Merge pull request #13 from engineerjoe440/master

added iec-61131-3 conversion function support

Author: Serhioromano

iecst.js

@@ -51,6 +51,16 @@ function hljsDefineIECST(hljs) {
                 contains: [hljs.BACKSLASH_ESCAPE, { begin: '""' }],
                 relevance: 0
             },
+            {
+                // Conversion Functions *_TO_**
+                className: "built_in",
+                begin: "(ANY|BOOL|BYTE|D?L?WORD|L?TIME|DATE|DT|TOD|W?CHAR|W?STRING|U?S?D?L?INT|L?REAL)_TO_(BOOL|BYTE|D?L?WORD|L?TIME|DATE|DT|TOD|W?CHAR|W?STRING|U?S?D?L?INT|L?REAL)"
+            },
+            {
+                // Conversion Functions TO_**
+                className: "built_in",
+                begin: "TO_(BOOL|BYTE|D?L?WORD|L?TIME|DATE|DT|TOD|W?CHAR|W?STRING|U?S?D?L?INT|L?REAL)"
+            },
             {
                 className: "symbol",
                 begin: "(D|T|DT|TOD)#[0-9:\\-_shmyd]*"