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var nunjucks = require('nunjucks');
var Immutable = require('immutable');
var Promise = require('../utils/promise');
var TemplateEngine = Immutable.Record({
// List of {TemplateBlock}
blocks: Immutable.List(),
// 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');
};
/**
Return a nunjucks environment from this configuration
@return {Nunjucks.Environment}
*/
TemplateEngine.prototype.toNunjucks = function() {
var that = this;
var loader = this.getLoader();
var blocks = this.getBlocks();
var filters = this.getFilters();
var globals = this.getGlobals();
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, that.bindToContext(filterFn));
});
// Add blocks
blocks.forEach(function(block) {
var extName = block.getExtensionName();
var Ext = block.toNunjucksExt();
env.addExtension(extName, new Ext());
});
// Add globals
globals.forEach(function(globalName, globalValue) {
env.addGlobal(globalName, globalValue);
});
return env;
};
/**
Bind a function to the context
@param {Function} fn
@return {Function}
*/
TemplateEngine.prototype.bindToContext = function(fn) {
return fn.bind(this.getContext());
};
/**
Render a template
@param {String} filePath
@param {String} content
@param {Object} ctx
@return {Promise<String>}
*/
TemplateEngine.prototype.render = function renderTemplate(filePath, content, context) {
context = context || {};
var env = this.toNunjucks();
return Promise.nfcall(
env.renderString.bind(env),
content,
context,
{
path: filePath
}
);
};
module.exports = TemplateEngine;
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