Example usage for org.antlr.v4.runtime Lexer MIN_CHAR_VALUE

Introduction

In this page you can find the example usage for org.antlr.v4.runtime Lexer MIN_CHAR_VALUE.

Prototype

int MIN_CHAR_VALUE

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Usage

From source file:loghub.configuration.CharSupport.java

License:BSD License

/** Return a string representing the escaped char for code c.  E.g., If c
 *  has value 0x100, you will get "\u0100".  ASCII gets the usual
 *  char (non-hex) representation.  Control characters are spit out
 *  as unicode.  While this is specially set up for returning Java strings,
 *  it can be used by any language target that has the same syntax. :)
 *//*  w ww .j  a va 2s . c om*/
public static String getANTLRCharLiteralForChar(int c) {
    if (c < Lexer.MIN_CHAR_VALUE) {
        return "'<INVALID>'";
    }
    if (c < ANTLRLiteralCharValueEscape.length && ANTLRLiteralCharValueEscape[c] != null) {
        return '\'' + ANTLRLiteralCharValueEscape[c] + '\'';
    }
    if (Character.UnicodeBlock.of((char) c) == Character.UnicodeBlock.BASIC_LATIN
            && !Character.isISOControl((char) c)) {
        if (c == '\\') {
            return "'\\\\'";
        }
        if (c == '\'') {
            return "'\\''";
        }
        return '\'' + Character.toString((char) c) + '\'';
    }
    // turn on the bit above max "\uFFFF" value so that we pad with zeros
    // then only take last 4 digits
    String hex = Integer.toHexString(c | 0x10000).toUpperCase().substring(1, 5);
    String unicodeStr = "'\\u" + hex + "'";
    return unicodeStr;
}

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