/// <summary>
/// Initializes a new instance of the <see cref="Equal"/> class.
/// </summary>
public Equal()
: base(
ExpressionType.Equal,
(args) => FunctionUtils.CommonEquals(args[0], args[1]),
FunctionUtils.ValidateBinary)
{
}
private static (object value, string error) Evaluator(Expression expression, IMemory state, Options options)
{
var found = false;
var(args, error) = FunctionUtils.EvaluateChildren(expression, state, options);
if (error == null)
{
if (args[0] is string string0 && args[1] is string string1)
{
found = string0.Contains(string1);
}
else if (FunctionUtils.TryParseList(args[0], out IList ilist))
{
// list to find a value
var operands = FunctionUtils.ResolveListValue(ilist);
foreach (var item in operands)
{
if (FunctionUtils.CommonEquals(item, args[1]))
{
found = true;
break;
}
}
}
else if (args[1] is string string2)
{
found = FunctionUtils.TryAccessProperty((object)args[0], string2, out var _);
}
}
/// <inheritdoc/>
public override object VisitSwitchCaseBody([NotNull] LGTemplateParser.SwitchCaseBodyContext context)
{
var switchCaseNodes = context.switchCaseTemplateBody().switchCaseRule();
var length = switchCaseNodes.Length;
var switchExprs = switchCaseNodes[0].switchCaseStat().expression();
var switchErrorPrefix = "Switch '" + switchExprs[0].GetText() + "': ";
var switchExprResult = EvalExpression(switchExprs[0].GetText(), switchExprs[0], switchCaseNodes[0].switchCaseStat().GetText(), switchErrorPrefix);
var idx = 0;
foreach (var switchCaseNode in switchCaseNodes)
{
if (idx == 0)
{
idx++;
continue; // skip the first node, which is switch statement
}
if (idx == length - 1 && switchCaseNode.switchCaseStat().DEFAULT() != null)
{
var defaultBody = switchCaseNode.normalTemplateBody();
if (defaultBody != null)
{
return(Visit(defaultBody));
}
else
{
return(null);
}
}
var caseExprs = switchCaseNode.switchCaseStat().expression();
var caseErrorPrefix = "Case '" + caseExprs[0].GetText() + "': ";
var caseExprResult = EvalExpression(caseExprs[0].GetText(), caseExprs[0], switchCaseNode.switchCaseStat().GetText(), caseErrorPrefix);
if (FunctionUtils.CommonEquals(switchExprResult, caseExprResult))
{
return(Visit(switchCaseNode.normalTemplateBody()));
}
idx++;
}
return(null);
}