Update server.js #161
Update server.js #161
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Reviewer's Guide by SourceryThis PR updates the calculator server's expression handling by simplifying and modernizing the mathematical operations supported. The changes focus on streamlining the regex patterns and calculation logic, removing some less commonly used operations while adding support for π (pi) calculations. No diagrams generated as the changes look simple and do not need a visual representation. File-Level Changes
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Caution Review failedThe pull request is closed. WalkthroughThe changes in this pull request primarily modify the Changes
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Hey @skanda890 - I've reviewed your changes - here's some feedback:
Overall Comments:
- This PR introduces several breaking changes by removing trigonometric, logarithmic, permutation, and combination functions, and changing the square root syntax. Please provide justification for these removals and include a changelog/migration guide for existing clients.
- The new large number handling for power operations (base^exponent) is less accurate than the previous logarithm-based calculation. Consider keeping the original implementation for mathematical precision.
Here's what I looked at during the review
- 🟡 General issues: 2 issues found
- 🟢 Security: all looks good
- 🟢 Testing: all looks good
- 🟢 Complexity: all looks good
- 🟢 Documentation: all looks good
Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.
math-calculator/server.js
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| if (exponent > 100000) { | ||
| solution = `1 followed by ${exponent} zeros`; | ||
| explanation = `${base}^${exponent} is extremely large and has ${exponent + 1} digits.`; |
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issue (bug_risk): The calculation of digits for large powers is incorrect
The number of digits should be calculated as floor(exponent * log10(base)) + 1. The current implementation assumes base 10, which is incorrect for other bases.
math-calculator/server.js
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| const combinationRegex = /(\d+)C(\d+)/; | ||
| const logRegex = /log\((\d+)\)/; | ||
| const trigRegex = /(sin|cos|tan)\((\d+)\)/; | ||
| const sqrtRegex = /√(\d+)(\^(-?\d+))?/; // Match "√<number>" and optional "^exponent" |
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suggestion: Square root syntax should support both '√' and 'sqrt' for better accessibility
Consider modifying the regex to accept both notations: /(√|sqrt)(\d+)(^(-?\d+))?/
| const sqrtRegex = /√(\d+)(\^(-?\d+))?/; // Match "√<number>" and optional "^exponent" | |
| const sqrtRegex = /(√|sqrt)(\d+)(\^(-?\d+))?/; |
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Actionable comments posted: 3
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📒 Files selected for processing (1)
math-calculator/server.js(3 hunks)
🧰 Additional context used
🪛 GitHub Check: CodeQL
math-calculator/server.js
[failure] 55-55: Polynomial regular expression used on uncontrolled data
This regular expression that depends on a user-provided value may run slow on strings with many repetitions of '9'.
[failure] 56-56: Polynomial regular expression used on uncontrolled data
This regular expression that depends on a user-provided value may run slow on strings with many repetitions of '9'.
[failure] 65-65: Polynomial regular expression used on uncontrolled data
This regular expression that depends on a user-provided value may run slow on strings with many repetitions of '9'.
🔇 Additional comments (1)
math-calculator/server.js (1)
29-33:
Fix the invalid characters in assignmentRegex pattern
The assignmentRegex contains special characters '', which may be unintended and could cause regex matching errors or unexpected behavior. Replace '' with the correct characters or remove them if unnecessary.
Apply this diff to fix the regex pattern:
- const assignmentRegex = /([^=]+)=([^=]+)\^([^=]+)/; // Match for assignment-like expressions (x=10)^999999
+ const assignmentRegex = /([^=]+)=([^=]+)\^([^=]+)/; // Match for assignment-like expressions (x=10)^999999Likely invalid or redundant comment.
math-calculator/server.js
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| const sqrtRegex = /√(\d+)(\^(-?\d+))?/; // Match "√<number>" and optional "^exponent" | ||
| const factorialRegex = /(\d+)!/; // Match "number!" | ||
| const largePowerRegex = /(\d+)\^(\d+)/; // Match "base^exponent" |
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Prevent potential ReDoS vulnerabilities in regular expressions
The current regular expressions may be susceptible to Regular Expression Denial of Service (ReDoS) attacks if supplied with malicious input. Consider limiting the length of the input or using safer regex patterns to prevent performance issues.
Apply this diff to limit the input length:
+ const MAX_INPUT_LENGTH = 1000; // Define a maximum acceptable input length
function handleCalculation(expression) {
+ if (expression.length > MAX_INPUT_LENGTH) {
+ throw new Error('Input too long');
+ }Committable suggestion skipped: line range outside the PR's diff.
math-calculator/server.js
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| const number = parseFloat(match[1]); // Extract the number after "√" | ||
| const exponent = match[3] ? parseFloat(match[3]) : 1; // Default to 1 if no exponent is provided | ||
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| // Calculate the square root and apply the exponent | ||
| const sqrtValue = Math.sqrt(number); | ||
| solution = Math.pow(sqrtValue, exponent); // Apply exponent to the square root | ||
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| explanation = `The square root of ${number} is calculated as √${number}, which is ${sqrtValue}. Then raising this value to the power of ${exponent} gives ${solution}.`; | ||
| } else if (squareRegex.test(expression)) { | ||
| const number = parseFloat(expression.match(squareRegex)[1]); | ||
| solution = Math.pow(number, 2); | ||
| explanation = `The square of ${number} is ${solution}.`; | ||
| } else if (powerRegex.test(expression)) { | ||
| const match = expression.match(powerRegex); | ||
| const base = new Decimal(match[1]); | ||
| const exponent = new Decimal(match[2]); | ||
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| if (exponent.gt(1000)) { | ||
| // Handle extremely large exponents | ||
| const digits = Math.floor(Math.log10(base.toNumber()) * exponent.toNumber()) + 1; | ||
| solution = `1 followed by ${digits - 1} zeros`; | ||
| explanation = `${base}^${exponent} is extremely large and has ${digits} digits.`; | ||
| } else { | ||
| solution = base.pow(exponent).toString(); | ||
| explanation = `${base}^${exponent} = ${solution}.`; | ||
| } | ||
| const sqrtValue = Math.sqrt(number); // Calculate square root | ||
| solution = Math.pow(sqrtValue, exponent); // Apply exponent | ||
| explanation = `The square root of ${number} is √${number} = ${sqrtValue}. Then raising it to the power of ${exponent} gives ${solution}.`; |
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Handle negative numbers in square root calculations
The current implementation does not handle negative numbers. Calculating the square root of a negative number results in NaN, which may not be the intended behavior. Consider adding input validation to handle negative inputs appropriately.
Apply this diff to add input validation:
const number = parseFloat(match[1]); // Extract the number after "√"
+ if (number < 0) {
+ throw new Error(`Cannot calculate the square root of a negative number: ${number}`);
+ }
const exponent = match[3] ? parseFloat(match[3]) : 1; // Default to 1 if no exponent is provided📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| const number = parseFloat(match[1]); // Extract the number after "√" | |
| const exponent = match[3] ? parseFloat(match[3]) : 1; // Default to 1 if no exponent is provided | |
| // Calculate the square root and apply the exponent | |
| const sqrtValue = Math.sqrt(number); | |
| solution = Math.pow(sqrtValue, exponent); // Apply exponent to the square root | |
| explanation = `The square root of ${number} is calculated as √${number}, which is ${sqrtValue}. Then raising this value to the power of ${exponent} gives ${solution}.`; | |
| } else if (squareRegex.test(expression)) { | |
| const number = parseFloat(expression.match(squareRegex)[1]); | |
| solution = Math.pow(number, 2); | |
| explanation = `The square of ${number} is ${solution}.`; | |
| } else if (powerRegex.test(expression)) { | |
| const match = expression.match(powerRegex); | |
| const base = new Decimal(match[1]); | |
| const exponent = new Decimal(match[2]); | |
| if (exponent.gt(1000)) { | |
| // Handle extremely large exponents | |
| const digits = Math.floor(Math.log10(base.toNumber()) * exponent.toNumber()) + 1; | |
| solution = `1 followed by ${digits - 1} zeros`; | |
| explanation = `${base}^${exponent} is extremely large and has ${digits} digits.`; | |
| } else { | |
| solution = base.pow(exponent).toString(); | |
| explanation = `${base}^${exponent} = ${solution}.`; | |
| } | |
| const sqrtValue = Math.sqrt(number); // Calculate square root | |
| solution = Math.pow(sqrtValue, exponent); // Apply exponent | |
| explanation = `The square root of ${number} is √${number} = ${sqrtValue}. Then raising it to the power of ${exponent} gives ${solution}.`; | |
| const number = parseFloat(match[1]); // Extract the number after "√" | |
| if (number < 0) { | |
| throw new Error(`Cannot calculate the square root of a negative number: ${number}`); | |
| } | |
| const exponent = match[3] ? parseFloat(match[3]) : 1; // Default to 1 if no exponent is provided | |
| const sqrtValue = Math.sqrt(number); // Calculate square root | |
| solution = Math.pow(sqrtValue, exponent); // Apply exponent | |
| explanation = `The square root of ${number} is √${number} = ${sqrtValue}. Then raising it to the power of ${exponent} gives ${solution}.`; |
math-calculator/server.js
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| } else if (largePowerRegex.test(expression)) { | ||
| const match = expression.match(largePowerRegex); | ||
| const base = parseInt(match[1], 10); | ||
| const exponent = parseInt(match[2], 10); | ||
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| if (exponent > 100000) { | ||
| solution = `1 followed by ${exponent} zeros`; | ||
| explanation = `${base}^${exponent} is extremely large and has ${exponent + 1} digits.`; | ||
| } else { | ||
| solution = Math.pow(base, exponent); | ||
| explanation = `${base}^${exponent} = ${solution}.`; |
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Avoid potential overflow and performance issues with large exponents
Calculating Math.pow(base, exponent) with very large exponents may cause performance issues or overflow errors. Consider adding a check to handle large exponents more efficiently or limit the allowable exponent value.
Apply this diff to adjust the exponent handling:
const base = parseInt(match[1], 10);
const exponent = parseInt(match[2], 10);
+ if (exponent > MAX_EXPONENT_VALUE) {
+ throw new Error(`Exponent ${exponent} is too large to compute safely.`);
+ }
if (exponent > 100000) {
solution = `1 followed by ${exponent} zeros`;
explanation = `${base}^${exponent} is extremely large and has ${exponent + 1} digits.`;
} else {
solution = Math.pow(base, exponent);
explanation = `${base}^${exponent} = ${solution}.`;
}Define MAX_EXPONENT_VALUE at the beginning of your file:
+ const MAX_EXPONENT_VALUE = 1000000; // Set an appropriate maximum exponent valueCommittable suggestion skipped: line range outside the PR's diff.
🧰 Tools
🪛 GitHub Check: CodeQL
[failure] 65-65: Polynomial regular expression used on uncontrolled data
This regular expression that depends on a user-provided value may run slow on strings with many repetitions of '9'.
| const digits = Math.floor(Math.log10(base.toNumber()) * exponent.toNumber()) + 1; | ||
| solution = `1 followed by ${digits - 1} zeros`; | ||
| explanation = `${base}^${exponent} is extremely large and has ${digits} digits.`; | ||
| } else { | ||
| solution = base.pow(exponent).toString(); | ||
| explanation = `${base}^${exponent} = ${solution}.`; | ||
| } | ||
| } else if (assignmentRegex.test(expression)) { |
Check failure
Code scanning / CodeQL
Polynomial regular expression used on uncontrolled data High
| const digits = Math.floor(Math.log10(base.toNumber()) * exponent.toNumber()) + 1; | ||
| solution = `1 followed by ${digits - 1} zeros`; | ||
| explanation = `${base}^${exponent} is extremely large and has ${digits} digits.`; | ||
| } else { | ||
| solution = base.pow(exponent).toString(); | ||
| explanation = `${base}^${exponent} = ${solution}.`; | ||
| } | ||
| } else if (assignmentRegex.test(expression)) { | ||
| const match = expression.match(assignmentRegex); |
Check failure
Code scanning / CodeQL
Polynomial regular expression used on uncontrolled data High
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Summary by Sourcery
Enhancements:
Summary by CodeRabbit
New Features
Bug Fixes
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