public void testPeekGivesTheNextCharaterWithoutAdvancing() throws IOException {
LexerSource src = newSource("abc");
assertTrue(src.peek('a'));
assertEquals('a', src.read());
}
public int parseStringIntoBuffer(RubyYaccLexer lexer, LexerSource src, ByteList buffer)
throws java.io.IOException {
boolean qwords = (flags & RubyYaccLexer.STR_FUNC_QWORDS) != 0;
boolean expand = (flags & RubyYaccLexer.STR_FUNC_EXPAND) != 0;
boolean escape = (flags & RubyYaccLexer.STR_FUNC_ESCAPE) != 0;
boolean regexp = (flags & RubyYaccLexer.STR_FUNC_REGEXP) != 0;
int c;
while ((c = src.read()) != RubyYaccLexer.EOF) {
if (begin != '\0' && c == begin) {
nest++;
} else if (c == end) {
if (nest == 0) {
src.unread(c);
break;
}
nest--;
} else if (c == '#' && expand && !src.peek('\n')) {
int c2 = src.read();
if (c2 == '$' || c2 == '@' || c2 == '{') {
src.unread(c2);
src.unread(c);
break;
}
src.unread(c2);
} else if (c == '\\') {
c = src.read();
switch (c) {
case '\n':
if (qwords) break;
if (expand) continue;
buffer.append('\\');
break;
case '\\':
if (escape) buffer.append(c);
break;
default:
if (regexp) {
src.unread(c);
parseEscapeIntoBuffer(src, buffer);
continue;
} else if (expand) {
src.unread(c);
if (escape) buffer.append('\\');
c = lexer.readEscape();
} else if (qwords && Character.isWhitespace(c)) {
/* ignore backslashed spaces in %w */
} else if (c != end && !(begin != '\0' && c == begin)) {
buffer.append('\\');
}
}
} else if (qwords && Character.isWhitespace(c)) {
src.unread(c);
break;
}
buffer.append(c);
}
return c;
}