def get_page_or_404(name):
"""Return page content as a Django template or raise 404 error.
Given a page name, try get the absolute file path. If ValueError exception or in case
file path doesn't exist raise a 404 error. If exists open each file and instantiates a new Django template object
with its contents. Loop through the page's raw nodelist and checks for BlockNode with the name context. If BlockNode
is found, it defines a metavariable for us that contains that content.
:param name: the page name
:raise ValueError: raises an exception
:return: render as a template the page content inside page folder
"""
try:
file_path = safe_join(settings.SITE_PAGES_DIRECTORY, name) # absolute file path
except ValueError: # exceptional outcome
raise Http404('Page Not Found')
else: # not exceptional outcome
if not os.path.exists(file_path):
raise Http404('Page Not found')
with open(file_path, 'r') as f:
page = Template(f.read()) # instatiates a new <class 'django.template.base.Template'>
meta = None
for i, node in enumerate(list(page.nodelist)):
if isinstance(node, BlockNode) and node.name == 'context':
meta = page.nodelist.pop(i)
break
page._meta = meta
return page
def get_page_or_404(name):
"""
Return page content as a Django template or raise 404 error.
"""
try:
file_path = safe_join(settings.SITE_PAGES_DIRECTORY, name)
except ValueError:
raise Http404('Page Not found')
else:
if not os.path.exists(file_path):
raise Http404('Page Not Found')
with open(file_path, 'r') as f:
page = Template(f.read())
meta = None
# loops through the page’s raw nodelist,
# and check for a BlockNode with the name context.
# BlockNode is a class definition for creating {% block %} in Django templates.
# If the context BlockNode is found,
# we defines a meta-variable for us that contains that content.
for i, node in enumerate(list(page.nodelist)):
if isinstance(node, BlockNode) and node.name == 'context':
meta = page.nodelist.pop(i)
break
page._meta = meta
return page
def get_page_or_404(name):
"""Return page content as a Django template or raise 404 error."""
try:
# Uses safe_join to join the page’s file path with the template’s filename and returns a normalized,
# absolute version of the final path.
file_path = safe_join(settings.SITE_PAGES_DIRECTORY, name)
except ValueError:
raise Http404('Page Not Found')
else:
if not os.path.exists(file_path):
raise Http404('Page Not Found')
with open(file_path, 'r') as f:
# Opens up each file and instantiates a new Django template object with its contents.
page = Template(f.read())
meta = None
# 此代码循环遍历页面的原始节点列表，并检查名称为context的BlockNode。
# BlockNode是用于在Django模板中创建{％block％}元素的类定义。
# 如果找到上下文BlockNode，它会为我们定义包含该内容的元变量。
for i, node in enumerate(list(page.nodelist)):
if isinstance(node, BlockNode) and node.name == 'context':
meta = page.nodelist.pop(i)
break
page._meta = meta
return page
def get_page_or_404(name):
try:
file_path = safe_join(settings.SITE_PAGES_DIRECTORY,name)
print(file_path)
except ValueError:
raise Http404('Page Not Found')
else:
if not os.path.exists(file_path):
raise Http404('Page not Found')
with open(file_path, 'r') as f:
page = Template(f.read())
meta = None
for i,node in enumerate(list(page.nodelist)): # crea una tupla (1,e1) , (2,e2)
if isinstance(node,BlockNode) and node.name =='context':
meta = page.nodelist.pop(i)
break
print(type(page.nodelist))
page._meta = meta # Add la propiedad _meta que es un Node
return page
def get_page_or_404(name):
"""Return page content as a Django template or raise 404 error."""
# print('page requested:', name)
try:
# safe join returns normalized, absolute file path
file_path = safe_join(settings.SITE_PAGES_DIRECTORY, name)
except ValueError:
# print('ValueError raised')
raise Http404('Page Not Found')
else:
if not os.path.exists(file_path):
print("{} doesn't exist".format(file_path))
raise Http404('Page Not Found')
# instantiate a new template with new file
with open(file_path, 'r') as f:
page = Template(f.read())
# find all the block template tags
meta = None
for i, node in enumerate(list(page.nodelist)):
if isinstance(node, BlockNode) and node.name == 'context':
meta = page.nodelist.pop(i)
break
page._meta = meta
return page
def get_page_or_404(name):
""" Return page content as a Django template or raise 404 error """
try:
file_path = safe_join(settings.SITE_PAGES_DIRECTORY, name)
except ValueError:
raise Http404('Page not Found')
else:
if not os.path.exists(file_path):
raise Http404('Page not Found')
with open(file_path, 'r') as f:
page = Template(f.read())
meta = None
for i, node in enumerate(list(page.nodelist)):
if isinstance(node, BlockNode) and node.name == 'context':
meta = page.nodelist.pop(i)
break
page._meta = meta
return page
def get_page_or_404(name):
try:
file_path = safe_join(settings.SITE_PAGES_DIRECTORY, name)
except ValueError:
raise Http404('Página não encontrada')
else:
if not os.path.exists(file_path):
raise Http404('Página não encontrada')
with open(file_path, 'r') as arquivo:
page = Template(arquivo.read())
meta = None
for i, node in enumerate(list(page.nodelist)):
if isinstance(node, BlockNode) and node.name == 'context':
meta = page.nodelist.pop(i)
break
page._meta = meta
return page
def get_page_or_404(name):
"""Return page content as a Django template or raise 404 error"""
try:
file_path = safe_join(settings.SITE_PAGES_DIRECTORY, name)
except ValueError:
raise Http404('Page Not Found')
else:
if not os.path.exists(file_path):
raise Http404('Page Not Found')
with open(file_path, 'r') as f:
page = Template(f.read())
meta = None
for i, node in enumerate(list(page.nodelist)):
if isinstance(node, BlockNode) and node.name == 'context':
meta = page.nodelist.pop(i)
break
page._meta = meta
return page
def get_page_or_404(name):
# Retorna o conteudo da pagina ou gera o erro 404
try:
file_path = safe_join(settings.SITE_PAGES_DIRECTORY, name)
except ValueError:
raise Http404('Pagina nao encontrada 1')
else:
if not os.path.exists(file_path):
raise Http404('Pagina nao encontrada 2')
# open (filename, mode) r=read, w=witring, a=append,
with open(file_path, 'r') as f:
page = Template(f.read())
meta = None
for i, node in enumerate(list(page.nodelist)):
if isinstance(node, BlockNode) and node.name == 'context':
meta = page.nodelist.pop(i)
break
page._meta = meta
return page
def get_page_or_404(name):
'''Return page content as a Django template or raise 404 error.'''
try:
file_path = os.path.join(settings.SITE_PAGES_DIRECTORY, name)
except ValueError as e:
raise Http404('Page not found (Value error: ' + e.reason + '.) ' +
'Path=' + file_path)
else:
if not os.path.exists(file_path):
raise Http404('Page not found (Nonexistent path)')
with open(file_path, 'r', encoding='utf-8') as f:
page = Template(f.read())
meta = None
for i, node in enumerate(list(page.nodelist)):
if isinstance(node, BlockNode) and node.name == 'context':
meta = page.nodelist.pop(i)
break
page._meta = meta
return page
def get_page_or_404(name):
""" 使用Django模板技术返回页面地址或者抛出404错误 """
try:
file_path = safe_join(settings.SITE_PAGES_DIRECTORY, name)
except ValueError:
raise Http404('Page Not Found')
else:
if not os.path.exists(file_path):
raise Http404('Page not Found')
with open(file_path, 'r') as f:
page = Template(f.read())
#遍历页面的原始节点列表，检查名称为context的BlockNode,也就是找到名为context的{% block %}块，它会定义一个元变量供我们包含内容
meta = None
for i, node in enumerate(list(page.nodelist)):
if isinstance(node, BlockNode) and node.name == 'context':
meta = page.nodelist.pop(i)
break
page._meta = meta
return page
def get_page_or_404(name):
try:
file_path = safe_join(settings.SITE_PAGES_DIRECTORY, name)
except ValueError:
raise Http404('Page not found!')
else:
if not os.path.exists(file_path):
raise Http404('Page not found!')
with open(file_path, 'r') as f:
page = Template(f.read())
"""
将 html中的{% block context %}这种BlockNode数据先pop出来,再用render,序列化后填加到context中
本来是在python代码中 context词典中写的数据，现在可以用json形式写到html中了。
"""
meta = None
for i, node in enumerate(list(page.nodelist)):
if isinstance(node, BlockNode) and node.name == "context":
meta = page.nodelist.pop(i)
break
page._meta = meta
return page
def get_page_or_404(name):
"""Return page content as a Django template or raise 404 page"""
try:
# safe_join joins the page's file path with the templates
# filename and returns a normalized, absolute version of the final path
file_path = safe_join(settings.SITE_PAGES_DIRECTORY, name)
except ValueError:
if not os.path.exists(file_path):
raise Http404('Page Not Found')
with open(file_path, 'r') as f:
# opens up each file and instantiates a new
# Django template object with its content
page = Template(f.read())
meta = None
for i, node in enumerate(list(page.nodelist)):
if isinstance(node, BlockNode) and node.name == 'context':
meta = page.nodelist.pop(i)
break
page._meta = meta
return page
def get_page_or_404(name):
"""Return page content as a Django template or raise a 404 error"""
try:
file_path = safe_join(settings.SITE_PAGES_DIRECTORY, name)
except ValueError:
raise Http404('Page Not Found')
else:
if not os.path.exists(file_path):
raise Http404('Page Does Not Exist')
with open(file_path, 'r') as f:
page = Template(f.read())
"""
This code loops through the page's raw nodelist and checks for a BlockNode
with the name context. BlockNode is a class definition for creating {% block %}
elements in Django templates. If the context BlockNode is found, it defines a
metavariable for us that contains the context (57).
"""
meta = None
for i, node in enumerate(list(page.nodelist)):
if isinstance(node, BlockNode) and node.name == 'context':
meta = page.nodelist.pop(i)
break
page._meta = meta
return page