/**
 * Copyright 2017 Matt Acosta
 *
 * Licensed under the Apache 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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { PhpVersion } from './PhpVersion';
/**
 * A list of character codes.
 */
export declare const enum Character {
    Null = 0,
    Backspace = 8,
    Tab = 9,
    LineFeed = 10,
    VerticalTab = 11,
    FormFeed = 12,
    CarriageReturn = 13,
    Space = 32,
    Exclamation = 33,
    DoubleQuote = 34,
    Hash = 35,
    Dollar = 36,
    Percent = 37,
    Ampersand = 38,
    SingleQuote = 39,
    OpenParen = 40,
    CloseParen = 41,
    Asterisk = 42,
    Plus = 43,
    Comma = 44,
    Minus = 45,
    Period = 46,
    Slash = 47,
    _0 = 48,
    _1 = 49,
    _2 = 50,
    _3 = 51,
    _4 = 52,
    _5 = 53,
    _6 = 54,
    _7 = 55,
    _8 = 56,
    _9 = 57,
    Colon = 58,
    Semicolon = 59,
    LessThan = 60,
    Equal = 61,
    GreaterThan = 62,
    Question = 63,
    At = 64,
    A = 65,
    B = 66,
    C = 67,
    D = 68,
    E = 69,
    F = 70,
    G = 71,
    H = 72,
    I = 73,
    J = 74,
    K = 75,
    L = 76,
    M = 77,
    N = 78,
    O = 79,
    P = 80,
    Q = 81,
    R = 82,
    S = 83,
    T = 84,
    U = 85,
    V = 86,
    W = 87,
    X = 88,
    Y = 89,
    Z = 90,
    OpenBracket = 91,
    Backslash = 92,
    CloseBracket = 93,
    Caret = 94,
    Underscore = 95,
    BackQuote = 96,
    a = 97,
    b = 98,
    c = 99,
    d = 100,
    e = 101,
    f = 102,
    g = 103,
    h = 104,
    i = 105,
    j = 106,
    k = 107,
    l = 108,
    m = 109,
    n = 110,
    o = 111,
    p = 112,
    q = 113,
    r = 114,
    s = 115,
    t = 116,
    u = 117,
    v = 118,
    w = 119,
    x = 120,
    y = 121,
    z = 122,
    OpenBrace = 123,
    VerticalBar = 124,
    CloseBrace = 125,
    Tilde = 126,
    Delete = 127
}
/**
 * Defines the language-specific characteristics of certain characters.
 */
export declare class CharacterInfo {
    /**
     * Determines if a character is a binary digit (0-1).
     */
    static isBinDigit(ch: number): boolean;
    /**
     * Determines if a character is a digit (0-9).
     */
    static isDigit(ch: number): boolean;
    /**
     * Determines if a character is a valid escape sequence in a double-quoted
     * string. The escape sequence may still be valid if it consists of multiple
     * characters however.
     */
    static isDoubleQuoteEscape(ch: number): boolean;
    /**
     * Determines if a character is a hexadecimal digit (0-9, A-F).
     */
    static isHexDigit(ch: number): boolean;
    /**
     * Determines if the character may be part of an identifier.
     *
     * This is similar to `isIdentifierStart()` but allows for digits.
     */
    static isIdentifierPart(ch: number, languageVersion?: PhpVersion): boolean;
    /**
     * Determines if a character may start an identifier.
     */
    static isIdentifierStart(ch: number, languageVersion?: PhpVersion): boolean;
    /**
     * Determines if a character is a line break (CR or LF).
     */
    static isLineBreak(ch: number): boolean;
    /**
     * Determines if a character is an octal digit (0-7).
     */
    static isOctDigit(ch: number): boolean;
    /**
     * Determines if a character is a valid escape sequence in a single-quoted
     * string.
     */
    static isSingleQuoteEscape(ch: number): boolean;
    /**
     * Determines if a character is whitespace (but not a line break).
     */
    static isWhitespace(ch: number): boolean;
    /**
     * Determines if a character is whitespace or a line break.
     */
    static isWhitespaceLike(ch: number): boolean;
}