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'use strict';
// '<(' is process substitution operator and
// can be parsed the same as control operator
var CONTROL = '(?:' + [
'\\|\\|',
'\\&\\&',
';;',
'\\|\\&',
'\\<\\(',
'\\<\\<\\<',
'>>',
'>\\&',
'<\\&',
'[&;()|<>]'
].join('|') + ')';
var controlRE = new RegExp('^' + CONTROL + '$');
var META = '|&;()<> \\t';
var SINGLE_QUOTE = '"((\\\\"|[^"])*?)"';
var DOUBLE_QUOTE = '\'((\\\\\'|[^\'])*?)\'';
var hash = /^#$/;
var SQ = "'";
var DQ = '"';
var DS = '$';
var TOKEN = '';
var mult = 0x100000000; // Math.pow(16, 8);
for (var i = 0; i < 4; i++) {
TOKEN += (mult * Math.random()).toString(16);
}
var startsWithToken = new RegExp('^' + TOKEN);
function matchAll(s, r) {
var origIndex = r.lastIndex;
var matches = [];
var matchObj;
while ((matchObj = r.exec(s))) {
matches.push(matchObj);
if (r.lastIndex === matchObj.index) {
r.lastIndex += 1;
}
}
r.lastIndex = origIndex;
return matches;
}
function getVar(env, pre, key) {
var r = typeof env === 'function' ? env(key) : env[key];
if (typeof r === 'undefined' && key != '') {
r = '';
} else if (typeof r === 'undefined') {
r = '$';
}
if (typeof r === 'object') {
return pre + TOKEN + JSON.stringify(r) + TOKEN;
}
return pre + r;
}
function parseInternal(string, env, opts) {
if (!opts) {
opts = {};
}
var BS = opts.escape || '\\';
var BAREWORD = '(\\' + BS + '[\'"' + META + ']|[^\\s\'"' + META + '])+';
var chunker = new RegExp([
'(' + CONTROL + ')', // control chars
'(' + BAREWORD + '|' + SINGLE_QUOTE + '|' + DOUBLE_QUOTE + ')+'
].join('|'), 'g');
var matches = matchAll(string, chunker);
if (matches.length === 0) {
return [];
}
if (!env) {
env = {};
}
var commented = false;
return matches.map(function (match) {
var s = match[0];
if (!s || commented) {
return void undefined;
}
if (controlRE.test(s)) {
return { op: s };
}
// Hand-written scanner/parser for Bash quoting rules:
//
// 1. inside single quotes, all characters are printed literally.
// 2. inside double quotes, all characters are printed literally
// except variables prefixed by '$' and backslashes followed by
// either a double quote or another backslash.
// 3. outside of any quotes, backslashes are treated as escape
// characters and not printed (unless they are themselves escaped)
// 4. quote context can switch mid-token if there is no whitespace
// between the two quote contexts (e.g. all'one'"token" parses as
// "allonetoken")
var quote = false;
var esc = false;
var out = '';
var isGlob = false;
var i;
function parseEnvVar() {
i += 1;
var varend;
var varname;
var char = s.charAt(i);
if (char === '{') {
i += 1;
if (s.charAt(i) === '}') {
throw new Error('Bad substitution: ' + s.slice(i - 2, i + 1));
}
varend = s.indexOf('}', i);
if (varend < 0) {
throw new Error('Bad substitution: ' + s.slice(i));
}
varname = s.slice(i, varend);
i = varend;
} else if ((/[*@#?$!_-]/).test(char)) {
varname = char;
i += 1;
} else {
var slicedFromI = s.slice(i);
varend = slicedFromI.match(/[^\w\d_]/);
if (!varend) {
varname = slicedFromI;
i = s.length;
} else {
varname = slicedFromI.slice(0, varend.index);
i += varend.index - 1;
}
}
return getVar(env, '', varname);
}
for (i = 0; i < s.length; i++) {
var c = s.charAt(i);
isGlob = isGlob || (!quote && (c === '*' || c === '?'));
if (esc) {
out += c;
esc = false;
} else if (quote) {
if (c === quote) {
quote = false;
} else if (quote == SQ) {
out += c;
} else { // Double quote
if (c === BS) {
i += 1;
c = s.charAt(i);
if (c === DQ || c === BS || c === DS) {
out += c;
} else {
out += BS + c;
}
} else if (c === DS) {
out += parseEnvVar();
} else {
out += c;
}
}
} else if (c === DQ || c === SQ) {
quote = c;
} else if (controlRE.test(c)) {
return { op: s };
} else if (hash.test(c)) {
commented = true;
var commentObj = { comment: string.slice(match.index + i + 1) };
if (out.length) {
return [out, commentObj];
}
return [commentObj];
} else if (c === BS) {
esc = true;
} else if (c === DS) {
out += parseEnvVar();
} else {
out += c;
}
}
if (isGlob) {
return { op: 'glob', pattern: out };
}
return out;
}).reduce(function (prev, arg) { // finalize parsed arguments
// TODO: replace this whole reduce with a concat
return typeof arg === 'undefined' ? prev : prev.concat(arg);
}, []);
}
module.exports = function parse(s, env, opts) {
var mapped = parseInternal(s, env, opts);
if (typeof env !== 'function') {
return mapped;
}
return mapped.reduce(function (acc, s) {
if (typeof s === 'object') {
return acc.concat(s);
}
var xs = s.split(RegExp('(' + TOKEN + '.*?' + TOKEN + ')', 'g'));
if (xs.length === 1) {
return acc.concat(xs[0]);
}
return acc.concat(xs.filter(Boolean).map(function (x) {
if (startsWithToken.test(x)) {
return JSON.parse(x.split(TOKEN)[1]);
}
return x;
}));
}, []);
};