| 1 | export const KEY_DELIMITER = '__dot__';
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| 2 | export const EXPANSION_PREFIX = '__exp';
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| 3 | export function preparseMergeArgsExpr(mergeArgsExpr) {
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| 4 | const variableRegex = /\$[_A-Za-z][_A-Za-z0-9.]*/g;
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| 5 | const dotRegex = /\./g;
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| 6 | mergeArgsExpr = mergeArgsExpr.replace(variableRegex, variable => variable.replace(dotRegex, KEY_DELIMITER));
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| 7 | const segments = mergeArgsExpr.split('[[');
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| 8 | const expansionExpressions = Object.create(null);
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| 9 | if (segments.length === 1) {
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| 10 | return { mergeArgsExpr, expansionExpressions };
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| 11 | }
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| 12 | let finalSegments = [segments[0]];
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| 13 | for (let i = 1; i < segments.length; i++) {
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| 14 | const additionalSegments = segments[i].split(']]');
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| 15 | if (additionalSegments.length !== 2) {
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| 16 | throw new Error(`Each opening "[[" must be matched by a closing "]]" without nesting.`);
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| 17 | }
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| 18 | finalSegments = finalSegments.concat(additionalSegments);
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| 19 | }
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| 20 | let finalMergeArgsExpr = finalSegments[0];
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| 21 | for (let i = 1; i < finalSegments.length - 1; i += 2) {
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| 22 | const variableName = `${EXPANSION_PREFIX}${(i - 1) / 2 + 1}`;
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| 23 | expansionExpressions[variableName] = finalSegments[i];
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| 24 | finalMergeArgsExpr += `\$${variableName}${finalSegments[i + 1]}`;
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| 25 | }
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| 26 | return { mergeArgsExpr: finalMergeArgsExpr, expansionExpressions };
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| 27 | }
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