@the-little-books/little
Version:
72 lines • 2.39 kB
JavaScript
;
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (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.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, mod);
return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.PatternMismatch = exports.cases = void 0;
const Pattern = __importStar(require("../pattern"));
const ut = __importStar(require("../ut"));
function cases(node, cases) {
for (const entry of cases) {
if (typeof entry === "function") {
try {
const f = entry;
return f(node);
}
catch (error) {
if (error instanceof PatternMismatch) {
continue;
}
else {
throw error;
}
}
}
else {
const [pattern, handler] = entry;
if (pattern === "default") {
return handler;
}
else if (pattern === "default-gen") {
return handler();
}
else {
const result = Pattern.match(pattern, node);
if (result !== null) {
return handler(result);
}
}
}
}
throw new PatternMismatch(node, cases);
}
exports.cases = cases;
class PatternMismatch extends Error {
constructor(node, cases) {
super(ut.aline(`
|Pattern mismatch,
|node: ${ut.inspect(node)},
|cases: ${ut.inspect(cases)},
|`));
this.node = node;
this.cases = cases;
}
}
exports.PatternMismatch = PatternMismatch;
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