jruby/core/src/main/java/org/jruby/util/IdUtil.java at master · jruby/jruby · GitHub

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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.

* 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;

}

jruby/core/src/main/java/org/jruby/util/IdUtil.java at master · jruby/jruby · GitHub

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jruby/core/src/main/java/org/jruby/util/IdUtil.java at master · jruby/jruby · GitHub

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