public static int doMain(
String[] args, String[] env, boolean initial, InputStream inStream, OutputStream outStream) {
RCmdOptions options = RCmdOptions.parseArguments(RCmdOptions.Client.R, args, false);
options.printHelpAndVersion();
PolyglotEngine vm =
createPolyglotEngineFromCommandLine(options, false, initial, inStream, outStream, env);
return readEvalPrint(vm);
}
static PolyglotEngine createPolyglotEngineFromCommandLine(
RCmdOptions options,
boolean embedded,
boolean initial,
InputStream inStream,
OutputStream outStream,
String[] env) {
RStartParams rsp = new RStartParams(options, embedded);
String fileArg = options.getString(FILE);
if (fileArg != null) {
if (options.getStringList(EXPR) != null) {
Utils.rSuicide("cannot use -e with -f or --file");
}
if (!rsp.getSlave()) {
rsp.setSaveAction(SA_TYPE.NOSAVE);
}
if (fileArg.equals("-")) {
// means stdin, but still implies NO_SAVE
fileArg = null;
} else {
fileArg = unescapeSpace(fileArg);
}
// cf GNU R
rsp.setInteractive(false);
}
/*
* Outputting the welcome message here has the virtue that the VM initialization delay
* occurs later. However, it does not work in embedded mode as console redirects have not
* been installed at this point. So we do it later in REmbedded.
*/
if (!rsp.getQuiet() && !embedded) {
System.out.println(RRuntime.WELCOME_MESSAGE);
}
/*
* Whether the input is from stdin, a file (-f), or an expression on the command line (-e)
* it goes through the console. N.B. -f and -e can't be used together and this is already
* checked.
*/
ConsoleHandler consoleHandler;
if (fileArg != null) {
List<String> lines;
String filePath;
try {
/*
* If initial==false, ~ expansion will not have been done and the open will fail.
* It's harmless to always do it.
*/
File file = new File(Utils.tildeExpand(fileArg));
lines = Files.readAllLines(file.toPath());
filePath = file.getCanonicalPath();
} catch (IOException e) {
if (initial) {
throw Utils.rSuicide(String.format(RError.Message.NO_SUCH_FILE.message, fileArg));
} else {
throw RError.error(RError.NO_CALLER, RError.Message.NO_SUCH_FILE, fileArg);
}
}
consoleHandler = new StringConsoleHandler(lines, outStream, filePath);
} else if (options.getStringList(EXPR) != null) {
List<String> exprs = options.getStringList(EXPR);
for (int i = 0; i < exprs.size(); i++) {
exprs.set(i, unescapeSpace(exprs.get(i)));
}
if (!rsp.getSlave()) {
rsp.setSaveAction(SA_TYPE.NOSAVE);
}
// cf GNU R
rsp.setInteractive(false);
consoleHandler =
new StringConsoleHandler(exprs, outStream, RSource.Internal.EXPRESSION_INPUT.string);
} else {
/*
* GnuR behavior differs from the manual entry for {@code interactive} in that {@code
* --interactive} never applies to {@code -e/-f}, only to console input that has been
* redirected from a pipe/file etc.
*
* If we are in embedded mode, the creation of ConsoleReader and the ConsoleHandler
* should be lazy, as these may not be necessary and can cause hangs if stdin has been
* redirected.
*/
Console sysConsole = System.console(); // TODO fix for context sessions
boolean isInteractive = options.getBoolean(INTERACTIVE) || sysConsole != null;
if (!isInteractive
&& rsp.getSaveAction() != SA_TYPE.SAVE
&& rsp.getSaveAction() != SA_TYPE.NOSAVE) {
String msg = "you must specify '--save', '--no-save' or '--vanilla'";
if (initial) {
throw Utils.rSuicide(msg);
} else {
throw RError.error(RError.NO_CALLER, RError.Message.GENERIC, msg);
}
}
if (embedded) {
consoleHandler = new EmbeddedConsoleHandler(rsp);
} else {
boolean useReadLine = !rsp.getNoReadline();
if (useReadLine) {
consoleHandler = new JLineConsoleHandler(rsp, inStream, outStream);
} else {
consoleHandler = new DefaultConsoleHandler(inStream, outStream);
}
}
}
return ContextInfo.create(
rsp,
env,
ContextKind.SHARE_NOTHING,
initial ? null : RContext.getInstance(),
consoleHandler)
.createVM();
}