function.py

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"""
Created on Nov 22, 2014

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@author: Dula Nad
"""
from .variable import Variable

class Function:
    """
    Represents the C++ function in the object form.
    
    Class attributes:
    _XMLTAG -- constant string with the xml tag description
    """
    _XMLTAG = 'func'

    def __init__(self, xmlnode = None):
        """
        Populates the variable from a XML node info.
        When the XML node is not defined, does nothing.
        
        xmlnode -- the XML node with the member definition
            
        Instance attributes:
        fname -- name of the function
        fargs -- the argument list 
        fret -- the return type
        fbody -- function body
        finline -- flag i the function is to be in-line
        fqual -- the qualifer of the functon
        """
        self.fname = 'unnamed'
        self.fret = 'void'
        self.fargs = []
        self.fbody = ''
        self.finline = False
        self.fqual = None
        
        if xmlnode != None: self.from_xml(xmlnode)
        
    def from_xml(self, xmlnode):
        """
        Extracts the variable attributes from the XML node.
        
        xmlnode -- the XML node with the member definition
        """
        
        if xmlnode.tag != self._XMLTAG:
            raise NameError(self.__class__.__name__ + 
                            ' expected XML tag: "' + 
                            self._XMLTAG + 
                            '"')
        
        self.fname = xmlnode.get('name',self.fname)
        self.fret = xmlnode.get('return',self.fret)
        self.finline = xmlnode.get('inline',self.finline)
        self.fqual = xmlnode.get('qualifier',self.fqual)
        
        for node in xmlnode.findall('var'):
            self.fargs.append(Variable(node))  
            
        
        
    def gen_code(self, bindent = '', indent = '  '):
        """
        Generates the full member definition C++ code and
        returns it as a string
        
        bindent -- the current indent in the document
        indent -- the usual minimum indentation
        """
        code = bindent + indent + self.fret + ' '
        code = code + self.fname + '(' 
        
        for arg in self.fargs:
            code = code + arg.vtype + ' ' + arg.vname + ',' 
       
        if len(self.fargs): code = code[:-1]
        code = code + ')' 
        if self.fqual != None:
            code = code + ' ' + self.fqual
            
        if self.finline:
            code = code + '\n{\n' + bindent + indent + self.fbody + '\n}'
            
        return code + ";"
    
    def gen_impl(self, namespace = None, bindent = '', indent = '  '):
        """
        Generates the full member definition C++ code and
        returns it as a string
        
        bindent -- the current indent in the document
        indent -- the usual minimum indentation
        """
        if self.finline: return ''
        
        code = bindent + self.fret + ' '
        if namespace != None:
            code = code + namespace + '::'
        
        code = code + self.fname + '(' 
        
        for arg in self.fargs:
            code = code + arg.vtype + ' ' + arg.vname + ',' 
       
        if len(self.fargs): code = code[:-1]
        
        code = code + ')'
        if self.fqual != None:
            code = code + ' ' + self.fqual
            
        return code + '\n{\n' + indent + self.fbody + '\n}\n'
        
    def __str__(self):
        """
        Overriden string specifier returns the C++ code snippet 
        without indentation.
        """
        return self.gen_code(indent = '')