Moved parse tree classes out of grammar.js started working on compilation. Broke the build

app/imports/parser/parseTree.js

@@ -0,0 +1,96 @@
+// All the classes that make up a parse tree
+
+class ParseNode {
+  // Compiling a node must return a ConstantNode
+  compile(){
+    throw new Meteor.Error('Compile not implemented on ' + this);
+  }
+  compileToSingleValue(){
+    return this.compile();
+  }
+}
+
+function sum(total, num) {
+  return total + num;
+}
+
+class ConstantNode extends ParseNode {
+  constructor({value, type, errors}){
+    // string, number, boolean, numberArray, uncompiledNode
+    this.type = type;
+    this.value = value;
+    if (errors) this.errors = errors;
+  }
+  compile(){
+    return this;
+  }
+  compileToSingleValue(){
+    if (this.type !== 'numberArray') return this;
+    return this.value.reduce(sum, 0);
+  }
+}
+
+class SymbolNode extends ParseNode {
+  constructor({name}){
+    this.name = name;
+  }
+  compile(scope){
+    let value = scope[this.name];
+    let type = typeof value;
+    if (type === 'string' || type === 'number' || type === 'boolean'){
+      return new ConstantNode({value, type});
+    } else if (type === 'undefined'){
+      return new ConstantNode({
+        value: this.name,
+        type: 'uncompiledNode',
+        errors: [`${this.name} could not be resolved`]
+      });
+    } else {
+      throw new Meteor.Error(`Unexpected case: ${this.name} resolved to ${value}`);
+    }
+  }
+}
+
+class ifNode extends ParseNode {
+  constructor({condition, consequent, alternative}){
+    this.condition = condition;
+    this.consequent = consequent;
+    this.alternative = alternative;
+  }
+  compile(){
+    let condition = this.condition.compile();
+    let consequent = this.consequent.compile();
+    let alternative = this.alternative.compile();
+    if (
+      condition.type === 'uncompiledNode' ||
+      consequent.type === 'uncompiledNode' ||
+      alternative.type === 'uncompiledNode'
+    ){
+      // Handle uncompiled child nodes
+      return new ConstantNode({
+        value: `if (${condition.value}) ${consequent.value} else ${alternative.value}`,
+        type: 'uncompiledNode',
+        errors: [
+          ...condition.errors,
+          ...consequent.errors,
+          ...alternative.errors,
+        ],
+      });
+    } else {
+      if (condition.value){
+        return consequent;
+      } else {
+        return alternative;
+      }
+    }
+  }
+}
+
+class OperatorNode extends ParseNode {
+  constructor({left, right, operator, fn}) {
+    this.left = left;
+    this.right = right;
+    this.fn = fn;
+    this.operator = operator;
+  }
+}