From a865377ee01511bff65cda3e8f6fc67606a6b370 Mon Sep 17 00:00:00 2001
From: Daniel Chang <mwdchang@gmail.com>
Date: Thu, 17 Oct 2024 09:18:31 -0400
Subject: [PATCH] parser encode decode for reserved symbols

---
 .../hmi-client/src/python/PyodideWorker.ts    | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/packages/client/hmi-client/src/python/PyodideWorker.ts b/packages/client/hmi-client/src/python/PyodideWorker.ts
index fc14d4d2f5..e2c383a38b 100644
--- a/packages/client/hmi-client/src/python/PyodideWorker.ts
+++ b/packages/client/hmi-client/src/python/PyodideWorker.ts
@@ -52,6 +52,21 @@ pyodide.runPython(`
 
 postMessage(true);
 
+const encodeParseExpr = (v: string) => {
+	let expr = v.toString().replaceAll('lambda', 'XXlambdaXX');
+	expr = expr.replaceAll('Ci', 'XXCiXX');
+	expr = expr.replaceAll('S', 'XXSXX');
+	return expr;
+};
+
+// Reverse special cases
+const revertParseExpr = (v: string) => {
+	let resultStr = v.replaceAll('XXlambdaXX', 'lambda');
+	resultStr = resultStr.replaceAll('XXSXX', 'S');
+	resultStr = resultStr.replaceAll('XXCiXX', 'Ci');
+	return resultStr;
+};
+
 const evaluateExpression = (expressionStr: string, symbolsTable: Object) => {
 	const subs: any[] = [];
 	Object.keys(symbolsTable).forEach((key) => {
@@ -82,6 +97,9 @@ const parseExpression = (expr: string) => {
 		return output;
 	}
 
+	// Special cases
+	expr = encodeParseExpr(expr);
+
 	// function to convert expression to presentation mathml
 	let result = pyodide.runPython(`
 		eq = sympy.S("${expr}", locals=_clash)
@@ -115,6 +133,10 @@ const parseExpression = (expr: string) => {
 	`);
 	output.freeSymbols = result.toJs();
 
+	output.latex = revertParseExpr(output.latex);
+	output.mathml = revertParseExpr(output.mathml);
+	output.pmathml = revertParseExpr(output.pmathml);
+
 	return output;
 };