-// Copyright 2002 Adam Megacz, see the COPYING file for licensing [GPL]
+// Copyright 2003 Adam Megacz, see the COPYING file for licensing [GPL]
package org.xwt.js;
import org.xwt.util.*;
import java.io.*;
+/**
+ * Parses a stream of lexed tokens into a tree of JSFunction's.
+ *
+ * There are three kinds of things we parse: blocks, statements, and
+ * expressions.
+ *
+ * - Expressions are a special type of statement that evaluates to a
+ * value (for example, "break" is not an expression, * but "3+2"
+ * is). Some tokens sequences start expressions (for * example,
+ * literal numbers) and others continue an expression which * has
+ * already been begun (for example, '+'). Finally, some *
+ * expressions are valid targets for an assignment operation; after
+ * * each of these expressions, continueExprAfterAssignable() is
+ * called * to check for an assignment operation.
+ *
+ * - A statement ends with a semicolon and does not return a value.
+ *
+ * - A block is a single statement or a sequence of statements
+ * surrounded by curly braces.
+ *
+ * Each parsing method saves the parserLine before doing its actual
+ * work and restores it afterwards. This ensures that parsing a
+ * subexpression does not modify the line number until a token
+ * *after* the subexpression has been consumed by the parent
+ * expression.
+ *
+ * Technically it would be a better design for this class to build an
+ * intermediate parse tree and use that to emit bytecode. Here's the
+ * tradeoff:
+ *
+ * Advantages of building a parse tree:
+ * - easier to apply optimizations
+ * - would let us handle more sophisticated languages than JavaScript
+ *
+ * Advantages of leaving out the parse tree
+ * - faster compilation
+ * - less load on the garbage collector
+ * - much simpler code, easier to understand
+ * - less error-prone
+ *
+ * Fortunately JS is such a simple language that we can get away with
+ * the half-assed approach and still produce a working, complete
+ * compiler.
+ *
+ * The bytecode language emitted doesn't really cause any appreciable
+ * semantic loss, and is itself a parseable language very similar to
+ * Forth or a postfix variant of LISP. This means that the bytecode
+ * can be transformed into a parse tree, which can be manipulated.
+ * So if we ever want to add an optimizer, it could easily be done by
+ * producing a parse tree from the bytecode, optimizing that tree,
+ * and then re-emitting the bytecode. The parse tree node class
+ * would also be much simpler since the bytecode language has so few
+ * operators.
+ *
+ * Actually, the above paragraph is slightly inaccurate -- there are
+ * places where we push a value and then perform an arbitrary number
+ * of operations using it before popping it; this doesn't parse well.
+ * But these cases are clearly marked and easy to change if we do
+ * need to move to a parse tree format.
+ */
+class Parser extends Lexer implements ByteCodes {
-/** parses a stream of lexed tokens into a tree of Expr's */
-public class Parser extends Lexer {
// Constructors //////////////////////////////////////////////////////
- public Parser(Reader r, String sourceName, int line) throws IOException {
- super(r);
- this.sourceName = sourceName;
- this.line = line;
- }
+ public Parser(Reader r, String sourceName, int line) throws IOException { super(r, sourceName, line); }
/** for debugging */
public static void main(String[] s) throws Exception {
- Parser p = new Parser(new InputStreamReader(System.in), "stdin", 0);
- while(true) {
- Expr block = p.parseBlock(false);
- if (block == null) return;
- System.out.println(block);
- if (p.peekToken() == -1) return;
- }
+ JSFunction block = JSFunction.fromReader("stdin", 0, new InputStreamReader(System.in));
+ if (block == null) return;
+ System.out.println(block);
}
static byte[] precedence = new byte[MAX_TOKEN + 1];
static boolean[] isRightAssociative = new boolean[MAX_TOKEN + 1];
+ // Use this as the precedence when we want anything up to the comma
+ private final static int NO_COMMA = 2;
static {
- precedence[ASSIGN] = 1;
- isRightAssociative[ASSIGN] = true;
- precedence[HOOK] = 2;
- precedence[COMMA] = 3;
- precedence[OR] = precedence[AND] = 4;
- precedence[GT] = precedence[GE] = 5;
- precedence[BITOR] = 6;
- precedence[BITXOR] = 7;
- precedence[BITAND] = 8;
- precedence[EQ] = precedence[NE] = 9;
- precedence[LT] = precedence[LE] = 10;
- precedence[SHEQ] = precedence[SHNE] = 11;
- precedence[LSH] = precedence[RSH] = precedence[URSH] = 12;
- precedence[ADD] = precedence[SUB] = 13;
- precedence[MUL] = precedence[DIV] = precedence[MOD] = 14;
- precedence[BITNOT] = precedence[INSTANCEOF] = 15;
- precedence[INC] = precedence[DEC] = 16;
- precedence[LP] = 17;
- precedence[LB] = 18;
- precedence[DOT] = 19;
+ isRightAssociative[ASSIGN] =
+ isRightAssociative[ASSIGN_BITOR] =
+ isRightAssociative[ASSIGN_BITXOR] =
+ isRightAssociative[ASSIGN_BITAND] =
+ isRightAssociative[ASSIGN_LSH] =
+ isRightAssociative[ASSIGN_RSH] =
+ isRightAssociative[ASSIGN_URSH] =
+ isRightAssociative[ASSIGN_ADD] =
+ isRightAssociative[ASSIGN_SUB] =
+ isRightAssociative[ASSIGN_MUL] =
+ isRightAssociative[ASSIGN_DIV] =
+ isRightAssociative[ASSIGN_MOD] = true;
+
+ precedence[COMMA] = 1;
+ // 2 is intentionally left unassigned. we use minPrecedence==2 for comma separated lists
+ precedence[ASSIGN] =
+ precedence[ASSIGN_BITOR] =
+ precedence[ASSIGN_BITXOR] =
+ precedence[ASSIGN_BITAND] =
+ precedence[ASSIGN_LSH] =
+ precedence[ASSIGN_RSH] =
+ precedence[ASSIGN_URSH] =
+ precedence[ASSIGN_ADD] =
+ precedence[ASSIGN_SUB] =
+ precedence[ASSIGN_MUL] =
+ precedence[ASSIGN_DIV] =
+ precedence[ASSIGN_MOD] = 3;
+ precedence[HOOK] = 4;
+ precedence[OR] = 5;
+ precedence[AND] = 6;
+ precedence[BITOR] = 7;
+ precedence[BITXOR] = 8;
+ precedence[BITAND] = 9;
+ precedence[EQ] = precedence[NE] = precedence[SHEQ] = precedence[SHNE] = 10;
+ precedence[LT] = precedence[LE] = precedence[GT] = precedence[GE] = 11;
+ precedence[LSH] = precedence[RSH] = precedence[URSH] = 12;
+ precedence[ADD] = precedence[SUB] = 12;
+ precedence[MUL] = precedence[DIV] = precedence[MOD] = 13;
+ precedence[BITNOT] = precedence[BANG] = precedence[TYPEOF] = 14;
+ precedence[DOT] = precedence[LB] = precedence[LP] = precedence[INC] = precedence[DEC] = 15;
}
// Parsing Logic /////////////////////////////////////////////////////////
- public void consume(int code) throws IOException {
- if (getToken() != code)
- throw new ParserException("expected " + codeToString[op] + ", got " + (op == -1 ? "EOL" : codeToString[op]));
+ /** gets a token and throws an exception if it is not <tt>code</tt> */
+ private void consume(int code) throws IOException {
+ if (getToken() != code) {
+ if(code == NAME) switch(op) {
+ case RETURN: case TYPEOF: case BREAK: case CONTINUE: case TRY: case THROW:
+ case ASSERT: case NULL: case TRUE: case FALSE: case IN: case IF: case ELSE:
+ case SWITCH: case CASE: case DEFAULT: case WHILE: case VAR: case WITH:
+ case CATCH: case FINALLY:
+ throw pe("Bad variable name; '" + codeToString[op].toLowerCase() + "' is a javascript keyword");
+ }
+ throw pe("expected " + codeToString[code] + ", got " + (op == -1 ? "EOF" : codeToString[op]));
+ }
}
- /** parses the largest possible expression */
- public Expr parseMaximalExpr() throws IOException { return parseMaximalExpr(null, -1); }
- public Expr parseMaximalExpr(Expr prefix, int minPrecedence) throws IOException {
- while(true) {
- if (peekToken() == -1) break;
- Expr save = prefix;
- prefix = parseSingleExpr(prefix, minPrecedence);
- if (save == prefix) break;
- if (prefix == null) throw new ParserException("parseSingleExpr() returned null");
- }
- return prefix;
+ /**
+ * Parse the largest possible expression containing no operators
+ * of precedence below <tt>minPrecedence</tt> and append the
+ * bytecodes for that expression to <tt>appendTo</tt>; the
+ * appended bytecodes MUST grow the stack by exactly one element.
+ */
+ private void startExpr(JSFunction appendTo, int minPrecedence) throws IOException {
+ int saveParserLine = parserLine;
+ _startExpr(appendTo, minPrecedence);
+ parserLine = saveParserLine;
+ }
+ private void _startExpr(JSFunction appendTo, int minPrecedence) throws IOException {
+ int tok = getToken();
+ JSFunction b = appendTo;
+
+ switch (tok) {
+ case -1: throw pe("expected expression");
+
+ // all of these simply push values onto the stack
+ case NUMBER: b.add(parserLine, LITERAL, number); break;
+ case STRING: b.add(parserLine, LITERAL, string); break;
+ case NULL: b.add(parserLine, LITERAL, null); break;
+ case TRUE: case FALSE: b.add(parserLine, LITERAL, JS.B(tok == TRUE)); break;
+
+ // (.foo) syntax
+ case DOT: {
+ consume(NAME);
+ b.add(parserLine, TOPSCOPE);
+ b.add(parserLine, LITERAL, "");
+ b.add(parserLine, GET);
+ b.add(parserLine, LITERAL, string);
+ b.add(parserLine, GET);
+ continueExpr(b, minPrecedence);
+ break;
+ }
+
+ case LB: {
+ b.add(parserLine, ARRAY, JS.ZERO); // push an array onto the stack
+ int size0 = b.size;
+ int i = 0;
+ if (peekToken() != RB)
+ while(true) { // iterate over the initialization values
+ int size = b.size;
+ b.add(parserLine, LITERAL, JS.N(i++)); // push the index in the array to place it into
+ if (peekToken() == COMMA || peekToken() == RB)
+ b.add(parserLine, LITERAL, null); // for stuff like [1,,2,]
+ else
+ startExpr(b, NO_COMMA); // push the value onto the stack
+ b.add(parserLine, PUT); // put it into the array
+ b.add(parserLine, POP); // discard the value remaining on the stack
+ if (peekToken() == RB) break;
+ consume(COMMA);
+ }
+ b.set(size0 - 1, JS.N(i)); // back at the ARRAY instruction, write the size of the array
+ consume(RB);
+ break;
+ }
+ case SUB: { // negative literal (like "3 * -1")
+ consume(NUMBER);
+ b.add(parserLine, LITERAL, JS.N(number.doubleValue() * -1));
+ break;
+ }
+ case LP: { // grouping (not calling)
+ startExpr(b, -1);
+ consume(RP);
+ break;
+ }
+ case INC: case DEC: { // prefix (not postfix)
+ startExpr(b, precedence[tok]);
+ int prev = b.size - 1;
+ if (b.get(prev) == GET && b.getArg(prev) != null)
+ b.set(prev, LITERAL, b.getArg(prev));
+ else if(b.get(prev) == GET)
+ b.pop();
+ else
+ throw pe("prefixed increment/decrement can only be performed on a valid assignment target");
+ b.add(parserLine, GET_PRESERVE, Boolean.TRUE);
+ b.add(parserLine, LITERAL, JS.N(1));
+ b.add(parserLine, tok == INC ? ADD : SUB, JS.N(2));
+ b.add(parserLine, PUT, null);
+ b.add(parserLine, SWAP, null);
+ b.add(parserLine, POP, null);
+ break;
+ }
+ case BANG: case BITNOT: case TYPEOF: {
+ startExpr(b, precedence[tok]);
+ b.add(parserLine, tok);
+ break;
+ }
+ case LC: { // object constructor
+ b.add(parserLine, OBJECT, null); // put an object on the stack
+ if (peekToken() != RC)
+ while(true) {
+ if (peekToken() != NAME && peekToken() != STRING)
+ throw pe("expected NAME or STRING");
+ getToken();
+ b.add(parserLine, LITERAL, string); // grab the key
+ consume(COLON);
+ startExpr(b, NO_COMMA); // grab the value
+ b.add(parserLine, PUT); // put the value into the object
+ b.add(parserLine, POP); // discard the remaining value
+ if (peekToken() == RC) break;
+ consume(COMMA);
+ if (peekToken() == RC) break; // we permit {,,} -- I'm not sure if ECMA does
+ }
+ consume(RC);
+ break;
+ }
+ case NAME: {
+ b.add(parserLine, TOPSCOPE);
+ b.add(parserLine, LITERAL, string);
+ continueExprAfterAssignable(b,minPrecedence);
+ break;
+ }
+ case FUNCTION: {
+ consume(LP);
+ int numArgs = 0;
+ JSFunction b2 = new JSFunction(sourceName, parserLine, null);
+ b.add(parserLine, NEWFUNCTION, b2);
+
+ // function prelude; arguments array is already on the stack
+ b2.add(parserLine, TOPSCOPE);
+ b2.add(parserLine, SWAP);
+ b2.add(parserLine, DECLARE, "arguments"); // declare arguments (equivalent to 'var arguments;')
+ b2.add(parserLine, SWAP); // set this.arguments and leave the value on the stack
+ b2.add(parserLine, PUT);
+
+ while(peekToken() != RP) { // run through the list of argument names
+ numArgs++;
+ if (peekToken() == NAME) {
+ consume(NAME); // a named argument
+ String varName = string;
+
+ b2.add(parserLine, DUP); // dup the args array
+ b2.add(parserLine, GET, JS.N(numArgs - 1)); // retrieve it from the arguments array
+ b2.add(parserLine, TOPSCOPE);
+ b2.add(parserLine, SWAP);
+ b2.add(parserLine, DECLARE, varName); // declare the name
+ b2.add(parserLine, SWAP);
+ b2.add(parserLine, PUT);
+ b2.add(parserLine, POP); // pop the value
+ b2.add(parserLine, POP); // pop the scope
+ }
+ if (peekToken() == RP) break;
+ consume(COMMA);
+ }
+ consume(RP);
+
+ b2.numFormalArgs = numArgs;
+ b2.add(parserLine, POP); // pop off the arguments array
+ b2.add(parserLine, POP); // pop off TOPSCOPE
+
+ if(peekToken() != LC)
+ throw pe("JSFunctions must have a block surrounded by curly brackets");
+
+ parseBlock(b2, null); // the function body
+
+ b2.add(parserLine, LITERAL, null); // in case we "fall out the bottom", return NULL
+ b2.add(parserLine, RETURN);
+
+ break;
+ }
+ default: throw pe("expected expression, found " + codeToString[tok] + ", which cannot start an expression");
+ }
+
+ // attempt to continue the expression
+ continueExpr(b, minPrecedence);
}
- public Expr parseSingleExpr(Expr prefix, int minPrecedence) throws IOException {
- Expr e1 = null, e2 = null, e3 = null, head = null, tail = null, ret = null;
-
- int tok = peekToken();
- if (minPrecedence > 0 &&
- tok < precedence.length &&
- precedence[tok] != 0 &&
- (isRightAssociative[tok] ?
- (precedence[tok] < minPrecedence) :
- (precedence[tok] <= minPrecedence))) {
- return prefix;
- }
- getToken();
- int curLine = line;
-
- // these case arms match the precedence of operators; each arm is a precedence level.
- switch (tok) {
-
- case VAR: {
- if (prefix != null) { pushBackToken(); return prefix; }
- ByteCode b = new ByteCode(curLine);
- b.add(b.THIS, NO_ARG);
- while(true) {
- consume(NAME);
- String name = string;
- b.add(b.DECLARE, name);
- if (peekToken() == ASSIGN) {
- b.add(b.LITERAL, name);
- consume(ASSIGN);
- b.add(b.EXPR, parseMaximalExpr());
- b.add(b.PUT, NO_ARG);
- b.add(b.POP, NO_ARG);
- }
- if (peekToken() != COMMA) break;
- consume(COMMA);
- }
- return b;
- }
-
- case IN: pushBackToken(); return prefix;
-
- case IF: {
- if (prefix != null) { pushBackToken(); return prefix; }
- ByteCode b = new ByteCode(curLine);
- consume(LP);
- b.add(b.EXPR, parseMaximalExpr());
- consume(RP);
- b.add(b.JF, new Integer(3));
- b.add(b.EXPR, parseBlock(false));
- b.add(b.JMP, new Integer(2));
- if (peekToken() != ELSE) return b.add(b.LITERAL, null);
- consume(ELSE);
- b.add(b.EXPR, parseBlock(false));
- return b;
- }
-
- // FIXME: ugly hack!!
- case ASSIGN_BITOR: if (tok == ASSIGN_BITOR) tok = BITOR;
- case ASSIGN_BITXOR: if (tok == ASSIGN_BITXOR) tok = BITXOR;
- case ASSIGN_BITAND: if (tok == ASSIGN_BITAND) tok = BITAND;
- case ASSIGN_LSH: if (tok == ASSIGN_LSH) tok = LSH;
- case ASSIGN_RSH: if (tok == ASSIGN_RSH) tok = RSH;
- case ASSIGN_URSH: if (tok == ASSIGN_URSH) tok = URSH;
- case ASSIGN_ADD: if (tok == ASSIGN_ADD) tok = ADD;
- case ASSIGN_SUB: if (tok == ASSIGN_SUB) tok = SUB;
- case ASSIGN_MUL: if (tok == ASSIGN_MUL) tok = MUL;
- case ASSIGN_DIV: if (tok == ASSIGN_DIV) tok = DIV;
- case ASSIGN_MOD: if (tok == ASSIGN_MOD) tok = MOD;
- {
- ByteCode b = (ByteCode)prefix;
- b.set(b.size() - 1, b.GET_PRESERVE, new Boolean(true));
- b.add(b.EXPR, parseMaximalExpr(null, precedence[tok]));
- b.add(tok, NO_ARG);
- b.add(b.PUT, NO_ARG);
- b.add(b.SWAP, NO_ARG);
- b.add(b.POP, NO_ARG);
- return b;
- }
-
- case INC: case DEC:
- if (prefix == null) {
- // prefix
- ByteCode b = (ByteCode)parseMaximalExpr(null, precedence[tok]);
- b.set(b.size() - 1, tok, new Boolean(true));
- return b;
- } else {
- // postfix
- ByteCode b = (ByteCode)prefix;
- b.set(b.size() - 1, tok, new Boolean(false));
- return b;
- }
-
- case LP:
- if (prefix == null) { // grouping
- ByteCode b = new ByteCode(curLine, ByteCode.EXPR, parseMaximalExpr());
- consume(RP);
- return b;
- } else { // invocation
- ByteCode b = new ByteCode(curLine);
- int i = 0;
- b.add(b.EXPR, prefix);
- while(peekToken() != RP) {
- b.add(b.EXPR, parseMaximalExpr());
- i++;
- if (peekToken() == RP) break;
- consume(COMMA);
- }
- consume(RP);
- b.add(b.CALL, new Integer(i));
- return b;
- }
+ /**
+ * Assuming that a complete assignable (lvalue) has just been
+ * parsed and the object and key are on the stack,
+ * <tt>continueExprAfterAssignable</tt> will attempt to parse an
+ * expression that modifies the assignable. This method always
+ * decreases the stack depth by exactly one element.
+ */
+ private void continueExprAfterAssignable(JSFunction b,int minPrecedence) throws IOException {
+ int saveParserLine = parserLine;
+ _continueExprAfterAssignable(b,minPrecedence);
+ parserLine = saveParserLine;
+ }
+ private void _continueExprAfterAssignable(JSFunction b,int minPrecedence) throws IOException {
+ if (b == null) throw new Error("got null b; this should never happen");
+ int tok = getToken();
+ if (minPrecedence != -1 && (precedence[tok] < minPrecedence || (precedence[tok] == minPrecedence && !isRightAssociative[tok])))
+ // force the default case
+ tok = -1;
+ switch(tok) {
+ case ASSIGN_BITOR: case ASSIGN_BITXOR: case ASSIGN_BITAND: case ASSIGN_LSH: case ASSIGN_RSH: case ASSIGN_URSH:
+ case ASSIGN_MUL: case ASSIGN_DIV: case ASSIGN_MOD: case ASSIGN_ADD: case ASSIGN_SUB: {
+ b.add(parserLine, GET_PRESERVE);
+ startExpr(b, precedence[tok]);
+ int size = b.size;
+ if (tok == ASSIGN_ADD || tok == ASSIGN_SUB) {
+ b.add(parserLine, tok);
+ }
+ // tok-1 is always s/^ASSIGN_// (0 is BITOR, 1 is ASSIGN_BITOR, etc)
+ b.add(parserLine, tok - 1, tok-1==ADD ? JS.N(2) : null);
+ b.add(parserLine, PUT);
+ b.add(parserLine, SWAP);
+ b.add(parserLine, POP);
+ if (tok == ASSIGN_ADD || tok == ASSIGN_SUB) b.set(size, tok, JS.N(b.size - size));
+ break;
+ }
+ case INC: case DEC: { // postfix
+ b.add(parserLine, GET_PRESERVE, Boolean.TRUE);
+ b.add(parserLine, LITERAL, JS.N(1));
+ b.add(parserLine, tok == INC ? ADD : SUB, JS.N(2));
+ b.add(parserLine, PUT, null);
+ b.add(parserLine, SWAP, null);
+ b.add(parserLine, POP, null);
+ b.add(parserLine, LITERAL, JS.N(1));
+ b.add(parserLine, tok == INC ? SUB : ADD, null); // undo what we just did, since this is postfix
+ break;
+ }
+ case ASSIGN: {
+ startExpr(b, precedence[tok]);
+ b.add(parserLine, PUT);
+ b.add(parserLine, SWAP);
+ b.add(parserLine, POP);
+ break;
+ }
+ case LP: {
+
+ // Method calls are implemented by doing a GET_PRESERVE
+ // first. If the object supports method calls, it will
+ // return JS.METHOD
+ int n = parseArgs(b, 2);
+ b.add(parserLine, GET_PRESERVE);
+ b.add(parserLine, CALLMETHOD, JS.N(n));
+ break;
+ }
+ default: {
+ pushBackToken();
+ if(b.get(b.size-1) == LITERAL && b.getArg(b.size-1) != null)
+ b.set(b.size-1,GET,b.getArg(b.size-1));
+ else
+ b.add(parserLine, GET);
+ return;
+ }
+ }
+ }
- case BANG: case BITNOT: case INSTANCEOF: case TYPEOF: {
- if (prefix != null) { pushBackToken(); return prefix; }
- ByteCode b = new ByteCode(curLine);
- b.add(b.EXPR, parseMaximalExpr(null, precedence[tok]));
- b.add(tok, NO_ARG);
- return b;
- }
- case SUB:
- if (prefix == null && peekToken() == NUMBER) {
- getToken();
- return new ByteCode(curLine, ByteCode.LITERAL, new Double(number.doubleValue() * -1));
- } // else fall through
+ /**
+ * Assuming that a complete expression has just been parsed,
+ * <tt>continueExpr</tt> will attempt to extend this expression by
+ * parsing additional tokens and appending additional bytecodes.
+ *
+ * No operators with precedence less than <tt>minPrecedence</tt>
+ * will be parsed.
+ *
+ * If any bytecodes are appended, they will not alter the stack
+ * depth.
+ */
+ private void continueExpr(JSFunction b, int minPrecedence) throws IOException {
+ int saveParserLine = parserLine;
+ _continueExpr(b, minPrecedence);
+ parserLine = saveParserLine;
+ }
+ private void _continueExpr(JSFunction b, int minPrecedence) throws IOException {
+ if (b == null) throw new Error("got null b; this should never happen");
+ int tok = getToken();
+ if (tok == -1) return;
+ if (minPrecedence != -1 && (precedence[tok] < minPrecedence || (precedence[tok] == minPrecedence && !isRightAssociative[tok]))) {
+ pushBackToken();
+ return;
+ }
+
+ switch (tok) {
+ case LP: { // invocation (not grouping)
+ int n = parseArgs(b, 1);
+ b.add(parserLine, CALL, JS.N(n));
+ break;
+ }
case BITOR: case BITXOR: case BITAND: case SHEQ: case SHNE: case LSH:
- case RSH: case URSH: case ADD: case MUL: case DIV: case MOD:
- case GT: case GE: case EQ: case NE: case LT: case LE: {
- if (prefix == null) throw new ParserException("the " + codeToString[tok] + " token cannot start an expression");
- ByteCode b = new ByteCode(curLine);
- b.add(b.EXPR, prefix);
- b.add(b.EXPR, parseMaximalExpr(null, precedence[tok]));
- b.add(tok, NO_ARG);
- return b;
- }
-
- // includes short-circuit logic
- case OR: case AND: {
- if (prefix == null) throw new ParserException("the " + codeToString[tok] + " token cannot start an expression");
- ByteCode b = new ByteCode(curLine);
- b.add(b.LITERAL, tok == AND ? new Boolean(false) : new Boolean(true));
- b.add(b.EXPR, prefix);
- b.add(tok == AND ? b.JF : b.JT, new Integer(3));
- b.add(b.POP, NO_ARG);
- b.add(b.EXPR, parseMaximalExpr(null, precedence[tok]));
- return b;
- }
-
- case ASSIGN: {
- if (prefix == null) throw new ParserException("the " + codeToString[tok] + " token cannot start an expression");
- ByteCode b = new ByteCode(curLine);
- b.add(b.THIS, NO_ARG);
- b.add(b.LITERAL, prefix.string); // FIXME, this is ass-ugly
- b.add(b.EXPR, parseMaximalExpr(null, precedence[ASSIGN]));
- b.add(b.PUT, NO_ARG);
- b.add(b.SWAP, NO_ARG);
- b.add(b.POP, NO_ARG);
- return b;
- }
-
- case WITH: throw new ParserException("XWT does not allow the WITH keyword");
- case VOID: case RESERVED: throw new ParserException("reserved word that you shouldn't be using");
-
- case NUMBER:
- if (prefix != null) { pushBackToken(); return prefix; }
- return new ByteCode(curLine, ByteCode.LITERAL, number);
-
- case STRING:
- if (prefix != null) { pushBackToken(); return prefix; }
- return new ByteCode(curLine, ByteCode.LITERAL, string);
-
- case NULL: case TRUE: case FALSE: case NOP:
- if (prefix != null) { pushBackToken(); return prefix; }
- return new ByteCode(curLine, ByteCode.LITERAL, (tok == NULL || tok == NOP) ? null : new Boolean(tok == TRUE));
-
- case COMMA: pushBackToken(); return prefix;
-
- case THIS:
- if (prefix != null) { pushBackToken(); return prefix; }
- return new ByteCode(curLine, ByteCode.THIS, NO_ARG);
-
- // potential lvalues
-
- case NAME: {
- if (prefix != null) { pushBackToken(); return prefix; }
- String name = string;
- ByteCode b = new ByteCode(curLine);
- if (peekToken() == ASSIGN) {
- consume(ASSIGN);
- b.add(ByteCode.THIS, NO_ARG);
- b.add(ByteCode.LITERAL, name);
- b.add(ByteCode.EXPR, parseMaximalExpr(null, minPrecedence));
- b.add(ByteCode.PUT, NO_ARG);
- b.add(ByteCode.SWAP, NO_ARG);
- b.add(ByteCode.POP, NO_ARG);
- return b;
- } else {
- b.add(ByteCode.THIS, NO_ARG);
- b.add(ByteCode.LITERAL, name);
- b.add(ByteCode.GET, NO_ARG);
- return parseMaximalExpr(b, minPrecedence);
- }
- }
-
- case DOT: {
- consume(NAME);
- String target = string;
- ByteCode b = new ByteCode(curLine);
- b.add(b.EXPR, prefix);
- if (peekToken() == ASSIGN) {
- consume(ASSIGN);
- Expr val = parseMaximalExpr();
- b.add(b.LITERAL, target);
- b.add(b.EXPR, val);
- b.add(b.PUT, NO_ARG);
- b.add(b.SWAP, NO_ARG);
- b.add(b.POP, NO_ARG);
- } else {
- b.add(b.LITERAL, target);
- b.add(b.GET, NO_ARG);
- }
- return b;
- }
-
- case LB: {
- ByteCode b = new ByteCode(curLine);
- if (prefix == null) {
- b.add(b.ARRAY, new Integer(0));
- int i = 0;
- while(true) {
- Expr e = parseMaximalExpr();
- if (e == null && peekToken() == RB) { consume(RB); return b; }
- b.add(b.LITERAL, new Integer(i++));
- if (e == null) b.add(b.LITERAL, null);
- else b.add(b.EXPR, e);
- b.add(b.PUT, NO_ARG);
- b.add(b.POP, NO_ARG);
- if (peekToken() == RB) { consume(RB); return b; }
- consume(COMMA);
- }
- } else {
- b.add(b.EXPR, prefix);
- b.add(b.EXPR, parseMaximalExpr());
- consume(RB);
- if (peekToken() == ASSIGN) {
- consume(ASSIGN);
- b.add(b.EXPR, parseMaximalExpr());
- b.add(b.PUT, NO_ARG);
- b.add(b.SWAP, NO_ARG);
- b.add(b.POP, NO_ARG);
- } else {
- b.add(b.GET, NO_ARG);
- }
- return b;
- }
- }
-
- case LC: {
- if (prefix != null) { pushBackToken(); return prefix; }
- ByteCode b = new ByteCode(curLine);
- b.add(b.OBJECT, null);
- if (peekToken() == RC) { consume(RC); return b; }
- while(true) {
- if (peekToken() != NAME && peekToken() != STRING) throw new Error("expected NAME or STRING");
- getToken();
- b.add(b.LITERAL, string);
- consume(COLON);
- b.add(b.EXPR, parseMaximalExpr());
- b.add(b.PUT, NO_ARG);
- b.add(b.POP, NO_ARG);
- if (peekToken() == RC) { consume(RC); return b; }
- consume(COMMA);
- if (peekToken() == RC) { consume(RC); return b; }
- }
- }
-
- case HOOK: {
- ByteCode b = new ByteCode(curLine);
- b.add(b.EXPR, prefix);
- b.add(b.JF, new Integer(3));
- b.add(b.EXPR, parseMaximalExpr());
- b.add(b.JMP, new Integer(2));
- consume(COLON);
- b.add(b.EXPR, parseMaximalExpr());
- return b;
- }
-
- case FUNCTION: {
- if (prefix != null) { pushBackToken(); return prefix; }
- consume(LP);
- ByteCode b = new ByteCode(curLine);
- int numArgs = 0;
- b.add(b.THIS, NO_ARG);
- b.add(b.SWAP, NO_ARG);
- b.add(b.LITERAL, "arguments");
- b.add(b.LITERAL, "arguments");
- b.add(b.DECLARE, NO_ARG);
- b.add(b.SWAP, NO_ARG);
- b.add(b.PUT, NO_ARG);
- b.add(b.SWAP, NO_ARG);
- b.add(b.POP, NO_ARG);
- if (peekToken() == RP) consume(RP);
- else while(true) {
- if (peekToken() == COMMA) {
- consume(COMMA);
- } else {
- consume(NAME);
-
- // declare the name
- b.add(b.LITERAL, string);
- b.add(b.DECLARE, NO_ARG);
-
- // retrieve it from the arguments array
- b.add(b.LITERAL, new Integer(numArgs));
- b.add(b.GET_PRESERVE, NO_ARG);
- b.add(b.SWAP, NO_ARG);
- b.add(b.POP, NO_ARG);
-
- // put it to the current scope
- b.add(b.THIS, NO_ARG);
- b.add(b.SWAP, NO_ARG);
- b.add(b.LITERAL, string);
- b.add(b.SWAP, NO_ARG);
- b.add(b.PUT, NO_ARG);
-
- // clean the stack
- b.add(b.POP, NO_ARG);
- b.add(b.POP, NO_ARG);
-
- if (peekToken() == RP) { consume(RP); break; }
- consume(COMMA);
- }
- numArgs++;
- }
- // pop off the arguments array
- b.add(b.POP, NO_ARG);
- parseBlock(true, b);
- return new ByteCode(curLine, b.FUNCTION, b);
- }
-
- case WHILE: {
- if (prefix != null) { pushBackToken(); return prefix; }
- consume(LP);
- ByteCode r = new ByteCode(curLine);
- ByteCode loop = new ByteCode(curLine);
- r.add(loop.LOOP, loop);
- r.add(r.LITERAL, null);
-
- loop.add(loop.EXPR, parseMaximalExpr());
- loop.add(loop.JT, new Integer(2));
- loop.add(Lexer.BREAK, NO_ARG);
- consume(RP);
- parseBlock(false, loop);
-
- // if we fall out of the end, definately continue
- loop.add(CONTINUE, NO_ARG);
- return r;
- }
-
- case SWITCH: {
- if (prefix != null) { pushBackToken(); return prefix; }
- consume(LP);
- ByteCode r = new ByteCode(curLine);
- ByteCode loop = new ByteCode(curLine);
- r.add(loop.LOOP, loop);
- r.add(r.LITERAL, null);
- loop.add(loop.EXPR, parseMaximalExpr());
- consume(RP);
- consume(LC);
- while(true) {
- Expr caseExpr;
- tok = getToken();
- if (tok == CASE) {
- loop.add(loop.DUP, NO_ARG);
- loop.add(loop.EXPR, parseMaximalExpr());
- loop.add(EQ, NO_ARG);
- loop.add(loop.JF, new Integer(2));
- } else if (tok != DEFAULT) throw new ParserException("expected CASE or DEFAULT");
- consume(COLON);
- ByteCode b = new ByteCode(curLine);
- while(peekToken() != CASE && peekToken() != DEFAULT && peekToken() != RC) {
- if ((e1 = parseBlock(false)) == null) break;
- b.add(b.EXPR, e1);
- }
- loop.add(loop.EXPR, b);
- if (peekToken() == RC) {
- consume(RC);
- r.add(BREAK, NO_ARG);
- return r;
- }
- }
- }
-
- case DO: {
- if (prefix != null) { pushBackToken(); return prefix; }
- ByteCode r = new ByteCode(curLine);
- ByteCode loop = new ByteCode(curLine);
- r.add(loop.LOOP, loop);
- r.add(r.LITERAL, null);
-
- parseBlock(false, loop);
- consume(WHILE);
- consume(LP);
- loop.add(loop.EXPR, parseMaximalExpr());
- loop.add(loop.JT, new Integer(2));
- loop.add(Lexer.BREAK, NO_ARG);
- loop.add(Lexer.CONTINUE, NO_ARG);
- consume(RP);
- consume(SEMI);
- return r;
- }
-
- // Needs break //
-
- case FOR:
- if (prefix != null) { pushBackToken(); return prefix; }
- if (getToken() != LP) throw new ParserException("expected left paren");
- e1 = parseMaximalExpr();
- if (peekToken() == IN) {
- getToken();
- e2 = parseMaximalExpr();
- if (getToken() != RP) throw new ParserException("expected right paren");
- return new Expr(curLine, FOR, new Expr(curLine, IN, e1.left, e2), parseBlock(false));
-
- } else {
- Expr initExpr = e1;
- if (initExpr == null) initExpr = new Expr(curLine, NULL);
- consume(SEMI);
- Expr whileExpr = parseMaximalExpr();
- consume(SEMI);
- Expr incExpr = parseMaximalExpr();
- consume(RP);
- Expr body = parseBlock(false);
- Expr loop = new Expr(curLine, WHILE, whileExpr, body);
- ExprList list = new ExprList(curLine, LC);
- list.add(initExpr);
- ExprList list2 = new ExprList(curLine, WHILE);
- list.add(list2);
- list2.add(whileExpr);
- list2.add(body);
- list2.add(incExpr);
- return list;
- }
-
- case TRY: {
- // We deliberately allow you to omit braces in catch{}/finally{} if they are single statements...
- if (prefix != null) { pushBackToken(); return prefix; }
- Expr tryBlock = parseBlock(true);
-
- tok = peekToken();
- ExprList list = new ExprList(curLine, TRY);
- if (tok == CATCH) {
- getToken();
- if (getToken() != LP) throw new ParserException("expected (");
- if (getToken() != NAME) throw new ParserException("expected name");
- Expr name = new Expr(curLine, NAME, string);
- if (getToken() != RP) throw new ParserException("expected )");
- list.add(new Expr(curLine, CATCH, name, parseBlock(false)));
- tok = peekToken();
- }
- if (tok == FINALLY) {
- getToken();
- list.add(new Expr(curLine, FINALLY, parseBlock(false)));
- }
-
- if (list.size() == 0) throw new ParserException("try without catch or finally");
- return new Expr(curLine, TRY, tryBlock, list);
- }
-
- default:
- pushBackToken();
- return prefix;
- }
+ case RSH: case URSH: case MUL: case DIV: case MOD:
+ case GT: case GE: case EQ: case NE: case LT: case LE: case SUB: {
+ startExpr(b, precedence[tok]);
+ b.add(parserLine, tok);
+ break;
+ }
+ case ADD: {
+ int count=1;
+ int nextTok;
+ do {
+ startExpr(b,precedence[tok]);
+ count++;
+ nextTok = getToken();
+ } while(nextTok == tok);
+ pushBackToken();
+ b.add(parserLine, tok, JS.N(count));
+ break;
+ }
+ case OR: case AND: {
+ b.add(parserLine, tok == AND ? b.JF : b.JT, JS.ZERO); // test to see if we can short-circuit
+ int size = b.size;
+ startExpr(b, precedence[tok]); // otherwise check the second value
+ b.add(parserLine, JMP, JS.N(2)); // leave the second value on the stack and jump to the end
+ b.add(parserLine, LITERAL, tok == AND ?
+ JS.B(false) : JS.B(true)); // target of the short-circuit jump is here
+ b.set(size - 1, JS.N(b.size - size)); // write the target of the short-circuit jump
+ break;
+ }
+ case DOT: {
+ // support foo..bar syntax for foo[""].bar
+ if (peekToken() == DOT) {
+ string = "";
+ } else {
+ consume(NAME);
+ }
+ b.add(parserLine, LITERAL, string);
+ continueExprAfterAssignable(b,minPrecedence);
+ break;
+ }
+ case LB: { // subscripting (not array constructor)
+ startExpr(b, -1);
+ consume(RB);
+ continueExprAfterAssignable(b,minPrecedence);
+ break;
+ }
+ case HOOK: {
+ b.add(parserLine, JF, JS.ZERO); // jump to the if-false expression
+ int size = b.size;
+ startExpr(b, minPrecedence); // write the if-true expression
+ b.add(parserLine, JMP, JS.ZERO); // if true, jump *over* the if-false expression
+ b.set(size - 1, JS.N(b.size - size + 1)); // now we know where the target of the jump is
+ consume(COLON);
+ size = b.size;
+ startExpr(b, minPrecedence); // write the if-false expression
+ b.set(size - 1, JS.N(b.size - size + 1)); // this is the end; jump to here
+ break;
+ }
+ case COMMA: {
+ // pop the result of the previous expression, it is ignored
+ b.add(parserLine,POP);
+ startExpr(b,-1);
+ break;
+ }
+ default: {
+ pushBackToken();
+ return;
+ }
+ }
+
+ continueExpr(b, minPrecedence); // try to continue the expression
}
- // Expr //////////////////////////////////////////////////////////////////////
-
- public static final Object NO_ARG = new Object();
-
- class ByteCode extends Expr {
-
- // This class interprets a small forthlike bytecode language
- // we use to represent JavaScript. It's a stack machine.
-
- // Each instruction is an opcode and a literal. Any operation
- // that accesses the top of the stack and does not have a
- // mandatory literal can be performed on a literal instead of
- // the top of the stack.
-
- // opcodes:
- public static final byte arithmetic = -1; // -- arithmetic operators from parser
- public static final byte LITERAL = -2; // < String | Number | null > -- push a literal onto the stack
- public static final byte ARRAY = -3; // < size > -- create a new array of size <size>
- public static final byte OBJECT = -4; // -- push an empty object onto the stack
- public static final byte FUNCTION = -5; // < bytecode_block > -- push a new instance of a function with the given bytecode
- public static final byte DECLARE = -6; // < name > -- declare <name> in the current scope
- public static final byte THIS = -7; // -- push the topmost non-transparent scope onto the stack
- public static final byte GET = -8; // -- get stack[0] from stack[1]
- public static final byte GET_PRESERVE = -80; // -- get stack[0] from stack[1]
- public static final byte PUT = -9; // -- put stack[1] to key stack[0] on stack[2]; leaves object on the stack
- public static final byte THROW = -10; // -- throw topmost element
- public static final byte RETURN = -11; // -- return the topmost value on the stack
- public static final byte ASSERT = -12; // -- fail if topmost element is not true
- public static final byte JT = -13; // < relative_address > -- pop the stack; if true, jump to <relative_address>
- public static final byte JF = -21; // < relative_address > -- pop the stack; if false, jump to <relative_address>
- public static final byte JMP = -22; // < relative_address > -- jump to <relative_address>
- static public final byte POP = -14; // -- discard the top element on the stack
-
- public static final byte CALL = -15; // < numargs > -- call stack[0] with the topmost <numargs> values as arguments
- public static final byte TRY = -16; // < bytecode_block > -- run the block pointed to; returns with thrown exn on top of stack
-
- public static final byte INSTANCEOF = -17; // -- ??
- public static final byte TYPEOF = -18; // --
-
- public static final byte FOR__IN = -19; // -- ??
- public static final byte EXPR = -20; // -- transitional
- public static final byte SWAP = -23; // -- transitional
- public static final byte SCOPE = -30; // -- transitional
- public static final byte LOOP = -40; // -- transitional
- public static final byte DUP = -50; // -- transitional
-
- int[] op = new int[10];
- Object[] arg = new Object[10];
- int size = 0;
-
- public ByteCode(int line) { super(line, "foo"); }
- public ByteCode(int line, int op_, Object arg_) { this(line); add(op_, arg_); }
-
- public int size() { return size; }
- public void set(int pos, int op_, Object arg_) { op[pos] = op_; arg[pos] = arg_; }
- public ByteCode add(int op_, Object arg_) {
- if (size == op.length - 1) {
- int[] op2 = new int[op.length * 2]; System.arraycopy(op, 0, op2, 0, op.length); op = op2;
- Object[] arg2 = new Object[op.length * 2]; System.arraycopy(arg, 0, arg2, 0, arg.length); arg = arg2;
- }
- op[size] = op_;
- arg[size] = arg_;
- size++;
- return this;
- }
-
- public Object eval(final JS.Scope s) throws ControlTransferException, JS.Exn {
- return eval(s, new Parser.Thread());
- }
- public Object eval(final JS.Scope s, Parser.Thread t) throws ControlTransferException {
- for(int i=0; i<size; i++)
- switch(op[i]) {
- case arithmetic: break;
- case LITERAL:
- t.push(arg[i]);
- break;
- case OBJECT: t.push(new JS.Obj()); break;
- case ARRAY: t.push(new JS.Array(toNumber(arg[i]).intValue())); break;
- case DECLARE: s.declare(arg[i] == NO_ARG ? (String)t.pop() : (String)arg[i]); break;
- case THIS: t.push(s); break; // FIXME: transparents
- case ASSERT: if (!toBoolean(t.pop())) throw new EvaluatorException("assertion failed"); break;
- case THROW: throw new JS.Exn(t.pop());
- case JT: if (toBoolean(t.pop())) i += toNumber(arg[i]).intValue() - 1; break;
- case JF: if (!toBoolean(t.pop())) i += toNumber(arg[i]).intValue() - 1; break;
- case JMP: i += toNumber(arg[i]).intValue() - 1; break;
- case POP: t.pop(); break;
- case SWAP: t.swap(); break;
- case DUP: t.push(t.peek()); break;
-
- case Lexer.BREAK: {
- // FIXME: make sure this can only appear in proper places
- return Boolean.FALSE;
- }
- case Lexer.CONTINUE: {
- // FIXME: make sure this can only appear in proper places
- return Boolean.TRUE;
- }
- case LOOP: {
- ByteCode loop = (ByteCode)arg[i];
- Parser.Thread t2 = new Parser.Thread();
- t2.push(Boolean.TRUE);
- while (true) {
- Boolean result;
- try {
- result = (Boolean)loop.eval(new JS.Scope(s), t2);
- } catch (ContinueException c) {
- result = Boolean.TRUE;
- } catch (BreakException b) {
- result = Boolean.FALSE;
- }
- if (result == Boolean.FALSE) break;
- t2 = new Parser.Thread();
- t2.push(Boolean.FALSE);
- }
- break;
- }
-
- case PUT: {
- Object val = arg[i] == NO_ARG ? t.pop() : arg[i];
- Object key = t.pop();
- ((JS)t.peek()).put(key, val);
- t.push(val);
- break;
- }
-
- case GET: {
- Object v = arg[i] == NO_ARG ? t.pop() : arg[i];
- Object o = t.pop();
- t.push(doGet(o, v));
- break;
- }
- case GET_PRESERVE: {
- Object v = t.pop();
- Object o = t.peek();
- t.push(v);
- t.push(doGet(o, v));
- break;
- }
- case NOP: break;
-
- case EXPR: t.push(((Expr)arg[i]).eval(s)); break;
- case SCOPE: t.push(((Expr)arg[i]).eval(new JS.Scope(s))); break;
-
- case CALL:
- JS.Array arguments = new JS.Array();
- int numArgs = toNumber(arg[i]).intValue();
- arguments.setSize(numArgs);
- for(int j=numArgs - 1; j >= 0; j--) arguments.setElementAt(t.pop(), j);
- JS.Function f = (JS.Function)t.pop();
- if (f == null) throw new JS.Exn(new EvaluatorException("attempted to call null"));
- t.push(f.call(arguments));
- break;
-
- case FUNCTION: {
- final ByteCode myBytes = (ByteCode)arg[i];
- t.push(new JS.Function() {
- public String toString() { return sourceName + ":" + line; }
- public String getSourceName() throws JS.Exn { return sourceName; }
- public Object _call(final JS.Array args) throws JS.Exn {
- Function save = JS.getCurrentFunction();
- JS.currentFunction.put(java.lang.Thread.currentThread(), this);
- JS.Scope scope = new JS.Scope(s) {
- // FIXME
- public String getSourceName() { return sourceName; }
- public Object get(Object key) throws JS.Exn {
- if (key.equals("trapee")) return org.xwt.Trap.currentTrapee();
- else if (key.equals("cascade")) return org.xwt.Trap.cascadeFunction;
- return super.get(key);
- }
- };
- Parser.Thread t0 = new Parser.Thread();
- t0.push(args);
- try {
- return myBytes.eval(scope, t0);
- } catch (ReturnException r) {
- return r.retval;
- } catch (ControlTransferException c) {
- throw new EvaluatorException("error, ControlTransferException tried to leave a function: " + c);
- } finally {
- if (save == null) JS.currentFunction.remove(java.lang.Thread.currentThread());
- else JS.currentFunction.put(java.lang.Thread.currentThread(), save);
- }
- }
- });
- break;
- }
-
- case RETURN: break;
- case TRY: break;
- case INSTANCEOF: break;
- case TYPEOF: break;
- case FOR__IN: break;
-
- case Lexer.BITNOT: t.push(new Long(~toLong(t.pop()))); break;
- case Lexer.BANG: t.push(new Boolean(!toBoolean(t.pop()))); break;
-
- case Lexer.INC: case Lexer.DEC: {
- boolean isPrefix = toBoolean(arg[i]);
- Object key = t.pop();
- JS obj = (JS)t.pop();
- Number num = toNumber(obj.get(key));
- Number val = new Double(op[i] == Lexer.INC ? num.doubleValue() + 1.0 : num.doubleValue() - 1.0);
- obj.put(key, val);
- t.push(isPrefix ? val : num);
- break;
- }
-
- default: {
- Object right = t.pop();
- Object left = t.pop();
- switch(op[i]) {
-
- case Lexer.BITOR: t.push(new Long(toLong(left) | toLong(right))); break;
- case Lexer.BITXOR: t.push(new Long(toLong(left) ^ toLong(right))); break;
- case Lexer.BITAND: t.push(new Long(toLong(left) & toLong(right))); break;
-
- case Lexer.ADD: {
- Object l = left;
- Object r = right;
- if (l instanceof String || r instanceof String) {
- if (l == null) l = "null";
- if (r == null) r = "null";
- if (l instanceof Number && ((Number)l).doubleValue() == ((Number)l).longValue())
- l = new Long(((Number)l).longValue());
- if (r instanceof Number && ((Number)r).doubleValue() == ((Number)r).longValue())
- r = new Long(((Number)r).longValue());
- t.push(l.toString() + r.toString()); break;
- }
- t.push(new Double(toDouble(l) + toDouble(r))); break;
- }
-
- case Lexer.SUB: t.push(new Double(toDouble(left) - toDouble(right))); break;
- case Lexer.MUL: t.push(new Double(toDouble(left) * toDouble(right))); break;
- case Lexer.DIV: t.push(new Double(toDouble(left) / toDouble(right))); break;
- case Lexer.MOD: t.push(new Double(toDouble(left) % toDouble(right))); break;
-
- case Lexer.LSH: t.push(new Long(toLong(left) << toLong(right))); break;
- case Lexer.RSH: t.push(new Long(toLong(left) >> toLong(right))); break;
- case Lexer.URSH: t.push(new Long(toLong(left) >>> toLong(right))); break;
-
- // FIXME: these need to work on strings
- case Lexer.LT: t.push(toDouble(left) < toDouble(right) ? Boolean.TRUE : Boolean.FALSE); break;
- case Lexer.LE: t.push(toDouble(left) <= toDouble(right) ? Boolean.TRUE : Boolean.FALSE); break;
- case Lexer.GT: t.push(toDouble(left) > toDouble(right) ? Boolean.TRUE : Boolean.FALSE); break;
- case Lexer.GE: t.push(toDouble(left) >= toDouble(right) ? Boolean.TRUE : Boolean.FALSE); break;
-
- case Lexer.EQ:
- case Lexer.NE: {
- // FIXME: should use Javascript coercion-equality rules
- Object l = left;
- Object r = right;
- boolean ret;
- if (l == null) { Object tmp = r; r = l; l = tmp; }
- if (l == null && r == null) ret = true;
- else if (l instanceof Boolean) ret = new Boolean(toBoolean(r)).equals(l);
- else if (l instanceof Number) ret = toNumber(r).doubleValue() == toNumber(l).doubleValue();
- else if (l instanceof String) ret = r != null && l.equals(r.toString());
- else ret = l.equals(r);
- t.push(new Boolean(op[i] == Lexer.EQ ? ret : !ret)); break;
- }
-
- default: throw new Error("unknown opcode " + op[i]);
- } }
- }
- if (t.size() != 1) {
- throw new EvaluatorException("eval() terminated with " + t.size() + " elements on the stack; one expected");
- }
- return t.pop();
- }
-
- public Object doGet(final Object o, final Object v) {
- if (o == null) throw new EvaluatorException("tried to get property \"" + v + "\" from the null value");
- if (o instanceof String) {
- if (v.equals("length")) return new Integer(((String)o).length());
- else if (v.equals("substring")) return new JS.Function() {
- public Object _call(JS.Array args) {
- if (args.length() == 1) return ((String)o).substring(toNumber(args.elementAt(0)).intValue());
- else if (args.length() == 2) return ((String)o).substring(toNumber(args.elementAt(0)).intValue(),
- toNumber(args.elementAt(1)).intValue());
- else throw new Error("String.substring() can only take one or two arguments");
- }
- };
- else if (v.equals("toLowerCase")) return new JS.Function() {
- public Object _call(JS.Array args) {
- return ((String)o).toLowerCase();
- } };
- else if (v.equals("toUpperCase")) return new JS.Function() {
- public Object _call(JS.Array args) {
- return ((String)o).toString().toUpperCase();
- } };
- else if (v.equals("charAt")) return new JS.Function() {
- public Object _call(JS.Array args) {
- return ((String)o).charAt(toNumber(args.elementAt(0)).intValue()) + "";
- } };
- else if (v.equals("lastIndexOf")) return new JS.Function() {
- public Object _call(JS.Array args) {
- if (args.length() != 1) return null;
- return new Integer(((String)o).lastIndexOf(args.elementAt(0).toString()));
- } };
- else if (v.equals("indexOf")) return new JS.Function() {
- public Object _call(JS.Array args) {
- if (args.length() != 1) return null;
- return new Integer(((String)o).indexOf(args.elementAt(0).toString()));
- } };
- throw new Error("Not Implemented: propery " + v + " on String objects");
- } else if (o instanceof Boolean) {
- throw new Error("Not Implemented: properties on Boolean objects");
- } else if (o instanceof Number) {
- Log.log(this, "Not Implemented: properties on Number objects");
- return null;
- //throw new Error("Not Implemented: properties on Number objects");
- } else if (o instanceof JS) {
- return ((JS)o).get(v);
- }
- return null;
- }
+ // parse a set of comma separated function arguments, assume LP has already been consumed
+ // if swap is true, (because the function is already on the stack) we will SWAP after each argument to keep it on top
+ private int parseArgs(JSFunction b, int pushdown) throws IOException {
+ int i = 0;
+ while(peekToken() != RP) {
+ i++;
+ if (peekToken() != COMMA) {
+ startExpr(b, NO_COMMA);
+ b.add(parserLine, SWAP, JS.N(pushdown));
+ if (peekToken() == RP) break;
+ }
+ consume(COMMA);
+ }
+ consume(RP);
+ return i;
}
-
- class Thread {
- public Object[] os = new Object[256];
- private int size = 0;
- public void push(Object o) {
- os[size++] = o;
- }
- public Object pop() {
- return os[--size];
- }
- public Object peek() { return os[size - 1]; }
- public void swap() { Object temp = os[size - 1]; os[size - 1] = os[size - 2]; os[size - 2] = temp; }
- public int size() { return size; }
+
+ /** Parse a block of statements which must be surrounded by LC..RC. */
+ void parseBlock(JSFunction b) throws IOException { parseBlock(b, null); }
+ void parseBlock(JSFunction b, String label) throws IOException {
+ int saveParserLine = parserLine;
+ _parseBlock(b, label);
+ parserLine = saveParserLine;
}
-
- class ExprList extends Expr {
- Vec v = new Vec();
- public ExprList(int curLine, int code) { super(curLine, code); }
- public void add(Expr e) { v.addElement(e); }
- public int numExprs() { return v.size(); }
- public int size() { return v.size(); }
- public Expr elementAt(int i) { return (Expr)v.elementAt(i); }
- public Object eval(final JS.Scope s) throws ControlTransferException, JS.Exn {
- switch(code) {
- case LC: {
- // Block
- JS.Scope scope = new JS.Scope(s);
- for(int i=0; i<v.size(); i++) ((Expr)v.elementAt(i)).eval(scope);
- return null;
- }
- case Lexer.LB: {
- // Array ctor
- JS.Array ret = new JS.Array();
- for(int i=0; i<numExprs(); i++) ret.addElement(elementAt(i).eval(s));
- return ret;
- }
- case Lexer.RC: {
- // Object ctor
- JS.Obj ret = new JS.Obj();
- for(int i=0; i<numExprs(); i++) {
- Expr e = elementAt(i);
- Object key = e.left.string;
- Object val = e.right.eval(s);
- ret.put(key, val);
- }
- return ret;
- }
- case Lexer.WHILE:
- case Lexer.DO:
- try {
- boolean first = true;
- Object bogus = null;
- ExprList list = this;
- Expr whileExpr = list.elementAt(0);
- Expr bodyExpr = list.elementAt(1);
- Expr incExpr = list.elementAt(2);
- for(;(first && code == Lexer.DO) || toBoolean(whileExpr.eval(s)); bogus = incExpr.eval(s)) {
- first = false;
- try {
- bodyExpr.eval(s);
- } catch (ContinueException c) {
- if (c.label == null || c.label.equals(string)) continue;
- } catch (BreakException b) {
- if (b.label == null || b.label.equals(string)) return null;
- throw (BreakException)b.fillInStackTrace();
- }
- }
- } catch (BreakException e) {
- if (e.label != null && !e.label.equals(string)) throw e;
- }
- return null;
- case Lexer.VAR:
- for(int i=0; i<size(); i++) {
- Expr e = elementAt(i);
- s.declare(e.left.string);
- if (e.right != null) e.right.eval(s);
- }
- return null;
- default: throw new Error("augh!");
- }
- }
+ void _parseBlock(JSFunction b, String label) throws IOException {
+ if (peekToken() == -1) return;
+ else if (peekToken() != LC) parseStatement(b, null);
+ else {
+ consume(LC);
+ while(peekToken() != RC && peekToken() != -1) parseStatement(b, null);
+ consume(RC);
+ }
}
-
- /** a block is either a single statement or a list of statements surrounded by curly braces; all expressions are also statements */
- public Expr parseBlock(boolean requireBraces) throws IOException { return parseBlock(requireBraces, null); }
- public Expr parseBlock(boolean requireBraces, ByteCode b) throws IOException {
- Expr smt = null;
- int tok = peekToken();
- if (tok == -1) return null;
- boolean braced = tok == LC;
- if (requireBraces && !braced) throw new ParserException("expected {, got " + codeToString[tok]);
- if (braced) consume(LC);
- int curLine = line;
- ByteCode ret = new ByteCode(curLine);
- ByteCode block = b == null ? new ByteCode(curLine) : b;
- block.add(ret.LITERAL, Boolean.TRUE);
- ret.add(block.SCOPE, block);
- while(true) {
- switch(tok = peekToken()) {
-
- case LC:
- smt = parseBlock(true); break;
- case THROW: case RETURN: case ASSERT:
- getToken();
- if (peekToken() == SEMI) {
- if (tok == THROW || tok == ASSERT) throw new ParserException(codeToString[tok] + " requires an argument");
- consume(SEMI);
- smt = new Expr(curLine, tok);
- } else {
- smt = new Expr(curLine, tok, parseMaximalExpr());
- consume(SEMI);
- }
- break;
-
- case GOTO: case BREAK: case CONTINUE: {
- getToken();
- int t = peekToken();
- if (t == NAME) {
- getToken();
- smt = new Expr(curLine, tok, new Expr(curLine, string));
- } else if (tok == GOTO) {
- throw new ParserException("goto must be followed by a label");
- }
- smt = new Expr(curLine, tok, new Expr(curLine, string));
- consume(SEMI);
- break;
- }
-
- case RC:
- if (braced) consume(RC);
- return block.size() == 0 ? null : ret;
-
- case SEMI:
- consume(SEMI);
- if (!braced) return block.size() == 0 ? null : ret;
- continue;
-
- case NAME: {
- String name = string;
- consume(NAME);
- if (peekToken() == COLON) {
- consume(COLON);
- smt = new Expr(curLine, COLON, new Expr(curLine, name), parseBlock(false));
- break;
- } else {
- pushBackToken(NAME, name);
- // fall through to default case
- }
- }
-
- case -1:
- default:
- smt = parseMaximalExpr();
- if (smt == null) return block.size() == 0 ? null : ret;
- if (peekToken() == SEMI) getToken();
- break;
- }
-
- if (!braced) return smt;
- block.add(block.EXPR, smt);
- block.add(block.POP, NO_ARG);
- }
+ /** Parse a single statement, consuming the RC or SEMI which terminates it. */
+ void parseStatement(JSFunction b, String label) throws IOException {
+ int saveParserLine = parserLine;
+ _parseStatement(b, label);
+ parserLine = saveParserLine;
}
-
-
- /** sorta like gcc trees */
- class Expr {
- int code = -1;
-
- final Expr left;
- final Expr right;
- int line = -1;
- String sourceName = "unknown";
-
- String string = null;
- Number number = null;
-
- public String toString() { return toString(0); }
- public String toString(int indent) {
- String ret = "";
- for(int i=0; i<indent; i++) ret += " ";
- ret += Lexer.codeToString[code];
- if (code == Lexer.NUMBER) ret += " " + number;
- else if (string != null) ret += " \"" + string + "\"";
- ret += "\n";
- if (left != null) ret += left.toString(indent + 2);
- if (right != null) ret += right.toString(indent + 2);
- return ret;
- }
-
- public Expr(int line, String s) { this(line, Lexer.STRING); this.string = s; } // an identifier or label
- public Expr(int line, int code, String s) { this(line, code); this.string = s; }
- public Expr(int line, Number n) { this(line, Lexer.NUMBER); this.number = n; } // an identifier or label
- public Expr(int line, int code) { this(line, code, null, null); }
- public Expr(int line, int code, Expr left) { this(line, code, left, null); }
- public Expr(int line, int code, Expr left, Expr right) {
- this.code = code; this.left = left; this.right = right;
- this.line = line;
- this.sourceName = Parser.this.sourceName;
- }
-
- public double toDouble(Object o) { return toNumber(o).doubleValue(); }
- public long toLong(Object o) { return toNumber(o).longValue(); }
- public boolean toBoolean(Object o) {
- if (o == null) return false;
- if (o instanceof Boolean) return ((Boolean)o).booleanValue();
- if (o instanceof Number) return o.equals(new Integer(0));
- return true;
- }
-
- public Object eval(final JS.Scope s) throws ControlTransferException, JS.Exn {
- switch(code) {
-
- case Lexer.NULL: return null;
- case Lexer.TYPEOF: {
- Object o = left.eval(s);
- if (o == null) return "null";
- if (o.getClass() == String.class) return "string";
- if (o.getClass() == Boolean.class) return "boolean";
- if (o instanceof Number) return "number";
- if (o instanceof JS.Array) return "array";
- if (o instanceof JS) return "object";
- throw new EvaluatorException("typeof " + o.getClass().getName() + " unknown");
- }
-
- case Lexer.THROW: throw new JS.Exn(left.eval(s));
-
- case Lexer.TRY: {
- boolean safeToExit = false;
- try {
- Object ret = left.eval(s);
- safeToExit = true;
- return ret;
- } catch (JS.Exn e) {
- ExprList list = (ExprList)right;
- Expr c = list.elementAt(0);
- if (c.code == Lexer.CATCH) {
- JS.Scope scope = new JS.Scope(s);
- s.put(c.left.string, e);
- c.right.eval(scope);
- c = list.elementAt(1);
- }
- if (c.code == Lexer.FINALLY) {
- JS.Scope scope = new JS.Scope(s);
- c.left.eval(scope);
- }
- } finally {
- if (!safeToExit) Log.log(this, "WARNING: Java exception penetrated a JavaScript try{} block");
- }
- return null;
- }
-
- case Lexer.FOR:
- Object[] keys = ((JS)left.right.eval(s)).keys();
- for(int i=0; i<keys.length; i++) {
- JS.Scope scope = new JS.Scope(s);
- scope.declare(left.string);
- scope.put(left.string, keys[i]);
- try {
- right.eval(scope);
- } catch (ContinueException c) {
- if (c.label == null || c.label.equals(string)) continue;
- } catch (BreakException b) {
- if (b.label == null || b.label.equals(string)) return null;
- throw (BreakException)b.fillInStackTrace();
- }
- }
- return null;
-
- case Lexer.SWITCH:
- Object switchVal = left.eval(s);
- boolean go = false;
- try {
- ExprList list = (ExprList)right;
- for(int i=0; i<list.size(); i++) {
- Expr e = list.elementAt(i);
- if (go || e.code == Lexer.DEFAULT || e.left.eval(s).equals(switchVal)) go = true;
- if (go) e.right.eval(s);
- }
- } catch (BreakException b) {
- if (b.label == null || b.label.equals(string)) return null;
- throw (BreakException)b.fillInStackTrace();
- }
- return null;
-
- case Lexer.BREAK: throw new BreakException(string);
- case Lexer.CONTINUE: throw new ContinueException(string);
- case Lexer.RETURN: throw new ReturnException(left == null ? null : left.eval(s));
-
- default: throw new EvaluatorException("don't know how to eval an Expr with code " + Lexer.codeToString[code] + "\n" + this);
- }
- }
-
- class EvaluatorException extends RuntimeException {
- public EvaluatorException(String s) { super(sourceName + ":" + line + " " + s); }
- }
+ void _parseStatement(JSFunction b, String label) throws IOException {
+ int tok = peekToken();
+ if (tok == -1) return;
+ switch(tok = getToken()) {
+
+ case THROW: case ASSERT: case RETURN: {
+ if (tok == RETURN && peekToken() == SEMI)
+ b.add(parserLine, LITERAL, null);
+ else
+ startExpr(b, -1);
+ b.add(parserLine, tok);
+ consume(SEMI);
+ break;
+ }
+ case BREAK: case CONTINUE: {
+ if (peekToken() == NAME) consume(NAME);
+ b.add(parserLine, tok, string);
+ consume(SEMI);
+ break;
+ }
+ case VAR: {
+ b.add(parserLine, TOPSCOPE); // push the current scope
+ while(true) {
+ consume(NAME);
+ b.add(parserLine, DECLARE, string); // declare it
+ if (peekToken() == ASSIGN) { // if there is an '=' after the variable name
+ consume(ASSIGN);
+ startExpr(b, NO_COMMA);
+ b.add(parserLine, PUT); // assign it
+ b.add(parserLine, POP); // clean the stack
+ } else {
+ b.add(parserLine, POP); // pop the string pushed by declare
+ }
+ if (peekToken() != COMMA) break;
+ consume(COMMA);
+ }
+ b.add(parserLine, POP); // pop off the topscope
+ if ((mostRecentlyReadToken != RC || peekToken() == SEMI) && peekToken() != -1 && mostRecentlyReadToken != SEMI) consume(SEMI);
+ break;
+ }
+ case IF: {
+ consume(LP);
+ startExpr(b, -1);
+ consume(RP);
+
+ b.add(parserLine, JF, JS.ZERO); // if false, jump to the else-block
+ int size = b.size;
+ parseStatement(b, null);
+
+ if (peekToken() == ELSE) {
+ consume(ELSE);
+ b.add(parserLine, JMP, JS.ZERO); // if we took the true-block, jump over the else-block
+ b.set(size - 1, JS.N(b.size - size + 1));
+ size = b.size;
+ parseStatement(b, null);
+ }
+ b.set(size - 1, JS.N(b.size - size + 1)); // regardless of which branch we took, b[size] needs to point here
+ break;
+ }
+ case WHILE: {
+ consume(LP);
+ if (label != null) b.add(parserLine, LABEL, label);
+ b.add(parserLine, LOOP);
+ int size = b.size;
+ b.add(parserLine, POP); // discard the first-iteration indicator
+ startExpr(b, -1);
+ b.add(parserLine, JT, JS.N(2)); // if the while() clause is true, jump over the BREAK
+ b.add(parserLine, BREAK);
+ consume(RP);
+ parseStatement(b, null);
+ b.add(parserLine, CONTINUE); // if we fall out of the end, definately continue
+ b.set(size - 1, JS.N(b.size - size + 1)); // end of the loop
+ break;
+ }
+ case SWITCH: {
+ consume(LP);
+ if (label != null) b.add(parserLine, LABEL, label);
+ b.add(parserLine, LOOP);
+ int size0 = b.size;
+ startExpr(b, -1);
+ consume(RP);
+ consume(LC);
+ while(true)
+ if (peekToken() == CASE) { // we compile CASE statements like a bunch of if..else's
+ consume(CASE);
+ b.add(parserLine, DUP); // duplicate the switch() value; we'll consume one copy
+ startExpr(b, -1);
+ consume(COLON);
+ b.add(parserLine, EQ); // check if we should do this case-block
+ b.add(parserLine, JF, JS.ZERO); // if not, jump to the next one
+ int size = b.size;
+ while(peekToken() != CASE && peekToken() != DEFAULT && peekToken() != RC) parseStatement(b, null);
+ b.set(size - 1, JS.N(1 + b.size - size));
+ } else if (peekToken() == DEFAULT) {
+ consume(DEFAULT);
+ consume(COLON);
+ while(peekToken() != CASE && peekToken() != DEFAULT && peekToken() != RC) parseStatement(b, null);
+ } else if (peekToken() == RC) {
+ consume(RC);
+ b.add(parserLine, BREAK); // break out of the loop if we 'fall through'
+ break;
+ } else {
+ throw pe("expected CASE, DEFAULT, or RC; got " + codeToString[peekToken()]);
+ }
+ b.set(size0 - 1, JS.N(b.size - size0 + 1)); // end of the loop
+ break;
+ }
+
+ case DO: {
+ if (label != null) b.add(parserLine, LABEL, label);
+ b.add(parserLine, LOOP);
+ int size = b.size;
+ parseStatement(b, null);
+ consume(WHILE);
+ consume(LP);
+ startExpr(b, -1);
+ b.add(parserLine, JT, JS.N(2)); // check the while() clause; jump over the BREAK if true
+ b.add(parserLine, BREAK);
+ b.add(parserLine, CONTINUE);
+ consume(RP);
+ consume(SEMI);
+ b.set(size - 1, JS.N(b.size - size + 1)); // end of the loop; write this location to the LOOP instruction
+ break;
+ }
+
+ case TRY: {
+ b.add(parserLine, TRY); // try bytecode causes a TryMarker to be pushed
+ int tryInsn = b.size - 1;
+ // parse the expression to be TRYed
+ parseStatement(b, null);
+ // pop the try marker. this is pushed when the TRY bytecode is executed
+ b.add(parserLine, POP);
+ // jump forward to the end of the catch block, start of the finally block
+ b.add(parserLine, JMP);
+ int successJMPInsn = b.size - 1;
+
+ if (peekToken() != CATCH && peekToken() != FINALLY)
+ throw pe("try without catch or finally");
+
+ int catchJMPDistance = -1;
+ if (peekToken() == CATCH) {
+ catchJMPDistance = b.size - tryInsn;
+ String exceptionVar;
+ getToken();
+ consume(LP);
+ consume(NAME);
+ exceptionVar = string;
+ consume(RP);
+ b.add(parserLine, TOPSCOPE); // the exception is on top of the stack; put it to the chosen name
+ b.add(parserLine, SWAP);
+ b.add(parserLine, LITERAL,exceptionVar);
+ b.add(parserLine, SWAP);
+ b.add(parserLine, PUT);
+ b.add(parserLine, POP);
+ b.add(parserLine, POP);
+ parseStatement(b, null);
+ // pop the try and catch markers
+ b.add(parserLine,POP);
+ b.add(parserLine,POP);
+ }
+
+ // jump here if no exception was thrown
+ b.set(successJMPInsn, JS.N(b.size - successJMPInsn));
+
+ int finallyJMPDistance = -1;
+ if (peekToken() == FINALLY) {
+ b.add(parserLine, LITERAL, null); // null FinallyData
+ finallyJMPDistance = b.size - tryInsn;
+ consume(FINALLY);
+ parseStatement(b, null);
+ b.add(parserLine,FINALLY_DONE);
+ }
+
+ // setup the TRY arguments
+ b.set(tryInsn, new int[] { catchJMPDistance, finallyJMPDistance });
+
+ break;
+ }
+
+ case FOR: {
+ consume(LP);
+
+ tok = getToken();
+ boolean hadVar = false; // if it's a for..in, we ignore the VAR
+ if (tok == VAR) { hadVar = true; tok = getToken(); }
+ String varName = string;
+ boolean forIn = peekToken() == IN; // determine if this is a for..in loop or not
+ pushBackToken(tok, varName);
+
+ if (forIn) {
+ b.add(parserLine, NEWSCOPE); // for-loops always create new scopes
+ b.add(parserLine, LITERAL, varName); // declare the new variable
+ b.add(parserLine, DECLARE);
+
+ b.add(parserLine, LOOP); // we actually only add this to ensure that BREAK works
+ b.add(parserLine, POP); // discard the first-iteration indicator
+ int size = b.size;
+ consume(NAME);
+ consume(IN);
+ startExpr(b, -1);
+ b.add(parserLine, PUSHKEYS); // push the keys as an array; check the length
+ b.add(parserLine, LITERAL, "length");
+ b.add(parserLine, GET);
+ consume(RP);
+
+ b.add(parserLine, LITERAL, JS.N(1)); // decrement the length
+ b.add(parserLine, SUB);
+ b.add(parserLine, DUP);
+ b.add(parserLine, LITERAL, JS.ZERO); // see if we've exhausted all the elements
+ b.add(parserLine, LT);
+ b.add(parserLine, JF, JS.N(2));
+ b.add(parserLine, BREAK); // if we have, then BREAK
+ b.add(parserLine, GET_PRESERVE); // get the key out of the keys array
+ b.add(parserLine, LITERAL, varName);
+ b.add(parserLine, PUT); // write it to this[varName]
+ parseStatement(b, null); // do some stuff
+ b.add(parserLine, CONTINUE); // continue if we fall out the bottom
+
+ b.set(size - 1, JS.N(b.size - size + 1)); // BREAK to here
+ b.add(parserLine, OLDSCOPE); // restore the scope
+
+ } else {
+ if (hadVar) pushBackToken(VAR, null); // yeah, this actually matters
+ b.add(parserLine, NEWSCOPE); // grab a fresh scope
+
+ parseStatement(b, null); // initializer
+ JSFunction e2 = // we need to put the incrementor before the test
+ new JSFunction(sourceName, parserLine, null); // so we save the test here
+ if (peekToken() != SEMI)
+ startExpr(e2, -1);
+ else
+ e2.add(parserLine, b.LITERAL, Boolean.TRUE); // handle the for(foo;;foo) case
+ consume(SEMI);
+ if (label != null) b.add(parserLine, LABEL, label);
+ b.add(parserLine, LOOP);
+ int size2 = b.size;
+
+ b.add(parserLine, JT, JS.ZERO); // if we're on the first iteration, jump over the incrementor
+ int size = b.size;
+ if (peekToken() != RP) { // do the increment thing
+ startExpr(b, -1);
+ b.add(parserLine, POP);
+ }
+ b.set(size - 1, JS.N(b.size - size + 1));
+ consume(RP);
+
+ b.paste(e2); // ok, *now* test if we're done yet
+ b.add(parserLine, JT, JS.N(2)); // break out if we don't meet the test
+ b.add(parserLine, BREAK);
+ parseStatement(b, null);
+ b.add(parserLine, CONTINUE); // if we fall out the bottom, CONTINUE
+ b.set(size2 - 1, JS.N(b.size - size2 + 1)); // end of the loop
+
+ b.add(parserLine, OLDSCOPE); // get our scope back
+ }
+ break;
+ }
+
+ case NAME: { // either a label or an identifier; this is the one place we're not LL(1)
+ String possiblyTheLabel = string;
+ if (peekToken() == COLON) { // label
+ consume(COLON);
+ parseStatement(b, possiblyTheLabel);
+ break;
+ } else { // expression
+ pushBackToken(NAME, possiblyTheLabel);
+ startExpr(b, -1);
+ b.add(parserLine, POP);
+ if ((mostRecentlyReadToken != RC || peekToken() == SEMI) && peekToken() != -1 && mostRecentlyReadToken != SEMI) consume(SEMI);
+ break;
+ }
+ }
+
+ case SEMI: return; // yep, the null statement is valid
+
+ case LC: { // blocks are statements too
+ pushBackToken();
+ b.add(parserLine, NEWSCOPE);
+ parseBlock(b, label);
+ b.add(parserLine, OLDSCOPE);
+ break;
+ }
+
+ default: { // hope that it's an expression
+ pushBackToken();
+ startExpr(b, -1);
+ b.add(parserLine, POP);
+ if ((mostRecentlyReadToken != RC || peekToken() == SEMI) && peekToken() != -1 && mostRecentlyReadToken != SEMI) consume(SEMI);
+ break;
+ }
+ }
}
- static abstract class ControlTransferException extends Exception { }
- static class BreakException extends ControlTransferException {
- public String label;
- BreakException(String label) { this.label = label; }
- }
- static class ContinueException extends ControlTransferException {
- public String label;
- ContinueException(String label) { this.label = label; }
- }
- static class ReturnException extends ControlTransferException {
- public Object retval;
- ReturnException(Object retval) { this.retval = retval; }
- }
- class ParserException extends RuntimeException {
- public ParserException(String s) { super(sourceName + ":" + line + " " + s); }
- }
-
- public static Number toNumber(Object o) {
- if (o == null) return new Long(0);
- if (o instanceof Number) return ((Number)o);
- if (o instanceof String) try { return new Double((String)o); } catch (NumberFormatException e) { return new Double(0); }
- if (o instanceof Boolean) return ((Boolean)o).booleanValue() ? new Long(1) : new Long(0);
- if (o instanceof JS) return ((JS)o).coerceToNumber();
- // FIXME
- throw new Error("toNumber() got object of type " + o.getClass().getName());
- }
- }
+ // ParserException //////////////////////////////////////////////////////////////////////
+ private IOException pe(String s) { return new IOException(sourceName + ":" + parserLine + " " + s); }
+
+}
projects / org.ibex.core.git / blobdiff