Examples of com.google.gxp.compiler.schema.Schema

com.google.gxp.compiler.schema.Schema
A Schema represents an output language like XHTML, RSS, VoiceXML or some other XML language that you might want to generate via GXP. A schema can also optionally support an "SGML" mode. This is probably only useful for XHTML, whose SGML counterpart is HTML. Making it general is slightly easier (and less ugly) than special-casing it, so there you have it.
Schemas are generally specified in an XML file which is then parsed with SchemaParser.
Schemas are used by the GXP compiler to do input vaidation (for example, checking that an attribute really exists) and also for providing other special knowledge about attributes and elements. (eg: which attributes are boolean, and what doctypes are supported)
Most GXP users will probably not need to write schemas. Only one schema is required per output format. If you feel the urge to write a schema, first investigate to see if someone has already written one for the same language.


            public Void visitBundleType(BundleType type) {
              final AttributeValidator validator = type.getValidator(name);
              String innerContentTypeString = validator.getContentType();
              if (innerContentTypeString != null) {
                Schema innerSchema = schemaFactory.fromContentTypeName(innerContentTypeString);
                attrBundles.get(parameter.getPrimaryName()).put(validator,
                                                         updatedAttr.withInnerSchema(innerSchema));
              } else {
                attrBundles.get(parameter.getPrimaryName()).put(validator, updatedAttr);
              }

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    Visitor(AlertSink alertSink) {
      this.alertSink = Preconditions.checkNotNull(alertSink);
    }


    private Expression flattenDocType(OutputElement element, DocType docType) {
      Schema elementSchema = element.getSchema();
      Expression xmlDoctype =
          new StringConstant(element, elementSchema,
                             docType.toXml(element.getLocalName()));


      Expression sgmlDoctype;

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                             new IsXmlExpression(element, elementSchema),
                             xmlDoctype, sgmlDoctype);
    }


    private Expression flattenXmlns(OutputElement element) {
      Schema elementSchema = element.getSchema();
      String xmlns = elementSchema.getNamespaceUri();


      List<Expression> concatList = Lists.newArrayList();
      concatList.add(new StringConstant(element, elementSchema, " xmlns"));
      if (elementSchema.getTagPrefix() != null) {
        concatList.add(new StringConstant(element, elementSchema, ":"));
        concatList.add(new StringConstant(element, elementSchema,
                                          elementSchema.getTagPrefix()));
      }
      concatList.add(new StringConstant(element, elementSchema, "=\""));
      concatList.add(new StringConstant(element, elementSchema,
          CharEscapers.xmlEscaper().escape(xmlns)));
      concatList.add(new StringConstant(element, elementSchema, "\""));

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    @Override
    public Expression visitOutputElement(OutputElement element) {
      List<Expression> values = Lists.newArrayList();
      ElementValidator elementValidator = element.getValidator();
      Schema elementSchema = element.getSchema();
      String tagPrefix = elementSchema.getTagPrefix();
      DocType docType = element.getDocType();
      if (docType != null) {
        values.add(flattenDocType(element, docType));
      }
      values.add(new StringConstant(element, elementSchema, "<"));

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    /**
     * Constructs an Expression to output a boolean attribute.
     * Example: selected="selected" if in XML mode else selected
     */
    private Expression buildBooleanAttrExpression(Attribute attr, OutputElement element) {
      Schema elementSchema = element.getSchema();
      List<Expression> values = Lists.newArrayList();


      values.add(new StringConstant(attr, elementSchema," " + attr.getName()));
      values.add(new Conditional(
                     attr, elementSchema,

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    assertEquals(value, result.evaluate());
  }


  public void testEscape() throws Exception {
    Expression subexpression = expr("\"foo < bar\"");
    Schema schema = htmlSchema();


    EscapeExpression result =
        (EscapeExpression) escape(schema, subexpression);


    assertEquals(subexpression, result.getSubexpression());

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      if (phName == null) {
        return expr;
      }


      Schema exprSchema = expr.getSchema();
      List<Expression> values = Lists.newArrayList();


      values.add(new PlaceholderStart(expr, exprSchema, phName, null));
      values.add(expr);
      values.add(new PlaceholderEnd(expr, exprSchema));

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      String phName = element.getPhName();
      if (phName == null) {
        return super.visitOutputElement(element);
      }


      Schema elementSchema = element.getSchema();
      boolean whitespaceContent = element.getContent().alwaysOnlyWhitespace();
      List<Expression> values = Lists.newArrayList();


      String name = whitespaceContent ? phName : phName + "_start";
      values.add(new PlaceholderStart(element, elementSchema, name, null));

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      } else {
        node = attr;
        contentType = attr.getValue().getStaticString(alertSink, defaultValue);
      }


      Schema schema = (contentType == null)
          ? null
          : schemaFactory.fromContentTypeName(contentType);


      if (schema == null && contentType != null) {
        alertSink.add(new UnknownContentTypeError(node, contentType));

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      boolean hidden = attrMap.getBooleanValue("hidden");
      // TODO(laurence): coerce content to HTML
      Expression content = getCollapsableContent(attrMap);


      ContentType contentType = createContentType(node, null);
      Schema schema = (contentType == null) ? null : contentType.getSchema();


      output.accumulate(
          new UnextractedMessage(node, schema, name, meaning, comment, hidden, content));
      return null;
    }

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com.google.gxp.compiler.base.Conditional

com.google.gxp.compiler.bind.Binder$Visitor

com.google.gxp.compiler.escape.Escaper$Worker$Visitor

com.google.gxp.compiler.flatten.ContentFlattener$Visitor

com.google.gxp.compiler.GxpcTestCaseTest

com.google.gxp.compiler.parser.NamespaceSet

com.google.gxp.compiler.phinsert.PlaceholderInserter$Visitor

com.google.gxp.compiler.reparent.Reparenter$ElementVisitor

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