diff --git a/src/highlightjs-line-numbers.js b/src/highlightjs-line-numbers.js
index f68f8f2..a48e928 100644
--- a/src/highlightjs-line-numbers.js
+++ b/src/highlightjs-line-numbers.js
@@ -34,12 +34,18 @@
if (typeof element !== 'object') return;
var parent = element.parentNode;
+ // if have 'firstLineNumber' attribute and it's a positive nubmer
+ // start line numbering from its value.
+ var startFrom = element.getAttribute('firstLineNumber');
+ // if startFrom is 'null' regex test will return 'false'
+ startFrom = (/^\d+$/.test(startFrom)) ? parseInt(startFrom) : 0;
var lines = getCountLines(parent.textContent);
if (lines > 1) {
var l = '';
for (var i = 0; i < lines; i++) {
- l += (i + 1) + '\n';
+ // shifting line number as it was numbered starting from 'startFrom'
+ l += (startFrom + i + 1) + '\n';
}
var linesPanel = document.createElement('code');
@@ -64,4 +70,4 @@
return lines;
}
-}(window));
\ No newline at end of file
+}(window));
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