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gradio_app
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import { adoptBuffer } from './adopt-buffer.js';
import { isBOM } from './char-code-definitions.js';

const N = 10;
const F = 12;
const R = 13;

function computeLinesAndColumns(host) {
    const source = host.source;
    const sourceLength = source.length;
    const startOffset = source.length > 0 ? isBOM(source.charCodeAt(0)) : 0;
    const lines = adoptBuffer(host.lines, sourceLength);
    const columns = adoptBuffer(host.columns, sourceLength);
    let line = host.startLine;
    let column = host.startColumn;

    for (let i = startOffset; i < sourceLength; i++) {
        const code = source.charCodeAt(i);

        lines[i] = line;
        columns[i] = column++;

        if (code === N || code === R || code === F) {
            if (code === R && i + 1 < sourceLength && source.charCodeAt(i + 1) === N) {
                i++;
                lines[i] = line;
                columns[i] = column;
            }

            line++;
            column = 1;
        }
    }

    lines[sourceLength] = line;
    columns[sourceLength] = column;

    host.lines = lines;
    host.columns = columns;
    host.computed = true;
}

export class OffsetToLocation {
    constructor() {
        this.lines = null;
        this.columns = null;
        this.computed = false;
    }
    setSource(source, startOffset = 0, startLine = 1, startColumn = 1) {
        this.source = source;
        this.startOffset = startOffset;
        this.startLine = startLine;
        this.startColumn = startColumn;
        this.computed = false;
    }
    getLocation(offset, filename) {
        if (!this.computed) {
            computeLinesAndColumns(this);
        }

        return {
            source: filename,
            offset: this.startOffset + offset,
            line: this.lines[offset],
            column: this.columns[offset]
        };
    }
    getLocationRange(start, end, filename) {
        if (!this.computed) {
            computeLinesAndColumns(this);
        }

        return {
            source: filename,
            start: {
                offset: this.startOffset + start,
                line: this.lines[start],
                column: this.columns[start]
            },
            end: {
                offset: this.startOffset + end,
                line: this.lines[end],
                column: this.columns[end]
            }
        };
    }
};