bython200.cpp

#include <stdlib.h>

#include <iostream>
#include <sstream>
#include <string>
#include <vector>
using namespace std;

typedef struct{
    int index;
    int error;
} parse;

/* "var" name [= expr1] */
int vardef(string program, parse* option){
	if(program.substr(option->index, 3) != "var"){
		option->error = 1;
		return 0;
	}
	int old_index = option->index;
	option->index += 3;
	string vname = name(program, option);
	if(option->error){
		option->index = old_index;
		return 0;
	}
	if(program[option->index] != '='){
		return 0; //TODO
	}
	option->index++;
	int expr = expr1(program, option);
	if(option->error){
		option->index = old_index;
		return 0;
	}
	return 0;//TODO
}

/* name = expr1 */
int vardef(string program, parse* option){
	int old_index = option->index;
	option->index += 3;
	string vname = name(program, option);
	if(option->error){
		return 0;
	}
	if(program[option->index] != '='){
		return 0; //TODO
	}
	option->index++;
	int expr = expr1(program, option);
	if(option->error){
		option->index = old_index;
		return 0;
	}
	return 0;//TODO
}

bython320.cpp

int while_stmt(string program, parse *option){
	int old_index = option->index;
	if(program.substr(option->index, 5) != "while"){
		option->error = 1;
		return 0;
	}
	option->index += 5;
	int cond = expr1(program, option);
	if(program[option->index] != ':'){
		option->error = 1;
		option->index = old_index;
		return 0;
	}
	skips(program, option);
	int stmt = block(program, option);
	if(program.substr(option->index, 3) != "end"){
		option->error = 1;
		option->index = old_index;
		return 0;
	}
	return 0;//TODO
}
int for_stmt(string program, parse* option){
    int old_index = option->index;
    if(program.substr(option->index, 3) != "for"){
        option->error = 1;
        return 0;
	}
    option->index +=  3;
	name(program, option);
	if(program.substr(option->index, 2) != "in"){
		option->error = 1;
		option->index = old_index;
		return 0;
	}
	option->index += 2;
	int cond = expr1(program, option);
    if(program[option->index] != ':'){
        option->error = 1;
        option->index = old_index;
        return 0;
    }
    skips(program, option);
    int stmt1 = block(program, option);
    if(program.substr(option->index, 3) != "end"){
        option->error = 1;
        option->index = old_index;
        return 0;
    }
    return 0;//TODO
}
/*
match [expr]:
	if [expr1]:
		[shori...]
	if [expr2]:
		[shori...]
	else:
		[shori...]
end
*/
int match_stmt(string program, parse* option){
    int old_index = option->index;
    if(program.substr(option->index, 5) != "match"){
        option->error = 1;
        return 0;
    }
	opthion->index += 5;
	int expr;
	if(program[2])
	



}