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* AST Utility Functions
*
* Helper functions for diffing and merging AST objects
*/
/**
* Deep diff two objects
* @param {Object} obj1 - First object
* @param {Object} obj2 - Second object to compare against
* @returns {Object} Diff result with summary and detailed changes
*/
export function diffObjects(obj1, obj2) {
const result = {
summary: {
added: 0,
removed: 0,
modified: 0,
unchanged: 0
},
changes: {}
};
// Collect all keys from both objects
const allKeys = new Set([
...Object.keys(obj1 || {}),
...Object.keys(obj2 || {})
]);
for (const key of allKeys) {
const val1 = obj1?.[key];
const val2 = obj2?.[key];
// Key only in obj2 - added
Iif (!(key in obj1)) {
result.summary.added++;
result.changes[key] = {
status: 'added',
value: val2
};
continue;
}
// Key only in obj1 - removed
Iif (!(key in obj2)) {
result.summary.removed++;
result.changes[key] = {
status: 'removed',
value: val1
};
continue;
}
// Both have the key - compare values
if (isObject(val1) && isObject(val2)) {
// Recursive diff for nested objects
const nestedDiff = diffObjects(val1, val2);
if (Object.keys(nestedDiff.changes).length > 0) {
result.summary.modified += nestedDiff.summary.modified;
result.summary.added += nestedDiff.summary.added;
result.summary.removed += nestedDiff.summary.removed;
result.summary.unchanged += nestedDiff.summary.unchanged;
result.changes[key] = nestedDiff;
} else {
result.summary.unchanged++;
}
} else if (Array.isArray(val1) && Array.isArray(val2)) {
// Array comparison - treat empty vs non-empty as added/removed
const isEmpty1 = val1.length === 0;
const isEmpty2 = val2.length === 0;
if (isEmpty1 && !isEmpty2) {
// Added: source has items, target empty
result.summary.added++;
result.changes[key] = {
status: 'added',
value: val2
};
} else if (!isEmpty1 && isEmpty2) {
// Removed: target had items, source empty
result.summary.removed++;
result.changes[key] = {
status: 'removed',
value: val1
};
} else Iif (JSON.stringify(val1) !== JSON.stringify(val2)) {
// Both non-empty and different -> modified
result.summary.modified++;
result.changes[key] = {
status: 'modified',
oldValue: val1,
newValue: val2
};
} else {
result.summary.unchanged++;
}
} else if (val1 !== val2) {
// Primitive value difference
result.summary.modified++;
result.changes[key] = {
status: 'modified',
oldValue: val1,
newValue: val2
};
} else {
// No change
result.summary.unchanged++;
}
}
return result;
}
/**
* Merge two objects with strategy
* @param {Object} target - Target object (values preserved based on strategy)
* @param {Object} source - Source object (values to merge in)
* @param {string} strategy - Merge strategy: 'canonical', 'preserve', 'timestamp'
* @returns {Object} Merged object
*/
export function mergeObjects(target, source, strategy = 'canonical') {
const result = { ...target };
for (const key of Object.keys(source || {})) {
const targetVal = target?.[key];
const sourceVal = source[key];
// Skip if source value is undefined/null
Iif (sourceVal === undefined || sourceVal === null) {
continue;
}
// Key not in target - add from source
Iif (!(key in target) || targetVal === undefined || targetVal === null) {
result[key] = deepClone(sourceVal);
continue;
}
// Both values are objects - recurse
if (isObject(targetVal) && isObject(sourceVal)) {
result[key] = mergeObjects(targetVal, sourceVal, strategy);
continue;
}
// Arrays - merge based on strategy
if (Array.isArray(targetVal) && Array.isArray(sourceVal)) {
if (strategy === 'preserve') {
// Keep target unless target is empty, then adopt source
if (targetVal.length === 0) {
result[key] = deepClone(sourceVal);
} else {
result[key] = deepClone(targetVal);
}
} else if (strategy === 'timestamp') {
// Use source (assumed newer)
result[key] = deepClone(sourceVal);
} else {
// Canonical: prefer target, but if target is empty, use source
if (targetVal.length === 0) {
result[key] = deepClone(sourceVal);
} else {
result[key] = deepClone(targetVal);
}
}
continue;
}
// Primitive values - use strategy
if (strategy === 'preserve') {
// Keep target value
result[key] = targetVal;
} else if (strategy === 'timestamp') {
// Use source value (assumed newer)
result[key] = sourceVal;
} else {
// Canonical: prefer target
result[key] = targetVal;
}
}
return result;
}
/**
* Check if value is a plain object (not array, not null)
* @param {*} value
* @returns {boolean}
*/
function isObject(value) {
return typeof value === 'object' &&
value !== null &&
!Array.isArray(value) &&
!(value instanceof Date) &&
!(value instanceof RegExp);
}
/**
* Deep clone a value
* @param {*} value
* @returns {*}
*/
export function deepClone(value) {
if (value === null || typeof value !== 'object') {
return value;
}
if (Array.isArray(value)) {
return value.map(item => deepClone(item));
}
const cloned = {};
for (const key of Object.keys(value)) {
cloned[key] = deepClone(value[key]);
}
return cloned;
}
/**
* Format a diff result as a readable string
* @param {Object} diff - Diff result from diffObjects
* @param {string} indent - Indentation for nested output
* @returns {string} Formatted diff string
*/
export function formatDiff(diff, indent = '') {
const lines = [];
// Summary
const { summary } = diff;
lines.push(`${indent}Summary:`);
lines.push(`${indent} Added: ${summary.added}`);
lines.push(`${indent} Removed: ${summary.removed}`);
lines.push(`${indent} Modified: ${summary.modified}`);
lines.push(`${indent} Unchanged: ${summary.unchanged}`);
// Changes
if (Object.keys(diff.changes).length > 0) {
lines.push(`${indent}Changes:`);
formatChanges(diff.changes, lines, indent + ' ');
}
return lines.join('\n');
}
/**
* Format changes recursively
* @private
*/
function formatChanges(changes, lines, indent) {
for (const [key, change] of Object.entries(changes)) {
if (change.status) {
// Leaf change
if (change.status === 'added') {
lines.push(`${indent}+ ${key}: ${JSON.stringify(change.value)}`);
} else if (change.status === 'removed') {
lines.push(`${indent}- ${key}: ${JSON.stringify(change.value)}`);
} else if (change.status === 'modified') {
lines.push(`${indent}* ${key}:`);
lines.push(`${indent} - ${JSON.stringify(change.oldValue)}`);
lines.push(`${indent} + ${JSON.stringify(change.newValue)}`);
}
} else {
// Nested diff
const hasChanges = Object.values(change).some(
c => c.status || (c.summary && (c.summary.added + c.summary.removed + c.summary.modified) > 0)
);
if (hasChanges) {
lines.push(`${indent}${key}/`);
formatChanges(change.changes || change, lines, indent + ' ');
}
}
}
}
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