@graphql-tools/stitching-directives
Version:
A set of utils for faster development of GraphQL tools
32 lines (31 loc) • 1.52 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.preparseMergeArgsExpr = exports.EXPANSION_PREFIX = exports.KEY_DELIMITER = void 0;
exports.KEY_DELIMITER = '__dot__';
exports.EXPANSION_PREFIX = '__exp';
function preparseMergeArgsExpr(mergeArgsExpr) {
const variableRegex = /\$[_A-Za-z][_A-Za-z0-9.]*/g;
const dotRegex = /\./g;
mergeArgsExpr = mergeArgsExpr.replace(variableRegex, variable => variable.replace(dotRegex, exports.KEY_DELIMITER));
const segments = mergeArgsExpr.split('[[');
const expansionExpressions = Object.create(null);
if (segments.length === 1) {
return { mergeArgsExpr, expansionExpressions };
}
let finalSegments = [segments[0]];
for (let i = 1; i < segments.length; i++) {
const additionalSegments = segments[i].split(']]');
if (additionalSegments.length !== 2) {
throw new Error(`Each opening "[[" must be matched by a closing "]]" without nesting.`);
}
finalSegments = finalSegments.concat(additionalSegments);
}
let finalMergeArgsExpr = finalSegments[0];
for (let i = 1; i < finalSegments.length - 1; i += 2) {
const variableName = `${exports.EXPANSION_PREFIX}${(i - 1) / 2 + 1}`;
expansionExpressions[variableName] = finalSegments[i];
finalMergeArgsExpr += `\$${variableName}${finalSegments[i + 1]}`;
}
return { mergeArgsExpr: finalMergeArgsExpr, expansionExpressions };
}
exports.preparseMergeArgsExpr = preparseMergeArgsExpr;