/// <summary>
/// Gets the given expression as a string value.
/// </summary>
/// <param name="context">The context.</param>
/// <returns>The string value of the expression.</returns>
protected static string GetString(LuaParser.ExpContext context)
{
string text = context.GetText();
if (context.Start.Type == LuaParser.NORMALSTRING &&
context.Stop.Type == LuaParser.NORMALSTRING &&
text.Length > 1)
{
text = text.Substring(1, text.Length - 2);
}
return(text);
}
/// <summary>
/// Gets a name/value pair representing a given Lua table field and whether the value is a nested table or not.
/// </summary>
/// <param name="context">The parse tree node for the field.</param>
/// <param name="valueChild">
/// (optional) The parse tree node for the value, if known; if not known, it is assumed to be the
/// fifth child of the field node.
/// </param>
/// <returns></returns>
protected LuaTableField GetField(LuaParser.FieldContext context, LuaParser.ExpContext valueChild = null)
{
// Fields are expected to have 5 children: <left bracket> <name> <right bracket> <equal> <value>
// When called from the table constructor enter method, the <value> child is not yet populated, so we pass it explicitly.
int expectedChildCount = valueChild == null ? 5 : 4;
// Validate field count
if (context.ChildCount < expectedChildCount)
{
return(null);
}
// Value child not specified, so get it from the fifth child.
if (valueChild == null)
{
valueChild = context.GetChild(4) as LuaParser.ExpContext;
}
// Value isn't an expression? Malformed Lua table.
if (valueChild == null)
{
return(null);
}
// Second child is the <name> node.
var keyChild = context.GetChild(1) as LuaParser.ExpContext;
// Name wasn't an expression? Malformed Lua table.
if (keyChild == null)
{
return(null);
}
// Create key/value instance and return
var field = new LuaTableField
{
Name = GetString(keyChild),
IsTable = valueChild.Start.Type == LuaParser.T__48 // left curly brace token indicates a nested table
};
if (!field.IsTable)
{
field.Value = GetString(valueChild);
}
return(field);
}
public void EnterExp([NotNull] LuaParser.ExpContext context)
{
throw new NotImplementedException();
}
public virtual void ExitExp([NotNull] LuaParser.ExpContext context)
{
}
public virtual Result VisitExp([NotNull] LuaParser.ExpContext context)
{
return(VisitChildren(context));
}
public void EnterExp([NotNull] LuaParser.ExpContext context) => DefaultEnter(context);
public void ExitExp([NotNull] LuaParser.ExpContext context) => DefaultExit(context);