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#include "PCNTools.h"
#include <iostream>
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"; return CNAlt(); } // throw "expected (";
std::string word = getEscapedString(in,c);
if (get(in,c++) != ',') { std::cerr << "PCN/PLF parse error: expected , after string\n"; return CNAlt(); } // throw "expected , after string";
size_t cnNext = 1;
float prob = getFloat(in,c);
if (get(in,c) == ',') { // WORD LATTICE
c++;
int colIncr = getInt(in,c);
if (colIncr < 1) { colIncr = 1; //WARN
}
cnNext = (size_t)colIncr;
}
if (get(in,c++) != ')') { std::cerr << "PCN/PLF parse error: expected ) at end of cn alt block\n"; return CNAlt(); } // throw "expected )";
eatws(in,c);
return CNAlt(std::pair<std::string, float>(word,prob), 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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