/*
* Copyright 2012 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Eclipse Public License version 1.0, available at
* http://www.eclipse.org/legal/epl-v10.html
*/
package org.jboss.aesh.extensions.text.highlight.scanner;
import org.jboss.aesh.extensions.text.highlight.Encoder;
import org.jboss.aesh.extensions.text.highlight.Scanner;
import org.jboss.aesh.extensions.text.highlight.StringScanner;
import org.jboss.aesh.extensions.text.highlight.TokenType;
import org.jboss.aesh.extensions.text.highlight.WordList;
import org.jboss.aesh.extensions.text.highlight.scanner.java.BuiltInTypes;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.MatchResult;
import java.util.regex.Pattern;
/*
* Based on https://github.com/rubychan/coderay/blob/master/lib/coderay/scanners/java.rb
* Last update sha: 1cdf0e17af6c280dc12130a9200d8196b056bbe9
*/
public class JavaScanner implements Scanner {
public static final Pattern SPACE = Pattern.compile("\\s+|\\n");
public static final Pattern COMMENT = Pattern.compile(
"// [^\\n\\\\]* (?: \\\\. [^\\n\\\\]* )* | /\\* (?: .*? \\*/ | .* )", Pattern.DOTALL | Pattern.COMMENTS);
public static final Pattern IDENT = Pattern.compile("[a-zA-Z_][A-Za-z_0-9]*");
public static final Pattern OPERATORS = Pattern
.compile("\\.(?!\\d)|[,?:()\\[\\]}]|--|\\+\\+|&&|\\|\\||\\*\\*=?|[-+*\\/%^~&|<>=!]=?|<<<?=?|>>>?=?");
public static final Pattern STRING_CONTENT_PATTERN_SINGLE = Pattern.compile("[^\\\\']+");
public static final Pattern STRING_CONTENT_PATTERN_DOUBLE = Pattern.compile("[^\\\\\"]+");
public static final Pattern STRING_CONTENT_PATTERN_MULTI_LINE = Pattern.compile("[^\\\\\\/]+");
public static final Pattern ESCAPE = Pattern.compile("[bfnrtv\\n\\\\'\"]|x[a-fA-F0-9]{1,2}|[0-7]{1,3}");
public static final Pattern UNICODE_ESCAPE = Pattern.compile("u[a-fA-F0-9]{4}|U[a-fA-F0-9]{8}");
public static final Pattern ANNOTATION = Pattern.compile("@" + IDENT.pattern());
public static final Pattern PACKAGE = Pattern.compile(IDENT.pattern() + "(?:\\." + IDENT.pattern() + ")*");
public static final Pattern IDENT_OR_ARRAY_TYPE = Pattern.compile(IDENT.pattern() + "|\\[\\]");
public static final Pattern SEMI_COLON = Pattern.compile(";");
public static final Pattern OPEN_BRAKCET = Pattern.compile("\\{");
public static final Pattern ANY_WORD = Pattern.compile("[\\d.]");
public static final Pattern HEX = Pattern.compile("0[xX][0-9A-Fa-f]+");
public static final Pattern OCTAL = Pattern.compile("(?>0[0-7]+)(?![89.eEfF])");
public static final Pattern FLOAT = Pattern
.compile("\\d+[fFdD]|\\d*\\.\\d+(?:[eE][+-]?\\d+)?[fFdD]?|\\d+[eE][+-]?\\d+[fFdD]?");
public static final Pattern INTEGER = Pattern.compile("\\d+[lL]?");
public static final Pattern START_STRING = Pattern.compile("[\"']");
public static final Pattern END_STRING = Pattern.compile("[\"'\\/]");
public static final Pattern STRING_CONTENT = Pattern.compile(
"\\\\(?:" + ESCAPE.pattern() + "|" + UNICODE_ESCAPE.pattern() + ")", Pattern.DOTALL);
public static final Pattern STRING_CONTENT_2 = Pattern.compile("\\\\.", Pattern.DOTALL);
public static final Pattern END_GROUP = Pattern.compile("\\\\|$");
public enum State {
initial,
string
}
public static final String[] KEYWORDS = new String[]{
"assert", "break", "case", "catch", "continue", "default", "do", "else",
"finally", "for", "if", "instanceof", "import", "new", "package",
"return", "switch", "throw", "try", "typeof", "while", "debugger", "export"};
public static final String[] RESERVED = new String[]{
"const", "goto"};
public static final String[] CONSTANTS = new String[]{
"false", "null", "true"};
public static final String[] MAGIC_VARIABLES = new String[]{
"this", "super"};
public static final String[] TYPES = new String[]{
"boolean", "byte", "char", "class", "double", "enum", "float", "int",
"interface", "long", "short", "void", "[]"};
public static final String[] DIRECTIVES = new String[]{
"abstract", "extends", "final", "implements", "native", "private",
"protected", "public", "static", "strictfp", "synchronized", "throws",
"transient", "volatile"};
public static final WordList<TokenType> IDENT_KIND = new WordList<TokenType>(TokenType.ident)
.add(KEYWORDS, TokenType.keyword)
.add(RESERVED, TokenType.reserved)
.add(CONSTANTS, TokenType.predefined_constant)
.add(MAGIC_VARIABLES, TokenType.local_variable)
.add(TYPES, TokenType.type)
.add(BuiltInTypes.PREDEFINED_TYPES, TokenType.predefined_type)
.add(BuiltInTypes.EXCEPTION_TYPES, TokenType.exception)
.add(DIRECTIVES, TokenType.directive);
public static final Map<String, Pattern> STRING_CONTENT_PATTERN = new HashMap<String, Pattern>();
{
STRING_CONTENT_PATTERN.put("'", STRING_CONTENT_PATTERN_SINGLE);
STRING_CONTENT_PATTERN.put("\"", STRING_CONTENT_PATTERN_DOUBLE);
STRING_CONTENT_PATTERN.put("/", STRING_CONTENT_PATTERN_MULTI_LINE);
}
public static final Type TYPE = new Type("JAVA", "\\.(java)$");
@Override
public Type getType() {
return TYPE;
}
@Override
public void scan(StringScanner source, Encoder encoder, Map<String, Object> options) {
State state = State.initial;
String string_delimiter = null;
TokenType package_name_expected = null;
boolean class_name_follows = false;
boolean last_token_dot = false;
while (source.hasMore()) {
MatchResult m = null;
switch (state) {
case initial:
if ((m = source.scan(SPACE)) != null) {
encoder.textToken(m.group(), TokenType.space);
continue;
} else if ((m = source.scan(COMMENT)) != null) {
encoder.textToken(m.group(), TokenType.comment);
continue;
} else if (package_name_expected != null && (m = source.scan(PACKAGE)) != null) {
encoder.textToken(m.group(), package_name_expected);
} else if ((m = source.scan(IDENT_OR_ARRAY_TYPE)) != null) {
String match = m.group();
TokenType kind = IDENT_KIND.lookup(match);
if (last_token_dot) {
kind = TokenType.ident;
} else if (class_name_follows) {
kind = TokenType.class_;
class_name_follows = false;
} else {
if ("import".equals(match)) {
package_name_expected = TokenType.include;
} else if ("package".equals(match)) {
package_name_expected = TokenType.namespace;
} else if ("class".equals(match) || "interface".equals(match)) {
class_name_follows = true;
}
}
encoder.textToken(match, kind);
} else if ((m = source.scan(OPERATORS)) != null) {
encoder.textToken(m.group(), TokenType.operator);
} else if ((m = source.scan(SEMI_COLON)) != null) {
package_name_expected = null;
encoder.textToken(m.group(), TokenType.operator);
} else if ((m = source.scan(OPEN_BRAKCET)) != null) {
class_name_follows = false;
encoder.textToken(m.group(), TokenType.operator);
} else if ((m = source.check(ANY_WORD)) != null) {
if ((m = source.scan(HEX)) != null) {
encoder.textToken(m.group(), TokenType.hex);
} else if ((m = source.scan(OCTAL)) != null) {
encoder.textToken(m.group(), TokenType.octal);
} else if ((m = source.scan(FLOAT)) != null) {
encoder.textToken(m.group(), TokenType.float_);
} else if ((m = source.scan(INTEGER)) != null) {
encoder.textToken(m.group(), TokenType.integer);
}
} else if ((m = source.scan(START_STRING)) != null) {
state = State.string;
encoder.beginGroup(TokenType.string);
string_delimiter = m.group();
encoder.textToken(m.group(), TokenType.delimiter);
} else if ((m = source.scan(ANNOTATION)) != null) {
encoder.textToken(m.group(), TokenType.annotation);
} else {
encoder.textToken(source.next(), TokenType.error);
}
break;
case string:
if ((m = source.scan(STRING_CONTENT_PATTERN.get(string_delimiter))) != null) {
encoder.textToken(m.group(), TokenType.content);
} else if ((m = source.scan(END_STRING)) != null) {
encoder.textToken(m.group(), TokenType.delimiter);
encoder.endGroup(TokenType.string);
state = State.initial;
string_delimiter = null;
} else if (state == State.string && (m = source.scan(STRING_CONTENT)) != null) {
if ("'".equals(string_delimiter) && !("\\\\".equals(m.group()) || "\\'".equals(m.group()))) {
encoder.textToken(m.group(), TokenType.content);
} else {
encoder.textToken(m.group(), TokenType.char_);
}
} else if ((m = source.scan(STRING_CONTENT_2)) != null) {
encoder.textToken(m.group(), TokenType.content);
} else if ((m = source.scan(END_GROUP)) != null) {
encoder.endGroup(TokenType.string);
state = State.initial;
if (!m.group().isEmpty()) {
encoder.textToken(m.group(), TokenType.error);
}
} else {
throw new RuntimeException("else case \" reached; " + source.peek(1) + " in " + getClass());
}
break;
default:
throw new RuntimeException("unknown state " + state);
}
if (m != null) {
last_token_dot = (".".equals(m.group()));
}
}
if (state == State.string) {
encoder.endGroup(TokenType.string);
}
}
}