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eca4bf9 Initial json module. Add production files and pom.
Joni Freeman authored
1 package net.liftweb.json
2
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3 /*
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4 * Copyright 2009-2010 WorldWide Conferencing, LLC
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5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions
16 * and limitations under the License.
17 */
18
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19 object JsonAST {
20 import scala.text.Document
21 import scala.text.Document._
22
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23 /** Concatenates a sequence of <code>JValue</code>s.
24 * <p>
25 * Example:<pre>
26 * concat(JInt(1), JInt(2)) == JArray(List(JInt(1), JInt(2)))
27 * </pre>
28 */
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29 def concat(xs: JValue*) = xs.foldLeft(JNothing: JValue)(_ ++ _)
30
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31 /**
32 * Data type for Json AST.
33 */
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34 sealed abstract class JValue extends Merge.Mergeable with Diff.Diffable {
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35 type Values
36
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37 /** XPath-like expression to query JSON fields by name. Matches only fields on
38 * next level.
39 * <p>
40 * Example:<pre>
41 * json \ "name"
42 * </pre>
43 */
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44 def \(nameToFind: String): JValue = {
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45 val p = (json: JValue) => json match {
46 case JField(name, value) if name == nameToFind => true
47 case _ => false
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48 }
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49 findDirect(children, p) match {
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50 case Nil => JNothing
51 case x :: Nil => x
52 case x => JArray(x)
53 }
54 }
55
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56 private def findDirect(xs: List[JValue], p: JValue => Boolean): List[JValue] = xs.flatMap {
57 case JObject(l) => l.filter {
58 case x if p(x) => true
59 case _ => false
60 }
61 case JArray(l) => findDirect(l, p)
62 case x if p(x) => x :: Nil
63 case _ => Nil
64 }
65
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66 /** XPath-like expression to query JSON fields by name. Returns all matching fields.
67 * <p>
68 * Example:<pre>
69 * json \\ "name"
70 * </pre>
71 */
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72 def \\(nameToFind: String): JValue = {
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73 def find(json: JValue): List[JField] = json match {
74 case JObject(l) => l.foldLeft(List[JField]())((a, e) => a ::: find(e))
75 case JArray(l) => l.foldLeft(List[JField]())((a, e) => a ::: find(e))
76 case field @ JField(name, value) if name == nameToFind => field :: find(value)
77 case JField(_, value) => find(value)
78 case _ => Nil
79 }
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80 find(this) match {
81 case x :: Nil => x
82 case x => JObject(x)
83 }
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84 }
85
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86 /** XPath-like expression to query JSON fields by type. Matches only fields on
87 * next level.
88 * <p>
89 * Example:<pre>
90 * json \ classOf[JInt]
91 * </pre>
92 */
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93 def \[A <: JValue](clazz: Class[A]): List[A#Values] =
94 findDirect(children, typePredicate(clazz) _).asInstanceOf[List[A]] map { _.values }
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95
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96 /** XPath-like expression to query JSON fields by type. Returns all matching fields.
97 * <p>
98 * Example:<pre>
99 * json \\ classOf[JInt]
100 * </pre>
101 */
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102 def \\[A <: JValue](clazz: Class[A]): List[A#Values] =
103 (this filter typePredicate(clazz) _).asInstanceOf[List[A]] map { _.values }
104
105 private def typePredicate[A <: JValue](clazz: Class[A])(json: JValue) = json match {
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106 case x if x.getClass == clazz => true
107 case _ => false
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108 }
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109
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110 /** Return nth element from JSON.
111 * Meaningful only to JArray, JObject and JField. Returns JNothing for other types.
112 * <p>
113 * Example:<pre>
114 * JArray(JInt(1) :: JInt(2) :: Nil)(1) == JInt(2)
115 * </pre>
116 */
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117 def apply(i: Int): JValue = JNothing
118
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119 /** Return unboxed values from JSON
120 * <p>
121 * Example:<pre>
122 * JObject(JField("name", JString("joe")) :: Nil).values == Map("name" -> "joe")
123 * </pre>
124 */
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125 def values: Values
126
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127 /** Return direct child elements.
128 * <p>
129 * Example:<pre>
130 * JArray(JInt(1) :: JInt(2) :: Nil).children == List(JInt(1), JInt(2))
131 * </pre>
132 */
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133 def children = this match {
134 case JObject(l) => l
135 case JArray(l) => l
136 case JField(n, v) => List(v)
137 case _ => Nil
138 }
139
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140 /** Return a combined value by folding over JSON by applying a function <code>f</code>
141 * for each element. The initial value is <code>z</code>.
142 */
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143 def fold[A](z: A)(f: (A, JValue) => A): A = {
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144 def rec(acc: A, v: JValue) = {
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145 val newAcc = f(acc, v)
146 v match {
147 case JObject(l) => l.foldLeft(newAcc)((a, e) => e.fold(a)(f))
148 case JArray(l) => l.foldLeft(newAcc)((a, e) => e.fold(a)(f))
149 case JField(_, value) => value.fold(newAcc)(f)
150 case _ => newAcc
151 }
152 }
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153 rec(z, this)
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154 }
155
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156 /** Return a new JValue resulting from applying the given function <code>f</code>
157 * to each element in JSON.
158 * <p>
159 * Example:<pre>
160 * JArray(JInt(1) :: JInt(2) :: Nil) map { case JInt(x) => JInt(x+1); case x => x }
161 * </pre>
162 */
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163 def map(f: JValue => JValue): JValue = {
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164 def rec(v: JValue): JValue = v match {
165 case JObject(l) => f(JObject(l.map(f => rec(f) match {
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166 case x: JField => x
167 case x => JField(f.name, x)
168 })))
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169 case JArray(l) => f(JArray(l.map(rec)))
170 case JField(name, value) => f(JField(name, rec(value)))
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171 case x => f(x)
172 }
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173 rec(this)
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174 }
175
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176 /** Return the first element from JSON which matches the given predicate.
177 * <p>
178 * Example:<pre>
179 * JArray(JInt(1) :: JInt(2) :: Nil) find { _ == JInt(2) } == Some(JInt(2))
180 * </pre>
181 */
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182 def find(p: JValue => Boolean): Option[JValue] = {
183 def find(json: JValue): Option[JValue] = {
184 if (p(json)) return Some(json)
185 json match {
186 case JObject(l) => l.flatMap(find _).firstOption
187 case JArray(l) => l.flatMap(find _).firstOption
188 case JField(_, value) => find(value)
189 case _ => None
190 }
191 }
192 find(this)
193 }
194
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195 /** Return a List of all elements which matches the given predicate.
196 * <p>
197 * Example:<pre>
198 * JArray(JInt(1) :: JInt(2) :: Nil) filter { case JInt(x) => x > 1; case _ => false }
199 * </pre>
200 */
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201 def filter(p: JValue => Boolean): List[JValue] =
202 fold(List[JValue]())((acc, e) => if (p(e)) e :: acc else acc).reverse
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203
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204 /** Concatenate with another JSON.
205 * This is a concatenation monoid: (JValue, ++, JNothing)
206 * <p>
207 * Example:<pre>
208 * JArray(JInt(1) :: JInt(2) :: Nil) ++ JArray(JInt(3) :: Nil) ==
209 * JArray(List(JInt(1), JInt(2), JInt(3)))
210 * </pre>
211 */
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212 def ++(other: JValue) = {
213 def append(value1: JValue, value2: JValue): JValue = (value1, value2) match {
214 case (JNothing, x) => x
215 case (x, JNothing) => x
216 case (JObject(xs), x: JField) => JObject(xs ::: List(x))
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217 case (x: JField, JObject(xs)) => JObject(x :: xs)
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218 case (JArray(xs), JArray(ys)) => JArray(xs ::: ys)
219 case (JArray(xs), v: JValue) => JArray(xs ::: List(v))
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220 case (v: JValue, JArray(xs)) => JArray(v :: xs)
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221 case (f1: JField, f2: JField) => JObject(f1 :: f2 :: Nil)
222 case (JField(n, v1), v2: JValue) => JField(n, append(v1, v2))
223 case (x, y) => JArray(x :: y :: Nil)
224 }
225 append(this, other)
226 }
227
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228 /** Return a JSON where all elements matching the given predicate are removed.
229 * <p>
230 * Example:<pre>
231 * JArray(JInt(1) :: JInt(2) :: JNull :: Nil) remove { _ == JNull }
232 * </pre>
233 */
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234 def remove(p: JValue => Boolean): JValue = this map {
235 case x if p(x) => JNothing
236 case x => x
237 }
238
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239 /** Extract a case class from a JSON.
240 * <p>
241 * Example:<pre>
242 * case class Person(name: String)
243 * JObject(JField("name", JString("joe")) :: Nil).extract[Foo] == Person("joe")
244 * </pre>
245 */
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246 def extract[A](implicit formats: Formats, mf: scala.reflect.Manifest[A]) =
247 Extraction.extract(this)(formats, mf)
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248 }
249
250 case object JNothing extends JValue {
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251 type Values = None.type
252 def values = None
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253 }
254 case object JNull extends JValue {
255 type Values = Null
256 def values = null
257 }
258 case class JString(s: String) extends JValue {
259 type Values = String
260 def values = s
261 }
262 case class JDouble(num: Double) extends JValue {
263 type Values = Double
264 def values = num
265 }
266 case class JInt(num: BigInt) extends JValue {
267 type Values = BigInt
268 def values = num
269 }
270 case class JBool(value: Boolean) extends JValue {
271 type Values = Boolean
272 def values = value
273 }
274 case class JField(name: String, value: JValue) extends JValue {
275 type Values = (String, value.Values)
276 def values = (name, value.values)
277 override def apply(i: Int): JValue = value(i)
278 }
279 case class JObject(obj: List[JField]) extends JValue {
280 type Values = Map[String, Any]
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281 def values = Map() ++ obj.map(_.values : (String, Any))
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282 }
283 case class JArray(arr: List[JValue]) extends JValue {
284 type Values = List[Any]
285 def values = arr.map(_.values)
286 override def apply(i: Int): JValue = arr(i)
287 }
288
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289 /** Renders JSON.
290 * @see Printer#compact
291 * @see Printer#pretty
292 */
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293 def render(value: JValue): Document = value match {
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294 case null => text("null")
295 case JBool(true) => text("true")
296 case JBool(false) => text("false")
297 case JDouble(n) => text(n.toString)
298 case JInt(n) => text(n.toString)
299 case JNull => text("null")
300 case JNothing => error("can't render 'nothing'")
301 case JString(null) => text("null")
302 case JString(s) => text("\"" + quote(s) + "\"")
303 case JArray(arr) => text("[") :: series(trimArr(arr).map(render(_))) :: text("]")
304 case JField(n, v) => text("\"" + n + "\":") :: render(v)
305 case JObject(obj) =>
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306 val nested = break :: fields(trimObj(obj).map(f => text("\"" + f.name + "\":") :: render(f.value)))
307 text("{") :: nest(2, nested) :: break :: text("}")
308 }
309
310 private def trimArr(xs: List[JValue]) = xs.filter(_ != JNothing)
311 private def trimObj(xs: List[JField]) = xs.filter(_.value != JNothing)
312 private def fold(docs: List[Document]) = docs.foldLeft[Document](empty)(_ :: _)
313 private def series(docs: List[Document]) = fold(punctuate(text(","), docs))
314 private def fields(docs: List[Document]) = fold(punctuate(text(",") :: break, docs))
315 private def punctuate(p: Document, docs: List[Document]): List[Document] = docs match {
316 case Nil => Nil
317 case List(d) => List(d)
318 case d :: ds => (d :: p) :: punctuate(p, ds)
319 }
320
321 private def quote(s: String) = (s.map {
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322 case '"' => "\\\""
323 case '\\' => "\\\\"
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324 case '\b' => "\\b"
325 case '\f' => "\\f"
326 case '\n' => "\\n"
327 case '\r' => "\\r"
328 case '\t' => "\\t"
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329 case c if ((c >= '\u0000' && c < '\u001f') || (c >= '\u0080' && c < '\u00a0') || (c >= '\u2000' && c < '\u2100')) => "\\u%04x".format(c: Int)
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330 case c => c
331 }).mkString
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332 }
333
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334 /** Basic implicit conversions from primitive types into JSON.
335 * Example:<pre>
336 * import net.liftweb.json.Implicits._
337 * JObject(JField("name", "joe") :: Nil) == JObject(JField("name", JString("joe")) :: Nil)
338 * </pre>
339 */
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340 object Implicits extends Implicits
341 trait Implicits {
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342 import JsonAST._
343
344 implicit def int2jvalue(x: Int) = JInt(x)
345 implicit def long2jvalue(x: Long) = JInt(x)
346 implicit def bigint2jvalue(x: BigInt) = JInt(x)
347 implicit def double2jvalue(x: Double) = JDouble(x)
348 implicit def bigdecimal2jvalue(x: BigDecimal) = JDouble(x.doubleValue)
349 implicit def boolean2jvalue(x: Boolean) = JBool(x)
350 implicit def string2jvalue(x: String) = JString(x)
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351 }
352
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353 /** A DSL to produce valid JSON.
354 * Example:<pre>
355 * import net.liftweb.json.JsonDSL._
356 * ("name", "joe") ~ ("age", 15) == JObject(JField("name",JString("joe")) :: JField("age",JInt(15)) :: Nil)
357 * </pre>
358 */
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359 object JsonDSL extends Implicits with Printer {
360 import JsonAST._
361
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362 implicit def seq2jvalue[A <% JValue](s: Seq[A]) = JArray(s.toList.map { a => val v: JValue = a; v })
363 implicit def option2jvalue[A <% JValue](opt: Option[A]): JValue = opt match {
364 case Some(x) => x
365 case None => JNothing
366 }
367
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368 implicit def symbol2jvalue(x: Symbol) = JString(x.name)
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369 implicit def pair2jvalue[A <% JValue](t: (String, A)) = JObject(List(JField(t._1, t._2)))
370 implicit def list2jvalue(l: List[JField]) = JObject(l)
371 implicit def jobject2assoc(o: JObject) = new JsonListAssoc(o.obj)
372 implicit def pair2Assoc[A <% JValue](t: (String, A)) = new JsonAssoc(t)
373
374 class JsonAssoc[A <% JValue](left: (String, A)) {
375 def ~[B <% JValue](right: (String, B)) = {
376 val l: JValue = left._2
377 val r: JValue = right._2
378 JObject(JField(left._1, l) :: JField(right._1, r) :: Nil)
379 }
380
381 def ~(right: JObject) = {
382 val l: JValue = left._2
383 JObject(JField(left._1, l) :: right.obj)
384 }
385 }
386
387 class JsonListAssoc(left: List[JField]) {
388 def ~(right: (String, JValue)) = JObject(left ::: List(JField(right._1, right._2)))
389 def ~(right: JObject) = JObject(left ::: right.obj)
390 }
391 }
392
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393 /** Printer converts JSON to String.
394 * Before printing a <code>JValue</code> needs to be rendered into scala.text.Document.
395 * <p>
396 * Example:<pre>
397 * pretty(render(json))
398 * </pre>
399 *
400 * @see net.liftweb.json.JsonAST#render
401 */
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402 object Printer extends Printer
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403 trait Printer {
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404 import java.io._
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405 import scala.text._
406
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407 /** Compact printing (no whitespace etc.)
408 */
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409 def compact(d: Document): String = compact(d, new StringWriter).toString
410
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411 /** Compact printing (no whitespace etc.)
412 */
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413 def compact[A <: Writer](d: Document, out: A): A = {
414 def layout(doc: Document): Unit = doc match {
415 case DocText(s) => out.write(s)
416 case DocCons(d1, d2) => layout(d1); layout(d2)
417 case DocBreak =>
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418 case DocNest(_, d) => layout(d)
419 case DocGroup(d) => layout(d)
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420 case DocNil =>
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421 }
422 layout(d)
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423 out.flush
424 out
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425 }
426
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427 /** Pretty printing.
428 */
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429 def pretty(d: Document): String = pretty(d, new StringWriter).toString
430
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431 /** Pretty printing.
432 */
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433 def pretty[A <: Writer](d: Document, out: A): A = {
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434 d.format(0, out)
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435 out
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436 }
437 }
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