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from flask import Markup, escape
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from typing import List, Optional, Union, Tuple
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import types
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tag_names = ["a", "abbr", "acronym", "address", "applet", "area", "article", "aside", "audio", "b", "base", "basefont", "bdi", "bdo", "big", "blockquote", "body", "br", "button", "canvas", "caption", "center", "cite", "code", "col", "colgroup", "data", "datalist", "dd", "del", "details", "dfn", "dialog", "dir", "div", "dl", "dt", "em", "embed", "fieldset", "figcaption", "figure", "font", "footer", "form", "frame", "frameset", "head", "header", "hgroup", "h1", "h2", "h3", "h4", "h5", "h6", "hr", "html", "i", "iframe", "img", "input", "ins", "kbd", "keygen", "label", "legend", "li", "link", "main", "map", "mark", "menu", "menuitem", "meta", "meter", "nav", "noframes", "noscript", "object", "ol", "optgroup", "option", "output", "p", "param", "picture", "pre", "progress", "q", "rp", "rt", "ruby", "s", "samp", "script", "section", "select", "small", "source", "span", "strike", "strong", "style", "sub", "summary", "sup", "svg", "table", "tbody", "td", "template", "textarea", "tfoot", "th", "thead", "time", "title", "tr", "track", "tt", "u", "ul", "var", "video", "wbr"]
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class EscapeError(RuntimeError):
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pass
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def escape_attribute(x:str) -> str:
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return x.replace("&", "&ersand;").replace('"', """)
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def escape_attribute_name(x:str) -> str:
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for c in "<>='\" ":
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if c in x:
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raise EscapeError
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return x
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def escape_tag_name(x:str) -> str:
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return escape_attribute_name(x)
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Element = Union[str, Markup, 'Bucket']
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def indent_str(indent, s):
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return " "*indent + s + "\n" if indent is not None else s
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class Bucket:
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content: List[Element]
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is_paired: bool
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builder: 'Builder'
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def __init__(self, builder):
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self.builder = builder
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self.is_paired = False
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self.content = []
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self.before_tag = None
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def add(self, x: Element):
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if isinstance(x, types.FunctionType):
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before_current_tag = self.builder.current_tag
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self.builder.current_tag = self
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try:
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x(self)
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finally:
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self.builder.current_tag = before_current_tag
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else:
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self.is_paired = True
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self.content.append(x)
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def __call__(self, *arg, **kvarg):
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for i in arg:
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self.add(i)
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for k, v in kvarg.items():
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self.add_attribute(remove_leading_underscore(k), v)
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return self
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def add_tag(self, name: str, attributes: List[Tuple[str, str]]):
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t = Tag(self.builder, name, attributes)
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self.add(t)
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return t
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def line(self):
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t = Line(self.builder)
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self.add(t)
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return t
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def _line(self):
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return Line(self)
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def print(self):
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out = []
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self.serialize_append_to_list(out, 0)
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return Markup("".join(out))
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def print_file(self):
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out = ["<!DOCTYPE html>\n"]
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self.serialize_append_to_list(out, 0)
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return Markup("".join(out))
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def __enter__(self):
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if self.before_tag is not None:
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raise RuntimeError("Duplicit __enter__")
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self.before_tag = self.builder.current_tag
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self.builder.current_tag = self
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return self
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def __exit__(self, exc_type, exc_value, exc_traceback):
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if self.before_tag is None:
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raise RuntimeError("__exit__ before __enter__")
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self.builder.current_tag = self.before_tag
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self.before_tag = None
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class Tag(Bucket):
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name: str
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attributes: List[Tuple[str, str]]
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def __init__(self, builder, name: str, attributes: List[Tuple[str, str]]):
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super().__init__(builder)
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self.name = name
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self.attributes = attributes
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def add_attribute(k, v):
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self.attributes.append((k, v))
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def format_attributes(self):
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return " ".join(f'{escape_attribute_name(i[0])}="{escape_attribute(i[1])}"' for i in self.attributes)
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def serialize_append_to_list(self, out, indent):
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if self.is_paired:
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out.append(indent_str(indent, f"<{escape_tag_name(self.name)} {self.format_attributes()}>"))
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if indent is not None:
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indent += 1
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for i in self.content:
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if isinstance(i, Bucket):
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i.serialize_append_to_list(out, indent)
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elif isinstance(i, Markup):
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for j in i.__html__().split("\n"):
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out.append(indent_str(indent, j))
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else:
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for j in escape(str(i)).split("\n"):
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out.append(indent_str(indent, j))
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if indent is not None:
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indent -= 1
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out.append(indent_str(indent, f"</{escape_tag_name(self.name)}>"))
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else:
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out.append(indent_str(indent, f"<{escape_tag_name(self.name)} {self.format_attributes()} />"))
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class Line(Bucket):
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def serialize_append_to_list(self, out, indent):
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out.append(indent_str(indent,"")[:-1])
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for i in self.content:
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if isinstance(i, Bucket):
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i.serialize_append_to_list(out, None)
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elif isinstance(i, Markup):
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out.append(i.__html__())
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out.append(escape(str(i)))
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out.append("\n")
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class Builder:
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current_tag: Bucket
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root_tag: Bucket
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def __init__(self, tag: Bucket):
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self.root_tag = tag
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self.current_tag = tag
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def add_tag(self, name: str, attributes: List[Tuple[str, str]] = []):
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return self.current_tag.add_tag(name, attributes)
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def line(self):
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return self.current_tag.line()
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def _line(self):
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return Line(self)
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def __call__(self, *arg, **kvarg):
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self.current_tag(*arg, **kvarg)
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return self
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def print(self):
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return self.root_tag.print()
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def print_file(self):
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return self.root_tag.print_file()
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for name in tag_names:
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def run(name):
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def l1(self, *args, **kvarg):
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return self.add_tag(name, [(remove_leading_underscore(k), v) for k, v in kvarg.items()])(*args)
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def l2(self, *args, **kvarg):
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return Tag(self, name, [(remove_leading_underscore(k), v) for k, v in kvarg.items()])(*args)
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def l3(self, *args, **kvarg):
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return Tag(self.builder, name, [(remove_leading_underscore(k), v) for k, v in kvarg.items()])(*args)
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setattr(Builder, name, l1)
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setattr(Builder, f"_{name}", l2)
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setattr(Bucket, name, l1)
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setattr(Bucket, f"_{name}", l3)
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run(name)
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class HtmlBuilder(Builder):
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def __init__(self):
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super().__init__(Tag(self, "html", []))
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def remove_leading_underscore(s):
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if s == "":
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return s
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if s[0] == "_":
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return s[1:]
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return s
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class WrapAfterBuilder(Builder):
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def __init__(self, f):
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super().__init__(Bucket(self))
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self._wrap_done = False
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self._wrap_function = f
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def _wrap(self, *arg, **kvarg):
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if self._wrap_done:
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return
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self._wrap_done = True
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content = self.root_tag.content
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self.root_tag = None
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self.current_tag = None
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self.root_tag = self._wrap_function(self, content, *arg, **kvarg) or self.root_tag
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def print(self, *arg, **kvarg):
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self._wrap()
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return super().print(*arg, **kvarg)
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def print_file(self, *arg, **kvarg):
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self._wrap()
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return super().print_file(*arg, **kvarg)
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def WrapAfterBuilder_decorator(f):
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def l():
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return WrapAfterBuilder(f)
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return l
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