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is a 1kb JS templating engine, written for long-running single-page applications that render tens of thousands of DOM elements at a time.\n\nCaveman's markup language is built using an extensible macro system, which allows for arbitrary script execution, explicit logic, and partials. The library is lightweight (1kb compressed), has no dependencies, adds a single `Caveman` variable to the global namespace, and seems from [initial benchmark tests](#benchmarks) to be very fast, nearly as fast as native JS concatenation.\n\n## Installation\n\n```sh\nnpm install caveman\n```\n\n```sh\nbower install caveman\n```\n\n## Usage Examples\n\n### 1. Client-side Compilation & Rendering\n\nThis is an easy setup, but it's not as fast as precompiling your templates on the server (see below). This example assumes jQuery already exists on the page.\n\n```html\n\n\n\n\n
\n```\n\n### 2. Server-side Compilation, Client-side Rendering\n\nAssuming a node application with templates in `app/views/templates/*.html` and generated assets in `public/bundled`.\n\n1. Using Grunt and [grunt-caveman](https://github.com/andrewchilds/grunt-caveman), configure your Caveman task:\n\n ```js\n grunt.initConfig({\n caveman: {\n compile: {\n src: ['app/views/templates/*.html'],\n dest: 'public/bundled/templates.js'\n }\n }\n });\n\n grunt.loadNpmTasks('grunt-caveman');\n ```\n\n2. Run Grunt to generate your `templates.js` file. Partials will be named according to their file names, without the \".html\" extension.\n\n3. You should now have a Caveman template registry ready to go on the client-side:\n\n ```html\n \n \n \n ```\n\n### 3. Server-side Compilation and Rendering\n\nYou can also use Caveman for static site generation. Let's assume you have your caveman templates in `./templates` and generated assets in `./public`. Using Grunt and [grunt-caveman](https://github.com/andrewchilds/grunt-caveman), configure your Caveman task like so:\n\n```js\ngrunt.initConfig({\n caveman: {\n compile: {\n src: ['templates/*.html'],\n render: {\n // 'homePage' equates to templates/homePage.html\n 'homePage': 'public/index.html',\n 'aboutPage': 'public/about/index.html',\n 'contactPage': 'public/contact/index.html'\n }\n }\n }\n});\n\ngrunt.loadNpmTasks('grunt-caveman');\n```\n\n## Concepts\n\n### Escaping\n\nCaveman does not escape input by default, but you can enable that by setting `Caveman.options.escapeByDefault = true`. If you want to escape an individual string, you can do that with the `escape` macro:\n\n```html\n
{{- escape d.html }}
\n```\n\n### Scope\n\nCaveman doesn't use `with` blocks or do any scope lookup under the hood. Data is passed in to a Caveman template as the argument `d`, so instead of `{{foo}}` you use `{{d.foo}}`. Within `for` and `each` blocks, the scope of `d` becomes block-level, as illustrated here:\n\n```html\n
\n {{- for d.posts as post }}\n

{{post.title}}

\n {{- for post.images }}\n \n \"{{d.alt}}\"\n {{- end }}\n \n {{- for post.images as image }}\n \n \"{{image.alt}}\"\n \n {{d.posts[0].images[0].src}}\n {{- end }}\n {{- each post.images[0] }}\n \n {{_key}}: {{d}}\n {{- end }}\n {{- each post.images[0] as attr }}\n \n {{_key}}: {{attr}}\n \n {{d.posts[0].images[0].src}}\n {{- end }}\n {{- end }}\n
\n```\n\n### Custom Macros\n\nMacros can be added or modified quite easily, even after templates are compiled. For example, a \"tableClass\" macro that adds zebra stripes and \"first\" and \"last\" classes, depending on where it is in the array:\n\n```js\nCaveman.addMacro('tableClass', {\n find: /^tableClass$/,\n replace: \"str += (_i % 2 ? 'even' : 'odd');\" +\n \"if (_i === 0) { str += ' first'; }\" +\n \"if (_i === _len - 1) { str += ' last'; }\"\n});\n\ndata = {\n rows: [\n { text: 'a' }\n { text: 'b' }\n { text: 'c' }\n ]\n}\n\nCaveman(template, data)\n```\n\n```html\n\n\n {{- for d.rows as row }}\n \n \n \n {{- end }}\n
{{_i}}: {{row.text}}
\n\n\n\n \n \n \n \n \n \n \n \n \n
0: a
1: b
2: c
\n```\n\n### Arbitrary Script Execution\n\n```js\nCaveman(template, {\n rows: [1, 2, 3]\n});\n```\n\n```html\n\n{{- for d.rows }}\n
{{d}} x {{d}} = {{- print d * d }}
\n{{- end }}\n\n\n
1 x 1 = 1
\n
2 x 2 = 4
\n
3 x 3 = 9
\n```\n\n## Interpolation Behavior\n\n```html\n\nstring: {{d.strings}}\nempty string: {{d.emptyString}}\nboolean false: {{d.booleanFalse}}\nboolean true: {{d.booleanTrue}}\nnull: {{d.nullValue}}\nundefined: {{d.undefinedValue}}\nfloats: {{d.floats}}\nintegers: {{d.ints}}\nzero: {{d.zero}}\narrays (bracket notation): {{d.arrays[2]}}\narrays of objects (dot and bracket notation): {{d.arraysOfObjects[1].b}}\n```\n\n```js\nCaveman.render('exampleTemplate', {\n strings: \"123\",\n emptyString: '',\n booleanFalse: false,\n booleanTrue: true,\n nullValue: null,\n undefinedValue: undefined,\n floats: 123.12,\n ints: 1234,\n zero: 0,\n arrays: [1, 2, 3, 4]\n arraysOfObjects: [\n { a: 1, b: 2, c: 3 },\n { a: 1, b: 2, c: 3 }\n ]\n});\n```\n\n```html\n\nstring: 123\nempty string:\nboolean false: false\nboolean true: true\nnull:\nundefined:\nfloats: 123.12\nintegers: 1234\nzero: 0\narrays (bracket notation): 3\narrays of objects (dot and bracket notation): 2\n```\n\n## Macro Documentation\n\n#### {{- if *expression* }}\n#### {{- unless *expression* }}\n#### {{- else }}\n#### {{- else if *expression* }}\n#### {{- end }}\n\n```html\n
\n {{- for d.posts as post }}\n {{- unless post.hidden }}\n

{{post.title}}

\n {{- if post.comments.length > 0 }}\n {{- for post.comments as comment }}\n
{{comment.text}}
\n {{- end }}\n {{- else }}\n
No comments!
\n {{- end }}\n {{- end }}\n {{- end }}\n
\n```\n\nThe `if`, `unless`, and `end` macros have shortcuts, respectively:\n\n#### {{? *expression* }}\n#### {{^ *expression* }}\n#### {{/}}\n\n-----\n\n#### {{- for *array* }}\n#### {{- for *array* as *obj* }}\n\nThe `for` macro iterates through arrays. These variables are available in the block scope:\n\n* `_i` = the current index of the for loop, starting with zero\n* `_len` = the length of the for loop.\n\n```js\nvar data = {\n users: [\n { name: 'Jimmy', email: 'jimmy@gmail.com' },\n { name: 'Ralph', email: 'ralph@gmail.com' }\n ]\n};\nCaveman(template, data);\n```\n\n```html\n\n
\n {{- for d.users as user }}\n
\n {{user.name}}\n {{user.email}}\n
\n {{- end }}\n
\n\n\n
\n
\n Jimmy\n jimmy@gmail.com\n
\n
\n Ralph\n ralph@gmail.com\n
\n
\n```\n\n-----\n\n#### {{- each *obj* }}\n#### {{- each *obj* as *attr* }}\n\n`each` is meant for iterating through object properties, using a closure instead of a for loop. The `_key` variable is available in the block scope.\n\n```js\ndata = {\n cars: [\n {\n make: 'Volvo',\n model: '245s',\n year: 1976,\n },\n {\n make: 'Saab',\n model: '900s',\n year: 1985\n }\n ]\n};\n```\n\n```html\n\n{{- for d.cars as car }}\n
\n {{- each car as attribute }}\n
{{_key}}: {{attribute}}
\n {{- end }}\n
\n{{- end }}\n\n\n
\n
make: Volvo
\n
model: 245s
\n
year: 1976
\n
\n
\n
make: Saab
\n
model: 900s
\n
year: 1984
\n
\n```\n\n-----\n\n#### {{- with *a.b.c.obj* }}\n#### {{- with *a.b.c.obj* as *obj* }}\n\n`with` allows you to scope an object to `d` (or to a named variable using `with foo as bar`) within a block.\n\n```html\n\n{{- for d.posts as post }}\n {{- with post.author as author }}\n

{{author.name}}

\n {{- end }}\n{{- end }}\n```\n\n-----\n\n#### {{- print *expression* }}\n\n`print` writes the expression's returned value. The `_i` character is the current index of the array. `d` is the current value, which happens to be a string.\n\n```html\n\n{{- for d.rows }}\n
{{d}} x {{d}} = {{- print d * d }}
\n{{- end }}\n\n\n
1 x 1 = 1
\n
2 x 2 = 4
\n
3 x 3 = 9
\n```\n\n-----\n\n#### {{- log *expression* }}\n\nWrites {expression} to console.log.\n\n```js\n{{- log x.y.z }}\n```\n\n-----\n\n#### {{- render *partialName* }}\n#### {{- render *partialName* *context* }}\n\nRenders partial {name} using optional {scope}.\n\nCompiled templates should be registered using the `Caveman.register` method so they can be used as partials.\n\n```js\nCaveman.register('emailList', emailList)\nCaveman.register('emailLink', emailLink)\n\nvar data = {\n emails: [\n { email: 'jimmy@gmail.com', name: 'Jimmy' },\n { email: 'ralph@gmail.com', name: 'Ralph', className: 'active' },\n { email: 'joe@gmail.com', name: 'Joe' }\n ]\n};\nCaveman.render('emailList', data);\n```\n\n```html\n\n{{- for d.emails }}\n
{{- render emailLink }}
\n{{- end }}\n\n\n{{d.name}}\n\n\n
\n Jimmy\n
\n
\n Ralph\n
\n
\n Joe\n
\n```\n\n-----\n\n#### {{// *comment* }}\n\nAllows comments in a template without being included in the rendered output.\n\n```js\nvar template = 'Foo {{// This is a comment. }} bar';\n\nCaveman.register('commentExample', template);\nCaveman.render('commentExample');\n```\n\n```html\nFoo bar\n```\n\n-----\n\n#### {{- escape *expression* }}\n\nPrevent HTML/JS from being evaluated. You can enable this behavior globally by setting `Caveman.options.escapeByDefault = true`.\n\n```js\nvar data = {\n html: ' & \\''\n};\nvar template = '{{- escape d.html }}';\n\nCaveman.register('escapeExample', template);\nCaveman.render('escapeExample', data);\n```\n\n```html\n<script>alert("HELLO!");</script> & '\n```\n\n-----\n\n#### {{- unescape *expression* }}\n\nAllow HTML/JS to be evaluated, even if `Caveman.options.escapeByDefault` was already set to `true`.\n\n```js\nvar data = {\n html: ' & \\''\n};\nvar template = '{{- unescape d.html }}';\n\nCaveman.register('unescapeExample', template);\nCaveman.render('unescapeExample', data);\n```\n\n```html\n & '\n```\n\n## Method Reference\n\n#### Caveman\n\nReturns either a compiled template function, or the rendered HTML if data is passed in. The latter approach should not be used in production as the compiled template is not cached.\n\n```js\nCaveman(template) // returns compiled template function\nCaveman(template, data) // returns rendered HTML\n```\n\n-----\n\n#### Caveman.compile(*template*)\n\nReturns a compiled template string. If you're sending pre-compiled templates to the client, you should use this method, otherwise you don't really need to use this. If you're compiling templates on the client-side, you should just use `Caveman.register` and `Caveman.render`.\n\n```js\nvar template = '{{- for d.users as user }}{{user.name}}{{- end }}'\nvar compiled = Caveman.compile(template);\n\nCaveman.register('userNames', compiled);\n```\n\n-----\n\n#### Caveman.register(*templateName*, *uncompiledTemplateString*)\n#### Caveman.register(*templateName*, *compiledTemplateFunction*)\n\nRegister a partial {name} using template {template}, allowing it to be used later on with `Caveman.render`. Accepts both compiled and uncompiled templates.\n\n```js\nvar template = '{{- for d.users as user }}{{user.name}}{{- end }}'\nCaveman.register('userNames', template);\n```\n\n-----\n\n#### Caveman.render(*templateName*, *data*)\n\nRender a compiled template {name} using {data}.\n\n```js\nvar data = {\n users: [ { name: 'Mario' }, { name: 'Luigi' } ]\n}\nCaveman.render('userNames', data);\n// > \"MarioLuigi\"\n```\n\n-----\n\n#### Caveman.addMacro(*macroName*, *macroDefinition*)\n\nAdds or updates a macro {macroName} with macro {macro}. Macros are objects with the following keys:\n\n* find: Required. The regex to test the str against.\n* replace: Required. A string or function that returns a replacement expression.\n* blockEnd: Optional. If this is a block, what should be added during the matching {{- end }} macro.\n* prefix: Optional. If anything needs to be added at the beginning of the compiled template.\n* shortcut: Optional. Define a shortcut syntax for this macro.\n\nAll existing macros are defined using this method, for example:\n\n```js\nCaveman.addMacro('if', {\n find: /^if /,\n replace: function (str) {\n return str.replace(/^if (.*)/, 'if ($1) {');\n },\n blockEnd: '}',\n shortcut: {\n find: /^\\?\\s?/,\n replace: function (str) {\n return str.replace(/^\\?\\s?(.*)/, '- if $1');\n }\n }\n});\n\nCaveman.addMacro('print', {\n find: /^print /,\n replace: function (str) {\n return str.replace(/^print (.*)/, 'str += ($1);');\n }\n});\n```\n\n-----\n\n## Options\n\nTo use custom tags (e.g. ERB-style tags), override these two options before compiling your templates:\n\n```js\nCaveman.options.openTag = '<%'; // defaults to '{{'\nCaveman.options.closeTag = '%>'; // defaults to '}}'\n```\n\nRemove indentation by shrink wrapping your templates:\n\n```js\nCaveman.options.shrinkWrap = true; // defaults to false\n```\n\nAutomatically escape all input:\n\n```js\nCaveman.options.escapeByDefault = true; // defaults to false\n```\n\n## Benchmarks\n\nIf you only look at [pure rendering](http://jsperf.com/js-templating-performance/5) performance, Caveman shows a dramatic performance gain over Hogan, Handlebars and Lodash:\n\n![benchmark-without-dom](http://i.imgur.com/7wKwTwJ.png)\n\nHowever a more [real-world test](http://jsperf.com/js-templating-performance/4) that includes DOM manipulation shows a more modest improvement:\n\n![benchmark-with-dom](http://i.imgur.com/28xpRTv.png)\n\nYMMV.\n\n## Running the test suite\n\n```sh\nnpm test\n```\n\n## License\n\nMIT. Copyright © 2016 Andrew Childs\n","maintainers":[{"name":"andrewchilds","email":"ac@glomerate.com"}],"time":{"modified":"2022-06-13T05:42:27.987Z","created":"2014-02-23T04:58:24.928Z","0.1.0":"2014-02-23T04:58:24.928Z","0.1.1":"2014-07-02T21:32:30.623Z","0.1.3":"2014-07-03T02:31:11.601Z","0.1.4":"2015-12-01T16:56:08.689Z","0.1.5":"2016-06-22T15:26:41.473Z","0.1.6":"2016-06-22T17:54:36.457Z"},"readmeFilename":"README.md","homepage":"https://github.com/andrewchilds/caveman","keywords":["caveman","javascript","template","html"],"repository":{"type":"git","url":"git+https://github.com/andrewchilds/caveman.git"},"author":{"name":"Andrew Childs"},"bugs":{"url":"https://github.com/andrewchilds/caveman/issues"},"license":"MIT"}