me like nix
1'use strict';
2
3// '<(' is process substitution operator and
4// can be parsed the same as control operator
5var CONTROL = '(?:' + [
6 '\\|\\|',
7 '\\&\\&',
8 ';;',
9 '\\|\\&',
10 '\\<\\(',
11 '\\<\\<\\<',
12 '>>',
13 '>\\&',
14 '<\\&',
15 '[&;()|<>]'
16].join('|') + ')';
17var controlRE = new RegExp('^' + CONTROL + '$');
18var META = '|&;()<> \\t';
19var SINGLE_QUOTE = '"((\\\\"|[^"])*?)"';
20var DOUBLE_QUOTE = '\'((\\\\\'|[^\'])*?)\'';
21var hash = /^#$/;
22
23var SQ = "'";
24var DQ = '"';
25var DS = '$';
26
27var TOKEN = '';
28var mult = 0x100000000; // Math.pow(16, 8);
29for (var i = 0; i < 4; i++) {
30 TOKEN += (mult * Math.random()).toString(16);
31}
32var startsWithToken = new RegExp('^' + TOKEN);
33
34function matchAll(s, r) {
35 var origIndex = r.lastIndex;
36
37 var matches = [];
38 var matchObj;
39
40 while ((matchObj = r.exec(s))) {
41 matches.push(matchObj);
42 if (r.lastIndex === matchObj.index) {
43 r.lastIndex += 1;
44 }
45 }
46
47 r.lastIndex = origIndex;
48
49 return matches;
50}
51
52function getVar(env, pre, key) {
53 var r = typeof env === 'function' ? env(key) : env[key];
54 if (typeof r === 'undefined' && key != '') {
55 r = '';
56 } else if (typeof r === 'undefined') {
57 r = '$';
58 }
59
60 if (typeof r === 'object') {
61 return pre + TOKEN + JSON.stringify(r) + TOKEN;
62 }
63 return pre + r;
64}
65
66function parseInternal(string, env, opts) {
67 if (!opts) {
68 opts = {};
69 }
70 var BS = opts.escape || '\\';
71 var BAREWORD = '(\\' + BS + '[\'"' + META + ']|[^\\s\'"' + META + '])+';
72
73 var chunker = new RegExp([
74 '(' + CONTROL + ')', // control chars
75 '(' + BAREWORD + '|' + SINGLE_QUOTE + '|' + DOUBLE_QUOTE + ')+'
76 ].join('|'), 'g');
77
78 var matches = matchAll(string, chunker);
79
80 if (matches.length === 0) {
81 return [];
82 }
83 if (!env) {
84 env = {};
85 }
86
87 var commented = false;
88
89 return matches.map(function (match) {
90 var s = match[0];
91 if (!s || commented) {
92 return void undefined;
93 }
94 if (controlRE.test(s)) {
95 return { op: s };
96 }
97
98 // Hand-written scanner/parser for Bash quoting rules:
99 //
100 // 1. inside single quotes, all characters are printed literally.
101 // 2. inside double quotes, all characters are printed literally
102 // except variables prefixed by '$' and backslashes followed by
103 // either a double quote or another backslash.
104 // 3. outside of any quotes, backslashes are treated as escape
105 // characters and not printed (unless they are themselves escaped)
106 // 4. quote context can switch mid-token if there is no whitespace
107 // between the two quote contexts (e.g. all'one'"token" parses as
108 // "allonetoken")
109 var quote = false;
110 var esc = false;
111 var out = '';
112 var isGlob = false;
113 var i;
114
115 function parseEnvVar() {
116 i += 1;
117 var varend;
118 var varname;
119 var char = s.charAt(i);
120
121 if (char === '{') {
122 i += 1;
123 if (s.charAt(i) === '}') {
124 throw new Error('Bad substitution: ' + s.slice(i - 2, i + 1));
125 }
126 varend = s.indexOf('}', i);
127 if (varend < 0) {
128 throw new Error('Bad substitution: ' + s.slice(i));
129 }
130 varname = s.slice(i, varend);
131 i = varend;
132 } else if ((/[*@#?$!_-]/).test(char)) {
133 varname = char;
134 i += 1;
135 } else {
136 var slicedFromI = s.slice(i);
137 varend = slicedFromI.match(/[^\w\d_]/);
138 if (!varend) {
139 varname = slicedFromI;
140 i = s.length;
141 } else {
142 varname = slicedFromI.slice(0, varend.index);
143 i += varend.index - 1;
144 }
145 }
146 return getVar(env, '', varname);
147 }
148
149 for (i = 0; i < s.length; i++) {
150 var c = s.charAt(i);
151 isGlob = isGlob || (!quote && (c === '*' || c === '?'));
152 if (esc) {
153 out += c;
154 esc = false;
155 } else if (quote) {
156 if (c === quote) {
157 quote = false;
158 } else if (quote == SQ) {
159 out += c;
160 } else { // Double quote
161 if (c === BS) {
162 i += 1;
163 c = s.charAt(i);
164 if (c === DQ || c === BS || c === DS) {
165 out += c;
166 } else {
167 out += BS + c;
168 }
169 } else if (c === DS) {
170 out += parseEnvVar();
171 } else {
172 out += c;
173 }
174 }
175 } else if (c === DQ || c === SQ) {
176 quote = c;
177 } else if (controlRE.test(c)) {
178 return { op: s };
179 } else if (hash.test(c)) {
180 commented = true;
181 var commentObj = { comment: string.slice(match.index + i + 1) };
182 if (out.length) {
183 return [out, commentObj];
184 }
185 return [commentObj];
186 } else if (c === BS) {
187 esc = true;
188 } else if (c === DS) {
189 out += parseEnvVar();
190 } else {
191 out += c;
192 }
193 }
194
195 if (isGlob) {
196 return { op: 'glob', pattern: out };
197 }
198
199 return out;
200 }).reduce(function (prev, arg) { // finalize parsed arguments
201 // TODO: replace this whole reduce with a concat
202 return typeof arg === 'undefined' ? prev : prev.concat(arg);
203 }, []);
204}
205
206module.exports = function parse(s, env, opts) {
207 var mapped = parseInternal(s, env, opts);
208 if (typeof env !== 'function') {
209 return mapped;
210 }
211 return mapped.reduce(function (acc, s) {
212 if (typeof s === 'object') {
213 return acc.concat(s);
214 }
215 var xs = s.split(RegExp('(' + TOKEN + '.*?' + TOKEN + ')', 'g'));
216 if (xs.length === 1) {
217 return acc.concat(xs[0]);
218 }
219 return acc.concat(xs.filter(Boolean).map(function (x) {
220 if (startsWithToken.test(x)) {
221 return JSON.parse(x.split(TOKEN)[1]);
222 }
223 return x;
224 }));
225 }, []);
226};