| 1 | import sys, collections.abc |
| 2 | import xml.dom.minidom |
| 3 | |
| 4 | class node(object): |
| 5 | pass |
| 6 | |
| 7 | class text(node, str): |
| 8 | def __todom__(self, doc): |
| 9 | return doc.createTextNode(self) |
| 10 | |
| 11 | class raw(node, str): |
| 12 | def __todom__(self, doc): |
| 13 | raise Exception("Cannot convert raw code to DOM objects") |
| 14 | |
| 15 | class element(node): |
| 16 | def __init__(self, ns, name, ctx): |
| 17 | self.ns = ns |
| 18 | self.name = str(name) |
| 19 | self.ctx = ctx |
| 20 | self.attrs = {} |
| 21 | self.children = [] |
| 22 | |
| 23 | def __call__(self, *children, **attrs): |
| 24 | for child in children: |
| 25 | self.ctx.addchild(self, child) |
| 26 | for k, v in attrs.items(): |
| 27 | self.ctx.addattr(self, k, v) |
| 28 | return self |
| 29 | |
| 30 | def __todom__(self, doc): |
| 31 | el = doc.createElementNS(self.ns, self.name) |
| 32 | for k, v in self.attrs.items(): |
| 33 | el.setAttribute(k, v) |
| 34 | for child in self.children: |
| 35 | el.appendChild(child.__todom__(doc)) |
| 36 | return el |
| 37 | |
| 38 | def __str__(self): |
| 39 | doc = xml.dom.minidom.Document() |
| 40 | return self.__todom__(doc).toxml() |
| 41 | |
| 42 | class context(object): |
| 43 | charset = (sys.getfilesystemencoding() or "ascii") |
| 44 | |
| 45 | def __init__(self): |
| 46 | self.nodeconv = {} |
| 47 | self.nodeconv[bytes] = lambda ob: text(ob, self.charset) |
| 48 | self.nodeconv[str] = text |
| 49 | self.nodeconv[int] = text |
| 50 | self.nodeconv[float] = text |
| 51 | |
| 52 | def nodefrom(self, ob): |
| 53 | if isinstance(ob, node): |
| 54 | return ob |
| 55 | if hasattr(ob, "__tonode__"): |
| 56 | return ob.__tonode__() |
| 57 | if type(ob) in self.nodeconv: |
| 58 | return self.nodeconv[type(ob)](ob) |
| 59 | return None |
| 60 | |
| 61 | def addchild(self, node, child): |
| 62 | if child is None: |
| 63 | return |
| 64 | new = self.nodefrom(child) |
| 65 | if new is not None: |
| 66 | node.children.append(new) |
| 67 | elif isinstance(child, collections.abc.Iterable): |
| 68 | for ch in child: |
| 69 | self.addchild(node, ch) |
| 70 | else: |
| 71 | raise Exception("No node conversion known for %s objects" % str(type(child))) |
| 72 | |
| 73 | def addattr(self, node, k, v): |
| 74 | if v is not None: |
| 75 | node.attrs[str(k)] = str(v) |
| 76 | |
| 77 | class constructor(object): |
| 78 | def __init__(self, ns, elcls=element, ctx=None): |
| 79 | self._ns = ns |
| 80 | self._elcls = elcls |
| 81 | if ctx is None: ctx = context() |
| 82 | self._ctx = ctx |
| 83 | |
| 84 | def __getattr__(self, name): |
| 85 | return self._elcls(self._ns, name, self._ctx) |
| 86 | |
| 87 | class doctype(node): |
| 88 | def __init__(self, rootname, pubid, dtdid): |
| 89 | self.rootname = rootname |
| 90 | self.pubid = pubid |
| 91 | self.dtdid = dtdid |