Fix chained ternary conditionals instrumentation (#830)

lib/parse.js

@@ -91,6 +91,14 @@ parse.Conditional = function(contract, expression, skipStatementRegistry) {
   parse[expression.condition.type] &&
   parse[expression.condition.type](contract, expression.condition, true);
 
+  if (expression.trueExpression && expression.trueExpression.type === 'Conditional'){
+    parse[expression.trueExpression.type](contract, expression.trueExpression, true);
+  }
+
+  if (expression.falseExpression && expression.falseExpression.type === 'Conditional'){
+    parse[expression.falseExpression.type](contract, expression.falseExpression, true);
+  }
+
   register.conditional(contract, expression);
 };
 

test/sources/solidity/contracts/conditional/chained-multiline.sol

@@ -0,0 +1,14 @@
+pragma solidity ^0.7.0;
+
+contract Test {
+    function a() public {
+        int min = 1;
+        int max = 2;
+        int value = 3;
+        value < min
+          ? min
+          : value > max
+            ? max
+            : value;
+    }
+}

test/sources/solidity/contracts/conditional/chained-singleline.sol

@@ -0,0 +1,10 @@
+pragma solidity ^0.7.0;
+
+contract Test {
+    function a() public {
+        int min = 1;
+        int max = 2;
+        int value = 3;
+        value < min ? min : value > max ? max : value;
+    }
+}

test/sources/solidity/contracts/conditional/chained-true.sol

@@ -0,0 +1,14 @@
+pragma solidity ^0.7.0;
+
+contract Test {
+    function a() public {
+        int min = 1;
+        int max = 2;
+        int value = 3;
+        value < min
+          ? value > max
+            ? max
+            : value
+          : min;
+    }
+}

test/sources/solidity/contracts/conditional/chained-with-parens.sol

@@ -0,0 +1,10 @@
+pragma solidity ^0.7.0;
+
+contract Test {
+    function a() public {
+        int min = 1;
+        int max = 2;
+        int value = 3;
+        (value < min) ? min : (value > max) ? max : value;
+    }
+}

test/units/conditional.js

@@ -233,4 +233,24 @@ describe('ternary conditionals', () => {
     const info = util.instrumentAndCompile('conditional/ternary-with-unbracketed-else');
     util.report(info.solcOutput.errors);
   });
+
+  it('should compile after instrumenting a chain of ternary conditionals (single line)', () => {
+    const info = util.instrumentAndCompile('conditional/chained-singleline');
+    util.report(info.solcOutput.errors);
+  });
+
+  it('should compile after instrumenting a chain of ternary conditionals (multi-line)', () => {
+    const info = util.instrumentAndCompile('conditional/chained-multiline');
+    util.report(info.solcOutput.errors);
+  });
+
+  it('should compile after instrumenting a chain of ternary conditionals (parens)', () => {
+    const info = util.instrumentAndCompile('conditional/chained-with-parens');
+    util.report(info.solcOutput.errors);
+  });
+
+  it('should compile after instrumenting a chain of ternary conditionals (true expr is tern)', () => {
+    const info = util.instrumentAndCompile('conditional/chained-true');
+    util.report(info.solcOutput.errors);
+  });
 });