-// Copyright 2003 Adam Megacz, see the COPYING file for licensing [GPL]
+// Copyright 2004 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 CompiledFunctionImpl's.
+ * Parses a stream of lexed tokens into a tree of JSFunction's.
*
* There are three kinds of things we parse: blocks, statements, and
* expressions.
/** for debugging */
public static void main(String[] s) throws Exception {
- CompiledFunctionImpl block = new JS.CompiledFunction("stdin", 0, new InputStreamReader(System.in), null);
+ JS block = JS.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 {
isRightAssociative[ASSIGN] =
isRightAssociative[ASSIGN_BITOR] =
isRightAssociative[ASSIGN_SUB] =
isRightAssociative[ASSIGN_MUL] =
isRightAssociative[ASSIGN_DIV] =
- isRightAssociative[ASSIGN_MOD] = true;
+ isRightAssociative[ASSIGN_MOD] =
+ isRightAssociative[ADD_TRAP] =
+ isRightAssociative[DEL_TRAP] =
+ 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_SUB] =
precedence[ASSIGN_MUL] =
precedence[ASSIGN_DIV] =
- precedence[ASSIGN_MOD] = 1;
- precedence[HOOK] = 2;
- precedence[COMMA] = 3;
- precedence[OR] = precedence[AND] = precedence[BANG] = 4;
- precedence[GT] = precedence[GE] = 5;
- precedence[BITOR] = 6;
- precedence[BITXOR] = 7;
- precedence[BITAND] = 8;
- precedence[EQ] = precedence[NE] = 9;
- precedence[LT] = precedence[LE] = precedence[TYPEOF] = 10;
- precedence[SHEQ] = precedence[SHNE] = 11;
+ precedence[ADD_TRAP] =
+ precedence[DEL_TRAP] =
+ 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] = 13;
- precedence[MUL] = precedence[DIV] = precedence[MOD] = 14;
- precedence[BITNOT] = 15;
- precedence[INC] = precedence[DEC] = 16;
- precedence[LP] = 17;
- precedence[DOT] = precedence[LB] = 18;
+ 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;
}
/** gets a token and throws an exception if it is not <tt>code</tt> */
private void consume(int code) throws IOException {
- if (getToken() != code) throw pe("expected " + codeToString[code] + ", got " + (op == -1 ? "EOF" : codeToString[op]));
+ 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]));
+ }
}
/**
* bytecodes for that expression to <tt>appendTo</tt>; the
* appended bytecodes MUST grow the stack by exactly one element.
*/
- private void startExpr(CompiledFunctionImpl appendTo, int minPrecedence) throws IOException {
+ private void startExpr(JSFunction appendTo, int minPrecedence) throws IOException {
int saveParserLine = parserLine;
_startExpr(appendTo, minPrecedence);
parserLine = saveParserLine;
}
- private void _startExpr(CompiledFunctionImpl appendTo, int minPrecedence) throws IOException {
+ private void _startExpr(JSFunction appendTo, int minPrecedence) throws IOException {
int tok = getToken();
- CompiledFunctionImpl b = appendTo;
+ 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 THIS: b.add(parserLine, TOPSCOPE, null); break;
case NULL: b.add(parserLine, LITERAL, null); break;
- case TRUE: case FALSE: b.add(parserLine, LITERAL, new Boolean(tok == TRUE)); 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, new Integer(0)); // push an array onto the stack
- int size0 = b.size();
+ 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, new Integer(i++)); // push the index in the array to place it into
+ 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, -1); // push the value onto the stack
+ 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, new Integer(i)); // back at the ARRAY instruction, write the size of the array
+ 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, new Double(number.doubleValue() * -1));
+ b.add(parserLine, LITERAL, JS.N(number.doubleValue() * -1));
break;
}
case LP: { // grouping (not calling)
}
case INC: case DEC: { // prefix (not postfix)
startExpr(b, precedence[tok]);
- if (b.get(b.size() - 1) != GET)
+ 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.set(b.size() - 1, tok, new Boolean(true));
+ 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: {
getToken();
b.add(parserLine, LITERAL, string); // grab the key
consume(COLON);
- startExpr(b, -1); // grab the value
+ 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;
case NAME: {
b.add(parserLine, TOPSCOPE);
b.add(parserLine, LITERAL, string);
- continueExprAfterAssignable(b);
+ continueExprAfterAssignable(b,minPrecedence);
break;
}
case FUNCTION: {
consume(LP);
int numArgs = 0;
- CompiledFunctionImpl b2 = new JS.CompiledFunction(sourceName, parserLine, null, null);
+ 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); // push the scope onto the stack
- b2.add(parserLine, SWAP); // swap 'this' and 'arguments'
-
- b2.add(parserLine, LITERAL, "arguments"); // declare arguments (equivalent to 'var arguments;')
- b2.add(parserLine, DECLARE);
-
- b2.add(parserLine, LITERAL, "arguments"); // set this.arguments and leave the value 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);
- b2.add(parserLine, SWAP);
- b2.add(parserLine, POP);
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, LITERAL, string); // declare the name
- b2.add(parserLine, DECLARE);
-
- b2.add(parserLine, LITERAL, new Integer(numArgs)); // retrieve it from the arguments array
- b2.add(parserLine, GET_PRESERVE);
- b2.add(parserLine, SWAP);
- b2.add(parserLine, POP);
-
- b2.add(parserLine, TOPSCOPE); // put it to the current scope
+ 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, LITERAL, string);
+ b2.add(parserLine, DECLARE, varName); // declare the name
b2.add(parserLine, SWAP);
- b2.add(parserLine, PUT);
-
- b2.add(parserLine, POP); // clean the stack
- b2.add(parserLine, POP);
+ b2.add(parserLine, PUT);
+ b2.add(parserLine, POP); // pop the value
+ b2.add(parserLine, POP); // pop the scope
}
if (peekToken() == RP) break;
consume(COMMA);
- numArgs++;
}
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
- parseStatement(b2, null); // the function body
-
- b2.add(parserLine, LITERAL, null); // in case we "fall out the bottom", return NULL
+ b2.add(parserLine, LITERAL, null); // in case we "fall out the bottom", return NULL
b2.add(parserLine, RETURN);
break;
continueExpr(b, minPrecedence);
}
+ private Grammar parseGrammar(Grammar g) throws IOException {
+ int tok = getToken();
+ if (g != null)
+ switch(tok) {
+ case BITOR: return new Grammar.Alternative(g, parseGrammar(null));
+ case ADD: return parseGrammar(new Grammar.Repetition(g, 1, Integer.MAX_VALUE));
+ case MUL: return parseGrammar(new Grammar.Repetition(g, 0, Integer.MAX_VALUE));
+ case HOOK: return parseGrammar(new Grammar.Repetition(g, 0, 1));
+ }
+ Grammar g0 = null;
+ switch(tok) {
+ //case NUMBER: g0 = new Grammar.Literal(number); break;
+ case NAME: g0 = new Grammar.Reference(string); break;
+ case STRING:
+ g0 = new Grammar.Literal(string);
+ if (peekToken() == DOT) {
+ String old = string;
+ consume(DOT);
+ consume(DOT);
+ consume(STRING);
+ if (old.length() != 1 || string.length() != 1) throw pe("literal ranges must be single-char strings");
+ g0 = new Grammar.Range(old.charAt(0), string.charAt(0));
+ }
+ break;
+ case LP: g0 = parseGrammar(null); consume(RP); break;
+ default: pushBackToken(); return g;
+ }
+ if (g == null) return parseGrammar(g0);
+ return parseGrammar(new Grammar.Juxtaposition(g, g0));
+ }
/**
* Assuming that a complete assignable (lvalue) has just been
* expression that modifies the assignable. This method always
* decreases the stack depth by exactly one element.
*/
- private void continueExprAfterAssignable(CompiledFunctionImpl b) throws IOException {
+ private void continueExprAfterAssignable(JSFunction b,int minPrecedence) throws IOException {
int saveParserLine = parserLine;
- _continueExprAfterAssignable(b);
+ _continueExprAfterAssignable(b,minPrecedence);
parserLine = saveParserLine;
}
- private void _continueExprAfterAssignable(CompiledFunctionImpl b) throws IOException {
+ 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_ADD: case ASSIGN_SUB: case ASSIGN_MUL: case ASSIGN_DIV: case ASSIGN_MOD: {
+
+ case GRAMMAR: {
b.add(parserLine, GET_PRESERVE);
- startExpr(b, -1);
- b.add(parserLine, tok - 1);
+ Grammar g = parseGrammar(null);
+ if (peekToken() == LC) {
+ g.action = new JSFunction(sourceName, parserLine, null);
+ parseBlock((JSFunction)g.action);
+ ((JSFunction)g.action).add(parserLine, LITERAL, null); // in case we "fall out the bottom", return NULL
+ ((JSFunction)g.action).add(parserLine, RETURN);
+ }
+ b.add(parserLine, MAKE_GRAMMAR, g);
b.add(parserLine, PUT);
- b.add(parserLine, SWAP);
- b.add(parserLine, POP);
+ break;
+ }
+
+ 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: case ADD_TRAP: case DEL_TRAP: {
+ if (tok != ADD_TRAP && tok != DEL_TRAP) b.add(parserLine, GET_PRESERVE);
+
+ startExpr(b, precedence[tok]);
+
+ int size = b.size;
+
+ if (tok != ADD_TRAP && tok != DEL_TRAP) {
+ // 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);
+ } else {
+ b.add(parserLine, tok);
+ }
break;
}
case INC: case DEC: { // postfix
- b.add(parserLine, GET_PRESERVE);
- b.add(parserLine, LITERAL, new Integer(1));
- b.add(parserLine, tok == INC ? ADD : SUB);
- b.add(parserLine, PUT);
- b.add(parserLine, SWAP);
- b.add(parserLine, POP);
- b.add(parserLine, LITERAL, new Integer(1));
- b.add(parserLine, tok == INC ? SUB : ADD);
+ 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, -1);
+ startExpr(b, precedence[tok]);
b.add(parserLine, PUT);
b.add(parserLine, SWAP);
b.add(parserLine, POP);
break;
}
case LP: {
- int n = parseArgs(b);
- b.add(parserLine,CALLMETHOD,new Integer(n));
+
+ // 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();
- b.add(parserLine, GET);
+ 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;
}
}
* If any bytecodes are appended, they will not alter the stack
* depth.
*/
- private void continueExpr(CompiledFunctionImpl b, int minPrecedence) throws IOException {
+ private void continueExpr(JSFunction b, int minPrecedence) throws IOException {
int saveParserLine = parserLine;
_continueExpr(b, minPrecedence);
parserLine = saveParserLine;
}
- private void _continueExpr(CompiledFunctionImpl b, int minPrecedence) throws IOException {
+ 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;
switch (tok) {
case LP: { // invocation (not grouping)
- int n = parseArgs(b);
- b.add(parserLine, CALL, new Integer(n));
+ 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 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, new Integer(0)); // test to see if we can short-circuit
- int size = b.size();
+ 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, new Integer(2)); // leave the second value on the stack and jump to the end
+ 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 ?
- new Boolean(false) : new Boolean(true)); // target of the short-circuit jump is here
- b.set(size - 1, new Integer(b.size() - size)); // write the target of the short-circuit jump
+ 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: {
- consume(NAME);
+ // support foo..bar syntax for foo[""].bar
+ if (peekToken() == DOT) {
+ string = "";
+ } else {
+ consume(NAME);
+ }
b.add(parserLine, LITERAL, string);
- continueExprAfterAssignable(b);
+ continueExprAfterAssignable(b,minPrecedence);
break;
}
case LB: { // subscripting (not array constructor)
startExpr(b, -1);
consume(RB);
- continueExprAfterAssignable(b);
+ continueExprAfterAssignable(b,minPrecedence);
break;
}
case HOOK: {
- b.add(parserLine, JF, new Integer(0)); // jump to the if-false expression
- int size = b.size();
- startExpr(b, -1); // write the if-true expression
- b.add(parserLine, JMP, new Integer(0)); // if true, jump *over* the if-false expression
- b.set(size - 1, new Integer(b.size() - size + 1)); // now we know where the target of the jump is
+ 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, -1); // write the if-false expression
- b.set(size - 1, new Integer(b.size() - size + 1)); // this is the end; jump to here
+ 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: {
}
// parse a set of comma separated function arguments, assume LP has already been consumed
- private int parseArgs(CompiledFunctionImpl b) throws IOException {
+ // 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, -1);
+ startExpr(b, NO_COMMA);
+ b.add(parserLine, SWAP, JS.N(pushdown));
if (peekToken() == RP) break;
}
consume(COMMA);
}
/** Parse a block of statements which must be surrounded by LC..RC. */
- void parseBlock(CompiledFunctionImpl b) throws IOException { parseBlock(b, null); }
- void parseBlock(CompiledFunctionImpl b, String label) throws IOException {
+ 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;
}
- void _parseBlock(CompiledFunctionImpl b, String label) throws IOException {
+ void _parseBlock(JSFunction b, String label) throws IOException {
if (peekToken() == -1) return;
else if (peekToken() != LC) parseStatement(b, null);
else {
}
/** Parse a single statement, consuming the RC or SEMI which terminates it. */
- void parseStatement(CompiledFunctionImpl b, String label) throws IOException {
+ void parseStatement(JSFunction b, String label) throws IOException {
int saveParserLine = parserLine;
_parseStatement(b, label);
parserLine = saveParserLine;
}
- void _parseStatement(CompiledFunctionImpl b, String label) throws IOException {
+ void _parseStatement(JSFunction b, String label) throws IOException {
int tok = peekToken();
if (tok == -1) return;
switch(tok = getToken()) {
b.add(parserLine, TOPSCOPE); // push the current scope
while(true) {
consume(NAME);
- String name = string;
- b.add(parserLine, LITERAL, name); // push the name to be declared
- b.add(parserLine, DECLARE); // declare it
+ b.add(parserLine, DECLARE, string); // declare it
if (peekToken() == ASSIGN) { // if there is an '=' after the variable name
- b.add(parserLine, LITERAL, name); // put the var name back on the stack
consume(ASSIGN);
- startExpr(b, -1);
+ 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);
}
startExpr(b, -1);
consume(RP);
- b.add(parserLine, JF, new Integer(0)); // if false, jump to the else-block
- int size = b.size();
+ 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, new Integer(0)); // if we took the true-block, jump over the else-block
- b.set(size - 1, new Integer(b.size() - size + 1));
- size = b.size();
+ 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, new Integer(b.size() - size + 1)); // regardless of which branch we took, b[size] needs to point here
+ 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();
+ int size = b.size;
b.add(parserLine, POP); // discard the first-iteration indicator
startExpr(b, -1);
- b.add(parserLine, JT, new Integer(2)); // if the while() clause is true, jump over the BREAK
+ 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, new Integer(b.size() - size + 1)); // end of the loop
+ 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();
+ int size0 = b.size;
startExpr(b, -1);
consume(RP);
consume(LC);
startExpr(b, -1);
consume(COLON);
b.add(parserLine, EQ); // check if we should do this case-block
- b.add(parserLine, JF, new Integer(0)); // if not, jump to the next one
- int size = b.size();
+ 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, new Integer(1 + b.size() - size));
+ b.set(size - 1, JS.N(1 + b.size - size));
} else if (peekToken() == DEFAULT) {
consume(DEFAULT);
consume(COLON);
} else {
throw pe("expected CASE, DEFAULT, or RC; got " + codeToString[peekToken()]);
}
- b.set(size0 - 1, new Integer(b.size() - size0 + 1)); // end of the loop
+ 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();
+ int size = b.size;
parseStatement(b, null);
consume(WHILE);
consume(LP);
startExpr(b, -1);
- b.add(parserLine, JT, new Integer(2)); // check the while() clause; jump over the BREAK if true
+ 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, new Integer(b.size() - size + 1)); // end of the loop; write this location to the LOOP instruction
+ 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);
- int size = b.size();
- parseStatement(b, null); // parse the expression to be TRYed
- b.add(parserLine, POP); // pop the TryMarker
- b.add(parserLine, JMP); // jump forward to the end of the catch block
- int size2 = b.size();
- b.set(size - 1, new Integer(b.size() - size + 1)); // the TRY argument points at the start of the CATCH block
+ 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) {
- getToken();
- consume(LP);
- consume(NAME);
- 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);
- b.add(parserLine, SWAP);
- b.add(parserLine, PUT);
- b.add(parserLine, POP);
- b.add(parserLine, POP);
- parseStatement(b, null);
+ Vec catchEnds = new Vec();
+ boolean catchAll = false;
+
+ catchJMPDistance = b.size - tryInsn;
+
+ while(peekToken() == CATCH && !catchAll) {
+ String exceptionVar;
+ getToken();
+ consume(LP);
+ consume(NAME);
+ exceptionVar = string;
+ int[] writebacks = new int[] { -1, -1, -1 };
+ if (peekToken() != RP) {
+ // extended XWT catch block: catch(e faultCode "foo.bar.baz")
+ consume(NAME);
+ String propName = string;
+ b.add(parserLine, DUP);
+ b.add(parserLine, LITERAL, string);
+ b.add(parserLine, GET);
+ b.add(parserLine, DUP);
+ b.add(parserLine, LITERAL, null);
+ b.add(parserLine, EQ);
+ b.add(parserLine, JT);
+ writebacks[0] = b.size - 1;
+ if (peekToken() == STRING) {
+ consume(STRING);
+ b.add(parserLine, DUP);
+ b.add(parserLine, LITERAL, string);
+ b.add(parserLine, LT);
+ b.add(parserLine, JT);
+ writebacks[1] = b.size - 1;
+ b.add(parserLine, DUP);
+ b.add(parserLine, LITERAL, string + "/"); // (slash is ASCII after dot)
+ b.add(parserLine, GE);
+ b.add(parserLine, JT);
+ writebacks[2] = b.size - 1;
+ } else {
+ consume(NUMBER);
+ b.add(parserLine, DUP);
+ b.add(parserLine, LITERAL, number);
+ b.add(parserLine, EQ);
+ b.add(parserLine, JF);
+ writebacks[1] = b.size - 1;
+ }
+ b.add(parserLine, POP); // pop the element thats on the stack from the compare
+ } else {
+ catchAll = true;
+ }
+ consume(RP);
+ // the exception is on top of the stack; put it to the chosen name
+ b.add(parserLine, NEWSCOPE);
+ b.add(parserLine, TOPSCOPE);
+ b.add(parserLine, SWAP);
+ b.add(parserLine, LITERAL,exceptionVar);
+ b.add(parserLine, DECLARE);
+ b.add(parserLine, SWAP);
+ b.add(parserLine, PUT);
+ b.add(parserLine, POP);
+ b.add(parserLine, POP);
+ parseBlock(b, null);
+ b.add(parserLine, OLDSCOPE);
+
+ b.add(parserLine, JMP);
+ catchEnds.addElement(new Integer(b.size-1));
+
+ for(int i=0; i<3; i++) if (writebacks[i] != -1) b.set(writebacks[i], JS.N(b.size-writebacks[i]));
+ b.add(parserLine, POP); // pop the element thats on the stack from the compare
+ }
+
+ if(!catchAll)
+ b.add(parserLine, THROW);
+
+ for(int i=0;i<catchEnds.size();i++) {
+ int n = ((Integer)catchEnds.elementAt(i)).intValue();
+ b.set(n, JS.N(b.size-n));
+ }
+
+ // pop the try and catch markers
+ b.add(parserLine,POP);
+ b.add(parserLine,POP);
}
-
+
// jump here if no exception was thrown
- b.set(size2 - 1, new Integer(b.size() - size2 + 1));
-
- // FIXME: not implemented correctly
+ 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;
}
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();
+ int size = b.size;
consume(NAME);
consume(IN);
startExpr(b, -1);
b.add(parserLine, GET);
consume(RP);
- b.add(parserLine, LITERAL, new Integer(1)); // decrement the length
+ b.add(parserLine, LITERAL, JS.N(1)); // decrement the length
b.add(parserLine, SUB);
b.add(parserLine, DUP);
- b.add(parserLine, LITERAL, new Integer(0)); // see if we've exhausted all the elements
+ b.add(parserLine, LITERAL, JS.ZERO); // see if we've exhausted all the elements
b.add(parserLine, LT);
- b.add(parserLine, JF, new Integer(2));
+ 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);
parseStatement(b, null); // do some stuff
b.add(parserLine, CONTINUE); // continue if we fall out the bottom
- b.set(size - 1, new Integer(b.size() - size + 1)); // BREAK to here
+ b.set(size - 1, JS.N(b.size - size + 1)); // BREAK to here
b.add(parserLine, OLDSCOPE); // restore the scope
} else {
b.add(parserLine, NEWSCOPE); // grab a fresh scope
parseStatement(b, null); // initializer
- CompiledFunctionImpl e2 = // we need to put the incrementor before the test
- new JS.CompiledFunction(sourceName, parserLine, null, null); // so we save the test here
+ 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
consume(SEMI);
if (label != null) b.add(parserLine, LABEL, label);
b.add(parserLine, LOOP);
- int size2 = b.size();
+ int size2 = b.size;
- b.add(parserLine, JT, new Integer(0)); // if we're on the first iteration, jump over the incrementor
- int size = 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, new Integer(b.size() - size + 1));
+ 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, new Integer(2)); // break out if we don't meet the test
+ 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, new Integer(b.size() - size2 + 1)); // end of the loop
+ b.set(size2 - 1, JS.N(b.size - size2 + 1)); // end of the loop
b.add(parserLine, OLDSCOPE); // get our scope back
}