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'/?>'),
    ]

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 XML(mode.Fundamental):
    modename   = 'XML'
    extensions = ['.xml', '.xml.in']
    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'),
    }
    actions = [XmlValidate]

install = XML.install