json-joy/esm/json-patch/op/OpTestString.js

Collection of libraries for building collaborative editing apps.

import { AbstractPredicateOp } from './AbstractPredicateOp';
import { find, formatJsonPointer } from '@jsonjoy.com/json-pointer';
import { OPCODE } from '../constants';
/**
 * @category JSON Patch Extended
 */
export class OpTestString extends AbstractPredicateOp {
    pos;
    str;
    not;
    constructor(path, pos, str, not) {
        super(path);
        this.pos = pos;
        this.str = str;
        this.not = not;
    }
    op() {
        return 'test_string';
    }
    code() {
        return OPCODE.test_string;
    }
    test(doc) {
        const { val } = find(doc, this.path);
        if (typeof val !== 'string')
            return false;
        const length = val.length;
        const start = Math.min(this.pos, length);
        const end = Math.min(this.pos + this.str.length, length);
        const test = val.substring(start, end) === this.str;
        return this.not ? !test : test;
    }
    toJson(parent) {
        const op = {
            op: 'test_string',
            path: formatJsonPointer(parent ? this.path.slice(parent.path.length) : this.path),
            pos: this.pos,
            str: this.str,
        };
        if (this.not)
            op.not = this.not;
        return op;
    }
    toCompact(parent, verbose) {
        const opcode = verbose ? 'test_string' : OPCODE.test_string;
        const path = parent ? this.path.slice(parent.path.length) : this.path;
        return this.not ? [opcode, path, this.pos, this.str, 1] : [opcode, path, this.pos, this.str];
    }
    encode(encoder, parent) {
        encoder.encodeArrayHeader(this.not ? 5 : 4);
        encoder.writer.u8(OPCODE.test_string);
        encoder.encodeArray(parent ? this.path.slice(parent.path.length) : this.path);
        encoder.encodeNumber(this.pos);
        encoder.encodeString(this.str);
        if (this.not)
            encoder.writer.u8(1);
    }
}