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#include <cstring>
#include <sstream>
#include <cstdarg>
#include "Parser.h"
using std::getline;
ParserException::ParserException(const char * fmt, ...) {
va_list args;
va_start(args, fmt);
size_t sz = vsnprintf(NULL, 0, fmt, args) + 1;
if (error != NULL) free(error);
error = (char *) malloc(sz);
vsnprintf(error, sz, fmt, args);
va_end(args);
}
ParserException::~ParserException() {
if (error != NULL)
free(error);
}
const char * ParserException::what() {
return error;
}
size_t Parser::filter(char * input) {
size_t
len = strlen(input),
offset = 0,
i = 0;
while (i < len) {
if(input[i] == '#') {
offset += len - i;
break;
}
size_t skip = strspn(input + i, " \t\n");
if (skip > 0) {
offset += skip;
i += skip;
continue;
}
input[i - offset] = input[i];
i++;
}
input[len - offset] = '\0';
return len - offset;
}
void Parser::set_circuit(Circuit & circuit) {
this->circuit = &circuit;
}
void Parser::parse(istream & input) {
unsigned linenum = 0;
string line_str;
while (getline(input, line_str)) {
linenum++;
char* line = line_str.data();
size_t len = Parser::filter(line);
if (len == 0) continue; // ignore empty lines
char* label = strtok(line, ":");
if (label == NULL) throw ParserException("syntax error on line %u", linenum);
char* content = strtok(NULL, ";");
if (content == NULL) throw ParserException("syntax error on line %u", linenum);
vector<string> nodes;
while ((content = strtok(content, ",")) != NULL) {
nodes.push_back(content);
content = NULL;
}
if (circuit == nullptr) throw ParserException("circuit is not initialized!");
circuit->create(label, nodes);
}
}
istream & operator >> (istream & s, Parser & parser) {
parser.parse(s);
return s;
}
istream & operator << (Parser & parser, istream & s) {
parser.parse(s);
return s;
}
void Parser::parse(string input) {
std::istringstream s(input);
parse(s);
}
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