diff tools/blast2go/massage_xml_for_blast2go.py @ 8:e23b621eb7bb draft

Uploaded v0.0.9, embed citation, updated README

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/blast2go/massage_xml_for_blast2go.py	Thu Mar 26 11:15:22 2015 -0400
@@ -0,0 +1,92 @@
+#!/usr/bin/env python
+"""Script for reformatting Blast XML to suit Blast2GO.
+
+This script takes exactly two command line arguments:
+ * Input BLAST XML filename
+ * Output BLAST XML filename
+
+Sadly b2g4pipe (at least v2.3.5 to v2.5.0) cannot cope with current
+style large BLAST XML files (e.g. from BLAST 2.2.25+), so we reformat
+these to avoid it crashing with a Java heap space OutOfMemoryError.
+
+As part of this reformatting, we check for BLASTP or BLASTX output
+(otherwise raise an error), and print the query count.
+
+This script is called from my Galaxy wrapper for Blast2GO for pipelines,
+available from the Galaxy Tool Shed here:
+http://toolshed.g2.bx.psu.edu/view/peterjc/blast2go 
+
+This script is under version control here:
+https://github.com/peterjc/galaxy_blast/tree/master/blast2go
+"""
+import sys
+import os
+import subprocess
+
+def stop_err(msg, error_level=1):
+    """Print error message to stdout and quit with given error level."""
+    sys.stderr.write("%s\n" % msg)
+    sys.exit(error_level)
+
+def prepare_xml(original_xml, mangled_xml):
+    """Reformat BLAST XML to suit Blast2GO.
+
+    Blast2GO can't cope with 1000s of <Iteration> tags within a
+    single <BlastResult> tag, so instead split this into one
+    full XML record per interation (i.e. per query). This gives
+    a concatenated XML file mimicing old versions of BLAST.
+
+    This also checks for BLASTP or BLASTX output, and outputs
+    the number of queries. Galaxy will show this as "info".
+    """
+    in_handle = open(original_xml)
+    footer = "  </BlastOutput_iterations>\n</BlastOutput>\n"
+    header = ""
+    while True:
+        line = in_handle.readline()
+        if not line:
+            #No hits?
+            stop_err("Problem with XML file?")
+        if line.strip() == "<Iteration>":
+            break
+        header += line
+
+    if "<BlastOutput_program>blastx</BlastOutput_program>" in header:
+        print "BLASTX output identified"
+    elif "<BlastOutput_program>blastp</BlastOutput_program>" in header:
+        print "BLASTP output identified"
+    else:
+        in_handle.close()
+        stop_err("Expect BLASTP or BLASTX output")
+
+    out_handle = open(mangled_xml, "w")
+    out_handle.write(header)
+    out_handle.write(line)
+    count = 1
+    while True:
+        line = in_handle.readline()
+        if not line:
+            break
+        elif line.strip() == "<Iteration>":
+           #Insert footer/header
+           out_handle.write(footer)
+           out_handle.write(header)
+           count += 1
+        out_handle.write(line)
+
+    out_handle.close()
+    in_handle.close()
+    print "Input has %i queries" % count
+
+
+if __name__ == "__main__":
+    # Run the conversion...
+    if len(sys.argv) != 3:
+        stop_err("Require two arguments: XML input filename, XML output filename")
+
+    xml_file, out_xml_file = sys.argv[1:]
+
+    if not os.path.isfile(xml_file):
+        stop_err("Input BLAST XML file not found: %s" % xml_file)
+
+    prepare_xml(xml_file, out_xml_file)