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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "ResourceUtils.h"
#include <algorithm>
#include <sstream>
#include "android-base/stringprintf.h"
#include "androidfw/ResourceTypes.h"
#include "androidfw/ResourceUtils.h"
#include "NameMangler.h"
#include "SdkConstants.h"
#include "format/binary/ResourceTypeExtensions.h"
#include "text/Unicode.h"
#include "text/Utf8Iterator.h"
#include "util/Files.h"
#include "util/Util.h"
using ::aapt::text::Utf8Iterator;
using ::android::ConfigDescription;
using ::android::StringPiece;
using ::android::StringPiece16;
using ::android::base::StringPrintf;
namespace aapt {
namespace ResourceUtils {
Maybe<ResourceName> ToResourceName(
const android::ResTable::resource_name& name_in) {
// TODO: Remove this when ResTable and AssetManager(1) are removed from AAPT2
ResourceName name_out;
if (!name_in.package) {
return {};
}
name_out.package =
util::Utf16ToUtf8(StringPiece16(name_in.package, name_in.packageLen));
const ResourceType* type;
if (name_in.type) {
type = ParseResourceType(
util::Utf16ToUtf8(StringPiece16(name_in.type, name_in.typeLen)));
} else if (name_in.type8) {
type = ParseResourceType(StringPiece(name_in.type8, name_in.typeLen));
} else {
return {};
}
if (!type) {
return {};
}
name_out.type = *type;
if (name_in.name) {
name_out.entry =
util::Utf16ToUtf8(StringPiece16(name_in.name, name_in.nameLen));
} else if (name_in.name8) {
name_out.entry.assign(name_in.name8, name_in.nameLen);
} else {
return {};
}
return name_out;
}
Maybe<ResourceName> ToResourceName(const android::AssetManager2::ResourceName& name_in) {
ResourceName name_out;
if (!name_in.package) {
return {};
}
name_out.package = std::string(name_in.package, name_in.package_len);
const ResourceType* type;
if (name_in.type16) {
type = ParseResourceType(
util::Utf16ToUtf8(StringPiece16(name_in.type16, name_in.type_len)));
} else if (name_in.type) {
type = ParseResourceType(StringPiece(name_in.type, name_in.type_len));
} else {
return {};
}
if (!type) {
return {};
}
name_out.type = *type;
if (name_in.entry16) {
name_out.entry =
util::Utf16ToUtf8(StringPiece16(name_in.entry16, name_in.entry_len));
} else if (name_in.entry) {
name_out.entry = std::string(name_in.entry, name_in.entry_len);
} else {
return {};
}
return name_out;
}
bool ParseResourceName(const StringPiece& str, ResourceNameRef* out_ref,
bool* out_private) {
if (str.empty()) {
return false;
}
size_t offset = 0;
bool priv = false;
if (str.data()[0] == '*') {
priv = true;
offset = 1;
}
StringPiece package;
StringPiece type;
StringPiece entry;
if (!android::ExtractResourceName(str.substr(offset, str.size() - offset), &package, &type,
&entry)) {
return false;
}
const ResourceType* parsed_type = ParseResourceType(type);
if (!parsed_type) {
return false;
}
if (entry.empty()) {
return false;
}
if (out_ref) {
out_ref->package = package;
out_ref->type = *parsed_type;
out_ref->entry = entry;
}
if (out_private) {
*out_private = priv;
}
return true;
}
bool ParseReference(const StringPiece& str, ResourceNameRef* out_ref,
bool* out_create, bool* out_private) {
StringPiece trimmed_str(util::TrimWhitespace(str));
if (trimmed_str.empty()) {
return false;
}
bool create = false;
bool priv = false;
if (trimmed_str.data()[0] == '@') {
size_t offset = 1;
if (trimmed_str.data()[1] == '+') {
create = true;
offset += 1;
}
ResourceNameRef name;
if (!ParseResourceName(
trimmed_str.substr(offset, trimmed_str.size() - offset), &name,
&priv)) {
return false;
}
if (create && priv) {
return false;
}
if (create && name.type != ResourceType::kId) {
return false;
}
if (out_ref) {
*out_ref = name;
}
if (out_create) {
*out_create = create;
}
if (out_private) {
*out_private = priv;
}
return true;
}
return false;
}
bool IsReference(const StringPiece& str) {
return ParseReference(str, nullptr, nullptr, nullptr);
}
bool ParseAttributeReference(const StringPiece& str, ResourceNameRef* out_ref) {
StringPiece trimmed_str(util::TrimWhitespace(str));
if (trimmed_str.empty()) {
return false;
}
if (*trimmed_str.data() == '?') {
StringPiece package;
StringPiece type;
StringPiece entry;
if (!android::ExtractResourceName(trimmed_str.substr(1, trimmed_str.size() - 1), &package,
&type, &entry)) {
return false;
}
if (!type.empty() && type != "attr") {
return false;
}
if (entry.empty()) {
return false;
}
if (out_ref) {
out_ref->package = package;
out_ref->type = ResourceType::kAttr;
out_ref->entry = entry;
}
return true;
}
return false;
}
bool IsAttributeReference(const StringPiece& str) {
return ParseAttributeReference(str, nullptr);
}
/*
* Style parent's are a bit different. We accept the following formats:
*
* @[[*]package:][style/]<entry>
* ?[[*]package:]style/<entry>
* <[*]package>:[style/]<entry>
* [[*]package:style/]<entry>
*/
Maybe<Reference> ParseStyleParentReference(const StringPiece& str,
std::string* out_error) {
if (str.empty()) {
return {};
}
StringPiece name = str;
bool has_leading_identifiers = false;
bool private_ref = false;
// Skip over these identifiers. A style's parent is a normal reference.
if (name.data()[0] == '@' || name.data()[0] == '?') {
has_leading_identifiers = true;
name = name.substr(1, name.size() - 1);
}
if (name.data()[0] == '*') {
private_ref = true;
name = name.substr(1, name.size() - 1);
}
ResourceNameRef ref;
ref.type = ResourceType::kStyle;
StringPiece type_str;
android::ExtractResourceName(name, &ref.package, &type_str, &ref.entry);
if (!type_str.empty()) {
// If we have a type, make sure it is a Style.
const ResourceType* parsed_type = ParseResourceType(type_str);
if (!parsed_type || *parsed_type != ResourceType::kStyle) {
std::stringstream err;
err << "invalid resource type '" << type_str << "' for parent of style";
*out_error = err.str();
return {};
}
}
if (!has_leading_identifiers && ref.package.empty() && !type_str.empty()) {
std::stringstream err;
err << "invalid parent reference '" << str << "'";
*out_error = err.str();
return {};
}
Reference result(ref);
result.private_reference = private_ref;
return result;
}
Maybe<Reference> ParseXmlAttributeName(const StringPiece& str) {
StringPiece trimmed_str = util::TrimWhitespace(str);
const char* start = trimmed_str.data();
const char* const end = start + trimmed_str.size();
const char* p = start;
Reference ref;
if (p != end && *p == '*') {
ref.private_reference = true;
start++;
p++;
}
StringPiece package;
StringPiece name;
while (p != end) {
if (*p == ':') {
package = StringPiece(start, p - start);
name = StringPiece(p + 1, end - (p + 1));
break;
}
p++;
}
ref.name = ResourceName(package, ResourceType::kAttr, name.empty() ? trimmed_str : name);
return Maybe<Reference>(std::move(ref));
}
std::unique_ptr<Reference> TryParseReference(const StringPiece& str,
bool* out_create) {
ResourceNameRef ref;
bool private_ref = false;
if (ParseReference(str, &ref, out_create, &private_ref)) {
std::unique_ptr<Reference> value = util::make_unique<Reference>(ref);
value->private_reference = private_ref;
return value;
}
if (ParseAttributeReference(str, &ref)) {
if (out_create) {
*out_create = false;
}
return util::make_unique<Reference>(ref, Reference::Type::kAttribute);
}
return {};
}
std::unique_ptr<Item> TryParseNullOrEmpty(const StringPiece& str) {
const StringPiece trimmed_str(util::TrimWhitespace(str));
if (trimmed_str == "@null") {
return MakeNull();
} else if (trimmed_str == "@empty") {
return MakeEmpty();
}
return {};
}
std::unique_ptr<Reference> MakeNull() {
// TYPE_NULL with data set to 0 is interpreted by the runtime as an error.
// Instead we set the data type to TYPE_REFERENCE with a value of 0.
return util::make_unique<Reference>();
}
std::unique_ptr<BinaryPrimitive> MakeEmpty() {
return util::make_unique<BinaryPrimitive>(android::Res_value::TYPE_NULL,
android::Res_value::DATA_NULL_EMPTY);
}
std::unique_ptr<BinaryPrimitive> TryParseEnumSymbol(const Attribute* enum_attr,
const StringPiece& str) {
StringPiece trimmed_str(util::TrimWhitespace(str));
for (const Attribute::Symbol& symbol : enum_attr->symbols) {
// Enum symbols are stored as @package:id/symbol resources,
// so we need to match against the 'entry' part of the identifier.
const ResourceName& enum_symbol_resource_name = symbol.symbol.name.value();
if (trimmed_str == enum_symbol_resource_name.entry) {
android::Res_value value = {};
value.dataType = android::Res_value::TYPE_INT_DEC;
value.data = symbol.value;
return util::make_unique<BinaryPrimitive>(value);
}
}
return {};
}
std::unique_ptr<BinaryPrimitive> TryParseFlagSymbol(const Attribute* flag_attr,
const StringPiece& str) {
android::Res_value flags = {};
flags.dataType = android::Res_value::TYPE_INT_HEX;
flags.data = 0u;
if (util::TrimWhitespace(str).empty()) {
// Empty string is a valid flag (0).
return util::make_unique<BinaryPrimitive>(flags);
}
for (const StringPiece& part : util::Tokenize(str, '|')) {
StringPiece trimmed_part = util::TrimWhitespace(part);
bool flag_set = false;
for (const Attribute::Symbol& symbol : flag_attr->symbols) {
// Flag symbols are stored as @package:id/symbol resources,
// so we need to match against the 'entry' part of the identifier.
const ResourceName& flag_symbol_resource_name =
symbol.symbol.name.value();
if (trimmed_part == flag_symbol_resource_name.entry) {
flags.data |= symbol.value;
flag_set = true;
break;
}
}
if (!flag_set) {
return {};
}
}
return util::make_unique<BinaryPrimitive>(flags);
}
static uint32_t ParseHex(char c, bool* out_error) {
if (c >= '0' && c <= '9') {
return c - '0';
} else if (c >= 'a' && c <= 'f') {
return c - 'a' + 0xa;
} else if (c >= 'A' && c <= 'F') {
return c - 'A' + 0xa;
} else {
*out_error = true;
return 0xffffffffu;
}
}
std::unique_ptr<BinaryPrimitive> TryParseColor(const StringPiece& str) {
StringPiece color_str(util::TrimWhitespace(str));
const char* start = color_str.data();
const size_t len = color_str.size();
if (len == 0 || start[0] != '#') {
return {};
}
android::Res_value value = {};
bool error = false;
if (len == 4) {
value.dataType = android::Res_value::TYPE_INT_COLOR_RGB4;
value.data = 0xff000000u;
value.data |= ParseHex(start[1], &error) << 20;
value.data |= ParseHex(start[1], &error) << 16;
value.data |= ParseHex(start[2], &error) << 12;
value.data |= ParseHex(start[2], &error) << 8;
value.data |= ParseHex(start[3], &error) << 4;
value.data |= ParseHex(start[3], &error);
} else if (len == 5) {
value.dataType = android::Res_value::TYPE_INT_COLOR_ARGB4;
value.data |= ParseHex(start[1], &error) << 28;
value.data |= ParseHex(start[1], &error) << 24;
value.data |= ParseHex(start[2], &error) << 20;
value.data |= ParseHex(start[2], &error) << 16;
value.data |= ParseHex(start[3], &error) << 12;
value.data |= ParseHex(start[3], &error) << 8;
value.data |= ParseHex(start[4], &error) << 4;
value.data |= ParseHex(start[4], &error);
} else if (len == 7) {
value.dataType = android::Res_value::TYPE_INT_COLOR_RGB8;
value.data = 0xff000000u;
value.data |= ParseHex(start[1], &error) << 20;
value.data |= ParseHex(start[2], &error) << 16;
value.data |= ParseHex(start[3], &error) << 12;
value.data |= ParseHex(start[4], &error) << 8;
value.data |= ParseHex(start[5], &error) << 4;
value.data |= ParseHex(start[6], &error);
} else if (len == 9) {
value.dataType = android::Res_value::TYPE_INT_COLOR_ARGB8;
value.data |= ParseHex(start[1], &error) << 28;
value.data |= ParseHex(start[2], &error) << 24;
value.data |= ParseHex(start[3], &error) << 20;
value.data |= ParseHex(start[4], &error) << 16;
value.data |= ParseHex(start[5], &error) << 12;
value.data |= ParseHex(start[6], &error) << 8;
value.data |= ParseHex(start[7], &error) << 4;
value.data |= ParseHex(start[8], &error);
} else {
return {};
}
return error ? std::unique_ptr<BinaryPrimitive>()
: util::make_unique<BinaryPrimitive>(value);
}
Maybe<bool> ParseBool(const StringPiece& str) {
StringPiece trimmed_str(util::TrimWhitespace(str));
if (trimmed_str == "true" || trimmed_str == "TRUE" || trimmed_str == "True") {
return Maybe<bool>(true);
} else if (trimmed_str == "false" || trimmed_str == "FALSE" ||
trimmed_str == "False") {
return Maybe<bool>(false);
}
return {};
}
Maybe<uint32_t> ParseInt(const StringPiece& str) {
std::u16string str16 = util::Utf8ToUtf16(str);
android::Res_value value;
if (android::ResTable::stringToInt(str16.data(), str16.size(), &value)) {
return value.data;
}
return {};
}
Maybe<ResourceId> ParseResourceId(const StringPiece& str) {
StringPiece trimmed_str(util::TrimWhitespace(str));
std::u16string str16 = util::Utf8ToUtf16(trimmed_str);
android::Res_value value;
if (android::ResTable::stringToInt(str16.data(), str16.size(), &value)) {
if (value.dataType == android::Res_value::TYPE_INT_HEX) {
ResourceId id(value.data);
if (id.is_valid_dynamic()) {
return id;
}
}
}
return {};
}
Maybe<int> ParseSdkVersion(const StringPiece& str) {
StringPiece trimmed_str(util::TrimWhitespace(str));
std::u16string str16 = util::Utf8ToUtf16(trimmed_str);
android::Res_value value;
if (android::ResTable::stringToInt(str16.data(), str16.size(), &value)) {
return static_cast<int>(value.data);
}
// Try parsing the code name.
std::pair<StringPiece, int> entry = GetDevelopmentSdkCodeNameAndVersion();
if (entry.first == trimmed_str) {
return entry.second;
}
// Try parsing codename from "[codename].[preview_sdk_fingerprint]" value.
const StringPiece::const_iterator begin = std::begin(trimmed_str);
const StringPiece::const_iterator end = std::end(trimmed_str);
const StringPiece::const_iterator codename_end = std::find(begin, end, '.');
if (codename_end != end && entry.first == trimmed_str.substr(begin, codename_end)) {
return entry.second;
}
return {};
}
std::unique_ptr<BinaryPrimitive> TryParseBool(const StringPiece& str) {
if (Maybe<bool> maybe_result = ParseBool(str)) {
const uint32_t data = maybe_result.value() ? 0xffffffffu : 0u;
return util::make_unique<BinaryPrimitive>(android::Res_value::TYPE_INT_BOOLEAN, data);
}
return {};
}
std::unique_ptr<BinaryPrimitive> MakeBool(bool val) {
return util::make_unique<BinaryPrimitive>(android::Res_value::TYPE_INT_BOOLEAN,
val ? 0xffffffffu : 0u);
}
std::unique_ptr<BinaryPrimitive> TryParseInt(const StringPiece& str) {
std::u16string str16 = util::Utf8ToUtf16(util::TrimWhitespace(str));
android::Res_value value;
if (!android::ResTable::stringToInt(str16.data(), str16.size(), &value)) {
return {};
}
return util::make_unique<BinaryPrimitive>(value);
}
std::unique_ptr<BinaryPrimitive> MakeInt(uint32_t val) {
return util::make_unique<BinaryPrimitive>(android::Res_value::TYPE_INT_DEC, val);
}
std::unique_ptr<BinaryPrimitive> TryParseFloat(const StringPiece& str) {
std::u16string str16 = util::Utf8ToUtf16(util::TrimWhitespace(str));
android::Res_value value;
if (!android::ResTable::stringToFloat(str16.data(), str16.size(), &value)) {
return {};
}
return util::make_unique<BinaryPrimitive>(value);
}
uint32_t AndroidTypeToAttributeTypeMask(uint16_t type) {
switch (type) {
case android::Res_value::TYPE_NULL:
case android::Res_value::TYPE_REFERENCE:
case android::Res_value::TYPE_ATTRIBUTE:
case android::Res_value::TYPE_DYNAMIC_REFERENCE:
case android::Res_value::TYPE_DYNAMIC_ATTRIBUTE:
return android::ResTable_map::TYPE_REFERENCE;
case android::Res_value::TYPE_STRING:
return android::ResTable_map::TYPE_STRING;
case android::Res_value::TYPE_FLOAT:
return android::ResTable_map::TYPE_FLOAT;
case android::Res_value::TYPE_DIMENSION:
return android::ResTable_map::TYPE_DIMENSION;
case android::Res_value::TYPE_FRACTION:
return android::ResTable_map::TYPE_FRACTION;
case android::Res_value::TYPE_INT_DEC:
case android::Res_value::TYPE_INT_HEX:
return android::ResTable_map::TYPE_INTEGER |
android::ResTable_map::TYPE_ENUM |
android::ResTable_map::TYPE_FLAGS;
case android::Res_value::TYPE_INT_BOOLEAN:
return android::ResTable_map::TYPE_BOOLEAN;
case android::Res_value::TYPE_INT_COLOR_ARGB8:
case android::Res_value::TYPE_INT_COLOR_RGB8:
case android::Res_value::TYPE_INT_COLOR_ARGB4:
case android::Res_value::TYPE_INT_COLOR_RGB4:
return android::ResTable_map::TYPE_COLOR;
default:
return 0;
};
}
std::unique_ptr<Item> TryParseItemForAttribute(
const StringPiece& value, uint32_t type_mask,
const std::function<void(const ResourceName&)>& on_create_reference) {
using android::ResTable_map;
auto null_or_empty = TryParseNullOrEmpty(value);
if (null_or_empty) {
return null_or_empty;
}
bool create = false;
auto reference = TryParseReference(value, &create);
if (reference) {
if (create && on_create_reference) {
on_create_reference(reference->name.value());
}
return std::move(reference);
}
if (type_mask & ResTable_map::TYPE_COLOR) {
// Try parsing this as a color.
auto color = TryParseColor(value);
if (color) {
return std::move(color);
}
}
if (type_mask & ResTable_map::TYPE_BOOLEAN) {
// Try parsing this as a boolean.
auto boolean = TryParseBool(value);
if (boolean) {
return std::move(boolean);
}
}
if (type_mask & ResTable_map::TYPE_INTEGER) {
// Try parsing this as an integer.
auto integer = TryParseInt(value);
if (integer) {
return std::move(integer);
}
}
const uint32_t float_mask =
ResTable_map::TYPE_FLOAT | ResTable_map::TYPE_DIMENSION | ResTable_map::TYPE_FRACTION;
if (type_mask & float_mask) {
// Try parsing this as a float.
auto floating_point = TryParseFloat(value);
if (floating_point) {
if (type_mask & AndroidTypeToAttributeTypeMask(floating_point->value.dataType)) {
return std::move(floating_point);
}
}
}
return {};
}
/**
* We successively try to parse the string as a resource type that the Attribute
* allows.
*/
std::unique_ptr<Item> TryParseItemForAttribute(
const StringPiece& str, const Attribute* attr,
const std::function<void(const ResourceName&)>& on_create_reference) {
using android::ResTable_map;
const uint32_t type_mask = attr->type_mask;
auto value = TryParseItemForAttribute(str, type_mask, on_create_reference);
if (value) {
return value;
}
if (type_mask & ResTable_map::TYPE_ENUM) {
// Try parsing this as an enum.
auto enum_value = TryParseEnumSymbol(attr, str);
if (enum_value) {
return std::move(enum_value);
}
}
if (type_mask & ResTable_map::TYPE_FLAGS) {
// Try parsing this as a flag.
auto flag_value = TryParseFlagSymbol(attr, str);
if (flag_value) {
return std::move(flag_value);
}
}
return {};
}
std::string BuildResourceFileName(const ResourceFile& res_file, const NameMangler* mangler) {
std::stringstream out;
out << "res/" << res_file.name.type;
if (res_file.config != ConfigDescription{}) {
out << "-" << res_file.config;
}
out << "/";
if (mangler && mangler->ShouldMangle(res_file.name.package)) {
out << NameMangler::MangleEntry(res_file.name.package, res_file.name.entry);
} else {
out << res_file.name.entry;
}
out << file::GetExtension(res_file.source.path);
return out.str();
}
std::unique_ptr<Item> ParseBinaryResValue(const ResourceType& type, const ConfigDescription& config,
const android::ResStringPool& src_pool,
const android::Res_value& res_value,
StringPool* dst_pool) {
if (type == ResourceType::kId) {
return util::make_unique<Id>();
}
const uint32_t data = util::DeviceToHost32(res_value.data);
switch (res_value.dataType) {
case android::Res_value::TYPE_STRING: {
const std::string str = util::GetString(src_pool, data);
const android::ResStringPool_span* spans = src_pool.styleAt(data);
// Check if the string has a valid style associated with it.
if (spans != nullptr && spans->name.index != android::ResStringPool_span::END) {
StyleString style_str = {str};
while (spans->name.index != android::ResStringPool_span::END) {
style_str.spans.push_back(Span{util::GetString(src_pool, spans->name.index),
spans->firstChar, spans->lastChar});
spans++;
}
return util::make_unique<StyledString>(dst_pool->MakeRef(
style_str, StringPool::Context(StringPool::Context::kNormalPriority, config)));
} else {
if (type != ResourceType::kString && util::StartsWith(str, "res/")) {
// This must be a FileReference.
std::unique_ptr<FileReference> file_ref =
util::make_unique<FileReference>(dst_pool->MakeRef(
str, StringPool::Context(StringPool::Context::kHighPriority, config)));
if (type == ResourceType::kRaw) {
file_ref->type = ResourceFile::Type::kUnknown;
} else if (util::EndsWith(*file_ref->path, ".xml")) {
file_ref->type = ResourceFile::Type::kBinaryXml;
} else if (util::EndsWith(*file_ref->path, ".png")) {
file_ref->type = ResourceFile::Type::kPng;
}
return std::move(file_ref);
}
// There are no styles associated with this string, so treat it as a simple string.
return util::make_unique<String>(dst_pool->MakeRef(str, StringPool::Context(config)));
}
} break;
case android::Res_value::TYPE_REFERENCE:
case android::Res_value::TYPE_ATTRIBUTE:
case android::Res_value::TYPE_DYNAMIC_REFERENCE:
case android::Res_value::TYPE_DYNAMIC_ATTRIBUTE: {
Reference::Type ref_type = Reference::Type::kResource;
if (res_value.dataType == android::Res_value::TYPE_ATTRIBUTE ||
res_value.dataType == android::Res_value::TYPE_DYNAMIC_ATTRIBUTE) {
ref_type = Reference::Type::kAttribute;
}
if (data == 0u) {
// A reference of 0, must be the magic @null reference.
return util::make_unique<Reference>();
}
// This is a normal reference.
return util::make_unique<Reference>(data, ref_type);
} break;
}
// Treat this as a raw binary primitive.
return util::make_unique<BinaryPrimitive>(res_value);
}
// Converts the codepoint to UTF-8 and appends it to the string.
static bool AppendCodepointToUtf8String(char32_t codepoint, std::string* output) {
ssize_t len = utf32_to_utf8_length(&codepoint, 1);
if (len < 0) {
return false;
}
const size_t start_append_pos = output->size();
// Make room for the next character.
output->resize(output->size() + len);
char* dst = &*(output->begin() + start_append_pos);
utf32_to_utf8(&codepoint, 1, dst, len + 1);
return true;
}
// Reads up to 4 UTF-8 characters that represent a Unicode escape sequence, and appends the
// Unicode codepoint represented by the escape sequence to the string.
static bool AppendUnicodeEscapeSequence(Utf8Iterator* iter, std::string* output) {
char32_t code = 0;
for (size_t i = 0; i < 4 && iter->HasNext(); i++) {
char32_t codepoint = iter->Next();
char32_t a;
if (codepoint >= U'0' && codepoint <= U'9') {
a = codepoint - U'0';
} else if (codepoint >= U'a' && codepoint <= U'f') {
a = codepoint - U'a' + 10;
} else if (codepoint >= U'A' && codepoint <= U'F') {
a = codepoint - U'A' + 10;
} else {
return {};
}
code = (code << 4) | a;
}
return AppendCodepointToUtf8String(code, output);
}
StringBuilder::StringBuilder(bool preserve_spaces)
: preserve_spaces_(preserve_spaces), quote_(preserve_spaces) {
}
StringBuilder& StringBuilder::AppendText(const std::string& text) {
if (!error_.empty()) {
return *this;
}
const size_t previous_len = xml_string_.text.size();
Utf8Iterator iter(text);
while (iter.HasNext()) {
char32_t codepoint = iter.Next();
if (!preserve_spaces_ && !quote_ && (codepoint <= std::numeric_limits<char>::max())
&& isspace(static_cast<char>(codepoint))) {
if (!last_codepoint_was_space_) {
// Emit a space if it's the first.
xml_string_.text += ' ';
last_codepoint_was_space_ = true;
}
// Keep eating spaces.
continue;
}
// This is not a space.
last_codepoint_was_space_ = false;
if (codepoint == U'\\') {
if (iter.HasNext()) {
codepoint = iter.Next();
switch (codepoint) {
case U't':
xml_string_.text += '\t';
break;
case U'n':
xml_string_.text += '\n';
break;
case U'#':
case U'@':
case U'?':
case U'"':
case U'\'':
case U'\\':
xml_string_.text += static_cast<char>(codepoint);
break;
case U'u':
if (!AppendUnicodeEscapeSequence(&iter, &xml_string_.text)) {
error_ =
StringPrintf("invalid unicode escape sequence in string\n\"%s\"", text.c_str());
return *this;
}
break;
default:
// Ignore the escape character and just include the codepoint.
AppendCodepointToUtf8String(codepoint, &xml_string_.text);
break;
}
}
} else if (!preserve_spaces_ && codepoint == U'"') {
// Only toggle the quote state when we are not preserving spaces.
quote_ = !quote_;
} else if (!preserve_spaces_ && !quote_ && codepoint == U'\'') {
// This should be escaped when we are not preserving spaces
error_ = StringPrintf("unescaped apostrophe in string\n\"%s\"", text.c_str());
return *this;
} else {
AppendCodepointToUtf8String(codepoint, &xml_string_.text);
}
}
// Accumulate the added string's UTF-16 length.
const uint8_t* utf8_data = reinterpret_cast<const uint8_t*>(xml_string_.text.c_str());
const size_t utf8_length = xml_string_.text.size();
ssize_t len = utf8_to_utf16_length(utf8_data + previous_len, utf8_length - previous_len);
if (len < 0) {
error_ = StringPrintf("invalid unicode code point in string\n\"%s\"", utf8_data + previous_len);
return *this;
}
utf16_len_ += static_cast<uint32_t>(len);
return *this;
}
StringBuilder::SpanHandle StringBuilder::StartSpan(const std::string& name) {
if (!error_.empty()) {
return 0u;
}
// When we start a span, all state associated with whitespace truncation and quotation is ended.
ResetTextState();
Span span;
span.name = name;
span.first_char = span.last_char = utf16_len_;
xml_string_.spans.push_back(std::move(span));
return xml_string_.spans.size() - 1;
}
void StringBuilder::EndSpan(SpanHandle handle) {
if (!error_.empty()) {
return;
}
// When we end a span, all state associated with whitespace truncation and quotation is ended.
ResetTextState();
xml_string_.spans[handle].last_char = utf16_len_ - 1u;
}
StringBuilder::UntranslatableHandle StringBuilder::StartUntranslatable() {
if (!error_.empty()) {
return 0u;
}
UntranslatableSection section;
section.start = section.end = xml_string_.text.size();
xml_string_.untranslatable_sections.push_back(section);
return xml_string_.untranslatable_sections.size() - 1;
}
void StringBuilder::EndUntranslatable(UntranslatableHandle handle) {
if (!error_.empty()) {
return;
}
xml_string_.untranslatable_sections[handle].end = xml_string_.text.size();
}
FlattenedXmlString StringBuilder::GetFlattenedString() const {
return xml_string_;
}
std::string StringBuilder::to_string() const {
return xml_string_.text;
}
StringBuilder::operator bool() const {
return error_.empty();
}
std::string StringBuilder::GetError() const {
return error_;
}
void StringBuilder::ResetTextState() {
quote_ = preserve_spaces_;
last_codepoint_was_space_ = false;
}
} // namespace ResourceUtils
} // namespace aapt