fix(ast): Bug with String interpolation and values

Author: GeekMasher

ql/lib/codeql/bicep/ast/Literals.qll

@@ -66,16 +66,34 @@ class Number extends Literals instanceof NumberImpl {
   int getValue() { result = NumberImpl.super.getValue().toInt() }
 }
 
+class String = StringLiteral;
+
 /**
  * A String literal in the AST.
  */
 class StringLiteral extends Literals instanceof StringImpl {
+  /**
+   * Gets the value of the string literal.
+   */
   string getValue() {
-    exists(StringContentLiteral content |
-      content = this.getAChild() and
-      result = content.getValue()
+    result = concat(int index, string output |
+      exists(StringContentLiteral content |
+        content = StringImpl.super.getChild(index) and
+        output = content.getValue()
+      )
+      or
+      exists(Interpolation interpolation |
+        interpolation = StringImpl.super.getChild(index) and
+        output = interpolation.getValue()
+      )
+    |
+      output order by index
     )
   }
+
+  Interpolation getInterpolation(int index) {
+    result = StringImpl.super.getChild(index)
+  }
 }
 
 /**

ql/lib/codeql/bicep/ast/internal/Interpolation.qll

@@ -21,4 +21,7 @@ class InterpolationImpl extends TInterpolation, ExprImpl {
 
   override string toString() { result = ast.toString() }
 
+  ExprImpl getExpression() {
+    toTreeSitter(result) = ast.getChild()
+  }
 }

ql/lib/codeql/bicep/ast/internal/String.qll

@@ -3,12 +3,12 @@
  *
  *  WARNING: this file is generated, do not edit manually
  */
+
 private import AstNodes
 private import TreeSitter
 private import codeql.bicep.ast.AstNodes
 private import Literals
 
-
 /**
  *  A String AST Node.
  */
@@ -20,13 +20,15 @@ class StringImpl extends TString, LiteralsImpl {
   StringImpl() { this = TString(ast) }
 
   override string toString() { result = ast.toString() }
+
   /**
    *  Get the literal value
-   * 
+   *
    *  TODO: This is broken.
    */
   override string getValue() { result = ast.getChild(_).toString() }
 
-
-
-}
+  AstNode getChild(int index) {
+    toTreeSitter(result) = ast.getChild(index)
+  }
+}