/**
* Liest einen Identifier aus und gibt diesen als String zurck. <br>
* EBNF:<br>
* <code>(letter | "_") {letter | "_"|digit};</code>
*
* @param firstCanBeNumber
* @return Identifier.
*/
private String identifier(boolean firstCanBeNumber) {
// int start = cfml.getPos();
if (!cfml.isCurrentLetter() && !cfml.isCurrentSpecial()) {
if (!firstCanBeNumber) return null;
else if (!cfml.isCurrentDigit()) return null;
}
StringBuffer sb = new StringBuffer();
// if(CASE_TYPE_UPPER==caseType)
sb.append(cfml.getCurrentUpper());
/*else if(CASE_TYPE_ORIGINAL==caseType)
sb.append(cfml.getCurrent());
else
sb.append(cfml.getCurrentLower());*/
do {
cfml.next();
if (!(cfml.isCurrentLetter() || cfml.isCurrentDigit() || cfml.isCurrentSpecial())) {
break;
}
// if(CASE_TYPE_UPPER==caseType)
sb.append(cfml.getCurrentUpper());
/*else if(CASE_TYPE_ORIGINAL==caseType)
sb.append(cfml.getCurrent());
else
sb.append(cfml.getCurrentLower());*/
} while (cfml.isValidIndex());
return sb.toString(); // cfml.substringLower(start,cfml.getPos()-start);
}
/**
* Transfomiert einen numerische Wert. Die L￤nge des numerischen Wertes interessiert nicht zu
* ￜbersetzungszeit, ein "Overflow" fhrt zu einem Laufzeitfehler. Da die zu erstellende CFXD,
* bzw. dieser Transfomer, keine Vorwegnahme des Laufzeitsystems vornimmt. <br>
* EBNF:<br>
* <code>["+"|"-"] digit {digit} {"." digit {digit}};</code>
*
* @return CFXD Element
* @throws PageException
*/
private Ref number() throws PageException {
// check first character is a number literal representation
// if(!cfml.isCurrentDigit()) return null;
StringBuffer rtn = new StringBuffer(6);
// get digit on the left site of the dot
if (cfml.isCurrent('.')) rtn.append('0');
else digit(rtn);
// read dot if exist
if (cfml.forwardIfCurrent('.')) {
rtn.append('.');
int before = cfml.getPos();
digit(rtn);
if (before < cfml.getPos() && cfml.forwardIfCurrent('e')) {
if (cfml.isCurrentDigit()) {
rtn.append('e');
digit(rtn);
} else {
cfml.previous();
}
}
// read right side of the dot
if (before == cfml.getPos()) throw new ExpressionException("Number can't end with [.]");
// rtn.append(rightSite);
}
cfml.removeSpace();
mode = STATIC;
return new LNumber(rtn.toString());
}
/**
* Liest die reinen Zahlen innerhalb des CFMLString aus und gibt diese als Zeichenkette zurck.
* <br>
* EBNF:<br>
* <code>"0"|..|"9";</code>
*
* @param rtn
*/
private void digit(StringBuffer rtn) {
while (cfml.isValidIndex()) {
if (!cfml.isCurrentDigit()) break;
rtn.append(cfml.getCurrentLower());
cfml.next();
}
}
/**
* 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() + "]");
}
