private static void Walk([NotNull] Agent agent, [NotNull] BlockStatementNode blockStatement, bool isStrict)
{
//https://tc39.github.io/ecma262/#sec-block-static-semantics-early-errors
var lexicalNames = LexicallyDeclaredNamesWalker.Walk(blockStatement);
if (lexicalNames.Count > 0)
{
var set = new HashSet <string>();
var variableNames = VarDeclaredNamesWalker.Walk(blockStatement);
foreach (var name in lexicalNames)
{
if (!set.Add(name))
{
throw agent.CreateSyntaxError("Duplicate lexical declaration at " + blockStatement.Location);
}
}
foreach (var name in variableNames)
{
if (!set.Add(name))
{
throw agent.CreateSyntaxError("Variable declaration when a lexical declaration already exists at " + blockStatement.Location);
}
}
}
foreach (var node in blockStatement.Body)
{
Walk(agent, node, isStrict);
}
}
public static void Walk([NotNull] Agent agent, [NotNull] ProgramNode program, bool isStrict)
{
//https://tc39.github.io/ecma262/#sec-scripts-static-semantics-early-errors
var lexicalNames = LexicallyDeclaredNamesWalker.Walk(program);
if (ContainsDuplicate(lexicalNames))
{
throw agent.CreateSyntaxError();
}
foreach (var baseNode in program.Body)
{
Walk(agent, baseNode, isStrict);
}
}