import color, method, mode
from lex import Grammar, PatternRule, RegionRule

class TagGrammar(Grammar):
    rules = [
        RegionRule(r'string', r'"', Grammar, r'"'),
        RegionRule(r'string', r"'", Grammar, r"'"),
        PatternRule(r'namespace', r'[a-zA-Z_]+:'),
        PatternRule(r'attrname', r'[^ =>\n]+(?==)'),
        PatternRule(r'name', r'[^/\[\] =>\n]+'),
    ]

class XMLGrammar(Grammar):
    rules = [
        # TODO: how does cdata work again?
        RegionRule(r'comment', r'<!--', Grammar, r'-->'),
        RegionRule(r'xml_tag', r'<', TagGrammar, r'/?>'),
        PatternRule(r'xml_entity', r'&.*?;'),
    ]

class XmlValidate(method.shell.Exec):
    '''Valid the buffer's contents as valid XML.'''
    show_success = True
    args         = []
    def _execute(self, w, **vargs):
        self._doit(w, w.buffer.path, 'xmlwf %(path)r', cmdname='xml-validate')

class XmlCreateTag(method.Method):
    ''''''
    args = [method.Argument('tagname', prompt="Tag Name: ", help="Create an open/close tag pair")]
    def _execute(self, w, **vargs):
        t = vargs['tagname']
        w.insert_string_at_cursor("<%s>" % t)
        p = w.logical_cursor()
        w.insert_string_at_cursor("</%s>" % t)
        w.goto(p)

class XML(mode.Fundamental):
    modename   = 'XML'
    extensions = ['.xml', '.xml.in', '.xsl', '.xsd']
    grammar    = XMLGrammar
    colors     = {
        'xml_tag.start':        ('default', 'default', 'bold'),
        'xml_tag.namespace':    ('magenta', 'default', 'bold'),
        'xml_tag.name':         ('blue', 'default', 'bold'),
        'xml_tag.attrname':     ('cyan', 'default', 'bold'),
        'xml_tag.string.start': ('green', 'default', 'bold'),
        'xml_tag.string.null':  ('green', 'default', 'bold'),
        'xml_tag.string.end':   ('green', 'default', 'bold'),
        'xml_tag.end':          ('default', 'default', 'bold'),
        'xml_entity':           ('magenta', 'default', 'bold'),
    }
    actions = [XmlValidate, XmlCreateTag]
    def __init__(self, w):
        mode.Fundamental.__init__(self, w)
        self.add_bindings('xml-create-tag', ('M-t',))

install = XML.install