scantag.cpp

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#include "scanner.h"
#include "regex.h"
#include "exp.h"
#include "yaml-cpp-pm/exceptions.h"

namespace YAML_PM
{
        const std::string ScanVerbatimTag(Stream& INPUT)
        {
                std::string tag;
                
                // eat the start character
                INPUT.get();
                
                while(INPUT) {
                        if(INPUT.peek() == Keys::VerbatimTagEnd) {
                                // eat the end character
                                INPUT.get();
                                return tag;
                        }
                
                        int n = Exp::URI().Match(INPUT);
                        if(n <= 0)
                                break;
                        
                        tag += INPUT.get(n);
                }

                throw ParserException(INPUT.mark(), ErrorMsg::END_OF_VERBATIM_TAG);
        }
        
        const std::string ScanTagHandle(Stream& INPUT, bool& canBeHandle)
        {
                std::string tag;
                canBeHandle = true;
                Mark firstNonWordChar;
                
                while(INPUT) {
                        if(INPUT.peek() == Keys::Tag) {
                                if(!canBeHandle)
                                        throw ParserException(firstNonWordChar, ErrorMsg::CHAR_IN_TAG_HANDLE);
                                break;
                        }

                        int n = 0;
                        if(canBeHandle) {
                                n = Exp::Word().Match(INPUT);
                                if(n <= 0) {
                                        canBeHandle = false;
                                        firstNonWordChar = INPUT.mark();
                                }
                        }
                        
                        if(!canBeHandle)
                                n = Exp::Tag().Match(INPUT);

                        if(n <= 0)
                                break;
                        
                        tag += INPUT.get(n);
                }

                return tag;
        }
        
        const std::string ScanTagSuffix(Stream& INPUT)
        {
                std::string tag;
                
                while(INPUT) {
                        int n = Exp::Tag().Match(INPUT);
                        if(n <= 0)
                                break;
                        
                        tag += INPUT.get(n);
                }
                
                if(tag.empty())
                        throw ParserException(INPUT.mark(), ErrorMsg::TAG_WITH_NO_SUFFIX);
                
                return tag;
        }
}