-
Notifications
You must be signed in to change notification settings - Fork 0
/
rocambole-linebreak.js
225 lines (180 loc) · 5.43 KB
/
rocambole-linebreak.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
'use strict';
// Line break helpers
var _tk = require('rocambole-token');
var debug = require('debug');
var debugBefore = debug('rocambole:br:before');
var debugAfter = debug('rocambole:br:after');
var debugBetween = debug('rocambole:br:between');
// yeah, we use semver to parse integers. it's lame but works and will give
// more flexibility while still keeping a format that is easy to read
var semver = require('semver');
// fallback in case plugin author forgets to call setOptions
var _curOpts = {
value: '\n'
};
// ---
exports.setOptions = setOptions;
function setOptions(opts) {
_curOpts = opts;
}
exports.limit = limit;
function limit(token, typeOrValue) {
limitBefore(token, typeOrValue);
limitAfter(token, typeOrValue);
}
exports.limitBefore = limitBefore;
function limitBefore(token, typeOrValue) {
var expected = expectedBefore(typeOrValue);
debugBefore(
'typeOrValue: %s, expected: %s, value: %s',
typeOrValue, expected, token && token.value
);
if (expected < 0) return; // noop
var start = getStartToken(token);
limitInBetween('before', start, token, expected);
}
exports.limitAfter = limitAfter;
function limitAfter(token, typeOrValue) {
var expected = expectedAfter(typeOrValue);
debugAfter(
'typeOrValue: %s, expected: %s, value: %s',
typeOrValue, expected, token && token.value
);
if (expected < 0) return; // noop
var end = getEndToken(token);
limitInBetween('after', token, end, expected);
}
exports.expectedBefore = expectedBefore;
function expectedBefore(typeOrValue) {
return getExpect('before', typeOrValue);
}
exports.expectedAfter = expectedAfter;
function expectedAfter(typeOrValue) {
return getExpect('after', typeOrValue);
}
function getExpect(location, typeOrValue) {
var expected;
// we allow expected value (number) as 2nd argument or the node type (string)
if (typeof typeOrValue === 'string') {
expected = _curOpts[location][typeOrValue];
} else {
expected = typeOrValue;
}
// default is noop, explicit is better than implicit
expected = expected != null ? expected : -1;
if (typeof expected === 'boolean') {
// if user sets booleans by mistake we simply add one if missing (true)
// or remove all if false
expected = expected ? '>=1' : 0;
}
if (expected < 0) {
// noop
return expected;
} else if (typeof expected === 'number') {
return String(expected);
} else {
return expected;
}
}
function limitInBetween(location, start, end, expected, isEof) {
var n = getDiff(start, end, expected);
debugBetween('diff: %d', n);
if (n) {
_tk.removeInBetween(start, end, 'WhiteSpace');
}
if (n < 0) {
_tk.removeInBetween(start, end, function(token) {
return token.type === 'LineBreak' && n++ < 0 &&
(isEof || !siblingIsComment(token));
});
} else if (n > 0) {
var target = location === 'after' ? start : end;
var insertNextTo = _tk[location];
while (n-- > 0) {
insertNextTo(target, {
type: 'LineBreak',
value: _curOpts.value
});
}
}
}
function siblingIsComment(token) {
return _tk.isComment(_tk.findPrev(token, _tk.isNotEmpty)) ||
_tk.isComment(_tk.findNext(token, _tk.isNotEmpty));
}
function getDiff(start, end, expected) {
// start will only be equal to end if it's start or file
if (start === end) return 0;
var count = countBrInBetween(start, end);
// yeah, it's ugly to strings to compare integers but was quickest solution
var vCount = String(count) + '.0.0';
if (semver.satisfies(vCount, expected)) {
return 0;
} else {
return getSatisfyingMatch(count, vCount, expected) - count;
}
}
function getSatisfyingMatch(count, vCount, expected) {
var result;
var diff = semver.gtr(vCount, expected) ? -1 : 1;
count += diff;
while (result == null && count >= 0 && count < 100) {
if (semver.satisfies(String(count) + '.0.0', expected)) {
result = count;
}
count += diff;
}
return parseInt(result, 10);
}
function countBrInBetween(start, end) {
var count = 0;
_tk.eachInBetween(start, end, function(token) {
if (_tk.isBr(token)) count++;
});
return count;
}
function getEndToken(token) {
var end = _tk.findNextNonEmpty(token);
if (shouldSkipToken(end)) {
end = _tk.findNextNonEmpty(end);
}
return end ? end : token.root.endToken;
}
function shouldSkipToken(token) {
// if comment is at same line we skip it unless it has a specific rule that
// would add line breaks
var result = _tk.isComment(token) && !isOnSeparateLine(token);
return result && getExpect('before', token.type) <= 0;
}
function isOnSeparateLine(token) {
return _tk.isBr(token.prev) || (
_tk.isEmpty(token.prev) && _tk.isBr(token.prev.prev)
);
}
function getStartToken(token) {
var end = _tk.findPrevNonEmpty(token);
return end ? end : token.root.startToken;
}
exports.limitBeforeEndOfFile = function(ast, amount) {
var typeOrValue = amount != null ? amount : 'EndOfFile';
var expected = getExpect('before', typeOrValue);
if (expected < 0) return; // noop
var lastNonEmpty = _tk.isEmpty(ast.endToken) ?
_tk.findPrevNonEmpty(ast.endToken) :
ast.endToken;
if (lastNonEmpty) {
limitInBetween('after', lastNonEmpty, null, expected, true);
} else {
do {
var br = {
type: 'LineBreak',
value: _curOpts.value
};
if (ast.startToken) {
_tk.after(ast.startToken, br);
} else {
ast.startToken = ast.endToken = br;
}
} while (--expected);
}
};