Add mode for modal language

application.py

@@ -179,7 +179,7 @@ class Application(object):
             'awk', 'shell', 'shellmini', 'fstab', 'yacc', 'pipe', 'mbox',
             'error', 'lua', 'lily', 'forth', 'ebnf', 'colortest', 'go',
             'inform6', 'scala', 'markdown', 'roy', 'twine', 'idris', 'rust',
-            'bosatsu', 'tal',
+            'bosatsu', 'tal', 'modal',
         )
         for name in names:
             exec("import mode.%s; mode.%s.install(self)" % (name, name))

mode/modal.py

@@ -0,0 +1,43 @@
+from mode import Fundamental
+from lex import Grammar, PatternRule, RegionRule
+
+class DataGrammar(Grammar):
+    pass
+
+DataGrammar.rules = [
+    PatternRule('spaces', ' +'),
+    RegionRule('sequence', r'\(', DataGrammar, r'\)|$'),
+    PatternRule('register', r'\?[a-z]'),
+    PatternRule('word', r'[^() \n]+'),
+]
+
+class RuleGrammar(Grammar):
+    rules = [
+        PatternRule('spaces', ' +'),
+        RegionRule('group', r'\(', DataGrammar, r'\)|$'),
+        PatternRule('register', r'\?[a-z]'),
+        PatternRule('word', r'[^() \n]+'),
+    ]
+
+class ModalGrammar(Grammar):
+    rules = [
+        PatternRule('spaces', ' +'),
+        PatternRule('eol', r'\n'),
+        RegionRule('modal.rule', '<>', RuleGrammar, '\n|$'),
+        PatternRule('modal.lit', r'[^\n]+'),
+    ]
+
+class Modal(Fundamental):
+    name        = 'Modal'
+    extensions  = ['.modal']
+    grammar     = ModalGrammar
+    colors      = {
+        'modal.lit': ('cyan', 'default'),
+        'modal.rule.start': ('magenta', 'default'),
+        'register': ('yellow', 'default'),
+        'modal.rule.group.start': ('blue', 'default'),
+        'modal.rule.group.end': ('blue', 'default'),
+    }
+
+def install(*args):
+    Modal.install(*args)