/**
* Wird aufgerufen um aus dem bergebenen CFMLString einen Ausdruck auszulesen und diese zu
* interpretieren. <br>
* Beispiel eines bergebenen String:<br>
* <code>session.firstName</code> oder <code>trim(left('test'&var1,3))</code> <br>
* EBNF:<br>
* <code>spaces impOp;</code>
*
* @param pc
* @param cfml
* @return
* @throws PageException
*/
public Object interpret(PageContext pc, ParserString cfml) throws PageException {
this.cfml = cfml;
this.pc = pc;
if (pc != null) fld = ((ConfigImpl) pc.getConfig()).getCombinedFLDs();
if (JSON_ARRAY == null) JSON_ARRAY = fld.getFunction("_jsonArray");
if (JSON_STRUCT == null) JSON_STRUCT = fld.getFunction("_jsonStruct");
cfml.removeSpace();
Ref ref = assignOp();
cfml.removeSpace();
if (cfml.isAfterLast()) {
return ref.getValue();
}
throw new ExpressionException("Syntax Error, invalid Expression [" + cfml.toString() + "]");
}
/**
* Hier werden die verschiedenen Mglichen Werte erkannt und jenachdem wird mit der passenden
* Methode weitergefahren <br>
* EBNF:<br>
* <code>string | number | dynamic | sharp;</code>
*
* @return CFXD Element
* @throws PageException
*/
private Ref checker() throws PageException {
Ref ref = null;
// String
if (cfml.isCurrentQuoter()) {
// mode=STATIC; is at the end of the string function because must set after execution
return string();
}
// Number
if (cfml.isCurrentDigit() || cfml.isCurrent('.')) {
// mode=STATIC; is at the end of the string function because must set after execution
return number();
}
// Dynamic
if ((ref = dynamic()) != null) {
mode = DYNAMIC;
return ref;
}
// Sharp
if ((ref = sharp()) != null) {
mode = DYNAMIC;
return ref;
}
// JSON
if ((ref = json(JSON_ARRAY, '[', ']')) != null) {
mode = DYNAMIC;
return ref;
}
if ((ref = json(JSON_STRUCT, '{', '}')) != null) {
mode = DYNAMIC;
return ref;
}
if (cfml.isAfterLast() && cfml.toString().trim().length() == 0) return new LString("");
// else Error
throw new ExpressionException(
"Syntax Error, Invalid Construct",
"at position " + cfml.getPos() + " in [" + cfml.toString() + "]");
}