Add support for file-level constants

Author: fvictorio

src/ASTBuilder.js

@@ -939,6 +939,23 @@ const transformAST = {
     }
   },
 
+  FileLevelConstant(ctx) {
+    const type = this.visit(ctx.typeName())
+    const iden = ctx.identifier()
+    const name = toText(iden)
+
+    let expression = null
+    if (ctx.expression()) {
+      expression = this.visit(ctx.expression())
+    }
+
+    return {
+      typeName: type,
+      name,
+      initialValue: expression,
+    }
+  },
+
   ForStatement(ctx) {
     let conditionExpression = this.visit(ctx.expressionStatement())
     if (conditionExpression) {

test/ast.js

@@ -719,6 +719,25 @@ describe('AST', () => {
     })
   })
 
+  it("file-level constants", function() {
+    var ast = parser.parse("uint constant EXPONENT = 10;")
+    var fileLevelConstantNode = ast.children[0];
+
+    assert.deepEqual(fileLevelConstantNode, {
+      type: "FileLevelConstant",
+      initialValue: {
+        number: "10",
+        subdenomination: null,
+        type: "NumberLiteral"
+      },
+      name: "EXPONENT",
+      typeName: {
+        name: "uint",
+        type: "ElementaryTypeName"
+      }
+    })
+  })
+
   it("ModifierInvocation", function() {
     var ast = parseNode("function foo(uint a) onlyOwner {}")
     assert.deepEqual(ast.modifiers[0], {

test/index.js

@@ -20,7 +20,7 @@ describe("#parse", function() {
   it("supports tolerant mode", function() {
     var source = "not good"
     var root = parser.parse(source, { tolerant: true })
-    assert.equal(root.errors.length, 1)
+    assert.isAbove(root.errors.length, 0)
   })
 
   it("supports loc", function() {

test/test.sol

@@ -708,3 +708,6 @@ contract AssemblySlotNotation {
 function helper(uint x) pure returns (uint) {
     return x * 2;
 }
+
+// file-level constant
+uint constant topLevelConstantVariable = 3;