/**
* Parse a string value and covert it to its proper data type.
*
* @param value
* @return The parsed value.
* @throws ParsingException Thrown if not Advisory is available and there was an error parsing.
*/
@SuppressWarnings("unchecked")
public static <T> T parseValue(String value) throws ParsingException {
final T result;
assert value != null;
/*
* todo Restructure the whole class so I've got parse and parseArray as
* static methods and the share code properly.
*/
if ("null".equals(value)) {
result = null;
} else {
final List<Object> list = new ArrayList<>();
final Text t = new Text();
t.append(value);
if (any(t, list) && t.isEof()) {
result = (T) list.get(0);
} else {
error("Count not parse value: " + value);
result = null;
}
}
return result;
}
/**
* Convert a value to an Oak markup representation.
*
* @param value The value to represent.
* @param tb The buffer in which to write the markup.
*/
public void toMarkup(Object value, Text t) {
if (value == null) {
t.append("null");
} else {
switch (this) {
case z:
case Z:
case f:
case F:
case bool:
t.append(value.toString());
break;
case cardinality:
((Cardinality) value).toString(t);
break;
case text:
escapeForOak((String) value, true, t);
break;
case identifier:
t.append(value.toString());
break;
case path:
((Path) value).toString(t);
break;
case datetime:
t.append('@');
t.append(DateU.formatStandardDatetime((LocalDateTime) value));
break;
case date:
t.append('@');
t.append(DateU.formatStandardDate((LocalDate) value));
break;
case time:
t.append('@');
t.append(DateU.formatStandardTime((LocalTime) value));
break;
case any:
default:
throw new UnexpectedException("asString: " + this);
}
}
}
/**
* Convert a list of values to an Oak markup String, e.g. "[ true, null, false ]".
*
* @param values The list of values
* @return An Oak markup representation of the values.
* @see #parse(String)
*/
public String toString(List<Object> values) {
assert values != null : "Arrays can't be null, only empty";
final Text t = new Text(true);
t.append('[');
if (values.size() > 0) {
t.space();
for (final Object value : values) {
t.delimit();
toMarkup(value, t);
}
t.space();
}
t.append(']');
return t.toString();
}
public static void toString(Object value, Text t) {
if (value == null) {
t.append("null");
} else {
final Class<? extends Object> clazz = value.getClass();
final DataType type = getDataType(clazz);
if (type == null) {
throw new RuntimeException("Invalid type: " + clazz.getName());
}
type.toMarkup(value, t);
}
}
/**
* Parse a string into a list of data values. White space is supported only in between the [square
* brackets].
*
* @param string A string representation of an Oak property array, e.g. [ true, null, false ]
* @param type The type of the array, may be 'any'.
* @return A potentially empty but not null list of values.
*/
@SuppressWarnings("unchecked")
public static <T> List<T> parseArray(String string, DataType type) {
final List<?> result;
final Text t = new Text();
t.append(string);
if (t.consume('[')
&& (result = elementList(t, type)) != null
&& (t.ws() && t.consume(']'))
&& t.isEof()) {
// OK
} else {
throw new ParsingException("Invalid array: " + string);
}
return (List<T>) result;
}
/**
* Escape a string for Oak. If the string is null then "null" is returned otherwise the string is
* returned with [tn\"] escaped \r discarded and the whole thing surrounded in quotes if
* requested.
*
* @param string The String to process.
* @param quote Double quotes are added if true.
* @param result Where to place the processed String.
*/
public static void escapeForOak(String string, boolean quote, Text result) {
if (string == null) {
result.append("null");
} else {
if (quote) {
result.append('"');
}
final char[] ca = string.toCharArray();
for (final char c : ca) {
switch (c) {
case '\t':
result.append("\\t");
break;
case '\n':
result.append("\\n");
break;
case '\"':
result.append("\\\"");
break;
case '\\':
result.append("\\\\");
break;
default:
if (c < ' ' || c >= '~') {
// Must be four digits
result.append("\\u" + Integer.toHexString(c | 0x10000).substring(1));
} else {
result.append(c);
}
}
}
if (quote) {
result.append('"');
}
}
}
/**
* Convert a potentially escaped string to text.
*
* @param t The source string.
* @param start Starting offset.
* @param end Ending offset.
* @return Return the un-escaped string which may be zero-length but not null.
*/
private static String unescape(Text t, int start, int end) {
final Text result = new Text();
/*
* We know that there's a starting and ending quote that's been removed
* from the string but otherwise we can't trust the contents.
*/
for (int i = start; i < end; i++) {
final char c = t.charAt(i);
final char escaped;
if (c == '\\') {
if (i < end - 1) {
i++;
final char next = t.charAt(i);
if (next == 't') {
escaped = '\t';
} else if (next == 'n') {
escaped = '\n';
} else if (next == '"') {
escaped = '"';
} else if (next == '\\') {
escaped = '\\';
} else {
error("Invalid escape: '\\" + next + '\'');
escaped = next;
}
} else {
error("Unterminated string");
escaped = c;
}
} else {
escaped = c;
}
result.append(escaped);
}
return result.toString();
}
/**
* In Oak it is possible to embed a tab character as an ASCII 8 or as a \t but internally we store
* this in ASCII. The same goes for newlines and other tables (see the Oak reference). Here we
* convert external format to internal format.
*
* @param source The text to process, may be null. E.g. "Hello\tworld" (with the quotes)
* @return Return an internal format string.
*/
@Nullable
public static String textToInternalFormat(@Nullable String source) throws ParsingException {
final String result;
assert source == null
|| source.length() >= 2
&& source.charAt(0) == '"'
&& source.charAt(source.length() - 1) == '"';
if (source == null) {
result = null;
} else {
final Text t = new Text();
final char[] ca = source.toCharArray();
final int length = ca.length - 1; // 1 because remove quotes
for (int i = 1; i < length; i++) { // 1 because remove quotes
final char c = ca[i];
if (c == '\\') {
if (i == length - 1) {
error("Invalid text " + source + ", escape at end of line");
} else {
i++;
final char next = ca[i];
if (next == 't') {
t.append('\t');
} else if (next == 'n') {
t.append('\n');
} else if (next == '"') {
t.append('"');
} else if (next == '\\') {
t.append('\\');
} else if (next == 'u') {
// Unicode, 1-4 hex characters...
i++;
final Text hex = new Text();
hex.append(source);
hex.setCursor(i);
final int start = i;
if (hex.consumeAscii(Text.ASCII_0_F)) {
final int end = start + Math.min(4, hex.cursor() - start);
final String string = hex.getString(start, end);
final char u = (char) Integer.parseInt(string, 16);
t.append(u);
i = end - 1;
} else {
error("Invalid text " + source + ", incorrect unicode");
}
} else {
error("Invalid text: \\" + next);
}
}
} else {
t.append(c);
}
}
result = t.toString();
}
return result;
}
