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package Compiler;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.Path;
import java.util.List;
import java.util.Scanner;
import java.util.ArrayList;
/**
*Base class for running the Compiler
*Can run either from a file, or in an interactive mode
*/
public class Language {
static boolean leaveCFile = false;
static boolean hadError = false;
static boolean printC = false;
static boolean executeAfter = false;
static Path sourcefile;
//Main function for the compiler
public static void main(String[] args) {
//Extract required command line arguments
try {
sourcefile = Paths.get(args[0]);
} catch (java.lang.ArrayIndexOutOfBoundsException e) {
interactiveMode();
return;
}
if (args[0].equals("-h") || args[0].equals("--help")) {
System.out.println(getHelpText());
return;
}
if (!(Files.exists(sourcefile))) {
System.err.println("Could not find source code path.");
return;
}
Path initOutPath = Paths.get(args[0]);
String outname = initOutPath.getName(initOutPath.getNameCount() - 1).toString().split("\\.(?=[^\\.]+$)")[0];
//Extract optional command line arguments
ArrayList<String> arrayArgs = new ArrayList<>();
for (int i = 0; i < args.length; i++) {
String arg = args[i];
arrayArgs.add(arg);
if (arg.equals("-o") || arg.equals("--out")) {
try {
outname = args[i + 1];
} catch (java.lang.ArrayIndexOutOfBoundsException e) {
System.err.println("Invalid output name provided");
return;
}
}
if (arg.equals("-c") || arg.equals("--keep-c-file")) {
leaveCFile = true;
}
if (arg.equals("-pc") || arg.equals("--print-c")) {
printC = true;
}
if (arg.equals("-e") || arg.equals("--execute")) {
executeAfter = true;
}
}
if (outname.startsWith("-")) {
System.err.println("Invalid output name provided");
return;
}
//Run the compiler on the source code
try {
runCompiler(Files.readString(sourcefile), outname);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Function to take source code, run the compiler and write to C
*
* @param sourcecode the full source code as a string
* @param outName the name to write the compiled code to
*/
private static void runCompiler(String sourceCode, String outName){
//Extract tokens from the source code
TokenScanner scanner = new TokenScanner();
List<Token> tokens = scanner.extractTokens(sourceCode);
if (hadError) return;
//Parse into AST
Parser parser = new Parser(tokens);
List<Statement> ast = parser.parse();
if (hadError) return;
//Translate AST into equivalent C code
Translator translator = new Translator();
List<String> code = translator.compileToC(ast, printC);
if (hadError) return;
//Execute created C code
ExecuteC cExecutor = new ExecuteC();
cExecutor.compileAndExecuteC(code, outName, executeAfter, leaveCFile);
}
/**
* Method for running the compiler in an interactive mode
*/
private static void interactiveMode() {
Scanner input = new Scanner(System.in);
String sourceCode = "1";
//Run compiler line by line
while (sourceCode!=""){
System.out.print("Code: ");
sourceCode = input.nextLine();
runCompiler(sourceCode, "out");
hadError=false;
}
input.close();
}
/**
* Method for displaying an error to the user
* @param line the line the error occured on
* @param message an error message to display to the user
*/
static void displayError(int line,String message){
hadError=true;
System.out.println("An error was encountered on line: "+line);
System.out.println(message);
}
static void displayError(String message){
hadError=true;
System.out.println("An error was encountered");
System.out.println(message);
}
/**
* Method for displaying error based on a specific token
* @param token the token the parser detected the error on
* @param message an error message to display to the user
*/
static void displayError(Token token,String message){
hadError=true;
System.out.println("An error was encountered on line: "+token.line);
System.out.println("ERROR: "+token.text);
System.out.println(message);
}
/**
* Method for getting the helpfile text
* @return the text for the helpfile
*/
private static String getHelpText(){
String helpText = "";
try {
helpText = Utils.readFile("Compiler/helpfile.txt");
}
// Catch any IO exceptions
catch (IOException e) {
System.out.println(e);
}
// Catch anything else
catch (Exception e) {
System.out.println(e);
}
return helpText;
}
}
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