Initial structure for the perform_math_operation function.

js/test_cases/helpers_math/README.md

@@ -2,3 +2,8 @@ Early termination
 -----------------
 
 If the math helper has a body then it stops rendering conditionals after the first conditional that returns true. Rendering an else block does not cause early termination, but else blocks are rendered.
+
+Non-number values
+-----------------
+
+If the math operation involves non-numbers, NaN is returned.

js/test_cases/helpers_math/input1.json

@@ -1,5 +1,7 @@
 {
   "number_7": 7,
   "string_7": "7",
-  "string_cat": "cat"
+  "string_cat": "cat",
+  "add_operation": "add",
+  "a_operation": "a"
 }

js/test_cases/helpers_math/main.dust

@@ -4,6 +4,7 @@ Bodiless math{~n}
 {@math key=number_7 method="add" operand="4" /}{~n}
 {@math key=string_7 method="add" operand="4" /}{~n}
 {@math key=string_cat method="add" operand="4" /}{~n}
+{@math key=string_cat method="add" operand="foo" /}{~n}
 
 Math with body: dot reference{~n}
 ============================={~n}
@@ -44,15 +45,67 @@ Math with body: standalone else block{~n}
 Math with body: early termination{~n}
 ============================={~n}
 {@math key="7" method="add" operand="4"}
-    {@eq value=11}math result is 11{:else}math result is not 11{/eq}{~n}
-    {@eq value=11}math result is 11{:else}math result is not 11{/eq}{~n}
+    {@eq value=11}math result is 11{~n}{:else}math result is not 11{~n}{/eq}
+    {@eq value=11}math result is 11{~n}{:else}math result is not 11{~n}{/eq}
 {/math}
 
 Math with body: early termination else block{~n}
 ============================================{~n}
 {@math key="7" method="add" operand="4"}
-    {@eq value=12}math result is 12{:else}math result is not 12{/eq}{~n}
-    {@eq value=11}math result is 11{:else}math result is not 11{/eq}{~n}
-    {@eq value=12}math result is 12{:else}math result is not 12{/eq}{~n}
+    {@eq value=12}math result is 12{~n}{:else}math result is not 12{~n}{/eq}
+    {@eq value=11}math result is 11{~n}{:else}math result is not 11{~n}{/eq}
+    {@eq value=12}math result is 12{~n}{:else}math result is not 12{~n}{/eq}
 {/math}
 
+
+Math with body: any{~n}
+==================={~n}
+{@math key="7" method="add" operand="4"}
+    {@eq value=10}math result is 10{~n}{:else}math result is not 10{~n}{/eq}
+    {@eq value=11}math result is 11{~n}{:else}math result is not 11{~n}{/eq}
+    {@eq value=12}math result is 12{~n}{:else}math result is not 12{~n}{/eq}
+    {@any}We found the value{~n}{/any}
+    {@none}We did not find the value{~n}{/none}
+{/math}
+
+Math with body: none{~n}
+===================={~n}
+{@math key="7" method="add" operand="4"}
+    {@eq value=10}math result is 10{~n}{:else}math result is not 10{~n}{/eq}
+    {@eq value=12}math result is 12{~n}{:else}math result is not 12{~n}{/eq}
+    {@any}We found the value{~n}{/any}
+    {@none}We did not find the value{~n}{/none}
+{/math}
+
+Math where method is a reference{~n}
+================================{~n}
+{@math key="7" method=add_operation operand="4" /}{~n}
+
+Math where method is a template{~n}
+==============================={~n}
+{@math key="7" method="{a_operation}dd" operand="4" /}{~n}
+
+Math where key is a template{~n}
+============================{~n}
+{@math key="{string_7}1" method="add" operand="4" /}{~n}
+
+Math where method is absent{~n}
+============================{~n}
+{@math key="7" operand="4" /}{~n}
+
+Math where method is missing{~n}
+============================{~n}
+{@math key="7" method=foobar operand="4" /}{~n}
+
+Math with unknown method{~n}
+========================{~n}
+{@math key="7" method="twirl" operand="4" /}{~n}
+
+Math with body where method is absent{~n}
+===================================={~n}
+{@math key="7" operand="4"}
+    {@eq value=12}math result is 12{~n}{:else}math result is not 12{~n}{/eq}
+    {@any}We found the value{~n}{/any}
+    {@none}We did not find the value{~n}{/none}
+    plain text not inside a tag{~n}
+{/math}