53 lines
1.6 KiB
JavaScript
53 lines
1.6 KiB
JavaScript
"use strict";
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var isValue = require("../../object/is-value")
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, esniff = require("esniff")
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, validFunction = require("../valid-function");
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var classRe = /^\s*class[\s{/}]/;
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module.exports = function () {
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var str = String(validFunction(this));
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if (classRe.test(str)) throw new Error("Class methods are not supported");
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var argsStartIndex
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, argsEndIndex
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, bodyStartIndex
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, bodyEndReverseIndex = -1
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, shouldTrimArgs = false;
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esniff(str, function (emitter, accessor) {
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emitter.once("trigger:(", function () { argsStartIndex = accessor.index + 1; });
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emitter.once("trigger:=", function () {
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if (isValue(argsStartIndex)) return;
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argsStartIndex = 0;
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argsEndIndex = accessor.index;
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shouldTrimArgs = true;
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if (!accessor.skipCodePart("=>")) {
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throw new Error("Unexpected function string: " + str);
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}
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accessor.skipWhitespace();
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if (!accessor.skipCodePart("{")) bodyEndReverseIndex = Infinity;
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bodyStartIndex = accessor.index;
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});
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emitter.on("trigger:)", function () {
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if (accessor.scopeDepth) return;
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argsEndIndex = accessor.index;
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accessor.skipCodePart(")");
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accessor.skipWhitespace();
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if (accessor.skipCodePart("=>")) {
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accessor.skipWhitespace();
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if (!accessor.skipCodePart("{")) bodyEndReverseIndex = Infinity;
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} else if (!accessor.skipCodePart("{")) {
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throw new Error("Unexpected function string: " + str);
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}
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bodyStartIndex = accessor.index;
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accessor.stop();
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});
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});
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var argsString = str.slice(argsStartIndex, argsEndIndex);
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if (shouldTrimArgs) argsString = argsString.trim();
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return { args: argsString, body: str.slice(bodyStartIndex, bodyEndReverseIndex) };
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};
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