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javapoet-dsl's Issues

Can't escape usage of '%' in code blocks

I don't see any way to escape usages of % in code blocks, e.g.:

appendln(
    """
    xmlDictionary.registerEnumCodec(
        new ${'$'}T.Codec().asXmlCodec(),
        String.format("//xs:element[@name='%s']", "$typeName"),
        $typeName.getTypeId().local(namespaceTable).orElseThrow(
            () -> new IllegalStateException("namespace not registered: " + NAMESPACE_URI))
    )
    """.trimIndent(),
    ClassName.get(enumTypePackageName, typeName)
)

will fail with:

Exception in thread "main" java.lang.IllegalArgumentException: index 2 for '$s' not in range (received 1 arguments)
	at com.squareup.javapoet.Util.checkArgument(Util.java:53)
	at com.squareup.javapoet.CodeBlock$Builder.add(CodeBlock.java:287)
	at com.squareup.javapoet.CodeBlock$Builder.addStatement(CodeBlock.java:402)
	at com.squareup.javapoet.MethodSpec$Builder.addStatement(MethodSpec.java:480)
	at com.hendraanggrian.javapoet.MethodSpecBuilder.appendln(MethodSpecs.kt:155)

because of my usage of %s.

`nativeBuilder` field should be visible

I'm slowly converting some code to use this DSL and have found that I need access to the underlying nativeBuilder field to ease the transition.

For example, whilst in the middle of defining a type using the DSL, I need to define another inner type. The DSL offers these functions:

    override fun type(name: String, builder: (TypeSpecBuilder.() -> Unit)?) {
        nativeBuilder.addType(buildTypeSpec(name, builder))
    }

    override fun type(className: ClassName, builder: (TypeSpecBuilder.() -> Unit)?) {
        nativeBuilder.addType(buildTypeSpec(className, builder))
    }

but these require me to rewrite the code for the type I'm trying to add in the DSL as well. What I'd rather do in the meantime is something like:

nativeBuilder.addType(generateFooTypeSpec())

where generateFooTypeSpec() is a method that returns a JavaPoet TypeSpec.

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