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From Jean-Baptiste BRIAUD -- Novlog <j-b.bri...@novlog.com>
Subject Re: Directive indenting ?
Date Thu, 12 May 2011 08:49:48 GMT
I'm sorry, I had to give up as I was not able to load my resource while using it.
I have no time for trying more.

Here is the version using the StringBuilder.

import org.apache.velocity.runtime.resource.loader.FileResourceLoader;

import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;

public class StructuredGlobbingResourceLoader extends FileResourceLoader {
    public static String FOLDER;

    public static class VTLIndentationGlobber extends FilterInputStream {
        protected StringBuffer buffer = new StringBuffer(AbstractTemplateEngine.BUFFER_SIZE);
        protected int bufpos = 0;


        protected enum State {
            defstate, hash, comment, directive, schmoo, eol, eof
        }

        protected State state = State.defstate;

        public VTLIndentationGlobber(InputStream is) {
            super(is);
        }

        private void cleanBuffer() {
            buffer.delete(0, buffer.length());
        }

        // TODO - multiline comments #* ... *# not taken into account for now in all cases
        public int read() throws IOException {
            while (true) {
                switch (state) {
                    case defstate: {
                        int ch = in.read();
                        switch (ch) {
                            case (int) '#':
                                state = State.hash;
                                cleanBuffer();
                                bufpos = 0;
                                return ch;
                            case (int) ' ':
                            case (int) '\t':
                                buffer.append((char) ch);
                                break;
                            case -1:
                                state = State.eof;
                                break;
                            default:
                                buffer.append((char) ch);
                                state = State.schmoo;
                                break;
                        }
                        break;
                    }
                    case eol:
                        if (bufpos < buffer.length()) return (int) buffer.charAt(bufpos++);
                        else {
                            state = State.defstate;
                            cleanBuffer();
                            bufpos = 0;
                            return '\n';
                        }
                    case eof:
                        if (bufpos < buffer.length()) return (int) buffer.charAt(bufpos++);
                        else return -1;
                    case hash: {
                        int ch = (int) in.read();
                        switch (ch) {
                            case (int) '#':
                                state = State.directive;
                                return ch;
                            case -1:
                                state = State.eof;
                                return -1;
                            default:
                                state = State.directive;
                                cleanBuffer();
                                buffer.append("##");
                                return ch;
                        }
                    }
                    case directive: {
                        int ch = (int) in.read();
                        if (ch == (int) '\n') {
                            state = State.eol;
                            break;
                        } else if (ch == -1) {
                            state = State.eof;
                            break;
                        } else return ch;
                    }
                    case schmoo: {
                        int ch = (int) in.read();
                        if (ch == (int) '\n') {
                            state = State.eol;
                            break;
                        } else if (ch == -1) {
                            state = State.eof;
                            break;
                        } else {
                            buffer.append((char) ch);
                            return (int) buffer.charAt(bufpos++);
                        }
                    }
                }
            }
        }

        public int read(byte[] b, int off, int len) throws IOException {
            int i;
            int ok = 0;
            while (len-- > 0) {
                i = read();
                if (i == -1) return (ok == 0) ? -1 : ok;
                b[off++] = (byte) i;
                ok++;
            }
            return ok;
        }

        public int read(byte[] b) throws IOException {
            return read(b, 0, b.length);
        }

        public boolean markSupported() {
            return false;
        }
    }

    @Override
    public synchronized InputStream getResourceStream(String name) {
        final String ressource = name;
        return new VTLIndentationGlobber(super.getResourceStream(ressource));
    }
}


On 23 mars 2011, at 14:04, Jean-Baptiste BRIAUD -- Novlog wrote:

> OK, I'll try the FileResourceLoader as it failed at runtime with the WebappResourceLoader.
> I already change the code to use StringBuilder.
> 
> I'll share it with pleasure !
> Let me just validate it work for me with the FileResourceLoader.
> 
> On 23 mars 2011, at 14:01, Claude Brisson wrote:
> 
>> As noted on the wiki page, this custom resource loader extends WebappResourceLoader
but you can do exactly the same while extending FileResourceLoader.
>> 
>> If you do so, be sure to share it! Also, the code could probably be optimized a bit
(for instance by using a StringBuilder instead of a String for its inner buffer).
>> 
>> 
>> Claude
>> 
>> On 2011-03-23 10:47, Jean-Baptiste BRIAUD -- Novlog wrote:
>>> It doesn't compile :
>>> the WebappResourceLoader class is not found.
>>> I guess it is in the velocity-tool.jar extra lib ... I'll try, I have several
emergency in parallel :-)
>>> If my guess is correct, I'll just have to add a new dependency on my project.
>>> I'll let you know.
>>> 
>>> On 22 mars 2011, at 17:20, Claude Brisson wrote:
>>> 
>>>> It's a very straightforward input filter that uses the common resource loading
API - it should work well with 1.7.
>>>> 
>>>> It's the filter itself that should be considered beta.
>>>> 
>>>> Claude
>>>> 
>>>> On 2011-03-22 14:33, Jean-Baptiste BRIAUD -- Novlog wrote:
>>>>> Does it work with current 1.7 (latest stable) version or should I migrate
to V2 beta ?
>>>>> If yes, is that beta version stable enough ?
>>>>> 
>>>>> On 22 mars 2011, at 11:41, Jean-Baptiste BRIAUD -- Novlog wrote:
>>>>> 
>>>>>> Thanks for the pointer ! For years, I was thinking it was not possible.
>>>>>> 
>>>>>> On 21 mars 2011, at 20:52, Claude Brisson wrote:
>>>>>> 
>>>>>>> Yet, you can check a custom resource loader available on the
wiki that does precisely this:
>>>>>>> http://wiki.apache.org/velocity/StructuredGlobbingResourceLoader
>>>>>>> 
>>>>>>> 
>>>>>>> Claude
>>>>>>> 
>>>>>>> On 2011-03-21 19:50, Sergiu Dumitriu wrote:
>>>>>>>> On 03/21/2011 07:04 PM, Rich Wagner wrote:
>>>>>>>>> Sorry in advance if this is a FAQ whose answer I haven't
found...
>>>>>>>>> 
>>>>>>>>> Instead of writing:
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> #foreach( $container in $Containers )
>>>>>>>>> #if( $container.prop("Generate") )
>>>>>>>>>   ...stuff...
>>>>>>>>> #end
>>>>>>>>> #end
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> I'd like to indent the "#if" and its "#end", for the
sake of better readability:
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> #foreach( $container in $Containers )
>>>>>>>>>   #if( $container.prop("Generate") )
>>>>>>>>>   ...stuff...
>>>>>>>>>   #end
>>>>>>>>> #end
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> But then I find the spaces before the "#if" and its matching
"#end" show up in the output, which I don't want to happen.
>>>>>>>>> 
>>>>>>>>> To get around this, I've implemented a somewhat hack-ish
Template preprocesser:  my resource loader wraps a template's stream inside my own stream
implementation which filters template lines.  That is, if a line starts with "<white-space>#blah",
the initial spaces are trimmed off.
>>>>>>>>> 
>>>>>>>>> That works, and isn't all that intrusive.  But if "off-the-shelf"
Velocity already provides an easier way to accomplish the same thing, I'd prefer that...
>>>>>>>> No, there's no similar feature directly in Velocity yet.
>>>>>>>> 
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>>>>> 
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>> 
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> 
> 
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