diff options
Diffstat (limited to 'modules/skjson/src/SkJSON.cpp')
-rw-r--r-- | modules/skjson/src/SkJSON.cpp | 803 |
1 files changed, 0 insertions, 803 deletions
diff --git a/modules/skjson/src/SkJSON.cpp b/modules/skjson/src/SkJSON.cpp deleted file mode 100644 index 2548f4ef41..0000000000 --- a/modules/skjson/src/SkJSON.cpp +++ /dev/null @@ -1,803 +0,0 @@ -/* - * Copyright 2018 Google Inc. - * - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE file. - */ - -#include "SkJSON.h" - -#include "SkMalloc.h" -#include "SkStream.h" -#include "SkString.h" - -#include <cmath> -#include <tuple> -#include <vector> - -namespace skjson { - -// #define SK_JSON_REPORT_ERRORS - -static_assert( sizeof(Value) == 8, ""); -static_assert(alignof(Value) == 8, ""); - -static constexpr size_t kRecAlign = alignof(Value); - -void Value::init_tagged(Tag t) { - memset(fData8, 0, sizeof(fData8)); - fData8[Value::kTagOffset] = SkTo<uint8_t>(t); - SkASSERT(this->getTag() == t); -} - -// Pointer values store a type (in the upper kTagBits bits) and a pointer. -void Value::init_tagged_pointer(Tag t, void* p) { - *this->cast<uintptr_t>() = reinterpret_cast<uintptr_t>(p); - - if (sizeof(Value) == sizeof(uintptr_t)) { - // For 64-bit, we rely on the pointer upper bits being unused/zero. - SkASSERT(!(fData8[kTagOffset] & kTagMask)); - fData8[kTagOffset] |= SkTo<uint8_t>(t); - } else { - // For 32-bit, we need to zero-initialize the upper 32 bits - SkASSERT(sizeof(Value) == sizeof(uintptr_t) * 2); - this->cast<uintptr_t>()[kTagOffset >> 2] = 0; - fData8[kTagOffset] = SkTo<uint8_t>(t); - } - - SkASSERT(this->getTag() == t); - SkASSERT(this->ptr<void>() == p); -} - -NullValue::NullValue() { - this->init_tagged(Tag::kNull); - SkASSERT(this->getTag() == Tag::kNull); -} - -BoolValue::BoolValue(bool b) { - this->init_tagged(Tag::kBool); - *this->cast<bool>() = b; - SkASSERT(this->getTag() == Tag::kBool); -} - -NumberValue::NumberValue(int32_t i) { - this->init_tagged(Tag::kInt); - *this->cast<int32_t>() = i; - SkASSERT(this->getTag() == Tag::kInt); -} - -NumberValue::NumberValue(float f) { - this->init_tagged(Tag::kFloat); - *this->cast<float>() = f; - SkASSERT(this->getTag() == Tag::kFloat); -} - -// Vector recs point to externally allocated slabs with the following layout: -// -// [size_t n] [REC_0] ... [REC_n-1] [optional extra trailing storage] -// -// Long strings use extra_alloc_size == 1 to store the \0 terminator. -// -template <typename T, size_t extra_alloc_size = 0> -static void* MakeVector(const void* src, size_t size, SkArenaAlloc& alloc) { - // The Ts are already in memory, so their size should be safe. - const auto total_size = sizeof(size_t) + size * sizeof(T) + extra_alloc_size; - auto* size_ptr = reinterpret_cast<size_t*>(alloc.makeBytesAlignedTo(total_size, kRecAlign)); - - *size_ptr = size; - sk_careful_memcpy(size_ptr + 1, src, size * sizeof(T)); - - return size_ptr; -} - -ArrayValue::ArrayValue(const Value* src, size_t size, SkArenaAlloc& alloc) { - this->init_tagged_pointer(Tag::kArray, MakeVector<Value>(src, size, alloc)); - SkASSERT(this->getTag() == Tag::kArray); -} - -// Strings have two flavors: -// -// -- short strings (len <= 7) -> these are stored inline, in the record -// (one byte reserved for null terminator/type): -// -// [str] [\0]|[max_len - actual_len] -// -// Storing [max_len - actual_len] allows the 'len' field to double-up as a -// null terminator when size == max_len (this works 'cause kShortString == 0). -// -// -- long strings (len > 7) -> these are externally allocated vectors (VectorRec<char>). -// -// The string data plus a null-char terminator are copied over. -// -namespace { - -// An internal string builder with a fast 8 byte short string load path -// (for the common case where the string is not at the end of the stream). -class FastString final : public Value { -public: - FastString(const char* src, size_t size, const char* eos, SkArenaAlloc& alloc) { - SkASSERT(src <= eos); - - if (size > kMaxInlineStringSize) { - this->initLongString(src, size, alloc); - SkASSERT(this->getTag() == Tag::kString); - return; - } - - static_assert(static_cast<uint8_t>(Tag::kShortString) == 0, "please don't break this"); - static_assert(sizeof(Value) == 8, ""); - - // TODO: LIKELY - if (src + 7 <= eos) { - this->initFastShortString(src, size); - } else { - this->initShortString(src, size); - } - - SkASSERT(this->getTag() == Tag::kShortString); - } - -private: - static constexpr size_t kMaxInlineStringSize = sizeof(Value) - 1; - - void initLongString(const char* src, size_t size, SkArenaAlloc& alloc) { - SkASSERT(size > kMaxInlineStringSize); - - this->init_tagged_pointer(Tag::kString, MakeVector<char, 1>(src, size, alloc)); - - auto* data = this->cast<VectorValue<char, Value::Type::kString>>()->begin(); - const_cast<char*>(data)[size] = '\0'; - } - - void initShortString(const char* src, size_t size) { - SkASSERT(size <= kMaxInlineStringSize); - - this->init_tagged(Tag::kShortString); - sk_careful_memcpy(this->cast<char>(), src, size); - // Null terminator provided by init_tagged() above (fData8 is zero-initialized). - } - - void initFastShortString(const char* src, size_t size) { - SkASSERT(size <= kMaxInlineStringSize); - - // Load 8 chars and mask out the tag and \0 terminator. - uint64_t* s64 = this->cast<uint64_t>(); - memcpy(s64, src, 8); - -#if defined(SK_CPU_LENDIAN) - *s64 &= 0x00ffffffffffffffULL >> ((kMaxInlineStringSize - size) * 8); -#else - static_assert(false, "Big-endian builds are not supported at this time."); -#endif - } -}; - -} // namespace - -StringValue::StringValue(const char* src, size_t size, SkArenaAlloc& alloc) { - new (this) FastString(src, size, src, alloc); -} - -ObjectValue::ObjectValue(const Member* src, size_t size, SkArenaAlloc& alloc) { - this->init_tagged_pointer(Tag::kObject, MakeVector<Member>(src, size, alloc)); - SkASSERT(this->getTag() == Tag::kObject); -} - - -// Boring public Value glue. - -const Value& ObjectValue::operator[](const char* key) const { - // Reverse search for duplicates resolution (policy: return last). - const auto* begin = this->begin(); - const auto* member = this->end(); - - while (member > begin) { - --member; - if (0 == strcmp(key, member->fKey.as<StringValue>().begin())) { - return member->fValue; - } - } - - static const Value g_null = NullValue(); - return g_null; -} - -namespace { - -// Lexer/parser inspired by rapidjson [1], sajson [2] and pjson [3]. -// -// [1] https://github.com/Tencent/rapidjson/ -// [2] https://github.com/chadaustin/sajson -// [3] https://pastebin.com/hnhSTL3h - - -// bit 0 (0x01) - plain ASCII string character -// bit 1 (0x02) - whitespace -// bit 2 (0x04) - string terminator (" \0 [control chars] **AND } ]** <- see matchString notes) -// bit 3 (0x08) - 0-9 -// bit 4 (0x10) - 0-9 e E . -// bit 5 (0x20) - scope terminator (} ]) -static constexpr uint8_t g_token_flags[256] = { - // 0 1 2 3 4 5 6 7 8 9 A B C D E F - 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 6, 4, 4, 6, 4, 4, // 0 - 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, // 1 - 3, 1, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0x11,1, // 2 - 0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19, 0x19,0x19, 1, 1, 1, 1, 1, 1, // 3 - 1, 1, 1, 1, 1, 0x11,1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 4 - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,0x25, 1, 1, // 5 - 1, 1, 1, 1, 1, 0x11,1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 6 - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,0x25, 1, 1, // 7 - - // 128-255 - 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, - 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, - 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, - 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0 -}; - -static inline bool is_ws(char c) { return g_token_flags[static_cast<uint8_t>(c)] & 0x02; } -static inline bool is_eostring(char c) { return g_token_flags[static_cast<uint8_t>(c)] & 0x04; } -static inline bool is_digit(char c) { return g_token_flags[static_cast<uint8_t>(c)] & 0x08; } -static inline bool is_numeric(char c) { return g_token_flags[static_cast<uint8_t>(c)] & 0x10; } -static inline bool is_eoscope(char c) { return g_token_flags[static_cast<uint8_t>(c)] & 0x20; } - -static inline const char* skip_ws(const char* p) { - while (is_ws(*p)) ++p; - return p; -} - -static inline float pow10(int32_t exp) { - static constexpr float g_pow10_table[63] = - { - 1.e-031f, 1.e-030f, 1.e-029f, 1.e-028f, 1.e-027f, 1.e-026f, 1.e-025f, 1.e-024f, - 1.e-023f, 1.e-022f, 1.e-021f, 1.e-020f, 1.e-019f, 1.e-018f, 1.e-017f, 1.e-016f, - 1.e-015f, 1.e-014f, 1.e-013f, 1.e-012f, 1.e-011f, 1.e-010f, 1.e-009f, 1.e-008f, - 1.e-007f, 1.e-006f, 1.e-005f, 1.e-004f, 1.e-003f, 1.e-002f, 1.e-001f, 1.e+000f, - 1.e+001f, 1.e+002f, 1.e+003f, 1.e+004f, 1.e+005f, 1.e+006f, 1.e+007f, 1.e+008f, - 1.e+009f, 1.e+010f, 1.e+011f, 1.e+012f, 1.e+013f, 1.e+014f, 1.e+015f, 1.e+016f, - 1.e+017f, 1.e+018f, 1.e+019f, 1.e+020f, 1.e+021f, 1.e+022f, 1.e+023f, 1.e+024f, - 1.e+025f, 1.e+026f, 1.e+027f, 1.e+028f, 1.e+029f, 1.e+030f, 1.e+031f - }; - - static constexpr int32_t k_exp_offset = SK_ARRAY_COUNT(g_pow10_table) / 2; - - // We only support negative exponents for now. - SkASSERT(exp <= 0); - - return (exp >= -k_exp_offset) ? g_pow10_table[exp + k_exp_offset] - : std::pow(10.0f, static_cast<float>(exp)); -} - -class DOMParser { -public: - explicit DOMParser(SkArenaAlloc& alloc) - : fAlloc(alloc) { - - fValueStack.reserve(kValueStackReserve); - fScopeStack.reserve(kScopeStackReserve); - } - - const Value parse(const char* p, size_t size) { - if (!size) { - return this->error(NullValue(), p, "invalid empty input"); - } - - const char* p_stop = p + size - 1; - - // We're only checking for end-of-stream on object/array close('}',']'), - // so we must trim any whitespace from the buffer tail. - while (p_stop > p && is_ws(*p_stop)) --p_stop; - - SkASSERT(p_stop >= p && p_stop < p + size); - if (!is_eoscope(*p_stop)) { - return this->error(NullValue(), p_stop, "invalid top-level value"); - } - - p = skip_ws(p); - - switch (*p) { - case '{': - goto match_object; - case '[': - goto match_array; - default: - return this->error(NullValue(), p, "invalid top-level value"); - } - - match_object: - SkASSERT(*p == '{'); - p = skip_ws(p + 1); - - this->pushObjectScope(); - - if (*p == '}') goto pop_object; - - // goto match_object_key; - match_object_key: - p = skip_ws(p); - if (*p != '"') return this->error(NullValue(), p, "expected object key"); - - p = this->matchString(p, p_stop, [this](const char* key, size_t size, const char* eos) { - this->pushObjectKey(key, size, eos); - }); - if (!p) return NullValue(); - - p = skip_ws(p); - if (*p != ':') return this->error(NullValue(), p, "expected ':' separator"); - - ++p; - - // goto match_value; - match_value: - p = skip_ws(p); - - switch (*p) { - case '\0': - return this->error(NullValue(), p, "unexpected input end"); - case '"': - p = this->matchString(p, p_stop, [this](const char* str, size_t size, const char* eos) { - this->pushString(str, size, eos); - }); - break; - case '[': - goto match_array; - case 'f': - p = this->matchFalse(p); - break; - case 'n': - p = this->matchNull(p); - break; - case 't': - p = this->matchTrue(p); - break; - case '{': - goto match_object; - default: - p = this->matchNumber(p); - break; - } - - if (!p) return NullValue(); - - // goto match_post_value; - match_post_value: - SkASSERT(!fScopeStack.empty()); - - p = skip_ws(p); - switch (*p) { - case ',': - ++p; - if (fScopeStack.back() >= 0) { - goto match_object_key; - } else { - goto match_value; - } - case ']': - goto pop_array; - case '}': - goto pop_object; - default: - return this->error(NullValue(), p - 1, "unexpected value-trailing token"); - } - - // unreachable - SkASSERT(false); - - pop_object: - SkASSERT(*p == '}'); - - if (fScopeStack.back() < 0) { - return this->error(NullValue(), p, "unexpected object terminator"); - } - - this->popObjectScope(); - - // goto pop_common - pop_common: - SkASSERT(is_eoscope(*p)); - - if (fScopeStack.empty()) { - SkASSERT(fValueStack.size() == 1); - - // Success condition: parsed the top level element and reached the stop token. - return p == p_stop - ? fValueStack.front() - : this->error(NullValue(), p + 1, "trailing root garbage"); - } - - if (p == p_stop) { - return this->error(NullValue(), p, "unexpected end-of-input"); - } - - ++p; - - goto match_post_value; - - match_array: - SkASSERT(*p == '['); - p = skip_ws(p + 1); - - this->pushArrayScope(); - - if (*p != ']') goto match_value; - - // goto pop_array; - pop_array: - SkASSERT(*p == ']'); - - if (fScopeStack.back() >= 0) { - return this->error(NullValue(), p, "unexpected array terminator"); - } - - this->popArrayScope(); - - goto pop_common; - - SkASSERT(false); - return NullValue(); - } - - std::tuple<const char*, const SkString> getError() const { - return std::make_tuple(fErrorToken, fErrorMessage); - } - -private: - SkArenaAlloc& fAlloc; - - static constexpr size_t kValueStackReserve = 256; - static constexpr size_t kScopeStackReserve = 128; - std::vector<Value > fValueStack; - std::vector<intptr_t> fScopeStack; - - const char* fErrorToken = nullptr; - SkString fErrorMessage; - - template <typename VectorT> - void popScopeAsVec(size_t scope_start) { - SkASSERT(scope_start > 0); - SkASSERT(scope_start <= fValueStack.size()); - - using T = typename VectorT::ValueT; - static_assert( sizeof(T) >= sizeof(Value), ""); - static_assert( sizeof(T) % sizeof(Value) == 0, ""); - static_assert(alignof(T) == alignof(Value), ""); - - const auto scope_count = fValueStack.size() - scope_start, - count = scope_count / (sizeof(T) / sizeof(Value)); - SkASSERT(scope_count % (sizeof(T) / sizeof(Value)) == 0); - - const auto* begin = reinterpret_cast<const T*>(fValueStack.data() + scope_start); - - // Instantiate the placeholder value added in onPush{Object/Array}. - fValueStack[scope_start - 1] = VectorT(begin, count, fAlloc); - - // Drop the current scope. - fScopeStack.pop_back(); - fValueStack.resize(scope_start); - } - - void pushObjectScope() { - // Object placeholder. - fValueStack.emplace_back(); - - // Object scope marker (size). - fScopeStack.push_back(SkTo<intptr_t>(fValueStack.size())); - } - - void popObjectScope() { - const auto scope_start = fScopeStack.back(); - SkASSERT(scope_start > 0); - this->popScopeAsVec<ObjectValue>(SkTo<size_t>(scope_start)); - - SkDEBUGCODE( - const auto& obj = fValueStack.back().as<ObjectValue>(); - SkASSERT(obj.is<ObjectValue>()); - for (const auto& member : obj) { - SkASSERT(member.fKey.is<StringValue>()); - } - ) - } - - void pushArrayScope() { - // Array placeholder. - fValueStack.emplace_back(); - - // Array scope marker (-size). - fScopeStack.push_back(-SkTo<intptr_t>(fValueStack.size())); - } - - void popArrayScope() { - const auto scope_start = -fScopeStack.back(); - SkASSERT(scope_start > 0); - this->popScopeAsVec<ArrayValue>(SkTo<size_t>(scope_start)); - - SkDEBUGCODE( - const auto& arr = fValueStack.back().as<ArrayValue>(); - SkASSERT(arr.is<ArrayValue>()); - ) - } - - void pushObjectKey(const char* key, size_t size, const char* eos) { - SkASSERT(fScopeStack.back() >= 0); - SkASSERT(fValueStack.size() >= SkTo<size_t>(fScopeStack.back())); - SkASSERT(!((fValueStack.size() - SkTo<size_t>(fScopeStack.back())) & 1)); - this->pushString(key, size, eos); - } - - void pushTrue() { - fValueStack.push_back(BoolValue(true)); - } - - void pushFalse() { - fValueStack.push_back(BoolValue(false)); - } - - void pushNull() { - fValueStack.push_back(NullValue()); - } - - void pushString(const char* s, size_t size, const char* eos) { - fValueStack.push_back(FastString(s, size, eos, fAlloc)); - } - - void pushInt32(int32_t i) { - fValueStack.push_back(NumberValue(i)); - } - - void pushFloat(float f) { - fValueStack.push_back(NumberValue(f)); - } - - template <typename T> - T error(T&& ret_val, const char* p, const char* msg) { -#if defined(SK_JSON_REPORT_ERRORS) - fErrorToken = p; - fErrorMessage.set(msg); -#endif - return ret_val; - } - - const char* matchTrue(const char* p) { - SkASSERT(p[0] == 't'); - - if (p[1] == 'r' && p[2] == 'u' && p[3] == 'e') { - this->pushTrue(); - return p + 4; - } - - return this->error(nullptr, p, "invalid token"); - } - - const char* matchFalse(const char* p) { - SkASSERT(p[0] == 'f'); - - if (p[1] == 'a' && p[2] == 'l' && p[3] == 's' && p[4] == 'e') { - this->pushFalse(); - return p + 5; - } - - return this->error(nullptr, p, "invalid token"); - } - - const char* matchNull(const char* p) { - SkASSERT(p[0] == 'n'); - - if (p[1] == 'u' && p[2] == 'l' && p[3] == 'l') { - this->pushNull(); - return p + 4; - } - - return this->error(nullptr, p, "invalid token"); - } - - template <typename MatchFunc> - const char* matchString(const char* p, const char* p_stop, MatchFunc&& func) { - SkASSERT(*p == '"'); - const auto* s_begin = p + 1; - - // TODO: unescape - - do { - // Consume string chars. - for (p = p + 1; !is_eostring(*p); ++p); - - if (*p == '"') { - // Valid string found. - func(s_begin, p - s_begin, p_stop); - return p + 1; - } - - // End-of-scope chars are special: we use them to tag the end of the input. - // Thus they cannot be consumed indiscriminately -- we need to check if we hit the - // end of the input. To that effect, we treat them as string terminators above, - // then we catch them here. - } while (is_eoscope(*p) && (p != p_stop)); // Safe scope terminator char, keep going. - - // Premature end-of-input, or illegal string char. - return this->error(nullptr, s_begin - 1, "invalid string"); - } - - const char* matchFastFloatDecimalPart(const char* p, int sign, float f, int exp) { - SkASSERT(exp <= 0); - - for (;;) { - if (!is_digit(*p)) break; - f = f * 10.f + (*p++ - '0'); --exp; - if (!is_digit(*p)) break; - f = f * 10.f + (*p++ - '0'); --exp; - } - - if (is_numeric(*p)) { - SkASSERT(*p == '.' || *p == 'e' || *p == 'E'); - // We either have malformed input, or an (unsupported) exponent. - return nullptr; - } - - this->pushFloat(sign * f * pow10(exp)); - - return p; - } - - const char* matchFastFloatPart(const char* p, int sign, float f) { - for (;;) { - if (!is_digit(*p)) break; - f = f * 10.f + (*p++ - '0'); - if (!is_digit(*p)) break; - f = f * 10.f + (*p++ - '0'); - } - - if (!is_numeric(*p)) { - // Matched (integral) float. - this->pushFloat(sign * f); - return p; - } - - return (*p == '.') ? this->matchFastFloatDecimalPart(p + 1, sign, f, 0) - : nullptr; - } - - const char* matchFast32OrFloat(const char* p) { - int sign = 1; - if (*p == '-') { - sign = -1; - ++p; - } - - const auto* digits_start = p; - - int32_t n32 = 0; - - // This is the largest absolute int32 value we can handle before - // risking overflow *on the next digit* (214748363). - static constexpr int32_t kMaxInt32 = (std::numeric_limits<int32_t>::max() - 9) / 10; - - if (is_digit(*p)) { - n32 = (*p++ - '0'); - for (;;) { - if (!is_digit(*p) || n32 > kMaxInt32) break; - n32 = n32 * 10 + (*p++ - '0'); - } - } - - if (!is_numeric(*p)) { - // Did we actually match any digits? - if (p > digits_start) { - this->pushInt32(sign * n32); - return p; - } - return nullptr; - } - - if (*p == '.') { - const auto* decimals_start = ++p; - - int exp = 0; - - for (;;) { - if (!is_digit(*p) || n32 > kMaxInt32) break; - n32 = n32 * 10 + (*p++ - '0'); --exp; - if (!is_digit(*p) || n32 > kMaxInt32) break; - n32 = n32 * 10 + (*p++ - '0'); --exp; - } - - if (!is_numeric(*p)) { - // Did we actually match any digits? - if (p > decimals_start) { - this->pushFloat(sign * n32 * pow10(exp)); - return p; - } - return nullptr; - } - - if (n32 > kMaxInt32) { - // we ran out on n32 bits - return this->matchFastFloatDecimalPart(p, sign, n32, exp); - } - } - - return this->matchFastFloatPart(p, sign, n32); - } - - const char* matchNumber(const char* p) { - if (const auto* fast = this->matchFast32OrFloat(p)) return fast; - - // slow fallback - char* matched; - float f = strtof(p, &matched); - if (matched > p) { - this->pushFloat(f); - return matched; - } - return this->error(nullptr, p, "invalid numeric token"); - } -}; - -void Write(const Value& v, SkWStream* stream) { - switch (v.getType()) { - case Value::Type::kNull: - stream->writeText("null"); - break; - case Value::Type::kBool: - stream->writeText(*v.as<BoolValue>() ? "true" : "false"); - break; - case Value::Type::kNumber: - stream->writeScalarAsText(*v.as<NumberValue>()); - break; - case Value::Type::kString: - stream->writeText("\""); - stream->writeText(v.as<StringValue>().begin()); - stream->writeText("\""); - break; - case Value::Type::kArray: { - const auto& array = v.as<ArrayValue>(); - stream->writeText("["); - bool first_value = true; - for (const auto& v : array) { - if (!first_value) stream->writeText(","); - Write(v, stream); - first_value = false; - } - stream->writeText("]"); - break; - } - case Value::Type::kObject: - const auto& object = v.as<ObjectValue>(); - stream->writeText("{"); - bool first_member = true; - for (const auto& member : object) { - SkASSERT(member.fKey.getType() == Value::Type::kString); - if (!first_member) stream->writeText(","); - Write(member.fKey, stream); - stream->writeText(":"); - Write(member.fValue, stream); - first_member = false; - } - stream->writeText("}"); - break; - } -} - -} // namespace - -SkString Value::toString() const { - SkDynamicMemoryWStream wstream; - Write(*this, &wstream); - const auto data = wstream.detachAsData(); - // TODO: is there a better way to pass data around without copying? - return SkString(static_cast<const char*>(data->data()), data->size()); -} - -static constexpr size_t kMinChunkSize = 4096; - -DOM::DOM(const char* data, size_t size) - : fAlloc(kMinChunkSize) { - DOMParser parser(fAlloc); - - fRoot = parser.parse(data, size); -} - -void DOM::write(SkWStream* stream) const { - Write(fRoot, stream); -} - -} // namespace skjson |