This article switches gears and attempts to use stringtemplate to generate a more. Defines a section that is quoted from another source. The following are top voted examples for showing how to use org. Stringtemplate is extremely simple to use and assumes no special relationship with a web server or engine. Stringtemplate articles enforcing strict modelview separation in template engines terence parr thu may 20, 2004. A stringtemplate is a document with holes in it where you can stick values. Since it seems that it will work, im working on a prototype using microsofts rdlc, populating a local report and then rendering it as an image to a memory stream. Stringtemplate does a roundrobin walk through the templates. It comes from terrence parr, the inventor of antlr. Stringtemplate is particularly good at code generators, multiple site skins, and internationalization localization. All the examples in the stringtemplate paper show about 10 lines of parserandstringtemplatebuilder code, and then a few lines of output code. This leaded me to search for other java template systems, and i stumbled across stringtemplate. In the previous chapter, you learned about html styling, using the html style attribute html also defines special elements for defining text with a special meaning html uses elements like and for formatting output, like bold or italic text formatting elements were designed to display special types of text bold text. But once you scale it up from c to c, youd now have more like 10 lines of parserandstringtemplatebuilder code, wrapping lines of code thats doing all this work.
Following are the details that user will be filling in. Stringtemplate implements a poor mans form of lazy evaluation by simply requiring that all attributes be computed a priori. If you click the save button, your code will be saved, and you get an url you can share with others. Appending strings together to compose templates is rather silly. If you omit this space, older browsers will have trouble. These examples are extracted from open source projects. Currently the templates must all live under a directory so that you can reference them as foo. Linking, using an absolute url linking, using a relative url changing the color of links removing the underline from links changing the target of a link an image as a link creating a bookmark link a link that breaks out of a frame a mailto link a mailto link with subject. To integrate antlrgenerated recognizers into your application, you will still need at least the runtime library.
Now, you arent really going to want to combine your templates in this way. Whenever you use the element, anything following it starts from the next line. Evaluates to the empty string if no such property is found. Calling toppdoc on a stringtemplate yields a doc with appropriate paragraphfill wrapping that can be rendered in the usual fashion. For example, lets assume a use case where an application has a form which will be filled by users to register and export the same as pdf file and print it for future use. Stringtemplate ignores everything outside of attribute expressions, treating it as just text to spit out when you call stringtemplate. One additional thing ive done at the end is to flatten the. The content can be made visible and rendered later by using javascript. In this post, i will try to introduce and explain why stringtemplate is a superb engine for doing code generation and why you should consider it if dealing with a code generation scenario. It can run the antlr tool to generate recognizers and can run the testrig grun on command line to test grammars. In code generation contexts, template engines are a good field for innovation and your choice will be with you probably for the full lifetime of your tool. Html cheat sheet new html5 tags included having the right html cheat sheet with all the important attributes for lists, forms, text formatting, and document structure can be a true lifesaver. If you are curious about combining templates you can find out more here. Dsls are generally very highlevel languages tailored to speci.
For example, here is a trivial example that i actually use for generating sql. This arose for the case with html tables where you want to alternate the color between rows. Why i dont use stringtemplate for language translation. That is, all attributes must be computed and pushed into a template before it is written to text. To add to or improve this documentation, fork the antlrstringtemplate4 repo then update this docindex. If you deploy a template with data, each time you visit it templateapply will render the content again.
Stringtemplate can play the role of the view in a j2ee web application, and can be used as a replacement for jspjstl. For projects that support packagereference, copy this xml. This tag is an example of an empty element, where you do not need opening and closing tags, as there is nothing to go in between them the tag has a space between the characters br and the forward slash. Mar 10, 2009 here is a brief example of using stringtemplate in a j2ee environment. Stringtemplate is a template engine library used for generating source code, web pages, emails, or any other formatted text output. Of course, parsing the string and extracting the property values with reflection every time would be very inefficient, so there are a some optimizations. Manages a group of named mutuallyreferential stringtemplate objects. Passing dynamic content to the stringtemplate and providing dynamic content to itext pdf using springboot application to generate html content in itext pdf. Examples of such output includes source code, web pages and emails. Also public methods are available outside of the current class, private methods are only available in the current class. Basic instances are provided of the stringtemplateshows and toselem class. Spring boot pdf itext integration with string template. Its distinguishing characteristic is that unlike other engines, it strictly enforces modelview separation.
Stringtemplate is a powerful tool that i cant hope to cover in just one blog post. If not defined locally as a formal argument, stringtemplate looks at the template that invoked the current template, and so on. The stringtemplate template engine speakright framework. A stringtemplate object can be rendered using templateapply stringtemplate, e 1, e 2, or using the form stringtemplate e 1, e 2, stringtemplate has the following options. If you are iterating through your own classes you can call to getters. Parts 1, 2 and 3 introduced stringtemplate through the use of simple sql, html and plain text examples. Use the template tag when you have html code you want to use over and over again, but not until you ask for it. Net code generation through stringtemplate codeproject. Stringtemplate offers tools to make this combination of partial templates very easy.
All the examples above are static, this allows me to use the methods without initializing the class. There is a newer prerelease version of this package available. The problem im having is finding a free way to print this kind of output from a service. The stringtemplate template engine is a popular choice for generating markup text in java. This is a fairly popular feature and you see it on websites that make stationary or party favors and decorations.
It is not meant to be a real life example, but more a proof of concept. Html formatting if you use a word processor, you must be familiar with the ability to make text bold, italicized, or underlined. For that reason, were going to share an html cheat sheet that will be useful for all of your web development projects. Before we look into the implementation, lets first understand what is all about stringtemplates. Specifies a default color, size, and font for all text in a document. Net is a template engine for generating formatted text output.
The template can be for html, xml, java, sql, or whatever. Please check frequently asked questions faq before asking questions on stackoverflow or stringtemplatediscussion list. Please check frequently asked questions faq before asking questions on stackoverflow or stringtemplate discussion list. Format, extracts the property values into an array, and calls string. Here is a brief example of using stringtemplate in a j2ee environment. Isolates a part of text that might be formatted in a different direction from other text outside it. An image an image height and width using attributes. Oct 01, 2018 dotnet add package stringtemplate4 version 4. For those who are chomping at the bit to learn more id recommend reading the official stringtemplate. Stringtemplate is a template engine that defines its own language grammar.
In this tutorials, we will see how to work with spring boot pdf with itext using string template. Stringtemplate also powers the antlr 3 and 4 code generator. This ide is a sophisticated editor for antlr v3v4 grammars as well as stringtemplate templates. There is not much dependencies to add to be able to use stringtemplate. Template stringtemplate mustache ctemplatepython quik airspeed castalian chameleon cheetah cubictemp django. You can use stringtemplate to generate your views in spring mvc quite easily. Introduction i already wrote about a web templating system named tiles.
Stringtemplate provides a system for intercepting an object before it gets turned into a string. Stringtemplate is not a system or engine or server. First, to learn more about stringtemplates philosophy, you can check out the very readable academic paper enforcing strict modelview separation in template engines nominated for best paper at www2004 most programs that emit source code or other text output are unstructured blobs of generation logic interspersed with print statements. To use this, we need to download the stringtemplate library. Speakright uses stringtemplate st for all its voicexml generation. The stringtemplate class parses your format string into one compatible with string. The template tag holds its content hidden from the client. Further, it does not assume anything about the structure of the template text. The example consist of a welcome and about page, each one using the same layout. Any type deriving toselem can be passed automatically as a stringtemplate attribute. When a flow object is rendered, it is first converted into a speechpage object. If youve never heard of stringtemplate or a template engine you might want to read either part 1 or the official stringtemplate documentation. Templateapply can be used to parse and apply a string template in one step.
It is designed to be embedded inside other applications and is distributed as a small library with no external dependencies except antlr used for parsing the stringtemplate template language. The primary classes of interest are st, stgroupdir, and stgroupfile. Content inside a template tag will not be rendered. Html cheat sheet in pdf and jpg new html5 tags included.
Generate pdf using string template this blog details about using a stringtemplate library to generate pdf documents dynamically. For part 2, i used itextsharp to programmatically load the template pdf, perform the replacements, and save out that new pdf. Stringtemplate breaks up your template into chunks of text and attribute expressions. Using stringtemplate with j2ee richard barabe mon mar 9, 2009 22. It enforce the separation of the display logic from the business logic, in example by disallowing variable. I dont know that i can address your question fully in a comment. St is particularly good at multitargeted code generators, multiple site skins, and internationalization localization. Note that, for single valued attributes, template application is like an alternate include syntax. Html phrase tags the phrase tags have been desicolgned for specific purposes, though they are displayed in a similar way as other basic tags like,, and, you. A simple templating engine, like stringtemplate, or even xslt outputting html would be fine. The stringtemplate class is part of a library called nstring, which also contains a few extension methods to make string manipulations easier.
1200 331 1484 1596 1462 329 981 1358 686 1406 1073 319 1585 622 1578 566 1330 522 110 1344 675 1398 686 1152 178 1087 49 273 1301 1386 726 1061 546 1100 558 1398 1292