-
Notifications
You must be signed in to change notification settings - Fork 1.3k
/
ManifestRewriter.swift
438 lines (349 loc) · 15.6 KB
/
ManifestRewriter.swift
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
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
/*
This source file is part of the Swift.org open source project
Copyright (c) 2019 Apple Inc. and the Swift project authors
Licensed under Apache License v2.0 with Runtime Library Exception
See http://swift.org/LICENSE.txt for license information
See http://swift.org/CONTRIBUTORS.txt for Swift project authors
*/
import SwiftSyntax
/// A package manifest rewriter.
///
/// This class provides functionality for rewriting the
/// Swift package manifest using the SwiftSyntax library.
///
/// Similar to SwiftSyntax, this class only deals with the
/// syntax and has no functionality for semantics of the manifest.
public final class ManifestRewriter {
enum Error: Swift.Error {
case error(String)
}
/// The contents of the original manifest.
public let originalManifest: String
/// The contents of the edited manifest.
public var editedManifest: String {
return editedSource.description
}
/// The edited manifest syntax.
private var editedSource: Syntax
/// Create a new manfiest editor with the given contents.
public init(_ manifest: String) throws {
self.originalManifest = manifest
self.editedSource = Syntax(try SyntaxParser.parse(source: manifest))
}
/// Add a package dependency.
public func addPackageDependency(
url: String,
requirement: PackageDependencyRequirement
) throws {
// Find Package initializer.
let packageFinder = PackageInitFinder()
packageFinder.walk(editedSource)
guard let initFnExpr = packageFinder.packageInit else {
throw Error.error("Couldn't find Package initializer")
}
// Find dependencies section in the argument list of Package(...).
let packageDependenciesFinder = DependenciesArrayFinder()
packageDependenciesFinder.walk(initFnExpr.argumentList)
let packageDependencies: ArrayExprSyntax
if let existingPackageDependencies = packageDependenciesFinder.dependenciesArrayExpr {
packageDependencies = existingPackageDependencies
} else {
// We didn't find a dependencies section so insert one.
let argListWithDependencies = DependenciesArrayWriter().visit(initFnExpr.argumentList)
// Find the inserted section.
let packageDependenciesFinder = DependenciesArrayFinder()
packageDependenciesFinder.walk(argListWithDependencies)
packageDependencies = packageDependenciesFinder.dependenciesArrayExpr!
}
// Add the the package dependency entry.
let newManifest = PackageDependencyWriter(
url: url,
requirement: requirement
).visit(packageDependencies).root
self.editedSource = newManifest
}
/// Add a target dependency.
public func addTargetDependency(
target: String,
dependency: String
) throws {
// Find Package initializer.
let packageFinder = PackageInitFinder()
packageFinder.walk(editedSource)
guard let initFnExpr = packageFinder.packageInit else {
throw Error.error("Couldn't find Package initializer")
}
// Find the `targets: []` array.
let targetsArrayFinder = TargetsArrayFinder()
targetsArrayFinder.walk(initFnExpr.argumentList)
guard let targetsArrayExpr = targetsArrayFinder.targets else {
throw Error.error("Couldn't find targets label")
}
// Find the target node.
let targetFinder = TargetFinder(name: target)
targetFinder.walk(targetsArrayExpr)
guard let targetNode = targetFinder.foundTarget else {
throw Error.error("Couldn't find target \(target)")
}
let targetDependencyFinder = DependenciesArrayFinder()
targetDependencyFinder.walk(targetNode)
guard let targetDependencies = targetDependencyFinder.dependenciesArrayExpr else {
throw Error.error("Couldn't find dependencies section")
}
// Add the target dependency entry.
let newManifest = TargetDependencyWriter(
dependencyName: dependency
).visit(targetDependencies).root
self.editedSource = newManifest
}
/// Add a new target.
public func addTarget(
targetName: String,
type: TargetType = .regular
) throws {
// Find Package initializer.
let packageFinder = PackageInitFinder()
packageFinder.walk(editedSource)
guard let initFnExpr = packageFinder.packageInit else {
throw Error.error("Couldn't find Package initializer")
}
let targetsFinder = TargetsArrayFinder()
targetsFinder.walk(initFnExpr.argumentList)
guard let targetsNode = targetsFinder.targets else {
throw Error.error("Couldn't find targets section")
}
let newManifest = NewTargetWriter(
name: targetName, targetType: type
).visit(targetsNode).root
self.editedSource = newManifest
}
}
// MARK: - Syntax Visitors
/// Package init finder.
final class PackageInitFinder: SyntaxVisitor {
/// Reference to the function call of the package initializer.
private(set) var packageInit: FunctionCallExprSyntax?
override func visit(_ node: InitializerClauseSyntax) -> SyntaxVisitorContinueKind {
if let fnCall = FunctionCallExprSyntax(Syntax(node.value)),
let identifier = fnCall.calledExpression.firstToken,
identifier.text == "Package" {
assert(packageInit == nil, "Found two package initializers")
packageInit = fnCall
}
return .skipChildren
}
}
/// Finder for "dependencies" array syntax.
final class DependenciesArrayFinder: SyntaxVisitor {
private(set) var dependenciesArrayExpr: ArrayExprSyntax?
override func visit(_ node: TupleExprElementSyntax) -> SyntaxVisitorContinueKind {
guard node.label?.text == "dependencies" else {
return .skipChildren
}
// We have custom code like foo + bar + [] (hopefully there is an array expr here).
if let seq = node.expression.as(SequenceExprSyntax.self) {
dependenciesArrayExpr = seq.elements.first(where: { $0.is(ArrayExprSyntax.self) })?.as(ArrayExprSyntax.self)
} else if let arrayExpr = node.expression.as(ArrayExprSyntax.self) {
dependenciesArrayExpr = arrayExpr
}
// FIXME: If we find a dependencies section but not an array expr, then we should
// not try to insert one later. i.e. return error if depsArray is nil.
return .skipChildren
}
}
/// Finder for targets array expression.
final class TargetsArrayFinder: SyntaxVisitor {
/// The found targets array expr.
private(set) var targets: ArrayExprSyntax?
override func visit(_ node: TupleExprElementSyntax) -> SyntaxVisitorContinueKind {
if node.label?.text == "targets",
let expr = node.expression.as(ArrayExprSyntax.self) {
assert(targets == nil, "Found two targets labels")
targets = expr
}
return .skipChildren
}
}
/// Finds a given target in a list of targets.
final class TargetFinder: SyntaxVisitor {
let targetToFind: String
private(set) var foundTarget: TupleExprElementListSyntax?
init(name: String) {
self.targetToFind = name
}
override func visit(_ node: TupleExprElementSyntax) -> SyntaxVisitorContinueKind {
guard case .identifier(let label)? = node.label?.tokenKind else {
return .skipChildren
}
guard label == "name", let targetNameExpr = node.expression.as(StringLiteralExprSyntax.self),
targetNameExpr.segments.count == 1, let segment = targetNameExpr.segments.first?.as(StringSegmentSyntax.self) else {
return .skipChildren
}
guard case .stringSegment(let targetName) = segment.content.tokenKind else {
return .skipChildren
}
if targetName == self.targetToFind {
self.foundTarget = node.parent?.as(TupleExprElementListSyntax.self)
return .skipChildren
}
return .skipChildren
}
}
// MARK: - Syntax Rewriters
/// Writer for "dependencies" array syntax.
final class DependenciesArrayWriter: SyntaxRewriter {
override func visit(_ node: TupleExprElementListSyntax) -> Syntax {
let leadingTrivia = node.firstToken?.leadingTrivia ?? .zero
let dependenciesArg = SyntaxFactory.makeTupleExprElement(
label: SyntaxFactory.makeIdentifier("dependencies", leadingTrivia: leadingTrivia),
colon: SyntaxFactory.makeColonToken(trailingTrivia: .spaces(1)),
expression: ExprSyntax(SyntaxFactory.makeArrayExpr(
leftSquare: SyntaxFactory.makeLeftSquareBracketToken(),
elements: SyntaxFactory.makeBlankArrayElementList(),
rightSquare: SyntaxFactory.makeRightSquareBracketToken())),
trailingComma: SyntaxFactory.makeCommaToken()
)
// FIXME: This is not correct, we need to find the
// proper position for inserting `dependencies: []`.
return Syntax(node.inserting(dependenciesArg, at: 1))
}
}
/// Writer for inserting a trailing comma in an array expr.
final class ArrayTrailingCommaWriter: SyntaxRewriter {
let lastElement: ArrayElementSyntax
init(lastElement: ArrayElementSyntax) {
self.lastElement = lastElement
}
override func visit(_ node: ArrayElementSyntax) -> Syntax {
guard lastElement == node else {
return Syntax(node)
}
return Syntax(node.withTrailingComma(SyntaxFactory.makeCommaToken(trailingTrivia: .spaces(1))))
}
}
/// Package dependency writer.
final class PackageDependencyWriter: SyntaxRewriter {
/// The dependency url to write.
let url: String
/// The dependency requirement.
let requirement: PackageDependencyRequirement
init(url: String, requirement: PackageDependencyRequirement) {
self.url = url
self.requirement = requirement
}
override func visit(_ node: ArrayExprSyntax) -> ExprSyntax {
// FIXME: We should get the trivia from the closing brace.
let leadingTrivia: Trivia = [.newlines(1), .spaces(8)]
let dotPackageExpr = SyntaxFactory.makeMemberAccessExpr(
base: nil,
dot: SyntaxFactory.makePeriodToken(leadingTrivia: leadingTrivia),
name: SyntaxFactory.makeIdentifier("package"),
declNameArguments: nil
)
var args: [TupleExprElementSyntax] = []
let firstArgLabel = requirement == .localPackage ? "path" : "url"
let url = SyntaxFactory.makeTupleExprElement(
label: SyntaxFactory.makeIdentifier(firstArgLabel),
colon: SyntaxFactory.makeColonToken(trailingTrivia: .spaces(1)),
expression: ExprSyntax(SyntaxFactory.makeStringLiteralExpr(self.url)),
trailingComma: requirement == .localPackage ? nil : SyntaxFactory.makeCommaToken(trailingTrivia: .spaces(1))
)
args.append(url)
// FIXME: Handle other types of requirements.
if requirement != .localPackage {
let secondArg = SyntaxFactory.makeTupleExprElement(
label: SyntaxFactory.makeIdentifier("from"),
colon: SyntaxFactory.makeColonToken(trailingTrivia: .spaces(1)),
expression: ExprSyntax(SyntaxFactory.makeStringLiteralExpr(requirement.ref!)),
trailingComma: nil
)
args.append(secondArg)
}
let expr = SyntaxFactory.makeFunctionCallExpr(
calledExpression: ExprSyntax(dotPackageExpr),
leftParen: SyntaxFactory.makeLeftParenToken(),
argumentList: SyntaxFactory.makeTupleExprElementList(args),
rightParen: SyntaxFactory.makeRightParenToken(),
trailingClosure: nil,
additionalTrailingClosures: nil
)
let newDependencyElement = SyntaxFactory.makeArrayElement(
expression: ExprSyntax(expr),
trailingComma: SyntaxFactory.makeCommaToken()
)
let rightBrace = SyntaxFactory.makeRightSquareBracketToken(
leadingTrivia: [.newlines(1), .spaces(4)])
return ExprSyntax(node.addElement(newDependencyElement)
.withRightSquare(rightBrace))
}
}
/// Writer for inserting a target dependency.
final class TargetDependencyWriter: SyntaxRewriter {
/// The name of the dependency to write.
let dependencyName: String
init(dependencyName name: String) {
self.dependencyName = name
}
override func visit(_ node: ArrayExprSyntax) -> ExprSyntax {
var node = node
// Insert trailing comma, if needed.
if node.elements.count > 0 {
let lastElement = node.elements.map{$0}.last!
let trailingTriviaWriter = ArrayTrailingCommaWriter(lastElement: lastElement)
let newElements = trailingTriviaWriter.visit(node.elements)
node = node.withElements((newElements.as(ArrayElementListSyntax.self)!))
}
let newDependencyElement = SyntaxFactory.makeArrayElement(
expression: ExprSyntax(SyntaxFactory.makeStringLiteralExpr(self.dependencyName)),
trailingComma: nil
)
return ExprSyntax(node.addElement(newDependencyElement))
}
}
/// Writer for inserting a new target in a targets array.
final class NewTargetWriter: SyntaxRewriter {
let name: String
let targetType: TargetType
init(name: String, targetType: TargetType) {
self.name = name
self.targetType = targetType
}
override func visit(_ node: ArrayExprSyntax) -> ExprSyntax {
let leadingTrivia: Trivia = [.newlines(1), .spaces(8)]
let leadingTriviaArgs: Trivia = leadingTrivia.appending(.spaces(4))
let dotPackageExpr = SyntaxFactory.makeMemberAccessExpr(
base: nil,
dot: SyntaxFactory.makePeriodToken(leadingTrivia: leadingTrivia),
name: SyntaxFactory.makeIdentifier(targetType.factoryMethodName),
declNameArguments: nil
)
let nameArg = SyntaxFactory.makeTupleExprElement(
label: SyntaxFactory.makeIdentifier("name", leadingTrivia: leadingTriviaArgs),
colon: SyntaxFactory.makeColonToken(trailingTrivia: .spaces(1)),
expression: ExprSyntax(SyntaxFactory.makeStringLiteralExpr(self.name)),
trailingComma: SyntaxFactory.makeCommaToken()
)
let emptyArray = SyntaxFactory.makeArrayExpr(leftSquare: SyntaxFactory.makeLeftSquareBracketToken(), elements: SyntaxFactory.makeBlankArrayElementList(), rightSquare: SyntaxFactory.makeRightSquareBracketToken())
let depenenciesArg = SyntaxFactory.makeTupleExprElement(
label: SyntaxFactory.makeIdentifier("dependencies", leadingTrivia: leadingTriviaArgs),
colon: SyntaxFactory.makeColonToken(trailingTrivia: .spaces(1)),
expression: ExprSyntax(emptyArray),
trailingComma: nil
)
let expr = SyntaxFactory.makeFunctionCallExpr(
calledExpression: ExprSyntax(dotPackageExpr),
leftParen: SyntaxFactory.makeLeftParenToken(),
argumentList: SyntaxFactory.makeTupleExprElementList([
nameArg, depenenciesArg,
]),
rightParen: SyntaxFactory.makeRightParenToken(),
trailingClosure: nil,
additionalTrailingClosures: nil
)
let newDependencyElement = SyntaxFactory.makeArrayElement(
expression: ExprSyntax(expr),
trailingComma: SyntaxFactory.makeCommaToken()
)
return ExprSyntax(node.addElement(newDependencyElement))
}
}