add API blueprint verification

Author: Vladimir Kotal

dev/before_install

@@ -2,15 +2,18 @@
 
 if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
 	sudo apt-get update -qq
-	sudo apt-get install -qq cvs git mercurial cssc bzr subversion monotone rcs rcs-blame python3 python3-pip pep8;
+	sudo apt-get install -qq cvs git mercurial cssc bzr subversion monotone rcs rcs-blame python3 python3-pip pep8 nodejs;
 	sudo ./dev/install-bitkeeper.sh
 	sudo pip3 install --upgrade pip
 	sudo pip3 install flake8
 elif [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
 	brew update
-	brew install ctags cvs
+	brew install ctags cvs node
 	brew upgrade python
 	pip3 install pep8 flake8
 fi
 
 sudo ./dev/install-universal_ctags.sh
+
+# for API blueprint verification
+npm install drafter

dev/parse.js

@@ -0,0 +1,39 @@
+var drafter = require('drafter');
+var fs = require('fs');
+
+new Promise(function(resolve, reject) {
+        fs.readFile('apiary.apib', 'utf8', (error, data) => {
+            if (error) {
+                console.error(error);
+                reject(1);
+            }
+
+            resolve(data);
+        });
+    })
+    .then(function(data) {
+        return new Promise((resolve, reject) => {
+            drafter.parse(data, function(error, result) {
+                if (error) {
+                    console.log(error);
+                    resolve(1);
+                    return;
+                } else {
+                    for (x in result.content) {
+                        var d = result.content[x];
+                        // console.log(d);
+                        if (d['element'] != 'category') {
+                            console.log('Error:\n', d);
+                            resolve(1);
+                            return;
+                        }
+                    }
+                }
+
+                console.log("Blueprint check passed");
+                resolve(0);
+            });
+        });
+    })
+    .then(process.exit)
+    .catch(process.exit);