private void EnsureSize(IArrayPool <char> bufferPool, int appendLength) { var newBuffer = BufferUtils.RentBuffer(bufferPool, (Position + appendLength) * 2); if (InternalBuffer != null) { Array.Copy(InternalBuffer, newBuffer, Position); BufferUtils.ReturnBuffer(bufferPool, InternalBuffer); } InternalBuffer = newBuffer; }
public static void WriteEscapedJavaScriptString(TextWriter writer, string s, char delimiter, bool appendDelimiters, bool[] charEscapeFlags, StringEscapeHandling stringEscapeHandling, IArrayPool <char> bufferPool, ref char[] writeBuffer) { // leading delimiter if (appendDelimiters) { writer.Write(delimiter); } if (!string.IsNullOrEmpty(s)) { var lastWritePosition = FirstCharToEscape(s, charEscapeFlags, stringEscapeHandling); if (lastWritePosition == -1) { writer.Write(s); } else { if (lastWritePosition != 0) { if (writeBuffer == null || writeBuffer.Length < lastWritePosition) { writeBuffer = BufferUtils.EnsureBufferSize(bufferPool, lastWritePosition, writeBuffer); } // write unchanged chars at start of text. s.CopyTo(0, writeBuffer, 0, lastWritePosition); writer.Write(writeBuffer, 0, lastWritePosition); } int length; for (var i = lastWritePosition; 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) { if (c == '\'' && stringEscapeHandling != StringEscapeHandling.EscapeHtml) { escapedValue = @"\'"; } else if (c == '"' && stringEscapeHandling != StringEscapeHandling.EscapeHtml) { escapedValue = @"\"""; } else { if (writeBuffer == null || writeBuffer.Length < UnicodeTextLength) { writeBuffer = BufferUtils.EnsureBufferSize(bufferPool, UnicodeTextLength, writeBuffer); } StringUtils.ToCharAsUnicode(c, writeBuffer); // slightly hacky but it saves multiple conditions in if test escapedValue = EscapedUnicodeText; } } else { escapedValue = null; } break; } if (escapedValue == null) { continue; } var isEscapedUnicodeText = string.Equals(escapedValue, EscapedUnicodeText); if (i > lastWritePosition) { length = i - lastWritePosition + (isEscapedUnicodeText ? UnicodeTextLength : 0); var start = isEscapedUnicodeText ? UnicodeTextLength : 0; if (writeBuffer == null || writeBuffer.Length < length) { var newBuffer = BufferUtils.RentBuffer(bufferPool, length); // the unicode text is already in the buffer // copy it over when creating new buffer if (isEscapedUnicodeText) { Array.Copy(writeBuffer, newBuffer, UnicodeTextLength); } BufferUtils.ReturnBuffer(bufferPool, writeBuffer); writeBuffer = newBuffer; } s.CopyTo(lastWritePosition, writeBuffer, start, length - start); // write unchanged chars before writing escaped text writer.Write(writeBuffer, start, length - start); } lastWritePosition = i + 1; if (!isEscapedUnicodeText) { writer.Write(escapedValue); } else { writer.Write(writeBuffer, 0, UnicodeTextLength); } } Debug.Assert(lastWritePosition != 0); length = s.Length - lastWritePosition; if (length > 0) { if (writeBuffer == null || writeBuffer.Length < length) { writeBuffer = BufferUtils.EnsureBufferSize(bufferPool, length, writeBuffer); } s.CopyTo(lastWritePosition, writeBuffer, 0, length); // write remaining text writer.Write(writeBuffer, 0, length); } } } // trailing delimiter if (appendDelimiters) { writer.Write(delimiter); } }