Adds hasTokens method to SubstitutionTokens

lib/cartodb/utils/substitution-tokens.js

@@ -6,6 +6,16 @@ var SUBSTITUTION_TOKENS = {
 };
 
 var SubstitutionTokens = {
+    tokens: function(sql) {
+        return Object.keys(SUBSTITUTION_TOKENS).filter(function(tokenName) {
+            return !!sql.match(SUBSTITUTION_TOKENS[tokenName]);
+        });
+    },
+
+    hasTokens: function(sql) {
+        return this.tokens(sql).length > 0;
+    },
+
     replace: function(sql, replaceValues) {
         Object.keys(replaceValues).forEach(function(token) {
             if (SUBSTITUTION_TOKENS[token]) {

test/unit/cartodb/substitution-tokens.test.js

@@ -0,0 +1,40 @@
+var assert = require('assert');
+var SubstitutionTokens = require('../../../lib/cartodb/utils/substitution-tokens');
+
+describe('SubstitutionTokens', function() {
+
+    var sql = [
+        'WITH hgrid AS (',
+        '  SELECT CDB_HexagonGrid(',
+        '    ST_Expand(!bbox!, greatest(!pixel_width!,!pixel_height!) * 100),',
+        '    greatest(!pixel_width!,!pixel_height!) * 100',
+        '  ) as cell',
+        ')',
+        'SELECT',
+        '  hgrid.cell as the_geom_webmercator,',
+        '  count(1) as points_count,',
+        '  count(1)/power(100 * CDB_XYZ_Resolution(CDB_ZoomFromScale(!scale_denominator!)), 2) as points_density,',
+        '  1 as cartodb_id',
+        'FROM hgrid, (select * from table) i',
+        'where ST_Intersects(i.the_geom_webmercator, hgrid.cell)',
+        'GROUP BY hgrid.cell'
+    ].join('\n');
+
+    it('should return tokens present in sql', function() {
+        assert.deepEqual(SubstitutionTokens.tokens(sql), ['bbox', 'scale_denominator', 'pixel_width', 'pixel_height']);
+    });
+
+    it('should return just one token', function() {
+        assert.deepEqual(SubstitutionTokens.tokens('select !bbox! from wadus'), ['bbox']);
+    });
+
+    it('should not return other tokens', function() {
+        assert.deepEqual(SubstitutionTokens.tokens('select !wadus! from wadus'), []);
+    });
+
+    it('should report sql has tokens', function() {
+        assert.equal(SubstitutionTokens.hasTokens(sql), true);
+        assert.equal(SubstitutionTokens.hasTokens('select !bbox! from wadus'), true);
+        assert.equal(SubstitutionTokens.hasTokens('select !wadus! from wadus'), false);
+    });
+});