[WebAgent API]: Implement name style handling.

third_party/WebKit/Source/bindings/scripts/name_style_converter.py

+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# pylint: disable=import-error,print-statement,relative-import
+
+import re
+
+SPECIAL_PREFIXES = [
+    'WebGL',
+    'SVG',
+]
+
+MATCHING_EXPRESSION = '((?:[A-Z][a-z]+)|[0-9]D?$)'
+
+
+class SmartTokenizer(object):
+    """Detects special cases that are not easily discernible without additional
+       knowledge, such as recognizing that in SVGSVGElement, the first two SVGs
+       are separate tokens, but WebGL is one token."""
+
+    def __init__(self, name):
+        self.remaining = name
+
+    def detect_special_prefix(self):
+        for prefix in SPECIAL_PREFIXES:
+            if self.remaining.startswith(prefix):
+                result = self.remaining[:len(prefix)]
+                self.remaining = self.remaining[len(prefix):]
+                return result
+        return None
+
+    def tokenize(self):
+        prefix = self.detect_special_prefix()
+        return filter(None,
+                      [prefix] + re.split(MATCHING_EXPRESSION, self.remaining))
+
+
+class NameStyleConverter(object):
+    """Converts names from camelCase and other styles to various other styles.
+    """
+
+    def __init__(self, name):
+        self.tokens = self.tokenize(name)
+
+    def tokenize(self, name):
+        tokenizer = SmartTokenizer(name)
+        return tokenizer.tokenize()
+
+    def to_snake_case(self):
+        """Snake case is the file and variable name style per Google C++ Style
+           Guide:
+           https://google.github.io/styleguide/cppguide.html#Variable_Names
+
+           Also known as the hacker case.
+           https://en.wikipedia.org/wiki/Snake_case
+        """
+        return '_'.join([token.lower() for token in self.tokens])
+
+    def to_upper_camel_case(self):
+        """Upper-camel case is the class and function name style per
+           Google C++ Style Guide:
+           https://google.github.io/styleguide/cppguide.html#Function_Names
+
+           Also known as the PascalCase.
+           https://en.wikipedia.org/wiki/Camel_case.
+        """
+        return ''.join([token[0].upper() + token[1:] for token in self.tokens])
+
+    def to_macro_case(self):
+        """Macro case is the macro name style per Google C++ Style Guide:
+           https://google.github.io/styleguide/cppguide.html#Macro_Names
+        """
+        return '_'.join([token.upper() for token in self.tokens])
+
+    def to_all_cases(self):
+        return {
+            'snake_case': self.to_snake_case(),
+            'upper_camel_case': self.to_upper_camel_case(),
+            'macro_case': self.to_macro_case(),
+        }