[stringtemplate-interest] nesting one formatted string within another formatted string

[Eric B]

Thanks Udo!  That was exactly the type of syntax I was looking for.

Eric

On 1/30/11, Udo Borkowski <ub at abego-software.de> wrote:
> Hi Eric,
>
> instead of introducing an extra template ("jsEscape") you could also use
> anonymous templates. However you have to check from case to case what really
> is the better approach. E.g. extra templates with good names may make your
> templates more readable and better to maintain.
>
> Here a complete example.
>
> Assume you want to render a string in lowercase, with a capital letter. The
> example shows two ways to do this, one with extra templates (toLower/cap),
> and one using anonymous templates:
>
> toLower(s) ::= <<
> $s;format="lower"$
>>>
>
> cap(s) ::= <<
> $s;format="cap"$
>>>
>
> /*
> Render s in lower case, with a capitalized first letter.
>
> Version 1: referencing "helper" templates
> */
> toLowerAndCap(s) ::= <<
> $cap(s=(toLower(s=s)))$
>>>
>
> /*
> Render s in lower case, with a capitalized first letter.
>
> Version 2: "inline", with anonymous templates
> */
> toLowerAndCapAnon(s) ::= <<
> $({$s;format="lower"$});format="cap"$
>>>
>
> main() ::= <<
> $toLower(s="abC")$
> $cap(s="abC")$
> $toLowerAndCap(s="abC")$
> $toLowerAndCapAnon(s="abC")$
>>>
>
> This will output:
>
> abc
> AbC
> Abc
> Abc
>
>
> Udo
>
>
> On 30.01.2011, at 06:26, Eric B wrote:
>
>> Hi All,
>>
>> I'm building up an HTML string that should ultimately resolve to something
>> like the following where someString is unknown and could contain special
>> characters...
>> <img src="someImage.gif" onClick="javascript:alert('someString');"/>
>>
>> If someString really has special characters in it, it needs to be escaped
>> for JS and then entire onClick attribute value needs to be escaped for
>> HTML.
>>
>> To format the full attribute value as HTML with StringTemplate is no
>> problem:
>>
>> escapeTest(someString) ::= <<
>> <img src="someImage.gif" onClick="$"javascript:alert('" + someString +
>> "');";format="HTML"$"/>
>> >>
>>
>> And to format someString as JS without formatting the HTML is no problem .
>>  I do something like:
>> escapeTest(someString) ::= <<
>> <img src="someImage.gif"
>> onClick="javascript:alert('$someString;format="JS"$');"/>
>> >>
>>
>> But I could not figure out a way to use the format option on someString
>> when it's nested in a formatted expression.
>>
>> The most graceful way I could figure to do this was to JS escape with
>> another template... like so:
>> jsEscape(jsString) ::= <<
>> $jsString;format="JS"$
>> >>
>>
>> escapeTest(someString) ::= <<
>> <img src="someImage.gif" onClick="$"javascript:alert('" +
>> jsEscape(someString) + "');";format="HTML"$"/>
>> >>
>>
>> Does this seem the best I can do?  Or does the syntax support using an
>> in-line format on someString?
>>
>> Thanks!,
>>
>> Eric
>>
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>> http://www.antlr.org/mailman/listinfo/stringtemplate-interest
>
>

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