private int parseRegexpFlags(final LexerSource src) throws java.io.IOException {
char kcode = 0;
int options = 0;
int c;
StringBuilder unknownFlags = new StringBuilder(10);
for (c = src.read(); c != RubyYaccLexer.EOF && Character.isLetter(c); c = src.read()) {
switch (c) {
case 'i':
options |= ReOptions.RE_OPTION_IGNORECASE;
break;
case 'x':
options |= ReOptions.RE_OPTION_EXTENDED;
break;
case 'm':
options |= ReOptions.RE_OPTION_MULTILINE;
break;
case 'o':
options |= ReOptions.RE_OPTION_ONCE;
break;
case 'n':
kcode = 16;
break;
case 'e':
kcode = 32;
break;
case 's':
kcode = 48;
break;
case 'u':
kcode = 64;
break;
case 'j':
options |= 256; // Regexp engine 'java'
break;
default:
unknownFlags.append((char) c);
break;
}
}
src.unread(c);
if (unknownFlags.length() != 0) {
throw new SyntaxException(
PID.REGEXP_UNKNOWN_OPTION,
src.getPosition(),
"unknown regexp option"
+ (unknownFlags.length() > 1 ? "s" : "")
+ " - "
+ unknownFlags.toString(),
unknownFlags.toString());
}
return options | kcode;
}
// Was a goto in original ruby lexer
private void escaped(LexerSource src, ByteList buffer) throws java.io.IOException {
int c;
switch (c = src.read()) {
case '\\':
parseEscapeIntoBuffer(src, buffer);
break;
case RubyYaccLexer.EOF:
throw new SyntaxException(
PID.INVALID_ESCAPE_SYNTAX,
src.getPosition(),
src.getCurrentLine(),
"Invalid escape character syntax");
default:
buffer.append(c);
}
}
public int parseString(RubyYaccLexer lexer, LexerSource src) throws java.io.IOException {
boolean spaceSeen = false;
int c;
// FIXME: How much more obtuse can this be?
// Heredoc already parsed this and saved string...Do not parse..just return
if (flags == -1) {
lexer.setValue(new Token("\"", lexer.getPosition()));
return Tokens.tSTRING_END;
}
c = src.read();
if ((flags & RubyYaccLexer.STR_FUNC_QWORDS) != 0 && Character.isWhitespace(c)) {
do {
c = src.read();
} while (Character.isWhitespace(c));
spaceSeen = true;
}
if (c == end && nest == 0) {
if ((flags & RubyYaccLexer.STR_FUNC_QWORDS) != 0) {
flags = -1;
lexer.getPosition();
return ' ';
}
if ((flags & RubyYaccLexer.STR_FUNC_REGEXP) != 0) {
lexer.setValue(
new RegexpNode(src.getPosition(), ByteList.create(""), parseRegexpFlags(src)));
return Tokens.tREGEXP_END;
}
lexer.setValue(new Token("\"", lexer.getPosition()));
return Tokens.tSTRING_END;
}
if (spaceSeen) {
src.unread(c);
lexer.getPosition();
return ' ';
}
// Single-quote fast path
if (begin == '\0' && flags == 0) {
ByteList buffer = new ByteList();
src.unread(c);
if (parseSimpleStringIntoBuffer(src, buffer) == RubyYaccLexer.EOF) {
throw new SyntaxException(
PID.STRING_HITS_EOF,
src.getPosition(),
src.getCurrentLine(),
"unterminated string meets end of file");
}
/*
ByteList buffer;
src.unread(c);
if ((buffer = src.readUntil(end)) == null) {
throw new SyntaxException(src.getPosition(), "unterminated string meets end of file");
}
*/
lexer.setValue(new StrNode(lexer.getPosition(), buffer));
return Tokens.tSTRING_CONTENT;
}
ByteList buffer = new ByteList();
if ((flags & RubyYaccLexer.STR_FUNC_EXPAND) != 0 && c == '#') {
c = src.read();
switch (c) {
case '$':
case '@':
src.unread(c);
lexer.setValue(new Token("#" + c, lexer.getPosition()));
return Tokens.tSTRING_DVAR;
case '{':
lexer.setValue(new Token("#" + c, lexer.getPosition()));
return Tokens.tSTRING_DBEG;
}
buffer.append((byte) '#');
}
src.unread(c);
if (parseStringIntoBuffer(lexer, src, buffer) == RubyYaccLexer.EOF) {
throw new SyntaxException(
PID.STRING_HITS_EOF,
src.getPosition(),
src.getCurrentLine(),
"unterminated string meets end of file");
}
lexer.setValue(new StrNode(lexer.getPosition(), buffer));
return Tokens.tSTRING_CONTENT;
}
private void parseEscapeIntoBuffer(LexerSource src, ByteList buffer) throws java.io.IOException {
int c;
switch (c = src.read()) {
case '\n':
break; /* just ignore */
case '0':
case '1':
case '2':
case '3': /* octal constant */
case '4':
case '5':
case '6':
case '7':
buffer.append('\\');
buffer.append(c);
for (int i = 0; i < 2; i++) {
c = src.read();
if (c == RubyYaccLexer.EOF) {
throw new SyntaxException(
PID.INVALID_ESCAPE_SYNTAX,
src.getPosition(),
src.getCurrentLine(),
"Invalid escape character syntax");
}
if (!RubyYaccLexer.isOctChar(c)) {
src.unread(c);
break;
}
buffer.append(c);
}
break;
case 'x': /* hex constant */
buffer.append('\\');
buffer.append(c);
c = src.read();
if (!RubyYaccLexer.isHexChar(c)) {
throw new SyntaxException(
PID.INVALID_ESCAPE_SYNTAX,
src.getPosition(),
src.getCurrentLine(),
"Invalid escape character syntax");
}
buffer.append(c);
c = src.read();
if (RubyYaccLexer.isHexChar(c)) {
buffer.append(c);
} else {
src.unread(c);
}
break;
case 'M':
if ((c = src.read()) != '-') {
throw new SyntaxException(
PID.INVALID_ESCAPE_SYNTAX,
src.getPosition(),
src.getCurrentLine(),
"Invalid escape character syntax");
}
buffer.append(new byte[] {'\\', 'M', '-'});
escaped(src, buffer);
break;
case 'C':
if ((c = src.read()) != '-') {
throw new SyntaxException(
PID.INVALID_ESCAPE_SYNTAX,
src.getPosition(),
src.getCurrentLine(),
"Invalid escape character syntax");
}
buffer.append(new byte[] {'\\', 'C', '-'});
escaped(src, buffer);
break;
case 'c':
buffer.append(new byte[] {'\\', 'c'});
escaped(src, buffer);
break;
case RubyYaccLexer.EOF:
throw new SyntaxException(
PID.INVALID_ESCAPE_SYNTAX,
src.getPosition(),
src.getCurrentLine(),
"Invalid escape character syntax");
default:
if (c != '\\' || c != end) {
buffer.append('\\');
}
buffer.append(c);
}
}