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/*
* Copyright 2004-2010 H2 Group. Multiple-Licensed under the H2 License,
* Version 1.0, and under the Eclipse Public License, Version 1.0
* (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.bnf;
import java.util.HashMap;
import java.util.Random;
/**
* Represents a hard coded terminal rule in a BNF object.
*/
public class RuleFixed implements Rule {
static final int YMD = 0, HMS = 1, NANOS = 2;
static final int ANY_EXCEPT_SINGLE_QUOTE = 3;
static final int ANY_EXCEPT_DOUBLE_QUOTE = 4;
static final int ANY_UNTIL_EOL = 5;
static final int ANY_UNTIL_END = 6;
static final int ANY_WORD = 7;
static final int ANY_EXCEPT_2_DOLLAR = 8;
static final int HEX_START = 10, CONCAT = 11, AZ_UNDERSCORE = 12, AF = 13, DIGIT = 14;
static final int OPEN_BRACKET = 15, CLOSE_BRACKET = 16;
private final int type;
RuleFixed(int type) {
this.type = type;
}
public String toString() {
switch(type) {
case YMD:
return "2000-01-01";
case HMS:
return "12:00";
case NANOS:
return "0";
case ANY_UNTIL_EOL:
case ANY_EXCEPT_SINGLE_QUOTE:
case ANY_EXCEPT_DOUBLE_QUOTE:
case ANY_WORD:
case ANY_EXCEPT_2_DOLLAR:
case ANY_UNTIL_END: {
return "XYZ";
}
case HEX_START:
return "0x";
case CONCAT:
return "||";
case AZ_UNDERSCORE:
return "A";
case AF:
return "F";
case DIGIT:
return "0";
case OPEN_BRACKET:
return "[";
case CLOSE_BRACKET:
return "]";
default:
throw new AssertionError("type="+type);
}
}
public String getHtmlRailroad(Bnf config, boolean topLevel) {
return getHtmlText();
}
public String getHtmlText() {
switch(type) {
case YMD:
return "2000-01-01";
case HMS:
return "12:00:00";
case NANOS:
return "000000000";
case ANY_UNTIL_EOL:
case ANY_EXCEPT_SINGLE_QUOTE:
case ANY_EXCEPT_DOUBLE_QUOTE:
case ANY_WORD:
case ANY_EXCEPT_2_DOLLAR:
case ANY_UNTIL_END: {
return "anything";
}
case HEX_START:
return "0x";
case CONCAT:
return "||";
case AZ_UNDERSCORE:
return "A-Z | _";
case AF:
return "A-F";
case DIGIT:
return "0-9";
case OPEN_BRACKET:
return "[";
case CLOSE_BRACKET:
return "]";
default:
throw new AssertionError("type="+type);
}
}
public String random(Bnf config, int level) {
Random r = config.getRandom();
switch (type) {
case YMD:
return (1800 + r.nextInt(200)) + "-" + (1 + r.nextInt(12)) + "-" + (1 + r.nextInt(31));
case HMS:
return (r.nextInt(24)) + "-" + (r.nextInt(60)) + "-" + (r.nextInt(60));
case NANOS:
return "" + (r.nextInt(100000) + r.nextInt(10000));
case ANY_UNTIL_EOL:
case ANY_EXCEPT_SINGLE_QUOTE:
case ANY_EXCEPT_DOUBLE_QUOTE:
case ANY_WORD:
case ANY_EXCEPT_2_DOLLAR:
case ANY_UNTIL_END: {
StringBuilder buff = new StringBuilder();
int len = r.nextBoolean() ? 1 : r.nextInt(5);
for (int i = 0; i < len; i++) {
buff.append((char) ('A' + r.nextInt('C' - 'A')));
}
return buff.toString();
}
case HEX_START:
return "0x";
case CONCAT:
return "||";
case AZ_UNDERSCORE:
return "" + (char) ('A' + r.nextInt('C' - 'A'));
case AF:
return "" + (char) ('A' + r.nextInt('F' - 'A'));
case DIGIT:
return "" + (char) ('0' + r.nextInt(10));
case OPEN_BRACKET:
return "[";
case CLOSE_BRACKET:
return "]";
default:
throw new AssertionError("type="+type);
}
}
public String name() {
return "type="+type;
}
public Rule last() {
return this;
}
public void setLinks(HashMap ruleMap) {
// nothing to do
}
public boolean matchRemove(Sentence sentence) {
if (sentence.shouldStop()) {
return false;
}
String query = sentence.getQuery();
if (query.length() == 0) {
return false;
}
String s = query;
switch(type) {
case YMD:
while (s.length() > 0 && "0123456789- ".indexOf(s.charAt(0)) >= 0) {
s = s.substring(1);
}
break;
case HMS:
while (s.length() > 0 && "0123456789:. ".indexOf(s.charAt(0)) >= 0) {
s = s.substring(1);
}
break;
case NANOS:
while (s.length() > 0 && Character.isDigit(s.charAt(0))) {
s = s.substring(1);
}
break;
case ANY_WORD:
while (s.length() > 0 && Character.isWhitespace(s.charAt(0))) {
s = s.substring(1);
}
break;
case ANY_UNTIL_END:
while (s.length() > 1 && s.startsWith("*/")) {
s = s.substring(1);
}
break;
case ANY_UNTIL_EOL:
while (s.length() > 0 && s.charAt(0) != '\n') {
s = s.substring(1);
}
break;
case ANY_EXCEPT_SINGLE_QUOTE:
while (true) {
while (s.length() > 0 && s.charAt(0) != '\'') {
s = s.substring(1);
}
if (s.startsWith("''")) {
s = s.substring(2);
} else {
break;
}
}
break;
case ANY_EXCEPT_DOUBLE_QUOTE:
while (true) {
while (s.length() > 0 && s.charAt(0) != '\"') {
s = s.substring(1);
}
if (s.startsWith("\"\"")) {
s = s.substring(2);
} else {
break;
}
}
break;
case ANY_EXCEPT_2_DOLLAR:
while (true) {
while (s.length() > 0 && !s.startsWith("$$")) {
s = s.substring(1);
}
break;
}
break;
case HEX_START:
if (s.startsWith("0X") || s.startsWith("0x")) {
s = s.substring(2);
} else if (s.startsWith("0")) {
s = s.substring(1);
}
break;
case CONCAT:
if (s.startsWith("||")) {
s = s.substring(2);
} else if (s.startsWith("|")) {
s = s.substring(1);
}
break;
case AZ_UNDERSCORE:
if (s.length() > 0 && (Character.isLetter(s.charAt(0)) || s.charAt(0) == '_')) {
s = s.substring(1);
}
break;
case AF:
if (s.length() > 0) {
char ch = Character.toUpperCase(s.charAt(0));
if (ch >= 'A' && ch <= 'F') {
s = s.substring(1);
}
}
break;
case DIGIT:
if (s.length() > 0 && Character.isDigit(s.charAt(0))) {
s = s.substring(1);
}
break;
case OPEN_BRACKET:
s = s.substring(1);
break;
case CLOSE_BRACKET:
s = s.substring(1);
break;
default:
throw new AssertionError("type=" + type);
}
if (s.equals(query)) {
return false;
}
sentence.setQuery(s);
return true;
}
public void addNextTokenList(Sentence sentence) {
if (sentence.shouldStop()) {
return;
}
String query = sentence.getQuery();
switch(type) {
case YMD:
if (query.length() == 0) {
sentence.add("2006-01-01", "2006-01-01", Sentence.KEYWORD);
}
break;
case HMS:
if (query.length() == 0) {
sentence.add("12:00:00", "12:00:00", Sentence.KEYWORD);
}
break;
case NANOS:
if (query.length() == 0) {
sentence.add("nanoseconds", "0", Sentence.KEYWORD);
}
break;
case ANY_EXCEPT_SINGLE_QUOTE:
if (query.length() == 0) {
sentence.add("anything", "Hello World", Sentence.KEYWORD);
sentence.add("'", "'", Sentence.KEYWORD);
}
break;
case ANY_EXCEPT_2_DOLLAR:
if (query.length() == 0) {
sentence.add("anything", "Hello World", Sentence.KEYWORD);
sentence.add("'", "'", Sentence.KEYWORD);
}
break;
case ANY_EXCEPT_DOUBLE_QUOTE:
if (query.length() == 0) {
sentence.add("anything", "identifier", Sentence.KEYWORD);
}
break;
case ANY_WORD:
break;
case HEX_START:
if (query.length() == 0) {
sentence.add("0x", "0x", Sentence.KEYWORD);
} else if ("0".equals(query)) {
sentence.add("0x", "x", Sentence.KEYWORD);
}
break;
case CONCAT:
if (query.length() == 0) {
sentence.add("||", "||", Sentence.KEYWORD);
} else if ("|".equals(query)) {
sentence.add("||", "|", Sentence.KEYWORD);
}
break;
case AZ_UNDERSCORE:
if (query.length() == 0) {
sentence.add("character", "A", Sentence.KEYWORD);
}
break;
case AF:
if (query.length() == 0) {
sentence.add("hex character", "0A", Sentence.KEYWORD);
}
break;
case DIGIT:
if (query.length() == 0) {
sentence.add("digit", "1", Sentence.KEYWORD);
}
break;
case OPEN_BRACKET:
sentence.add("[", "[", Sentence.KEYWORD);
break;
case CLOSE_BRACKET:
sentence.add("]", "]", Sentence.KEYWORD);
break;
default:
throw new AssertionError("type="+type);
}
}
}