simplekey.cpp

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#include "scanner.h"
#include "token.h"
#include "yaml-cpp-pm/exceptions.h"
#include "exp.h"
 
namespace YAML_PM
{
        Scanner::SimpleKey::SimpleKey(const Mark& mark_, int flowLevel_)
                : mark(mark_), flowLevel(flowLevel_), pIndent(0), pMapStart(0), pKey(0)
        {
        }
 
        void Scanner::SimpleKey::Validate()
        {
                // Note: pIndent will *not* be garbage here;
                //       we "garbage collect" them so we can
                //       always refer to them
                if(pIndent)
                        pIndent->status = IndentMarker::VALID;
                if(pMapStart)
                        pMapStart->status = Token::VALID;
                if(pKey)
                        pKey->status = Token::VALID;
        }
 
        void Scanner::SimpleKey::Invalidate()
        {
                if(pIndent)
                        pIndent->status = IndentMarker::INVALID;
                if(pMapStart)
                        pMapStart->status = Token::INVALID;
                if(pKey)
                        pKey->status = Token::INVALID;
        }
        
        // CanInsertPotentialSimpleKey
        bool Scanner::CanInsertPotentialSimpleKey() const
        {
                if(!m_simpleKeyAllowed)
                        return false;
 
                return !ExistsActiveSimpleKey();
        }
 
        // ExistsActiveSimpleKey
        // . Returns true if there's a potential simple key at our flow level
        //   (there's allowed at most one per flow level, i.e., at the start of the flow start token)
        bool Scanner::ExistsActiveSimpleKey() const
        {
                if(m_simpleKeys.empty())
                        return false;
                
                const SimpleKey& key = m_simpleKeys.top();
                return key.flowLevel == GetFlowLevel();
        }
 
        // InsertPotentialSimpleKey
        // . If we can, add a potential simple key to the queue,
        //   and save it on a stack.
        void Scanner::InsertPotentialSimpleKey()
        {
                if(!CanInsertPotentialSimpleKey())
                        return;
                
                SimpleKey key(INPUT.mark(), GetFlowLevel());
 
                // first add a map start, if necessary
                if(InBlockContext()) {
                        key.pIndent = PushIndentTo(INPUT.column(), IndentMarker::MAP);
                        if(key.pIndent) {
                                key.pIndent->status = IndentMarker::UNKNOWN;
                                key.pMapStart = key.pIndent->pStartToken;
                                key.pMapStart->status = Token::UNVERIFIED;
                        }
                }
 
                // then add the (now unverified) key
                m_tokens.push(Token(Token::KEY, INPUT.mark()));
                key.pKey = &m_tokens.back();
                key.pKey->status = Token::UNVERIFIED;
 
                m_simpleKeys.push(key);
        }
 
        // InvalidateSimpleKey
        // . Automatically invalidate the simple key in our flow level
        void Scanner::InvalidateSimpleKey()
        {
                if(m_simpleKeys.empty())
                        return;
                
                // grab top key
                SimpleKey& key = m_simpleKeys.top();
                if(key.flowLevel != GetFlowLevel())
                        return;
                
                key.Invalidate();
                m_simpleKeys.pop();
        }
 
        // VerifySimpleKey
        // . Determines whether the latest simple key to be added is valid,
        //   and if so, makes it valid.
        bool Scanner::VerifySimpleKey()
        {
                if(m_simpleKeys.empty())
                        return false;
 
                // grab top key
                SimpleKey key = m_simpleKeys.top();
 
                // only validate if we're in the correct flow level
                if(key.flowLevel != GetFlowLevel())
                        return false;
 
                m_simpleKeys.pop();
 
                bool isValid = true;
 
                // needs to be less than 1024 characters and inline
                if(INPUT.line() != key.mark.line || INPUT.pos() - key.mark.pos > 1024)
                        isValid = false;
 
                // invalidate key
                if(isValid)
                        key.Validate();
                else
                        key.Invalidate();
 
                return isValid;
        }
 
        void Scanner::PopAllSimpleKeys()
        {
                while(!m_simpleKeys.empty())
                        m_simpleKeys.pop();
        }
}