use of com.google.refine.grel.ast.FunctionCallExpr in project OpenRefine by OpenRefine.
the class Parser method parseFactor.
/**
* <term> := <term-start> ( <path-segment> )*
* <term-start> :=
* <string> | <number> | - <number> | <regex> | <identifier> |
* <identifier> ( <expression-list> )
*
* <path-segment> := "[" <expression-list> "]"
* | "." <identifier>
* | "." <identifier> "(" <expression-list> ")"
*
*/
protected Evaluable parseFactor() throws ParsingException {
if (_token == null) {
throw makeException("Expecting something more at end of expression");
}
Evaluable eval = null;
if (_token.type == TokenType.String) {
eval = new LiteralExpr(_token.text);
next(false);
} else if (_token.type == TokenType.Regex) {
RegexToken t = (RegexToken) _token;
try {
Pattern pattern = Pattern.compile(_token.text, t.caseInsensitive ? Pattern.CASE_INSENSITIVE : 0);
eval = new LiteralExpr(pattern);
next(false);
} catch (Exception e) {
throw makeException("Bad regular expression (" + e.getMessage() + ")");
}
} else if (_token.type == TokenType.Number) {
eval = new LiteralExpr(((NumberToken) _token).value);
next(false);
} else if (_token.type == TokenType.Operator && _token.text.equals("-")) {
// unary minus?
next(true);
if (_token != null && _token.type == TokenType.Number) {
Number n = ((NumberToken) _token).value;
eval = new LiteralExpr(n instanceof Long ? -n.longValue() : -n.doubleValue());
next(false);
} else {
throw makeException("Bad negative number");
}
} else if (_token.type == TokenType.Identifier) {
String text = _token.text;
next(false);
if (_token == null || _token.type != TokenType.Delimiter || !_token.text.equals("(")) {
eval = "null".equals(text) ? new LiteralExpr(null) : new VariableExpr(text);
} else if ("PI".equals(text)) {
eval = new LiteralExpr(Math.PI);
next(false);
} else {
Function f = ControlFunctionRegistry.getFunction(text);
Control c = ControlFunctionRegistry.getControl(text);
if (f == null && c == null) {
throw makeException("Unknown function or control named " + text);
}
// swallow (
next(true);
List<Evaluable> args = parseExpressionList(")");
if (c != null) {
Evaluable[] argsA = makeArray(args);
String errorMessage = c.checkArguments(argsA);
if (errorMessage != null) {
throw makeException(errorMessage);
}
eval = new ControlCallExpr(argsA, c);
} else {
eval = new FunctionCallExpr(makeArray(args), f);
}
}
} else if (_token.type == TokenType.Delimiter && _token.text.equals("(")) {
next(true);
eval = parseExpression();
if (_token != null && _token.type == TokenType.Delimiter && _token.text.equals(")")) {
next(false);
} else {
throw makeException("Missing )");
}
} else if (_token.type == TokenType.Delimiter && _token.text.equals("[")) {
// [ ... ] array
// swallow [
next(true);
List<Evaluable> args = parseExpressionList("]");
eval = new FunctionCallExpr(makeArray(args), new ArgsToArray());
} else {
throw makeException("Missing number, string, identifier, regex, or parenthesized expression");
}
while (_token != null) {
if (_token.type == TokenType.Operator && _token.text.equals(".")) {
// swallow .
next(false);
if (_token == null || _token.type != TokenType.Identifier) {
throw makeException("Missing function name");
}
String identifier = _token.text;
next(false);
if (_token != null && _token.type == TokenType.Delimiter && _token.text.equals("(")) {
// swallow (
next(true);
Function f = ControlFunctionRegistry.getFunction(identifier);
if (f == null) {
throw makeException("Unknown function " + identifier);
}
List<Evaluable> args = parseExpressionList(")");
args.add(0, eval);
eval = new FunctionCallExpr(makeArray(args), f);
} else {
eval = new FieldAccessorExpr(eval, identifier);
}
} else if (_token.type == TokenType.Delimiter && _token.text.equals("[")) {
// swallow [
next(true);
List<Evaluable> args = parseExpressionList("]");
args.add(0, eval);
eval = new FunctionCallExpr(makeArray(args), ControlFunctionRegistry.getFunction("get"));
} else {
break;
}
}
return eval;
}
Aggregations