1 files changed, 127 insertions, 0 deletions
diff --git a/tools/minicargo/toml.h b/tools/minicargo/toml.h
new file mode 100644
index 00000000..1c8f90d5
--- /dev/null
+++ b/tools/minicargo/toml.h
@@ -0,0 +1,127 @@
+#pragma once
+
+#include <fstream>
+#include <vector>
+#include <unordered_map>
+
+class TomlFileIter;
+struct TomlKeyValue;
+
+class TomlFile
+{
+    /// Input file stream
+    ::std::ifstream m_if;
+
+    /// Name of the current `[]` block
+    ::std::vector<::std::string>    m_current_block;
+
+    /// Path suffix of the current composite (none if empty)
+    ::std::vector<::std::string>    m_current_composite;
+
+    /// Index of the next array field (if zero, not parsing an array)
+    unsigned int m_next_array_index;
+
+    /// Next indexes if top-level defined arrays (e.g. `[[foo]]`)
+    ::std::unordered_map<::std::string,unsigned>    m_array_counts;
+
+public:
+    TomlFile(const ::std::string& filename);
+
+    TomlFileIter begin();
+    TomlFileIter end();
+
+    TomlKeyValue get_next_value();
+};
+
+struct TomlValue
+{
+    enum class Type
+    {
+        Boolean,
+        String,
+        Integer,
+        List,
+    };
+    struct TypeError:
+        public ::std::exception
+    {
+        Type have;
+        Type exp;
+
+        TypeError(Type h, Type e):
+            have(h),
+            exp(e)
+        {
+        }
+
+        const char* what() const override {
+            return "toml type error";
+        }
+    };
+
+    Type m_type;
+    uint64_t    m_int_value;
+    ::std::string   m_str_value;
+    ::std::vector<TomlValue>    m_sub_values;
+
+    TomlValue():
+        m_type(Type::String)
+    {
+    }
+    TomlValue(::std::string s):
+        m_type( Type::String ),
+        m_str_value(::std::move(s))
+    {
+    }
+    TomlValue(bool v) :
+        m_type(Type::Boolean),
+        m_int_value(v ? 1 : 0)
+    {
+    }
+
+    const ::std::string& as_string() const {
+        if( m_type != Type::String ) {
+            throw TypeError { m_type, Type::String };
+        }
+        return m_str_value;
+    }
+    bool as_bool() const {
+        if(m_type != Type::Boolean) {
+            throw TypeError { m_type, Type::Boolean };
+        }
+        return m_int_value != 0;
+    }
+};
+
+struct TomlKeyValue
+{
+    ::std::vector<::std::string>    path;
+    TomlValue   value;
+};
+
+class TomlFileIter
+{
+    friend class TomlFile;
+    TomlFile& m_reader;
+    TomlKeyValue    m_cur_value;
+
+    TomlFileIter(TomlFile& tf):
+        m_reader(tf)
+    {
+
+    }
+
+public:
+    TomlKeyValue operator*() const
+    {
+        return m_cur_value;
+    }
+    void operator++()
+    {
+        m_cur_value = m_reader.get_next_value();
+    }
+    bool operator!=(const TomlFileIter& x) const
+    {
+        return m_cur_value.path != x.m_cur_value.path;
+    }
+};