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-rw-r--r--dev/css-to-json-util.js172
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diff --git a/dev/css-to-json-util.js b/dev/css-to-json-util.js
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-/*
- * Copyright (C) 2023 Yomitan Authors
- * Copyright (C) 2021-2022 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/>.
- */
-
-const fs = require('fs');
-const css = require('css');
-
-function indexOfRule(rules, selectors) {
- const jj = selectors.length;
- for (let i = 0, ii = rules.length; i < ii; ++i) {
- const ruleSelectors = rules[i].selectors;
- if (ruleSelectors.length !== jj) { continue; }
- let okay = true;
- for (let j = 0; j < jj; ++j) {
- if (selectors[j] !== ruleSelectors[j]) {
- okay = false;
- break;
- }
- }
- if (okay) { return i; }
- }
- return -1;
-}
-
-function removeProperty(styles, property, removedProperties) {
- let removeCount = removedProperties.get(property);
- if (typeof removeCount !== 'undefined') { return removeCount; }
- removeCount = 0;
- for (let i = 0, ii = styles.length; i < ii; ++i) {
- const key = styles[i][0];
- if (key !== property) { continue; }
- styles.splice(i, 1);
- --i;
- --ii;
- ++removeCount;
- }
- removedProperties.set(property, removeCount);
- return removeCount;
-}
-
-function formatRulesJson(rules) {
- // Manually format JSON, for improved compactness
- // return JSON.stringify(rules, null, 4);
- const indent1 = ' ';
- const indent2 = indent1.repeat(2);
- const indent3 = indent1.repeat(3);
- let result = '';
- result += '[';
- let index1 = 0;
- for (const {selectors, styles} of rules) {
- if (index1 > 0) { result += ','; }
- result += `\n${indent1}{\n${indent2}"selectors": `;
- if (selectors.length === 1) {
- result += `[${JSON.stringify(selectors[0], null, 4)}]`;
- } else {
- result += JSON.stringify(selectors, null, 4).replace(/\n/g, '\n' + indent2);
- }
- result += `,\n${indent2}"styles": [`;
- let index2 = 0;
- for (const [key, value] of styles) {
- if (index2 > 0) { result += ','; }
- result += `\n${indent3}[${JSON.stringify(key)}, ${JSON.stringify(value)}]`;
- ++index2;
- }
- if (index2 > 0) { result += `\n${indent2}`; }
- result += `]\n${indent1}}`;
- ++index1;
- }
- if (index1 > 0) { result += '\n'; }
- result += ']';
- return result;
-}
-
-function generateRules(cssFile, overridesCssFile) {
- const content1 = fs.readFileSync(cssFile, {encoding: 'utf8'});
- const content2 = fs.readFileSync(overridesCssFile, {encoding: 'utf8'});
- const stylesheet1 = css.parse(content1, {}).stylesheet;
- const stylesheet2 = css.parse(content2, {}).stylesheet;
-
- const removePropertyPattern = /^remove-property\s+([\w\W]+)$/;
- const removeRulePattern = /^remove-rule$/;
- const propertySeparator = /\s+/;
-
- const rules = [];
-
- // Default stylesheet
- for (const rule of stylesheet1.rules) {
- if (rule.type !== 'rule') { continue; }
- const {selectors, declarations} = rule;
- const styles = [];
- for (const declaration of declarations) {
- if (declaration.type !== 'declaration') { console.log(declaration); continue; }
- const {property, value} = declaration;
- styles.push([property, value]);
- }
- if (styles.length > 0) {
- rules.push({selectors, styles});
- }
- }
-
- // Overrides
- for (const rule of stylesheet2.rules) {
- if (rule.type !== 'rule') { continue; }
- const {selectors, declarations} = rule;
- const removedProperties = new Map();
- for (const declaration of declarations) {
- switch (declaration.type) {
- case 'declaration':
- {
- const index = indexOfRule(rules, selectors);
- let entry;
- if (index >= 0) {
- entry = rules[index];
- } else {
- entry = {selectors, styles: []};
- rules.push(entry);
- }
- const {property, value} = declaration;
- removeProperty(entry.styles, property, removedProperties);
- entry.styles.push([property, value]);
- }
- break;
- case 'comment':
- {
- const index = indexOfRule(rules, selectors);
- if (index < 0) { throw new Error('Could not find rule with matching selectors'); }
- const comment = declaration.comment.trim();
- let m;
- if ((m = removePropertyPattern.exec(comment)) !== null) {
- for (const property of m[1].split(propertySeparator)) {
- const removeCount = removeProperty(rules[index].styles, property, removedProperties);
- if (removeCount === 0) { throw new Error(`Property removal is unnecessary; ${property} does not exist`); }
- }
- } else if (removeRulePattern.test(comment)) {
- rules.splice(index, 1);
- }
- }
- break;
- }
- }
- }
-
- // Remove empty
- for (let i = 0, ii = rules.length; i < ii; ++i) {
- if (rules[i].styles.length > 0) { continue; }
- rules.splice(i, 1);
- --i;
- --ii;
- }
-
- return rules;
-}
-
-
-module.exports = {
- formatRulesJson,
- generateRules
-};