void SExpr::toStream(std::ostream& out, const SExpr& sexpr, OutputLanguage language, int indent) throw() {
if( sexpr.isKeyword() && languageQuotesKeywords(language) ){
out << quoteSymbol(sexpr.getValue());
} else {
toStreamRec(out, sexpr, language, indent);
}
}
void SExpr::toStreamRec(std::ostream& out, const SExpr& sexpr,
OutputLanguage language, int indent) {
StreamFormatScope scope(out);
if (sexpr.isInteger()) {
out << sexpr.getIntegerValue();
} else if (sexpr.isRational()) {
const double approximation = sexpr.getRationalValue().getDouble();
out << std::fixed << approximation;
} else if (sexpr.isKeyword()) {
out << sexpr.getValue();
} else if (sexpr.isString()) {
std::string s = sexpr.getValue();
// escape backslash and quote
for (size_t i = 0; i < s.length(); ++i) {
if (s[i] == '"') {
s.replace(i, 1, "\\\"");
++i;
} else if (s[i] == '\\') {
s.replace(i, 1, "\\\\");
++i;
}
}
out << "\"" << s << "\"";
} else {
const std::vector<SExpr>& kids = sexpr.getChildren();
out << (indent > 0 && kids.size() > 1 ? "( " : "(");
bool first = true;
for (std::vector<SExpr>::const_iterator i = kids.begin(); i != kids.end();
++i) {
if (first) {
first = false;
} else {
if (indent > 0) {
out << "\n" << std::string(indent, ' ');
} else {
out << ' ';
}
}
toStreamRec(out, *i, language,
indent <= 0 || indent > 2 ? 0 : indent + 2);
}
if (indent > 0 && kids.size() > 1) {
out << '\n';
if (indent > 2) {
out << std::string(indent - 2, ' ');
}
}
out << ')';
}
} /* toStreamRec() */
