openrosa-xpath-evaluator/test/unit/utils.js

Wrapper for browsers' XPath evaluator with added support for OpenRosa extensions.

const { assert } = require('chai');

// Operator constants copied from extended-xpath.js
const opVals = {
    OR: 0b00000,
    AND: 0b00100,
    EQ: 0b01000,
    NE: 0b01001,
    LT: 0b01100,
    LTE: 0b01101,
    GT: 0b01110,
    GTE: 0b01111,
    PLUS: 0b10000,
    MINUS: 0b10001,
    MULT: 0b10100,
    DIV: 0b10101,
    MOD: 0b10110,
    UNION: 0b11000,
};

module.exports = {
    assertVal,
    encodeOp,
    opVals,
    wrapVal,
};

function assertVal({ v: actual }, expected) {
    if (Number.isNaN(Number(expected))) {
        assert.isNaN(actual);
    } else {
        assert.equal(actual, expected);
    }
}

function encodeOp(op) {
    switch (op) {
        case '|':
            return opVals.OR;
        case '&':
            return opVals.AND;
        case '=':
            return opVals.EQ;
        case '!=':
            return opVals.NE;
        case '<':
            return opVals.LT;
        case '<=':
            return opVals.LTE;
        case '>':
            return opVals.GT;
        case '>=':
            return opVals.GTE;
        case '+':
            return opVals.PLUS;
        case '-':
            return opVals.MINUS;
        case '*':
            return opVals.MULT;
        case '/':
            return opVals.DIV;
        case '%':
            return opVals.MOD;
        case 'union':
            return opVals.UNION;

        default:
            return undefined;
    }
}

function wrapVal(v) {
    switch (typeof v) {
        case 'boolean':
            return { t: 'bool', v };
        case 'number':
            return { t: 'num', v };
        case 'string':
            return { t: 'str', v };
        case 'object':
            if (Array.isArray(v)) {
                return { t: 'arr', v: v.map((text) => new Node(text)) };
            }
            if (v instanceof Date) {
                return { t: 'date', v };
            }
        /* falls through */
        default:
            throw new Error(`No handling for type: ${typeof v}`);
    }
}