1 files changed, 33 insertions, 0 deletions
diff --git a/app/assets/javascripts/ide/lib/editorconfig/rules_mapper.js b/app/assets/javascripts/ide/lib/editorconfig/rules_mapper.js
new file mode 100644
index 00000000000..f9d5579511a
--- /dev/null
+++ b/app/assets/javascripts/ide/lib/editorconfig/rules_mapper.js
@@ -0,0 +1,33 @@
+import { isBoolean, isNumber } from 'lodash';
+
+const map = (key, validValues) => value =>
+  value in validValues ? { [key]: validValues[value] } : {};
+
+const bool = key => value => (isBoolean(value) ? { [key]: value } : {});
+
+const int = (key, isValid) => value =>
+  isNumber(value) && isValid(value) ? { [key]: Math.trunc(value) } : {};
+
+const rulesMapper = {
+  indent_style: map('insertSpaces', { tab: false, space: true }),
+  indent_size: int('tabSize', n => n > 0),
+  tab_width: int('tabSize', n => n > 0),
+  trim_trailing_whitespace: bool('trimTrailingWhitespace'),
+  end_of_line: map('endOfLine', { crlf: 1, lf: 0 }),
+  insert_final_newline: bool('insertFinalNewline'),
+};
+
+const parseValue = x => {
+  let value = typeof x === 'string' ? x.toLowerCase() : x;
+  if (/^[0-9.-]+$/.test(value)) value = Number(value);
+  if (value === 'true') value = true;
+  if (value === 'false') value = false;
+
+  return value;
+};
+
+export default function mapRulesToMonaco(rules) {
+  return Object.entries(rules).reduce((obj, [key, value]) => {
+    return Object.assign(obj, rulesMapper[key]?.(parseValue(value)) || {});
+  }, {});
+}