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main.cpp
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#include "./lib/expr_tree.hpp"
#include "iostream"
#include "cstdlib"
#include "string"
#include "cstring"
#include "cstdio"
#include "sstream"
using namespace std;
expr_tree *arr[5];
double *var_list = new double[26];
void help() {
cout << "Welcome to ExT 1.0 NOT_LTS!\n"
<< " * Documentation:\n"
<< " Support operator: +, -, *, /, ^, cos(use C), sin(S), ln(L), exp(E).\n"
<< " Support variable: a-z\n"
<< "\n We have expression container A-D and ~ for result.\n"
<< " How to use: \n\n"
<< " set [A-D] to input an expr.\n"
<< " show [A-D|~] to show an expr.\n"
<< " set [a-z] to set a variable.\n"
<< " show [a-z] to set a variable.\n"
<< " rm [A-D|~] delete sth.\n"
<< " value [A-D|~] get value of expr.\n"
<< " compound [+-*/^] [A-D|~] [A-D|~] compound two expr.\n"
<< " diff [A-D|~] [a-z] partial diff. of value a-z.\n"
<< " merge [A-D|~] merge const.\n\n"
<< " help - get help. exit - exit.\n\n"
<< "\n Enjoy --------\n\n";
}
struct command_exception {
string ex_what;
command_exception( const string &context ) {
ex_what = context;
}
friend ostream &operator<<( ostream &os, const command_exception &ex ) {
os << ex.ex_what;
return os;
}
};
struct cmd_line {
string col[20];
int len;
void build( const string &in ) {
len = 0;
stringstream buf( in );
for( int i = 0; i < 20; ++i ) {
buf >> col[i];
if( col[i] != "" ) {
len++;
}
}
}
void clear() {
len = 0;
for( int i = 0; i < 20; ++i ) {
col[i] = "";
}
}
};
bool is_container( char s ) {
return s <= 'D' && s >= 'A';
}
int get_container_index( char s ) {
return s - 'A';
}
bool is_ans( char s ) {
return s == '~';
}
int get_ans_index() {
return 4;
}
bool is_var( char s ) {
return islower( s );
}
int get_var_index( char s ) {
return s - 'a';
}
void execute( const cmd_line &cmd ) {
if( cmd.len < 1 ) {
throw command_exception( "Empty command." );
}
if( cmd.col[0] == "help" ) {
help();
return;
} else if( cmd.col[0] == "exit" ) {
exit( 0 );
} else if( cmd.col[0] == "set" ) {
if( cmd.len < 2 ) {
throw command_exception( "Not enough param." );
}
if( cmd.len > 2 ) {
throw command_exception( "Too much param." );
}
if( cmd.col[1].length() != 1 ) {
throw command_exception( "Invalid param." );
}
if( is_container( cmd.col[1][0] ) ) {
delete arr[get_container_index( cmd.col[1][0] )];
string expr;
cout << " " << cmd.col[1][0] << " = ";
cin >> expr;
prefix_expr a( expr );
arr[get_container_index( cmd.col[1][0] )] = new expr_tree( a );
arr[get_container_index( cmd.col[1][0] )]->set_var_list( var_list );
cout << " System: " << arr[get_container_index( cmd.col[1][0] )]->infix_output() << endl;
} else if( is_var( cmd.col[1][0] ) ) {
double d;
cout << " " << cmd.col[1][0] << " = ";
cin >> d;
var_list[get_var_index( cmd.col[1][0] )] = d;
cout << " System: " << cmd.col[1][0] << " = " << d << endl;
} else {
throw command_exception( "Invalid param." );
}
} else if( cmd.col[0] == "show" ) {
if( cmd.len < 2 ) {
throw command_exception( "Not enough param." );
}
if( cmd.len > 2 ) {
throw command_exception( "Too much param." );
}
if( cmd.col[1].length() != 1 ) {
throw command_exception( "Invalid param." );
}
if( is_container( cmd.col[1][0] ) ) {
cout << " System: " << cmd.col[1][0] << " = " << arr[get_container_index( cmd.col[1][0] )]->infix_output() << endl;
} else if( is_var( cmd.col[1][0] ) ) {
cout << " System: " << cmd.col[1][0] << " = " << var_list[get_var_index( cmd.col[1][0] )] << endl;
} else if( is_ans( cmd.col[1][0] ) ) {
cout << " System: " << cmd.col[1][0] << " = " << arr[get_ans_index()]->infix_output() << endl;
} else {
throw command_exception( "Invalid param." );
}
} else if( cmd.col[0] == "rm" ) {
if( cmd.len < 2 ) {
throw command_exception( "Not enough param." );
}
if( cmd.len > 2 ) {
throw command_exception( "Too much param." );
}
if( cmd.col[1].length() != 1 ) {
throw command_exception( "Invalid param." );
}
if( is_container( cmd.col[1][0] ) ) {
delete arr[get_container_index( cmd.col[1][0] )];
prefix_expr a( "0" );
arr[get_container_index( cmd.col[1][0] )] = new expr_tree( a );
arr[get_container_index( cmd.col[1][0] )]->set_var_list( var_list );
} else if( is_ans( cmd.col[1][0] ) ) {
delete arr[get_ans_index()];
prefix_expr a( "0" );
arr[get_ans_index()] = new expr_tree( a );
arr[get_ans_index()]->set_var_list( var_list );
} else {
throw command_exception( "Invalid param." );
}
} else if( cmd.col[0] == "value" ) {
if( cmd.len < 2 ) {
throw command_exception( "Not enough param." );
}
if( cmd.len > 2 ) {
throw command_exception( "Too much param." );
}
if( cmd.col[1].length() != 1 ) {
throw command_exception( "Invalid param." );
}
if( is_container( cmd.col[1][0] ) ) {
cout << " System: " << arr[get_container_index( cmd.col[1][0] )]->calculate() << endl;
} else if( is_ans( cmd.col[1][0] ) ) {
cout << " System: " << cmd.col[1][0] << " = " << arr[get_ans_index()]->calculate() << endl;
} else {
throw command_exception( "Invalid param." );
}
} else if( cmd.col[0] == "compound" ) {
if( cmd.len < 4 ) {
throw command_exception( "Not enough param." );
}
if( cmd.len > 4 ) {
throw command_exception( "Too much param." );
}
if( cmd.col[1].length() != 1 ) {
throw command_exception( "Invalid param." );
}
if( cmd.col[2].length() != 1 ) {
throw command_exception( "Invalid param." );
}
if( cmd.col[3].length() != 1 ) {
throw command_exception( "Invalid param." );
}
if( !isoprt( cmd.col[1][0] ) ) {
throw command_exception( "Invalid param.!" );
}
int index_a = -1, index_b = -1;
if( is_container( cmd.col[2][0] ) ) {
index_a = get_container_index( cmd.col[2][0] );
} else if( is_ans( cmd.col[2][0] ) ) {
index_a = get_ans_index();
}
if( is_container( cmd.col[3][0] ) ) {
index_b = get_container_index( cmd.col[3][0] );
} else if( is_ans( cmd.col[3][0] ) ) {
index_b = get_ans_index();
}
if( index_a != -1 && index_b != -1 ) {
expr_tree *ans = new expr_tree( *arr[index_a], cmd.col[1][0], *arr[index_b] );
delete arr[get_ans_index()];
arr[get_ans_index()] = ans;
arr[get_ans_index()]->set_var_list( var_list );
cout << " System: " << cmd.col[2][0] << " " << cmd.col[1][0] << " " << cmd.col[3][0] << " = " << ans->infix_output() << endl;
} else {
throw command_exception( "Invalid param.-" );
}
} else if( cmd.col[0] == "diff" ) {
if( cmd.len < 3 ) {
throw command_exception( "Not enough param." );
}
if( cmd.len > 3 ) {
throw command_exception( "Too much param." );
}
if( cmd.col[1].length() != 1 ) {
throw command_exception( "Invalid param." );
}
if( cmd.col[2].length() != 1 ) {
throw command_exception( "Invalid param." );
}
int index_exp = -1;
if( is_container( cmd.col[1][0] ) ) {
index_exp = get_container_index( cmd.col[1][0] );
} else if( is_ans( cmd.col[1][0] ) ) {
index_exp = get_ans_index();
}
if( is_var( cmd.col[2][0] ) ) {
if( index_exp != -1 ) {
expr_tree *ans = new expr_tree( *arr[index_exp] );
ans->partial_differential( cmd.col[2][0] );
delete arr[get_ans_index()];
arr[get_ans_index()] = ans;
arr[get_ans_index()]->set_var_list( var_list );
cout << " System: d" << cmd.col[1][0] << "/d" << cmd.col[2][0] << " = " << ans->infix_output() << endl;
}
} else {
throw command_exception( "Invalid param." );
}
} else if( cmd.col[0] == "merge" ) {
if( cmd.len < 2 ) {
throw command_exception( "Not enough param." );
}
if( cmd.len > 2 ) {
throw command_exception( "Too much param." );
}
if( cmd.col[1].length() != 1 ) {
throw command_exception( "Invalid param." );
}
if( is_container( cmd.col[1][0] ) ) {
expr_tree *ans = new expr_tree( *arr[get_container_index( cmd.col[1][0] )] );
ans->merge_const();
delete arr[get_ans_index()];
arr[get_ans_index()] = ans;
arr[get_ans_index()]->set_var_list( var_list );
cout << " System: " << cmd.col[1][0] << " = " << ans->infix_output() << endl;
} else if( is_ans( cmd.col[1][0] ) ) {
expr_tree *ans = new expr_tree( *arr[get_ans_index()] );
ans->merge_const();
delete arr[get_ans_index()];
arr[get_ans_index()] = ans;
arr[get_ans_index()]->set_var_list( var_list );
cout << " System: " << cmd.col[1][0] << " = " << ans->infix_output() << endl;
} else {
throw command_exception( "Invalid param." );
}
} else {
throw command_exception( "No such command." );
}
}
int main() {
help();
memset( var_list, 0, sizeof( double ) * 26 );
for( int i = 0; i < 5; ++i ) {
prefix_expr a( "0" );
arr[i] = new expr_tree( a );
arr[i]->set_var_list( var_list );
}
while( 1 ) {
cmd_line cmd_l;
try {
cout << "user@ExT: ";
char c;
string cmd;
do {
c = cin.get();
cmd.push_back( c );
} while( c != '\n' );
cmd.erase( cmd.length() - 1, 1 );
cmd_l.clear();
cmd_l.build( cmd );
execute( cmd_l );
if( cmd_l.col[0] == "set" ) {
cin.get();
}
} catch( expr_exception e ) {
cout << " Expression Exception: ";
cout << e << endl;
prefix_expr a( "0" );
arr[get_container_index( cmd_l.col[1][0] )] = new expr_tree( a );
arr[get_container_index( cmd_l.col[1][0] )]->set_var_list( var_list );
cin.get();
} catch( command_exception e ) {
cout << " Command Exception: ";
cout << e << endl;
} catch( ... ) {
cout << " Unknown Exception.\n";
}
}
return 0;
}