jeb/test.json at main · r47onfire/jeb · GitHub

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[
    "define",
    true,
    [
        "try",
        "body",
        "handlers"
    ],
    "[\"try\", <body>, <handlers>]\n\nCatches and handles errors. The `handlers` is an object mapping error type to handler; it will be expanded using [[obj]].\nDuring evaluation of the body, if an error is thrown, the error's `type` (as returned by [[with]]) will be checked to see if it's in the handlers, and if it is, the handler is called with the `message` and `context` of the error.\nIf no handler directly matches, the special catch-all handler `\"\\*\"` is tried, and if it exists, it is called with `type`, `message` and `context`.\nIn both cases if the handler exists, `true` is returned to [[with]] to stop propagation of the error. If the handler wants to propagate the error, it should re-throw it using [[error]].\nIf `body` exits cleanly with no error, the special `\"else\"` handler is called with no arguments, if present.",
    [
        "quasiquote",
        [
            "let",
            [
                [
                    "handlers",
                    [
                        "obj",
                        [
                            "unquote",
                            [
                                "$",
                                "handlers"
                            ]
                        ]
                    ]
                ]
            ],
            [
                "with",
                null,
                {
                    "exit": [
                        "lambda",
                        [
                            "k",
                            "type",
                            "value",
                            "ctx"
                        ],
                        [
                            "let",
                            [
                                [
                                    "handler",
                                    [
                                        "$",
                                        [
                                            "handlers",
                                            [
                                                "$",
                                                "type"
                                            ]
                                        ]
                                    ]
                                ],
                                [
                                    "starHandler",
                                    [
                                        "$",
                                        [
                                            "handlers",
                                            "*"
                                        ]
                                    ]
                                ],
                                [
                                    "elseHandler",
                                    [
                                        "$",
                                        [
                                            "handlers",
                                            "else"
                                        ]
                                    ]
                                ]
                            ],
                            [
                                "unless",
                                [
                                    "$",
                                    "type"
                                ],
                                [
                                    "when",
                                    [
                                        "$",
                                        "elseHandler"
                                    ],
                                    [
                                        "elseHandler"
                                    ]
                                ],
                                [
                                    "comment",
                                    "only returning true to prevent further execution, the return value is ignored in this context."
                                ],
                                [
                                    "return",
                                    true
                                ]
                            ],
                            [
                                "when",
                                [
                                    "$",
                                    "handler"
                                ],
                                [
                                    "handler",
                                    [
                                        "$",
                                        "value"
                                    ],
                                    [
                                        "$",
                                        "ctx"
                                    ]
                                ],
                                [
                                    "return",
                                    true
                                ]
                            ],
                            [
                                "when",
                                [
                                    "$",
                                    "starHandler"
                                ],
                                [
                                    "starHandler",
                                    [
                                        "$",
                                        "type"
                                    ],
                                    [
                                        "$",
                                        "value"
                                    ],
                                    [
                                        "$",
                                        "ctx"
                                    ]
                                ],
                                [
                                    "return",
                                    true
                                ]
                            ],
                            false
                        ]
                    ]
                },
                [
                    "unquote",
                    [
                        "$",
                        "body"
                    ]
                ]
            ]
        ]
    ]
]