71 lines
1.6 KiB
JavaScript
71 lines
1.6 KiB
JavaScript
/**
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* @typedef {Command[]} Script
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* @typedef {Word[]} Command
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* @typedef {object} Word
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* @property {string} text
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*/
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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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function parseNotcl(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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/* Parse */
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function nextWord(/* TODO: null/] terminator */) {
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// Strip whitespace
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code = code.replace(/^[^\S\n;]*/, "");
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// TODO: handle all kinds of brace/substitution stuff
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const word = code.match(/^[^\s;]+/);
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if (word) {
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code = code.substring(word[0].length);
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return { text: word[0] };
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} else {
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return null;
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}
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}
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function nextCommand(/* TODO: null/] terminator */) {
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const command = /** @type {Word[]} */ ([]);
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while (true) {
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// Strip whitespace
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code = code.replace(/^\s*/, "");
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// Strip comments
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if (code[0] == "#") {
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code = code.replace(/^.*\n/, "");
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continue;
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}
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// Strip semicolons
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if (code[0] == ";") {
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code = code.substring(1);
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continue;
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}
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break;
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}
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while (true) {
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const word = nextWord();
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if (word) {
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command.push(word);
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continue;
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}
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break;
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}
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return command;
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}
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/* Loop through commands, with safety check */
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const script = /** @type {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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