work on streaming cell reading, using ugly copy-pasted code for now [ci

skip]

include/xlnt/workbook/streaming_workbook_reader.hpp

@@ -31,6 +31,10 @@
 
 #include <xlnt/xlnt_config.hpp>
 
+namespace xml {
+class parser;
+}
+
 namespace xlnt {
 
 class cell;
@@ -73,7 +77,7 @@ public:
     /// Beings reading of the next worksheet in the workbook and optionally
     /// returns its title if the last worksheet has not yet been read.
     /// </summary>
-    std::string begin_worksheet();
+    void begin_worksheet();
 
     /// <summary>
     /// Ends reading of the current worksheet in the workbook and optionally
@@ -118,6 +122,11 @@ private:
     std::vector<std::string> worksheet_queue_;
     std::unique_ptr<detail::xlsx_consumer> consumer_;
     std::unique_ptr<workbook> workbook_;
+    std::unique_ptr<std::istream> stream_;
+    std::unique_ptr<std::streambuf> stream_buffer_;
+    std::unique_ptr<std::istream> part_stream_;
+    std::unique_ptr<std::streambuf> part_stream_buffer_;
+    std::unique_ptr<xml::parser> parser_;
 };
 
 } // namespace xlnt

source/detail/serialization/xlsx_consumer.cpp

@@ -148,14 +148,152 @@ void xlsx_consumer::open(std::istream &source)
 
 cell xlsx_consumer::read_cell()
 {
-    return cell(nullptr);
+    if (!has_cell())
+    {
+        return cell(nullptr);
+    }
+
+    auto ws = worksheet(stream_worksheet_);
+
+    if (in_element(qn("spreadsheetml", "sheetData")))
+    {
+        expect_start_element(qn("spreadsheetml", "row"), xml::content::complex); // CT_Row
+        auto row_index = parser().attribute<row_t>("r");
+
+        if (parser().attribute_present("ht"))
+        {
+            ws.row_properties(row_index).height = parser().attribute<double>("ht");
+        }
+
+        if (parser().attribute_present("customHeight"))
+        {
+            ws.row_properties(row_index).custom_height = is_true(parser().attribute("customHeight"));
+        }
+
+        if (parser().attribute_present("hidden") && is_true(parser().attribute("hidden")))
+        {
+            ws.row_properties(row_index).hidden = true;
+        }
+
+        skip_attributes({ qn("x14ac", "dyDescent") });
+        skip_attributes({ "customFormat", "s", "customFont",
+            "outlineLevel", "collapsed", "thickTop", "thickBot",
+            "ph", "spans" });
+    }
+
+    if (!in_element(qn("spreadsheetml", "row")))
+    {
+        return cell(nullptr);
+    }
+
+    expect_start_element(qn("spreadsheetml", "c"), xml::content::complex);
+    auto cell = ws.cell(cell_reference(parser().attribute("r")));
+
+    auto has_type = parser().attribute_present("t");
+    auto type = has_type ? parser().attribute("t") : "n";
+
+    auto has_format = parser().attribute_present("s");
+    auto format_id = static_cast<std::size_t>(has_format ? std::stoull(parser().attribute("s")) : 0LL);
+
+    auto has_value = false;
+    auto value_string = std::string();
+
+    auto has_formula = false;
+    auto has_shared_formula = false;
+    auto formula_value_string = std::string();
+
+    while (in_element(qn("spreadsheetml", "c")))
+    {
+        auto current_element = expect_start_element(xml::content::mixed);
+
+        if (current_element == qn("spreadsheetml", "v")) // s:ST_Xstring
+        {
+            has_value = true;
+            value_string = read_text();
+        }
+        else if (current_element == qn("spreadsheetml", "f")) // CT_CellFormula
+        {
+            has_formula = true;
+
+            if (parser().attribute_present("t"))
+            {
+                has_shared_formula = parser().attribute("t") == "shared";
+            }
+
+            skip_attributes(
+            { "aca", "ref", "dt2D", "dtr", "del1", "del2", "r1", "r2", "ca", "si", "bx" });
+
+            formula_value_string = read_text();
+        }
+        else if (current_element == qn("spreadsheetml", "is")) // CT_Rst
+        {
+            expect_start_element(qn("spreadsheetml", "t"), xml::content::simple);
+            value_string = read_text();
+            expect_end_element(qn("spreadsheetml", "t"));
+        }
+        else
+        {
+            unexpected_element(current_element);
+        }
+
+        expect_end_element(current_element);
+    }
+
+    expect_end_element(qn("spreadsheetml", "c"));
+
+    if (has_formula && !has_shared_formula)
+    {
+        cell.formula(formula_value_string);
+    }
+
+    if (has_value)
+    {
+        if (type == "str")
+        {
+            cell.d_->value_text_ = value_string;
+            cell.data_type(cell::type::formula_string);
+        }
+        else if (type == "inlineStr")
+        {
+            cell.d_->value_text_ = value_string;
+            cell.data_type(cell::type::inline_string);
+        }
+        else if (type == "s")
+        {
+            cell.d_->value_numeric_ = std::stold(value_string);
+            cell.data_type(cell::type::shared_string);
+        }
+        else if (type == "b") // boolean
+        {
+            cell.value(is_true(value_string));
+        }
+        else if (type == "n") // numeric
+        {
+            cell.value(std::stold(value_string));
+        }
+        else if (!value_string.empty() && value_string[0] == '#')
+        {
+            cell.error(value_string);
+        }
+    }
+
+    if (has_format)
+    {
+        cell.format(target_.format(format_id));
+    }
+
+    return cell;
 }
 
-void xlsx_consumer::read_worksheet(const std::string &rel_id)
+void xlsx_consumer::read_worksheet(const std::string &rel_id, bool streaming)
 {
     read_worksheet_begin(rel_id);
-    read_worksheet_sheetdata();
-    read_worksheet_end(rel_id);
+
+    if (!streaming)
+    {
+        read_worksheet_sheetdata();
+        read_worksheet_end(rel_id);
+    }
 }
 
 std::string xlsx_consumer::read_worksheet_begin(const std::string &rel_id)
@@ -874,7 +1012,8 @@ xml::parser &xlsx_consumer::parser()
 
 bool xlsx_consumer::has_cell()
 {
-    return stream_cell_ != nullptr;
+    return in_element(qn("spreadsheetml", "row"))
+        || in_element(qn("spreadsheetml", "sheetData"));
 }
 
 std::vector<relationship> xlsx_consumer::read_relationships(const path &part)
@@ -991,7 +1130,7 @@ void xlsx_consumer::read_part(const std::vector<relationship> &rel_chain, bool s
         break;
 
     case relationship_type::worksheet:
-        read_worksheet(rel_chain.back().id());
+        read_worksheet(rel_chain.back().id(), streaming);
         break;
 
     case relationship_type::thumbnail:

source/detail/serialization/xlsx_consumer.hpp

@@ -198,7 +198,7 @@ private:
 	/// <summary>
 	/// xl/sheets/*.xml
 	/// </summary>
-	void read_worksheet(const std::string &rel_id);
+	void read_worksheet(const std::string &rel_id, bool streaming);
 
     /// <summary>
     /// xl/sheets/*.xml

source/workbook/streaming_workbook_reader.cpp

@@ -1,5 +1,4 @@
-// Copyright (c) 2014-2017 Thomas Fussell
-// Copyright (c) 2010-2015 openpyxl
+// Copyright (c) 2017 Thomas Fussell
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
@@ -27,6 +26,7 @@
 #include <detail/serialization/vector_streambuf.hpp>
 #include <detail/serialization/xlsx_consumer.hpp>
 #include <xlnt/cell/cell.hpp>
+#include <xlnt/packaging/manifest.hpp>
 #include <xlnt/utils/optional.hpp>
 #include <xlnt/workbook/streaming_workbook_reader.hpp>
 #include <xlnt/workbook/workbook.hpp>
@@ -88,6 +88,7 @@ void streaming_workbook_reader::close()
     if (consumer_)
     {
         consumer_.reset(nullptr);
+        stream_buffer_.reset(nullptr);
     }
 }
 
@@ -106,10 +107,25 @@ bool streaming_workbook_reader::has_worksheet()
     return !worksheet_queue_.empty();
 }
 
-std::string streaming_workbook_reader::begin_worksheet()
+void streaming_workbook_reader::begin_worksheet()
 {
-    auto next_worksheet_rel = worksheet_queue_.back();
-    return consumer_->read_worksheet_begin(next_worksheet_rel);
+    const auto next_worksheet_rel = worksheet_queue_.back();
+    const auto workbook_rel = workbook_->manifest()
+        .relationship(path("/"), relationship_type::office_document);
+    const auto worksheet_rel = workbook_->manifest()
+        .relationship(workbook_rel.target().path(), next_worksheet_rel);
+
+    auto rel_chain = std::vector<relationship>{ workbook_rel, worksheet_rel };
+
+    const auto &manifest = consumer_->target_.manifest();
+    const auto part_path = manifest.canonicalize(rel_chain);
+    auto part_stream_buffer = consumer_->archive_->open(part_path);
+    part_stream_buffer_.swap(part_stream_buffer);
+    part_stream_.reset(new std::istream(part_stream_buffer_.get()));
+    parser_.reset(new xml::parser(*part_stream_, part_path.string()));
+    consumer_->parser_ = parser_.get();
+
+    consumer_->read_worksheet_begin(next_worksheet_rel);
 }
 
 worksheet streaming_workbook_reader::end_worksheet()
@@ -121,29 +137,32 @@ worksheet streaming_workbook_reader::end_worksheet()
 
 void streaming_workbook_reader::open(const std::vector<std::uint8_t> &data)
 {
-    detail::vector_istreambuf buffer(data);
-    std::istream buffer_stream(&buffer);
-    open(buffer_stream);
+    stream_buffer_.reset(new detail::vector_istreambuf(data));
+    stream_.reset(new std::istream(stream_buffer_.get()));
+    open(*stream_);
 }
 
 void streaming_workbook_reader::open(const std::string &filename)
 {
-    std::ifstream file_stream;
-    open_stream(file_stream, filename);
+    stream_.reset(new std::ifstream());
+    open_stream((std::ifstream &)stream_, filename);
+    open(*stream_);
 }
 
 #ifdef _MSC_VER
 void streaming_workbook_reader::open(const std::wstring &filename)
 {
-    std::ifstream file_stream;
-    open_stream(file_stream, filename);
+    stream_.reset(new std::ifstream());
+    open_stream((std::ifstream &)*stream_, filename);
+    open(*stream_);
 }
 #endif
 
 void streaming_workbook_reader::open(const xlnt::path &filename)
 {
-    std::ifstream file_stream;
-    open_stream(file_stream, filename.string());
+    stream_.reset(new std::ifstream());
+    open_stream((std::ifstream &)*stream_, filename.string());
+    open(*stream_);
 }
 
 void streaming_workbook_reader::open(std::istream &stream)
@@ -151,6 +170,16 @@ void streaming_workbook_reader::open(std::istream &stream)
     workbook_.reset(new workbook());
     consumer_.reset(new detail::xlsx_consumer(*workbook_));
     consumer_->open(stream);
+
+    const auto workbook_rel = workbook_->manifest()
+        .relationship(path("/"), relationship_type::office_document);
+    const auto workbook_path = workbook_rel.target().path();
+
+    for (auto worksheet_rel : workbook_->manifest()
+        .relationships(workbook_path, relationship_type::worksheet))
+    {
+        worksheet_queue_.push_back(worksheet_rel.id());
+    }
 }
 
 } // namespace xlnt

tests/workbook/serialization_test_suite.hpp

@@ -58,6 +58,8 @@ public:
         register_test(test_read_custom_properties);
         register_test(test_round_trip_rw);
         register_test(test_round_trip_rw_encrypted);
+        register_test(test_streaming_read);
+        //register_test(test_streaming_write);
     }
 
 	bool workbook_matches_file(xlnt::workbook &wb, const xlnt::path &file)