private void HandleEscapeSequence(MutableStringBuilder output)
{
Ensure(1);
switch (ReadUTF8Character())
{
case 'b':
output.Append('\b');
break;
case 'f':
output.Append('\f');
break;
case 'n':
output.Append('\n');
break;
case 'r':
output.Append('\r');
break;
case 't':
output.Append('\t');
break;
case 'u':
Ensure(4);
char codePoint = ReadUnicodeCodepoint();
if (Char.IsHighSurrogate(codePoint))
{
HandleLowSurrogate(codePoint, output);
}
else if (Char.IsLowSurrogate(codePoint))
{
// low surrogate with no high surrogate
ThrowExceptionForInvalidUTF8();
}
else
{
WriteUTF8Character((int)codePoint, output);
}
break;
default:
// '\\', '"', '/'...
StartQuoteSequence();
break;
}
}
private void DetectEndOfQuoteSquence(int position, MutableStringBuilder output)
{
if (_quoteStart != -1) {
output.Append(_source, _quoteStart, position - _quoteStart);
_quoteStart = -1;
}
}
private void DetectEndOfQuoteSquence(int position, MutableStringBuilder output)
{
if (_quoteStart != -1)
{
output.Append(_source, _quoteStart, position - _quoteStart);
_quoteStart = -1;
}
}
private void WriteUTF8Character(int chr, MutableStringBuilder output)
{
byte[] utf16Bytes = Encoding.Convert(Encoding.UTF32, Encoding.UTF8, BitConverter.GetBytes(chr));
for (int b = 0; b < utf16Bytes.Length; b++)
{
output.Append(utf16Bytes[b]);
}
}
private void HandleEscapeSequence(MutableStringBuilder output)
{
Ensure(1);
switch (ReadUTF8Character()) {
case 'b':
output.Append('\b');
break;
case 'f':
output.Append('\f');
break;
case 'n':
output.Append('\n');
break;
case 'r':
output.Append('\r');
break;
case 't':
output.Append('\t');
break;
case 'u':
Ensure(4);
char codePoint = ReadUnicodeCodepoint();
if (Char.IsHighSurrogate(codePoint)) {
HandleLowSurrogate(codePoint, output);
}
else if (Char.IsLowSurrogate(codePoint)) {
// low surrogate with no high surrogate
ThrowExceptionForInvalidUTF8();
}
else {
WriteUTF8Character((int)codePoint, output);
}
break;
default:
// '\\', '"', '/'...
StartQuoteSequence();
break;
}
}
private void AppendByte(MutableStringBuilder/*!*/ content, byte b, StringType stringType) {
if (b == 0 && (stringType & StringType.Symbol) != 0) {
ReportError(Errors.NullCharacterInSymbol);
} else {
content.Append(b);
}
}
private void AppendCharacter(MutableStringBuilder/*!*/ content, int c, StringType stringType) {
if (c == 0 && (stringType & StringType.Symbol) != 0) {
ReportError(Errors.NullCharacterInSymbol);
} else {
content.Append((char)c);
}
}
// returns last character read
private int ReadStringContent(MutableStringBuilder/*!*/ content, StringType stringType, int terminator, int openingParenthesis,
ref int nestingLevel) {
while (true) {
int eolnWidth;
int c = ReadNormalizeEndOfLine(out eolnWidth);
if (c == -1) {
return -1;
}
if (openingParenthesis != 0 && c == openingParenthesis) {
nestingLevel++;
} else if (c == terminator) {
if (nestingLevel == 0) {
SeekRelative(-eolnWidth);
return c;
}
nestingLevel--;
} else if (((stringType & StringType.ExpandsEmbedded) != 0) && c == '#' && _bufferPos < _lineLength) {
int c2 = _lineBuffer[_bufferPos];
if (c2 == '$' || c2 == '@' || c2 == '{') {
SeekRelative(-eolnWidth);
return c;
}
} else if ((stringType & StringType.Words) != 0 && IsWhiteSpace(c)) {
SeekRelative(-eolnWidth);
return c;
} else if (c == '\\') {
c = ReadNormalizeEndOfLine(out eolnWidth);
if (c == '\n') {
if ((stringType & StringType.Words) == 0) {
if ((stringType & StringType.ExpandsEmbedded) != 0) {
continue;
}
content.Append('\\');
}
} else if (c == '\\') {
if ((stringType & StringType.RegularExpression) != 0) {
content.Append('\\');
}
} else if ((stringType & StringType.RegularExpression) != 0) {
// \uFFFF, \u{codepoint}
if (c == 'u' && _compatibility >= RubyCompatibility.Ruby19) {
content.Append('\\');
AppendEscapedUnicode(content);
} else {
SeekRelative(-eolnWidth);
AppendEscapedRegexEscape(content, terminator);
}
continue;
} else if ((stringType & StringType.ExpandsEmbedded) != 0) {
if (c == 'u' && _compatibility >= RubyCompatibility.Ruby19) {
// TODO: if the string contains ascii characters only => it is ok and the encoding of the string will be UTF8
if (_encoding != RubyEncoding.UTF8) {
ReportError(Errors.EncodingsMixed, RubyEncoding.UTF8.Name, _encoding.Name);
content.Append('\\');
content.Append('u');
continue;
}
// \uFFFF, \u{codepoint}
if (Peek() == '{') {
AppendUnicodeCodePoint(content, stringType);
continue;
} else {
c = ReadUnicodeEscape();
}
} else {
// other escapes:
SeekRelative(-eolnWidth);
c = ReadEscape();
Debug.Assert(c <= 0xff);
AppendByte(content, (byte)c, stringType);
continue;
}
} else if ((stringType & StringType.Words) != 0 && IsWhiteSpace(c)) {
/* ignore backslashed spaces in %w */
} else if (c != terminator && !(openingParenthesis != 0 && c == openingParenthesis)) {
content.Append('\\');
}
}
AppendCharacter(content, c, stringType);
}
}
// Reads up to 6 hex characters, treats them as a exadecimal code-point value and appends the result to the buffer.
private void AppendUnicodeCodePoint(MutableStringBuilder/*!*/ content, StringType stringType) {
int codepoint = ReadUnicodeCodePoint();
if (codepoint < 0x10000) {
// code-points [0xd800 .. 0xdffff] are not treated as invalid
AppendCharacter(content, codepoint, stringType);
} else {
codepoint -= 0x10000;
content.Append((char)((codepoint / 0x400) + 0xd800), (char)((codepoint % 0x400) + 0xdc00));
}
}
private void AppendEscapedUnicode(MutableStringBuilder/*!*/ content) {
int start = _bufferPos - 1;
if (Peek() == '{') {
ReadUnicodeCodePoint();
} else {
ReadUnicodeEscape();
}
Debug.Assert(_lineBuffer[start] == 'u');
content.Append(_lineBuffer, start, _bufferPos - start);
}
private void AppendEscapedHexEscape(MutableStringBuilder/*!*/ content) {
int start = _bufferPos - 1;
ReadHexEscape();
Debug.Assert(_lineBuffer[start] == 'x');
content.Append(_lineBuffer, start, _bufferPos - start);
}
private void AppendRegularExpressionCompositeEscape(MutableStringBuilder/*!*/ content, int term) {
int c = ReadNormalizeEndOfLine();
if (c == '\\') {
AppendEscapedRegexEscape(content, term);
} else if (c == -1) {
InvalidEscapeCharacter();
} else {
content.Append((char)c);
}
}
// Appends escaped regex escape sequence.
private void AppendEscapedRegexEscape(MutableStringBuilder/*!*/ content, int term) {
int c = Read();
switch (c) {
case 'x':
content.Append('\\');
AppendEscapedHexEscape(content);
break;
case 'M':
if (!Read('-')) {
InvalidEscapeCharacter();
break;
}
content.Append('\\', 'M', '-');
// escaped:
AppendRegularExpressionCompositeEscape(content, term);
break;
case 'C':
if (!Read('-')) {
InvalidEscapeCharacter();
break;
}
content.Append('\\', 'C', '-');
AppendRegularExpressionCompositeEscape(content, term);
break;
case 'c':
content.Append('\\', 'c');
AppendRegularExpressionCompositeEscape(content, term);
break;
case -1:
InvalidEscapeCharacter();
break;
default:
if (IsOctalDigit(c)) {
content.Append('\\');
AppendEscapedOctalEscape(content);
break;
}
if (c != '\\' || c != term) {
content.Append('\\');
}
// ReadEscape is not called if the backslash is followed by an eoln:
Debug.Assert(c != '\n' && (c != '\r' || Peek() != '\n'));
content.Append((char)c);
break;
}
}
private void WriteUTF8Character(int chr, MutableStringBuilder output)
{
byte[] utf16Bytes = Encoding.Convert(Encoding.UTF32, Encoding.UTF8, BitConverter.GetBytes(chr));
for (int b = 0; b < utf16Bytes.Length; b++) {
output.Append(utf16Bytes[b]);
}
}
//
// returns tokens:
// - StringEnd/RegexEnd ... string/regex closed
// - (Tokens)' ' ... space in word list
// - StringEmbeddedVariableBegin ... #$, #@ (start of an embedded global/instance variable)
// - StringEmbeddedCodeBegin ... #{ (start of an embedded expression)
// - StringContent ... string data
//
internal Tokens TokenizeString(StringContentTokenizer/*!*/ info) {
StringType stringKind = info.Properties;
bool whitespaceSeen = false;
// final separator in the list of words (see grammar):
if (stringKind == StringType.FinalWordSeparator) {
MarkTokenStart();
MarkSingleLineTokenEnd();
return Tokens.StringEnd;
}
MarkTokenStart();
int eolnWidth;
int c = ReadNormalizeEndOfLine(out eolnWidth);
// unterminated string (error recovery is slightly different from MRI):
if (c == -1) {
ReportError(Errors.UnterminatedString);
_unterminatedToken = true;
MarkSingleLineTokenEnd();
return Tokens.StringEnd;
}
bool isMultiline = c == '\n';
// skip whitespace in word list:
if ((stringKind & StringType.Words) != 0 && IsWhiteSpace(c)) {
isMultiline |= SkipWhitespace();
c = Read();
whitespaceSeen = true;
}
// end of the top-level string:
if (c == info.TerminatingCharacter && info.NestingLevel == 0) {
// end of words:
if ((stringKind & StringType.Words) != 0) {
// final separator in the list of words (see grammar):
info.Properties = StringType.FinalWordSeparator;
MarkTokenEnd(isMultiline);
return Tokens.WordSeparator;
}
// end of regex:
if ((stringKind & StringType.RegularExpression) != 0) {
_tokenValue.SetRegexOptions(ReadRegexOptions());
MarkTokenEnd(isMultiline);
return Tokens.RegexpEnd;
}
// end of string/symbol:
MarkTokenEnd(isMultiline);
return Tokens.StringEnd;
}
// word separator:
if (whitespaceSeen) {
Debug.Assert(!IsWhiteSpace(c));
Back(c);
MarkTokenEnd(isMultiline);
return Tokens.WordSeparator;
}
MutableStringBuilder content;
// start of #$variable, #@variable, #{expression} in a string:
if ((stringKind & StringType.ExpandsEmbedded) != 0 && c == '#') {
switch (Peek()) {
case '$':
case '@':
MarkSingleLineTokenEnd();
return StringEmbeddedVariableBegin();
case '{':
Skip('{');
MarkSingleLineTokenEnd();
return StringEmbeddedCodeBegin();
}
content = new MutableStringBuilder(_encoding);
content.Append('#');
} else {
content = new MutableStringBuilder(_encoding);
SeekRelative(-eolnWidth);
}
int nestingLevel = info.NestingLevel;
ReadStringContent(content, stringKind, info.TerminatingCharacter, info.OpeningParenthesis, ref nestingLevel);
info.NestingLevel = nestingLevel;
_tokenValue.SetStringContent(content);
MarkMultiLineTokenEnd();
return Tokens.StringContent;
}
private Tokens TokenizeExpandingHeredocContent(HeredocTokenizer/*!*/ heredoc) {
MutableStringBuilder content;
int c = Peek();
if (c == '#') {
Skip(c);
switch (Peek()) {
case '$':
case '@':
MarkSingleLineTokenEnd();
return StringEmbeddedVariableBegin();
case '{':
Skip('{');
MarkSingleLineTokenEnd();
return StringEmbeddedCodeBegin();
}
content = new MutableStringBuilder(_encoding);
content.Append('#');
} else {
content = new MutableStringBuilder(_encoding);
}
bool isIndented = (heredoc.Properties & StringType.IndentedHeredoc) != 0;
do {
// read string content upto the end of the line:
int tmp = 0;
c = ReadStringContent(content, heredoc.Properties, '\n', 0, ref tmp);
// stop reading on end-of-file or just before an embedded expression: #$, #$, #{
if (c != '\n') {
break;
}
// adds \n
content.Append((char)ReadNormalizeEndOfLine());
// TODO:
RefillBuffer();
// first char on the next line:
if (Peek() == -1) {
break;
}
} while (!LineContentEquals(heredoc.Label, isIndented));
_tokenValue.SetStringContent(content);
MarkMultiLineTokenEnd();
return Tokens.StringContent;
}
private void AppendEscapedOctalEscape(MutableStringBuilder/*!*/ content) {
int start = _bufferPos - 1;
ReadOctalEscape(0);
Debug.Assert(IsOctalDigit(_lineBuffer[start])); // first digit
content.Append(_lineBuffer, start, _bufferPos - start);
}