Experimental lexer generator / utf16 support: Fix + add test files.

tools/lexer_generator/code_generator.jinja

 #include "lexer/even-more-experimental-scanner.h"
 
 {%- macro do_key(key) -%}
   {%- for r in key -%}
     {%- if not loop.first %} || {% endif -%}
     {%- if r[0] == 'LATIN_1' -%}
       {%- if r[1][0] == r[1][1] -%}
         yych == {{r[1][0]}}
       {%- elif r[1][0] == 0 -%}
         yych <= {{r[1][1]}}
       {%- elif r[1][1] == 255 -%}
         yych >= {{r[1][0]}}
       {%- else -%}
         ({{r[1][0]}} <= yych && yych <= {{r[1][1]}})
       {%- endif -%}
     {%- elif r[0] == 'CLASS' -%}
       {%- if r[1] == 'eos' -%}
         (yych == 0 && cursor_ >= buffer_end_)
       {%- elif r[1] == 'zero' -%}
         (yych == 0 && cursor_ < buffer_end_)
       {%- elif r[1] == 'whitespace' and encoding == 'utf16'-%}
-        unicode_cache_->IsWhiteSpace(yych)
+        {# FIXME: Add and use unicode_cache_->InNonAsciiWhitespace #}
+        (yych != ' ' && yych != '\t' && yych != '\v' && yych != '\f' && yych != '\r' && yych != '\n' && unicode_cache_->IsWhiteSpace(yych))
       {%- elif r[1] == 'letter' and encoding == 'utf16'-%}
         {# FIXME: Add and use unicode_cache_->InNonAsciiLetter #}
         (!(yych >= 'a' && yych <= 'z') && !(yych >= 'A' && yych <= 'Z') &&  unicode_cache_->IsLetter(yych))
       {%- elif r[1] == 'identifier_part_not_letter' and encoding == 'utf16'-%}
         unicode_cache_->IsIdentifierPartNotLetter(yych)
       {%- else -%}
         false /* {{r[1]}} */
       {%- endif -%}
     {%- else -%}
       false
@@ skipping 168 matching lines @@
 {% endif -%}
     {{dispatch_action(default_action[0], default_action[1])}}
   FORWARD();
   goto code_start;
 
   fell_through:
   CHECK(false);
 }
 } }