scopic-software/test-simple-calculator
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[TSC-9] Add numeric input validator module

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- Create validator.js with validateNumericInput() function
- Validates numeric strings; allows digits, leading minus, single decimal point
- Rejects invalid characters, multiple decimals, misplaced minus signs
- Returns { isValid, value, sanitized } object
- Link validator.js in index.html <head>
- Update CLAUDE.md project structure to include validator.js
This commit is contained in:
viet-anh.n 2026-07-08 07:58:12 +00:00
parent b6dd764c87
commit 89159fb927
3 changed files with 49 additions and 0 deletions
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1
CLAUDE.md
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@ -8,6 +8,7 @@ Greenfield project. Implementation is driven by the Vexa AI-SDLC pipeline (Jira
/
├── index.html # Calculator UI (semantic HTML5)
├── styles.css # Responsive CSS layout and styling
├── validator.js # Numeric input validator (validateNumericInput)
├── README.md # Project overview
└── CLAUDE.md # This file
```

1
index.html
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@ -5,6 +5,7 @@
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Simple Calculator</title>
<link rel="stylesheet" href="styles.css">
<script src="validator.js"></script>
</head>
<body>
<main>

47
validator.js Normal file
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@ -0,0 +1,47 @@
/**
* Validates a numeric input string.
*
* Allowed characters: digits 0-9, a single decimal point, a leading minus sign.
* Returns an object with:
* isValid {boolean} - true when the string represents a well-formed number
* value {number|null} - parsed numeric value, or null when invalid
* sanitized {string} - trimmed input string
*/
function validateNumericInput(input) {
var str = String(input).trim();
var result = { isValid: false, value: null, sanitized: str };
if (str === '') {
return result;
}
// Reject characters other than digits, decimal point, and minus sign
if (/[^0-9.\-]/.test(str)) {
return result;
}
// Minus sign is only valid as the very first character
var minusCount = (str.match(/-/g) || []).length;
if (minusCount > 1 || (minusCount === 1 && str.charAt(0) !== '-')) {
return result;
}
// Only one decimal point is allowed
if ((str.match(/\./g) || []).length > 1) {
return result;
}
// A bare '-' or '.' is not a valid number
if (str === '-' || str === '.') {
return result;
}
var parsed = parseFloat(str);
if (isNaN(parsed)) {
return result;
}
result.isValid = true;
result.value = parsed;
return result;
}