_line_num: - yield (byte_num, line_num) - - def _find_statements(self): - """Find the statements in `self.code`. - - Produce a sequence of line numbers that start statements. Recurses - into all code objects reachable from `self.code`. - - """ - for bp in self.child_parsers(): - # Get all of the lineno information from this code. - for _, l in bp._bytes_lines(): - yield l - - SKIP_DUMP_FIELDS = ["ctx"] def _is_simple_value(value): |