def getGlyph(gname, font):
    return font[gname] if font.has_key(gname) else None


def getComponentByName(f, g, componentName):
    for c in g.components:
        if c.baseGlyph == componentName:
            return c

def getAnchorByName(g,anchorName):
    for a in g.anchors:
        if a.name == anchorName:
            return a


def alignComponentToAnchor(f,glyphName,baseName,accentName,anchorName):
    g = getGlyph(glyphName,f)
    base = getGlyph(baseName,f)
    accent = getGlyph(accentName,f)
    if g == None or base == None or accent == None:
        return
    a1 = getAnchorByName(base,anchorName)
    a2 = getAnchorByName(accent,"_" + anchorName)
    if a1 == None or a2 == None:
        return
    offset = (a1.x - a2.x, a1.y - a2.y)
    c = getComponentByName(f, g, accentName)
    c.offset = offset

def alignComponentsToAnchors(f,glyphName,baseName,accentNames):
    for a in accentNames:
        if len(a) == 1:
            continue
        alignComponentToAnchor(f,glyphName,baseName,a[0],a[1])