Generate a series of nested switch statements to parse CSSPrimitiveValue units.

third_party/WebKit/Source/build/scripts/templates/CSSPrimitiveValueUnitTrie.cpp.tmpl

+{% from 'macros.tmpl' import trie_length_switch %}
+// Copyright 2016 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.
+
+#include "core/css/CSSPrimitiveValueUnitTrie.h"
+#include "core/css/CSSPrimitiveValue.h"
+
+namespace blink {
+
+namespace {
+
+template<typename CharacterType>
+CSSPrimitiveValue::UnitType cssPrimitiveValueUnitFromTrie(const CharacterType* data, unsigned length)
+{
+    DCHECK(data);
+    DCHECK(length);
+    {% macro trie_return_statement(unit_name) %}CSSPrimitiveValue::UnitType::{{unit_name}}{% endmacro %}
+    {{ trie_length_switch(length_tries, trie_return_statement, trie_return_statement(default_value), True) | indent(4) }}
+    return {{ trie_return_statement(default_value) }};

[Timothy Loh, 2016/05/13 06:54:48]

I think it's clearer to just return CSSPrimitiveValue::UnitType::Unknown, and
remove the default_value everywhere

+}
+
+} // namespace
+
+CSSPrimitiveValue::UnitType lookupCSSPrimitiveValueUnit(const LChar* characters8, unsigned length)
+{
+    return cssPrimitiveValueUnitFromTrie(characters8, length);
+}
+
+CSSPrimitiveValue::UnitType lookupCSSPrimitiveValueUnit(const UChar* characters16, unsigned length)
+{
+    return cssPrimitiveValueUnitFromTrie(characters16, length);
+}
+
+} // namespace blink
+