@eagleoutice/flowr-dev/project/incremental/incremental-parse/incremental-parse.js

Static Dataflow Analyzer and Program Slicer for the R Programming Language

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.computeReparseInfo = computeReparseInfo;
const edit_computation_1 = require("./edit-computation");
/**
 * Computes the information needed to reparse a file incrementally with tree-sitter.
 * Returns `undefined` if incremental reparsing is not possible.
 */
function computeReparseInfo(ctx, filePath) {
    const previousTree = ctx.inc.getOldParseResultOf(filePath);
    if (!previousTree) {
        // this file was not parsed before
        return undefined;
    }
    const oldContent = ctx.inc.getOldContentOf(filePath);
    if (oldContent === undefined) {
        // this file has not been invalidated since the last parse, no reparse needed
        return {
            previousTree,
            editRegion: undefined
        };
    }
    const newContent = ctx.files.resolveRequest({ request: 'file', content: filePath }).r.content;
    if (newContent === oldContent) {
        // this file was invalidated, but the content did not change, no reparse needed
        return {
            previousTree,
            editRegion: undefined
        };
    }
    const editRegion = (0, edit_computation_1.computeEditRegion)(oldContent, newContent);
    return {
        previousTree,
        editRegion
    };
}
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