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<h1><a href="../../../index.html">All files</a> / <a href="index.html">src/tools/bughunter</a> heuristics.ts</h1>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* Bughunter Heuristics Engine
*
* Pattern-based bug detection for GDScript with severity scoring.
* Detects common programming errors and GDScript-specific antipatterns.
*/
import Parser from 'tree-sitter';
/**
* Bug match result from pattern detection
*/
export interface BugMatch {
pattern: string;
name: string;
severity: 'low' | 'medium' | 'high' | 'critical';
line: number;
column: number;
message: string;
file?: string;
suggestion?: string;
}
/**
* Bug pattern definition
*/
export interface BugPattern {
id: string;
name: string;
severity: 'low' | 'medium' | 'high' | 'critical';
description: string;
detect: (node: Parser.SyntaxNode, source: string) => Omit<BugMatch, 'pattern' | 'name' | 'severity'> | null;
}
/**
* Check if a node has a null guard (is, as, or if check) in parent context
*/
function <span class="fstat-no" title="function not covered" >hasNullGuard(</span>node: Parser.SyntaxNode | null, maxDepth: number = <span class="branch-0 cbranch-no" title="branch not covered" >3)</span>: boolean {
let current = <span class="cstat-no" title="statement not covered" >node;</span>
let depth = <span class="cstat-no" title="statement not covered" >0;</span>
<span class="cstat-no" title="statement not covered" > while (current && depth < maxDepth) {</span>
const parentType = <span class="cstat-no" title="statement not covered" >current.type;</span>
// Check for null guard patterns
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (parentType === 'if_statement' || </span>
parentType === 'is_expression' ||
parentType === 'assert_statement') {
<span class="cstat-no" title="statement not covered" > return true;</span>
}
<span class="cstat-no" title="statement not covered" > current = current.parent;</span>
<span class="cstat-no" title="statement not covered" > depth++;</span>
}
<span class="cstat-no" title="statement not covered" > return false;</span>
}
/**
* Get node text from source
*/
function <span class="fstat-no" title="function not covered" >getNodeText(</span>node: Parser.SyntaxNode, source: string): string {
<span class="cstat-no" title="statement not covered" > return source.slice(node.startIndex, node.endIndex);</span>
}
/**
* Check if identifier starts with uppercase (likely a class/constant)
*/
function <span class="fstat-no" title="function not covered" >isUpperCase(</span>text: string): boolean {
<span class="cstat-no" title="statement not covered" > return text.length > 0 && text[0] === text[0].toUpperCase();</span>
}
/**
* Bug pattern definitions - 10 common patterns
*/
export const BUG_PATTERNS: BugPattern[] = <span class="cstat-no" title="statement not covered" >[</span>
// General patterns (5)
{
id: 'missing_null_check',
name: 'Missing Null Check',
severity: 'medium',
description: 'Variable access without null validation',
detect: <span class="fstat-no" title="function not covered" >(n</span>ode, source) => {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (node.type === 'call' && node.parent) {</span>
const callee = <span class="cstat-no" title="statement not covered" >node.childForFieldName('function');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (callee && callee.type === 'attribute') {</span>
const obj = <span class="cstat-no" title="statement not covered" >callee.childForFieldName('object');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (obj && obj.type === 'identifier' && !hasNullGuard(node)) {</span>
const varName = <span class="cstat-no" title="statement not covered" >getNodeText(obj, source);</span>
// Skip if it's a class/constant (uppercase)
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (!isUpperCase(varName)) {</span>
<span class="cstat-no" title="statement not covered" > return {</span>
line: node.startPosition.row + 1,
column: node.startPosition.column + 1,
message: `Potential null reference on '${varName}' - consider adding null check`,
suggestion: `if ${varName}: ${getNodeText(node, source)}`,
};
}
}
}
}
<span class="cstat-no" title="statement not covered" > return null;</span>
},
},
{
id: 'missing_error_handling',
name: 'Missing Error Handling',
severity: 'high',
description: 'Function call that can fail without error handling',
detect: <span class="fstat-no" title="function not covered" >(n</span>ode, source) => {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (node.type === 'call') {</span>
const funcName = <span class="cstat-no" title="statement not covered" >node.childForFieldName('function');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (funcName) {</span>
const name = <span class="cstat-no" title="statement not covered" >getNodeText(funcName, source);</span>
// Common error-prone functions
const riskyFunctions = <span class="cstat-no" title="statement not covered" >['load', 'open', 'connect', 'instantiate', 'get_node'];</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (riskyFunctions.some(<span class="fstat-no" title="function not covered" >f </span>=> <span class="cstat-no" title="statement not covered" >name.includes(f))</span>) {</span>
// Check if result is checked
const parent = <span class="cstat-no" title="statement not covered" >node.parent;</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (parent && parent.type !== 'if_statement' && parent.type !== 'assignment') {</span>
<span class="cstat-no" title="statement not covered" > return {</span>
line: node.startPosition.row + 1,
column: node.startPosition.column + 1,
message: `Function '${name}' can fail - consider checking return value`,
suggestion: 'var result = ...; if result: ...',
};
}
}
}
}
<span class="cstat-no" title="statement not covered" > return null;</span>
},
},
{
id: 'type_mismatch_likely',
name: 'Likely Type Mismatch',
severity: 'medium',
description: 'Potential type incompatibility',
detect: <span class="fstat-no" title="function not covered" >(n</span>ode, source) => {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (node.type === 'assignment') {</span>
const left = <span class="cstat-no" title="statement not covered" >node.childForFieldName('left');</span>
const right = <span class="cstat-no" title="statement not covered" >node.childForFieldName('right');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (left && right) {</span>
const leftText = <span class="cstat-no" title="statement not covered" >getNodeText(left, source);</span>
const rightText = <span class="cstat-no" title="statement not covered" >getNodeText(right, source);</span>
// Detect string assignment to number variable names
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (leftText.includes('count') || leftText.includes('index') || leftText.includes('num')) {</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (rightText.includes('"') || rightText.includes("'")) {</span>
<span class="cstat-no" title="statement not covered" > return {</span>
line: node.startPosition.row + 1,
column: node.startPosition.column + 1,
message: `Assigning string to numeric variable '${leftText}'`,
suggestion: 'Add type hint or use int()/float()',
};
}
}
}
}
<span class="cstat-no" title="statement not covered" > return null;</span>
},
},
{
id: 'division_by_zero_risk',
name: 'Division by Zero Risk',
severity: 'high',
description: 'Division operation without denominator validation',
detect: <span class="fstat-no" title="function not covered" >(n</span>ode, source) => {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (node.type === 'binary_operator') {</span>
const operator = <span class="cstat-no" title="statement not covered" >node.childForFieldName('operator');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (operator && getNodeText(operator, source) === '/') {</span>
const right = <span class="cstat-no" title="statement not covered" >node.childForFieldName('right');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (right && right.type === 'identifier') {</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (!hasNullGuard(node)) {</span>
<span class="cstat-no" title="statement not covered" > return {</span>
line: node.startPosition.row + 1,
column: node.startPosition.column + 1,
message: 'Division by zero risk - validate denominator',
suggestion: 'if denominator != 0: result = numerator / denominator',
};
}
}
}
}
<span class="cstat-no" title="statement not covered" > return null;</span>
},
},
{
id: 'unused_return_value',
name: 'Unused Return Value',
severity: 'low',
description: 'Function with return value called without using result',
detect: <span class="fstat-no" title="function not covered" >(n</span>ode, source) => {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (node.type === 'expression_statement') {</span>
const child = <span class="cstat-no" title="statement not covered" >node.firstChild;</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (child && child.type === 'call') {</span>
const funcName = <span class="cstat-no" title="statement not covered" >child.childForFieldName('function');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (funcName) {</span>
const name = <span class="cstat-no" title="statement not covered" >getNodeText(funcName, source);</span>
// Functions that typically return important values
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (name.startsWith('get_') || name.includes('find') || name.includes('search')) {</span>
<span class="cstat-no" title="statement not covered" > return {</span>
line: node.startPosition.row + 1,
column: node.startPosition.column + 1,
message: `Return value of '${name}' is unused`,
suggestion: 'var result = ' + getNodeText(child, source),
};
}
}
}
}
<span class="cstat-no" title="statement not covered" > return null;</span>
},
},
// GDScript-specific patterns (5)
{
id: 'signal_leak',
name: 'Signal Not Disconnected',
severity: 'high',
description: 'Signal connection without corresponding disconnection',
detect: <span class="fstat-no" title="function not covered" >(n</span>ode, source) => {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (node.type === 'call') {</span>
const funcName = <span class="cstat-no" title="statement not covered" >node.childForFieldName('function');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (funcName && getNodeText(funcName, source).endsWith('.connect')) {</span>
// Check if there's a matching disconnect in the file
// This is a simplified heuristic - full analysis would track signal names
const text = <span class="cstat-no" title="statement not covered" >getNodeText(node, source);</span>
const signalName = <span class="cstat-no" title="statement not covered" >text.match(/\.connect\(["'](\w+)["']/)?.[1];</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (signalName) {</span>
<span class="cstat-no" title="statement not covered" > return {</span>
line: node.startPosition.row + 1,
column: node.startPosition.column + 1,
message: `Signal '${signalName}' connected but may not be disconnected`,
suggestion: 'Add disconnect() in _exit_tree() or cleanup method',
};
}
}
}
<span class="cstat-no" title="statement not covered" > return null;</span>
},
},
{
id: 'node_not_freed',
name: 'Node Not Freed',
severity: 'critical',
description: 'Dynamically created node without queue_free() or free()',
detect: <span class="fstat-no" title="function not covered" >(n</span>ode, source) => {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (node.type === 'call') {</span>
const funcName = <span class="cstat-no" title="statement not covered" >node.childForFieldName('function');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (funcName) {</span>
const name = <span class="cstat-no" title="statement not covered" >getNodeText(funcName, source);</span>
// Check for node creation
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (name === 'new' || name.includes('.new') || name.includes('.instance')) {</span>
// This is a basic check - proper analysis would track variable lifecycle
<span class="cstat-no" title="statement not covered" > return {</span>
line: node.startPosition.row + 1,
column: node.startPosition.column + 1,
message: 'Dynamically created node may not be freed',
suggestion: 'Call queue_free() when done or use add_child() for auto-cleanup',
};
}
}
}
<span class="cstat-no" title="statement not covered" > return null;</span>
},
},
{
id: 'missing_ready_check',
name: 'Missing Ready Check',
severity: 'medium',
description: 'Node access in _init() instead of _ready()',
detect: <span class="fstat-no" title="function not covered" >(n</span>ode, source) => {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (node.type === 'function_definition') {</span>
const nameNode = <span class="cstat-no" title="statement not covered" >node.childForFieldName('name');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (nameNode && getNodeText(nameNode, source) === '_init') {</span>
// Check for get_node or $ calls in _init
const body = <span class="cstat-no" title="statement not covered" >node.childForFieldName('body');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (body) {</span>
const hasNodeAccess = <span class="cstat-no" title="statement not covered" >body.descendantsOfType('call').some(<span class="fstat-no" title="function not covered" >call </span>=> {</span>
const func = <span class="cstat-no" title="statement not covered" >call.childForFieldName('function');</span>
<span class="cstat-no" title="statement not covered" > return func && (getNodeText(func, source).includes('get_node') || </span>
getNodeText(func, source).includes('$'));
});
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (hasNodeAccess) {</span>
<span class="cstat-no" title="statement not covered" > return {</span>
line: node.startPosition.row + 1,
column: node.startPosition.column + 1,
message: 'Node access in _init() - use _ready() instead',
suggestion: 'Move node access to _ready() function',
};
}
}
}
}
<span class="cstat-no" title="statement not covered" > return null;</span>
},
},
{
id: 'export_without_type',
name: 'Export Without Type Hint',
severity: 'low',
description: 'Exported variable lacks type hint for editor',
detect: <span class="fstat-no" title="function not covered" >(n</span>ode, source) => {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (node.type === 'decorated_definition') {</span>
const decorator = <span class="cstat-no" title="statement not covered" >node.childForFieldName('decorator');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (decorator && getNodeText(decorator, source).includes('@export')) {</span>
const definition = <span class="cstat-no" title="statement not covered" >node.childForFieldName('definition');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (definition && definition.type === 'variable_declaration') {</span>
const typeNode = <span class="cstat-no" title="statement not covered" >definition.childForFieldName('type');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (!typeNode) {</span>
const varName = <span class="cstat-no" title="statement not covered" >definition.childForFieldName('name');</span>
<span class="cstat-no" title="statement not covered" > return {</span>
line: node.startPosition.row + 1,
column: node.startPosition.column + 1,
message: `Exported variable '${varName ? getNodeText(varName, source) : 'unknown'}' lacks type hint`,
suggestion: '@export var name: Type = value',
};
}
}
}
}
<span class="cstat-no" title="statement not covered" > return null;</span>
},
},
{
id: 'onready_with_null_path',
name: 'Onready With Potentially Invalid Path',
severity: 'medium',
description: '@onready variable with hardcoded node path',
detect: <span class="fstat-no" title="function not covered" >(n</span>ode, source) => {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (node.type === 'decorated_definition') {</span>
const decorator = <span class="cstat-no" title="statement not covered" >node.childForFieldName('decorator');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (decorator && getNodeText(decorator, source).includes('@onready')) {</span>
const definition = <span class="cstat-no" title="statement not covered" >node.childForFieldName('definition');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (definition) {</span>
const initializer = <span class="cstat-no" title="statement not covered" >definition.childForFieldName('value');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (initializer) {</span>
const text = <span class="cstat-no" title="statement not covered" >getNodeText(initializer, source);</span>
// Check for hardcoded paths like get_node("HardcodedPath")
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (text.includes('get_node') && /["'][^$%]/.test(text)) {</span>
<span class="cstat-no" title="statement not covered" > return {</span>
line: node.startPosition.row + 1,
column: node.startPosition.column + 1,
message: '@onready with hardcoded path - may break if scene structure changes',
suggestion: 'Use $NodeName or add null check in _ready()',
};
}
}
}
}
}
<span class="cstat-no" title="statement not covered" > return null;</span>
},
},
];
/**
* Apply all heuristic patterns to an AST and collect bug matches
*
* @param tree - Tree-sitter parse tree
* @param source - Original source code
* @returns Array of bug matches
*/
export function <span class="fstat-no" title="function not covered" >applyHeuristics(</span>tree: Parser.Tree, source: string): BugMatch[] {
const matches: BugMatch[] = <span class="cstat-no" title="statement not covered" >[];</span>
// Traverse all nodes
const cursor = <span class="cstat-no" title="statement not covered" >tree.walk();</span>
function <span class="fstat-no" title="function not covered" >visit(</span>) {
const node = <span class="cstat-no" title="statement not covered" >cursor.currentNode;</span>
// Apply each pattern to this node
<span class="cstat-no" title="statement not covered" > for (const pattern of BUG_PATTERNS) {</span>
<span class="cstat-no" title="statement not covered" > try {</span>
const match = <span class="cstat-no" title="statement not covered" >pattern.detect(node, source);</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (match) {</span>
<span class="cstat-no" title="statement not covered" > matches.push({</span>
pattern: pattern.id,
name: pattern.name,
severity: pattern.severity,
...match,
});
}
} catch (error) {
// Pattern detection failed, continue with other patterns
<span class="cstat-no" title="statement not covered" > console.error(`[Bughunter] Pattern ${pattern.id} failed:`, error);</span>
}
}
// Visit children
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (cursor.gotoFirstChild()) {</span>
<span class="cstat-no" title="statement not covered" > do {</span>
<span class="cstat-no" title="statement not covered" > visit();</span>
} while (cursor.gotoNextSibling());
<span class="cstat-no" title="statement not covered" > cursor.gotoParent();</span>
}
}
<span class="cstat-no" title="statement not covered" > visit();</span>
<span class="cstat-no" title="statement not covered" > return matches;</span>
}
/**
* Calculate severity score (0-100)
*/
export function <span class="fstat-no" title="function not covered" >calculateSeverityScore(</span>bugs: BugMatch[]): number {
const weights = <span class="cstat-no" title="statement not covered" >{</span>
low: 1,
medium: 3,
high: 7,
critical: 15,
};
let totalWeight = <span class="cstat-no" title="statement not covered" >0;</span>
<span class="cstat-no" title="statement not covered" > for (const bug of bugs) {</span>
<span class="cstat-no" title="statement not covered" > totalWeight += weights[bug.severity];</span>
}
// Scale to 0-100 (100 = 20+ critical bugs)
const maxScore = <span class="cstat-no" title="statement not covered" >100;</span>
const score = <span class="cstat-no" title="statement not covered" >Math.min(100, (totalWeight / 300) * 100);</span>
<span class="cstat-no" title="statement not covered" > return Math.round(100 - score); </span>// Invert so 100 = clean, 0 = many bugs
}
</pre></td></tr></table></pre>
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