我正在尝试为 Minecraft 函数语法创建一个树保姆。
该语言的结构如下所示：
command @e[key=value] other args
在上面的示例中，我对第二个参数（目标选择器）中的值有疑问。这个值可以是很多东西，比如字符串、数字、布尔值和两个类似的对象结构（NBT 和记分牌对象）。
以下是每个示例：
NBT
{key:value}
记分牌对象
{key=number} // where number is: N, ..N, N.., or N..N
我的语法文件包含以下代码：
// unrelated code removed
module.exports = grammar({
name: "mcfunction",
rules: {
root: $ => repeat(
choice(
$.command
)
),
command: $ => prec.right(seq(
field("command_name", $.identifier),
repeat(
choice(
$.selector
)
),
"\n"
)),
identifier: $ => /[A-Za-z][\w-]+/,
number: $ => prec(1, /-?\d+(\.\d+)?/),
boolean: $ => choice(
"true",
"false"
),
string: $ => seq(
"\"",
repeat(
choice(
$._escape_sequence,
/[^"]/
)
),
"\""
),
_escape_sequence: $ => seq("\\", "\""),
selector: $ => seq(
token(
seq(
"@",
choice(
"p", "a", "e", "s", "r"
)
)
),
optional(
seq(
token.immediate("["),
optional(
repeat(
seq(
$.selector_option,
optional(",")
)
)
),
"]"
)
),
),
selector_option: $ => seq(
$.selector_key,
"=",
$.selector_value
),
selector_key: $ => /[a-z_-]+/,
selector_value: $ => choice(
$.item,
$.path,
$.selector_key,
$.selector_number,
$.number,
$.boolean,
$.selector_object
),
selector_number: $ => prec.right(1, choice(
seq(
"..",
$.number
),
seq(
$.number,
"..",
$.number
),
seq(
$.number,
".."
),
$.number
)),
selector_object: $ => choice(
seq(
"{",
repeat(
seq(
$.selector_score,
optional(",")
)
),
"}"
),
seq(
"{",
repeat(
seq(
$.selector_nbt,
optional(",")
)
),
"}"
)
),
selector_nbt: $ => seq(
$.nbt_object_key,
":",
$.nbt_object_value
),
selector_score: $ => seq(
field("selector_score_key", $.selector_key),
"=",
field("selector_score_value", $.selector_number)
),
_namespace: $ => /[a-z_-]+:/,
item: $ => seq(
$._namespace,
$.selector_key
),
path: $ => seq(
choice($.item, /[a-z_]+/),
repeat1(
token("/", /[a-z_]/)
)
),
nbt: $ => choice(
$.nbt_array,
$.nbt_object
),
nbt_object: $ => seq(
"{",
repeat(
seq(
$.nbt_object_key,
":",
$.nbt_object_value,
optional(",")
)
),
"}"
),
nbt_array: $ => seq(
"[",
repeat(
seq(
$.nbt_object_value,
optional(",")
)
),
"]"
),
nbt_object_key: $ => choice(
$.string,
$.number,
$.identifier
),
nbt_object_value: $ => choice(
$.string,
$.nbt_number,
$.boolean,
$.nbt
),
nbt_number: $ => seq(
$.number,
field("nbt_number_suffix", optional(choice("l","s","d","f","b")))
)
}
});
但是，如果我编译和解析test @e[scores={example=1..}]，我会得到：
(root [0, 0] - [6, 0]
(command [0, 0] - [1, 0]
command_name: (identifier [0, 0] - [0, 4])
(selector [0, 5] - [0, 29]
(selector_option [0, 8] - [0, 28]
(selector_key [0, 8] - [0, 14])
(selector_value [0, 15] - [0, 28]
(selector_object [0, 15] - [0, 28]
(ERROR [0, 16] - [0, 27]
(nbt_object_key [0, 16] - [0, 23]
(identifier [0, 16] - [0, 23]))))))))
tests/test.mcfunction 0 ms (ERROR [0, 16] - [0, 27])
预期：而不是ERROR，它应该是selector_score，并且应该有一个score_keyand score_value。
selector_nbt如果我从中删除序列，则不会发生这种情况selector_object。但是，如果在使用 nbt 数据的命令上运行解析（使用两个序列或仅使用selector_nbt），则不会出现错误。
我究竟做错了什么？