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#ifndef SCANNER_H_62B23520_7C8E_11DE_8A39_0800200C9A66
#define SCANNER_H_62B23520_7C8E_11DE_8A39_0800200C9A66
#if defined(_MSC_VER) || (defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || (__GNUC__ >= 4)) // GCC supports "pragma once" correctly since 3.4
#pragma once
#endif
#include <ios>
#include <string>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include "ptr_vector.h"
#include "stream.h"
#include "token.h"
namespace LHAPDF_YAML
{
class Node;
class RegEx;
class Scanner
{
public:
Scanner(std::istream& in);
~Scanner();
// token queue management (hopefully this looks kinda stl-ish)
bool empty();
void pop();
Token& peek();
private:
struct IndentMarker {
enum INDENT_TYPE { MAP, SEQ, NONE };
enum STATUS { VALID, INVALID, UNKNOWN };
IndentMarker(int column_, INDENT_TYPE type_): column(column_), type(type_), status(VALID), pStartToken(0) {}
int column;
INDENT_TYPE type;
STATUS status;
Token *pStartToken;
};
enum FLOW_MARKER { FLOW_MAP, FLOW_SEQ };
private:
// scanning
void EnsureTokensInQueue();
void ScanNextToken();
void ScanToNextToken();
void StartStream();
void EndStream();
Token *PushToken(Token::TYPE type);
bool InFlowContext() const { return !m_flows.empty(); }
bool InBlockContext() const { return m_flows.empty(); }
int GetFlowLevel() const { return m_flows.size(); }
Token::TYPE GetStartTokenFor(IndentMarker::INDENT_TYPE type) const;
IndentMarker *PushIndentTo(int column, IndentMarker::INDENT_TYPE type);
void PopIndentToHere();
void PopAllIndents();
void PopIndent();
int GetTopIndent() const;
// checking input
bool CanInsertPotentialSimpleKey() const;
bool ExistsActiveSimpleKey() const;
void InsertPotentialSimpleKey();
void InvalidateSimpleKey();
bool VerifySimpleKey();
void PopAllSimpleKeys();
void ThrowParserException(const std::string& msg) const;
bool IsWhitespaceToBeEaten(char ch);
const RegEx& GetValueRegex() const;
struct SimpleKey {
SimpleKey(const Mark& mark_, int flowLevel_);
void Validate();
void Invalidate();
Mark mark;
int flowLevel;
IndentMarker *pIndent;
Token *pMapStart, *pKey;
};
// and the tokens
void ScanDirective();
void ScanDocStart();
void ScanDocEnd();
void ScanBlockSeqStart();
void ScanBlockMapSTart();
void ScanBlockEnd();
void ScanBlockEntry();
void ScanFlowStart();
void ScanFlowEnd();
void ScanFlowEntry();
void ScanKey();
void ScanValue();
void ScanAnchorOrAlias();
void ScanTag();
void ScanPlainScalar();
void ScanQuotedScalar();
void ScanBlockScalar();
private:
// the stream
Stream INPUT;
// the output (tokens)
std::queue<Token> m_tokens;
// state info
bool m_startedStream, m_endedStream;
bool m_simpleKeyAllowed;
bool m_canBeJSONFlow;
std::stack<SimpleKey> m_simpleKeys;
std::stack<IndentMarker *> m_indents;
ptr_vector<IndentMarker> m_indentRefs; // for "garbage collection"
std::stack<FLOW_MARKER> m_flows;
};
}
#endif // SCANNER_H_62B23520_7C8E_11DE_8A39_0800200C9A66

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