public static void WriteEscapedJavaScriptString (TextWriter writer, string s, char delimiter, QuoteNameHandling appendDelimitersHandling, bool[] charEscapeFlags, StringEscapeHandling stringEscapeHandling)
{
// leading delimiter
bool appendDelimiters = appendDelimitersHandling == QuoteNameHandling.Quoted
|| appendDelimitersHandling == QuoteNameHandling.Auto && !IsValidIdentifier(s);
if (appendDelimiters)
writer.Write(delimiter);
if (s != null) {
char[] chars = null;
char[] unicodeBuffer = null;
int lastWritePosition = 0;
for (int i = 0; i < s.Length; i++) {
var c = s[i];
if (c < charEscapeFlags.Length && !charEscapeFlags[c])
continue;
string escapedValue;
switch (c) {
case '\t':
escapedValue = "\\t";
break;
case '\n':
escapedValue = "\\n";
break;
case '\r':
escapedValue = "\\r";
break;
case '\f':
escapedValue = "\\f";
break;
case '\b':
escapedValue = "\\b";
break;
case '\\':
escapedValue = "\\\\";
break;
case '\u0085': // Next Line
escapedValue = "\\u0085";
break;
case '\u2028': // Line Separator
escapedValue = "\\u2028";
break;
case '\u2029': // Paragraph Separator
escapedValue = "\\u2029";
break;
default:
if (c >= charEscapeFlags.Length && stringEscapeHandling != StringEscapeHandling.EscapeNonAscii)
escapedValue = null;
else if (c == '\'' && stringEscapeHandling != StringEscapeHandling.EscapeHtml)
escapedValue = "\\'";
else if (c == '"' && stringEscapeHandling != StringEscapeHandling.EscapeHtml)
escapedValue = "\\\"";
else {
if (unicodeBuffer == null)
unicodeBuffer = new char[6];
StringUtils.ToCharAsUnicode(c, unicodeBuffer);
// slightly hacky but it saves multiple conditions in if test
escapedValue = EscapedUnicodeText;
}
break;
}
if (escapedValue == null)
continue;
if (i > lastWritePosition) {
if (chars == null)
chars = s.ToCharArray();
// write unchanged chars before writing escaped text
writer.Write(chars, lastWritePosition, i - lastWritePosition);
}
lastWritePosition = i + 1;
if (string.Equals(escapedValue, EscapedUnicodeText))
writer.Write(unicodeBuffer);
else
writer.Write(escapedValue);
}
if (lastWritePosition == 0) // no escaped text, write entire string
writer.Write(s);
else {
if (chars == null)
chars = s.ToCharArray();
// write remaining text
writer.Write(chars, lastWritePosition, s.Length - lastWritePosition);
}
}
// trailing delimiter
if (appendDelimiters)
writer.Write(delimiter);
}
public static void WriteEscapedJavaScriptString(TextWriter writer, string s, char delimiter, QuoteNameHandling appendDelimitersHandling, bool[] charEscapeFlags, StringEscapeHandling stringEscapeHandling)
{
// leading delimiter
bool appendDelimiters = appendDelimitersHandling == QuoteNameHandling.Quoted ||
appendDelimitersHandling == QuoteNameHandling.Auto && !IsValidIdentifier(s);
if (appendDelimiters)
{
writer.Write(delimiter);
}
if (s != null)
{
char[] chars = null;
char[] unicodeBuffer = null;
int lastWritePosition = 0;
for (int i = 0; i < s.Length; i++)
{
var c = s[i];
if (c < charEscapeFlags.Length && !charEscapeFlags[c])
{
continue;
}
string escapedValue;
switch (c)
{
case '\t':
escapedValue = "\\t";
break;
case '\n':
escapedValue = "\\n";
break;
case '\r':
escapedValue = "\\r";
break;
case '\f':
escapedValue = "\\f";
break;
case '\b':
escapedValue = "\\b";
break;
case '\\':
escapedValue = "\\\\";
break;
case '\u0085': // Next Line
escapedValue = "\\u0085";
break;
case '\u2028': // Line Separator
escapedValue = "\\u2028";
break;
case '\u2029': // Paragraph Separator
escapedValue = "\\u2029";
break;
default:
if (c >= charEscapeFlags.Length && stringEscapeHandling != StringEscapeHandling.EscapeNonAscii)
{
escapedValue = null;
}
else if (c == '\'' && stringEscapeHandling != StringEscapeHandling.EscapeHtml)
{
escapedValue = "\\'";
}
else if (c == '"' && stringEscapeHandling != StringEscapeHandling.EscapeHtml)
{
escapedValue = "\\\"";
}
else
{
if (unicodeBuffer == null)
{
unicodeBuffer = new char[6];
}
StringUtils.ToCharAsUnicode(c, unicodeBuffer);
// slightly hacky but it saves multiple conditions in if test
escapedValue = EscapedUnicodeText;
}
break;
}
if (escapedValue == null)
{
continue;
}
if (i > lastWritePosition)
{
if (chars == null)
{
chars = s.ToCharArray();
}
// write unchanged chars before writing escaped text
writer.Write(chars, lastWritePosition, i - lastWritePosition);
}
lastWritePosition = i + 1;
if (string.Equals(escapedValue, EscapedUnicodeText))
{
writer.Write(unicodeBuffer);
}
else
{
writer.Write(escapedValue);
}
}
if (lastWritePosition == 0) // no escaped text, write entire string
{
writer.Write(s);
}
else
{
if (chars == null)
{
chars = s.ToCharArray();
}
// write remaining text
writer.Write(chars, lastWritePosition, s.Length - lastWritePosition);
}
}
// trailing delimiter
if (appendDelimiters)
{
writer.Write(delimiter);
}
}
