commit d54bfcf2bab427b6b007fc2029d8355c54b315c2 · kitten.sh/graphql-web-lite

+76
alias/language/visitor.mjs
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       import { getVisitFn, visitInParallel, BREAK } from 'graphql/language/visitor';

     

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       export { getVisitFn, visitInParallel, BREAK };

     

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       export function visit(node, visitor) {

     

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         const path = [];

     

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         const ancestors = [];

     

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         function callback(node, key, parent, isLeaving) {

     

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           const visitFn = getVisitFn(visitor, node.kind, isLeaving)

     

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           if (visitFn) {

     

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             const result = visitFn.call(visitor, node, key, parent, path, ancestors)

     

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             if (result === BREAK) throw BREAK

     

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             return result

     

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           }

     

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         }

     

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         function traverse(node, key, parent) {

     

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           let result;

     

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           result = callback(node, key, parent, false);

     

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           if (result === false) {

     

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             return;

     

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           } else if (result && typeof result.kind === 'string') {

     

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             node = result;

     

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           }

     

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           ancestors.push(node);

     

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           const copy = {};

     

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           let hasEdited = false;

     

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           for (const nodeKey in node) {

     

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             const value = node[nodeKey];

     

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             let newValue;

     

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             path.push(nodeKey);

     

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             if (Array.isArray(value)) {

     

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               newValue = value.slice();

     

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               for (let index = 0; index < value.length; index++) {

     

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                 if (value[index] != null && typeof value[index].kind === 'string') {

     

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                   path.push(index);

     

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                   result = traverse(value[index], index, node);

     

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                   path.pop();

     

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                   if (result !== undefined) {

     

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                     newValue[index] = result;

     

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                     hasEdited = true;

     

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                   }

     

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                 }

     

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               }

     

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             } else if (value != null && typeof value.kind === 'string') {

     

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               result = traverse(value, nodeKey, node);

     

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               if (result !== undefined) {

     

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                 newValue = result;

     

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                 hasEdited = true;

     

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               }

     

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             }

     

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             path.pop();

     

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             copy[nodeKey] = hasEdited ? newValue : value;

     

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           }

     

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           ancestors.pop();

     

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           if (hasEdited) node = copy;

     

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           return callback(node, key, parent, true);

     

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         }

     

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         try {

     

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           const result = traverse(node);

     

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           return result !== undefined ? result : node;

     

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         } catch (error) {

     

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           if (error !== BREAK) throw error;

     

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           return node;

     

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         }

     

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       }