graphql-language-service/esm/utils/getASTNodeAtPosition.js

The official, runtime independent Language Service for GraphQL

import { visit } from 'graphql';
export function getASTNodeAtPosition(query, ast, point) {
    const offset = pointToOffset(query, point);
    let nodeContainingPosition;
    visit(ast, {
        enter(node) {
            if (node.kind !== 'Name' &&
                node.loc &&
                node.loc.start <= offset &&
                offset <= node.loc.end) {
                nodeContainingPosition = node;
            }
            else {
                return false;
            }
        },
        leave(node) {
            if (node.loc && node.loc.start <= offset && offset <= node.loc.end) {
                return false;
            }
        },
    });
    return nodeContainingPosition;
}
export function pointToOffset(text, point) {
    const linesUntilPosition = text.split('\n').slice(0, point.line);
    return (point.character +
        linesUntilPosition
            .map(line => line.length + 1)
            .reduce((a, b) => a + b, 0));
}
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