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final int FILENOTFOUND = 14; final int FILEIOERROR = 15; final int INPUTIOERROR = 16; // Internal representation of the Small BASIC keywords. final int UNKNCOM = 0; final int PRINT = 1; final int INPUT = 2; final int IF = 3; final int THEN = 4; final int FOR = 5; final int NEXT = 6; final int TO = 7; final int GOTO = 8; final int GOSUB = 9; final int RETURN = 10; final int END = 11; final int EOL = 12; // This token indicates end-of-program. final String EOP = "\0"; // Codes for double-operators, such as <=. final char LE = 1; final char GE = 2; final char NE = 3; // Array for variables. private double vars[]; // This class links keywords with their keyword tokens. class Keyword { String keyword; // string form int keywordTok; // internal representation Keyword(String str, int t) { keyword = str; keywordTok = t; } } /* Table of keywords with their internal representation. All keywords must be entered lowercase. */ Keyword kwTable[] = { new Keyword("print", PRINT), // in this table.
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Keyword("input", INPUT), Keyword("if", IF), Keyword("then", THEN), Keyword("goto", GOTO), Keyword("for", FOR), Keyword("next", NEXT), Keyword("to", TO), Keyword("gosub", GOSUB), Keyword("return", RETURN), Keyword("end", END)
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private char[] prog; // refers to program array private int progIdx; // current index into program private String token; // holds current token private int tokType; // holds token's type private int kwToken; // internal representation of a keyword // Support for FOR loops. class ForInfo { int var; // counter variable double target; // target value int loc; // index in source code to loop to } // Stack for FOR loops. private Stack fStack; // Defines label table entries. class Label { String name; // label int loc; // index of label's location in source file public Label(String n, int i) { name = n; loc = i; } } // A map for labels. private TreeMap labelTable; // Stack for gosubs. private Stack gStack;
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// Relational operators. char rops[] = { GE, NE, LE, '<', '>', '=', 0 }; /* Create a string containing the relational operators in order to make checking for them more convenient. */ String relops = new String(rops); // Constructor for SBasic. public SBasic(String progName) throws InterpreterException { char tempbuf[] = new char[PROG_SIZE]; int size; // Load the program to execute. size = loadProgram(tempbuf, progName); if(size != -1) { // Create a properly sized array to hold the program. prog = new char[size]; // Copy the program into program array. System.arraycopy(tempbuf, 0, prog, 0, size); } } // Load a program. private int loadProgram(char[] p, String fname) throws InterpreterException { int size = 0; try { FileReader fr = new FileReader(fname); BufferedReader br = new BufferedReader(fr); size = br.read(p, 0, PROG_SIZE); fr.close(); } catch(FileNotFoundException exc) { handleErr(FILENOTFOUND);
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} catch(IOException exc) { handleErr(FILEIOERROR); } // If file ends with an EOF mark, back up. if(p[size-1] == (char) 26) size--; return size; // return size of program } // Execute the program. public void run() throws InterpreterException { // Initialize for new program run. vars = new double[26]; fStack = new Stack(); labelTable = new TreeMap(); gStack = new Stack(); progIdx = 0; scanLabels(); // find the labels in the program sbInterp(); // execute } // Entry point for the Small BASIC interpreter. private void sbInterp() throws InterpreterException { // This is the interpreter's main loop. do { getToken(); // Check for assignment statement. if(tokType==VARIABLE) { putBack(); // return the var to the input stream assignment(); // handle assignment statement } else // is keyword switch(kwToken) { case PRINT: print(); break; case GOTO: execGoto();
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