'use strict';
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// '<(' is process substitution operator and
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// can be parsed the same as control operator
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var CONTROL = '(?:' + [
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'\\|\\|', '\\&\\&', ';;', '\\|\\&', '\\<\\(', '\\<\\<\\<', '>>', '>\\&', '<\\&', '[&;()|<>]'
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].join('|') + ')';
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var META = '|&;()<> \\t';
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var BAREWORD = '(\\\\[\'"' + META + ']|[^\\s\'"' + META + '])+';
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var SINGLE_QUOTE = '"((\\\\"|[^"])*?)"';
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var DOUBLE_QUOTE = '\'((\\\\\'|[^\'])*?)\'';
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var TOKEN = '';
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for (var i = 0; i < 4; i++) {
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TOKEN += (Math.pow(16, 8) * Math.random()).toString(16);
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}
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function parseInternal(s, env, opts) {
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var chunker = new RegExp([
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'(' + CONTROL + ')', // control chars
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'(' + BAREWORD + '|' + SINGLE_QUOTE + '|' + DOUBLE_QUOTE + ')*'
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].join('|'), 'g');
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var match = s.match(chunker).filter(Boolean);
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if (!match) {
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return [];
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}
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if (!env) {
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env = {};
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}
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if (!opts) {
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opts = {};
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}
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var commented = false;
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function getVar(_, pre, key) {
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var r = typeof env === 'function' ? env(key) : env[key];
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if (r === undefined && key != '') {
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r = '';
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} else if (r === undefined) {
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r = '$';
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}
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if (typeof r === 'object') {
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return pre + TOKEN + JSON.stringify(r) + TOKEN;
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}
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return pre + r;
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}
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return match.map(function (s, j) {
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if (commented) {
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return void undefined;
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}
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if (RegExp('^' + CONTROL + '$').test(s)) {
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return { op: s };
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}
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// Hand-written scanner/parser for Bash quoting rules:
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//
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// 1. inside single quotes, all characters are printed literally.
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// 2. inside double quotes, all characters are printed literally
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// except variables prefixed by '$' and backslashes followed by
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// either a double quote or another backslash.
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// 3. outside of any quotes, backslashes are treated as escape
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// characters and not printed (unless they are themselves escaped)
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// 4. quote context can switch mid-token if there is no whitespace
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// between the two quote contexts (e.g. all'one'"token" parses as
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// "allonetoken")
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var SQ = "'";
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var DQ = '"';
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var DS = '$';
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var BS = opts.escape || '\\';
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var quote = false;
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var esc = false;
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var out = '';
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var isGlob = false;
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var i;
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function parseEnvVar() {
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i += 1;
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var varend;
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var varname;
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// debugger
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if (s.charAt(i) === '{') {
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i += 1;
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if (s.charAt(i) === '}') {
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throw new Error('Bad substitution: ' + s.substr(i - 2, 3));
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}
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varend = s.indexOf('}', i);
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if (varend < 0) {
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throw new Error('Bad substitution: ' + s.substr(i));
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}
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varname = s.substr(i, varend - i);
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i = varend;
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} else if ((/[*@#?$!_-]/).test(s.charAt(i))) {
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varname = s.charAt(i);
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i += 1;
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} else {
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varend = s.substr(i).match(/[^\w\d_]/);
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if (!varend) {
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varname = s.substr(i);
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i = s.length;
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} else {
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varname = s.substr(i, varend.index);
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i += varend.index - 1;
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}
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}
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return getVar(null, '', varname);
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}
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for (i = 0; i < s.length; i++) {
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var c = s.charAt(i);
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isGlob = isGlob || (!quote && (c === '*' || c === '?'));
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if (esc) {
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out += c;
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esc = false;
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} else if (quote) {
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if (c === quote) {
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quote = false;
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} else if (quote == SQ) {
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out += c;
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} else { // Double quote
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if (c === BS) {
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i += 1;
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c = s.charAt(i);
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if (c === DQ || c === BS || c === DS) {
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out += c;
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} else {
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out += BS + c;
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}
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} else if (c === DS) {
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out += parseEnvVar();
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} else {
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out += c;
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}
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}
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} else if (c === DQ || c === SQ) {
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quote = c;
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} else if (RegExp('^' + CONTROL + '$').test(c)) {
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return { op: s };
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} else if ((/^#$/).test(c)) {
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commented = true;
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if (out.length) {
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return [out, { comment: s.slice(i + 1) + match.slice(j + 1).join(' ') }];
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}
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return [{ comment: s.slice(i + 1) + match.slice(j + 1).join(' ') }];
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} else if (c === BS) {
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esc = true;
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} else if (c === DS) {
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out += parseEnvVar();
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} else {
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out += c;
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}
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}
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if (isGlob) {
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return { op: 'glob', pattern: out };
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}
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return out;
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}).reduce(function (prev, arg) { // finalize parsed aruments
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if (arg === undefined) {
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return prev;
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}
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return prev.concat(arg);
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}, []);
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}
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module.exports = function parse(s, env, opts) {
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var mapped = parseInternal(s, env, opts);
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if (typeof env !== 'function') {
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return mapped;
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}
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return mapped.reduce(function (acc, s) {
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if (typeof s === 'object') {
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return acc.concat(s);
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}
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var xs = s.split(RegExp('(' + TOKEN + '.*?' + TOKEN + ')', 'g'));
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if (xs.length === 1) {
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return acc.concat(xs[0]);
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}
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return acc.concat(xs.filter(Boolean).map(function (x) {
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if (RegExp('^' + TOKEN).test(x)) {
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return JSON.parse(x.split(TOKEN)[1]);
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}
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return x;
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}));
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}, []);
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};
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