1 files changed, 139 insertions, 0 deletions
diff --git a/lib/models/templateEngine.js b/lib/models/templateEngine.js
new file mode 100644
index 0000000..243bfc6
--- /dev/null
+++ b/lib/models/templateEngine.js
@@ -0,0 +1,139 @@
+var nunjucks = require('nunjucks');
+var Immutable = require('immutable');
+
+var TemplateEngine = Immutable.Record({
+    // Map of {TemplateBlock}
+    blocks:     Immutable.Map(),
+
+    // Map of Extension
+    extensions: Immutable.Map(),
+
+    // Map of filters: {String} name -> {Function} fn
+    filters:    Immutable.Map(),
+
+    // Map of globals: {String} name -> {Mixed}
+    globals:    Immutable.Map(),
+
+    // Context for filters / blocks
+    context:    Object(),
+
+    // Nunjucks loader
+    loader:     nunjucks.FileSystemLoader('views')
+}, 'TemplateEngine');
+
+TemplateEngine.prototype.getBlocks = function() {
+    return this.get('blocks');
+};
+
+TemplateEngine.prototype.getGlobals = function() {
+    return this.get('globals');
+};
+
+TemplateEngine.prototype.getFilters = function() {
+    return this.get('filters');
+};
+
+TemplateEngine.prototype.getShortcuts = function() {
+    return this.get('shortcuts');
+};
+
+TemplateEngine.prototype.getLoader = function() {
+    return this.get('loader');
+};
+
+TemplateEngine.prototype.getContext = function() {
+    return this.get('context');
+};
+
+TemplateEngine.prototype.getExtensions = function() {
+    return this.get('extensions');
+};
+
+/**
+    Return a block by its name (or undefined)
+
+    @param {String} name
+    @return {TemplateBlock}
+*/
+TemplateEngine.prototype.getBlock = function(name) {
+    var blocks = this.getBlocks();
+    return blocks.find(function(block) {
+        return block.getName() === name;
+    });
+};
+
+/**
+    Return a nunjucks environment from this configuration
+
+    @return {Nunjucks.Environment}
+*/
+TemplateEngine.prototype.toNunjucks = function() {
+    var loader = this.getLoader();
+    var blocks = this.getBlocks();
+    var filters = this.getFilters();
+    var globals = this.getGlobals();
+    var extensions = this.getExtensions();
+    var context = this.getContext();
+
+    var env = new nunjucks.Environment(
+        loader,
+        {
+            // Escaping is done after by the asciidoc/markdown parser
+            autoescape: false,
+
+            // Syntax
+            tags: {
+                blockStart: '{%',
+                blockEnd: '%}',
+                variableStart: '{{',
+                variableEnd: '}}',
+                commentStart: '{###',
+                commentEnd: '###}'
+            }
+        }
+    );
+
+    // Add filters
+    filters.forEach(function(filterFn, filterName) {
+        env.addFilter(filterName, filterFn.bind(context));
+    });
+
+    // Add blocks
+    blocks.forEach(function(block) {
+        var extName = block.getExtensionName();
+        var Ext = block.toNunjucksExt(context);
+
+        env.addExtension(extName, new Ext());
+    });
+
+    // Add globals
+    globals.forEach(function(globalValue, globalName) {
+        env.addGlobal(globalName, globalValue);
+    });
+
+    // Add other extensions
+    extensions.forEach(function(ext, extName) {
+        env.addExtension(extName, ext);
+    });
+
+    return env;
+};
+
+/**
+    Create a template engine
+
+    @param {Object} def
+    @return {TemplateEngine}
+*/
+TemplateEngine.create = function(def) {
+    return new TemplateEngine({
+        blocks:     Immutable.List(def.blocks || []),
+        extensions: Immutable.Map(def.extensions || {}),
+        filters:    Immutable.Map(def.filters || {}),
+        globals:    Immutable.Map(def.globals || {}),
+        context:    def.context,
+        loader:     def.loader
+    });
+};
+
+module.exports = TemplateEngine;