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authortoasted-nutbread <toasted-nutbread@users.noreply.github.com>2021-07-17 16:03:26 -0400
committerGitHub <noreply@github.com>2021-07-17 16:03:26 -0400
commit74381302c7a658dc3fd5e6c3a76842dd430341bb (patch)
treee894c1a4449f891ca17dc521a7d8a941f4ee541f /dev/css-to-json-util.js
parent3e938f1a1fdb5064f8d11060685699d3217d16a2 (diff)
Add generalized css-to-json-util dev module (#1836)
Diffstat (limited to 'dev/css-to-json-util.js')
-rw-r--r--dev/css-to-json-util.js169
1 files changed, 169 insertions, 0 deletions
diff --git a/dev/css-to-json-util.js b/dev/css-to-json-util.js
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+++ b/dev/css-to-json-util.js
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+/*
+ * 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/>.
+ */
+
+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${indent1}}`;
+ ++index1;
+ }
+ if (index1 > 0) { result += '\n'; }
+ result += ']';
+ return result;
+}
+
+function generateRules(cssFile, cssFileOverrides) {
+ const content1 = fs.readFileSync(cssFile, {encoding: 'utf8'});
+ const content2 = fs.readFileSync(cssFileOverrides, {encoding: 'utf8'});
+ const stylesheet1 = css.parse(content1, {}).stylesheet;
+ const stylesheet2 = css.parse(content2, {}).stylesheet;
+
+ const removePropertyPattern = /^remove-property\s+([a-zA-Z0-9-]+)$/;
+ const removeRulePattern = /^remove-rule$/;
+
+ 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) {
+ const property = m[1];
+ const removeCount = removeProperty(rules[index].styles, property, removedProperties);
+ if (removeCount === 0) { throw new Error(`Property removal is unnecessary; ${property} does not exist`); }
+ } else if ((m = removeRulePattern.exec(comment)) !== null) {
+ 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
+};