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package bjc.utils.ioutils.format;
import java.util.ArrayList;
import java.util.List;
import bjc.utils.esodata.Tape;
/**
* Represents a set of parameters to a CL format directive.
*
* @author Benjamin Culkin
*/
public class CLParameters {
private String[] params;
/**
* Create a new set of CL format parameters.
*
* @param params
* The CL format parameters to use.
*/
public CLParameters(String[] params) {
this.params = params;
}
/**
* Get the length of the parameter list.
*
* @return The length of the parameters.
*/
public int length() {
return params.length;
}
/**
* Creates a set of parameters from an array of parameters.
*
* Mostly, this just fills in V and # parameters.
*
* @param params
* The parameters of the directive.
* @param dirParams
* The parameters of the format string.
*
* @return A set of CL parameters.
*/
public static CLParameters fromDirective(String[] params, Tape<Object> dirParams) {
List<String> parameters = new ArrayList<>();
for(String param : params) {
if(param.equalsIgnoreCase("V")) {
Object par = dirParams.item();
boolean succ = dirParams.right();
if(!succ) {
throw new IllegalStateException("Couldn't advance tape for parameter");
}
if(par == null) {
throw new IllegalArgumentException(
"Expected a format parameter for V inline parameter");
}
if(par instanceof Number) {
int val = ((Number) par).intValue();
parameters.add(Integer.toString(val));
} else if(par instanceof Character) {
char ch = ((Character) par);
parameters.add(Character.toString(ch));
} else {
throw new IllegalArgumentException(
"Incorrect type of parameter for V inline parameter");
}
} else if(param.equals("#")) {
parameters.add(Integer.toString(dirParams.position()));
} else {
parameters.add(param);
}
}
return new CLParameters(parameters.toArray(new String[0]));
}
/**
* Get an optional character parameter with a default value.
*
* @param idx
* The index the parameter is at.
* @param paramName
* The name of the parameter.
* @param directive
* The directive this parameter belongs to.
* @param def
* The default value for the parameter.
* @return The value of the parameter if it exists, or the default
* otherwise.
*/
public char getCharDefault(int idx, String paramName, char directive, char def) {
if(!params[idx].equals("")) {
return getChar(idx, paramName, directive);
}
return def;
}
/**
* Get a mandatory character parameter.
*
* @param idx
* The index the parameter is at.
* @param paramName
* The name of the parameter.
* @param directive
* The directive this parameter belongs to.
* @return The value for the parameter.
*/
public char getChar(int idx, String paramName, char directive) {
String param = params[idx];
if(!param.startsWith("'")) {
throw new IllegalArgumentException(
String.format("Invalid %s %s to %c directive", paramName, param, directive));
}
return param.charAt(1);
}
/**
* Get an optional integer parameter with a default value.
*
* @param idx
* The index the parameter is at.
* @param paramName
* The name of the parameter.
* @param directive
* The directive this parameter belongs to.
* @param def
* The default value for the parameter.
* @return The value of the parameter if it exists, or the default
* otherwise.
*/
public int getIntDefault(int idx, String paramName, char directive, int def) {
if(!params[idx].equals("")) {
return getInt(idx, paramName, directive);
}
return def;
}
/**
* Get a mandatory integer parameter.
*
* @param idx
* The index the parameter is at.
* @param paramName
* The name of the parameter.
* @param directive
* The directive this parameter belongs to.
* @return The value for the parameter.
*/
public int getInt(int idx, String paramName, char directive) {
String param = params[idx];
try {
return Integer.parseInt(param);
} catch(NumberFormatException nfex) {
String msg = String.format("Invalid %s %s to %c directive", paramName, param, directive);
IllegalArgumentException iaex = new IllegalArgumentException(msg);
iaex.initCause(nfex);
throw iaex;
}
}
}
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