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LibPDF: Make Object::to_deprecated_string() look more like PDF source

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- No , between array or dict elements
- `stream` goes in front of stream data, _after_ the stream dict

Also, print string contents as ASCII if the string data is mostly ASCII.
This commit is contained in:
Nico Weber 2023-07-12 12:19:50 -04:00 • committed by Andreas Kling
parent cf47e130ae
commit b4c5a7d1a0
1 changed files with 35 additions and 17 deletions
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52
Userland/Libraries/LibPDF/ObjectDerivatives.cpp
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@ -85,7 +85,7 @@ DeprecatedString ArrayObject::to_deprecated_string(int indent) const
for (auto& element : elements()) {
if (!first)
builder.append(",\n"sv);
builder.append("\n"sv);
first = false;
append_indent(builder, indent + 1);
builder.appendff("{}", element.to_deprecated_string(indent));
@ -100,12 +100,13 @@ DeprecatedString ArrayObject::to_deprecated_string(int indent) const
DeprecatedString DictObject::to_deprecated_string(int indent) const
{
StringBuilder builder;
append_indent(builder, indent);
builder.append("<<\n"sv);
bool first = true;
for (auto& [key, value] : map()) {
if (!first)
builder.append(",\n"sv);
builder.append("\n"sv);
first = false;
append_indent(builder, indent + 1);
builder.appendff("/{} ", key);
@ -121,25 +122,42 @@ DeprecatedString DictObject::to_deprecated_string(int indent) const
DeprecatedString StreamObject::to_deprecated_string(int indent) const
{
StringBuilder builder;
builder.appendff("{}\n", dict()->to_deprecated_string(indent));
builder.append("stream\n"sv);
append_indent(builder, indent);
builder.appendff("{}\n", dict()->to_deprecated_string(indent + 1));
append_indent(builder, indent + 1);
auto string = encode_hex(bytes());
while (true) {
if (string.length() > 60) {
builder.appendff("{}\n", string.substring(0, 60));
append_indent(builder, indent);
string = string.substring(60);
continue;
}
builder.appendff("{}\n", string);
break;
size_t ascii_count = 0;
for (auto c : bytes()) {
if (c < 128)
++ascii_count;
}
size_t percentage_ascii = 100;
if (bytes().size())
percentage_ascii = ascii_count * 100 / bytes().size();
bool is_mostly_text = percentage_ascii > 95;
if (is_mostly_text) {
for (auto c : bytes()) {
if (c < 128)
builder.append(c);
else
builder.appendff("\\{:03o}", c);
}
} else {
auto string = encode_hex(bytes());
while (true) {
if (string.length() > 60) {
builder.appendff("{}\n", string.substring(0, 60));
append_indent(builder, indent);
string = string.substring(60);
continue;
}
builder.appendff("{}\n", string);
break;
}
}
append_indent(builder, indent);
builder.append("endstream"sv);
return builder.to_deprecated_string();
}