private const int Width_Limit = 1000000; // Note: -Width_Limit < ArgAlign < Width_Limit
internal StringBuilder AppendFormatHelper(IFormatProvider provider, String format, ParamsArray args) {
if (format == null) {
throw new ArgumentNullException("format");
}
Contract.Ensures(Contract.Result<StringBuilder>() != null);
Contract.EndContractBlock();
int pos = 0;
int len = format.Length;
char ch = '\x0';
StringBuilder unescapedItemFormat = null;
ICustomFormatter cf = null;
if (provider != null) {
cf = (ICustomFormatter)provider.GetFormat(typeof(ICustomFormatter));
}
while (true) {
while (pos < len) {
ch = format[pos];
pos++;
// Is it a closing brace?
if (ch == '}')
{
// Check next character (if there is one) to see if it is escaped. eg }}
if (pos < len && format[pos] == '}')
pos++;
else
// Otherwise treat it as an error (Mismatched closing brace)
FormatError();
}
// Is it a opening brace?
if (ch == '{')
{
// Check next character (if there is one) to see if it is escaped. eg {{
if (pos < len && format[pos] == '{')
pos++;
else
{
// Otherwise treat it as the opening brace of an Argument Hole.
pos--;
break;
}
}
// If it neither then treat the character as just text.
Append(ch);
}
//
// Start of parsing of Argument Hole.
// Argument Hole ::= { Index (, WS* Alignment WS*)? (: Formatting)? }
//
if (pos == len) break;
//
// Start of parsing required Index parameter.
// Index ::= ('0'-'9')+ WS*
//
pos++;
// If reached end of text then error (Unexpected end of text)
// or character is not a digit then error (Unexpected Character)
if (pos == len || (ch = format[pos]) < '0' || ch > '9') FormatError();
int index = 0;
do {
index = index * 10 + ch - '0';
pos++;
// If reached end of text then error (Unexpected end of text)
if (pos == len) FormatError();
ch = format[pos];
// so long as character is digit and value of the index is less than 1000000 ( index limit )
} while (ch >= '0' && ch <= '9' && index < Index_Limit);
// If value of index is not within the range of the arguments passed in then error (Index out of range)
if (index >= args.Length) throw new FormatException(Environment.GetResourceString("Format_IndexOutOfRange"));
// Consume optional whitespace.
while (pos < len && (ch = format[pos]) == ' ') pos++;
// End of parsing index parameter.
//
// Start of parsing of optional Alignment
// Alignment ::= comma WS* minus? ('0'-'9')+ WS*
//
bool leftJustify = false;
int width = 0;
// Is the character a comma, which indicates the start of alignment parameter.
if (ch == ',') {
pos++;
// Consume Optional whitespace
while (pos < len && format[pos] == ' ') pos++;
// If reached the end of the text then error (Unexpected end of text)
if (pos == len) FormatError();
// Is there a minus sign?
ch = format[pos];
if (ch == '-') {
// Yes, then alignment is left justified.
leftJustify = true;
pos++;
// If reached end of text then error (Unexpected end of text)
if (pos == len) FormatError();
ch = format[pos];
}
// If current character is not a digit then error (Unexpected character)
if (ch < '0' || ch > '9') FormatError();
// Parse alignment digits.
do {
width = width * 10 + ch - '0';
pos++;
// If reached end of text then error. (Unexpected end of text)
if (pos == len) FormatError();
ch = format[pos];
// So long a current character is a digit and the value of width is less than 100000 ( width limit )
} while (ch >= '0' && ch <= '9' && width < Width_Limit);
// end of parsing Argument Alignment
}
// Consume optional whitespace
while (pos < len && (ch = format[pos]) == ' ') pos++;
//
// Start of parsing of optional formatting parameter.
//
Object arg = args[index];
String itemFormat = null;
// Is current character a colon? which indicates start of formatting parameter.
if (ch == ':') {
pos++;
int startPos = pos;
while (true) {
// If reached end of text then error. (Unexpected end of text)
if (pos == len) FormatError();
ch = format[pos];
pos++;
// Is character a opening or closing brace?
if (ch == '}' || ch == '{')
{
if (ch == '{')
{
// Yes, is next character also a opening brace, then treat as escaped. eg {{
if (pos < len && format[pos] == '{')
pos++;
else
// Error Argument Holes can not be nested.
FormatError();
}
else
{
// Yes, is next character also a closing brace, then treat as escaped. eg }}
if (pos < len && format[pos] == '}')
pos++;
else
{
// No, then treat it as the closing brace of an Arg Hole.
pos--;
break;
}
}
// Reaching here means the brace has been escaped
// so we need to build up the format string in segments
if (unescapedItemFormat == null)
{
unescapedItemFormat = new StringBuilder();
}
unescapedItemFormat.Append(format, startPos, pos - startPos - 1);
startPos = pos;
}
}
if (unescapedItemFormat == null || unescapedItemFormat.Length == 0)
{
if (startPos != pos)
{
// There was no brace escaping, extract the item format as a single string
itemFormat = format.Substring(startPos, pos - startPos);
}
}
else
{
unescapedItemFormat.Append(format, startPos, pos - startPos);
itemFormat = unescapedItemFormat.ToString();
unescapedItemFormat.Clear();
}
}
// If current character is not a closing brace then error. (Unexpected Character)
if (ch != '}') FormatError();
// Construct the output for this arg hole.
pos++;
String s = null;
if (cf != null) {
s = cf.Format(itemFormat, arg, provider);
}
if (s == null) {
IFormattable formattableArg = arg as IFormattable;
if (formattableArg != null) {
s = formattableArg.ToString(itemFormat, provider);
} else if (arg != null) {
s = arg.ToString();
}
}
// Append it to the final output of the Format String.
if (s == null) s = String.Empty;
int pad = width - s.Length;
if (!leftJustify && pad > 0) Append(' ', pad);
Append(s);
if (leftJustify && pad > 0) Append(' ', pad);
// Continue to parse other characters.
}
return this;
}
public static string Format(IFormatProvider provider, string format, params /* 0x00000001800D4E50-0x00000001800D4E60 */ object[] args) => default; // 0x00000001808C5630-0x00000001808C5710 private static string FormatHelper(IFormatProvider provider, string format, ParamsArray args) => default; // 0x00000001808C51F0-0x00000001808C52D0
internal StringBuilder AppendFormatHelper(IFormatProvider provider, String format, ParamsArray args) {
if (format == null) {
throw new ArgumentNullException("format");
}
Contract.Ensures(Contract.Result<StringBuilder>() != null);
Contract.EndContractBlock();
int pos = 0;
int len = format.Length;
char ch = '\x0';
ICustomFormatter cf = null;
if (provider != null) {
cf = (ICustomFormatter)provider.GetFormat(typeof(ICustomFormatter));
}
while (true) {
while (pos < len) {
ch = format[pos];
pos++;
if (ch == '}')
{
if (pos < len && format[pos] == '}') // Treat as escape character for }}
pos++;
else
FormatError();
}
if (ch == '{')
{
if (pos < len && format[pos] == '{') // Treat as escape character for {{
pos++;
else
{
pos--;
break;
}
}
Append(ch);
}
if (pos == len) break;
pos++;
if (pos == len || (ch = format[pos]) < '0' || ch > '9') FormatError();
int index = 0;
do {
index = index * 10 + ch - '0';
pos++;
if (pos == len) FormatError();
ch = format[pos];
} while (ch >= '0' && ch <= '9' && index < 1000000);
if (index >= args.Length) throw new FormatException(Environment.GetResourceString("Format_IndexOutOfRange"));
while (pos < len && (ch = format[pos]) == ' ') pos++;
bool leftJustify = false;
int width = 0;
if (ch == ',') {
pos++;
while (pos < len && format[pos] == ' ') pos++;
if (pos == len) FormatError();
ch = format[pos];
if (ch == '-') {
leftJustify = true;
pos++;
if (pos == len) FormatError();
ch = format[pos];
}
if (ch < '0' || ch > '9') FormatError();
do {
width = width * 10 + ch - '0';
pos++;
if (pos == len) FormatError();
ch = format[pos];
} while (ch >= '0' && ch <= '9' && width < 1000000);
}
while (pos < len && (ch = format[pos]) == ' ') pos++;
Object arg = args[index];
StringBuilder fmt = null;
if (ch == ':') {
pos++;
while (true) {
if (pos == len) FormatError();
ch = format[pos];
pos++;
if (ch == '{')
{
if (pos < len && format[pos] == '{') // Treat as escape character for {{
pos++;
else
FormatError();
}
else if (ch == '}')
{
if (pos < len && format[pos] == '}') // Treat as escape character for }}
pos++;
else
{
pos--;
break;
}
}
if (fmt == null) {
fmt = new StringBuilder();
}
fmt.Append(ch);
}
}
if (ch != '}') FormatError();
pos++;
String sFmt = null;
String s = null;
if (cf != null) {
if (fmt != null) {
sFmt = fmt.ToString();
}
s = cf.Format(sFmt, arg, provider);
}
if (s == null) {
IFormattable formattableArg = arg as IFormattable;
if (formattableArg != null) {
if (sFmt == null && fmt != null) {
sFmt = fmt.ToString();
}
s = formattableArg.ToString(sFmt, provider);
} else if (arg != null) {
s = arg.ToString();
}
}
if (s == null) s = String.Empty;
int pad = width - s.Length;
if (!leftJustify && pad > 0) Append(' ', pad);
Append(s);
if (leftJustify && pad > 0) Append(' ', pad);
}
return this;
}
internal StringBuilder AppendFormatHelper(IFormatProvider provider, String format, ParamsArray args)
{
if (format == null)
throw new ArgumentNullException("format");
int pos = 0;
int len = format.Length;
char ch = '\x0';
StringBuilder unescapedItemFormat = null;
ICustomFormatter cf = null;
if (provider != null)
{
cf = (ICustomFormatter)provider.GetFormat(typeof(ICustomFormatter));
}
while (true)
{
while (pos < len)
{
ch = format[pos];
pos++;
if (ch == '}')
{
if (pos < len && format[pos] == '}') // Treat as escape character for }}
pos++;
else
FormatError();
}
if (ch == '{')
{
if (pos < len && format[pos] == '{') // Treat as escape character for {{
pos++;
else
{
pos--;
break;
}
}
Append(ch);
}
if (pos == len) break;
pos++;
if (pos == len || (ch = format[pos]) < '0' || ch > '9') FormatError();
int index = 0;
do
{
index = index * 10 + ch - '0';
pos++;
if (pos == len) FormatError();
ch = format[pos];
} while (ch >= '0' && ch <= '9' && index < 1000000);
if (index >= args.Length) throw new FormatException(SR.Format_IndexOutOfRange);
while (pos < len && (ch = format[pos]) == ' ') pos++;
bool leftJustify = false;
int width = 0;
if (ch == ',')
{
pos++;
while (pos < len && format[pos] == ' ') pos++;
if (pos == len) FormatError();
ch = format[pos];
if (ch == '-')
{
leftJustify = true;
pos++;
if (pos == len) FormatError();
ch = format[pos];
}
if (ch < '0' || ch > '9') FormatError();
do
{
width = width * 10 + ch - '0';
pos++;
if (pos == len) FormatError();
ch = format[pos];
} while (ch >= '0' && ch <= '9' && width < 1000000);
}
while (pos < len && (ch = format[pos]) == ' ') pos++;
Object arg = args[index];
String itemFormat = null;
if (ch == ':')
{
pos++;
int startPos = pos;
while (true)
{
if (pos == len) FormatError();
ch = format[pos];
pos++;
if (ch == '}' || ch == '{')
{
if (ch == '{')
{
if (pos < len && format[pos] == '{') // Treat as escape character for {{
pos++;
else
FormatError();
}
else
{
if (pos < len && format[pos] == '}') // Treat as escape character for }}
pos++;
else
{
pos--;
break;
}
}
// Reaching here means the brace has been escaped
// so we need to build up the format string in segments
if (unescapedItemFormat == null)
{
unescapedItemFormat = new StringBuilder();
}
unescapedItemFormat.Append(format, startPos, pos - startPos - 1);
startPos = pos;
}
}
if (unescapedItemFormat == null || unescapedItemFormat.Length == 0)
{
if (startPos != pos)
{
// There was no brace escaping, extract the item format as a single string
itemFormat = format.Substring(startPos, pos - startPos);
}
}
else
{
unescapedItemFormat.Append(format, startPos, pos - startPos);
itemFormat = unescapedItemFormat.ToString();
unescapedItemFormat.Clear();
}
}
if (ch != '}') FormatError();
pos++;
String s = null;
if (cf != null)
{
s = cf.Format(itemFormat, arg, provider);
}
if (s == null)
{
IFormattable formattableArg = arg as IFormattable;
if (formattableArg != null)
{
s = formattableArg.ToString(itemFormat, provider);
}
else if (arg != null)
{
s = arg.ToString();
}
}
if (s == null) s = String.Empty;
int pad = width - s.Length;
if (!leftJustify && pad > 0) Append(' ', pad);
Append(s);
if (leftJustify && pad > 0) Append(' ', pad);
}
return this;
}
