X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=blastalign.cpp;fp=blastalign.cpp;h=0a1350fac0c7fa655d5d04585156c28445c4d0d5;hb=526a868606faa50caf86e7399f7554c0335b39e5;hp=0000000000000000000000000000000000000000;hpb=c35f02a218ce8f430a75850b4d9fabb96b3a022b;p=mothur.git

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+/*
+ *  blastalign.cpp
+ *  
+ *
+ *  Created by Pat Schloss on 12/16/08.
+ *  Copyright 2008 Patrick D. Schloss. All rights reserved.
+ *
+ *	This is a basic alignment method that gets the blast program to do the heavy lifting.  In the future, we should
+ *	probably incorporate NCBI's library so that we don't have to call on a user-supplied executable.  This is a child
+ *	of the Alignment class, which requires a constructor and align method.
+ *
+ */
+
+using namespace std;
+
+#include "alignment.hpp"
+#include "blastalign.hpp"
+
+
+//**************************************************************************************************/
+
+BlastAlignment::BlastAlignment(float go, float ge, float m, float mm) : 
+			match(m),				//	This is the score to award for two nucleotides matching (match >= 0)
+			mismatch(mm)			//	This is the penalty to assess for a mismatch (mismatch <= 0)
+{
+	gapOpen = abs(go);				//	This is the penalty to assess for opening a gap (gapOpen >= 0)
+	gapExtend = abs(ge);				//	This is the penalty to assess for extending a gap (gapExtend >= 0)
+		
+	int randNumber = rand();
+	candidateFileName = toString(randNumber) + ".candidate";
+	templateFileName = toString(randNumber) + ".template";
+	blastFileName = toString(randNumber) + ".pairwise";
+}
+
+//**************************************************************************************************/
+
+BlastAlignment::~BlastAlignment(){		//	The desctructor should clean up by removing the temporary 
+	remove(candidateFileName.c_str());	//	files used to run bl2seq
+	remove(templateFileName.c_str());
+	remove(blastFileName.c_str());
+}
+
+//**************************************************************************************************/
+
+void BlastAlignment::align(string seqA, string seqB){	//Use blastn to align the two sequences
+
+	ofstream candidateFile(candidateFileName.c_str());	//	Write the sequence to be aligned to a temporary candidate seq file
+	candidateFile << ">candidate" << endl << seqA << endl;
+	candidateFile.close();
+	
+	ofstream templateFile(templateFileName.c_str());	//	Write the unaligned template sequence to a temporary candidate seq file
+	templateFile << ">template" << endl << seqB << endl;
+	templateFile.close();
+	
+	//	The blastCommand assumes that we have DNA sequences (blastn) and that they are fairly similar (-e 0.001) and
+	//	that we don't want to apply any kind of complexity filtering (-F F)
+	string blastCommand = "~/Pipeline/src/cpp/production/blast/bin/bl2seq -p blastn -i " + candidateFileName + " -j " + templateFileName + " -e 0.0001 -F F -o " + blastFileName + " -W 11";
+	blastCommand += " -r " + toString(match) + " -q " + toString(mismatch);
+	blastCommand +=	" -G " + toString(gapOpen) + " -E " + toString(gapExtend);
+	
+	system(blastCommand.c_str());	//	Here we assume that "bl2seq" is in the users path or in the same folder as
+									//	this executable
+	setPairwiseSeqs();
+}
+
+/**************************************************************************************************/
+
+void BlastAlignment::setPairwiseSeqs(){	//	This method call assigns the blast generated alignment
+															//	to the pairwise entry in the Sequence class for the 
+															//	candidate and template Sequence objects
+	ifstream blastFile;
+	openInputFile(blastFileName, blastFile);
+	
+	seqAaln = "";
+	seqBaln = "";
+	
+	int candidateLength, templateLength;
+	char d;
+	
+	string candidateName, templateName;
+	
+	while(d=blastFile.get() != '='){};
+	blastFile >> candidateName;					//	Get the candidate sequence name from flatfile
+	
+	while(d=blastFile.get() != '('){};
+	blastFile >> candidateLength;				//	Get the candidate sequence length from flatfile
+	
+	while(d=blastFile.get()){
+		if(d == '>'){
+			blastFile >> templateName;			//	Get the template sequence name from flatfile
+			break;
+		}
+		else if(d == '*'){									//	We go here if there is no significant match
+			
+			seqAstart = 0;
+			seqBstart = 0;
+			seqAend = 0;
+			seqBend = 0;
+			pairwiseLength = 0;
+			
+//			string dummy;
+//			while(dummy != "query:"){	cout << dummy << endl;blastFile >> dummy;	}
+//			blastFile >> seqBend;
+//			cout << seqBend << endl;
+//			for(int i=0;i<seqBend;i++){
+//				seqAaln += 'Z';
+//				seqBaln += 'X';
+//			}
+//			pairwiseLength = 0;
+			return;
+		}
+	}
+	
+	while(d=blastFile.get() != '='){};
+	blastFile >> templateLength;				//	Get the template sequence length from flatfile
+		
+	while(d=blastFile.get() != 'Q'){};			//	Suck up everything else until we get to the start of the alignment
+	int queryStart, sbjctStart, queryEnd, sbjctEnd;
+	string queryLabel, sbjctLabel, query, sbjct;
+
+	blastFile >> queryLabel;	queryLabel = 'Q' + queryLabel;
+
+	
+	while(queryLabel == "Query:"){
+		blastFile >> queryStart >> query >> queryEnd;
+		
+		while(d=blastFile.get() != 'S'){};
+		
+		blastFile >> sbjctLabel >> sbjctStart >> sbjct >> sbjctEnd;
+		
+		if(seqAaln == ""){
+			seqAstart = queryStart;
+			seqBstart = sbjctStart;
+		}
+
+		seqAaln += query;					//	concatenate each line of the sequence to what we already have
+		seqBaln += sbjct;					//	for the query and template (subject) sequence
+		
+		blastFile >> queryLabel;
+	}
+	seqAend = queryEnd;
+	seqBend = sbjctEnd;
+	pairwiseLength = seqAaln.length();
+
+	for(int i=1;i<seqBstart;i++){				//	Since the alignments don't always start at (1, 1), we need to pad
+		seqAaln = 'Z' + seqAaln;				//	the sequences so that they start at the same point
+		seqBaln = 'X' + seqBaln;
+	}
+	
+	for(int i=seqBend+1;i<=templateLength;i++){	//	since the sequences don't necessarily end at the same point, we
+		seqAaln += 'Z';							//	again need ot pad the sequences so that they extend to the length
+		seqBaln += 'X';							//	of the template sequence
+	}
+}
+
+//**************************************************************************************************/