Don Newton | 379ae25 | 2019-04-01 12:17:06 -0400 | [diff] [blame^] | 1 | // Copyright (C) MongoDB, Inc. 2017-present. |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); you may |
| 4 | // not use this file except in compliance with the License. You may obtain |
| 5 | // a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 |
| 6 | |
| 7 | package bsonrw |
| 8 | |
| 9 | import ( |
| 10 | "bytes" |
| 11 | "encoding/base64" |
| 12 | "fmt" |
| 13 | "github.com/mongodb/mongo-go-driver/bson/primitive" |
| 14 | "io" |
| 15 | "math" |
| 16 | "sort" |
| 17 | "strconv" |
| 18 | "strings" |
| 19 | "sync" |
| 20 | "time" |
| 21 | "unicode/utf8" |
| 22 | ) |
| 23 | |
| 24 | var ejvwPool = sync.Pool{ |
| 25 | New: func() interface{} { |
| 26 | return new(extJSONValueWriter) |
| 27 | }, |
| 28 | } |
| 29 | |
| 30 | // ExtJSONValueWriterPool is a pool for ExtJSON ValueWriters. |
| 31 | type ExtJSONValueWriterPool struct { |
| 32 | pool sync.Pool |
| 33 | } |
| 34 | |
| 35 | // NewExtJSONValueWriterPool creates a new pool for ValueWriter instances that write to ExtJSON. |
| 36 | func NewExtJSONValueWriterPool() *ExtJSONValueWriterPool { |
| 37 | return &ExtJSONValueWriterPool{ |
| 38 | pool: sync.Pool{ |
| 39 | New: func() interface{} { |
| 40 | return new(extJSONValueWriter) |
| 41 | }, |
| 42 | }, |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | // Get retrieves a ExtJSON ValueWriter from the pool and resets it to use w as the destination. |
| 47 | func (bvwp *ExtJSONValueWriterPool) Get(w io.Writer, canonical, escapeHTML bool) ValueWriter { |
| 48 | vw := bvwp.pool.Get().(*extJSONValueWriter) |
| 49 | if writer, ok := w.(*SliceWriter); ok { |
| 50 | vw.reset(*writer, canonical, escapeHTML) |
| 51 | vw.w = writer |
| 52 | return vw |
| 53 | } |
| 54 | vw.buf = vw.buf[:0] |
| 55 | vw.w = w |
| 56 | return vw |
| 57 | } |
| 58 | |
| 59 | // Put inserts a ValueWriter into the pool. If the ValueWriter is not a ExtJSON ValueWriter, nothing |
| 60 | // happens and ok will be false. |
| 61 | func (bvwp *ExtJSONValueWriterPool) Put(vw ValueWriter) (ok bool) { |
| 62 | bvw, ok := vw.(*extJSONValueWriter) |
| 63 | if !ok { |
| 64 | return false |
| 65 | } |
| 66 | |
| 67 | if _, ok := bvw.w.(*SliceWriter); ok { |
| 68 | bvw.buf = nil |
| 69 | } |
| 70 | bvw.w = nil |
| 71 | |
| 72 | bvwp.pool.Put(bvw) |
| 73 | return true |
| 74 | } |
| 75 | |
| 76 | type ejvwState struct { |
| 77 | mode mode |
| 78 | } |
| 79 | |
| 80 | type extJSONValueWriter struct { |
| 81 | w io.Writer |
| 82 | buf []byte |
| 83 | |
| 84 | stack []ejvwState |
| 85 | frame int64 |
| 86 | canonical bool |
| 87 | escapeHTML bool |
| 88 | } |
| 89 | |
| 90 | // NewExtJSONValueWriter creates a ValueWriter that writes Extended JSON to w. |
| 91 | func NewExtJSONValueWriter(w io.Writer, canonical, escapeHTML bool) (ValueWriter, error) { |
| 92 | if w == nil { |
| 93 | return nil, errNilWriter |
| 94 | } |
| 95 | |
| 96 | return newExtJSONWriter(w, canonical, escapeHTML), nil |
| 97 | } |
| 98 | |
| 99 | func newExtJSONWriter(w io.Writer, canonical, escapeHTML bool) *extJSONValueWriter { |
| 100 | stack := make([]ejvwState, 1, 5) |
| 101 | stack[0] = ejvwState{mode: mTopLevel} |
| 102 | |
| 103 | return &extJSONValueWriter{ |
| 104 | w: w, |
| 105 | buf: []byte{}, |
| 106 | stack: stack, |
| 107 | canonical: canonical, |
| 108 | escapeHTML: escapeHTML, |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | func newExtJSONWriterFromSlice(buf []byte, canonical, escapeHTML bool) *extJSONValueWriter { |
| 113 | stack := make([]ejvwState, 1, 5) |
| 114 | stack[0] = ejvwState{mode: mTopLevel} |
| 115 | |
| 116 | return &extJSONValueWriter{ |
| 117 | buf: buf, |
| 118 | stack: stack, |
| 119 | canonical: canonical, |
| 120 | escapeHTML: escapeHTML, |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | func (ejvw *extJSONValueWriter) reset(buf []byte, canonical, escapeHTML bool) { |
| 125 | if ejvw.stack == nil { |
| 126 | ejvw.stack = make([]ejvwState, 1, 5) |
| 127 | } |
| 128 | |
| 129 | ejvw.stack = ejvw.stack[:1] |
| 130 | ejvw.stack[0] = ejvwState{mode: mTopLevel} |
| 131 | ejvw.canonical = canonical |
| 132 | ejvw.escapeHTML = escapeHTML |
| 133 | ejvw.frame = 0 |
| 134 | ejvw.buf = buf |
| 135 | ejvw.w = nil |
| 136 | } |
| 137 | |
| 138 | func (ejvw *extJSONValueWriter) advanceFrame() { |
| 139 | if ejvw.frame+1 >= int64(len(ejvw.stack)) { // We need to grow the stack |
| 140 | length := len(ejvw.stack) |
| 141 | if length+1 >= cap(ejvw.stack) { |
| 142 | // double it |
| 143 | buf := make([]ejvwState, 2*cap(ejvw.stack)+1) |
| 144 | copy(buf, ejvw.stack) |
| 145 | ejvw.stack = buf |
| 146 | } |
| 147 | ejvw.stack = ejvw.stack[:length+1] |
| 148 | } |
| 149 | ejvw.frame++ |
| 150 | } |
| 151 | |
| 152 | func (ejvw *extJSONValueWriter) push(m mode) { |
| 153 | ejvw.advanceFrame() |
| 154 | |
| 155 | ejvw.stack[ejvw.frame].mode = m |
| 156 | } |
| 157 | |
| 158 | func (ejvw *extJSONValueWriter) pop() { |
| 159 | switch ejvw.stack[ejvw.frame].mode { |
| 160 | case mElement, mValue: |
| 161 | ejvw.frame-- |
| 162 | case mDocument, mArray, mCodeWithScope: |
| 163 | ejvw.frame -= 2 // we pop twice to jump over the mElement: mDocument -> mElement -> mDocument/mTopLevel/etc... |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | func (ejvw *extJSONValueWriter) invalidTransitionErr(destination mode, name string, modes []mode) error { |
| 168 | te := TransitionError{ |
| 169 | name: name, |
| 170 | current: ejvw.stack[ejvw.frame].mode, |
| 171 | destination: destination, |
| 172 | modes: modes, |
| 173 | action: "write", |
| 174 | } |
| 175 | if ejvw.frame != 0 { |
| 176 | te.parent = ejvw.stack[ejvw.frame-1].mode |
| 177 | } |
| 178 | return te |
| 179 | } |
| 180 | |
| 181 | func (ejvw *extJSONValueWriter) ensureElementValue(destination mode, callerName string, addmodes ...mode) error { |
| 182 | switch ejvw.stack[ejvw.frame].mode { |
| 183 | case mElement, mValue: |
| 184 | default: |
| 185 | modes := []mode{mElement, mValue} |
| 186 | if addmodes != nil { |
| 187 | modes = append(modes, addmodes...) |
| 188 | } |
| 189 | return ejvw.invalidTransitionErr(destination, callerName, modes) |
| 190 | } |
| 191 | |
| 192 | return nil |
| 193 | } |
| 194 | |
| 195 | func (ejvw *extJSONValueWriter) writeExtendedSingleValue(key string, value string, quotes bool) { |
| 196 | var s string |
| 197 | if quotes { |
| 198 | s = fmt.Sprintf(`{"$%s":"%s"}`, key, value) |
| 199 | } else { |
| 200 | s = fmt.Sprintf(`{"$%s":%s}`, key, value) |
| 201 | } |
| 202 | |
| 203 | ejvw.buf = append(ejvw.buf, []byte(s)...) |
| 204 | } |
| 205 | |
| 206 | func (ejvw *extJSONValueWriter) WriteArray() (ArrayWriter, error) { |
| 207 | if err := ejvw.ensureElementValue(mArray, "WriteArray"); err != nil { |
| 208 | return nil, err |
| 209 | } |
| 210 | |
| 211 | ejvw.buf = append(ejvw.buf, '[') |
| 212 | |
| 213 | ejvw.push(mArray) |
| 214 | return ejvw, nil |
| 215 | } |
| 216 | |
| 217 | func (ejvw *extJSONValueWriter) WriteBinary(b []byte) error { |
| 218 | return ejvw.WriteBinaryWithSubtype(b, 0x00) |
| 219 | } |
| 220 | |
| 221 | func (ejvw *extJSONValueWriter) WriteBinaryWithSubtype(b []byte, btype byte) error { |
| 222 | if err := ejvw.ensureElementValue(mode(0), "WriteBinaryWithSubtype"); err != nil { |
| 223 | return err |
| 224 | } |
| 225 | |
| 226 | var buf bytes.Buffer |
| 227 | buf.WriteString(`{"$binary":{"base64":"`) |
| 228 | buf.WriteString(base64.StdEncoding.EncodeToString(b)) |
| 229 | buf.WriteString(fmt.Sprintf(`","subType":"%02x"}},`, btype)) |
| 230 | |
| 231 | ejvw.buf = append(ejvw.buf, buf.Bytes()...) |
| 232 | |
| 233 | ejvw.pop() |
| 234 | return nil |
| 235 | } |
| 236 | |
| 237 | func (ejvw *extJSONValueWriter) WriteBoolean(b bool) error { |
| 238 | if err := ejvw.ensureElementValue(mode(0), "WriteBoolean"); err != nil { |
| 239 | return err |
| 240 | } |
| 241 | |
| 242 | ejvw.buf = append(ejvw.buf, []byte(strconv.FormatBool(b))...) |
| 243 | ejvw.buf = append(ejvw.buf, ',') |
| 244 | |
| 245 | ejvw.pop() |
| 246 | return nil |
| 247 | } |
| 248 | |
| 249 | func (ejvw *extJSONValueWriter) WriteCodeWithScope(code string) (DocumentWriter, error) { |
| 250 | if err := ejvw.ensureElementValue(mCodeWithScope, "WriteCodeWithScope"); err != nil { |
| 251 | return nil, err |
| 252 | } |
| 253 | |
| 254 | var buf bytes.Buffer |
| 255 | buf.WriteString(`{"$code":`) |
| 256 | writeStringWithEscapes(code, &buf, ejvw.escapeHTML) |
| 257 | buf.WriteString(`,"$scope":{`) |
| 258 | |
| 259 | ejvw.buf = append(ejvw.buf, buf.Bytes()...) |
| 260 | |
| 261 | ejvw.push(mCodeWithScope) |
| 262 | return ejvw, nil |
| 263 | } |
| 264 | |
| 265 | func (ejvw *extJSONValueWriter) WriteDBPointer(ns string, oid primitive.ObjectID) error { |
| 266 | if err := ejvw.ensureElementValue(mode(0), "WriteDBPointer"); err != nil { |
| 267 | return err |
| 268 | } |
| 269 | |
| 270 | var buf bytes.Buffer |
| 271 | buf.WriteString(`{"$dbPointer":{"$ref":"`) |
| 272 | buf.WriteString(ns) |
| 273 | buf.WriteString(`","$id":{"$oid":"`) |
| 274 | buf.WriteString(oid.Hex()) |
| 275 | buf.WriteString(`"}}},`) |
| 276 | |
| 277 | ejvw.buf = append(ejvw.buf, buf.Bytes()...) |
| 278 | |
| 279 | ejvw.pop() |
| 280 | return nil |
| 281 | } |
| 282 | |
| 283 | func (ejvw *extJSONValueWriter) WriteDateTime(dt int64) error { |
| 284 | if err := ejvw.ensureElementValue(mode(0), "WriteDateTime"); err != nil { |
| 285 | return err |
| 286 | } |
| 287 | |
| 288 | t := time.Unix(dt/1e3, dt%1e3*1e6).UTC() |
| 289 | |
| 290 | if ejvw.canonical || t.Year() < 1970 || t.Year() > 9999 { |
| 291 | s := fmt.Sprintf(`{"$numberLong":"%d"}`, dt) |
| 292 | ejvw.writeExtendedSingleValue("date", s, false) |
| 293 | } else { |
| 294 | ejvw.writeExtendedSingleValue("date", t.Format(rfc3339Milli), true) |
| 295 | } |
| 296 | |
| 297 | ejvw.buf = append(ejvw.buf, ',') |
| 298 | |
| 299 | ejvw.pop() |
| 300 | return nil |
| 301 | } |
| 302 | |
| 303 | func (ejvw *extJSONValueWriter) WriteDecimal128(d primitive.Decimal128) error { |
| 304 | if err := ejvw.ensureElementValue(mode(0), "WriteDecimal128"); err != nil { |
| 305 | return err |
| 306 | } |
| 307 | |
| 308 | ejvw.writeExtendedSingleValue("numberDecimal", d.String(), true) |
| 309 | ejvw.buf = append(ejvw.buf, ',') |
| 310 | |
| 311 | ejvw.pop() |
| 312 | return nil |
| 313 | } |
| 314 | |
| 315 | func (ejvw *extJSONValueWriter) WriteDocument() (DocumentWriter, error) { |
| 316 | if ejvw.stack[ejvw.frame].mode == mTopLevel { |
| 317 | ejvw.buf = append(ejvw.buf, '{') |
| 318 | return ejvw, nil |
| 319 | } |
| 320 | |
| 321 | if err := ejvw.ensureElementValue(mDocument, "WriteDocument", mTopLevel); err != nil { |
| 322 | return nil, err |
| 323 | } |
| 324 | |
| 325 | ejvw.buf = append(ejvw.buf, '{') |
| 326 | ejvw.push(mDocument) |
| 327 | return ejvw, nil |
| 328 | } |
| 329 | |
| 330 | func (ejvw *extJSONValueWriter) WriteDouble(f float64) error { |
| 331 | if err := ejvw.ensureElementValue(mode(0), "WriteDouble"); err != nil { |
| 332 | return err |
| 333 | } |
| 334 | |
| 335 | s := formatDouble(f) |
| 336 | |
| 337 | if ejvw.canonical { |
| 338 | ejvw.writeExtendedSingleValue("numberDouble", s, true) |
| 339 | } else { |
| 340 | switch s { |
| 341 | case "Infinity": |
| 342 | fallthrough |
| 343 | case "-Infinity": |
| 344 | fallthrough |
| 345 | case "NaN": |
| 346 | s = fmt.Sprintf(`{"$numberDouble":"%s"}`, s) |
| 347 | } |
| 348 | ejvw.buf = append(ejvw.buf, []byte(s)...) |
| 349 | } |
| 350 | |
| 351 | ejvw.buf = append(ejvw.buf, ',') |
| 352 | |
| 353 | ejvw.pop() |
| 354 | return nil |
| 355 | } |
| 356 | |
| 357 | func (ejvw *extJSONValueWriter) WriteInt32(i int32) error { |
| 358 | if err := ejvw.ensureElementValue(mode(0), "WriteInt32"); err != nil { |
| 359 | return err |
| 360 | } |
| 361 | |
| 362 | s := strconv.FormatInt(int64(i), 10) |
| 363 | |
| 364 | if ejvw.canonical { |
| 365 | ejvw.writeExtendedSingleValue("numberInt", s, true) |
| 366 | } else { |
| 367 | ejvw.buf = append(ejvw.buf, []byte(s)...) |
| 368 | } |
| 369 | |
| 370 | ejvw.buf = append(ejvw.buf, ',') |
| 371 | |
| 372 | ejvw.pop() |
| 373 | return nil |
| 374 | } |
| 375 | |
| 376 | func (ejvw *extJSONValueWriter) WriteInt64(i int64) error { |
| 377 | if err := ejvw.ensureElementValue(mode(0), "WriteInt64"); err != nil { |
| 378 | return err |
| 379 | } |
| 380 | |
| 381 | s := strconv.FormatInt(i, 10) |
| 382 | |
| 383 | if ejvw.canonical { |
| 384 | ejvw.writeExtendedSingleValue("numberLong", s, true) |
| 385 | } else { |
| 386 | ejvw.buf = append(ejvw.buf, []byte(s)...) |
| 387 | } |
| 388 | |
| 389 | ejvw.buf = append(ejvw.buf, ',') |
| 390 | |
| 391 | ejvw.pop() |
| 392 | return nil |
| 393 | } |
| 394 | |
| 395 | func (ejvw *extJSONValueWriter) WriteJavascript(code string) error { |
| 396 | if err := ejvw.ensureElementValue(mode(0), "WriteJavascript"); err != nil { |
| 397 | return err |
| 398 | } |
| 399 | |
| 400 | var buf bytes.Buffer |
| 401 | writeStringWithEscapes(code, &buf, ejvw.escapeHTML) |
| 402 | |
| 403 | ejvw.writeExtendedSingleValue("code", buf.String(), false) |
| 404 | ejvw.buf = append(ejvw.buf, ',') |
| 405 | |
| 406 | ejvw.pop() |
| 407 | return nil |
| 408 | } |
| 409 | |
| 410 | func (ejvw *extJSONValueWriter) WriteMaxKey() error { |
| 411 | if err := ejvw.ensureElementValue(mode(0), "WriteMaxKey"); err != nil { |
| 412 | return err |
| 413 | } |
| 414 | |
| 415 | ejvw.writeExtendedSingleValue("maxKey", "1", false) |
| 416 | ejvw.buf = append(ejvw.buf, ',') |
| 417 | |
| 418 | ejvw.pop() |
| 419 | return nil |
| 420 | } |
| 421 | |
| 422 | func (ejvw *extJSONValueWriter) WriteMinKey() error { |
| 423 | if err := ejvw.ensureElementValue(mode(0), "WriteMinKey"); err != nil { |
| 424 | return err |
| 425 | } |
| 426 | |
| 427 | ejvw.writeExtendedSingleValue("minKey", "1", false) |
| 428 | ejvw.buf = append(ejvw.buf, ',') |
| 429 | |
| 430 | ejvw.pop() |
| 431 | return nil |
| 432 | } |
| 433 | |
| 434 | func (ejvw *extJSONValueWriter) WriteNull() error { |
| 435 | if err := ejvw.ensureElementValue(mode(0), "WriteNull"); err != nil { |
| 436 | return err |
| 437 | } |
| 438 | |
| 439 | ejvw.buf = append(ejvw.buf, []byte("null")...) |
| 440 | ejvw.buf = append(ejvw.buf, ',') |
| 441 | |
| 442 | ejvw.pop() |
| 443 | return nil |
| 444 | } |
| 445 | |
| 446 | func (ejvw *extJSONValueWriter) WriteObjectID(oid primitive.ObjectID) error { |
| 447 | if err := ejvw.ensureElementValue(mode(0), "WriteObjectID"); err != nil { |
| 448 | return err |
| 449 | } |
| 450 | |
| 451 | ejvw.writeExtendedSingleValue("oid", oid.Hex(), true) |
| 452 | ejvw.buf = append(ejvw.buf, ',') |
| 453 | |
| 454 | ejvw.pop() |
| 455 | return nil |
| 456 | } |
| 457 | |
| 458 | func (ejvw *extJSONValueWriter) WriteRegex(pattern string, options string) error { |
| 459 | if err := ejvw.ensureElementValue(mode(0), "WriteRegex"); err != nil { |
| 460 | return err |
| 461 | } |
| 462 | |
| 463 | var buf bytes.Buffer |
| 464 | buf.WriteString(`{"$regularExpression":{"pattern":`) |
| 465 | writeStringWithEscapes(pattern, &buf, ejvw.escapeHTML) |
| 466 | buf.WriteString(`,"options":"`) |
| 467 | buf.WriteString(sortStringAlphebeticAscending(options)) |
| 468 | buf.WriteString(`"}},`) |
| 469 | |
| 470 | ejvw.buf = append(ejvw.buf, buf.Bytes()...) |
| 471 | |
| 472 | ejvw.pop() |
| 473 | return nil |
| 474 | } |
| 475 | |
| 476 | func (ejvw *extJSONValueWriter) WriteString(s string) error { |
| 477 | if err := ejvw.ensureElementValue(mode(0), "WriteString"); err != nil { |
| 478 | return err |
| 479 | } |
| 480 | |
| 481 | var buf bytes.Buffer |
| 482 | writeStringWithEscapes(s, &buf, ejvw.escapeHTML) |
| 483 | |
| 484 | ejvw.buf = append(ejvw.buf, buf.Bytes()...) |
| 485 | ejvw.buf = append(ejvw.buf, ',') |
| 486 | |
| 487 | ejvw.pop() |
| 488 | return nil |
| 489 | } |
| 490 | |
| 491 | func (ejvw *extJSONValueWriter) WriteSymbol(symbol string) error { |
| 492 | if err := ejvw.ensureElementValue(mode(0), "WriteSymbol"); err != nil { |
| 493 | return err |
| 494 | } |
| 495 | |
| 496 | var buf bytes.Buffer |
| 497 | writeStringWithEscapes(symbol, &buf, ejvw.escapeHTML) |
| 498 | |
| 499 | ejvw.writeExtendedSingleValue("symbol", buf.String(), false) |
| 500 | ejvw.buf = append(ejvw.buf, ',') |
| 501 | |
| 502 | ejvw.pop() |
| 503 | return nil |
| 504 | } |
| 505 | |
| 506 | func (ejvw *extJSONValueWriter) WriteTimestamp(t uint32, i uint32) error { |
| 507 | if err := ejvw.ensureElementValue(mode(0), "WriteTimestamp"); err != nil { |
| 508 | return err |
| 509 | } |
| 510 | |
| 511 | var buf bytes.Buffer |
| 512 | buf.WriteString(`{"$timestamp":{"t":`) |
| 513 | buf.WriteString(strconv.FormatUint(uint64(t), 10)) |
| 514 | buf.WriteString(`,"i":`) |
| 515 | buf.WriteString(strconv.FormatUint(uint64(i), 10)) |
| 516 | buf.WriteString(`}},`) |
| 517 | |
| 518 | ejvw.buf = append(ejvw.buf, buf.Bytes()...) |
| 519 | |
| 520 | ejvw.pop() |
| 521 | return nil |
| 522 | } |
| 523 | |
| 524 | func (ejvw *extJSONValueWriter) WriteUndefined() error { |
| 525 | if err := ejvw.ensureElementValue(mode(0), "WriteUndefined"); err != nil { |
| 526 | return err |
| 527 | } |
| 528 | |
| 529 | ejvw.writeExtendedSingleValue("undefined", "true", false) |
| 530 | ejvw.buf = append(ejvw.buf, ',') |
| 531 | |
| 532 | ejvw.pop() |
| 533 | return nil |
| 534 | } |
| 535 | |
| 536 | func (ejvw *extJSONValueWriter) WriteDocumentElement(key string) (ValueWriter, error) { |
| 537 | switch ejvw.stack[ejvw.frame].mode { |
| 538 | case mDocument, mTopLevel, mCodeWithScope: |
| 539 | ejvw.buf = append(ejvw.buf, []byte(fmt.Sprintf(`"%s":`, key))...) |
| 540 | ejvw.push(mElement) |
| 541 | default: |
| 542 | return nil, ejvw.invalidTransitionErr(mElement, "WriteDocumentElement", []mode{mDocument, mTopLevel, mCodeWithScope}) |
| 543 | } |
| 544 | |
| 545 | return ejvw, nil |
| 546 | } |
| 547 | |
| 548 | func (ejvw *extJSONValueWriter) WriteDocumentEnd() error { |
| 549 | switch ejvw.stack[ejvw.frame].mode { |
| 550 | case mDocument, mTopLevel, mCodeWithScope: |
| 551 | default: |
| 552 | return fmt.Errorf("incorrect mode to end document: %s", ejvw.stack[ejvw.frame].mode) |
| 553 | } |
| 554 | |
| 555 | // close the document |
| 556 | if ejvw.buf[len(ejvw.buf)-1] == ',' { |
| 557 | ejvw.buf[len(ejvw.buf)-1] = '}' |
| 558 | } else { |
| 559 | ejvw.buf = append(ejvw.buf, '}') |
| 560 | } |
| 561 | |
| 562 | switch ejvw.stack[ejvw.frame].mode { |
| 563 | case mCodeWithScope: |
| 564 | ejvw.buf = append(ejvw.buf, '}') |
| 565 | fallthrough |
| 566 | case mDocument: |
| 567 | ejvw.buf = append(ejvw.buf, ',') |
| 568 | case mTopLevel: |
| 569 | if ejvw.w != nil { |
| 570 | if _, err := ejvw.w.Write(ejvw.buf); err != nil { |
| 571 | return err |
| 572 | } |
| 573 | ejvw.buf = ejvw.buf[:0] |
| 574 | } |
| 575 | } |
| 576 | |
| 577 | ejvw.pop() |
| 578 | return nil |
| 579 | } |
| 580 | |
| 581 | func (ejvw *extJSONValueWriter) WriteArrayElement() (ValueWriter, error) { |
| 582 | switch ejvw.stack[ejvw.frame].mode { |
| 583 | case mArray: |
| 584 | ejvw.push(mValue) |
| 585 | default: |
| 586 | return nil, ejvw.invalidTransitionErr(mValue, "WriteArrayElement", []mode{mArray}) |
| 587 | } |
| 588 | |
| 589 | return ejvw, nil |
| 590 | } |
| 591 | |
| 592 | func (ejvw *extJSONValueWriter) WriteArrayEnd() error { |
| 593 | switch ejvw.stack[ejvw.frame].mode { |
| 594 | case mArray: |
| 595 | // close the array |
| 596 | if ejvw.buf[len(ejvw.buf)-1] == ',' { |
| 597 | ejvw.buf[len(ejvw.buf)-1] = ']' |
| 598 | } else { |
| 599 | ejvw.buf = append(ejvw.buf, ']') |
| 600 | } |
| 601 | |
| 602 | ejvw.buf = append(ejvw.buf, ',') |
| 603 | |
| 604 | ejvw.pop() |
| 605 | default: |
| 606 | return fmt.Errorf("incorrect mode to end array: %s", ejvw.stack[ejvw.frame].mode) |
| 607 | } |
| 608 | |
| 609 | return nil |
| 610 | } |
| 611 | |
| 612 | func formatDouble(f float64) string { |
| 613 | var s string |
| 614 | if math.IsInf(f, 1) { |
| 615 | s = "Infinity" |
| 616 | } else if math.IsInf(f, -1) { |
| 617 | s = "-Infinity" |
| 618 | } else if math.IsNaN(f) { |
| 619 | s = "NaN" |
| 620 | } else { |
| 621 | // Print exactly one decimalType place for integers; otherwise, print as many are necessary to |
| 622 | // perfectly represent it. |
| 623 | s = strconv.FormatFloat(f, 'G', -1, 64) |
| 624 | if !strings.ContainsRune(s, 'E') && !strings.ContainsRune(s, '.') { |
| 625 | s += ".0" |
| 626 | } |
| 627 | } |
| 628 | |
| 629 | return s |
| 630 | } |
| 631 | |
| 632 | var hexChars = "0123456789abcdef" |
| 633 | |
| 634 | func writeStringWithEscapes(s string, buf *bytes.Buffer, escapeHTML bool) { |
| 635 | buf.WriteByte('"') |
| 636 | start := 0 |
| 637 | for i := 0; i < len(s); { |
| 638 | if b := s[i]; b < utf8.RuneSelf { |
| 639 | if htmlSafeSet[b] || (!escapeHTML && safeSet[b]) { |
| 640 | i++ |
| 641 | continue |
| 642 | } |
| 643 | if start < i { |
| 644 | buf.WriteString(s[start:i]) |
| 645 | } |
| 646 | switch b { |
| 647 | case '\\', '"': |
| 648 | buf.WriteByte('\\') |
| 649 | buf.WriteByte(b) |
| 650 | case '\n': |
| 651 | buf.WriteByte('\\') |
| 652 | buf.WriteByte('n') |
| 653 | case '\r': |
| 654 | buf.WriteByte('\\') |
| 655 | buf.WriteByte('r') |
| 656 | case '\t': |
| 657 | buf.WriteByte('\\') |
| 658 | buf.WriteByte('t') |
| 659 | case '\b': |
| 660 | buf.WriteByte('\\') |
| 661 | buf.WriteByte('b') |
| 662 | case '\f': |
| 663 | buf.WriteByte('\\') |
| 664 | buf.WriteByte('f') |
| 665 | default: |
| 666 | // This encodes bytes < 0x20 except for \t, \n and \r. |
| 667 | // If escapeHTML is set, it also escapes <, >, and & |
| 668 | // because they can lead to security holes when |
| 669 | // user-controlled strings are rendered into JSON |
| 670 | // and served to some browsers. |
| 671 | buf.WriteString(`\u00`) |
| 672 | buf.WriteByte(hexChars[b>>4]) |
| 673 | buf.WriteByte(hexChars[b&0xF]) |
| 674 | } |
| 675 | i++ |
| 676 | start = i |
| 677 | continue |
| 678 | } |
| 679 | c, size := utf8.DecodeRuneInString(s[i:]) |
| 680 | if c == utf8.RuneError && size == 1 { |
| 681 | if start < i { |
| 682 | buf.WriteString(s[start:i]) |
| 683 | } |
| 684 | buf.WriteString(`\ufffd`) |
| 685 | i += size |
| 686 | start = i |
| 687 | continue |
| 688 | } |
| 689 | // U+2028 is LINE SEPARATOR. |
| 690 | // U+2029 is PARAGRAPH SEPARATOR. |
| 691 | // They are both technically valid characters in JSON strings, |
| 692 | // but don't work in JSONP, which has to be evaluated as JavaScript, |
| 693 | // and can lead to security holes there. It is valid JSON to |
| 694 | // escape them, so we do so unconditionally. |
| 695 | // See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion. |
| 696 | if c == '\u2028' || c == '\u2029' { |
| 697 | if start < i { |
| 698 | buf.WriteString(s[start:i]) |
| 699 | } |
| 700 | buf.WriteString(`\u202`) |
| 701 | buf.WriteByte(hexChars[c&0xF]) |
| 702 | i += size |
| 703 | start = i |
| 704 | continue |
| 705 | } |
| 706 | i += size |
| 707 | } |
| 708 | if start < len(s) { |
| 709 | buf.WriteString(s[start:]) |
| 710 | } |
| 711 | buf.WriteByte('"') |
| 712 | } |
| 713 | |
| 714 | type sortableString []rune |
| 715 | |
| 716 | func (ss sortableString) Len() int { |
| 717 | return len(ss) |
| 718 | } |
| 719 | |
| 720 | func (ss sortableString) Less(i, j int) bool { |
| 721 | return ss[i] < ss[j] |
| 722 | } |
| 723 | |
| 724 | func (ss sortableString) Swap(i, j int) { |
| 725 | oldI := ss[i] |
| 726 | ss[i] = ss[j] |
| 727 | ss[j] = oldI |
| 728 | } |
| 729 | |
| 730 | func sortStringAlphebeticAscending(s string) string { |
| 731 | ss := sortableString([]rune(s)) |
| 732 | sort.Sort(ss) |
| 733 | return string([]rune(ss)) |
| 734 | } |