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/*
***** BEGIN LICENSE BLOCK *****
* Version: EPL 2.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Eclipse Public
* License Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.eclipse.org/legal/epl-v20.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Copyright (C) 2001-2002 Jan Arne Petersen <jpetersen@uni-bonn.de>
* Copyright (C) 2007 William N Dortch <bill.dortch@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the EPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the EPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****/
package org.jruby.util;
import org.jcodings.Config;
import org.jcodings.Encoding;
import org.jcodings.IntHolder;
import org.jcodings.unicode.UnicodeCodeRange;
import org.jruby.Ruby;
import org.jruby.RubySymbol;
import org.jruby.runtime.builtin.IRubyObject;
public final class IdUtil {
/**
* rb_is_const_id and is_const_id
*/
public static boolean isConstant(String id) {
return Character.isUpperCase(id.charAt(0));
}
/**
* rb_is_class_id and is_class_id
*/
public static boolean isClassVariable(String id) {
return id.length() > 1 && id.charAt(0) == '@' && id.charAt(1) == '@';
}
/**
* rb_is_instance_id and is_instance_id
*/
public static boolean isInstanceVariable(String id) {
return id.length() > 0 && id.charAt(0) == '@' && (id.length() < 2 || id.charAt(1) != '@');
}
/**
* rb_is_global_id and is_global_id
*/
public static boolean isGlobal(String id) {
return id.length()>0 && id.charAt(0) == '$';
}
public static boolean isPredicate(String id) {
return id.endsWith("?");
}
/**
* We store IR special variables (e.g. %block) in scope and we want reflective Ruby methods to
* not see these since they are not real variables...they're special.
*/
public static boolean isSpecial(String id) {
return id.startsWith("%");
}
public static boolean isAttrSet(String id) {
return id.endsWith("=");
}
public static boolean isValidConstantName(String id) {
char c;
int len;
if ((len = id.length()) > 0 && (c = id.charAt(0)) <= 'Z' && c >= 'A') {
return isNameString(id, 1, len);
}
return false;
}
public static boolean isValidConstantName(IRubyObject id) {
if (id instanceof RubySymbol sym) {
return sym.validConstantName();
} else {
return isValidConstantName(id.asJavaString());
}
}
public static boolean isValidInstanceVariableName(String id) {
int len;
if ((len = id.length()) > 1 && '@' == id.charAt(0)) {
if (isInitialCharacter(id.charAt(1))) {
return isNameString(id, 2, len);
}
}
return false;
}
public static boolean isValidClassVariableName(String id) {
int len;
if ((len = id.length()) > 2 && '@' == id.charAt(0) && '@' == id.charAt(1)) {
if (isInitialCharacter(id.charAt(2))) {
return isNameString(id, 3, len);
}
}
return false;
}
public static boolean isInitialCharacter(int c) {
return Character.isAlphabetic(c) || c == '_';
}
public static boolean isNameCharacter(char c) {
return Character.isLetterOrDigit(c) || c == '_';
}
public static boolean isNameString(String id, int start, int limit) {
for (int i = start; i < limit; i++) {
if (!isNameCharacter(id.charAt(i))) {
return false;
}
}
return true;
}
/**
* Check the syntax of a Ruby variable, including that it's longer
* than zero characters, and starts with either an @ or a capital
* letter.
*/
public static final boolean isRubyVariable(String name) {
char c;
return name.length() > 0 && ((c = name.charAt(0)) == '@' || (c <= 'Z' && c >= 'A'));
}
// MRI: rb_sym_constant_char_p
public static boolean isConstantInitial(ByteList byteList) {
int c, len;
int nlen = byteList.realSize();
Encoding enc = byteList.getEncoding();
if (nlen < 1) return false;
int byte0 = byteList.get(0);
if (byte0 < 128) return enc.isUpper(byte0);
byte[] bytes = byteList.getUnsafeBytes();
int begin = byteList.begin();
int end = begin + nlen;
c = StringSupport.preciseLength(enc, bytes, begin, end);
if (!StringSupport.MBCLEN_CHARFOUND_P(c)) return false;
len = StringSupport.MBCLEN_CHARFOUND_LEN(c);
c = StringSupport.codePoint(enc, bytes, begin, end);
if (enc.isUnicode()) {
if (enc.isUpper(c)) return true;
if (enc.isLower(c)) return false;
if (enc.isCodeCType(c, UnicodeCodeRange.TITLECASELETTER.getCType())) return true;
} else {
/* fallback to case-folding */
IntHolder holder = new IntHolder();
holder.value = begin;
byte[] fold = new byte[Config.ENC_GET_CASE_FOLD_CODES_MAX_NUM];
int r = enc.mbcCaseFold(Config.CASE_FOLD, bytes, holder, end, fold);
if (r > 0 && (r != len || ByteList.memcmp(fold, 0, bytes, begin, r) != 0))
return true;
}
return false;
}
// mri: rb_enc_symname_type (minus support for allowed_attrset).
public static SymbolNameType determineSymbolNameType(Ruby runtime, ByteList data) {
Encoding encoding = data.getEncoding();
if (!encoding.isAsciiCompatible()) return SymbolNameType.OTHER;
if (data.isEmpty()) return SymbolNameType.OTHER;
int length = data.length();
SymbolNameType type = SymbolNameType.OTHER;
boolean idCheck = false;
int m = 0;
int e = length - 1; // last available index (MRI is \0)
switch ((byte) data.get(m)) {
case 0:
return SymbolNameType.OTHER;
case '$':
type = SymbolNameType.GLOBAL;
m++;
if (m < e && isSpecialGlobalName((byte) data.get(m))) return type;
idCheck = true;
break;
case '@':
type = SymbolNameType.INSTANCE;
m++;
if (m < e && data.get(m) == '@') {
m++;
type = SymbolNameType.CLASS;
}
idCheck = true;
break;
case '<':
m++;
if (m < e) {
switch (data.get(m)) {
case '<':
m++;
break;
case '=':
m++;
if (m < e && data.get(m) == '>') m++;
break;
default:
break;
}
}
break;
case '>':
m++;
if (m < e) {
switch (data.get(m)) {
case '>':
case '=':
m++;
break;
}
}
break;
case '=':
m++;
if (m < e) {
switch (data.get(m)) {
case '~':
m++;
break;
case '=':
m++;
if (m < e && data.get(m + 1) == '=') m++;
break;
default:
return SymbolNameType.OTHER;
}
}
break;
case '*':
m++;
if (m < e && data.get(m + 1) == '*') m++;
break;
case '+':
case '-':
m++;
if (m < e && data.get(m + 1) == '@') m++;
break;
case '|':
case '^':
case '&':
case '/':
case '%':
case '~':
case '`':
m++;
break;
case '[':
m++;
if (m < e && data.get(m) != ']') { // wtf
idCheck = true;
break;
}
m++; // []
if (m < e && data.get(m + 1) != '=') m++; // []=
break;
case '!':
m++;
if (length == 1) return SymbolNameType.JUNK;
switch (data.get(m)) {
case '=':
case '~':
m++;
break;
default:
return SymbolNameType.OTHER;
}
break;
default:
type = isConstantInitial(data) ? SymbolNameType.CONST : SymbolNameType.LOCAL;
idCheck = true;
break;
}
if (idCheck) {
// single byte is ok here for isAlpha because we verify it is proper ascii byte.
if (m > e || (data.get(m) != '_' && encoding.isMbcAscii((byte) data.get(m)) && !encoding.isAlpha(data.get(m)))) {
if (length > 1 && data.get(length - 1) == '=') {
ByteList chopped = new ByteList(data.unsafeBytes(), data.begin(), length - 1, data.getEncoding(), false);
type = determineSymbolNameType(runtime, chopped);
if (type != SymbolNameType.ATTRSET) return SymbolNameType.ATTRSET;
}
return SymbolNameType.OTHER;
}
m = ByteListHelper.eachCodePointWhile(runtime, data, m, (index, codepoint, enc) ->
enc.isAlnum(codepoint) || codepoint == '_' || !Encoding.isAscii(codepoint));
if (m > e) return type;
switch (data.get(m)) {
case '!':
case '?':
if (type == SymbolNameType.GLOBAL || type == SymbolNameType.CLASS || type == SymbolNameType.INSTANCE) return SymbolNameType.OTHER;
type = SymbolNameType.JUNK;
m++;
if (m + 1 < e || m >= e || data.get(m) != '=') break;
// fall through
case '=':
return SymbolNameType.ATTRSET;
}
}
return m == e + 1 ? type : SymbolNameType.OTHER;
}
private static int BIT(int c, int index) {
return c / 31 - 1 == index ? 1 << (c % 32) : 0;
}
private static int globalPunctuationBits[] = new int[((0x7e - 0x20) + 31) / 32];
private static int SPECIAL_PUNCT(int idx){
return BIT('~', idx) | BIT('*', idx) | BIT('$', idx) | BIT('?', idx) |
BIT('!', idx) | BIT('@', idx) | BIT('/', idx) | BIT('\\', idx) |
BIT(';', idx) | BIT(',', idx) | BIT('.', idx) | BIT('=', idx) |
BIT(':', idx) | BIT('<', idx) | BIT('>', idx) | BIT('\"', idx) |
BIT('&', idx) | BIT('`', idx) | BIT('\'', idx) | BIT('+', idx) |
BIT('0', idx);
}
private static final int[] globalNamePunctuationBits = new int[] {SPECIAL_PUNCT(0), SPECIAL_PUNCT(1), SPECIAL_PUNCT(2)};
private static boolean isSpecialGlobalName(byte c) {
if (c <= 0x20 || 0x72 < c) return false;
return (globalNamePunctuationBits[(c - 0x20) / 32] >> (c % 32) & 1) != 0;
}
}