/usr/lib/python2.7/dist-packages/kid/codewriter.py is in python-kid 0.9.6-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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"""KidWriter
Write Python source code from XML.
"""
__revision__ = "$Rev: 496 $"
__date__ = "$Date: 2007-07-15 18:14:35 -0400 (Sun, 15 Jul 2007) $"
__author__ = "Ryan Tomayko (rtomayko@gmail.com)"
__copyright__ = "Copyright 2004-2005, Ryan Tomayko"
__license__ = "MIT <http://www.opensource.org/licenses/mit-license.php>"
import sys, re
from os.path import splitext
from traceback import extract_tb, format_exception_only
from kid import __version__, Namespace
from kid.parser import document, START, END, TEXT, XML_DECL, DOCTYPE, LOCATION
from kid.element import namespaces, Comment, ProcessingInstruction
__all__ = ['KID_XMLNS', 'KID_PREFIX', 'kidns', 'raise_template_error']
# the Kid XML namespace
KID_XMLNS = "http://purl.org/kid/ns#"
KID_PREFIX = 'py'
kidns = Namespace(KID_XMLNS)
QNAME_FOR = kidns['for']
QNAME_IF = kidns['if']
QNAME_DEF = kidns['def']
QNAME_SLOT = kidns['slot']
QNAME_CONTENT = kidns['content']
QNAME_REPLACE = kidns['replace']
QNAME_MATCH = kidns['match']
QNAME_STRIP = kidns['strip']
QNAME_ATTRIBUTES = kidns['attrs']
QNAME_EXTENDS = kidns['extends']
QNAME_LAYOUT = kidns['layout']
# deprectaed
QNAME_OMIT = kidns['omit']
QNAME_REPEAT = kidns['repeat']
# the Kid processing instruction name
KID_PI = 'python'
KID_ALT_PI = 'py'
KID_OLD_PI = 'kid'
def parse(source, encoding=None, filename=None, entity_map=None):
doc = document(source, encoding=encoding,
filename=filename, entity_map=entity_map)
return KidWriter(doc, encoding, filename).parse()
def parse_file(filename, encoding=None, entity_map=None):
"""Parse the file specified.
filename -- the name of a file.
fp -- an optional file like object to read from. If not specified,
filename is opened.
"""
source = open(filename, 'rb')
try:
return parse(source, encoding, filename, entity_map)
finally:
source.close()
def error_location(filename, encoding=None, entity_map=None, lineno=None):
if lineno:
try:
source = open(filename, 'rb')
try:
doc = document(source, encoding=encoding,
filename=filename, entity_map=entity_map, debug=True)
writer = KidWriter(doc, encoding, filename, lineno)
return writer.parse()
finally:
source.close()
except Exception:
pass
def TemplateExceptionError(error, add_message):
"""Get exception with additional error message."""
Error = error.__class__
class TemplateExceptionError(Error):
def __init__(self):
for arg in dir(error):
if not arg.startswith('_'):
setattr(self, arg, getattr(error, arg))
def __str__(self):
return str(error) + '\n' + add_message
TemplateExceptionError.__name__ = Error.__name__
TemplateExceptionError.__module__ = Error.__module__
return TemplateExceptionError()
def raise_template_error(module=None, filename=None, encoding=None):
"""Raise template error along with additional context information.
If the module containing the erroneous code has been compiled from
a Kid template, try to compile that template with additional debug
information, and display the location in the Kid template file
corresponding to the erroneous code.
"""
if module and not (filename and encoding):
if module in sys.modules:
mod = sys.modules[module]
if hasattr(mod, 'encoding'):
encoding = mod.encoding
if hasattr(mod, 'kid_file'):
filename = mod.kid_file
if not filename or filename == '<string>':
raise
if not encoding:
encoding = 'utf-8'
py_file = splitext(filename)[0] + '.py'
exc_type, exc_value = sys.exc_info()[:2]
if exc_type == SyntaxError:
tb = [(py_file, exc_value.lineno)]
else:
tb = extract_tb(sys.exc_info()[2])
tb.reverse()
for t in tb:
if py_file != t[0] or not t[1]:
continue
location = error_location(filename, encoding, lineno=t[1])
if not location:
continue
(start_line, start_col), (end_line, end_col) = location
if start_line > end_line:
continue
s = []
if not end_col and end_line > start_line:
end_line -= 1
end_col = -1
if start_line == end_line:
s.append('on line %d' % start_line)
if start_col == end_col:
s.append(', column %d' % start_col)
elif start_col:
if end_col > start_col:
s.append(' between columns %d and %d'
% (start_col, end_col))
else:
s.append(' after column %d' % start_col)
elif end_col > 0:
s.append(' before column %d' % end_col)
else:
s.append('between line %d' % start_line)
if start_col:
s.append(', column %d' % start_col)
s.append(' and line %d' % end_line)
if end_col > 0:
s.append(', column %d' % end_col)
if s:
s = ''.join(s)
try:
start_line -= 1
end_line -= 1
error_line, error_text = [], []
for line, text in enumerate(open(filename)):
if line < start_line:
continue
text = text.rstrip()
if text:
if line == start_line and start_col:
if text[:start_col].rstrip():
text = text[start_col:].lstrip()
if text:
text = '... ' + text
if line == end_line and end_col > 0:
if text[end_col:].lstrip():
if end_col > 75:
end_col = 75
text = text[:end_col].rstrip()
if text:
text += ' ...'
else:
text = text[:end_col].rstrip()
if len(text) > 79:
text = text[:75].rstrip() + ' ...'
if text:
if len(error_line) < 3:
error_line.append(line)
error_text.append(text)
else:
error_line[2] = line
error_text[2] = text
if line >= end_line:
break
if not error_line:
raise LookupError, 'error line not found'
if len(error_line) == 2:
if error_line[1] - error_line[0] > 1:
error_text.insert(1, '...')
elif len(error_line) == 3:
if error_line[2] - error_line[0] > 2:
error_text[1] = '...'
s = [s + ':'] + error_text
except Exception, e:
s = [s, '(cannot acquire source text: %s)' % str(e)]
s.insert(0, 'Error location in template file %r' % filename)
break
else:
s = ['Error in code generated from template file %r' % filename]
s = ''.join(format_exception_only(exc_type, exc_value)[:-1]) + '\n'.join(s)
if isinstance(exc_type, str):
exc_type += '\n' + s
else:
exc_value = TemplateExceptionError(exc_value, s)
exc_type = exc_value.__class__
raise exc_type, exc_value, sys.exc_info()[2]
class KidWriter(object):
def __init__(self, stream, encoding=None, filename=None, lineno=None):
self.stream = stream
self.encoding = encoding or 'utf-8'
self.filename = filename
self.depth = 0
self.lineno = lineno
self.location = None
self.locations = []
self.module_code = self.codegen()
self.class_code = self.codegen()
self.expand_code = self.codegen(level=1)
self.end_module_code = self.codegen()
self.module_defs = []
self.inst_defs = []
def codegen(self, code=None, level=0, tab='\t'):
if self.lineno:
return LocationGenerator(code, self.getloc)
else:
return CodeGenerator(code, level, tab)
def getloc(self):
return self.location
def parse(self):
self.begin()
self.proc_stream(self.module_code)
self.end()
parts = []
parts += self.module_code.code
for c in self.module_defs:
parts += c.code
parts += self.class_code.code
parts += self.expand_code.code
for c in self.inst_defs:
parts += c.code
parts += self.end_module_code.code
if self.lineno:
lineno = self.lineno - 1
if not 0 <= lineno < len(parts):
return None
pos = parts[lineno]
if not pos:
return None
pos, is_start = pos
if not 0 <= pos < len(self.locations):
return None
start_loc = self.locations[pos]
pos += is_start and 1 or -1
if 0 <= pos < len(self.locations):
end_loc = self.locations[pos]
else:
end_line = start_loc[0]
if is_start:
end_line += 1
end_loc = (end_line, 0)
if not is_start:
start_loc, end_loc = end_loc, start_loc
return start_loc, end_loc
return '\n'.join(parts)
def begin(self):
code = self.module_code
# Start with PEP 0263 encoding declaration
code.line('# -*- coding: %s -*-' % self.encoding,
'# Kid template module',
# version against which the file has been compiled
'kid_version = %r' % __version__,
# source from which the file has been compiled
'kid_file = %r' % self.filename,
# imports
'import kid',
'from kid.template_util import *',
'import kid.template_util as template_util',
'_def_names = []',
# default variables (can be overridden by template)
'encoding = "%s"' % self.encoding,
'doctype = None',
'omit_namespaces = [kid.KID_XMLNS]',
'layout_params = {}',
# module methods
'def pull(**kw): return Template(**kw).pull()',
"def generate(encoding=encoding, fragment=False,"
" output=None, format=None, **kw):"
" return Template(**kw).generate(encoding=encoding,"
" fragment=fragment, output=output, format=format)",
"def serialize(encoding=encoding, fragment=False,"
" output=None, format=None, **kw):"
" return Template(**kw).serialize(encoding=encoding,"
" fragment=fragment, output=output, format=format)",
"def write(file, encoding=encoding, fragment=False,"
" output=None, format=None, **kw):"
" return Template(**kw).write(file, encoding=encoding,"
" fragment=fragment, output=output, format=format)",
'def initialize(template): pass',
'BaseTemplate = kid.BaseTemplate')
# expand code
code = self.expand_code
code.start_block('def initialize(self):')
code.line('rslt = initialize(self)',
'if rslt != 0: super(Template, self).initialize()')
code.end_block()
code.start_block('def _pull(self):')
# XXX hack: nasty kluge for making kwargs locals
code.line("exec template_util.get_locals(self, locals())",
'current, ancestors = None, []',
'if doctype: yield DOCTYPE, doctype')
code = self.end_module_code
code.line('')
def end(self):
self.expand_code.end_block()
def proc_stream(self, code):
for ev, item in self.stream:
if ev == START:
if item.tag == Comment:
text = item.text.strip()
if text.startswith('!'):
continue # swallow comment
if code is self.module_code:
line = self.expand_code.line
else:
line = code.line
if text.startswith('[') or text.startswith('<![') \
or text.endswith('//'):
sub = interpolate(item.text)
if isinstance(sub, list):
text = "''.join([unicode(o) for o in %r])" % sub
else:
text = repr(sub)
else:
text = repr(item.text)
line('_e = Comment(%s)' % text,
'yield START, _e; yield END, _e; del _e')
elif item.tag == ProcessingInstruction:
if ' ' in item.text.strip():
name, data = item.text.split(' ', 1)
else:
name, data = item.text, ''
if name in (KID_PI, KID_ALT_PI, KID_OLD_PI):
if data:
code.insert_block(data)
else:
c = self.depth and code or self.expand_code
c.line('_e = ProcessingInstruction(%r, %r)'
% (name, data),
'yield START, _e; yield END, _e; del _e')
del c
else:
layout = None
if code is self.module_code:
layout = item.get(QNAME_LAYOUT)
if layout is not None:
del item.attrib[QNAME_LAYOUT]
layout = str(layout)
base_classes = []
extends = item.get(QNAME_EXTENDS)
if extends is not None:
del item.attrib[QNAME_EXTENDS]
extends = str(extends)
for c in extends.split(','):
base_classes.append('BaseTemplate%d'
% (len(base_classes) + 1))
code.line('%s = template_util'
'.base_class_extends(%r, globals(), {}, %r)'
% (base_classes[-1], c.strip(), extends))
code.end_block()
base_classes.append('BaseTemplate')
code = self.class_code
code.start_block('class Template(%s):'
% ', '.join(base_classes))
code.line('_match_templates = []')
code = self.expand_code
self.def_proc(item, item.attrib, code)
if layout is not None:
old_code = code
code = self.codegen(level=1)
code.start_block('def _pull(self):')
# Note: the following hack could be avoided
# if template args were not stored in self.__dict__
code.line(
'exec template_util.get_locals(self, locals())',
'kw = dict(layout_params)',
'kw.update(dict([(name, getattr(self, name))'
' for name in _def_names]))',
'kw.update(self.__dict__)',
# Note: these names cannot be passed
# to the layout template via layout_params
'kw.pop("assume_encoding", None)',
'kw.pop("_layout_classes", None)',
't = template_util.base_class_layout('
'%r, globals(), locals())(**kw)' % layout,
't._match_templates += self._match_templates',
'bases = [b for b in t.__class__.__bases__'
' if b not in self.__class__.__bases__]',
'self.__class__.__bases__ = tuple(bases)'
' + self.__class__.__bases__',
'return t._pull()')
code.end_block()
self.inst_defs.append(code)
code = old_code
if self.location:
# code is inside the current tag:
self.location[1] = True
elif ev == END and item.tag not in (
ProcessingInstruction, Comment):
break
elif ev == TEXT:
self.text_interpolate(item, code)
elif ev == XML_DECL and item[1] is not None:
encoding = str(item[1])
if encoding != self.encoding:
self.module_code.line('encoding = %r' % encoding)
elif ev == DOCTYPE:
self.module_code.line('doctype = (%r, %r, %r)' % item)
elif ev == LOCATION:
# store all different locations in the XML file in a list
n = len(self.locations) - 1
if n < 0 or item != self.locations[n]:
self.locations.append(item)
n += 1
# store current location from this list for every code line
# along with a flag indicating this is the starting location
self.location = [n, False]
def def_proc(self, item, attrib, code):
attr_name = QNAME_DEF
decl = attrib.get(attr_name)
if decl is None:
attr_name = QNAME_SLOT
decl = attrib.get(attr_name)
if decl is not None:
del attrib[attr_name]
old_code = code
if '(' not in decl:
decl += '()'
name, args = decl.split('(', 1)
args = args.lstrip()
if not args.startswith(')'):
args = ', ' + args
class_decl = '(self'.join((name, args))
# module function code
code = self.codegen()
code.start_block('def %s(*args, **kw):' % name)
code.line('return Template().%s(*args, **kw)' % name)
code.end_block()
code.line('_def_names.append("%s")' % name)
self.module_defs.append(code)
# instance method code
code = self.codegen(level=1)
code.start_block('def __%s:' % class_decl)
code.line('exec template_util.get_locals(self, locals())',
'current, ancestors = None, []')
self.inst_defs.append(code)
self.match_proc(item, attrib, code)
code.end_block()
code.start_block('def %s(self, *args, **kw):' % name)
code.line('return ElementStream(self.__%s(*args, **kw))' % name)
code.end_block()
if attr_name == QNAME_SLOT:
old_code.line('for _e in template_util'
'.generate_content(self.%s()): yield _e' % name)
else:
self.match_proc(item, attrib, code)
def match_proc(self, item, attrib, code):
expr = attrib.get(QNAME_MATCH)
if expr is not None:
del attrib[QNAME_MATCH]
code = self.codegen(level=1)
code.start_block('def _match_func(self, item, apply):')
code.line('exec template_util.get_locals(self, locals())',
'current, ancestors = None, []')
self.for_proc(item, attrib, code)
code.end_block()
code.line('_match_templates.append('
'(lambda item: %s, _match_func))' % expr)
self.inst_defs.append(code)
else:
self.for_proc(item, attrib, code)
def for_proc(self, item, attrib, code):
expr = attrib.get(QNAME_FOR)
if expr is not None:
code.start_block('for %s:' % expr)
del attrib[QNAME_FOR]
self.if_proc(item, attrib, code)
code.end_block()
else:
self.if_proc(item, attrib, code)
def if_proc(self, item, attrib, code):
expr = attrib.get(QNAME_IF)
if expr is not None:
code.start_block('if %s:' % expr)
del attrib[QNAME_IF]
self.replace_proc(item, attrib, code)
code.end_block()
else:
self.replace_proc(item, attrib, code)
def replace_proc(self, item, attrib, code):
expr = attrib.get(QNAME_REPLACE)
if expr is not None:
del attrib[QNAME_REPLACE]
attrib[QNAME_STRIP] = ""
attrib[QNAME_CONTENT] = expr
self.strip_proc(item, attrib, code)
def strip_proc(self, item, attrib, code):
has_content = self.content_proc(attrib, code)
expr, attr = attrib.get(QNAME_STRIP), QNAME_STRIP
if expr is None:
# XXX py:omit is deprecated equivalent of py:strip
expr, attr = attrib.get(QNAME_OMIT), QNAME_OMIT
start_block, end_block = code.start_block, code.end_block
line = code.line
if expr is not None:
del attrib[attr]
if expr != '':
start_block("if not (%s):" % expr)
self.attrib_proc(item, attrib, code)
end_block()
else:
pass # element is always stripped
else:
self.attrib_proc(item, attrib, code)
if has_content:
code.start_block(
'for _e in template_util.generate_content(_cont):')
line('yield _e', 'del _e')
code.end_block()
self.stream.eat()
else:
self.depth += 1
self.proc_stream(code)
self.depth -= 1
if expr:
start_block("if not (%s):" % expr)
line('yield END, current',
'current = ancestors.pop(0)')
end_block()
elif expr != '':
line('yield END, current',
'current = ancestors.pop(0)')
def attrib_proc(self, item, attrib, code):
line = code.line
need_interpolation = False
names = namespaces(item, remove=True)
for k, v in attrib.items():
sub = interpolate(v)
if id(sub) != id(v):
attrib[k] = sub
if isinstance(sub, list):
need_interpolation = True
expr = attrib.get(QNAME_ATTRIBUTES)
if expr is not None:
del attrib[QNAME_ATTRIBUTES]
attr_text = ('template_util.make_updated_attrib('
'%r, "%s", globals(), locals(), self._get_assume_encoding())'
% (attrib, expr.replace('"', '\\\"')))
else:
if attrib:
if need_interpolation:
attr_text = ('template_util.make_attrib('
'%r, self._get_assume_encoding())' % attrib)
else:
attr_text = repr(attrib)
else:
attr_text = '{}'
line('ancestors.insert(0, current)',
'current = Element(%r, %s)' % (item.tag, attr_text))
if len(names):
code.start_block('for _p, _u in %r.items():' % names)
line('if not _u in omit_namespaces: yield START_NS, (_p,_u)')
code.end_block()
line('yield START, current')
def content_proc(self, attrib, code):
expr = attrib.get(QNAME_CONTENT)
if expr is not None:
del attrib[QNAME_CONTENT]
if expr:
code.line('_cont = %s' % expr)
else:
code.line('_cont = None')
return True
def text_interpolate(self, text, code):
line = code.line
sub = interpolate(text)
if isinstance(sub, list):
code.start_block('for _e in %r:' % sub)
code.line('for _e2 in template_util'
'.generate_content(_e): yield _e2')
code.end_block()
else:
line('yield TEXT, %r' % sub)
class SubExpression(list):
"""Collecting and representing expressions."""
def __repr__(self):
return "[%s]" % ', '.join(map(_ascii_encode, self))
# regular expression for expression substitution
_sub_expr = re.compile( # $$ | $expr | ${expr}
r"\$(\$|[a-zA-Z][a-zA-Z0-9_\.]*|\{.*?\})",
re.DOTALL) # this is for multi-line expressions
def interpolate(text):
"""Perform expression substitution on text."""
text = _sub_expr.split(text)
if len(text) == 1:
# shortcut for standard case
return text[0]
# build subexpression list,
# making it as small as possible (coalesce pieces)
parts = SubExpression()
plain_parts = [] # collect plaintext parts here
plain = True # first part is plaintext
for part in text:
if part: # skip empty text
if plain or part == '$': # plaintext
plain_parts.append(part)
else: # code expression
if part.startswith('{'):
# long form
part = part[1:-1].strip()
if part: # skip empty expressions
plain_parts = ''.join(plain_parts)
if plain_parts:
parts.append(repr(plain_parts))
plain_parts = []
parts.append(part)
# plaintext and code parts take turns
plain = not plain
plain_parts = ''.join(plain_parts)
if parts:
if plain_parts:
parts.append(repr(plain_parts))
return parts
else:
return plain_parts
class CodeGenerator(object):
"""A simple Python code generator."""
level = 0
tab = '\t'
def __init__(self, code=None, level=0, tab='\t'):
self.code = code or []
if level != self.level:
self.level = level
if tab != self.tab:
self.tab = tab
self.pad = self.tab * self.level
def line(self, *lines):
for text in lines:
self.code.append(self.pad + text)
def start_block(self, text):
self.line(text)
self.level += 1
self.pad += self.tab
def end_block(self, nblocks=1, with_pass=False):
for n in range(nblocks):
if with_pass:
self.line('pass')
self.level -= 1
self.pad = self.pad[:-len(self.tab)]
def insert_block(self, block):
lines = block.splitlines()
if len(lines) == 1:
# special case single lines
self.line(lines[0].strip())
else:
# adjust the block
for line in _adjust_python_block(lines, self.tab):
self.line(line)
def __str__(self):
return '\n'.join(self.code + [''])
class LocationGenerator(object):
"""A simple location generator for debugging."""
def __init__(self, code=None, getloc=None):
self.code = code or []
if getloc:
self.getloc = getloc
def getloc(self):
return len(self.code)
def line(self, *lines):
n = 0
for text in lines:
n += len(text.splitlines())
self.code.extend(n*[self.getloc()])
def start_block(self, text):
self.line(text)
def end_block(self, nblocks=1, with_pass=False):
if with_pass:
self.line(['pass']*len(nblocks))
def insert_block(self, block):
self.line(block)
def __str__(self):
return 'Current location: %r' % self.getloc()
# Auxiliary functions
def _ascii_encode(s):
return s. encode('ascii', 'backslashreplace')
def _adjust_python_block(lines, tab='\t'):
"""Adjust the indentation of a Python block."""
lines = [lines[0].strip()] + [line.rstrip() for line in lines[1:]]
ind = None # find least index
for line in lines[1:]:
if line != '':
s = line.lstrip()
if s[0] != '#':
i = len(line) - len(s)
if ind is None or i < ind:
ind = i
if i == 0:
break
if ind is not None or ind != 0: # remove indentation
lines[1:] = [line[:ind].lstrip() + line[ind:]
for line in lines[1:]]
if lines[0] and not lines[0][0] == '#':
# the first line contains code
try: # try to compile it
compile(lines[0], '<string>', 'exec')
# if it works, line does not start new block
except SyntaxError: # unexpected EOF while parsing?
try: # try to compile the whole block
block = '\n'.join(lines) + '\n'
compile(block, '<string>', 'exec')
# if it works, line does not start new block
except IndentationError: # expected an indented block?
# so try to add some indentation:
lines2 = lines[:1] + [tab + line for line in lines[1:]]
block = '\n'.join(lines2) + '\n'
# try again to compile the whole block:
compile(block, '<string>', 'exec')
lines = lines2 # if it works, keep the indentation
except:
pass # leave it as it is
except:
pass # leave it as it is
return lines
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