Function em

Lib/pagebot/toolbox/units.py:1869–1913

Create an Em instance. >>> u = em(1, base=32) >>> u.pt 32 >>> u.base = pt(34) >>> u.pt 34 >>> u = em(1.5, base=48) >>> u 1.5em >>> u.pt == 48*1.5 True

(v, *args, **kwargs)

#   Em

def em(v, *args, **kwargs):
    """Create an Em instance.

    >>> u = em(1, base=32)
    >>> u.pt
    32
    >>> u.base = pt(34)
    >>> u.pt
    34
    >>> u = em(1.5, base=48)
    >>> u
    1.5em
    >>> u.pt == 48*1.5
    True

    """
    u = None
    base = kwargs.get('base', EM_FONT_SIZE)
    # Default not used by Em.
    g = kwargs.get('g', 0)

    # If there are more arguments, bind them together in a list.
    if args:
        v = [v]+list(args)
    if isinstance(v, (tuple, list)):
        u = []

        # Recursively append.
        for uv in v:
            u.append(em(uv, base=base, g=g))
        u = tuple(u)
    elif isinstance(v, (int, float, RelativeUnit)):
        u = Em(v, base=base, g=g)
    elif isinstance(v, str):
        v = v.strip().lower()
        if v.endswith(Em.UNIT):
            v = asNumberOrNone(v[:-2])
            if v is not None:
                u = Em(v, base=base, g=g)
        # Something else, recursively try again.
        else:
            u = units(v, base=base, g=g)
            # Only makes sense for relative if the same.
            assert isinstance(u, Em)
    return u

class Em(RelativeUnit):
    """Em size is based on the current setting of the fontSize. Used in CSS