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79 lines
2.2 KiB
JavaScript
79 lines
2.2 KiB
JavaScript
"use strict";
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// Simple data type to represent a query path and corresponding schema path tied together, because these are basically always used together, and it would bloat up the implementation code otherwise
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function createInstance({ queryPath, schemaPath, queryObject, schemaObject, parent }) {
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let self;
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// eslint-disable-next-line no-return-assign
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return self = {
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queryPath: queryPath,
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schemaPath: schemaPath,
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query: queryObject,
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schema: schemaObject,
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child: function (queryKey) {
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let newQueryPath = (queryKey != null)
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? queryPath.concat([ queryKey ])
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: queryPath;
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let newQueryObject = (queryKey != null)
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? queryObject[queryKey]
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: queryObject;
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// TODO: Is this correct even when the queryKey is null, and so we remain at the same object?
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// $key is used for handling aliases
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let effectiveSchemaKey = (newQueryObject?.$key != null)
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? newQueryObject.$key
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: queryKey;
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let newSchemaPath = (effectiveSchemaKey != null)
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? schemaPath.concat([ effectiveSchemaKey ])
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: schemaPath;
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let newSchemaObject = (effectiveSchemaKey != null)
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? schemaObject[effectiveSchemaKey]
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: schemaObject;
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return createInstance({
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queryPath: newQueryPath,
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schemaPath: newSchemaPath,
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queryObject: newQueryObject,
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schemaObject: newSchemaObject,
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parent: self
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});
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},
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parent: parent,
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override: function ({ query, schema }) {
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return createInstance({
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queryPath: queryPath,
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schemaPath: schemaPath,
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queryObject: query ?? queryObject,
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schemaObject: schema ?? schemaObject,
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// An override doesn't change the path, so the parent shouldn't change either
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parent: self.parent
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});
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},
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toPathString: function () {
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return queryPath
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.map((segment, i) => {
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if (segment === schemaPath[i]) {
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return segment;
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} else {
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// This is used for representing aliases, showing the original schema key in brackets
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return `${segment} [${schemaPath[i]}]`;
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}
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})
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.join(" -> ");
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}
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};
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}
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module.exports = function createCursor({ query, schema }) {
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return createInstance({
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queryPath: [],
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schemaPath: [],
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queryObject: query,
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schemaObject: schema,
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parent: undefined
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});
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};
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