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/*
* mrustc common tools
* - by John Hodge (Mutabah)
*
* tools/common/toml.h
* - A very basic (and probably incomplete) streaming TOML parser
*/
#pragma once
#include <fstream>
#include <vector>
#include <string>
#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();
// Obtain the next value in the file
TomlKeyValue get_next_value();
};
struct TomlValue
{
enum class Type
{
// A true/false, 1/0, yes/no value
Boolean,
// A double-quoted string
String,
// Integer
Integer,
// A list of other values
List,
};
friend ::std::ostream& operator<<(::std::ostream& os, const Type& e) {
switch(e)
{
case Type::Boolean: os << "boolean"; break;
case Type::String: os << "string"; break;
case Type::Integer: os << "integer"; break;
case Type::List: os << "list"; break;
}
return os;
}
struct TypeError:
public ::std::exception
{
Type have;
Type exp;
TypeError(Type h, Type e):
have(h),
exp(e)
{
}
const char* what() const noexcept override {
return "toml type error";
}
friend ::std::ostream& operator<<(::std::ostream& os, const TypeError& e) {
os << "expected " << e.exp << ", got " << e.have;
return os;
}
};
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(int64_t v):
m_type(Type::Integer),
m_int_value(v)
{
}
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;
}
uint64_t as_int() const {
if(m_type != Type::Integer) {
throw TypeError { m_type, Type::Integer };
}
return m_int_value;
}
const ::std::vector<TomlValue>& as_list() const {
if(m_type != Type::List) {
throw TypeError { m_type, Type::List };
}
return m_sub_values;
}
friend ::std::ostream& operator<<(::std::ostream& os, const TomlValue& x) {
switch(x.m_type)
{
case Type::Boolean: os << (x.m_int_value != 0 ? "true" : "false"); break;
case Type::Integer: os << x.m_int_value; break;
case Type::List:
os << "[";
for(auto& e : x.m_sub_values)
os << e << ",";
os << "]";
break;
case Type::String:
os << "\"" << x.m_str_value << "\"";
break;
}
return os;
}
};
struct TomlKeyValue
{
// Path to the value (last node is the value name)
// TODO: How are things like `[[bin]]` handled?
::std::vector<::std::string> path;
// Relevant value
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;
}
};
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