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# Copyright 2013-2020 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)
"""Enhanced YAML parsing for Spack.
- ``load()`` preserves YAML Marks on returned objects -- this allows
us to access file and line information later.
- ``Our load methods use ``OrderedDict`` class instead of YAML's
default unorderd dict.
"""
import ctypes
import collections
from ordereddict_backport import OrderedDict
from six import string_types, StringIO
import ruamel.yaml as yaml
from ruamel.yaml import RoundTripLoader, RoundTripDumper
from llnl.util.tty.color import colorize, clen, cextra
import spack.error
# Only export load and dump
__all__ = ['load', 'dump', 'SpackYAMLError']
# Make new classes so we can add custom attributes.
# Also, use OrderedDict instead of just dict.
class syaml_dict(OrderedDict):
def __repr__(self):
mappings = ('%r: %r' % (k, v) for k, v in self.items())
return '{%s}' % ', '.join(mappings)
class syaml_list(list):
__repr__ = list.__repr__
class syaml_str(str):
__repr__ = str.__repr__
class syaml_int(int):
__repr__ = int.__repr__
#: mapping from syaml type -> primitive type
syaml_types = {
syaml_str: string_types,
syaml_int: int,
syaml_dict: dict,
syaml_list: list,
}
markable_types = set(syaml_types) | set([
yaml.comments.CommentedSeq,
yaml.comments.CommentedMap])
def syaml_type(obj):
"""Get the corresponding syaml wrapper type for a primitive type.
Return:
(object): syaml-typed copy of object, or the obj if no wrapper
"""
for syaml_t, t in syaml_types.items():
if type(obj) is not bool and isinstance(obj, t):
return syaml_t(obj) if type(obj) != syaml_t else obj
return obj
def markable(obj):
"""Whether an object can be marked."""
return type(obj) in markable_types
def mark(obj, node):
"""Add start and end markers to an object."""
if hasattr(node, 'start_mark'):
obj._start_mark = node.start_mark
elif hasattr(node, '_start_mark'):
obj._start_mark = node._start_mark
if hasattr(node, 'end_mark'):
obj._end_mark = node.end_mark
elif hasattr(node, '_end_mark'):
obj._end_mark = node._end_mark
def marked(obj):
"""Whether an object has been marked by spack_yaml."""
return (hasattr(obj, '_start_mark') and obj._start_mark or
hasattr(obj, '_end_mark') and obj._end_mark)
class OrderedLineLoader(RoundTripLoader):
"""YAML loader specifically intended for reading Spack configuration
files. It preserves order and line numbers. It also has special-purpose
logic for handling dictionary keys that indicate a Spack config
override: namely any key that contains an "extra" ':' character.
Mappings read in by this loader behave like an ordered dict.
Sequences, mappings, and strings also have new attributes,
``_start_mark`` and ``_end_mark``, that preserve YAML line
information in the output data.
"""
#
# Override construct_yaml_* so that we can apply _start_mark/_end_mark to
# them. The superclass returns CommentedMap/CommentedSeq objects that we
# can add attributes to (and we depend on their behavior to preserve
# comments).
#
# The inherited sequence/dictionary constructors return empty instances
# and fill in with mappings later. We preserve this behavior.
#
def construct_yaml_str(self, node):
value = super(OrderedLineLoader, self).construct_yaml_str(node)
# There is no specific marker to indicate that we are parsing a key,
# so this assumes we are talking about a Spack config override key if
# it ends with a ':' and does not contain a '@' (which can appear
# in config values that refer to Spack specs)
if value and value.endswith(':') and '@' not in value:
value = syaml_str(value[:-1])
value.override = True
else:
value = syaml_str(value)
mark(value, node)
return value
def construct_yaml_seq(self, node):
gen = super(OrderedLineLoader, self).construct_yaml_seq(node)
data = next(gen)
if markable(data):
mark(data, node)
yield data
for x in gen:
pass
def construct_yaml_map(self, node):
gen = super(OrderedLineLoader, self).construct_yaml_map(node)
data = next(gen)
if markable(data):
mark(data, node)
yield data
for x in gen:
pass
# register above new constructors
OrderedLineLoader.add_constructor(
'tag:yaml.org,2002:map', OrderedLineLoader.construct_yaml_map)
OrderedLineLoader.add_constructor(
'tag:yaml.org,2002:seq', OrderedLineLoader.construct_yaml_seq)
OrderedLineLoader.add_constructor(
'tag:yaml.org,2002:str', OrderedLineLoader.construct_yaml_str)
class OrderedLineDumper(RoundTripDumper):
"""Dumper that preserves ordering and formats ``syaml_*`` objects.
This dumper preserves insertion ordering ``syaml_dict`` objects
when they're written out. It also has some custom formatters
for ``syaml_*`` objects so that they are formatted like their
regular Python equivalents, instead of ugly YAML pyobjects.
"""
def ignore_aliases(self, _data):
"""Make the dumper NEVER print YAML aliases."""
return True
def represent_str(self, data):
if hasattr(data, 'override') and data.override:
data = data + ':'
return super(OrderedLineDumper, self).represent_str(data)
class SafeDumper(RoundTripDumper):
def ignore_aliases(self, _data):
"""Make the dumper NEVER print YAML aliases."""
return True
# Make our special objects look like normal YAML ones.
RoundTripDumper.add_representer(syaml_dict, RoundTripDumper.represent_dict)
RoundTripDumper.add_representer(syaml_list, RoundTripDumper.represent_list)
RoundTripDumper.add_representer(syaml_int, RoundTripDumper.represent_int)
RoundTripDumper.add_representer(syaml_str, RoundTripDumper.represent_str)
OrderedLineDumper.add_representer(syaml_str, OrderedLineDumper.represent_str)
#: Max integer helps avoid passing too large a value to cyaml.
maxint = 2 ** (ctypes.sizeof(ctypes.c_int) * 8 - 1) - 1
def dump(obj, default_flow_style=False, stream=None):
return yaml.dump(obj, default_flow_style=default_flow_style, width=maxint,
Dumper=SafeDumper, stream=stream)
def file_line(mark):
"""Format a mark as <file>:<line> information."""
result = mark.name
if mark.line:
result += ':' + str(mark.line)
return result
#: Global for interactions between LineAnnotationDumper and dump_annotated().
#: This is nasty but YAML doesn't give us many ways to pass arguments --
#: yaml.dump() takes a class (not an instance) and instantiates the dumper
#: itself, so we can't just pass an instance
_annotations = []
class LineAnnotationDumper(OrderedLineDumper):
"""Dumper that generates per-line annotations.
Annotations are stored in the ``_annotations`` global. After one
dump pass, the strings in ``_annotations`` will correspond one-to-one
with the lines output by the dumper.
LineAnnotationDumper records blame information after each line is
generated. As each line is parsed, it saves file/line info for each
object printed. At the end of each line, it creates an annotation
based on the saved mark and stores it in ``_annotations``.
For an example of how to use this, see ``dump_annotated()``, which
writes to a ``StringIO`` then joins the lines from that with
annotations.
"""
saved = None
def __init__(self, *args, **kwargs):
super(LineAnnotationDumper, self).__init__(*args, **kwargs)
del _annotations[:]
self.colors = 'KgrbmcyGRBMCY'
self.filename_colors = {}
def process_scalar(self):
super(LineAnnotationDumper, self).process_scalar()
if marked(self.event.value):
self.saved = self.event.value
def represent_data(self, data):
"""Force syaml_str to be passed through with marks."""
result = super(LineAnnotationDumper, self).represent_data(data)
if isinstance(result.value, string_types):
result.value = syaml_str(data)
if markable(result.value):
mark(result.value, data)
return result
def write_stream_start(self):
super(LineAnnotationDumper, self).write_stream_start()
_annotations.append(colorize('@K{---}'))
def write_line_break(self):
super(LineAnnotationDumper, self).write_line_break()
if not self.saved:
return
# append annotations at the end of each line
if self.saved:
mark = self.saved._start_mark
color = self.filename_colors.get(mark.name)
if not color:
ncolors = len(self.colors)
color = self.colors[len(self.filename_colors) % ncolors]
self.filename_colors[mark.name] = color
fmt = '@%s{%%s}' % color
ann = fmt % mark.name
if mark.line is not None:
ann += ':@c{%s}' % (mark.line + 1)
_annotations.append(colorize(ann))
else:
_annotations.append('')
def load_config(*args, **kwargs):
"""Load but modify the loader instance so that it will add __line__
attributes to the returned object."""
kwargs['Loader'] = OrderedLineLoader
return yaml.load(*args, **kwargs)
def load(*args, **kwargs):
return yaml.load(*args, **kwargs)
def dump_config(*args, **kwargs):
blame = kwargs.pop('blame', False)
if blame:
return dump_annotated(*args, **kwargs)
else:
kwargs['Dumper'] = OrderedLineDumper
return yaml.dump(*args, **kwargs)
def dump_annotated(data, stream=None, *args, **kwargs):
kwargs['Dumper'] = LineAnnotationDumper
sio = StringIO()
yaml.dump(data, sio, *args, **kwargs)
lines = sio.getvalue().rstrip().split('\n')
getvalue = None
if stream is None:
stream = StringIO()
getvalue = stream.getvalue
# write out annotations and linees, accounting for color
width = max(clen(a) for a in _annotations)
formats = ['%%-%ds %%s\n' % (width + cextra(a)) for a in _annotations]
for f, a, l in zip(formats, _annotations, lines):
stream.write(f % (a, l))
if getvalue:
return getvalue()
def sorted_dict(dict_like):
"""Return an ordered dict with all the fields sorted recursively.
Args:
dict_like (dict): dictionary to be sorted
Returns:
dictionary sorted recursively
"""
result = syaml_dict(sorted(dict_like.items()))
for key, value in result.items():
if isinstance(value, collections.Mapping):
result[key] = sorted_dict(value)
return result
class SpackYAMLError(spack.error.SpackError):
"""Raised when there are issues with YAML parsing."""
def __init__(self, msg, yaml_error):
super(SpackYAMLError, self).__init__(msg, str(yaml_error))
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