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Status](https://github.com/neuland/pug4j/actions/workflows/test.yaml/badge.svg)](https://github.com/neuland/pug4j/actions)\n\n# pug4j - a pug implementation written in Java\npug4j's intention is to be able to process pug templates in Java without the need of a JavaScript environment, while being **fully compatible** with the original pug syntax.\n\npug4j was formerly known as jade4j. Because of the naming change of the javascript version and the alignment to the featureset of pug.js (https://pugjs.org/) we decided to switch the name.\n \n## Contents\n\n- [Example](#example)\n- [Syntax](#syntax)\n- [Usage](#usage)\n- [Simple static API](#simple-api)\n- [Full API](#api)\n    - [Caching](#api-caching)\n    - [Output Formatting](#api-output)\n    - [Filters](#api-filters)\n    - [Helpers](#api-helpers)\n    - [Model Defaults](#api-model-defaults)\n    - [Template Loader](#api-template-loader)\n- [Expressions](#expressions)\n- [Reserved Words](#reserved-words)\n- [Framework Integrations](#framework-integrations)\n- [Breaking Changes in 2.0.0](#breaking-changes-2)\n- [Breaking Changes in 1.0.0](#breaking-changes-1)\n- [Authors](#authors)\n- [License](#license)\n\n\n## Example\n\nindex.pug\n\n```\ndoctype html\nhtml\n  head\n    title= pageName\n  body\n    ol#books\n      for book in books\n        if book.available\n          li #{book.name} for #{book.price} €\n```\n\nJava model\n\n```java\nList\u003cBook\u003e books = new ArrayList\u003cBook\u003e();\nbooks.add(new Book(\"The Hitchhiker's Guide to the Galaxy\", 5.70, true));\nbooks.add(new Book(\"Life, the Universe and Everything\", 5.60, false));\nbooks.add(new Book(\"The Restaurant at the End of the Universe\", 5.40, true));\n\nMap\u003cString, Object\u003e model = new HashMap\u003cString, Object\u003e();\nmodel.put(\"books\", books);\nmodel.put(\"pageName\", \"My Bookshelf\");\n```\n\nRunning the above code through `String html = Pug4J.render(\"./index.pug\", model)` will result in the following output:\n\n```html\n\u003c!DOCTYPE html\u003e\n\u003chtml\u003e\n  \u003chead\u003e\n    \u003ctitle\u003eMy Bookshelf\u003c/title\u003e\n  \u003c/head\u003e\n  \u003cbody\u003e\n    \u003col id=\"books\"\u003e\n      \u003cli\u003eThe Hitchhiker's Guide to the Galaxy for 5,70 €\u003c/li\u003e\n      \u003cli\u003eThe Restaurant at the End of the Universe for 5,40 €\u003c/li\u003e\n    \u003c/ol\u003e\n  \u003c/body\u003e\n\u003c/html\u003e\n```\n\n## Syntax\n\nSee also the original [https://github.com/pugjs/pug#syntax](https://github.com/pugjs/pug#syntax).\n\n## Usage\n\n### via Maven\n\nJust add following dependency definitions to your `pom.xml`.\n\n```xml\n\u003cdependency\u003e\n  \u003cgroupId\u003ede.neuland-bfi\u003c/groupId\u003e\n  \u003cartifactId\u003epug4j\u003c/artifactId\u003e\n  \u003cversion\u003e2.4.0\u003c/version\u003e\n\u003c/dependency\u003e\n```\n\n### Build it yourself\n\nClone this repository ...\n\n```bash\ngit clone https://github.com/neuland/pug4j.git\n```\n\n... build it using `maven` ...\n\n```bash\ncd pug4j\nmvn install\n```\n\n... and use the `pug4j-2.x.x.jar` located in your target directory.\n\n\u003ca name=\"simple-api\"\u003e\u003c/a\u003e\n## Simple static API\n\nParsing template and generating template in one step.\n\n```java\nString html = Pug4J.render(\"./index.pug\", model);\n```\n\nIf you use this in production you would probably do the template parsing only once per template and call the render method with different models.\n\n```java\nPugTemplate template = Pug4J.getTemplate(\"./index.pug\");\nString html = Pug4J.render(template, model);\n```\n\nStreaming output using a `java.io.Writer`\n\n```java\nPug4J.render(template, model, writer);\n```\n\n\u003ca name=\"api\"\u003e\u003c/a\u003e\n## Full API\n\nIf you need more control you can instantiate a `PugConfiguration` object.\nPug4J needs a Base path, so that it can determine the parent path. In the simple static API the basePath is empty.\nTo configure a basePath. You need to use the FileTemplateLoader or ClassPathTemplateLoader and set setBase(\"\").\nExample for template location: /root/dir/base/path/index.pug\n\n```java\nFileTemplateLoader fileLoader = new FileTemplateLoader(\"/root/dir/\");\nfileLoader.setBase(\"base/path\");\n\nPugConfiguration config = new PugConfiguration();\nconfig.setTemplateLoader(fileLoader);\n\nPugTemplate template = config.getTemplate(\"/index\");\n\nMap\u003cString, Object\u003e model = new HashMap\u003cString, Object\u003e();\nmodel.put(\"company\", \"neuland\");\n\nconfig.renderTemplate(template, model);\n```\nPug is now allowed to read all files below /root/dir/ but not in / and /root.\n\n\u003ca name=\"api-caching\"\u003e\u003c/a\u003e\n### Caching\n\nThe `PugConfiguration` handles template caching for you. If you request the same unmodified template twice you'll get the same instance and avoid unnecessary parsing.\n\n```java\nPugTemplate t1 = config.getTemplate(\"index.pug\");\nPugTemplate t2 = config.getTemplate(\"index.pug\");\nt1.equals(t2) // true\n```\n\nYou can clear the template and expression cache by calling the following:\n\n```java\nconfig.clearCache();\n```\n\nFor development mode, you can also disable caching completely:\n\n```java\nconfig.setCaching(false);\n```\n\n\u003ca name=\"api-output\"\u003e\u003c/a\u003e\n### Output Formatting\n\nBy default, Pug4J produces compressed HTML without unneeded whitespace. You can change this behaviour by enabling PrettyPrint:\n\n```java\nconfig.setPrettyPrint(true);\n```\n\nPug detects if it has to generate (X)HTML or XML code by your specified [doctype](https://github.com/pugjs/pug#syntax).\n\nIf you are rendering partial templates that don't include a doctype pug4j generates HTML code. You can also set the `mode` manually:\n\n```\nconfig.setMode(Pug4J.Mode.HTML);   // \u003cinput checked\u003e\nconfig.setMode(Pug4J.Mode.XHTML);  // \u003cinput checked=\"true\" /\u003e\nconfig.setMode(Pug4J.Mode.XML);    // \u003cinput checked=\"true\"\u003e\u003c/input\u003e\n```\n\n\u003ca name=\"api-filters\"\u003e\u003c/a\u003e\n### Filters\n\nFilters allow embedding content like `markdown` into your pug template:\n\n    :markdown\n      # headline\n      hello **world**\n\nwill generate\n\n    \u003ch1\u003eheadline\u003c/h1\u003e\n    \u003cp\u003ehello \u003cstrong\u003eworld\u003c/strong\u003e\u003c/p\u003e\n\npug4j comes with a `plain` and `cdata` filter. `plain` takes your input to pass it directly through, `cdata` wraps your content in `\u003c![CDATA[...]]\u003e`. You can add your custom filters to your configuration.\n\n    config.setFilter(\"markdown\", new MarkdownFilter());\n\nTo implement your own filter, you have to implement the `Filter` Interface. If your filter doesn't use any data from the model you can inherit from the abstract `CachingFilter` and also get caching for free. See the [neuland/jade4j-coffeescript-filter](https://github.com/neuland/jade4j-coffeescript-filter) project as an example.\n\n\u003ca name=\"api-helpers\"\u003e\u003c/a\u003e\n### Helpers\n\nIf you need to call custom java functions the easiest way is to create helper classes and put an instance into the model.\n\n```java\npublic class MathHelper {\n    public long round(double number) {\n        return Math.round(number);\n    }\n}\n```\n\n```java\nmodel.put(\"math\", new MathHelper());\n```\n\nNote: Helpers don't have their own namespace, so you have to be careful not to overwrite them with other variables.\n\n```\np= math.round(1.44)\n```\n\n\u003ca name=\"api-model-defaults\"\u003e\u003c/a\u003e\n### Model Defaults\n\nIf you are using multiple templates you might have the need for a set of default objects that are available in all templates.\n\n```java\nMap\u003cString, Object\u003e defaults = new HashMap\u003cString, Object\u003e();\ndefaults.put(\"city\", \"Bremen\");\ndefaults.put(\"country\", \"Germany\");\ndefaults.put(\"url\", new MyUrlHelper());\nconfig.setSharedVariables(defaults);\n```\n\n\u003ca name=\"api-template-loader\"\u003e\u003c/a\u003e\n### Template Loader\n\nBy default, pug4j searches for template files in your work directory. By specifying your own `FileTemplateLoader`, you can alter that behavior. You can also implement the `TemplateLoader` interface to create your own.\n\n```java\nTemplateLoader loader = new FileTemplateLoader(\"/templates/\", \"UTF-8\"); //Defines the path under which all templates are found. You can't include templates from parent directory \"/\"\nloader.setBase(\"my-maintemplates/\"); //the folder where all files starting with \"/\" are found. This where your main templates are.\nconfig.setTemplateLoader(loader);\n```\n* '/index' points to '/templates/my-maintemplates/index.pug'\n* 'index' points to '/templates/index.pug'\n\nThere is also a `ClasspathTemplateLoader` and `ReaderTemplateLoader`.\n\n\u003ca name=\"expressions\"\u003e\u003c/a\u003e\n## Expressions\n\nThe original pug implementation uses JavaScript for expression handling in `if`, `unless`, `for`, `case` commands, like this\n\n    - var book = {\"price\": 4.99, \"title\": \"The Book\"}\n    if book.price \u003c 5.50 \u0026\u0026 !book.soldOut\n      p.sale special offer: #{book.title}\n\n    each author in [\"artur\", \"stefan\", \"michael\",\"christoph\"]\n      h2= author\n\n### Jexl Expressionhandler (default)\nPug4j uses [JEXL](https://commons.apache.org/proper/commons-jexl/) for parsing and executing these expressions.\nJEXL syntax and behavior is very similar to ECMAScript/JavaScript and so closer to the original pug.js implementation. JEXL runs also much faster than GraalVM.\nIf your template don't relies too much on Javascript-Logic and gets almost everything from the model, this is a good choice.\n\nWe are using a slightly modified JEXL version which to have better control of the exception handling. JEXL now runs in a semi-strict mode, where non existing values and properties silently evaluate to `null`/`false` where as invalid method calls lead to a `PugCompilerException`.\n\u003ca name=\"reserved-words\"\u003e\u003c/a\u003e\n#### Reserved Words\n\nJEXL comes with the three builtin functions `new`, `size` and `empty`. For properties with this name the `.` notation does not work, but you can access them with `[]`.\n\n```\n- var book = {size: 540}\nbook.size // does not work\nbook[\"size\"] // works\n```\n\nYou can read more about this in the [JEXL documentation](https://commons.apache.org/proper/commons-jexl/reference/syntax.html#Language_Elements).\n\n\u003ca name=\"graalvm\"\u003e\u003c/a\u003e\n### GraalVM Expressionhandler (NEW! since 2.0.0 / experimental!)\nIf you want to use pure javascript expression handling, you can try out the new GraalJS Expression Handler. It supports native javascript expressions but is slower (really slow!) than the Jexl Expression Handler. You can configure it like this:\n\n```java\nPugConfiguration config = new PugConfiguration();\n\nconfig.setExpressionHandler(new GraalJsExpressionHandler());\n```\n\n\n\u003ca name=\"framework-integrations\"\u003e\u003c/a\u003e\n## Framework Integrations\n- [neuland/spring-pug4j](https://github.com/neuland/spring-pug4j) pug4j spring integration.\n- [vertx-web](https://vertx.io/docs/vertx-web/java/#_jade_template_engine) jade4j for [Vert.X](http://vertx.io/)\n\n\u003ca name=\"breaking-changes-2\"\u003e\u003c/a\u003e\n## Breaking Changes in 2.0.0\n- Classes are renamed to pug4j.\n- Default file extension is now .pug\n- Compiler Level has been raised to Java 8+\n- Syntax has been adapted to the most current pug version. (2.0.4)\n- Filter interface changed\n- Interpolations not supported in attributes and filters anymore. It now behaves the same way as in pug.js.\n\n\u003ca name=\"breaking-changes-1\"\u003e\u003c/a\u003e\n### Breaking Changes in 1.3.1\n- Fixed a mayor scoping bug in loops. Use this version and not 1.3.0\n\n### Breaking Changes in 1.3.0\n- setBasePath has been removed from JadeConfiguration. Set folderPath on FileTemplateLoader instead.\n- Scoping of variables in loops changed, so its more in line with jade. This could break your template.\n\n### Breaking Changes in 1.2.0\n- Breaking change in filter interface: if you use filters outside of the project, they need to be adapted to new interface\n\n### Breaking Changes in 1.0.0\nIn Version 1.0.0 we added a lot of features of JadeJs 1.11. There are also some Breaking Changes:\n- Instead of 'id = 5' you must use '- var id = 5'\n- Instead of 'h1(attributes, class = \"test\")' you must use 'h1(class= \"test\")\u0026attributes(attributes)'\n- Instead of '!!! 5' you must use 'doctype html'\n- Jade Syntax for Conditional Comments is not supported anymore\n- Thanks to rzara for contributing to issue-108\n\n\n\u003ca name=\"authors\"\u003e\u003c/a\u003e\n## Authors\n\n- Artur Tomas / [atomiccoder](https://github.com/atomiccoder)\n- Stefan Kuper / [planetk](https://github.com/planetk)\n- Michael Geers / [naltatis](https://github.com/naltatis)\n- Christoph Blömer / [chbloemer](https://github.com/chbloemer)\n\nSpecial thanks to [TJ Holowaychuk](https://github.com/visionmedia) the creator of jade!\n\n\u003ca name=\"license\"\u003e\u003c/a\u003e\n## License\n\nThe MIT License\n\nCopyright (C) 2011-2025 [neuland Büro für Informatik](http://www.neuland-bfi.de/), Bremen, Germany\n\nPermission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the \"Software\"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:\n\nThe above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fneuland%2Fpug4j","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fneuland%2Fpug4j","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fneuland%2Fpug4j/lists"}