Blame view
circus/javadoc/java_cup/lalr_item.html
28.6 KB
8d0dc533f
first
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 |
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<!--NewPage-->
<HTML>
<HEAD>
<!-- Generated by javadoc (build 1.5.0_01) on Mon Apr 23 21:09:00 GMT 2007 -->
<TITLE>
lalr_item
</TITLE>
<META NAME="keywords" CONTENT="java_cup.lalr_item class">
<LINK REL ="stylesheet" TYPE="text/css" HREF="../stylesheet.css" TITLE="Style">
<SCRIPT type="text/javascript">
function windowTitle()
{
parent.document.title="lalr_item";
}
</SCRIPT>
<NOSCRIPT>
</NOSCRIPT>
</HEAD>
<BODY BGCOLOR="white" onload="windowTitle();">
<!-- ========= START OF TOP NAVBAR ======= -->
<A NAME="navbar_top"><!-- --></A>
<A HREF="#skip-navbar_top" title="Skip navigation links"></A>
<TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY="">
<TR>
<TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1">
<A NAME="navbar_top_firstrow"><!-- --></A>
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY="">
<TR ALIGN="center" VALIGN="top">
<TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD>
<TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD>
<TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD>
<TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/lalr_item.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD>
<TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD>
<TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD>
<TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../index-files/index-1.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD>
<TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD>
</TR>
</TABLE>
</TD>
<TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM>
</EM>
</TD>
</TR>
<TR>
<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
<A HREF="../java_cup/internal_error.html" title="class in java_cup"><B>PREV CLASS</B></A>
<A HREF="../java_cup/lalr_item_set.html" title="class in java_cup"><B>NEXT CLASS</B></A></FONT></TD>
<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
<A HREF="../index.html?java_cup/lalr_item.html" target="_top"><B>FRAMES</B></A>
<A HREF="lalr_item.html" target="_top"><B>NO FRAMES</B></A>
<SCRIPT type="text/javascript">
<!--
if(window==top) {
document.writeln('<A HREF="../allclasses-noframe.html"><B>All Classes</B></A>');
}
//-->
</SCRIPT>
<NOSCRIPT>
<A HREF="../allclasses-noframe.html"><B>All Classes</B></A>
</NOSCRIPT>
</FONT></TD>
</TR>
<TR>
<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
SUMMARY: NESTED | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD>
<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD>
</TR>
</TABLE>
<A NAME="skip-navbar_top"></A>
<!-- ========= END OF TOP NAVBAR ========= -->
<HR>
<!-- ======== START OF CLASS DATA ======== -->
<H2>
<FONT SIZE="-1">
java_cup</FONT>
<BR>
Class lalr_item</H2>
<PRE>
java.lang.Object
<IMG SRC="../resources/inherit.gif" ALT="extended by "><A HREF="../java_cup/lr_item_core.html" title="class in java_cup">java_cup.lr_item_core</A>
<IMG SRC="../resources/inherit.gif" ALT="extended by "><B>java_cup.lalr_item</B>
</PRE>
<HR>
<DL>
<DT><PRE>public class <B>lalr_item</B><DT>extends <A HREF="../java_cup/lr_item_core.html" title="class in java_cup">lr_item_core</A></DL>
</PRE>
<P>
This class represents an LALR item. Each LALR item consists of
a production, a "dot" at a position within that production, and
a set of lookahead symbols (terminal). (The first two of these parts
are provide by the super class). An item is designed to represent a
configuration that the parser may be in. For example, an item of the
form: <pre>
[A ::= B * C d E , {a,b,c}]
</pre>
indicates that the parser is in the middle of parsing the production <pre>
A ::= B C d E
</pre>
that B has already been parsed, and that we will expect to see a lookahead
of either a, b, or c once the complete RHS of this production has been
found.<p>
Items may initially be missing some items from their lookahead sets.
Links are maintained from each item to the set of items that would need
to be updated if symbols are added to its lookahead set. During
"lookahead propagation", we add symbols to various lookahead sets and
propagate these changes across these dependency links as needed.
<P>
<P>
<DL>
<DT><B>Version:</B></DT>
<DD>last updated: 11/25/95</DD>
<DT><B>Author:</B></DT>
<DD>Scott Hudson</DD>
<DT><B>See Also:</B><DD><A HREF="../java_cup/lalr_item_set.html" title="class in java_cup"><CODE>lalr_item_set</CODE></A>,
<A HREF="../java_cup/lalr_state.html" title="class in java_cup"><CODE>lalr_state</CODE></A></DL>
<HR>
<P>
<!-- =========== FIELD SUMMARY =========== -->
<A NAME="field_summary"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Field Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected <A HREF="../java_cup/terminal_set.html" title="class in java_cup">terminal_set</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lalr_item.html#_lookahead">_lookahead</A></B></CODE>
<BR>
The lookahead symbols of the item.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected java.util.Stack</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lalr_item.html#_propagate_items">_propagate_items</A></B></CODE>
<BR>
Links to items that the lookahead needs to be propagated to.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lalr_item.html#needs_propagation">needs_propagation</A></B></CODE>
<BR>
Flag to indicate that this item needs to propagate its lookahead
(whether it has changed or not).</TD>
</TR>
</TABLE>
<A NAME="fields_inherited_from_class_java_cup.lr_item_core"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Fields inherited from class java_cup.<A HREF="../java_cup/lr_item_core.html" title="class in java_cup">lr_item_core</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../java_cup/lr_item_core.html#_core_hash_cache">_core_hash_cache</A>, <A HREF="../java_cup/lr_item_core.html#_dot_pos">_dot_pos</A>, <A HREF="../java_cup/lr_item_core.html#_symbol_after_dot">_symbol_after_dot</A>, <A HREF="../java_cup/lr_item_core.html#_the_production">_the_production</A></CODE></TD>
</TR>
</TABLE>
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
<A NAME="constructor_summary"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Constructor Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../java_cup/lalr_item.html#lalr_item(java_cup.production)">lalr_item</A></B>(<A HREF="../java_cup/production.html" title="class in java_cup">production</A> prod)</CODE>
<BR>
Constructor with default position and empty lookahead set.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../java_cup/lalr_item.html#lalr_item(java_cup.production, int, java_cup.terminal_set)">lalr_item</A></B>(<A HREF="../java_cup/production.html" title="class in java_cup">production</A> prod,
int pos,
<A HREF="../java_cup/terminal_set.html" title="class in java_cup">terminal_set</A> look)</CODE>
<BR>
Full constructor.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../java_cup/lalr_item.html#lalr_item(java_cup.production, java_cup.terminal_set)">lalr_item</A></B>(<A HREF="../java_cup/production.html" title="class in java_cup">production</A> prod,
<A HREF="../java_cup/terminal_set.html" title="class in java_cup">terminal_set</A> look)</CODE>
<BR>
Constructor with default position (dot at start).</TD>
</TR>
</TABLE>
<!-- ========== METHOD SUMMARY =========== -->
<A NAME="method_summary"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Method Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lalr_item.html#add_propagate(java_cup.lalr_item)">add_propagate</A></B>(<A HREF="../java_cup/lalr_item.html" title="class in java_cup">lalr_item</A> prop_to)</CODE>
<BR>
Add a new item to the set of items we propagate to.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../java_cup/terminal_set.html" title="class in java_cup">terminal_set</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lalr_item.html#calc_lookahead(java_cup.terminal_set)">calc_lookahead</A></B>(<A HREF="../java_cup/terminal_set.html" title="class in java_cup">terminal_set</A> lookahead_after)</CODE>
<BR>
Calculate lookahead representing symbols that could appear after the
symbol that the dot is currently in front of.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lalr_item.html#equals(java_cup.lalr_item)">equals</A></B>(<A HREF="../java_cup/lalr_item.html" title="class in java_cup">lalr_item</A> other)</CODE>
<BR>
Equality comparison -- here we only require the cores to be equal since
we need to do sets of items based only on core equality (ignoring
lookahead sets).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lalr_item.html#equals(java.lang.Object)">equals</A></B>(java.lang.Object other)</CODE>
<BR>
Generic equality comparison.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lalr_item.html#hashCode()">hashCode</A></B>()</CODE>
<BR>
Return a hash code -- here we only hash the core since we only test core
matching in LALR items.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lalr_item.html#lookahead_visible()">lookahead_visible</A></B>()</CODE>
<BR>
Determine if everything from the symbol one beyond the dot all the
way to the end of the right hand side is nullable.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../java_cup/terminal_set.html" title="class in java_cup">terminal_set</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lalr_item.html#lookahead()">lookahead</A></B>()</CODE>
<BR>
The lookahead symbols of the item.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.util.Stack</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lalr_item.html#propagate_items()">propagate_items</A></B>()</CODE>
<BR>
Links to items that the lookahead needs to be propagated to</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lalr_item.html#propagate_lookaheads(java_cup.terminal_set)">propagate_lookaheads</A></B>(<A HREF="../java_cup/terminal_set.html" title="class in java_cup">terminal_set</A> incoming)</CODE>
<BR>
Propagate incoming lookaheads through this item to others need to
be changed.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../java_cup/lalr_item.html" title="class in java_cup">lalr_item</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lalr_item.html#shift()">shift</A></B>()</CODE>
<BR>
Produce the new lalr_item that results from shifting the dot one position
to the right.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lalr_item.html#toString()">toString</A></B>()</CODE>
<BR>
Convert to string.</TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_java_cup.lr_item_core"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class java_cup.<A HREF="../java_cup/lr_item_core.html" title="class in java_cup">lr_item_core</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../java_cup/lr_item_core.html#core_equals(java_cup.lr_item_core)">core_equals</A>, <A HREF="../java_cup/lr_item_core.html#core_hashCode()">core_hashCode</A>, <A HREF="../java_cup/lr_item_core.html#dot_at_end()">dot_at_end</A>, <A HREF="../java_cup/lr_item_core.html#dot_before_nt()">dot_before_nt</A>, <A HREF="../java_cup/lr_item_core.html#dot_pos()">dot_pos</A>, <A HREF="../java_cup/lr_item_core.html#equals(java_cup.lr_item_core)">equals</A>, <A HREF="../java_cup/lr_item_core.html#obj_hash()">obj_hash</A>, <A HREF="../java_cup/lr_item_core.html#shift_core()">shift_core</A>, <A HREF="../java_cup/lr_item_core.html#symbol_after_dot()">symbol_after_dot</A>, <A HREF="../java_cup/lr_item_core.html#the_production()">the_production</A>, <A HREF="../java_cup/lr_item_core.html#to_simple_string()">to_simple_string</A></CODE></TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, finalize, getClass, notify, notifyAll, wait, wait, wait</CODE></TD>
</TR>
</TABLE>
<P>
<!-- ============ FIELD DETAIL =========== -->
<A NAME="field_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Field Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="_lookahead"><!-- --></A><H3>
_lookahead</H3>
<PRE>
protected <A HREF="../java_cup/terminal_set.html" title="class in java_cup">terminal_set</A> <B>_lookahead</B></PRE>
<DL>
<DD>The lookahead symbols of the item.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="_propagate_items"><!-- --></A><H3>
_propagate_items</H3>
<PRE>
protected java.util.Stack <B>_propagate_items</B></PRE>
<DL>
<DD>Links to items that the lookahead needs to be propagated to.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="needs_propagation"><!-- --></A><H3>
needs_propagation</H3>
<PRE>
protected boolean <B>needs_propagation</B></PRE>
<DL>
<DD>Flag to indicate that this item needs to propagate its lookahead
(whether it has changed or not).
<P>
<DL>
</DL>
</DL>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<A NAME="constructor_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Constructor Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="lalr_item(java_cup.production, int, java_cup.terminal_set)"><!-- --></A><H3>
lalr_item</H3>
<PRE>
public <B>lalr_item</B>(<A HREF="../java_cup/production.html" title="class in java_cup">production</A> prod,
int pos,
<A HREF="../java_cup/terminal_set.html" title="class in java_cup">terminal_set</A> look)
throws <A HREF="../java_cup/internal_error.html" title="class in java_cup">internal_error</A></PRE>
<DL>
<DD>Full constructor.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>prod</CODE> - the production for the item.<DD><CODE>pos</CODE> - the position of the "dot" within the production.<DD><CODE>look</CODE> - the set of lookahead symbols.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../java_cup/internal_error.html" title="class in java_cup">internal_error</A></CODE></DL>
</DL>
<HR>
<A NAME="lalr_item(java_cup.production, java_cup.terminal_set)"><!-- --></A><H3>
lalr_item</H3>
<PRE>
public <B>lalr_item</B>(<A HREF="../java_cup/production.html" title="class in java_cup">production</A> prod,
<A HREF="../java_cup/terminal_set.html" title="class in java_cup">terminal_set</A> look)
throws <A HREF="../java_cup/internal_error.html" title="class in java_cup">internal_error</A></PRE>
<DL>
<DD>Constructor with default position (dot at start).
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>prod</CODE> - the production for the item.<DD><CODE>look</CODE> - the set of lookahead symbols.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../java_cup/internal_error.html" title="class in java_cup">internal_error</A></CODE></DL>
</DL>
<HR>
<A NAME="lalr_item(java_cup.production)"><!-- --></A><H3>
lalr_item</H3>
<PRE>
public <B>lalr_item</B>(<A HREF="../java_cup/production.html" title="class in java_cup">production</A> prod)
throws <A HREF="../java_cup/internal_error.html" title="class in java_cup">internal_error</A></PRE>
<DL>
<DD>Constructor with default position and empty lookahead set.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>prod</CODE> - the production for the item.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../java_cup/internal_error.html" title="class in java_cup">internal_error</A></CODE></DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Method Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="lookahead()"><!-- --></A><H3>
lookahead</H3>
<PRE>
public <A HREF="../java_cup/terminal_set.html" title="class in java_cup">terminal_set</A> <B>lookahead</B>()</PRE>
<DL>
<DD>The lookahead symbols of the item.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="propagate_items()"><!-- --></A><H3>
propagate_items</H3>
<PRE>
public java.util.Stack <B>propagate_items</B>()</PRE>
<DL>
<DD>Links to items that the lookahead needs to be propagated to
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="add_propagate(java_cup.lalr_item)"><!-- --></A><H3>
add_propagate</H3>
<PRE>
public void <B>add_propagate</B>(<A HREF="../java_cup/lalr_item.html" title="class in java_cup">lalr_item</A> prop_to)</PRE>
<DL>
<DD>Add a new item to the set of items we propagate to.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="propagate_lookaheads(java_cup.terminal_set)"><!-- --></A><H3>
propagate_lookaheads</H3>
<PRE>
public void <B>propagate_lookaheads</B>(<A HREF="../java_cup/terminal_set.html" title="class in java_cup">terminal_set</A> incoming)
throws <A HREF="../java_cup/internal_error.html" title="class in java_cup">internal_error</A></PRE>
<DL>
<DD>Propagate incoming lookaheads through this item to others need to
be changed.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../java_cup/internal_error.html" title="class in java_cup">internal_error</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="shift()"><!-- --></A><H3>
shift</H3>
<PRE>
public <A HREF="../java_cup/lalr_item.html" title="class in java_cup">lalr_item</A> <B>shift</B>()
throws <A HREF="../java_cup/internal_error.html" title="class in java_cup">internal_error</A></PRE>
<DL>
<DD>Produce the new lalr_item that results from shifting the dot one position
to the right.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../java_cup/internal_error.html" title="class in java_cup">internal_error</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="calc_lookahead(java_cup.terminal_set)"><!-- --></A><H3>
calc_lookahead</H3>
<PRE>
public <A HREF="../java_cup/terminal_set.html" title="class in java_cup">terminal_set</A> <B>calc_lookahead</B>(<A HREF="../java_cup/terminal_set.html" title="class in java_cup">terminal_set</A> lookahead_after)
throws <A HREF="../java_cup/internal_error.html" title="class in java_cup">internal_error</A></PRE>
<DL>
<DD>Calculate lookahead representing symbols that could appear after the
symbol that the dot is currently in front of. Note: this routine must
not be invoked before first sets and nullability has been calculated
for all non terminals.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../java_cup/internal_error.html" title="class in java_cup">internal_error</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="lookahead_visible()"><!-- --></A><H3>
lookahead_visible</H3>
<PRE>
public boolean <B>lookahead_visible</B>()
throws <A HREF="../java_cup/internal_error.html" title="class in java_cup">internal_error</A></PRE>
<DL>
<DD>Determine if everything from the symbol one beyond the dot all the
way to the end of the right hand side is nullable. This would indicate
that the lookahead of this item must be included in the lookaheads of
all items produced as a closure of this item. Note: this routine should
not be invoked until after first sets and nullability have been
calculated for all non terminals.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../java_cup/internal_error.html" title="class in java_cup">internal_error</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="equals(java_cup.lalr_item)"><!-- --></A><H3>
equals</H3>
<PRE>
public boolean <B>equals</B>(<A HREF="../java_cup/lalr_item.html" title="class in java_cup">lalr_item</A> other)</PRE>
<DL>
<DD>Equality comparison -- here we only require the cores to be equal since
we need to do sets of items based only on core equality (ignoring
lookahead sets).
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
equals</H3>
<PRE>
public boolean <B>equals</B>(java.lang.Object other)</PRE>
<DL>
<DD>Generic equality comparison.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../java_cup/lr_item_core.html#equals(java.lang.Object)">equals</A></CODE> in class <CODE><A HREF="../java_cup/lr_item_core.html" title="class in java_cup">lr_item_core</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="hashCode()"><!-- --></A><H3>
hashCode</H3>
<PRE>
public int <B>hashCode</B>()</PRE>
<DL>
<DD>Return a hash code -- here we only hash the core since we only test core
matching in LALR items.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../java_cup/lr_item_core.html#hashCode()">hashCode</A></CODE> in class <CODE><A HREF="../java_cup/lr_item_core.html" title="class in java_cup">lr_item_core</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public java.lang.String <B>toString</B>()</PRE>
<DL>
<DD>Convert to string.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../java_cup/lr_item_core.html#toString()">toString</A></CODE> in class <CODE><A HREF="../java_cup/lr_item_core.html" title="class in java_cup">lr_item_core</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<!-- ========= END OF CLASS DATA ========= -->
<HR>
<!-- ======= START OF BOTTOM NAVBAR ====== -->
<A NAME="navbar_bottom"><!-- --></A>
<A HREF="#skip-navbar_bottom" title="Skip navigation links"></A>
<TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY="">
<TR>
<TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1">
<A NAME="navbar_bottom_firstrow"><!-- --></A>
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY="">
<TR ALIGN="center" VALIGN="top">
<TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD>
<TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD>
<TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD>
<TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/lalr_item.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD>
<TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD>
<TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD>
<TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../index-files/index-1.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD>
<TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD>
</TR>
</TABLE>
</TD>
<TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM>
</EM>
</TD>
</TR>
<TR>
<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
<A HREF="../java_cup/internal_error.html" title="class in java_cup"><B>PREV CLASS</B></A>
<A HREF="../java_cup/lalr_item_set.html" title="class in java_cup"><B>NEXT CLASS</B></A></FONT></TD>
<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
<A HREF="../index.html?java_cup/lalr_item.html" target="_top"><B>FRAMES</B></A>
<A HREF="lalr_item.html" target="_top"><B>NO FRAMES</B></A>
<SCRIPT type="text/javascript">
<!--
if(window==top) {
document.writeln('<A HREF="../allclasses-noframe.html"><B>All Classes</B></A>');
}
//-->
</SCRIPT>
<NOSCRIPT>
<A HREF="../allclasses-noframe.html"><B>All Classes</B></A>
</NOSCRIPT>
</FONT></TD>
</TR>
<TR>
<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
SUMMARY: NESTED | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD>
<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD>
</TR>
</TABLE>
<A NAME="skip-navbar_bottom"></A>
<!-- ======== END OF BOTTOM NAVBAR ======= -->
<HR>
</BODY>
</HTML>
|