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Current File : /var/www/vhosts/pcu.in.th/api-uat.pcu.in.th/node_modules/eslint/lib/rules//lines-between-class-members.js
/**
 * @fileoverview Rule to check empty newline between class members
 * @author 薛定谔的猫<hh_2013@foxmail.com>
 * @deprecated in ESLint v8.53.0
 */
"use strict";

//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------

const astUtils = require("./utils/ast-utils");

//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------

/**
 * Types of class members.
 * Those have `test` method to check it matches to the given class member.
 * @private
 */
const ClassMemberTypes = {
    "*": { test: () => true },
    field: { test: node => node.type === "PropertyDefinition" },
    method: { test: node => node.type === "MethodDefinition" }
};

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

/** @type {import('../shared/types').Rule} */
module.exports = {
    meta: {
        deprecated: true,
        replacedBy: [],
        type: "layout",

        docs: {
            description: "Require or disallow an empty line between class members",
            recommended: false,
            url: "https://eslint.org/docs/latest/rules/lines-between-class-members"
        },

        fixable: "whitespace",

        schema: [
            {
                anyOf: [
                    {
                        type: "object",
                        properties: {
                            enforce: {
                                type: "array",
                                items: {
                                    type: "object",
                                    properties: {
                                        blankLine: { enum: ["always", "never"] },
                                        prev: { enum: ["method", "field", "*"] },
                                        next: { enum: ["method", "field", "*"] }
                                    },
                                    additionalProperties: false,
                                    required: ["blankLine", "prev", "next"]
                                },
                                minItems: 1
                            }
                        },
                        additionalProperties: false,
                        required: ["enforce"]
                    },
                    {
                        enum: ["always", "never"]
                    }
                ]
            },
            {
                type: "object",
                properties: {
                    exceptAfterSingleLine: {
                        type: "boolean",
                        default: false
                    }
                },
                additionalProperties: false
            }
        ],
        messages: {
            never: "Unexpected blank line between class members.",
            always: "Expected blank line between class members."
        }
    },

    create(context) {

        const options = [];

        options[0] = context.options[0] || "always";
        options[1] = context.options[1] || { exceptAfterSingleLine: false };

        const configureList = typeof options[0] === "object" ? options[0].enforce : [{ blankLine: options[0], prev: "*", next: "*" }];
        const sourceCode = context.sourceCode;

        /**
         * Gets a pair of tokens that should be used to check lines between two class member nodes.
         *
         * In most cases, this returns the very last token of the current node and
         * the very first token of the next node.
         * For example:
         *
         *     class C {
         *         x = 1;   // curLast: `;` nextFirst: `in`
         *         in = 2
         *     }
         *
         * There is only one exception. If the given node ends with a semicolon, and it looks like
         * a semicolon-less style's semicolon - one that is not on the same line as the preceding
         * token, but is on the line where the next class member starts - this returns the preceding
         * token and the semicolon as boundary tokens.
         * For example:
         *
         *     class C {
         *         x = 1    // curLast: `1` nextFirst: `;`
         *         ;in = 2
         *     }
         * When determining the desired layout of the code, we should treat this semicolon as
         * a part of the next class member node instead of the one it technically belongs to.
         * @param {ASTNode} curNode Current class member node.
         * @param {ASTNode} nextNode Next class member node.
         * @returns {Token} The actual last token of `node`.
         * @private
         */
        function getBoundaryTokens(curNode, nextNode) {
            const lastToken = sourceCode.getLastToken(curNode);
            const prevToken = sourceCode.getTokenBefore(lastToken);
            const nextToken = sourceCode.getFirstToken(nextNode); // skip possible lone `;` between nodes

            const isSemicolonLessStyle = (
                astUtils.isSemicolonToken(lastToken) &&
                !astUtils.isTokenOnSameLine(prevToken, lastToken) &&
                astUtils.isTokenOnSameLine(lastToken, nextToken)
            );

            return isSemicolonLessStyle
                ? { curLast: prevToken, nextFirst: lastToken }
                : { curLast: lastToken, nextFirst: nextToken };
        }

        /**
         * Return the last token among the consecutive tokens that have no exceed max line difference in between, before the first token in the next member.
         * @param {Token} prevLastToken The last token in the previous member node.
         * @param {Token} nextFirstToken The first token in the next member node.
         * @param {number} maxLine The maximum number of allowed line difference between consecutive tokens.
         * @returns {Token} The last token among the consecutive tokens.
         */
        function findLastConsecutiveTokenAfter(prevLastToken, nextFirstToken, maxLine) {
            const after = sourceCode.getTokenAfter(prevLastToken, { includeComments: true });

            if (after !== nextFirstToken && after.loc.start.line - prevLastToken.loc.end.line <= maxLine) {
                return findLastConsecutiveTokenAfter(after, nextFirstToken, maxLine);
            }
            return prevLastToken;
        }

        /**
         * Return the first token among the consecutive tokens that have no exceed max line difference in between, after the last token in the previous member.
         * @param {Token} nextFirstToken The first token in the next member node.
         * @param {Token} prevLastToken The last token in the previous member node.
         * @param {number} maxLine The maximum number of allowed line difference between consecutive tokens.
         * @returns {Token} The first token among the consecutive tokens.
         */
        function findFirstConsecutiveTokenBefore(nextFirstToken, prevLastToken, maxLine) {
            const before = sourceCode.getTokenBefore(nextFirstToken, { includeComments: true });

            if (before !== prevLastToken && nextFirstToken.loc.start.line - before.loc.end.line <= maxLine) {
                return findFirstConsecutiveTokenBefore(before, prevLastToken, maxLine);
            }
            return nextFirstToken;
        }

        /**
         * Checks if there is a token or comment between two tokens.
         * @param {Token} before The token before.
         * @param {Token} after The token after.
         * @returns {boolean} True if there is a token or comment between two tokens.
         */
        function hasTokenOrCommentBetween(before, after) {
            return sourceCode.getTokensBetween(before, after, { includeComments: true }).length !== 0;
        }

        /**
         * Checks whether the given node matches the given type.
         * @param {ASTNode} node The class member node to check.
         * @param {string} type The class member type to check.
         * @returns {boolean} `true` if the class member node matched the type.
         * @private
         */
        function match(node, type) {
            return ClassMemberTypes[type].test(node);
        }

        /**
         * Finds the last matched configuration from the configureList.
         * @param {ASTNode} prevNode The previous node to match.
         * @param {ASTNode} nextNode The current node to match.
         * @returns {string|null} Padding type or `null` if no matches were found.
         * @private
         */
        function getPaddingType(prevNode, nextNode) {
            for (let i = configureList.length - 1; i >= 0; --i) {
                const configure = configureList[i];
                const matched =
                    match(prevNode, configure.prev) &&
                    match(nextNode, configure.next);

                if (matched) {
                    return configure.blankLine;
                }
            }
            return null;
        }

        return {
            ClassBody(node) {
                const body = node.body;

                for (let i = 0; i < body.length - 1; i++) {
                    const curFirst = sourceCode.getFirstToken(body[i]);
                    const { curLast, nextFirst } = getBoundaryTokens(body[i], body[i + 1]);
                    const isMulti = !astUtils.isTokenOnSameLine(curFirst, curLast);
                    const skip = !isMulti && options[1].exceptAfterSingleLine;
                    const beforePadding = findLastConsecutiveTokenAfter(curLast, nextFirst, 1);
                    const afterPadding = findFirstConsecutiveTokenBefore(nextFirst, curLast, 1);
                    const isPadded = afterPadding.loc.start.line - beforePadding.loc.end.line > 1;
                    const hasTokenInPadding = hasTokenOrCommentBetween(beforePadding, afterPadding);
                    const curLineLastToken = findLastConsecutiveTokenAfter(curLast, nextFirst, 0);
                    const paddingType = getPaddingType(body[i], body[i + 1]);

                    if (paddingType === "never" && isPadded) {
                        context.report({
                            node: body[i + 1],
                            messageId: "never",

                            fix(fixer) {
                                if (hasTokenInPadding) {
                                    return null;
                                }
                                return fixer.replaceTextRange([beforePadding.range[1], afterPadding.range[0]], "\n");
                            }
                        });
                    } else if (paddingType === "always" && !skip && !isPadded) {
                        context.report({
                            node: body[i + 1],
                            messageId: "always",

                            fix(fixer) {
                                if (hasTokenInPadding) {
                                    return null;
                                }
                                return fixer.insertTextAfter(curLineLastToken, "\n");
                            }
                        });
                    }

                }
            }
        };
    }
};

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