feat(core): expose spel evaluator in spinnaker/core (#4972)

app/scripts/modules/core/src/presentation/forms/components/ExpressionInput.tsx

@@ -1,5 +1,5 @@
 import * as React from 'react';
-import * as spel2js from 'spel2js';
+import { parseSpelExpressions } from '../spel2js.templateParser';
 import { BindAll } from 'lodash-decorators';
 import { truncate } from 'lodash';
 
@@ -66,7 +66,7 @@ export class ExpressionInput extends React.Component<IExpressionInputProps, IExp
     };
 
     try {
-      const exprs = spel2js.TemplateParser.parse(value);
+      const exprs = parseSpelExpressions(value);
       const results = exprs.map(expr => expr.eval(context, locals));
       this.setState({ spelError: null, spelPreview: results.join(''), value });
 

app/scripts/modules/core/src/presentation/forms/index.ts

@@ -1,4 +1,4 @@
 ///<reference path="./spel2js.d.ts" />
 
 export * from './components';
-import './spel2js.templateParser';
+export * from './spel2js.templateParser';

app/scripts/modules/core/src/presentation/forms/spel2js.templateParser.ts

@@ -1,27 +1,25 @@
 import * as spel2js from 'spel2js';
 import { SpelExpression } from 'spel2js';
 
-(spel2js as any).TemplateParser = {
-  parse(template: string): SpelExpression[] {
-    const spelExpressions = new TemplateAwareExpressionParser().parseExpressions(template);
-
-    // A Monkey patch which adds the current context when an exception occurs
-    spelExpressions.forEach(expr => {
-      const getValue = expr._compiledExpression.getValue;
-      expr._compiledExpression.getValue = function() {
-        const state = arguments[0];
-        try {
-          return getValue.apply(expr._compiledExpression, arguments);
-        } catch (err) {
-          err.state = state;
-          throw err;
-        }
+export function parseSpelExpressions(template: string): SpelExpression[] {
+  const spelExpressions = new TemplateAwareExpressionParser().parseExpressions(template);
+
+  // A Monkey patch which adds the current context when an exception occurs
+  spelExpressions.forEach(expr => {
+    const getValue = expr._compiledExpression.getValue;
+    expr._compiledExpression.getValue = function() {
+      const state = arguments[0];
+      try {
+        return getValue.apply(expr._compiledExpression, arguments);
+      } catch (err) {
+        err.state = state;
+        throw err;
       }
-    });
+    }
+  });
 
-    return spelExpressions;
-  }
-};
+  return spelExpressions;
+}
 
 const literalExpression = (literalString: string) =>
   spel2js.SpelExpressionEvaluator.compile(`'${literalString.replace(/'/g, "''")}'`);