Michael Fabian 'Xaymar' Dirks
113 lines
3.9 KiB
C++
113 lines
3.9 KiB
C++
/// AUTOGENERATED COPYRIGHT HEADER START
|
|
// Copyright (C) 2024 Michael Fabian 'Xaymar' Dirks <info@xaymar.com>
|
|
// AUTOGENERATED COPYRIGHT HEADER END
|
|
#include "parser.hpp"
|
|
#include <algorithm>
|
|
#include <cctype>
|
|
#include <cstdarg>
|
|
#include "error.hpp"
|
|
|
|
blitz::parser::~parser() {}
|
|
|
|
blitz::parser::parser(std::filesystem::path file) : _file(file), _lexer(), _expr()
|
|
{
|
|
_lexer = std::make_shared<blitz::lexer>(file);
|
|
}
|
|
|
|
std::shared_ptr<blitz::ast::node> blitz::parser::current()
|
|
{
|
|
return _expr;
|
|
}
|
|
|
|
std::shared_ptr<blitz::ast::node> blitz::parser::next()
|
|
{
|
|
// This should return an entire "line" of expressions in one go, i.e.:
|
|
// 1. Local a = 1, b = a, c = b+a
|
|
// -> Local(Variable(a, Expression(Integer(1))), Variable(b, Expresssion(Variable(a))), Variable(c, Expression(Add(Variable(b), Variable(a)))
|
|
// 2. Include "HelloWorld.bb"
|
|
// -> Include(String("HelloWorld.bb"))
|
|
// 3. Function HelloWorld()
|
|
// -> Function(HelloWorld, ...)(
|
|
// Not quite sure if the above makes sense, we'd be returning many expressions outside of functions, but only one inside a function? Why even bother with the current/next crap then?
|
|
// Handling Include becomes a problem too. I guess we should actually return expressions on a line by line basis, and let the "compiler" figure out scope and stuff.
|
|
|
|
// Grab the next token to figure out what behavior we should have.
|
|
while (true) {
|
|
auto token = _lexer->next();
|
|
try {
|
|
switch (token.type) {
|
|
case blitz::token::variant::ENDOFFILE:
|
|
// End of file means there's nothing left to parse.
|
|
_expr.reset();
|
|
return nullptr;
|
|
case blitz::token::variant::COMMENT:
|
|
case blitz::token::variant::NEWLINE:
|
|
case blitz::token::variant::SEPARATOR:
|
|
// Ignore some things that aren't very useful right now.
|
|
continue;
|
|
case blitz::token::variant::TEXT:
|
|
return try_parse(token);
|
|
default:
|
|
throw nullptr;
|
|
}
|
|
} catch (blitz::error const& ex) {
|
|
throw ex;
|
|
} catch (std::exception const& ex) {
|
|
throw new blitz::error(_file, token.location, token.location, ex.what());
|
|
} catch (...) {
|
|
throw new blitz::error(_file, token.location, token.location, blitz::format("Token %s unexpected at this point.", token.to_string().c_str()));
|
|
}
|
|
}
|
|
}
|
|
|
|
std::shared_ptr<blitz::ast::node> blitz::parser::try_parse(blitz::token token)
|
|
{
|
|
// ToDo: Switch to a proper Unicode library. Maybe Boost?
|
|
std::string ltext;
|
|
std::transform(token.text.begin(), token.text.end(), ltext.begin(), [](std::string::value_type c) { return std::tolower(c); });
|
|
|
|
if ((ltext == "local") || (ltext == "global")) {
|
|
// Local/Global have the same parsing, but different functionality.
|
|
// Should be:
|
|
// Text Text [Symbol(=) Expression] [Symbol(,) Text [Symbol(=) Expression] [Symbol(,) ...]]
|
|
|
|
} else if (ltext == "global") {
|
|
// Global ...
|
|
|
|
} else if (ltext == "function") {
|
|
} else if (ltext == "select") {
|
|
} else if (ltext == "case") {
|
|
} else if (ltext == "endselect") {
|
|
} else if (ltext == "if") {
|
|
} else if (ltext == "elif") {
|
|
} else if (ltext == "endif") {
|
|
|
|
} else if (ltext == "end") {
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
std::shared_ptr<blitz::ast::node> blitz::parser::try_parse_variable()
|
|
{
|
|
// Text [Symbol(=) Expression(...)] [Symbol(,) [Text [Symbol(=) Expression(...)]]]
|
|
|
|
auto label = _lexer->next();
|
|
if (label != blitz::token::variant::TEXT) {
|
|
throw new blitz::error(_file, label.location, label.location, blitz::format("Unexpected %s, expected Text.", label.to_string().c_str()));
|
|
}
|
|
|
|
auto node = std::make_shared<blitz::ast::variable>(label);
|
|
|
|
auto operand = _lexer->next();
|
|
if (operand == "=") {
|
|
//node->set_value(try_parse_expression());
|
|
} else if (operand == blitz::token::variant::NEWLINE || operand == blitz::token::variant::SEPARATOR || (operand == blitz::token::variant::SYMBOL && operand == ",")) {
|
|
return node;
|
|
} else {
|
|
throw new blitz::error(_file, label.location, operand.location, blitz::format("Unexpected %s, expected Symbol(=), NewLine, Separator, or Symbol(,).", operand.to_string().c_str()));
|
|
}
|
|
|
|
return node;
|
|
}
|