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A Java implementation of the Liquid templating engine backed up by an ANTLR grammar.

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package liqp.filters;

import liqp.TemplateContext;

import java.util.ArrayList;
import java.util.List;

public class Compact extends Filter {

    @Override
    public Object apply(Object value, TemplateContext context, Object... params) {

        if (!super.isArray(value)) {
            return value;
        }

        Object[] values = super.asArray(value, context);
        List