Adding RegEx input checks and removing license (#22)

* Initial Push

Inititial project state

* Static demo version

* static demo site - added variables

a

* first_implementation

* Updated UI, Improved Style to be more "Reactly", added Functionality

* add parsing functions

* change folder

* Import/Export Prototype

* Adding "reactjs-popup" to package,json

* Adding GLPK source

* Rough implementation of solver + example

* Show solution in output

* example 2 + popup lib

* removing import button

This feature won't be needed in this state of the project and might come back later. Right now it serves no functional purpose.

* Removing "Popout" button

This feature won't be needed in this state of the project and might come back later. Right now it serves no functional purpose.

* Updating Logs

Now the site displays all logs created with customLog(STRING). Logs can be cleared with customLogClear();

* Adding walltime

Can be called using:

Start:
function walltimeStart() {
returns Date.now();

Stop:
function walltimeStopAndPrint(startpoint: number) {
Add startpoint as argument.
It prints the elapsed time using customLog()

* Adding duals ouput

* Adding glpk.js package

required dependency

* adding LP format export and fixing a few errors

* fixing further errors

* adding automatic build

* Moving files to correct folders

* Update nextjs.yml

* Updating README and .gitignore

README:
- added installation instructions
- added troubleshooting

gitignore:
- skipping Writerside and .idea folders

* Update LICENCE.txt

We are required to use the same license. See https://github.com/hgourvest/node-glpk/blob/master/LICENSE

* Updating icon

* Adding RegEx input checks and updating text box explanations

* Update README.md

Updating license info

Signed-off-by: SinusFox <61253950+SinusFox@users.noreply.github.com>

* Deleting license to recreate proper license

* Update layout.tsx

fixing typo

Signed-off-by: SinusFox <61253950+SinusFox@users.noreply.github.com>

* Fixing word issue

English has some false friends... like the German "Enter" is actually return in English.

---------

Signed-off-by: SinusFox <61253950+SinusFox@users.noreply.github.com>
Co-authored-by: moebiusl <lucas.moebius@icloud.com>
Co-authored-by: Marcel Pöppe <marcel.poeppe@gmail.com>

src/app/scripts.ts

@@ -46,6 +46,52 @@ function walltimeStart() {
   return Date.now();
 }
 
+function isInputValidRegex(obj: string | undefined, subj: string | undefined, bounds: string | undefined, vars: string | undefined): boolean {
+  customLog("Staring input checks...");
+  
+  // standard case: input is undefined - invalid
+  if (obj === undefined || obj === null || subj === undefined || subj === null || bounds === undefined || bounds === null || vars === undefined || vars === null) { 
+    customLog("Error: Function isInputValidRegex received undefined or null input.");
+    return false;
+  }
+
+  // RegEx check for objective
+  let regex = /^[ (\n)]*[\+-]? *((\d+(.\d+)? )?[a-zA-Z][a-zA-Z0-9]*)( *[\+-] *((\d+(.\d+)? )?[a-zA-Z][a-zA-Z0-9]*))*[ (\n)]*$/g;
+  let isValid = regex.test(obj);
+  if (!isValid) {
+    customLog("Error: Invalid or missing character in object box.");
+      return false;
+  }
+
+  // RegEx check for subject
+  regex = /^([ (\n)]*[\+-]* *(\d+(.\d+)? )?[a-zA-Z][a-zA-Z0-9]*( *[\+-] *(\d+(.\d+)? )?[a-zA-Z][a-zA-Z0-9]*)* *((<=?)|(>=?)|=) *[\+-]? *\d+(.\d+)?[ (\n)]*)+$/g;
+  isValid = regex.test(subj);
+  if (!isValid) {
+    customLog("Error: Invalid or missing character in subject box.");
+      return false;
+  }
+
+// RegEx check for subject
+regex = /[ (\n)]*(([a-zA-Z][a-zA-Z0-9]* *((<=?)|(>=?)|=) *\d(.\d+)?)|((\d(.\d+)?) *<=? *[a-zA-Z][a-zA-Z0-9]* *<= *(\d(.\d+)?)))[ (\n)]*/g;
+isValid = regex.test(bounds);
+if (!isValid) {
+  customLog("Error: Invalid or missing character in bounds box.");
+    return false;
+}
+
+  // RegEx check for variables
+  regex = /^ *([a-zA-Z][a-zA-Z0-9]*(\n)* *)+$/g;
+  isValid = regex.test(vars);
+  if (!isValid) {
+    customLog("Error: Invalid or missing  character in variables box.");
+    return false;
+  }
+
+  customLog("All input checks successful.");
+  customLog("");
+  return true;
+}
+
 function isInputFilled(obj: string | undefined, subj: string | undefined, bounds: string | undefined, vars: string | undefined) {
   if (obj == "" || obj == null || obj == undefined) {
     customLog("Error: Empty input field.");
@@ -148,6 +194,9 @@ export function calculate_click() {
   // catch error: empty input field(s)
   if (!isInputFilled(objective, subject, bounds, variables)) return;
 
+  // catch error: variables field has invalid characters
+  if (!isInputValidRegex(objective, subject, bounds, variables)) return;
+
   let wholeText: string = "Maximize\n obj: " + objective
                         + "\nSubject To \n" + subject 
                         + "\nBounds \n" + bounds