82 lines
2 KiB
JavaScript
82 lines
2 KiB
JavaScript
/**
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* @typedef {Notcl.Command[]} Notcl.Script
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* @typedef {Notcl.Word[]} Notcl.Command
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* @typedef {object} Notcl.Word
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* @property {string} text
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*/
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var Notcl = (() => {
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const { AtLeast, Choose, End, Regex, Sequence, Use } = Peg;
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const InterCommandWhitespace = Regex(/\s+/y);
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const Comment = Regex(/#.*\n/y);
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const PreCommand = AtLeast(0, Choose(InterCommandWhitespace, Comment));
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const PreWordWhitespace = Regex(/[^\S\n;]*/y);
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const BasicWord = Regex(/[^\s;]+/y).map(([word]) => ({ text: word }));
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// WIP, need to be able to escape braces correctly
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// WIP, error if anything after closing brace
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/** @type {Peg.Pattern<string>} */
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const Brace = Sequence(
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Regex(/\{/y),
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AtLeast(
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0,
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Choose(
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Use(() => Brace).map((text) => `{${text}}`),
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Regex(/[^{}]+/y).map(([text]) => text)
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)
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),
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Regex(/\}/y)
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).map(([_left, fragments, _right]) => fragments.join(""));
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const Word = Sequence(
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PreWordWhitespace,
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Choose(
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Brace.map((text) => ({ text })),
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BasicWord
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)
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).map(([_, word]) => word);
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const CommandTerminator = Sequence(
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PreWordWhitespace,
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Choose(/** @type {Peg.Pattern<unknown>} */ (Regex(/[\n;]/y)), End)
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);
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const Command = Sequence(PreCommand, AtLeast(0, Word), CommandTerminator).map(
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([_padding, words, _end]) => words
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);
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return {
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/**
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* Parse out a Notcl script into an easier-to-interpret representation.
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* No script is actually executed yet.
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*
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* @param {string} code
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* @returns Script
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*/
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parse(code) {
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/* Preprocess */
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// fold line endings
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code = code.replace(/(?<!\\)((\\\\)*)\\\n/g, "$1");
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function nextCommand() {
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const [words, nextIndex] = Command(code, 0) ?? [[], 0];
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code = code.substring(nextIndex);
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return words;
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}
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/* Loop through commands, with safety check */
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const script = /** @type {Notcl.Command[]} */ ([]);
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for (let i = 0; i < 1000 && code != ""; i++) {
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script.push(nextCommand());
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}
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return script;
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},
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};
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})();
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