Provide PHP style output of booleans by specifying option.

Author: antoineveldhoven

src/twig.core.js

@@ -695,6 +695,18 @@ module.exports = function (Twig) {
      */
     Twig.output = function (output) {
         const {autoescape} = this.options;
+        const {phpStyleBooleans} = this.options;
+
+        // Conform Javascript boolean to PHP boolean
+        if (phpStyleBooleans) {
+            output = output.map(str => {
+                if (typeof str === 'boolean') {
+                    str = str ? '1' : '';
+                }
+
+                return str;
+            });
+        }
 
         if (!autoescape) {
             return output.join('');

src/twig.exports.js

@@ -23,6 +23,7 @@ module.exports = function (Twig) {
             // TODO: turn autoscape on in the next major version
             autoescape: (params.autoescape !== null && params.autoescape) || false,
             allowInlineIncludes: params.allowInlineIncludes || false,
+            phpStyleBooleans: params.phpStyleBooleans || false,
             rethrow: params.rethrow || false,
             namespaces: params.namespaces
         };

test/test.core.js

@@ -147,6 +147,11 @@ describe('Twig.js Core ->', function () {
         twig({data: '{{ false }}'}).render().should.equal('false');
     });
 
+    it('should be able to output booleans (PHP style)', function () {
+        twig({phpStyleBooleans: true, data: '{{ false }}'}).render().should.equal('');
+        twig({phpStyleBooleans: true, data: '{{ true }}'}).render().should.equal('1');
+    });
+
     it('should be able to output strings', function () {
         twig({data: '{{ "double" }}'}).render().should.equal('double');
         twig({data: '{{ \'single\' }}'}).render().should.equal('single');