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43 lines
1.1 KiB
JavaScript
43 lines
1.1 KiB
JavaScript
"use strict";
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const assert = require("assert");
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const acceptableFirstCharacters = /^[a-zA-Z_]$/;
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const acceptableSubsequentCharacters = /^[0-9a-zA-Z_]$/;
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// This function deterministically and statelessly translates a name such that it is guaranteed to be valid in all identifier positions in JS.
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// TODO: This can probably be made more performant...
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function mangleCharacter(character) {
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return (character === "$")
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? "$$"
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: `$${character.codePointAt(0)}`
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}
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module.exports = function mangleName(name) {
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assert(name.length > 0);
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// FIXME: Tag an identifier of this type with an internal property instead
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if (name.startsWith("$$jsNix$")) {
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return name;
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} else {
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let completedFirstCharacter = false;
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return Array.from(name)
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.map((character) => {
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if (!completedFirstCharacter) {
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completedFirstCharacter = true;
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return (acceptableFirstCharacters.test(character))
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? character
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: mangleCharacter(character);
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} else {
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return (acceptableSubsequentCharacters.test(character))
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? character
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: mangleCharacter(character);
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}
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})
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.join("");
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}
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};
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