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#pragma once
#include <string>
#include "lexer/enum_type.h"
#include "lexer/token.h"
#include "lexer/shared.h"
using namespace std; // remove this
namespace ov4
{
class T_token;
class T_ast
{
public:
T_ast() = default;
enum_token_type token_type;
string command_text;
size_t left = string::npos;
size_t right = string::npos;
};
string final_trim(size_t _begin, size_t _end)
{
string s;
for (size_t i = _begin; i < _end; i++)
{
if (token[i].token_type != TEXT)
continue;
s += token[i].text + " ";
}
s = s.substr(0, s.size()-1); // eat final space
return s;
}
size_t alloc_ast()
{
ast.emplace_back();
return ast_index++;
}
int get_pivot_order(enum_token_type x)
{
switch(x)
{
case ASYNC:
case SEMICOLON:
return 1000;
case LOGIC_AND:
case LOGIC_OR:
return 500;
case PIPE:
return 100;
default:
return 0;
}
return 0;
}
bool is_operator(enum_token_type x)
{
switch(x)
{
case LOGIC_AND:
case LOGIC_OR:
case PIPE:
case ASYNC:
return true;
default:
return false;
}
}
// region [begin, end)
void parse(size_t cmd_begin, size_t cmd_end, size_t ast_vec)
{
int current_depth = 0;
int current_order = -1;
int max_depth = -1;
size_t found_pos = string::npos;
for (size_t i = cmd_begin; i < cmd_end; i++)
{
if (token[i].bracket_depth > max_depth)
max_depth = token[i].bracket_depth;
}
while (found_pos == string::npos)
{
// scan from right to left
for (size_t i = cmd_end - 1; i >= cmd_begin && i < cmd_end; i--)
{
// if same depth
// and higher order number
if (token[i].bracket_depth == current_depth
&& is_operator(token[i].token_type)
&& get_pivot_order(token[i].token_type) > current_order)
{
current_order = get_pivot_order(token[i].token_type);
found_pos = i;
println("Found pos: {} order: {} depth: {}", i, current_order, current_depth);
}
}
current_depth++;
if (current_depth > max_depth)
{
break;
}
}
if (found_pos == string::npos)
{
println("Smallest unit");
ast[ast_vec].token_type = TEXT;
ast[ast_vec].command_text = final_trim(cmd_begin, cmd_end);
return;
}
size_t l = alloc_ast();
size_t r = alloc_ast();
ast[ast_vec].left = l;
ast[ast_vec].right = r;
ast[ast_vec].token_type = token[found_pos].token_type;
println("Parse sub: {}, {}, {}", cmd_begin, found_pos, cmd_end);
parse(cmd_begin, found_pos, l);
parse(found_pos+1, cmd_end, r);
}
}
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