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# $Id: web.krb fe1a2365d4bf 2008-12-27 mtnyogi $
# coding=utf-8
#
# Copyright © 2008 Bruce Frederiksen
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# process($starting_tables, $template_name)
# taking (db_connection, db_cursor, starting_keys)
#
# This is the top-level goal called by the wsgi application.
# Input goal arguments:
# $starting_tables - a tuple of table_names that keys will be
# provided for when the plan is called (e.g.,
# ('movie',)).
# $template_name - the filename of the template file to use
# (e.g., 'movie1.html').
# plan arguments:
# db_connection - the database connection object (to commit or
# rollback).
# db_cursor - an open cursor to the database.
# starting_keys - a dict mapping the table_names given in
# $starting_tables to their key values (e.g.,
# {'movie': 4}).
# plan return:
# The plan returns the 3-tuple that can be directly returned from the
# wsgi function.
process_retrieval
use process($starting_tables, $template_name)
taking (db_connection, db_cursor, starting_keys)
when
!format_retrieval($starting_tables, $template_name, $needed_data) \
step -1
return $$(db_connection, data)
!database.get_data($starting_tables, $needed_data)
data = $$(db_cursor, starting_keys)
#
# format_retrieval($starting_tables, $template_name, $needed_data)
# taking (data)
#
# This creates a plan to render the indicated template.
#
# Input goal arguments:
# $starting_tables - a tuple of table_names that keys will be
# provided for (e.g., ('movie',)).
# $template_name - the filename of the template file to use
# (e.g., 'movie1.html').
# Output goal arguments:
# $needed_data - a descriptor of the data that will be needed
# by the plan. This is ready for input into
# the sqlgen/database.get_data goal.
# plan arguments:
# db_connection - the database connection object (to commit or
# rollback).
# data - the dict returned by the
# sqlgen/database.get_data plan containing the
# values of the $needed_data.
# plan return:
# The plan returns the 3-tuple that can be directly returned from the
# wsgi function.
format_retrieval
use format_retrieval($starting_tables, $template_name, $needed_data)
taking (db_connection, data)
when
$template = get_template($template_name)
$elements = structure($template)
!render_elements($elements, $needed_data) as $render_fn
with
db_connection.commit()
return '200 OK', [('Content-Type', 'text/html')], \
($template.render($render_fn, data),)
#
# render_elements($elements, $needed_data) taking (template, data)
#
# This creates a plan to render the elements within an HTMLTemplate.
# Input goal arguments:
# $elements - tuple of element names, which are each
# two-tuples of the form: (element_type, name).
# Output goal arguments:
# $needed_data - a descriptor of the data that will be needed
# by the plan. This is ready for input into
# the sqlgen/database.get_data goal.
# plan arguments:
# template - the HTMLTemplate object.
# data - the dict returned by the
# sqlgen/database.get_data plan containing the
# values of the $needed_data.
# plan return:
# The plan returns the rendered html as a string.
render_elements
use render_elements($elements, $needed_data)
taking (template, data)
when
python needed_data = []
python render_fns = []
forall
$element in $elements
require
render_element1($element, $needed_data1) as $render_fn
python
needed_data1 = $needed_data1
if needed_data1 and needed_data1 not in needed_data:
needed_data.append(needed_data1)
render_fns.append($render_fn)
$needed_data = tuple(needed_data)
$render_fns = tuple(render_fns)
with
for render_fn in $render_fns: render_fn(template, data)
#
# render_element1($element, $needed_data1) taking (template, data)
#
# This creates a plan to render a single element within an HTMLTemplate.
# Input goal arguments:
# $element - a single template element as a two-tuple of
# the form: (element_type, name).
# Output goal arguments:
# $needed_data1 - an individual descriptor item of the data
# that will be needed by the plan, or None if
# no data is needed. This may describe an
# individual (unique) data item or a multi-row
# set of items. This is ready for use in the
# top-level descriptor to the
# sqlgen/database.get_data goal.
# plan arguments:
# template - the HTMLTemplate object.
# data - the dict returned by the
# sqlgen/database.get_data plan containing the
# value(s) of the $needed_data1.
# plan return:
# None - the plan modifies the HTMLTemplate object in
# place and does not return anything.
render_element1_del
use render_element1((del, $_), None)
taking (template, data)
with
pass
render_element1_sep
use render_element1((sep, $_), None)
taking (template, data)
with
pass
render_element1_con
use render_element1((con, $name), $name)
taking (template, data)
when
check $name.find('.') == -1
special.claim_goal()
with
getattr(template, $name).content = str(data[$name])
render_element1_con_dot
use render_element1((con, $name), $real_name)
taking (template, data)
when
($real_name, $index) = $name.split('.')
check $index.isdigit()
special.claim_goal()
with
getattr(template, $name).content = str(data[$real_name])
render_element1_rep
use render_element1((rep, $name, *$children), ($name, (), *$child_data))
taking (template, data)
when
!render_elements($children, $child_data) as $detail_fun
with
getattr(template, $name).repeat($detail_fun, data[$name])
bc_extras
import sys
import StringIO
import HTMLTemplate
def renderFun(template, render_fn, data):
render_fn(template, data)
def get_template(template_name):
f = open(template_name)
try:
return HTMLTemplate.Template(renderFun, f.read())
finally:
f.close()
# Kludge! HTMLTemplate needs methods to query the structure...
def structure(template):
try:
# This was stdout in earlier releases of HTMLTemplate!
stderr_save = sys.stderr
sys.stderr = StringIO.StringIO()
template.structure()
lines = sys.stderr.getvalue().split('\n')
finally:
sys.stderr.close()
sys.stderr = stderr_save
return get_info(lines, '\t')[1]
def get_info(lines, prefix, start = 0):
'''
Returns next_index, structure.
'''
ans = []
while start < len(lines):
line = lines[start]
if line and not line.startswith('---') and line != 'tem:':
if not line.startswith(prefix): break
if len(line) > len(prefix) and line[len(prefix)] == '\t':
start, children = get_info(lines, prefix + '\t', start)
ans[-1] = tuple(ans[-1]) + children
continue
else:
ans.append(tuple(line.strip().split(':')))
start += 1
#print "get_info -> %d, %s" % (start, tuple(ans))
return start, tuple(ans)
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