/* * Copyright (C) 2021 Yomichan Authors * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <https://www.gnu.org/licenses/>. */ class TemplatePatcher { constructor() { this._diffPattern1 = /\n?\{\{<<<<<<<\}\}\n/g; this._diffPattern2 = /\n\{\{=======\}\}\n/g; this._diffPattern3 = /\n\{\{>>>>>>>\}\}\n*/g; this._lookupMarkerPattern = /[ \t]*\{\{~?>\s*\(\s*lookup\s*\.\s*"marker"\s*\)\s*~?\}\}/g; } parsePatch(content) { const diffPattern1 = this._diffPattern1; const diffPattern2 = this._diffPattern2; const diffPattern3 = this._diffPattern3; const modifications = []; let index = 0; while (true) { // Find modification boundaries diffPattern1.lastIndex = index; const m1 = diffPattern1.exec(content); if (m1 === null) { break; } diffPattern2.lastIndex = m1.index + m1[0].length; const m2 = diffPattern2.exec(content); if (m2 === null) { break; } diffPattern3.lastIndex = m2.index + m2[0].length; const m3 = diffPattern3.exec(content); if (m3 === null) { break; } // Construct const current = content.substring(m1.index + m1[0].length, m2.index); const replacement = content.substring(m2.index + m2[0].length, m3.index); if (current.length > 0) { modifications.push({current, replacement}); } // Update content = content.substring(0, m1.index) + content.substring(m3.index + m3[0].length); index = m1.index; } return {addition: content, modifications}; } applyPatch(template, patch) { for (const {current, replacement} of patch.modifications) { let fromIndex = 0; while (true) { const index = template.indexOf(current, fromIndex); if (index < 0) { break; } template = template.substring(0, index) + replacement + template.substring(index + current.length); fromIndex = index + replacement.length; } } template = this._addFieldTemplatesBeforeEnd(template, patch.addition); return template; } // Private _addFieldTemplatesBeforeEnd(template, addition) { if (addition.length === 0) { return template; } const newline = '\n'; let replaced = false; template = template.replace(this._lookupMarkerPattern, (g0) => { replaced = true; return `${addition}${newline}${g0}`; }); if (!replaced) { template += newline; template += addition; } return template; } }