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-
- package com.dmdirc.addons.calc;
-
- import java.util.ArrayList;
- import java.util.List;
- import java.util.regex.Matcher;
- import java.util.regex.Pattern;
-
- public enum TokenType {
-
- START(TokenTypeArity.HIDDEN, "^", 0, "NUMBER_*", "BRACKET_OPEN", "MOD_*"),
- END(TokenTypeArity.HIDDEN, "$", 0),
-
- BRACKET_OPEN(TokenTypeArity.NULLARY, "\\(", 0, "NUMBER_*", "MOD_*", "BRACKET_OPEN"),
- BRACKET_CLOSE(TokenTypeArity.NULLARY, "\\)", 50, "OP_*", "BRACKET_*", "END"),
-
- NUMBER_FLOAT(TokenTypeArity.NULLARY, "[0-9]+\\.[0-9]+", 1, "OP_*", "BRACKET_*", "END") {
- public Number evaluate(final TreeToken token) {
- return Float.valueOf(token.getToken().getContent());
- }
- },
-
- NUMBER_INT(TokenTypeArity.NULLARY, "[0-9]+", 1, "OP_*", "BRACKET_*", "END") {
- public Number evaluate(final TreeToken token) {
- return Float.valueOf(token.getToken().getContent());
- }
- },
-
- MOD_POSITIVE(TokenTypeArity.UNARY, "\\+", 100, "NUMBER_*") {
- public Number evaluate(final TreeToken token) {
- return token.getChildren().get(0).evaluate();
- }
- },
-
- MOD_NEGATIVE(TokenTypeArity.UNARY, "-", 100, "NUMBER_*") {
- public Number evaluate(final TreeToken token) {
- return -1 * token.getChildren().get(0).evaluate().floatValue();
- }
- },
-
- OP_PLUS(TokenTypeArity.BINARY, "\\+", 7, "NUMBER_*", "BRACKET_OPEN") {
- public Number evaluate(final TreeToken token) {
- return token.getChildren().get(0).evaluate().floatValue()
- + token.getChildren().get(1).evaluate().floatValue();
- }
- },
-
- OP_MINUS(TokenTypeArity.BINARY, "-", 6, "NUMBER_*", "BRACKET_OPEN") {
- public Number evaluate(final TreeToken token) {
- return token.getChildren().get(0).evaluate().floatValue()
- - token.getChildren().get(1).evaluate().floatValue();
- }
- },
-
- OP_MULT(TokenTypeArity.BINARY, "(?=\\()|\\*", 9, "NUMBER_*", "BRACKET_OPEN") {
- public Number evaluate(final TreeToken token) {
- return token.getChildren().get(0).evaluate().floatValue()
- * token.getChildren().get(1).evaluate().floatValue();
- }
- },
-
- OP_DIVIDE(TokenTypeArity.BINARY, "/", 10, "NUMBER_*", "BRACKET_OPEN") {
- public Number evaluate(final TreeToken token) {
- return token.getChildren().get(0).evaluate().floatValue()
- / token.getChildren().get(1).evaluate().floatValue();
- }
- },
-
- OP_MOD(TokenTypeArity.BINARY, "%", 8, "NUMBER_*", "BRACKET_OPEN") {
- public Number evaluate(final TreeToken token) {
- return token.getChildren().get(0).evaluate().floatValue()
- % token.getChildren().get(1).evaluate().floatValue();
- }
- },
-
- OP_POWER(TokenTypeArity.BINARY, "\\^", 11, "NUMBER_*", "BRACKET_OPEN") {
- public Number evaluate(final TreeToken token) {
- return new Float(Math.pow(token.getChildren().get(0).evaluate().doubleValue(),
- token.getChildren().get(1).evaluate().doubleValue()));
- }
- },
- ;
-
- private final String[] strfollows;
- private final int precedence;
- private List<TokenType> follows;
- private final Pattern regex;
- private final TokenTypeArity arity;
-
- TokenType(final TokenTypeArity arity, final String regex,
- final int precedence, final String ... follows) {
- this.arity = arity;
- this.strfollows = follows;
- this.precedence = precedence;
- this.regex = Pattern.compile(regex);
- }
-
- public synchronized List<TokenType> getFollowers() {
- if (follows == null) {
- follows = new ArrayList<TokenType>();
-
- for (int i = 0; i < strfollows.length; i++) {
- follows.addAll(searchValueOf(strfollows[i]));
- }
- }
-
- return follows;
- }
-
- public TokenTypeArity getArity() {
- return arity;
- }
-
- public int getPrecedence() {
- return precedence;
- }
-
- public int match(final String input, final int offset) {
- final Matcher matcher = regex.matcher(input);
- matcher.useAnchoringBounds(false);
- matcher.useTransparentBounds(true);
-
- return matcher.find(offset) && matcher.start() == offset ? matcher.end() : -1;
- }
-
- public Number evaluate(final TreeToken token) {
- throw new AbstractMethodError("Can't evaluate this token type");
- }
-
- /**
- *
- * @param name
- * @return
- */
- protected static List<TokenType> searchValueOf(final String name) {
- final List<TokenType> res = new ArrayList<TokenType>();
-
- for (TokenType token : values()) {
- if ((name.endsWith("*")
- && token.name().startsWith(name.substring(0, name.length() - 1)))
- || name.equals(token.name())) {
- res.add(token);
- }
- }
-
- return res;
- }
- }
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