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#include "PCNTools.h"
#include <iostream>
#include <cstdlib>
namespace PCN
{
const std::string chars = "'\\";
const char& quote = chars[0];
const char& slash = chars[1];
// safe get
inline char get(const std::string& in, int c)
{
if (c < 0 || c >= (int)in.size()) return 0;
else return in[(size_t)c];
}
// consume whitespace
inline void eatws(const std::string& in, int& c)
{
while (get(in,c) == ' ') {
c++;
}
}
// from 'foo' return foo
std::string getEscapedString(const std::string& in, int &c)
{
eatws(in,c);
if (get(in,c++) != quote) return "ERROR";
std::string res;
char cur = 0;
do {
cur = get(in,c++);
if (cur == slash) {
res += get(in,c++);
} else if (cur != quote) {
res += cur;
}
} while (get(in,c) != quote && (c < (int)in.size()));
c++;
eatws(in,c);
return res;
}
// basically atof
float getFloat(const std::string& in, int &c)
{
std::string tmp;
eatws(in,c);
while (c < (int)in.size() && get(in,c) != ' ' && get(in,c) != ')' && get(in,c) != ',') {
tmp += get(in,c++);
}
eatws(in,c);
return atof(tmp.c_str());
}
// basically atof
int getInt(const std::string& in, int &c)
{
std::string tmp;
eatws(in,c);
while (c < (int)in.size() && get(in,c) != ' ' && get(in,c) != ')' && get(in,c) != ',') {
tmp += get(in,c++);
}
eatws(in,c);
return atoi(tmp.c_str());
}
// parse ('foo', 0.23)
CNAlt getCNAlt(const std::string& in, int &c)
{
if (get(in,c++) != '(') {
std::cerr << "PCN/PLF parse error: expected ( at start of cn alt block\n"; // throw "expected (";
return CNAlt();
}
std::string word = getEscapedString(in,c);
if (get(in,c++) != ',') {
std::cerr << "PCN/PLF parse error: expected , after string\n"; // throw "expected , after string";
return CNAlt();
}
size_t cnNext = 1;
std::vector<float> probs;
probs.push_back(getFloat(in,c));
while (get(in,c) == ',') {
c++;
float val = getFloat(in,c);
probs.push_back(val);
}
//if we read more than one prob, this was a lattice, last item was column increment
if (probs.size()>1) {
cnNext = static_cast<size_t>(probs.back());
probs.pop_back();
if (cnNext < 1) {
; //throw "bad link length"
std::cerr << "PCN/PLF parse error: bad link length at last element of cn alt block\n";
return CNAlt();
}
}
if (get(in,c++) != ')') {
std::cerr << "PCN/PLF parse error: expected ) at end of cn alt block\n"; // throw "expected )";
return CNAlt();
}
eatws(in,c);
return CNAlt(std::pair<std::string, std::vector<float> >(word,probs), cnNext);
}
// parse (('foo', 0.23), ('bar', 0.77))
CNCol getCNCol(const std::string& in, int &c)
{
CNCol res;
if (get(in,c++) != '(') return res; // error
eatws(in,c);
while (1) {
if (c > (int)in.size()) {
break;
}
if (get(in,c) == ')') {
c++;
eatws(in,c);
break;
}
if (get(in,c) == ',' && get(in,c+1) == ')') {
c+=2;
eatws(in,c);
break;
}
if (get(in,c) == ',') {
c++;
eatws(in,c);
}
res.push_back(getCNAlt(in, c));
}
return res;
}
// parse ((('foo', 0.23), ('bar', 0.77)), (('a', 0.3), ('c', 0.7)))
CN parsePCN(const std::string& in)
{
CN res;
int c = 0;
if (in[c++] != '(') return res; // error
while (1) {
if (c > (int)in.size()) {
break;
}
if (get(in,c) == ')') {
c++;
eatws(in,c);
break;
}
if (get(in,c) == ',' && get(in,c+1) == ')') {
c+=2;
eatws(in,c);
break;
}
if (get(in,c) == ',') {
c++;
eatws(in,c);
}
res.push_back(getCNCol(in, c));
}
return res;
}
}
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