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--- cookbooks:devel:transformations [2018/11/23 11:54]
miconda
+++ cookbooks:devel:transformations [2019/09/04 20:56]
henningw [{s.unbracket}]
@@ Line 335: / Line 335: @@
 $var(uri) = $(var(x){s.unbracket});
 </code>
+==== {s.count,c} ====
+Count how many times c appears in the pv value.
+<code c>
+abababa"{s.count,a}
+# will return 4
+</code>
 ===== URI Transformations =====
@@ Line 416: / Line 427: @@
 The name of the transformation starts with 'param.'. The PV value is considered to be a string like name1=value1;name2=value2;...". The transformations returns the value for a specific parameter, or the name of a parameter at a specific index.
-Available transformations in this class:
+Available transformations in this class are presented in the next sections.
+**Important Note:** the delimiter cannot be comma (,), because this trasformation is using SIP header/URI parameters parser and the comma is a delimiter between serialized SIP header/URI bodies. The workaround is to use the subst transformation to replace the comma with another character that is used then as separator.
@@ Line 711: / Line 724: @@
 $(hu{url.querystring}) => "this=is&the=querystring"
+</code>
+===== JSON Transformations =====
+<fc #0000ff>This transformation class is exported by **json** module.</fc>
+==== {json.parse} ====
+You can use the transformation to extract values from the json structured pseudo-variables
+<code>
+$var(Custom-Data) = $(rb{json.parse,Custom-Data});
 </code>

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