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#include "simple_parser.h"
#include <cctype>
#include <sstream>
SimpleParser::SimpleParser(std::istream *i) {
in_ = i;
}
bool SimpleParser::Expect(std::string s) {
SwallowWhitespace();
if (s.size() == 0) {
return true;
}
std::string swallowed;
char c;
in_->get(c);
swallowed += c;
while ((*in_) && swallowed.size() < s.size() && swallowed == s.substr(0, swallowed.size())) {
in_->get(c);
swallowed += c;
}
if (swallowed == s) {
return true;
}
else {
std::string::reverse_iterator it;
for (it = swallowed.rbegin(); it != swallowed.rend(); ++it) {
in_->putback(*it);
}
return false;
}
}
bool SimpleParser::Peek(std::string s) {
SwallowWhitespace();
bool retval = false;
if (s.size() == 0) {
return true;
}
std::string swallowed;
char c;
in_->get(c);
swallowed += c;
while ((*in_) && swallowed.size() < s.size() && swallowed == s.substr(0, swallowed.size())) {
in_->get(c);
swallowed += c;
}
if (swallowed == s) {
retval = true;
}
else {
retval = false;
}
std::string::reverse_iterator it;
for (it = swallowed.rbegin(); it != swallowed.rend(); ++it) {
in_->putback(*it);
}
return retval;
}
void SimpleParser::SwallowWhitespace() {
char c;
in_->get(c);
while ((*in_) && std::isspace(c)) {
in_->get(c);
}
in_->putback(c);
}
void SimpleParser::SwallowLine() {
std::string placeholder;
std::getline(*in_, placeholder);
SwallowWhitespace();
}
bool SimpleParser::ReadFloat(float &f) {
SwallowWhitespace();
std::string accum;
char c;
in_->get(c);
while ((*in_) && FloatChar(c)) {
accum += c;
in_->get(c);
}
in_->putback(c);
std::stringstream ss(accum);
ss >> f;
return true;
}
bool SimpleParser::ReadInt(int &i) {
SwallowWhitespace();
std::string accum;
char c;
in_->get(c);
while ((*in_) && IntChar(c)) {
accum += c;
in_->get(c);
}
in_->putback(c);
std::stringstream ss(accum);
ss >> i;
return true;
}
bool SimpleParser::ReadToken(std::string &s) {
SwallowWhitespace();
std::string accum;
char c;
in_->get(c);
while ((*in_) && TokenChar(c)) {
accum += c;
in_->get(c);
}
in_->putback(c);
s = accum;
return true;
}
bool SimpleParser::Good() {
return (*in_).good();
}
bool SimpleParser::ReadLine(std::string &line) {
getline(*in_, line);
return true;
}
bool SimpleParser::UpcomingInt() {
SwallowWhitespace();
char c;
in_->get(c);
in_->putback(c);
return IntChar(c);
}
bool SimpleParser::FloatChar(char c) {
return ( c == 'e'
|| (c >= '0' && c <= '9')
|| c == '.'
|| c == '+'
|| c == '-'
);
}
bool SimpleParser::IntChar(char c) {
return ( (c >= '0' && c <= '9') || c == '-');
}
bool SimpleParser::TokenChar(char c) {
return !std::isspace(c);
}
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