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Laurian/handlebars.tag

Created September 14, 2017 23:59
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  1. Laurian created this gist Sep 14, 2017.
    49 changes: 49 additions & 0 deletions handlebars.tag
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,49 @@
    <%@ taglib prefix="c" uri="http://java.sun.com/jstl/core_rt"%>
    <%@ tag import="java.util.*" %>
    <%@ tag import="com.github.jknack.handlebars.io.TemplateLoader" %>
    <%@ tag import="com.github.jknack.handlebars.io.ServletContextTemplateLoader" %>
    <%@ tag import="com.github.jknack.handlebars.Handlebars" %>
    <%@ tag import="com.github.jknack.handlebars.Template" %>
    <%@ tag import="com.github.jknack.handlebars.Context" %>
    <%@ attribute name="template" required="true" %>
    <%@ attribute name="context" required="true" type="javax.servlet.jsp.PageContext" %>
    <%
    JspContext jspContext = getJspContext();
    TemplateLoader loader = new ServletContextTemplateLoader(((PageContext) jspContext).getServletContext(), "/templates", ".template.html");
    Handlebars handlebars = new Handlebars(loader);
    try {
    Template t = handlebars.compile(jspContext.getAttribute("template").toString());
    Map map = new HashMap();
    // request attrs
    // Enumeration attrs = ((PageContext) jspContext).getRequest().getAttributeNames();
    // current page context (just tag attrs)
    // Enumeration attrs = jspContext.getAttributeNamesInScope(PageContext.PAGE_SCOPE);
    // parent page context, passed via attr
    PageContext parentContext = (PageContext) jspContext.getAttribute("context");
    Enumeration attrs = parentContext.getAttributeNamesInScope(PageContext.PAGE_SCOPE);
    while(attrs.hasMoreElements()) {
    String name = attrs.nextElement().toString();
    // req attrs
    // map.put(name, ((PageContext) jspContext).getRequest().getAttribute(name));
    // current page context
    // map.put(name, jspContext.getAttribute(name));
    // parent page context
    // replicate attrs into current context too
    map.put(name, parentContext.getAttribute(name));
    jspContext.setAttribute(name, parentContext.getAttribute(name), PageContext.PAGE_SCOPE);
    }
    Context context = Context.newBuilder(map).build();
    %><%= t.apply(context) %><%
    // context.destroy();
    } catch (Exception e) {
    %><%= e %><%
    }
    %>