jscript: Fix handling of numbers starting with decimal separator.

dlls/jscript/lex.c

@@ -603,7 +603,7 @@ static int next_token(parser_ctx_t *ctx, void *lval)
         return '}';
 
     case '.':
-        if(++ctx->ptr < ctx->end && isdigitW(*ctx->ptr)) {
+        if(ctx->ptr+1 < ctx->end && isdigitW(ctx->ptr[1])) {
             double n;
             HRESULT hres;
             hres = parse_decimal(&ctx->ptr, ctx->end, &n);
@@ -614,6 +614,7 @@ static int next_token(parser_ctx_t *ctx, void *lval)
             *(literal_t**)lval = new_double_literal(ctx, n);
             return tNumericLiteral;
         }
+        ctx->ptr++;
         return '.';
 
     case '<':

dlls/jscript/tests/lang.js

@@ -407,6 +407,10 @@ tmp = 2.5*3.5;
 ok(tmp > 8.749999 && tmp < 8.750001, "2.5*3.5 !== 8.75");
 ok(getVT(tmp) === "VT_R8", "getVT(2.5*3.5) !== VT_R8");
 
+tmp = 2*.5;
+ok(tmp === 1, "2*.5 !== 1");
+ok(getVT(tmp) == "VT_I4", "getVT(2*.5) !== VT_I4");
+
 tmp = 4/2;
 ok(tmp === 2, "4/2 !== 2");
 ok(getVT(tmp) === "VT_I4", "getVT(4/2) !== VT_I4");