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

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

 {% from 'macros.tmpl' import license %}
+{% from 'macros.tmpl' import trie_length_switch %}
+{% macro trie_return_statement(tag) %}
+    return {{tag}}Tag.localName().impl();
+{% endmacro %}
 {{license()}}
-{% macro trie_switch(trie, index) %}
-{# FIXME: No need to switch if there's only a single item in the subtrie:
-   can just have an if statement as we're currently doing for leaves. #}
-switch (data[{{index}}]) {
-{% for char, subtrie, tag, conditions in trie %}
-case '{{char}}':
-    {% if subtrie %}{# Recurse on subtrie #}
-    {{trie_switch(subtrie, index + 1) | indent}}
-    {% elif conditions %}{# Check suffix #}
-    if ({{conditions | join(' && ')}})
-        return {{tag}}Tag.localName().impl();
-    return 0;
-    {% else %}{# Terminal node (no suffix) #}
-    return {{tag}}Tag.localName().impl();
-    {% endif %}
-{% endfor %}
-}
-return 0;
-{% endmacro %}
 
 #include "{{namespace}}ElementLookupTrie.h"
 
 #include "{{namespace}}Names.h"
 
 namespace blink {
 
 using namespace {{namespace}}Names;
 
 StringImpl* lookup{{namespace}}Tag(const UChar* data, unsigned length)
 {
-    ASSERT(data);
-    ASSERT(length);
-    switch (length) {
-    {% for length, trie in length_tries %}
-    case {{length}}:
-        {{trie_switch(trie, 0) | indent(8)}}
-    {% endfor %}
-    }
-    return 0;
+    DCHECK(data);
+    DCHECK(length);
+    {{trie_length_switch(empty_case_return_value, length_tries, trie_return_statement, '0')}}
 }
 
 } // namespace blink