[stringtemplate-interest] File based templates and maps.

[Caleb Lyness]

Terence Parr wrote:
> On Oct 19, 2006, at 11:53 PM, John Snyders wrote:
>
>   
>> There are many characters that can't be used as a map key without  
>> enclosing
>> in ().
>> I don't think it matters if the map is declared in code or in the  
>> group
>> file.
>>     
>
>   actually yes that is true-- the key is a string so doesn't matter  
> during the definition.  When you pull it out though, we are  
> overloading the dot operator which requires an identifier.
>   
So  noted.
>   
>> It has to do with what is allowed after . in an attribute reference
>> atom DOT ID is allowed where atom is ID, STRING, INT, or  
>> ANONYMOUS_TEMPLATE.
>>
>> So if your map key is "a:.b" or even "first" $map.a:.b$ and  
>> $map.first$
>> won't work.
>>     
>
> does $map.("a:.b")$ work?
>   
Yes. Looks a bit nasty: but here is an example:

        String templateGroupDef = "group test; \n"+
                               "aMap ::= [ \n"+
                                   "\"a:.b\":     \"A Test\"\n"+
                               "]\n"+
                               "templ() ::= \"<aMap.(\\\"a:.b\\\")>\"";

        StringTemplateGroup group = new StringTemplateGroup(new
StringReader(templateGroupDef));
        System.out.println(templateGroupDef);
        System.out.println(group.getInstanceOf("templ").toString()); 

This gives you:

group test;
aMap ::= [
"a:.b":     "A Test"
]
templ() ::= "<aMap.(\"a:.b\")>"
A Test
>   
>> So I'm not sure this (integer keys) is a bug but I'm still confused  
>> as to
>> why ST needs to parse integers at all.
>>     
>
>   yes, ST should not parse integers.  $map.("1")$ should work.
>   
It does work. Probably should change status from bug to "caveat"

Cheers
    Caleb.

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