Code coverage report for lib/analyse.js

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/**
 * @file 分析有 diff 的行
 * @author chris<wfsr@foxmail.com>
 */
 
/**
 * 新文件的标志
 *
 * @const
 * @type {string}
 */
'use strict';
 
Object.defineProperty(exports, '__esModule', {
    value: true
});
var NEW_FILE_MODE = 'new file mode';
 
/**
 * 匹配 diff 中的行数的正则
 *
 * @const
 * @type {RegExp}
 */
var CHANGED_LINE_REG = /^@@ \-\d+,\d+ \+(\d+),(\d+) @@/;
 
/**
 * 是否新增文件
 *
 * @param {string} diffs diff 输出的字符
 * @return {boolean}  是否新增加文件的结果
 */
var isNewFile = function isNewFile(diffs) {
    var secondLine = diffs.indexOf('\n');
    return diffs.substr(secondLine + 1, NEW_FILE_MODE.length) === NEW_FILE_MODE;
};
 
/**
 * 从 diff 输出中解释出有改变的行数及适用于 `fecs --lines` 过滤的 range
 *
 * @param {string} diffs  diff 的输出字符
 * @param {boolean} isNew 是否新文件
 * @return {Object} 包含变更行数 lines 及 range 的对象
 */
function parse(diffs, isNew) {
    diffs = diffs.slice(diffs.indexOf('@@')).split(/\r?\n/);
 
    var lines = 0;
    var range = [];
    var line = undefined;
    var index = undefined;
    var last = undefined;
    var section = undefined;
 
    function push() {
        if (!section || !section[0]) {
            return;
        }
 
        if (section[1]) {
            Eif (section[1] - section[0] < 2) {
                range.push(section[0]);
                range.push(section[1]);
            } else {
                range.push('[' + section + ']');
            }
        } else {
            range.push(section[0]);
        }
 
        section.length = 0;
    }
 
    while ((line = diffs.shift()) != null) {
        var match = line.match(CHANGED_LINE_REG);
        if (match) {
            Iif (isNew) {
                lines = match[2] | 0;
                break;
            }
            index = match[1] | 0;
        } else {
            switch (line[0]) {
                case '-':
                    break;
                case '+':
                    if (last) {
                        section[1] = index + '';
                    } else {
                        section = [index + ''];
                    }
                    last = index;
                    lines++;
                    index++;
                    break;
                default:
                    index++;
                    last = 0;
                    push();
                    break;
            }
        }
    }
 
    Eif (section && section.length) {
        push();
    }
 
    return { lines: lines, range: range };
}
 
/**
 * 从 diff 输出中分析
 *
 * @param {string} diffs diff 的输出
 * @return {Object} 包含变更行数 lines 及 range 的对象
 */
 
exports['default'] = function (diffs) {
    var isNew = isNewFile(diffs);
    return parse(diffs, isNew);
};
 
module.exports = exports['default'];
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