/// <summary>
/// Get all the argument indices that are expressed in <paramref name="exp"/>.
/// </summary>
/// <param name="exp"></param>
/// <param name="argumentIndices"></param>
static void GetArguments(IExpression exp, ref StructList4 <int> argumentIndices)
{
StructList8 <IExpression> stack = new StructList8 <IExpression>();
stack.Add(exp);
while (stack.Count > 0)
{
IExpression e = stack.Dequeue();
if (e is IArgumentIndexExpression arg)
{
argumentIndices.AddIfNew(arg.Index);
}
if (e is ICompositeExpression compositeExpression)
{
for (int i = 0; i < compositeExpression.ComponentCount; i++)
{
IExpression ce = compositeExpression.GetComponent(i);
if (ce != null)
{
stack.Add(ce);
}
}
}
}
}
/// <summary>
/// Print as string
/// </summary>
/// <param name="str"></param>
/// <returns>string or null</returns>
public LineString Print(IString str)
{
if (str is CSharpFormat && str.Text != null)
{
return(new LineString(null, str.Text, LineStatus.StringFormatOkString));
}
StringBuilder sb = new StringBuilder();
LineStatus status = 0UL;
foreach (var part in str.Parts)
{
// Escape '{' '}' and '\' to '\{' '\}' '\\'
if (part.Kind == StringPartKind.Text)
{
string s = part.Text;
for (int i = 0; i < s.Length; i++)
{
char c = s[i];
if (c == '{' || c == '}' || c == '\\')
{
sb.Append('\\');
}
sb.Append(c);
}
continue;
}
// Placeholder
if (part.Kind == StringPartKind.Placeholder && part is IPlaceholder placeholder)
{
int argumentIx = -1;
string format = null;
int alignment = 0;
StructList8 <IExpression> queue = new StructList8 <IExpression>();
queue.Add(placeholder.Expression);
while (queue.Count > 0)
{
IExpression e = queue.Dequeue();
if (e is IArgumentIndexExpression arg)
{
// Second argument index
if (argumentIx >= 0)
{
status.Up(LineStatus.StringFormatErrorPrintNoCapabilityMultipleArguments);
}
else
{
argumentIx = arg.Index;
}
continue;
}
if (e is ICallExpression call)
{
if (call.Name == "Format" && call.Args != null && call.Args.Length == 2 && call.Args[1] is IConstantExpression formatExp && formatExp.Value is string formatStr)
{
queue.Add(call.Args[0]);
format = formatStr;
}
else if (call.Name == "Alignment" && call.Args != null && call.Args.Length == 2 && call.Args[1] is IConstantExpression alignmentExp)
{
queue.Add(call.Args[0]);
if (alignmentExp.Value is long longValue)
{
alignment = (int)longValue;
}
else if (alignmentExp.Value is int intValue)
{
alignment = intValue;
}
else
{
status.Up(LineStatus.StringFormatErrorPrintUnsupportedExpression);
}
}
else
{
status.Up(LineStatus.StringFormatErrorPrintUnsupportedExpression);
}
continue;
}
status.Up(LineStatus.StringFormatErrorPrintUnsupportedExpression);
}
if (argumentIx >= 0)
{
sb.Append('{');
if (placeholder.PluralCategory != null)
{
sb.Append(placeholder.PluralCategory); sb.Append(':');
}
sb.Append(argumentIx);
if (alignment != 0)
{
sb.Append(','); sb.Append(alignment);
}
if (format != null)
{
sb.Append(":"); sb.Append(format);
}
sb.Append('}');
}
continue;
}
// Malformed
status.Up(LineStatus.StringFormatErrorMalformed);
}
