nisp/lib/switch.js

A language that for easily build cross-language language

"use strict";
exports.__esModule = true;
var core_1 = require("../core");
exports["default"] = core_1.macro(function (ctx) {
    var sandbox = ctx.sandbox, ast = ctx.ast, env = ctx.env, index = ctx.index;
    ast = ast.slice(1);
    if (!ast.length) {
        return;
    }
    var defaultNode;
    if (ast[ast.length - 1][0] === 'default') {
        defaultNode = ast[ast.length - 1];
        ast = ast.slice(0, -1);
    }
    if (!ast.length) {
        return core_1["default"](defaultNode[1], sandbox, env, ctx, index);
    }
    var expressionValue;
    var hasExpression = false;
    if (ast[0][0] !== 'case') {
        expressionValue = core_1["default"](ast[0], sandbox, env, ctx, index);
        hasExpression = true;
        ast = ast.slice(1);
    }
    for (var _i = 0, ast_1 = ast; _i < ast_1.length; _i++) {
        var node = ast_1[_i];
        if (node[0] !== 'case') {
            core_1.error(ctx, 'switch unexpected identifier');
            return;
        }
        var value = core_1["default"](node[1], sandbox, env, ctx, index);
        if (hasExpression && (expressionValue === value) || !hasExpression && value) {
            return core_1["default"](node[2], sandbox, env, ctx, index);
        }
    }
    if (defaultNode) {
        return core_1["default"](defaultNode[1], sandbox, env, ctx, index);
    }
});