improve handling of quotes in keys in the sanitize() function

implements the tests defined in 6cf3754
fixes #6

lib/caml.js

@@ -86,26 +86,40 @@ function replaceVariables(yamlLines) {
 function sanitize(yamlString) {
   return yamlString.split('\n')
     .map(function (line) {
-      var enclosedDottedMatch = line.trim().match(/["'].*\..*["']:\s/);
-      var rawDottedMatch = line.trim().match(/.*\..*:\s/);
-
-      if (enclosedDottedMatch) {
-        var enclosedSubstituted = line.replace(enclosedDottedMatch[0],
-          enclosedDottedMatch[0]
-            .replace(/["']/g, '')          // Strip " or ' from the keys
-            .replace(/\./g, DOT_SUBSTITUTE) // Replace . by DOT_SUBSTITUTE in "" keys
-        );
-
-        return enclosedSubstituted;
-      } else if (rawDottedMatch) {
-        var rawSubstituted = line.replace(rawDottedMatch[0],
-          rawDottedMatch[0]
-            .replace(/\./g, DOT_SUBSTITUTE + DOT_SUBSTITUTE) // Replace . by DOT_SUBSTITUTE + DOT_SUBSTITUTE in raw dotted keys
-        );
-        return rawSubstituted;
-      } else {
+      var colonIdx = line.indexOf(':');
+
+      // not an object -> no escaping needed
+      if (colonIdx === -1) {
         return line;
       }
+
+      var key = line.slice(0, colonIdx);
+      var value = line.slice(colonIdx + 1);
+
+      while (quoteMatch = key.match(/["']/)) {
+        var quote = quoteMatch[0];
+        var startIdx = quoteMatch.index;
+
+        var endIdx = key.indexOf(quote, startIdx + 1);
+
+        if (endIdx === -1) {
+          throw new Error('Key contains incomplete quoted section: "' + line + '"');
+        }
+
+        var quoted = key.slice(startIdx + 1, endIdx);
+
+        if (quoted.match(/['"]/)) {
+          throw new Error('Key cannot contain nested quotes: "' + line + '"');
+        }
+
+        key = key.slice(0, startIdx)
+          + quoted.replace(/\./g, DOT_SUBSTITUTE)
+          + key.slice(endIdx + 1);
+      }
+
+      key = key.replace(/\./g, DOT_SUBSTITUTE + DOT_SUBSTITUTE);
+
+      return key + ':' + value;
     })
     .join('\n');
 }