propositional/lib/transform/substitute.js

Propositional logic symbolic computation library

"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    var desc = Object.getOwnPropertyDescriptor(m, k);
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      desc = { enumerable: true, get: function() { return m[k]; } };
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    Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod;
    var result = {};
    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
    __setModuleDefault(result, mod);
    return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.substituteVariable = void 0;
const AST = __importStar(require("../syntax/ast"));
const equivalence_1 = require("../syntax/equivalence");
function substituteVariable(expression, v1, v2) {
    switch (true) {
        case expression instanceof AST.Literal:
            return (0, equivalence_1.syntacticallyEquivalent)(expression, v1) ? v2 : expression;
        case expression instanceof AST.UnaryExpression:
            return new AST.UnaryExpression(expression.operator, substituteVariable(expression.inner, v1, v2));
        case expression instanceof AST.BinaryExpression:
            return new AST.BinaryExpression(substituteVariable(expression.left, v1, v2), expression.operator, substituteVariable(expression.right, v1, v2));
    }
}
exports.substituteVariable = substituteVariable;