1 | """ |
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2 | Converts any type of FASTQ file to Sanger type and makes small adjustments if necessary. |
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3 | |
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4 | usage: %prog [options] |
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5 | -i, --input=i: Input FASTQ candidate file |
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6 | -r, --origType=r: Original type |
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7 | -a, --allOrNot=a: Whether or not to check all blocks |
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8 | -b, --blocks=b: Number of blocks to check |
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9 | -o, --output=o: Output file |
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10 | |
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11 | usage: %prog input_file oroutput_file |
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12 | """ |
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13 | |
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14 | import math, sys |
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15 | from galaxy import eggs |
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16 | import pkg_resources; pkg_resources.require( "bx-python" ) |
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17 | from bx.cookbook import doc_optparse |
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18 | |
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19 | def stop_err( msg ): |
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20 | sys.stderr.write( "%s\n" % msg ) |
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21 | sys.exit() |
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22 | |
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23 | def all_bases_valid(seq): |
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24 | """Confirm that the sequence contains only bases""" |
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25 | valid_bases = ['a', 'A', 'c', 'C', 'g', 'G', 't', 'T', 'N'] |
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26 | for base in seq: |
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27 | if base not in valid_bases: |
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28 | return False |
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29 | return True |
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30 | |
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31 | def __main__(): |
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32 | #Parse Command Line |
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33 | options, args = doc_optparse.parse( __doc__ ) |
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34 | orig_type = options.origType |
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35 | if orig_type == 'sanger' and options.allOrNot == 'not': |
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36 | max_blocks = int(options.blocks) |
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37 | else: |
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38 | max_blocks = -1 |
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39 | fin = file(options.input, 'r') |
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40 | fout = file(options.output, 'w') |
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41 | range_min = 1000 |
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42 | range_max = -5 |
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43 | block_num = 0 |
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44 | bad_blocks = 0 |
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45 | base_len = -1 |
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46 | line_count = 0 |
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47 | lines = [] |
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48 | line = fin.readline() |
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49 | while line: |
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50 | if line.strip() and max_blocks >= 0 and block_num > 0 and orig_type == 'sanger' and block_num >= max_blocks: |
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51 | fout.write(line) |
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52 | if line_count % 4 == 0: |
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53 | block_num += 1 |
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54 | line_count += 1 |
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55 | elif line.strip(): |
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56 | # the line that starts a block, with a name |
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57 | if line_count % 4 == 0 and line.startswith('@'): |
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58 | lines.append(line) |
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59 | else: |
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60 | # if we expect a sequence of bases |
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61 | if line_count % 4 == 1 and all_bases_valid(line.strip()): |
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62 | lines.append(line) |
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63 | base_len = len(line.strip()) |
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64 | # if we expect the second name line |
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65 | elif line_count % 4 == 2 and line.startswith('+'): |
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66 | lines.append(line) |
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67 | # if we expect a sequence of qualities and it's the expected length |
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68 | elif line_count % 4 == 3: |
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69 | split_line = line.strip().split() |
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70 | # decimal qualities |
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71 | if len(split_line) == base_len: |
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72 | # convert |
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73 | phred_list = [] |
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74 | for ch in split_line: |
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75 | int_ch = int(ch) |
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76 | if int_ch < range_min: |
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77 | range_min = int_ch |
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78 | if int_ch > range_max: |
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79 | range_max = int_ch |
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80 | if int_ch >= 0 and int_ch <= 93: |
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81 | phred_list.append(chr(int_ch + 33)) |
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82 | # make sure we haven't lost any quality values |
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83 | if len(phred_list) == base_len: |
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84 | # print first three lines |
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85 | for l in lines: |
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86 | fout.write(l) |
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87 | # print converted quality line |
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88 | fout.write(''.join(phred_list)) |
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89 | # reset |
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90 | lines = [] |
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91 | base_len = -1 |
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92 | # abort if so |
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93 | else: |
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94 | bad_blocks += 1 |
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95 | lines = [] |
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96 | base_len = -1 |
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97 | # ascii qualities |
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98 | elif len(split_line[0]) == base_len: |
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99 | qualities = [] |
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100 | # print converted quality line |
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101 | if orig_type == 'illumina': |
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102 | for c in line.strip(): |
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103 | if ord(c) - 64 < range_min: |
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104 | range_min = ord(c) - 64 |
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105 | if ord(c) - 64 > range_max: |
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106 | range_max = ord(c) - 64 |
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107 | if ord(c) < 64 or ord(c) > 126: |
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108 | bad_blocks += 1 |
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109 | base_len = -1 |
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110 | lines = [] |
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111 | break |
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112 | else: |
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113 | qualities.append( chr( ord(c) - 31 ) ) |
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114 | quals = ''.join(qualities) |
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115 | elif orig_type == 'solexa': |
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116 | for c in line.strip(): |
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117 | if ord(c) - 64 < range_min: |
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118 | range_min = ord(c) - 64 |
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119 | if ord(c) - 64 > range_max: |
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120 | range_max = ord(c) - 64 |
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121 | if ord(c) < 59 or ord(c) > 126: |
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122 | bad_blocks += 1 |
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123 | base_len = -1 |
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124 | lines = [] |
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125 | break |
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126 | else: |
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127 | p = 10.0**( ( ord(c) - 64 ) / -10.0 ) / ( 1 + 10.0**( ( ord(c) - 64 ) / -10.0 ) ) |
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128 | qualities.append( chr( int( -10.0*math.log10( p ) ) + 33 ) ) |
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129 | quals = ''.join(qualities) |
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130 | else: # 'sanger' |
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131 | for c in line.strip(): |
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132 | if ord(c) - 33 < range_min: |
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133 | range_min = ord(c) - 33 |
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134 | if ord(c) - 33 > range_max: |
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135 | range_max = ord(c) - 33 |
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136 | if ord(c) < 33 or ord(c) > 126: |
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137 | bad_blocks += 1 |
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138 | base_len = -1 |
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139 | lines = [] |
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140 | break |
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141 | else: |
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142 | qualities.append(c) |
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143 | quals = ''.join(qualities) |
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144 | # make sure we don't have bad qualities |
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145 | if len(quals) == base_len: |
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146 | # print first three lines |
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147 | for l in lines: |
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148 | fout.write(l) |
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149 | # print out quality line |
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150 | fout.write(quals+'\n') |
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151 | # reset |
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152 | lines = [] |
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153 | base_len = -1 |
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154 | else: |
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155 | bad_blocks += 1 |
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156 | base_len = -1 |
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157 | lines = [] |
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158 | # mark the successful end of a block |
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159 | block_num += 1 |
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160 | line_count += 1 |
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161 | line = fin.readline() |
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162 | fout.close() |
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163 | fin.close() |
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164 | if range_min != 1000 and range_min != -5: |
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165 | outmsg = 'The range of quality values found were: %s to %s' % (range_min, range_max) |
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166 | else: |
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167 | outmsg = '' |
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168 | if bad_blocks > 0: |
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169 | outmsg += '\nThere were %s bad blocks skipped' % (bad_blocks) |
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170 | sys.stdout.write(outmsg) |
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171 | |
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172 | if __name__=="__main__": __main__() |
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