C++ eat_whitespace函数代码示例

//reads the format from gen_hgf.
void Player::load_hgf(Board board, Node * node, FILE * fd){
	char c, buf[101];

	eat_whitespace(fd);

	assert(fscanf(fd, "(;%c[%100[^]]]", &c, buf) > 0);

	assert(board.toplay() == (c == 'W' ? 1 : 2));
	node->move = Move(buf);
	board.move(node->move);

	assert(fscanf(fd, "C[%100[^]]]", buf) > 0);

	vecstr entry, parts = explode(string(buf), ", ");
	assert(parts[0] == "mcts");

	entry = explode(parts[1], ":");
	assert(entry[0] == "sims");
	uword sims = from_str<uword>(entry[1]);

	entry = explode(parts[2], ":");
	assert(entry[0] == "avg");
	double avg = from_str<double>(entry[1]);

	uword wins = sims*avg;
	node->exp.addwins(wins);
	node->exp.addlosses(sims - wins);

	entry = explode(parts[3], ":");
	assert(entry[0] == "outcome");
	node->outcome = from_str<int>(entry[1]);

	entry = explode(parts[4], ":");
	assert(entry[0] == "best");
	node->bestmove = Move(entry[1]);


	eat_whitespace(fd);

	if(fpeek(fd) != ')'){
		create_children_simple(board, node);

		while(fpeek(fd) != ')'){
			Node child;
			load_hgf(board, & child, fd);

			Node * i = find_child(node, child.move);
			*i = child;          //copy the child experience to the tree
			i->swap_tree(child); //move the child subtree to the tree

			assert(child.children.empty());

			eat_whitespace(fd);
		}
	}

	eat_char(fd, ')');

	return;
}

static int _parse_array(char **s, struct json_result *result) {

    int rc;
    struct json_array *array = visit_array_start(result);
    while (1) {
        rc = _parse(s, result);
        if (!rc) return 0;
        rc = visit_array_add(result, array);
        if (!rc) return 0;
        eat_whitespace(s);
        if (**s == ']') {
            ++*s;
            break;
        }
        else if (**s == ',') {
            ++*s;
            eat_whitespace(s);
        }
        else {
            return 0;
        }
    }
    visit_array_end(result, array);
    return 1;
}

/*
 * Scan a section name and remember it in `cursec'.
 */
static void parse_section(FILE *fp)
{
    int c, i, end;

    /* We've already got the '['. Scan past initial white space. */
    c = eat_whitespace(fp);
    i = 0;
    end = 0;
    while (c > 0) {
        if (i > (bsize-2)) {
            bsize += 1024;
            bufr = realloc(bufr, bsize);
            if (! bufr) {
                fprintf(stderr, "%s: malloc failed\n", confname);
                exit(-1);
            }
        }
        switch (c) {
        case ']':       /* found the closing bracked */
            bufr[end] = '\0';
            if (end == 0) {
                fprintf(stderr, "%s: empty section name\n", confname);
                exit(-1);
            }
            /* Register a section. */
            if (cursec)
                free(cursec);
            cursec = strdup(bufr);

            eat_comment(fp);
            return;

        case '\n':
            i = find_continuation(bufr, i);
            if (i < 0) {
                bufr [end] = 0;
                fprintf(stderr, "%s: invalid line: '%s'\n",
                    confname, bufr);
                exit(-1);
            }
            end = ((i > 0) && (bufr[i-1] == ' ')) ? (i-1) : (i);
            c = getc(fp);
            break;

        default:
            if (isspace(c)) {
                bufr[end] = ' ';
                i = end + 1;
                c = eat_whitespace(fp);
            } else {
                bufr[i++] = c;
                end = i;
                c = getc(fp);
            }
            break;
        }
    }
}

command_stream_t
make_command_stream (int (*get_next_byte) (void *),
		     void *get_next_byte_argument)
{
  line_count = 1;
  char buffer[1024] = "";
  get_byte = get_next_byte;
  get_byte_argument = get_next_byte_argument;
  command_stream_t stream = checked_malloc(sizeof(struct command_stream));
  command_node_t node = checked_malloc(sizeof(struct command_node));
  command_node_t temp_node = node;
  command_node_t head = NULL;    
  command_node_t tail = NULL;
  if(!feof(get_byte_argument))
  {
    eat_whitespace();
    if((buffer[0] = get_byte(get_byte_argument)) == EOF)
    {
      free(stream);
      free(node);
      return NULL;
    }
    ungetc(buffer[0], get_byte_argument);
    buffer[0] = '\0';
    enum command_type type = scan(buffer);  

    while(1)  
    {
      if(type == SEQUENCE_COMMAND)
        temp_node = make_node(buffer, SIMPLE_COMMAND);
      else
        temp_node = make_node(buffer, type);	
      if(!head)
      {
      	head = temp_node;
      }
      else
      {
	      tail->next = temp_node;
        temp_node->prev = tail;
      }
      tail = temp_node;
      if(type == SEQUENCE_COMMAND)
        break;
      eat_whitespace();
      if((buffer[0] = get_byte(get_byte_argument)) == EOF)
      {
        stream->commands = &head;
        return stream;
      }
      ungetc(buffer[0], get_byte_argument);
      buffer[0] = '\0';
      type = scan(buffer);
    }
  }
  stream->commands = &head;
  return stream;
}

struct json_val *json_parse_object(struct read_state *state)
{
    struct json_val *value;
    char ch;
    int i;
    value = malloc(sizeof(*value));
    value->type = JSON_OBJECT;
    value->length = 0;
    value->object = 0;

    if (*state->read++ != '{') {
        json_error_print(state, "Internal error parsing object\n");
        goto fail;
    }

    if (!eat_whitespace(state)) {
        json_error_print(state, "Unexpected end of file parsing object\n");
        goto fail;
    }
    ch = *state->read++;
    if (ch == '}') {
        //pass
    } else if(ch == '\"'){
        do {
            read_state_put_back(state);
            value->length++;
            value->object = realloc(value->object, value->length * sizeof(*value->object));
            value->object[value->length-1] = json_parse_object_field(state);
            if (value->object[value->length-1].key == 0 || value->object[value->length-1].value == 0)
                goto fail;

            if (!eat_whitespace(state)) {
                json_error_print(state, "Unexpected end of file parsing object\n");
                goto fail;
            }
            ch = *state->read++;
            if (ch != '}' && ch != ',') {
                json_error_print(state, "Unexpected character reading object\n");
                goto fail;
            }
            if (!eat_whitespace(state) && ch != '}') {
                json_error_print(state, "Unexpected end of file parsing object\n");
                goto fail;
            }
        } while(ch == ',');
    }
    return value;

    fail:
    json_free_value(value);
    return 0;
}

static int parse_object(lua_State *L, parse_state *state) {
    assert(*state->ptr == '{');
    state->ptr++;
    eat_whitespace(state);
    lua_newtable(L);
    if (*state->ptr == '}') {
        // empty object
        state->ptr++;
        return 1;
    }
    while (1) {
        // key
        if (!parse_string(L, state)) {
            lua_remove(L, -2); // remove table
            return 0;
        }
        eat_whitespace(state);
        if (*state->ptr != ':') {
            lua_pop(L, 2); // pop table and key
            return push_parse_error(L, state, "colon expected");
        }
        state->ptr++;
        // value
        eat_whitespace(state);
        if (!parse_value(L, state)) {
            lua_remove(L, -2); // remove key
            lua_remove(L, -2); // remove table
            return 0;
        }
        lua_rawset(L, -3);
        eat_whitespace(state);
        if (*state->ptr == ',') {
            state->ptr++;
            eat_whitespace(state);
        } else {
            break;
        }
    }
    if (*state->ptr == 0) {
        lua_pop(L, 1); // pop table.
        return push_parse_error(L, state, "unterminated object");
    }
    if (*state->ptr != '}') {
        lua_pop(L, 1); // pop table
        return push_parse_error(L, state, "unexpected character");
    }
    state->ptr++;
    return 1;
}

static scheme_object* read_pair(vm* context, FILE* in)
{
	int c;
	scheme_object* car = NULL;
	scheme_object* cdr = NULL;
	eat_whitespace(in);
	c = getc(in);
	
	if(c ==')')
	{
		return the_empty_list;
	}

	gc_push_root((void**) &car);
	gc_push_root((void**) &cdr);
	
	ungetc(c, in);
	
	car = read(context, in);
	eat_whitespace(in);
	
	c = getc(in);
	if(c == '.')
	{
		if(!is_delimiter(peek(in)))
		{
			fprintf(stderr, "Expected a delimiter after '.'...\n");
			exit(1);
		}		
		cdr = read(context, in);
		
		eat_whitespace(in);

		c = getc(in);
		if(c != ')')
		{
			fprintf(stderr, "Expected a ')'\n");
			exit(1);
		}
	}
	else
	{
		ungetc(c, in);
		cdr = read_pair(context, in);
	}
	gc_pop_root();
	gc_pop_root();
	return cons(context, car, cdr);
}

/*
 * Expects a string as its only argument.
 * Returns either the parsed value or nil and an error message.
 */
int ltLuaParseJSON(lua_State *L) {
    ltLuaCheckNArgs(L, 1);
    const char *input = lua_tostring(L, 1);
    if (input == NULL) {
        return luaL_error(L, "Argument 1 must be a string");
    }
    int top = lua_gettop(L);
    parse_state state;
    state.start = input;
    state.ptr = input;

    int ok = parse_value(L, &state);
    if (ok) {
        eat_whitespace(&state);
        if (*state.ptr == 0) {
            return 1; // parsed value will be at top + 1.
        } else {
            lua_pop(L, 1); // pop value
            lua_pushnil(L);
            push_parse_error(L, &state, "unexpected trailing characters");
            return 2;
        }
    } else {
        // Error message will be on top of stack.
        // Insert nil before err msg.
        lua_pushnil(L);
        lua_insert(L, top + 1);
        return 2;
    }
}

void JsonIn::skip_array()
{
    char ch;
    int brackets = 1;
    eat_whitespace();
    stream->get(ch);
    if (ch != '[') {
        std::stringstream err;
        err << line_number(-1) << ": expected array but found '" << ch << "'";
        throw err.str();
    }
    while (brackets && stream->good()) {
        stream->get(ch);
        // ignore everything inside strings
        if (ch == '"') {
            stream->unget();
            skip_string();
        // otherwise count opening and closing brackets until they all match
        } else if (ch == '[') {
            brackets += 1;
        } else if (ch == ']') {
            brackets -= 1;
        }
    }
    if (brackets != 0) {
        // something messed up!
        std::stringstream err;
        err << "couldn't find end of array!";
        err << " " << brackets << " bracket(s) left.";
        throw err.str();
    }
    skip_separator();
}

/** Helper: parse space-separated arguments from the string <b>s</b> ending at
 * <b>eol</b>, and store them in the args field of <b>tok</b>.  Store the
 * number of parsed elements into the n_args field of <b>tok</b>.  Allocate
 * all storage in <b>area</b>.  Return the number of arguments parsed, or
 * return -1 if there was an insanely high number of arguments. */
static inline int
get_token_arguments(memarea_t *area, directory_token_t *tok,
                    const char *s, const char *eol)
{
/** Largest number of arguments we'll accept to any token, ever. */
#define MAX_ARGS 512
  char *mem = memarea_strndup(area, s, eol-s);
  char *cp = mem;
  int j = 0;
  char *args[MAX_ARGS];
  while (*cp) {
    if (j == MAX_ARGS)
      return -1;
    args[j++] = cp;
    cp = (char*)find_whitespace(cp);
    if (!cp || !*cp)
      break; /* End of the line. */
    *cp++ = '\0';
    cp = (char*)eat_whitespace(cp);
  }
  tok->n_args = j;
  tok->args = memarea_memdup(area, args, j*sizeof(char*));
  return j;
#undef MAX_ARGS
}

bool JsonIn::skip_value()
{
    char ch;
    bool foundsep;
    eat_whitespace();
    ch = peek();
    // it's either a string '"'
    if (ch == '"') {
        foundsep = skip_string();
    // or an object '{'
    } else if (ch == '{') {
        foundsep = skip_object();
    // or an array '['
    } else if (ch == '[') {
        foundsep = skip_array();
    // or a number (-0123456789)
    } else if (ch == '-' || (ch >= '0' && ch <= '9')) {
        foundsep = skip_number();
    // or "true", "false" or "null"
    } else if (ch == 't') {
        foundsep = skip_true();
    } else if (ch == 'f') {
        foundsep = skip_false();
    } else if (ch == 'n') {
        foundsep = skip_null();
    // or an error.
    } else {
        std::stringstream err;
        err << line_number() << ": expected JSON value but got '" << ch << "'";
        throw err.str();
    }
    return foundsep;//b( foundsep || skip_separator() );
}

err_t extract_value(chunk_t *value, chunk_t *line)
{
	char delimiter = ' ';

	if (!eat_whitespace(line))
	{
		*value = chunk_empty;
		return NULL;
	}
	if (*line->ptr == '\'' || *line->ptr == '"')
	{
		delimiter = *line->ptr;
		line->ptr++;  line->len--;
	}
	if (!extract_token(value, delimiter, line))
	{
		if (delimiter == ' ')
		{
			*value = *line;
			line->len = 0;
		}
		else
		{
			return "missing second delimiter";
		}
	}
	return NULL;
}

void JsonIn::skip_separator()
{
    char ch;
    eat_whitespace();
    ch = peek();
    if (ch == ',') {
        if (strict && ate_separator) {
            error("duplicate separator");
        }
        stream->get();
        ate_separator = true;
    } else if (ch == ']' || ch == '}' || ch == ':') {
        // okay
        if (strict && ate_separator) {
            std::stringstream err;
            err << "separator should not be found before '" << ch << "'";
            uneat_whitespace();
            error(err.str());
        }
        ate_separator = false;
    } else if (ch == EOF) {
        // that's okay too... probably
        if (strict && ate_separator) {
            uneat_whitespace();
            error("separator at end of file not strictly allowed");
        }
        ate_separator = false;
    } else if (strict) {
        // not okay >:(
        uneat_whitespace();
        error("missing separator", 1);
    }
}

/*
 * Read the next token into the 'token' argument.  If there is a
 * newline after the token then 'newline' is set to 1.  The return
 * value is the number of characters added to 'token' or EOF if the
 * end of file is reached.
 */
static int next_token(FILE * f, char token[], int size, int *newline)
{
    unsigned int i = 0;
    int c = eat_whitespace(f);

    if (c == EOF)
	return EOF;

    if (c == '\n')
	goto out;

    for (i = 0; i < size - 1; i += 1) {
	token[i] = c;
	c = fgetc(f);
	if (isspace(c) || c == EOF) {
	    i += 1;
	    break;
	}
    }

    if (!isspace(c) && c != EOF) {
	fprintf(stderr, "Warning: token is too long. Truncating!\n");
	c = eat_non_whitespace(f);
    }

  out:
    token[i] = '\0';
    *newline = c == '\n';
    debug_printf(DEBUG_SPAM, "token: [%s], newline=%s\n", token,
	    *newline ? "true" : "false");
    return i;
}

pointer parse_expr(parser* parse)
{
    eat_whitespace(parse);
    pointer ret_car;
    pointer ret_cdr;
    switch(*parse->curr)
    {
    case '(':
        parse->curr++;
        ret_car = parse_expr(parse);
        ret_cdr = parse_expr(parse);
        return create_pair(ret_car, ret_cdr);
    case '"':
        ret_car = parse_string(parse);
        ret_cdr = parse_expr(parse);
        return create_pair(ret_car, ret_cdr);
    case '\'':
        parse->curr++;
        ret_car = parse_quote(parse);
        ret_cdr = parse_expr(parse);
        return create_pair(ret_car, ret_cdr);
    case ')':
        parse->curr++;
        return NIL;
    case '+': case '-': case 'b':
        ret_car = parse_number_or_symbol(parse);
        ret_cdr = parse_expr(parse);
        return create_pair(ret_car, ret_cdr);
    case '.':
        return parse_number_or_pair(parse);
    case '\\':
        parse->curr++;
        ret_car = create_char(*(parse->curr++));
        ret_cdr = parse_expr(parse);
        return create_pair(ret_car, ret_cdr);
    case ';':
        while(!is_newline(*parse->curr) && *parse->curr != '\0')
            parse->curr++;
        return parse_expr(parse);
    case 0:
        return NIL;
    default:
        if(is_number_char(*parse->curr))
        {
            ret_car = parse_number(parse);
            ret_cdr = parse_expr(parse);
            return create_pair(ret_car, ret_cdr);
        }
        else if(is_symbol_char(*parse->curr))
        {
            ret_car = parse_symbol(parse);
            ret_cdr = parse_expr(parse);
            return create_pair(ret_car, ret_cdr);
        }
        else
            return parser_error(parse, "Unexpected char in expression.");

    }
    parse->curr++;
}