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pyxis/lib/tdeck_ui/UI/LXMF/NomadNetDocument.cpp
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#include "NomadNetDocument.h"
#include <algorithm>
#include <cctype>
#include <cstdlib>
namespace UI::LXMF::NomadNet {
namespace {
bool valid_utf8(const std::string& value) {
for (std::size_t i = 0; i < value.size();) {
const uint8_t lead = static_cast<uint8_t>(value[i]);
if (lead <= 0x7f) { ++i; continue; }
std::size_t continuation = 0;
uint32_t codepoint = 0;
if (lead >= 0xc2 && lead <= 0xdf) { continuation = 1; codepoint = lead & 0x1f; }
else if (lead >= 0xe0 && lead <= 0xef) { continuation = 2; codepoint = lead & 0x0f; }
else if (lead >= 0xf0 && lead <= 0xf4) { continuation = 3; codepoint = lead & 0x07; }
else return false;
if (i + continuation >= value.size()) return false;
for (std::size_t j = 1; j <= continuation; ++j) {
const uint8_t byte = static_cast<uint8_t>(value[i + j]);
if ((byte & 0xc0) != 0x80) return false;
codepoint = (codepoint << 6) | (byte & 0x3f);
}
if ((continuation == 2 && codepoint < 0x800) ||
(continuation == 3 && codepoint < 0x10000) ||
(codepoint >= 0xd800 && codepoint <= 0xdfff) || codepoint > 0x10ffff) return false;
i += continuation + 1;
}
return true;
}
bool first_codepoint(const std::string& value, std::size_t offset,
uint32_t& codepoint, std::size_t& length) {
if (offset >= value.size()) return false;
const uint8_t lead = static_cast<uint8_t>(value[offset]);
if (lead <= 0x7f) {
codepoint = lead;
length = 1;
return true;
}
std::size_t continuation = 0;
if (lead >= 0xc2 && lead <= 0xdf) {
codepoint = lead & 0x1f;
continuation = 1;
} else if (lead >= 0xe0 && lead <= 0xef) {
codepoint = lead & 0x0f;
continuation = 2;
} else if (lead >= 0xf0 && lead <= 0xf4) {
codepoint = lead & 0x07;
continuation = 3;
} else return false;
length = continuation + 1;
if (offset + length > value.size()) return false;
for (std::size_t i = 1; i <= continuation; ++i)
codepoint = (codepoint << 6) |
(static_cast<uint8_t>(value[offset + i]) & 0x3f);
return true;
}
bool parse_micron_color(const std::string& value, uint32_t& result) {
if (value.size() == 3 && value[0] == 'g') {
if (!std::isdigit(static_cast<unsigned char>(value[1])) ||
!std::isdigit(static_cast<unsigned char>(value[2]))) return false;
const uint32_t percent = static_cast<uint32_t>(value[1] - '0') * 10 +
static_cast<uint32_t>(value[2] - '0');
// Urwid first scales gNN to 0..255, then chooses the nearest xterm
// grayscale ramp entry. Preserve that quantization before RGB565.
const uint32_t scaled = (percent * 255 * 2 + 100) / 200;
static constexpr uint8_t levels[] = {
0, 8, 18, 28, 38, 48, 58, 68, 78, 88, 98, 108, 118,
128, 132, 148, 158, 168, 178, 188, 198, 208, 218, 228, 238, 255,
};
uint8_t gray = levels[sizeof(levels) - 1];
for (std::size_t i = 0; i + 1 < sizeof(levels); ++i) {
const uint32_t midpoint =
(static_cast<uint32_t>(levels[i]) + levels[i + 1] + 1) / 2;
if (scaled < midpoint) {
gray = levels[i];
break;
}
}
result = static_cast<uint32_t>(gray) * 0x010101;
return true;
}
if (value.size() != 3 && value.size() != 6) return false;
if (!std::all_of(value.begin(), value.end(), [](unsigned char c) { return std::isxdigit(c); })) return false;
char* end = nullptr;
result = static_cast<uint32_t>(std::strtoul(value.c_str(), &end, 16));
if (value.size() == 3) {
const uint32_t r = (result >> 8) & 0xf, g = (result >> 4) & 0xf, b = result & 0xf;
result = (r * 17 << 16) | (g * 17 << 8) | b * 17;
}
return end && *end == '\0';
}
bool anchor_char(unsigned char c) {
return c < 0x80 && (std::isalnum(c) != 0 || c == '_' || c == '-');
}
void add_anchor(Document& doc, const std::string& name, std::size_t block_index) {
if (name.empty()) return;
if (name.size() > DocumentParser::MAX_ANCHOR_NAME_BYTES) {
doc.mark_truncated(TruncationReason::ANCHOR_NAME_BYTES);
return;
}
for (const auto& anchor : doc.anchors)
if (anchor.name == name) return;
if (doc.anchors.size() >= DocumentParser::MAX_ANCHORS) {
doc.mark_truncated(TruncationReason::ANCHORS);
return;
}
doc.anchors.push_back({name, static_cast<uint16_t>(block_index)});
}
bool modifier_without_arguments(char command) {
switch (command) {
case '!': case '*': case '_': case '=': case 'f': case 'b':
case 'a': case 'c': case 'r': case 'l': case '`': case '<':
case '>': case '{': case '}': return true;
default: return false;
}
}
std::string heading_slug(const std::string& line) {
std::string slug;
slug.reserve(DocumentParser::MAX_ANCHOR_NAME_BYTES + 1);
bool pending_separator = false;
for (std::size_t i = 0; i < line.size();) {
if (line[i] == '`' && i + 1 < line.size()) {
const char command = line[i + 1];
if (command == ':') {
i += 2;
while (i < line.size() && anchor_char(static_cast<unsigned char>(line[i]))) ++i;
continue;
}
if (command == 'F' || command == 'B') {
std::size_t value_start = i + 2;
std::size_t count = 3;
if (value_start < line.size() && line[value_start] == 'T') {
++value_start;
count = 6;
}
uint32_t ignored = 0;
if (value_start + count <= line.size() &&
parse_micron_color(line.substr(value_start, count), ignored)) {
i = value_start + count;
continue;
}
}
if (modifier_without_arguments(command)) {
i += 2;
continue;
}
}
const unsigned char c = static_cast<unsigned char>(line[i]);
if (c < 0x80 && std::isalnum(c) != 0) {
if (pending_separator && !slug.empty() &&
slug.size() <= DocumentParser::MAX_ANCHOR_NAME_BYTES)
slug.push_back('-');
if (slug.size() <= DocumentParser::MAX_ANCHOR_NAME_BYTES)
slug.push_back(static_cast<char>(std::tolower(c)));
pending_separator = false;
++i;
} else {
pending_separator = !slug.empty();
if (c < 0x80) ++i;
else if (c <= 0xdf) i += 2;
else if (c <= 0xef) i += 3;
else i += 4;
}
}
return slug;
}
struct Style {
bool bold = false;
bool italic = false;
bool underline = false;
bool has_foreground = false;
uint32_t foreground = 0;
bool has_background = false;
uint32_t background = 0;
Alignment alignment = Alignment::LEFT;
};
void add_run(Document& doc, Block& block, std::string& text, const Style& style, int link = -1) {
if (text.empty()) return;
if (block.runs.size() >= DocumentParser::MAX_RUNS_PER_LINE) {
doc.mark_truncated(TruncationReason::RUNS_PER_LINE);
text.clear();
return;
}
Run run;
run.text.swap(text);
run.bold = style.bold;
run.italic = style.italic;
run.underline = style.underline;
run.has_foreground = style.has_foreground;
run.foreground = style.foreground;
run.has_background = style.has_background;
run.background = style.background;
run.link_index = link;
block.runs.push_back(std::move(run));
}
uint16_t form_width(const std::string& flags) {
std::string digits;
digits.reserve(flags.size());
for (char c : flags)
if (c != '^' && c != '?' && c != '!') digits.push_back(c);
if (digits.empty()) return DocumentParser::DEFAULT_FIELD_WIDTH;
char* end = nullptr;
const long parsed = std::strtol(digits.c_str(), &end, 10);
if (!end || end == digits.c_str() || *end != '\0') return DocumentParser::DEFAULT_FIELD_WIDTH;
if (parsed <= 0) return 1;
return static_cast<uint16_t>(std::min<long>(parsed, DocumentParser::MAX_FIELD_WIDTH));
}
std::vector<std::string> split_form_descriptor(const std::string& value) {
std::vector<std::string> parts;
std::size_t start = 0;
while (true) {
const std::size_t separator = value.find('|', start);
parts.push_back(value.substr(start, separator == std::string::npos
? std::string::npos : separator - start));
if (separator == std::string::npos) break;
start = separator + 1;
}
return parts;
}
bool add_form_field(Document& doc, Block& block, const std::string& descriptor,
const std::string& data, const Style& style) {
const auto parts = split_form_descriptor(descriptor);
std::string flags;
std::string name = descriptor;
std::string submitted_value;
bool prechecked = false;
if (parts.size() > 1) {
flags = parts[0];
name = parts[1];
if (parts.size() > 2) submitted_value = parts[2];
if (parts.size() > 3) prechecked = parts[3] == "*";
}
FormFieldType type = FormFieldType::TEXT;
bool masked = false;
if (flags.find('^') != std::string::npos) type = FormFieldType::RADIO;
else if (flags.find('?') != std::string::npos) type = FormFieldType::CHECKBOX;
else if (flags.find('!') != std::string::npos) {
type = FormFieldType::PASSWORD;
masked = true;
}
const bool selection = type == FormFieldType::CHECKBOX || type == FormFieldType::RADIO;
std::string value = selection ? (submitted_value.empty() ? data : submitted_value) : data;
const std::string label = selection ? data : std::string();
if (name.size() > DocumentParser::MAX_FIELD_NAME_BYTES) {
doc.mark_truncated(TruncationReason::FORM_NAME_BYTES);
return false;
}
if (value.size() > DocumentParser::MAX_FIELD_VALUE_BYTES) {
doc.mark_truncated(TruncationReason::FORM_VALUE_BYTES);
return false;
}
if (label.size() > DocumentParser::MAX_FIELD_LABEL_BYTES) {
doc.mark_truncated(TruncationReason::FORM_LABEL_BYTES);
return false;
}
if (doc.fields.size() >= DocumentParser::MAX_FIELDS) {
doc.mark_truncated(TruncationReason::FORM_FIELDS);
return false;
}
const std::size_t bytes = name.size() + value.size() + label.size();
if (bytes > DocumentParser::MAX_FORM_BYTES -
std::min(doc.form_bytes, DocumentParser::MAX_FORM_BYTES)) {
doc.mark_truncated(TruncationReason::FORM_BYTES);
return false;
}
if (block.runs.size() >= DocumentParser::MAX_RUNS_PER_LINE) {
doc.mark_truncated(TruncationReason::RUNS_PER_LINE);
return false;
}
if (type == FormFieldType::RADIO && prechecked) {
for (auto& existing : doc.fields)
if (existing.type == FormFieldType::RADIO && existing.name == name)
existing.checked = false;
}
FormField field;
field.id = static_cast<uint16_t>(doc.fields.size());
field.type = type;
field.name = name;
field.value = value;
field.label = label;
std::string width_flags = flags;
width_flags.erase(std::remove_if(width_flags.begin(), width_flags.end(),
[](char value) { return value == '^' || value == '?' || value == '!'; }),
width_flags.end());
field.width = selection ? DocumentParser::DEFAULT_FIELD_WIDTH : form_width(width_flags);
field.checked = selection && prechecked;
field.masked = masked;
doc.form_bytes += bytes;
doc.fields.push_back(std::move(field));
Run placeholder;
placeholder.bold = style.bold;
placeholder.italic = style.italic;
placeholder.underline = style.underline;
placeholder.has_foreground = style.has_foreground;
placeholder.foreground = style.foreground;
placeholder.has_background = style.has_background;
placeholder.background = style.background;
placeholder.field_index = static_cast<int>(doc.fields.size() - 1);
block.runs.push_back(std::move(placeholder));
return true;
}
void parse_inline(Document& doc, Block& block, const std::string& line, Style& style) {
std::string text;
for (std::size_t i = 0; i < line.size();) {
if (line[i] == '\\' && i + 1 < line.size()) {
text.push_back(line[i + 1]); i += 2; continue;
}
if (line[i] != '`') { text.push_back(line[i++]); continue; }
if (i + 1 >= line.size()) { ++i; continue; }
add_run(doc, block, text, style);
const char command = line[i + 1];
i += 2;
if (command == '!') style.bold = !style.bold;
else if (command == '*') style.italic = !style.italic;
else if (command == '_') style.underline = !style.underline;
else if (command == 'c') style.alignment = Alignment::CENTER;
else if (command == 'l') style.alignment = Alignment::LEFT;
else if (command == 'r') style.alignment = Alignment::RIGHT;
else if (command == 'a') style.alignment = Alignment::LEFT;
else if (command == 'f') style.has_foreground = false;
else if (command == 'b') style.has_background = false;
else if (command == 'F') {
std::size_t count = 3;
if (i < line.size() && line[i] == 'T') { ++i; count = 6; }
if (i + count <= line.size()) {
uint32_t value = 0;
if (parse_micron_color(line.substr(i, count), value)) {
style.has_foreground = true;
style.foreground = value;
i += count;
} else doc.malformed = true;
} else doc.malformed = true;
} else if (command == 'B') {
std::size_t count = 3;
if (i < line.size() && line[i] == 'T') { ++i; count = 6; }
if (i + count <= line.size()) {
uint32_t value = 0;
if (parse_micron_color(line.substr(i, count), value)) {
style.has_background = true;
style.background = value;
i += count;
} else doc.malformed = true;
} else doc.malformed = true;
} else if (command == '`') {
style = Style{};
} else if (command == ':') {
const std::size_t name_start = i;
while (i < line.size() && anchor_char(static_cast<unsigned char>(line[i]))) ++i;
add_anchor(doc, line.substr(name_start, i - name_start), doc.blocks.size());
} else if (command == '<') {
const std::size_t descriptor_end = line.find('`', i);
if (descriptor_end == std::string::npos) {
doc.malformed = true;
continue;
}
const std::size_t field_end = line.find('>', descriptor_end + 1);
if (field_end == std::string::npos) {
doc.malformed = true;
continue;
}
add_form_field(doc, block, line.substr(i, descriptor_end - i),
line.substr(descriptor_end + 1, field_end - descriptor_end - 1), style);
i = field_end + 1;
} else if (command == '[') {
const auto close = line.find(']', i);
if (close == std::string::npos) { doc.malformed = true; text += "`["; continue; }
const std::string value = line.substr(i, close - i);
const auto separator = value.find('`');
std::string label = separator == std::string::npos ? value : value.substr(0, separator);
const auto fields_separator = separator == std::string::npos
? std::string::npos : value.find('`', separator + 1);
std::string target = separator == std::string::npos ? value :
value.substr(separator + 1, fields_separator == std::string::npos
? std::string::npos : fields_separator - separator - 1);
std::string fields = fields_separator == std::string::npos
? std::string() : value.substr(fields_separator + 1);
const bool has_third_component = fields_separator != std::string::npos;
const bool has_fields = has_third_component && !fields.empty();
const bool too_many_components = has_third_component &&
value.find('`', fields_separator + 1) != std::string::npos;
if (target.empty() || too_many_components) { doc.malformed = true; }
else if (doc.links.size() < DocumentParser::MAX_LINKS) {
if (label.empty()) label = target;
doc.links.push_back({label, target, fields, has_fields});
std::string link_text = label;
add_run(doc, block, link_text, style, static_cast<int>(doc.links.size() - 1));
} else doc.mark_truncated(TruncationReason::LINKS);
i = close + 1;
} else {
const auto lead = static_cast<unsigned char>(command);
const std::size_t continuation_count =
lead >= 0xc2 && lead <= 0xdf ? 1 :
lead >= 0xe0 && lead <= 0xef ? 2 :
lead >= 0xf0 && lead <= 0xf4 ? 3 : 0;
std::size_t consumed = 0;
while (consumed < continuation_count && i < line.size()) {
const auto next = static_cast<unsigned char>(line[i]);
if ((next & 0xc0) != 0x80) break;
++i;
++consumed;
}
}
}
add_run(doc, block, text, style);
block.alignment = style.alignment;
}
std::string trim_table_cell(const std::string& value) {
std::size_t first = 0;
while (first < value.size() && std::isspace(static_cast<unsigned char>(value[first]))) ++first;
std::size_t last = value.size();
while (last > first && std::isspace(static_cast<unsigned char>(value[last - 1]))) --last;
return value.substr(first, last - first);
}
std::vector<std::string> parse_table_row(const std::string& source) {
std::size_t first = 0;
std::size_t last = source.size();
while (first < last && std::isspace(static_cast<unsigned char>(source[first]))) ++first;
while (last > first && std::isspace(static_cast<unsigned char>(source[last - 1]))) --last;
if (first < last && source[first] == '|') ++first;
if (last > first && source[last - 1] == '|') --last;
std::vector<std::string> cells;
std::string current;
bool escaped = false;
for (std::size_t i = first; i < last; ++i) {
const char value = source[i];
if (escaped) {
current.push_back(value);
escaped = false;
} else if (value == '\\') {
escaped = true;
} else if (value == '|') {
cells.push_back(trim_table_cell(current));
current.clear();
} else {
current.push_back(value);
}
}
cells.push_back(trim_table_cell(current));
return cells;
}
Alignment table_cell_alignment(const std::string& source) {
const std::string value = trim_table_cell(source);
if (!value.empty() && value.front() == ':' && value.back() == ':') return Alignment::CENTER;
if (!value.empty() && value.back() == ':') return Alignment::RIGHT;
return Alignment::LEFT;
}
void append_malformed_table(Document& doc, const std::vector<std::string>& lines,
std::size_t& total_runs) {
if (doc.blocks.size() >= DocumentParser::MAX_BLOCKS) {
doc.mark_truncated(TruncationReason::BLOCKS);
return;
}
if (total_runs >= DocumentParser::MAX_TOTAL_RUNS) {
doc.mark_truncated(TruncationReason::TOTAL_RUNS);
return;
}
Block block;
block.type = BlockType::UNSUPPORTED;
Run run;
run.text = "[Malformed table]";
for (std::size_t i = 0; i < lines.size(); ++i) {
const std::string separator = i == 0 ? " " : " | ";
const std::size_t remaining = DocumentParser::MAX_TABLE_FALLBACK_BYTES -
std::min(run.text.size(), DocumentParser::MAX_TABLE_FALLBACK_BYTES);
if (separator.size() + lines[i].size() <= remaining) {
run.text += separator;
run.text += lines[i];
continue;
}
if (remaining > separator.size()) {
run.text += separator;
std::size_t retained = remaining - separator.size();
retained = std::min(retained, lines[i].size());
while (retained > 0 && retained < lines[i].size() &&
(static_cast<unsigned char>(lines[i][retained]) & 0xc0) == 0x80) --retained;
run.text.append(lines[i], 0, retained);
}
doc.mark_truncated(TruncationReason::TABLE_FALLBACK_BYTES);
break;
}
block.runs.push_back(std::move(run));
doc.blocks.push_back(std::move(block));
++total_runs;
doc.malformed = true;
}
bool append_table(Document& doc, const std::vector<std::string>& lines,
Alignment table_alignment, uint16_t max_width,
Style& style, std::size_t& total_runs) {
if (lines.size() < 2) {
append_malformed_table(doc, lines, total_runs);
return false;
}
if (doc.tables.size() >= DocumentParser::MAX_TABLES) {
doc.mark_truncated(TruncationReason::TABLES);
return false;
}
if (doc.blocks.size() >= DocumentParser::MAX_BLOCKS) {
doc.mark_truncated(TruncationReason::BLOCKS);
return false;
}
const auto header = parse_table_row(lines.front());
const auto alignment_cells = parse_table_row(lines[1]);
const std::size_t columns = std::min(header.size(), DocumentParser::MAX_TABLE_COLUMNS);
if (header.size() > columns) doc.mark_truncated(TruncationReason::TABLE_COLUMNS);
if (columns == 0) {
append_malformed_table(doc, lines, total_runs);
return false;
}
Table table;
table.first_cell = static_cast<uint32_t>(doc.table_cells.size());
table.column_count = static_cast<uint8_t>(columns);
table.alignment = table_alignment;
table.max_width = max_width;
const std::size_t source_rows = lines.size() - 1;
std::size_t rows = std::min(source_rows, DocumentParser::MAX_TABLE_ROWS);
if (source_rows > rows) doc.mark_truncated(TruncationReason::TABLE_ROWS);
const std::size_t document_cells_left = DocumentParser::MAX_TOTAL_TABLE_CELLS -
std::min(doc.table_cells.size(), DocumentParser::MAX_TOTAL_TABLE_CELLS);
const std::size_t table_cells_left = std::min(DocumentParser::MAX_TABLE_CELLS, document_cells_left);
const std::size_t cell_bounded_rows = table_cells_left / columns;
if (rows > cell_bounded_rows) {
rows = cell_bounded_rows;
doc.mark_truncated(TruncationReason::TABLE_CELLS);
}
if (rows == 0) return false;
for (std::size_t row = 0; row < rows; ++row) {
const auto cells = row == 0 ? header : parse_table_row(lines[row + 1]);
for (std::size_t column = 0; column < columns; ++column) {
TableCell cell;
cell.first_run = static_cast<uint32_t>(doc.table_runs.size());
cell.alignment = row == 0 ? Alignment::LEFT :
(column < alignment_cells.size() ? table_cell_alignment(alignment_cells[column]) : Alignment::LEFT);
Block parsed;
if (column < cells.size()) {
std::string cell_source = cells[column];
const bool cell_truncated = cell_source.size() > DocumentParser::MAX_TABLE_CELL_BYTES;
const Style style_before_cell = style;
if (cell_truncated) {
std::size_t retained = DocumentParser::MAX_TABLE_CELL_BYTES;
while (retained > 0 && retained < cell_source.size() &&
(static_cast<unsigned char>(cell_source[retained]) & 0xc0) == 0x80) --retained;
cell_source.resize(retained);
doc.mark_truncated(TruncationReason::TABLE_CELL_BYTES);
}
parse_inline(doc, parsed, cell_source, style);
style = style_before_cell;
}
if (total_runs + parsed.runs.size() > DocumentParser::MAX_TOTAL_RUNS) {
parsed.runs.resize(DocumentParser::MAX_TOTAL_RUNS - total_runs);
doc.mark_truncated(TruncationReason::TOTAL_RUNS);
}
for (auto& run : parsed.runs) doc.table_runs.push_back(std::move(run));
cell.run_count = static_cast<uint16_t>(doc.table_runs.size() - cell.first_run);
total_runs += cell.run_count;
doc.table_cells.push_back(cell);
}
++table.row_count;
if (total_runs >= DocumentParser::MAX_TOTAL_RUNS) break;
}
doc.tables.push_back(table);
Block block;
block.type = BlockType::TABLE;
block.table_index = static_cast<int16_t>(doc.tables.size() - 1);
block.alignment = table_alignment;
doc.blocks.push_back(std::move(block));
return true;
}
} // namespace
Document DocumentParser::parse(const std::string& source) const {
return parse(source.data(), source.size());
}
Document DocumentParser::parse(const char* source, std::size_t size) const {
Document doc;
if (!source && size != 0) {
doc.malformed = true;
return doc;
}
std::size_t retained = std::min(size, MAX_DOCUMENT_BYTES);
while (retained > 0 && retained < size &&
(static_cast<uint8_t>(source[retained]) & 0xc0) == 0x80) --retained;
doc.source_bytes = retained;
if (size > retained) doc.mark_truncated(TruncationReason::DOCUMENT_BYTES);
// Own an exact retained prefix so no find/substr operation can inspect
// attacker-controlled bytes beyond the documented source cap.
const std::string input(source ? source : "", retained);
if (!valid_utf8(input)) {
doc.malformed = true;
return doc;
}
Style style;
bool literal = false;
bool table_mode = false;
bool table_alignment_explicit = false;
Alignment table_alignment = Alignment::LEFT;
uint16_t table_width = DEFAULT_TABLE_WIDTH;
std::size_t table_bytes = 0;
std::vector<std::string> table_lines;
uint8_t section_depth = 0;
std::size_t total_runs = 0;
std::size_t offset = 0;
while (offset <= retained && doc.source_lines < MAX_SOURCE_LINES) {
std::size_t end = input.find('\n', offset);
if (end == std::string::npos || end > retained) end = retained;
std::size_t length = end - offset;
if (length > MAX_SOURCE_LINE_BYTES) {
length = MAX_SOURCE_LINE_BYTES;
while (length > 0 && offset + length < input.size() &&
(static_cast<uint8_t>(input[offset + length]) & 0xc0) == 0x80) --length;
doc.mark_truncated(TruncationReason::SOURCE_LINE_BYTES);
}
std::string line = input.substr(offset, length);
if (!line.empty() && line.back() == '\r') line.pop_back();
const bool first = doc.source_lines == 0;
++doc.source_lines;
offset = end == retained ? retained + 1 : end + 1;
if (first && line.rfind("#!c=", 0) == 0) {
const std::string number = line.substr(4);
if (!number.empty() && std::all_of(number.begin(), number.end(),
[](unsigned char c) { return std::isdigit(c) != 0; })) {
char* parse_end = nullptr;
const unsigned long long parsed = std::strtoull(number.c_str(), &parse_end, 10);
if (parse_end && *parse_end == '\0') {
doc.cache_seconds = static_cast<uint32_t>(
std::min<unsigned long long>(parsed, MAX_CACHE_SECONDS));
} else doc.malformed = true;
} else doc.malformed = true;
continue;
}
if (!table_mode && line.rfind("#!bg=", 0) == 0) {
uint32_t value = 0;
if (parse_micron_color(line.substr(5), value)) { doc.has_background = true; doc.background = value; }
else doc.malformed = true;
continue;
}
if (!table_mode && line.rfind("#!fg=", 0) == 0) {
uint32_t value = 0;
if (parse_micron_color(line.substr(5), value)) { doc.has_foreground = true; doc.foreground = value; }
else doc.malformed = true;
continue;
}
if (line == "`=") { literal = !literal; continue; }
if (line.empty()) {
if (doc.blocks.size() >= MAX_BLOCKS) {
doc.mark_truncated(TruncationReason::BLOCKS);
break;
}
if (total_runs >= MAX_TOTAL_RUNS) {
doc.mark_truncated(TruncationReason::TOTAL_RUNS);
break;
}
Block blank;
blank.depth = section_depth;
Run run;
run.text = " ";
blank.runs.push_back(std::move(run));
doc.blocks.push_back(std::move(blank));
++total_runs;
continue;
}
if (line.empty()) continue;
bool pre_escaped_table_line = false;
if (!literal && line[0] == '\\' &&
(table_mode || line.rfind("\\`t", 0) == 0)) {
line.erase(0, 1);
pre_escaped_table_line = true;
}
if (!literal && !pre_escaped_table_line && !line.empty() && line[0] == '#') continue;
if (!literal && line.rfind("`t", 0) == 0) {
if (table_mode) {
const bool canonical_table_rendered = table_lines.size() >= 2;
append_table(doc, table_lines, table_alignment, table_width, style, total_runs);
table_mode = false;
table_lines.clear();
table_bytes = 0;
if (table_alignment_explicit && canonical_table_rendered)
style.alignment = Alignment::LEFT;
table_alignment_explicit = false;
table_alignment = style.alignment;
table_width = DEFAULT_TABLE_WIDTH;
} else {
table_mode = true;
table_lines.clear();
table_bytes = 0;
table_alignment_explicit = false;
table_alignment = style.alignment;
table_width = DEFAULT_TABLE_WIDTH;
std::size_t option = 2;
if (option < line.size() && (line[option] == 'l' || line[option] == 'c' || line[option] == 'r')) {
table_alignment_explicit = true;
table_alignment = line[option] == 'c' ? Alignment::CENTER :
line[option] == 'r' ? Alignment::RIGHT : Alignment::LEFT;
++option;
}
if (option < line.size()) {
const char* width_start = line.c_str() + option;
char* width_end = nullptr;
const long long parsed = std::strtoll(width_start, &width_end, 10);
while (width_end && *width_end &&
std::isspace(static_cast<unsigned char>(*width_end))) ++width_end;
if (width_end && width_end != width_start && *width_end == '\0') {
if (parsed < 0) table_width = 1;
else if (parsed > 0) table_width = static_cast<uint16_t>(
std::min<unsigned long long>(
static_cast<unsigned long long>(parsed), MAX_TABLE_WIDTH));
}
}
}
continue;
}
if (!literal && table_mode) {
const std::size_t row_bytes = line.size() + 1;
if (row_bytes <= MAX_TABLE_BYTES - std::min(table_bytes, MAX_TABLE_BYTES)) {
table_lines.push_back(line);
table_bytes += row_bytes;
} else {
doc.mark_truncated(TruncationReason::TABLE_BYTES);
}
continue;
}
while (!line.empty() && line[0] == '<') {
section_depth = 0;
line.erase(0, 1);
}
if (line.empty()) continue;
if (!literal && line[0] == '>' && line.find("`<") != std::string::npos) {
const auto first_non_heading = line.find_first_not_of('>');
line.erase(0, first_non_heading == std::string::npos
? line.size() : first_non_heading);
if (line.empty()) continue;
}
if (doc.blocks.size() >= MAX_BLOCKS) {
doc.mark_truncated(TruncationReason::BLOCKS);
break;
}
Block block;
block.depth = section_depth;
if (literal) {
if (line == "\\`=") line = "`=";
Run run;
run.text = line;
block.runs.push_back(std::move(run));
} else if (line[0] == '>') {
block.type = BlockType::HEADING;
std::size_t depth = 0;
while (depth < line.size() && line[depth] == '>') ++depth;
block.depth = static_cast<uint8_t>(std::min<std::size_t>(depth, 255));
section_depth = block.depth;
const std::string heading = line.substr(depth);
parse_inline(doc, block, heading, style);
add_anchor(doc, heading_slug(heading), doc.blocks.size());
} else if (line[0] == '-') {
block.type = BlockType::DIVIDER;
uint32_t codepoint = 0;
std::size_t codepoint_bytes = 0;
if (first_codepoint(line, 1, codepoint, codepoint_bytes) &&
line.size() == 1 + codepoint_bytes && codepoint >= 32) {
block.divider_codepoint = codepoint;
}
} else if (line.rfind("`{", 0) == 0) {
block.type = BlockType::UNSUPPORTED;
Run run;
run.text = "[Unsupported Micron content]";
block.runs.push_back(std::move(run));
doc.unsupported = true;
} else {
parse_inline(doc, block, line, style);
}
const bool total_runs_exceeded =
total_runs + block.runs.size() > MAX_TOTAL_RUNS;
if (total_runs_exceeded) {
block.runs.resize(MAX_TOTAL_RUNS - total_runs);
doc.mark_truncated(TruncationReason::TOTAL_RUNS);
}
total_runs += block.runs.size();
doc.blocks.push_back(std::move(block));
if (total_runs_exceeded) break;
}
if (offset <= retained && doc.source_lines >= MAX_SOURCE_LINES)
doc.mark_truncated(TruncationReason::SOURCE_LINES);
if (table_mode) append_malformed_table(doc, table_lines, total_runs);
if (literal) doc.malformed = true;
return doc;
}
std::string truncation_notice(const Document& document) {
if (document.has_truncation(TruncationReason::DOCUMENT_BYTES))
return "[Page truncated: source exceeds " +
std::to_string(DocumentParser::MAX_DOCUMENT_BYTES / 1024) + " KiB]";
if (document.has_truncation(TruncationReason::SOURCE_LINE_BYTES))
return "[Page truncated: line exceeds " +
std::to_string(DocumentParser::MAX_SOURCE_LINE_BYTES) + " bytes]";
if (document.has_truncation(TruncationReason::SOURCE_LINES))
return "[Page truncated: more than " +
std::to_string(DocumentParser::MAX_SOURCE_LINES) + " lines]";
if (document.has_truncation(TruncationReason::BLOCKS))
return "[Page truncated: more than " +
std::to_string(DocumentParser::MAX_BLOCKS) + " blocks]";
if (document.has_truncation(TruncationReason::RUNS_PER_LINE))
return "[Page truncated: more than " +
std::to_string(DocumentParser::MAX_RUNS_PER_LINE) + " styles on one line]";
if (document.has_truncation(TruncationReason::TOTAL_RUNS))
return "[Page truncated: more than " +
std::to_string(DocumentParser::MAX_TOTAL_RUNS) + " styled runs]";
if (document.has_truncation(TruncationReason::LINKS))
return "[Page truncated: more than " +
std::to_string(DocumentParser::MAX_LINKS) + " links]";
if (document.has_truncation(TruncationReason::ANCHOR_NAME_BYTES))
return "[Page truncated: anchor name exceeds " +
std::to_string(DocumentParser::MAX_ANCHOR_NAME_BYTES) + " bytes]";
if (document.has_truncation(TruncationReason::ANCHORS))
return "[Page truncated: more than " +
std::to_string(DocumentParser::MAX_ANCHORS) + " anchors]";
if (document.has_truncation(TruncationReason::TABLE_FALLBACK_BYTES))
return "[Page truncated: malformed table fallback exceeds " +
std::to_string(DocumentParser::MAX_TABLE_FALLBACK_BYTES) + " bytes]";
if (document.has_truncation(TruncationReason::TABLE_CELL_BYTES))
return "[Page truncated: table cell exceeds " +
std::to_string(DocumentParser::MAX_TABLE_CELL_BYTES) + " bytes]";
if (document.has_truncation(TruncationReason::TABLE_BYTES))
return "[Page truncated: table exceeds " +
std::to_string(DocumentParser::MAX_TABLE_BYTES / 1024) + " KiB]";
if (document.has_truncation(TruncationReason::TABLE_COLUMNS))
return "[Page truncated: more than " +
std::to_string(DocumentParser::MAX_TABLE_COLUMNS) + " table columns]";
if (document.has_truncation(TruncationReason::TABLE_ROWS))
return "[Page truncated: more than " +
std::to_string(DocumentParser::MAX_TABLE_ROWS) + " table rows]";
if (document.has_truncation(TruncationReason::TABLE_CELLS))
return "[Page truncated: too many table cells]";
if (document.has_truncation(TruncationReason::TABLES))
return "[Page truncated: more than " +
std::to_string(DocumentParser::MAX_TABLES) + " tables]";
if (document.has_truncation(TruncationReason::FORM_NAME_BYTES))
return "[Page truncated: form field name exceeds " +
std::to_string(DocumentParser::MAX_FIELD_NAME_BYTES) + " bytes]";
if (document.has_truncation(TruncationReason::FORM_VALUE_BYTES))
return "[Page truncated: form field value exceeds " +
std::to_string(DocumentParser::MAX_FIELD_VALUE_BYTES) + " bytes]";
if (document.has_truncation(TruncationReason::FORM_LABEL_BYTES))
return "[Page truncated: form field label exceeds " +
std::to_string(DocumentParser::MAX_FIELD_LABEL_BYTES) + " bytes]";
if (document.has_truncation(TruncationReason::FORM_BYTES))
return "[Page truncated: form data exceeds " +
std::to_string(DocumentParser::MAX_FORM_BYTES / 1024) + " KiB]";
if (document.has_truncation(TruncationReason::FORM_FIELDS))
return "[Page truncated: more than " +
std::to_string(DocumentParser::MAX_FIELDS) + " form fields]";
return "[Page truncated to device safety limits]";
}
} // namespace UI::LXMF::NomadNet
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