/**
* Add or replace initialization statement in this VarInit
*
* <p>Note: We create a Literal node (of the appropriate type) and add it to "varInit.expression"
*
* @param varType : Variable type
* @param varInit : Variable initialization
* @param vals : Value to assign
*/
boolean initializeArgs(Type varType, VariableInit varInit, ArrayList<String> vals) {
boolean usedVal = true;
try {
Literal literal = null;
if (varType.isList(Type.STRING)) {
// Create literal
LiteralListString lit = new LiteralListString(varInit, null);
literal = lit;
lit.setValue(vals); // Set literal value
} else
throw new RuntimeException(
"Cannot convert command line argument to variable type '" + varType + "'");
// Set varInit to literal
varInit.setExpression(literal);
} catch (Exception e) {
// Error parsing 'val'?
throw new RuntimeException("Cannot convert argument '" + vals + "' to type " + varType);
}
return usedVal;
}
/**
* Set command line arguments as global variables
*
* <p>How it works: - Program is executes as something like:
*
* <p>java -jar BigDataScript.jar [options] programFile.bds [programOptions]
*
* <p>- Any command line argument AFTER "programFile.bds" is considered a command line argument
* for the BigDataScript program. E.g.
*
* <p>java -jar BigDataScript.jar -v program.bds -file myFile.txt -verbose -num 7
*
* <p>So our program "program.bds" has command line options: -file myFile.txt -verbose -num 7
* (notice that "-v" is a command line option for loudScript.jar and not for "program.bds")
*
* <p>- We look for variables in ProgramUnit that match the name of these command line arguments
*
* <p>- Then we add those values to the variable initialization. Thus overriding any
* initialization values provided in the program. E.g.
*
* <p>Our program has the following variable declarations: string file = "default_file.txt" int
* num = 3 bool verbose = false
*
* <p>We execute the program: java -jar BigDataScript.jar -v program.bds -file myFile.txt -verbose
* -num 7
*
* <p>The variable declarations are replaced as follows: string file = "myFile.txt" int num = 7
* bool verbose = true
*
* <p>- Note: Only primitive types are supported (i.e.: string, bool, int & real)
*
* <p>- Note: Unmatched variables names will be silently ignored (same for variables that match,
* but are non-primitive)
*
* <p>- Note: If a variable is matched, is primitive, but cannot be converted. An error is thrown.
* E.g.: Program: int num = 1
*
* <p>Command line: java -jar BigDataScript.jar program.bds -num "hello" <- This is an error
* because 'num' is an int
*
* <p>- Note: Unprocessed arguments will be available to the program as an 'args' list
*/
void initializeArgs() {
// Set program arguments as global variables
for (int argNum = 0; argNum < programArgs.size(); argNum++) {
String arg = programArgs.get(argNum);
// Parse '-OPT' option
if (arg.equalsIgnoreCase("-h")
|| arg.equalsIgnoreCase("-help")
|| arg.equalsIgnoreCase("--help")) {
if (debug) Timer.showStdErr("Activating 'show help' mode");
showHelp = true;
} else if (arg.startsWith("-")) {
// Get variable name and value
String varName = arg.substring(1);
// Find all variable declarations that match this command line argument
for (VarDeclaration varDecl : programUnit.varDeclarations(true)) {
Type varType = varDecl.getType();
// Is is a primitive variable or a primitive list?
if (varType.isPrimitiveType() || varType.isList()) {
// Find an initialization that matches the command line argument
for (VariableInit varInit : varDecl.getVarInit())
if (varInit.getVarName().equals(varName)) { // Name matches?
int argNumOri = argNum;
boolean useVal = false;
if (varType.isList()) {
// Create a list of arguments and use them to initialize the variable (list)
ArrayList<String> vals = new ArrayList<String>();
for (int i = argNum + 1; i < programArgs.size(); i++)
if (programArgs.get(i).startsWith("-")) break;
else vals.add(programArgs.get(i));
useVal =
initializeArgs(
varType, varInit,
vals); // Found variable, try to replace or add LITERAL to this VarInit
} else if (varType.isBool()) {
String valStr = "true";
// Booleans may not have a value (just '-varName' sets them to 'true')
if (programArgs.size() > (argNum + 1)) {
// Is the next argument 'true' or 'false'? => Set argument
String boolVal = programArgs.get(argNum + 1);
if (valStr.equalsIgnoreCase("true") || valStr.equalsIgnoreCase("false"))
valStr = boolVal;
}
initializeArgs(varType, varInit, valStr);
} else {
String val =
(argNum < programArgs.size()
? programArgs.get(++argNum)
: ""); // Get one argument and use it to initialize the variable
useVal =
initializeArgs(
varType, varInit,
val); // Found variable, try to replace or add LITERAL to this VarInit
}
if (!useVal) argNum = argNumOri; // We did not use the arguments
}
}
}
}
}
// Make all unprocessed arguments available for the program (in 'args' list)
Scope.getGlobalScope()
.add(new ScopeSymbol(Scope.GLOBAL_VAR_ARGS_LIST, TypeList.get(Type.STRING), programArgs));
// Initialize program name
String programPath = programUnit.getFileName();
String progName = Gpr.baseName(programPath);
Scope.getGlobalScope()
.add(new ScopeSymbol(Scope.GLOBAL_VAR_PROGRAM_NAME, Type.STRING, progName));
Scope.getGlobalScope()
.add(new ScopeSymbol(Scope.GLOBAL_VAR_PROGRAM_PATH, Type.STRING, programPath));
}