public static string EncodeComment(string str, int index, int endIndex) {
// NOTE: Assumes that the comment is syntactically valid
#if DEBUG
if (str == null) {
throw new ArgumentNullException("str");
}
if (index < 0) {
throw new ArgumentException("index (" + index + ") is less than " +
"0");
}
if (index > str.Length) {
throw new ArgumentException("index (" + index + ") is more than " +
str.Length);
}
if (endIndex < 0) {
throw new ArgumentException("endIndex (" + endIndex +
") is less than " + "0");
}
if (endIndex > str.Length) {
throw new ArgumentException("endIndex (" + endIndex +
") is more than " + str.Length);
}
#endif
int length = endIndex - index;
if (length < 2 || str[index] != '(' || str[endIndex - 1] != ')') {
return str.Substring(index, length);
}
EncodedWordEncoder encoder;
int nextComment = str.IndexOf('(', index + 1);
int nextBackslash = str.IndexOf('\\', index + 1);
// don't count comments or backslashes beyond
// the desired portion
if (nextComment >= endIndex) {
nextComment = -1;
}
if (nextBackslash >= endIndex) {
nextBackslash = -1;
}
bool haveEscape = nextBackslash >= 0;
if (!haveEscape) {
// Check for possible folding whitespace
nextBackslash = str.IndexOf('\n', index + 1);
if (nextBackslash >= endIndex) {
nextBackslash = -1;
}
haveEscape = nextBackslash >= 0;
}
if (nextComment < 0 && nextBackslash < 0) {
// No escapes or nested comments, so it's relatively easy
if (length == 2) {
return "()";
}
encoder = new EncodedWordEncoder();
encoder.AddPrefix("(");
encoder.AddString(str, index + 1, length - 2);
encoder.FinalizeEncoding(")");
return encoder.ToString();
}
if (nextBackslash < 0) {
// No escapes; just look for '(' and ')'
encoder = new EncodedWordEncoder();
while (true) {
int parenStart = index;
// Get the next run of parentheses
while (index < endIndex) {
if (str[index] == '(' || str[index] == ')') {
++index;
} else {
break;
}
}
// Get the next run of non-parentheses
int parenEnd = index;
while (index < endIndex) {
if (str[index] == '(' || str[index] == ')') {
break;
}
++index;
}
if (parenEnd == index) {
encoder.FinalizeEncoding(
str.Substring(
parenStart,
parenEnd - parenStart));
break;
}
encoder.AddPrefix(str.Substring(parenStart, parenEnd - parenStart));
encoder.AddString(str, parenEnd, index - parenEnd);
}
return encoder.ToString();
}
var builder = new StringBuilder();
// escapes, but no nested comments
if (nextComment < 0) {
// skip the first parenthesis
++index;
while (index < endIndex) {
if (str[index] == ')') {
// End of the comment
break;
}
if (str[index] == '\r' && index + 2 < endIndex &&
str[index + 1] == '\n' && (str[index + 2] == 0x20 || str[index + 2] ==
0x09)) {
// Folding whitespace
builder.Append(str[index + 2]);
index += 3;
} else if (str[index] == '\\' && index + 1 < endIndex) {
// Quoted pair
int cp = DataUtilities.CodePointAt(str, index + 1);
if (cp <= 0xffff) {
{
builder.Append((char)cp);
}
} else if (cp <= 0x10ffff) {
builder.Append((char)((((cp - 0x10000) >> 10) & 0x3ff) + 0xd800));
builder.Append((char)(((cp - 0x10000) & 0x3ff) + 0xdc00));
}
index += 1 + (cp >= 0x10000 ? 2 : 1);
} else {
// Other comment text
builder.Append(str[index]);
++index;
}
}
if (builder.Length == 0) {
return "()";
}
encoder = new EncodedWordEncoder();
encoder.AddPrefix("(");
encoder.AddString(builder.ToString());
encoder.FinalizeEncoding(")");
return encoder.ToString();
}
// escapes and nested comments
encoder = new EncodedWordEncoder();
while (true) {
int parenStart = index;
// Get the next run of parentheses
while (index < endIndex) {
if (str[index] == '(' || str[index] == ')') {
++index;
} else {
break;
}
}
// Get the next run of non-parentheses
int parenEnd = index;
builder.Remove(0, builder.Length);
while (index < endIndex) {
if (str[index] == '(' || str[index] == ')') {
break;
}
if (str[index] == '\r' && index + 2 < endIndex &&
str[index + 1] == '\n' && (str[index + 2] == 0x20 || str[index + 2] ==
0x09)) {
// Folding whitespace
builder.Append(str[index + 2]);
index += 3;
} else if (str[index] == '\\' && index + 1 < endIndex) {
// Quoted pair
int cp = DataUtilities.CodePointAt(str, index + 1);
if (cp <= 0xffff) {
builder.Append((char)cp);
} else if (cp <= 0x10ffff) {
builder.Append((char)((((cp - 0x10000) >> 10) & 0x3ff) + 0xd800));
builder.Append((char)(((cp - 0x10000) & 0x3ff) + 0xdc00));
}
index += 1 + (cp >= 0x10000 ? 2 : 1);
} else {
// Other comment text
builder.Append(str[index]);
++index;
}
}
if (builder.Length == 0) {
encoder.FinalizeEncoding(
str.Substring(
parenStart,
parenEnd - parenStart));
break;
}
encoder.AddPrefix(str.Substring(parenStart, parenEnd - parenStart));
encoder.AddString(builder.ToString());
}
return encoder.ToString();
}
private static void EncodePhraseTextInternal(
string str,
int index,
int endIndex,
IList<int[]> tokens,
StringBuilder builder) {
// Assumes the value matches the production "phrase"
// and that there are no comments in the value
if (index == endIndex) {
return; // Empty, so nothing to do
}
int index2 = HeaderParser.ParseCFWS(str, index, endIndex, null);
if (index2 == endIndex) {
// Just linear whitespace
builder.Append(str.Substring(index, endIndex - index));
return;
}
if (!PrecededByStartOrLinearWhitespace(str, index2)) {
// Append a space before the encoded words
builder.Append(' ');
} else {
// Append the linear whitespace
builder.Append(str.Substring(index, index2 - index));
}
var encoder = new EncodedWordEncoder();
var builderPhrase = new StringBuilder();
index = index2;
while (index < endIndex) {
if (str[index] == '"') {
// Quoted string
index = MediaType.skipQuotedString(
str,
index,
endIndex,
builderPhrase);
} else {
// Atom
index2 = HeaderParser.ParsePhraseAtomOrDot(
str,
index,
endIndex,
null);
builderPhrase.Append(str.Substring(index, index2 - index));
index = index2;
}
index2 = HeaderParser.ParseFWS(str, index, endIndex, null);
if (index2 == endIndex) {
encoder.AddString(builderPhrase.ToString());
encoder.FinalizeEncoding();
builder.Append(encoder.ToString());
if (index2 != index) {
builder.Append(str.Substring(index, index2 - index));
} else if (!FollowedByEndOrLinearWhitespace(
str,
endIndex,
str.Length)) {
// Add a space if no linear whitespace follows
builder.Append(' ');
}
break;
}
if (index2 != index) {
builderPhrase.Append(' ');
}
index = index2;
}
}
private string SynthesizeField(string name) {
string fullField = Implode(this.GetMultipleHeaders(name), ", ");
string value = new EncodedWordEncoder().AddString(fullField)
.FinalizeEncoding().ToString();
if (value.Length > 0) {
value += " <me@" + name + "address.invalid>";
} else {
value = "me@" + name + "-address.invalid";
}
return value;
}