559 lines
25 KiB
Python
559 lines
25 KiB
Python
# ------------------------------------------------------------------------------
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# Appy is a framework for building applications in the Python language.
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# Copyright (C) 2007 Gaetan Delannay
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,USA.
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# ------------------------------------------------------------------------------
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import re
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from xml.sax.saxutils import quoteattr
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from appy.pod import PodError, XML_SPECIAL_CHARS
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from appy.pod.elements import *
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from appy.pod.actions import IfAction, ElseAction, ForAction, VariableAction, \
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NullAction
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from appy.shared import xmlPrologue
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# ------------------------------------------------------------------------------
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class ParsingError(Exception): pass
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# ParsingError-related constants -----------------------------------------------
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ELEMENT = 'identifies the part of the document that will be impacted ' \
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'by the command. It must be one of %s.' % str(PodElement.POD_ELEMS)
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FOR_EXPRESSION = 'must be of the form: {name} in {expression}. {name} must be '\
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'a Python variable name. It is the name of the iteration ' \
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'variable. {expression} is a Python expression that, when ' \
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'evaluated, produces a Python sequence (tuple, string, list, '\
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'etc).'
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POD_STATEMENT = 'A Pod statement has the ' \
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'form: do {element} [{command} {expression}]. {element} ' + \
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ELEMENT + ' Optional {command} can be "if" ' \
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'(conditional inclusion of the element) or "for" (multiple ' \
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'inclusion of the element). For an "if" command, {expression} '\
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'is any Python expression. For a "for" command, {expression} '+\
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FOR_EXPRESSION
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FROM_CLAUSE = 'A "from" clause has the form: from {expression}, where ' \
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'{expression} is a Python expression that, when evaluated, ' \
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'produces a valid chunk of odt content that will be inserted ' \
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'instead of the element that is the target of the note.'
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BAD_STATEMENT_GROUP = 'Syntax error while parsing a note whose content is ' \
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'"%s". In a note, you may specify at most 2 lines: a ' \
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'pod statement and a "from" clause. ' + POD_STATEMENT + \
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' ' + FROM_CLAUSE
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BAD_STATEMENT = 'Syntax error for statement "%s". ' + POD_STATEMENT
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BAD_ELEMENT = 'Bad element "%s". An element ' + ELEMENT
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BAD_MINUS = "The '-' operator can't be used with element '%s'. It can only be "\
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"specified for elements among %s."
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ELEMENT_NOT_FOUND = 'Action specified element "%s" but available elements ' \
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'in this part of the document are %s.'
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BAD_FROM_CLAUSE = 'Syntax error in "from" clause "%s". ' + FROM_CLAUSE
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DUPLICATE_NAMED_IF = 'An "if" statement with the same name already exists.'
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ELSE_WITHOUT_IF = 'No previous "if" statement could be found for this "else" ' \
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'statement.'
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ELSE_WITHOUT_NAMED_IF = 'I could not find an "if" statement named "%s".'
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BAD_FOR_EXPRESSION = 'Bad "for" expression "%s". A "for" expression ' + \
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FOR_EXPRESSION
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BAD_VAR_EXPRESSION = 'Bad variable definition "%s". A variable definition ' \
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'must have the form {name} = {expression}. {name} must be a Python-' \
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'compliant variable name. {expression} is a Python expression. When ' \
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'encountering such a statement, pod will define, in the specified part ' \
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'of the document, a variable {name} whose value will be the evaluated ' \
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'{expression}.'
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EVAL_EXPR_ERROR = 'Error while evaluating expression "%s". %s'
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NULL_ACTION_ERROR = 'There was a problem with this action. Possible causes: ' \
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'(1) you specified no action (ie "do text") while not ' \
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'specifying any from clause; (2) you specified the from ' \
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'clause on the same line as the action, which is not ' \
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'allowed (ie "do text from ...").'
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# ------------------------------------------------------------------------------
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class BufferIterator:
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def __init__(self, buffer):
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self.buffer = buffer
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self.remainingSubBufferIndexes = self.buffer.subBuffers.keys()
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self.remainingElemIndexes = self.buffer.elements.keys()
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self.remainingSubBufferIndexes.sort()
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self.remainingElemIndexes.sort()
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def hasNext(self):
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return self.remainingSubBufferIndexes or self.remainingElemIndexes
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def next(self):
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nextSubBufferIndex = None
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if self.remainingSubBufferIndexes:
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nextSubBufferIndex = self.remainingSubBufferIndexes[0]
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nextExprIndex = None
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if self.remainingElemIndexes:
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nextExprIndex = self.remainingElemIndexes[0]
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# Compute min between nextSubBufferIndex and nextExprIndex
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if (nextSubBufferIndex != None) and (nextExprIndex != None):
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res = min(nextSubBufferIndex, nextExprIndex)
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elif (nextSubBufferIndex == None) and (nextExprIndex != None):
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res = nextExprIndex
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elif (nextSubBufferIndex != None) and (nextExprIndex == None):
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res = nextSubBufferIndex
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# Update "remaining" lists
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if res == nextSubBufferIndex:
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self.remainingSubBufferIndexes = self.remainingSubBufferIndexes[1:]
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resDict = self.buffer.subBuffers
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elif res == nextExprIndex:
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self.remainingElemIndexes = self.remainingElemIndexes[1:]
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resDict = self.buffer.elements
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return res, resDict[res]
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# ------------------------------------------------------------------------------
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class Buffer:
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'''Abstract class representing any buffer used during rendering.'''
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elementRex = re.compile('([\w-]+:[\w-]+)\s*(.*?)>', re.S)
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def __init__(self, env, parent):
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self.parent = parent
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self.subBuffers = {} # ~{i_bufferIndex: Buffer}~
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self.env = env
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def addSubBuffer(self, subBuffer=None):
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if not subBuffer:
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subBuffer = MemoryBuffer(self.env, self)
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self.subBuffers[self.getLength()] = subBuffer
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subBuffer.parent = self
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return subBuffer
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def removeLastSubBuffer(self):
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subBufferIndexes = self.subBuffers.keys()
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subBufferIndexes.sort()
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lastIndex = subBufferIndexes.pop()
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del self.subBuffers[lastIndex]
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def write(self, something): pass # To be overridden
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def getLength(self): pass # To be overridden
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def dumpStartElement(self, elem, attrs={}):
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self.write('<%s' % elem)
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for name, value in attrs.items():
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self.write(' %s=%s' % (name, quoteattr(value)))
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self.write('>')
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def dumpEndElement(self, elem):
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self.write('</%s>' % elem)
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def dumpElement(self, elem, content=None, attrs={}):
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'''For dumping a whole element at once.'''
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self.dumpStartElement(elem, attrs)
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if content:
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self.dumpContent(content)
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self.dumpEndElement(elem)
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def dumpContent(self, content):
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'''Dumps string p_content into the buffer.'''
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for c in content:
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if XML_SPECIAL_CHARS.has_key(c):
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self.write(XML_SPECIAL_CHARS[c])
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else:
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self.write(c)
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# ------------------------------------------------------------------------------
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class FileBuffer(Buffer):
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def __init__(self, env, result):
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Buffer.__init__(self, env, None)
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self.result = result
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self.content = file(result, 'w')
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self.content.write(xmlPrologue)
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# getLength is used to manage insertions into sub-buffers. But in the case
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# of a FileBuffer, we will only have 1 sub-buffer at a time, and we don't
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# care about where it will be inserted into the FileBuffer.
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def getLength(self): return 0
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def write(self, something):
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self.content.write(something.encode('utf-8'))
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def addExpression(self, expression):
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try:
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self.dumpContent(Expression(expression).evaluate(self.env.context))
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except Exception, e:
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PodError.dump(self, EVAL_EXPR_ERROR % (expression, e), dumpTb=False)
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def pushSubBuffer(self, subBuffer): pass
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# ------------------------------------------------------------------------------
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class MemoryBuffer(Buffer):
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actionRex = re.compile('(?:(\w+)\s*\:\s*)?do\s+(\w+)(-)?' \
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'(?:\s+(for|if|else|with)\s*(.*))?')
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forRex = re.compile('\s*([\w\-_]+)\s+in\s+(.*)')
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varRex = re.compile('\s*([\w\-_]+)\s*=\s*(.*)')
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def __init__(self, env, parent):
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Buffer.__init__(self, env, parent)
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self.content = u''
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self.elements = {}
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self.action = None
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def addSubBuffer(self, subBuffer=None):
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sb = Buffer.addSubBuffer(self, subBuffer)
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self.content += ' ' # To avoid having several subbuffers referenced at
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# the same place within this buffer.
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return sb
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def getFileBuffer(self):
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if isinstance(self.parent, FileBuffer):
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res = self.parent
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else:
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res = self.parent.getFileBuffer()
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return res
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def getLength(self): return len(self.content)
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def write(self, thing): self.content += thing
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def getIndex(self, podElemName):
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res = -1
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for index, podElem in self.elements.iteritems():
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if podElem.__class__.__name__.lower() == podElemName:
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if index > res:
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res = index
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return res
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def getMainElement(self):
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res = None
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if self.elements.has_key(0):
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res = self.elements[0]
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return res
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def isMainElement(self, elem):
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res = False
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mainElem = self.getMainElement()
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if mainElem and (elem == mainElem.OD.elem):
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res = True
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# Check if this element is not found again within the buffer
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for index, podElem in self.elements.iteritems():
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if podElem.OD:
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if (podElem.OD.elem == mainElem.OD.elem) and (index != 0):
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res = False
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break
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return res
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def unreferenceElement(self, elem):
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# Find last occurrence of this element
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elemIndex = -1
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for index, podElem in self.elements.iteritems():
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if podElem.OD:
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if (podElem.OD.elem == elem) and (index > elemIndex):
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elemIndex = index
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del self.elements[elemIndex]
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def pushSubBuffer(self, subBuffer):
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'''Sets p_subBuffer at the very end of the buffer.'''
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subIndex = None
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for index, aSubBuffer in self.subBuffers.iteritems():
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if aSubBuffer == subBuffer:
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subIndex = index
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break
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if subIndex != None:
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# Indeed, it is possible that this buffer is not referenced
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# in the parent (if it is a temp buffer generated from a cut)
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del self.subBuffers[subIndex]
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self.subBuffers[self.getLength()] = subBuffer
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self.content += u' '
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def transferAllContent(self):
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'''Transfer all content to parent.'''
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if isinstance(self.parent, FileBuffer):
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# First unreference all elements
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for index in self.getElementIndexes(expressions=False):
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del self.elements[index]
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self.evaluate()
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else:
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# Transfer content in itself
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oldParentLength = self.parent.getLength()
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self.parent.write(self.content)
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# Transfer elements
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for index, podElem in self.elements.iteritems():
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self.parent.elements[oldParentLength + index] = podElem
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# Transfer subBuffers
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for index, buf in self.subBuffers.iteritems():
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self.parent.subBuffers[oldParentLength + index] = buf
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# Empty the buffer
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MemoryBuffer.__init__(self, self.env, self.parent)
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# Change buffer position wrt parent
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self.parent.pushSubBuffer(self)
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def addElement(self, elem):
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newElem = PodElement.create(elem)
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self.elements[self.getLength()] = newElem
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if isinstance(newElem, Cell) or isinstance(newElem, Table):
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newElem.tableInfo = self.env.getTable()
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if isinstance(newElem, Cell):
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# Remember where this cell is in the table
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newElem.colIndex = newElem.tableInfo.curColIndex
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def addExpression(self, expression):
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# Create the POD expression
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expr = Expression(expression)
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expr.expr = expression
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self.elements[self.getLength()] = expr
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self.content += u' '# To be sure that an expr and an elem can't be found
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# at the same index in the buffer.
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def createAction(self, statementGroup):
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'''Tries to create an action based on p_statementGroup. If the statement
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is not correct, r_ is -1. Else, r_ is the index of the element within
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the buffer that is the object of the action.'''
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res = -1
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try:
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# Check the whole statement group
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if not statementGroup or (len(statementGroup) > 2):
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raise ParsingError(BAD_STATEMENT_GROUP % str(statementGroup))
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# Check the statement
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statement = statementGroup[0]
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aRes = self.actionRex.match(statement)
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if not aRes:
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raise ParsingError(BAD_STATEMENT % statement)
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statementName, podElem, minus, actionType, subExpr = aRes.groups()
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if not (podElem in PodElement.POD_ELEMS):
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raise ParsingError(BAD_ELEMENT % podElem)
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if minus and (not podElem in PodElement.MINUS_ELEMS):
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raise ParsingError(
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BAD_MINUS % (podElem, PodElement.MINUS_ELEMS))
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indexPodElem = self.getIndex(podElem)
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if indexPodElem == -1:
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raise ParsingError(
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ELEMENT_NOT_FOUND % (podElem, str([
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e.__class__.__name__.lower() \
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for e in self.elements.values()])))
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podElem = self.elements[indexPodElem]
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# Check the 'from' clause
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fromClause = None
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source = 'buffer'
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if len(statementGroup) > 1:
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fromClause = statementGroup[1]
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source = 'from'
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if not fromClause.startswith('from '):
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raise ParsingError(BAD_FROM_CLAUSE % fromClause)
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fromClause = fromClause[5:]
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# Create the action
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if actionType == 'if':
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self.action = IfAction(statementName, self, subExpr, podElem,
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minus, source, fromClause)
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self.env.ifActions.append(self.action)
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if self.action.name:
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# We must register this action as a named action
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if self.env.namedIfActions.has_key(self.action.name):
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raise ParsingError(DUPLICATE_NAMED_IF)
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self.env.namedIfActions[self.action.name] = self.action
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elif actionType == 'else':
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if not self.env.ifActions:
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raise ParsingError(ELSE_WITHOUT_IF)
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# Does the "else" action reference a named "if" action?
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ifReference = subExpr.strip()
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if ifReference:
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if not self.env.namedIfActions.has_key(ifReference):
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raise ParsingError(ELSE_WITHOUT_NAMED_IF % ifReference)
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linkedIfAction = self.env.namedIfActions[ifReference]
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# This "else" action "consumes" the "if" action: this way,
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# it is not possible to define two "else" actions related to
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# the same "if".
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del self.env.namedIfActions[ifReference]
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self.env.ifActions.remove(linkedIfAction)
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else:
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linkedIfAction = self.env.ifActions.pop()
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self.action = ElseAction(statementName, self, None, podElem,
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minus, source, fromClause,
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linkedIfAction)
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elif actionType == 'for':
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forRes = MemoryBuffer.forRex.match(subExpr.strip())
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if not forRes:
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raise ParsingError(BAD_FOR_EXPRESSION % subExpr)
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iter, subExpr = forRes.groups()
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self.action = ForAction(statementName, self, subExpr, podElem,
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minus, iter, source, fromClause)
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elif actionType == 'with':
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varRes = MemoryBuffer.varRex.match(subExpr.strip())
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if not varRes:
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raise ParsingError(BAD_VAR_EXPRESSION % subExpr)
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varName, subExpr = varRes.groups()
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self.action = VariableAction(statementName, self, subExpr,
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podElem, minus, varName, source, fromClause)
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else: # null action
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if not fromClause:
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raise ParsingError(NULL_ACTION_ERROR)
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self.action = NullAction(statementName, self, None, podElem,
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None, source, fromClause)
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res = indexPodElem
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except ParsingError, ppe:
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PodError.dump(self, ppe, removeFirstLine=True)
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return res
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def cut(self, index, keepFirstPart):
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'''Cuts this buffer into 2 parts. Depending on p_keepFirstPart, the 1st
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(from 0 to index-1) or the second (from index to the end) part of the
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buffer is returned as a MemoryBuffer instance without parent; the other
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part is self.'''
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res = MemoryBuffer(self.env, None)
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# Manage buffer meta-info (elements, expressions, subbuffers)
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iter = BufferIterator(self)
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subBuffersToDelete = []
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elementsToDelete = []
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mustShift = False
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while iter.hasNext():
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itemIndex, item = iter.next()
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if keepFirstPart:
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if itemIndex >= index:
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newIndex = itemIndex-index
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if isinstance(item, MemoryBuffer):
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res.subBuffers[newIndex] = item
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subBuffersToDelete.append(itemIndex)
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else:
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res.elements[newIndex] = item
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elementsToDelete.append(itemIndex)
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else:
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if itemIndex < index:
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if isinstance(item, MemoryBuffer):
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res.subBuffers[itemIndex] = item
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subBuffersToDelete.append(itemIndex)
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else:
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res.elements[itemIndex] = item
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elementsToDelete.append(itemIndex)
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else:
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mustShift = True
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if elementsToDelete:
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for elemIndex in elementsToDelete:
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del self.elements[elemIndex]
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if subBuffersToDelete:
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for subIndex in subBuffersToDelete:
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del self.subBuffers[subIndex]
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if mustShift:
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elements = {}
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for elemIndex, elem in self.elements.iteritems():
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elements[elemIndex-index] = elem
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self.elements = elements
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subBuffers = {}
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for subIndex, buf in self.subBuffers.iteritems():
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subBuffers[subIndex-index] = buf
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self.subBuffers = subBuffers
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# Manage content
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if keepFirstPart:
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res.write(self.content[index:])
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self.content = self.content[:index]
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else:
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res.write(self.content[:index])
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self.content = self.content[index:]
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return res
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def getElementIndexes(self, expressions=True):
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res = []
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for index, elem in self.elements.iteritems():
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condition = isinstance(elem, Expression)
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if not expressions:
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condition = not condition
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if condition:
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res.append(index)
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return res
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def transferActionIndependentContent(self, actionElemIndex):
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# Manage content to transfer to parent buffer
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if actionElemIndex != 0:
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actionIndependentBuffer = self.cut(actionElemIndex,
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keepFirstPart=False)
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actionIndependentBuffer.parent = self.parent
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actionIndependentBuffer.transferAllContent()
|
|
self.parent.pushSubBuffer(self)
|
|
# Manage content to transfer to a child buffer
|
|
actionElemIndex = self.getIndex(
|
|
self.action.elem.__class__.__name__.lower())
|
|
# We recompute actionElemIndex because after cut it may have changed
|
|
elemIndexes = self.getElementIndexes(expressions=False)
|
|
elemIndexes.sort()
|
|
if elemIndexes.index(actionElemIndex) != (len(elemIndexes)-1):
|
|
# I must create a sub-buffer with the impactable elements after
|
|
# the action-related element
|
|
childBuffer = self.cut(elemIndexes[elemIndexes.index(
|
|
actionElemIndex)+1], keepFirstPart=True)
|
|
self.addSubBuffer(childBuffer)
|
|
res = childBuffer
|
|
else:
|
|
res = self
|
|
return res
|
|
|
|
def getStartIndex(self, removeMainElems):
|
|
'''When I must dump the buffer, sometimes (if p_removeMainElems is
|
|
True), I must dump only a subset of it. This method returns the start
|
|
index of the buffer part I must dump.'''
|
|
if removeMainElems:
|
|
# Find the start position of the deepest element to remove
|
|
deepestElem = self.action.elem.DEEPEST_TO_REMOVE
|
|
pos = self.content.find('<%s' % deepestElem.elem)
|
|
pos = pos + len(deepestElem.elem)
|
|
# Now we must find the position of the end of this start tag,
|
|
# skipping potential attributes.
|
|
inAttrValue = False # Are we parsing an attribute value ?
|
|
endTagFound = False # Have we found the end of this tag ?
|
|
while not endTagFound:
|
|
pos += 1
|
|
nextChar = self.content[pos]
|
|
if (nextChar == '>') and not inAttrValue:
|
|
# Yes we have it
|
|
endTagFound = True
|
|
elif nextChar == '"':
|
|
inAttrValue = not inAttrValue
|
|
res = pos + 1
|
|
else:
|
|
res = 0
|
|
return res
|
|
|
|
def getStopIndex(self, removeMainElems):
|
|
'''This method returns the stop index of the buffer part I must dump.'''
|
|
if removeMainElems:
|
|
ns = self.env.namespaces
|
|
deepestElem = self.action.elem.DEEPEST_TO_REMOVE
|
|
pos = self.content.rfind('</%s>' % deepestElem.getFullName(ns))
|
|
res = pos
|
|
else:
|
|
res = self.getLength()
|
|
return res
|
|
|
|
reTagContent = re.compile('<(?P<p>[\w-]+):(?P<f>[\w-]+)(.*?)>.*</(?P=p):' \
|
|
'(?P=f)>', re.S)
|
|
def evaluate(self, subElements=True, removeMainElems=False):
|
|
result = self.getFileBuffer()
|
|
if not subElements:
|
|
# Dump the root tag in this buffer, but not its content.
|
|
res = self.reTagContent.match(self.content.strip())
|
|
if not res: result.write(self.content)
|
|
else:
|
|
g = res.group
|
|
result.write('<%s:%s%s></%s:%s>' % (g(1),g(2),g(3),g(1),g(2)))
|
|
else:
|
|
iter = BufferIterator(self)
|
|
currentIndex = self.getStartIndex(removeMainElems)
|
|
while iter.hasNext():
|
|
index, evalEntry = iter.next()
|
|
result.write(self.content[currentIndex:index])
|
|
currentIndex = index + 1
|
|
if isinstance(evalEntry, Expression):
|
|
try:
|
|
result.dumpContent(evalEntry.evaluate(self.env.context))
|
|
except Exception, e:
|
|
PodError.dump(result, EVAL_EXPR_ERROR % (
|
|
evalEntry.expr, e), dumpTb=False)
|
|
else: # It is a subBuffer
|
|
if evalEntry.action:
|
|
evalEntry.action.execute()
|
|
else:
|
|
result.write(evalEntry.content)
|
|
stopIndex = self.getStopIndex(removeMainElems)
|
|
if currentIndex < (stopIndex-1):
|
|
result.write(self.content[currentIndex:stopIndex])
|
|
# ------------------------------------------------------------------------------
|