[1875] | 1 | import re |
---|
| 2 | from asap._asap import selector as _selector, srctype |
---|
[1826] | 3 | from asap.utils import unique, _to_list |
---|
[948] | 4 | |
---|
[932] | 5 | class selector(_selector): |
---|
[948] | 6 | """ |
---|
| 7 | A selection object to be applied to scantables to restrict the |
---|
| 8 | scantables to specific rows. |
---|
| 9 | """ |
---|
[1930] | 10 | fields = ["pols", "ifs", "beams", "scans", "cycles", "name", "query", "types", "rows"] |
---|
[932] | 11 | |
---|
[1576] | 12 | def __init__(self, *args, **kw): |
---|
| 13 | if len(args) == 1: |
---|
| 14 | if isinstance(args[0], self.__class__) \ |
---|
| 15 | or isinstance(args[0], _selector): |
---|
| 16 | _selector.__init__(self, args[0]) |
---|
| 17 | else: |
---|
| 18 | raise TypeError("Argument can only be a selector object") |
---|
| 19 | else: |
---|
| 20 | _selector.__init__(self) |
---|
| 21 | for k,v in kw.items(): |
---|
| 22 | if k in self.fields: |
---|
| 23 | func = getattr(self, "set_%s" % k) |
---|
| 24 | func(v) |
---|
| 25 | |
---|
[932] | 26 | def reset(self): |
---|
| 27 | """ |
---|
| 28 | Unset all selections. |
---|
| 29 | """ |
---|
| 30 | self._reset() |
---|
| 31 | |
---|
[948] | 32 | def is_empty(self): |
---|
| 33 | """ |
---|
| 34 | Has anything been set? |
---|
| 35 | """ |
---|
| 36 | return self._empty() |
---|
| 37 | |
---|
[932] | 38 | def set_polarisations(self, pols=[]): |
---|
| 39 | """ |
---|
| 40 | Set the polarisations to be selected in the scantable. |
---|
| 41 | Parameters: |
---|
| 42 | pols: a list of integers of 0-3, or strings, e.g ["I","Q"]. |
---|
| 43 | Default [] is no selection |
---|
| 44 | Example: |
---|
| 45 | sel = selector() |
---|
| 46 | # These are equivalent if data is 'linear' |
---|
| 47 | sel.set_polarisations(["XX","Re(XY)"]) |
---|
| 48 | sel.set_polarisations([0,2]) |
---|
| 49 | # reset the polarisation selection |
---|
| 50 | sel.set_polarisations() |
---|
[948] | 51 | |
---|
[932] | 52 | """ |
---|
[954] | 53 | vec = _to_list(pols, str) or _to_list(pols, int) |
---|
[1045] | 54 | if isinstance(vec, list): # is an empty and/or valid vector |
---|
[932] | 55 | if len(vec) and isinstance(vec[-1],str): |
---|
[954] | 56 | self._setpolstrings(vec) |
---|
[932] | 57 | return |
---|
| 58 | self._setpols(vec) |
---|
| 59 | else: |
---|
| 60 | raise TypeError('Unknown pol type. Please use [0,1...] or ["XX","YY"...]') |
---|
[1576] | 61 | |
---|
[1349] | 62 | # for the americans |
---|
[1542] | 63 | set_polarizations = set_polarisations |
---|
| 64 | # for the lazy |
---|
| 65 | set_pols = set_polarisations |
---|
[932] | 66 | |
---|
| 67 | def set_ifs(self, ifs=[]): |
---|
| 68 | """ |
---|
| 69 | Set a sequence of IF numbers (0-based). |
---|
| 70 | Parameters: |
---|
| 71 | ifs: a list of integers. Default [] is to unset the selection. |
---|
| 72 | """ |
---|
| 73 | vec = _to_list(ifs, int) |
---|
[1045] | 74 | if isinstance(vec,list): |
---|
[932] | 75 | self._setifs(vec) |
---|
| 76 | else: |
---|
| 77 | raise TypeError('Unknown IFno type. Use lists of integers.') |
---|
| 78 | |
---|
| 79 | def set_scans(self, scans=[]): |
---|
| 80 | """ |
---|
| 81 | Set a sequence of Scan numbers (0-based). |
---|
| 82 | Parameters: |
---|
| 83 | scans: a list of integers. Default [] is to unset the selection. |
---|
| 84 | """ |
---|
| 85 | vec = _to_list(scans, int) |
---|
[1045] | 86 | if isinstance(vec,list): |
---|
[932] | 87 | self._setscans(vec) |
---|
| 88 | else: |
---|
| 89 | raise TypeError('Unknown Scan number type. Use lists of integers.') |
---|
| 90 | |
---|
| 91 | def set_beams(self, beams=[]): |
---|
| 92 | """ |
---|
| 93 | Set a sequence of Beam numbers (0-based). |
---|
| 94 | Parameters: |
---|
| 95 | beams: a list of integers. Default [] is to unset the selection. |
---|
| 96 | """ |
---|
| 97 | vec = _to_list(beams, int) |
---|
[1045] | 98 | if isinstance(vec,list): |
---|
[932] | 99 | self._setbeams(vec) |
---|
| 100 | else: |
---|
| 101 | raise TypeError('Unknown Beam number type. Use lists of integers.') |
---|
| 102 | |
---|
| 103 | def set_cycles(self, cycles=[]): |
---|
| 104 | """ |
---|
| 105 | Set a sequence of IF numbers (0-based). |
---|
| 106 | Parameters: |
---|
| 107 | cycless: a list of integers. Default [] is to unset the selection. |
---|
| 108 | """ |
---|
| 109 | vec = _to_list(cycles, int) |
---|
[1045] | 110 | if isinstance(vec,list): |
---|
[932] | 111 | self._setcycles(vec) |
---|
| 112 | else: |
---|
| 113 | raise TypeError('Unknown Cycle number type. Use lists of integers.') |
---|
| 114 | |
---|
[948] | 115 | |
---|
[932] | 116 | def set_name(self, name): |
---|
| 117 | """ |
---|
| 118 | Set a selection based on a name. This can be a unix pattern , e.g. "*_R" |
---|
| 119 | Parameters: |
---|
| 120 | name: a string containing a source name or pattern |
---|
| 121 | Examples: |
---|
| 122 | # select all reference scans which start with "Orion" |
---|
| 123 | selection.set_name("Orion*_R") |
---|
| 124 | """ |
---|
| 125 | if isinstance(name, str): |
---|
[952] | 126 | self._setname(name) |
---|
[932] | 127 | else: |
---|
| 128 | raise TypeError('name must be a string') |
---|
[948] | 129 | |
---|
[932] | 130 | def set_tsys(self, tsysmin=0.0, tsysmax=None): |
---|
| 131 | """ |
---|
| 132 | Select by Tsys range. |
---|
| 133 | Parameters: |
---|
| 134 | tsysmin: the lower threshold. Default 0.0 |
---|
| 135 | tsysmax: the upper threshold. Default None. |
---|
| 136 | Examples: |
---|
| 137 | # select all spectra with Tsys <= 500.0 |
---|
| 138 | selection.set_tsys(tsysmax=500.0) |
---|
[948] | 139 | |
---|
[932] | 140 | """ |
---|
[963] | 141 | taql = "SELECT FROM $1 WHERE TSYS[0] >= %f" % (tsysmin) |
---|
[932] | 142 | if isinstance(tsysmax, float): |
---|
[963] | 143 | taql = taql + " AND TSYS[0] <= %f" % ( tsysmax) |
---|
[932] | 144 | self._settaql(taql) |
---|
| 145 | |
---|
| 146 | def set_query(self, query): |
---|
| 147 | """ |
---|
| 148 | Select by Column query. Power users only! |
---|
| 149 | Example: |
---|
| 150 | # select all off scans with integration times over 60 seconds. |
---|
[1875] | 151 | selection.set_query("SRCTYPE == PSOFF AND INTERVAL > 60.0") |
---|
[932] | 152 | """ |
---|
[1875] | 153 | rx = re.compile("((SRCTYPE *[!=][=] *)([a-zA-Z.]+))", re.I) |
---|
| 154 | for r in rx.findall(query): |
---|
| 155 | sval = None |
---|
| 156 | stype = r[-1].lower() |
---|
| 157 | if stype.find('srctype.') == -1: |
---|
| 158 | stype = ".".join(["srctype", stype]) |
---|
| 159 | try: |
---|
| 160 | sval = eval(stype) |
---|
| 161 | sval = "%s%d" % (r[1], sval) |
---|
| 162 | except: |
---|
| 163 | continue |
---|
| 164 | query = query.replace(r[0], sval) |
---|
[932] | 165 | taql = "SELECT FROM $1 WHERE " + query |
---|
| 166 | self._settaql(taql) |
---|
[948] | 167 | |
---|
| 168 | def set_order(self, order): |
---|
| 169 | """ |
---|
| 170 | Set the order the scantable should be sorted by. |
---|
| 171 | Parameters: |
---|
[1045] | 172 | order: The list of column names to sort by in order |
---|
[948] | 173 | """ |
---|
| 174 | self._setorder(order) |
---|
| 175 | |
---|
[1819] | 176 | def set_rows(self, rows=[]): |
---|
| 177 | """ |
---|
| 178 | Set a sequence of row numbers (0-based). Power users Only! |
---|
| 179 | NOTICE row numbers can be changed easily by sorting, |
---|
[1826] | 180 | prior selection, etc. |
---|
[1819] | 181 | Parameters: |
---|
| 182 | rows: a list of integers. Default [] is to unset the selection. |
---|
| 183 | """ |
---|
[1826] | 184 | vec = _to_list(rows, int) |
---|
[1819] | 185 | if isinstance(vec,list): |
---|
| 186 | self._setrows(vec) |
---|
| 187 | else: |
---|
| 188 | raise TypeError('Unknown row number type. Use lists of integers.') |
---|
| 189 | |
---|
| 190 | def set_types(self, types=[]): |
---|
| 191 | """ |
---|
[1826] | 192 | Set a sequence of source types. |
---|
[1819] | 193 | Parameters: |
---|
| 194 | types: a list of integers. Default [] is to unset the selection. |
---|
| 195 | """ |
---|
[1826] | 196 | vec = _to_list(types, int) |
---|
[1819] | 197 | if isinstance(vec,list): |
---|
| 198 | self._settypes(vec) |
---|
| 199 | else: |
---|
| 200 | raise TypeError('Unknown row number type. Use lists of integers.') |
---|
| 201 | |
---|
[948] | 202 | def get_scans(self): |
---|
| 203 | return list(self._getscans()) |
---|
| 204 | def get_cycles(self): |
---|
| 205 | return list(self._getcycles()) |
---|
| 206 | def get_beams(self): |
---|
| 207 | return list(self._getbeams()) |
---|
| 208 | def get_ifs(self): |
---|
| 209 | return list(self._getifs()) |
---|
| 210 | def get_pols(self): |
---|
| 211 | return list(self._getpols()) |
---|
| 212 | def get_poltypes(self): |
---|
| 213 | return list(self._getpoltypes()) |
---|
| 214 | def get_order(self): |
---|
| 215 | return list(self._getorder()) |
---|
[1819] | 216 | def get_types(self): |
---|
| 217 | return list(self._gettypes()) |
---|
[1930] | 218 | def get_rows(self): |
---|
| 219 | return list(self._getrows()) |
---|
[1337] | 220 | def get_query(self): |
---|
| 221 | prefix = "SELECT FROM $1 WHERE " |
---|
| 222 | return self._gettaql().replace(prefix, "") |
---|
[1542] | 223 | |
---|
[948] | 224 | def get_name(self): |
---|
| 225 | print "NYI" |
---|
| 226 | s = self._gettaql() |
---|
[1337] | 227 | return |
---|
| 228 | def __str__(self): |
---|
| 229 | out = "" |
---|
| 230 | d = {"SCANNO": self.get_scans(), |
---|
| 231 | "CYCLENO": self.get_cycles(), |
---|
| 232 | "BEAMNO": self.get_beams(), |
---|
| 233 | "IFNO": self.get_ifs(), |
---|
| 234 | "Pol Type": self.get_poltypes(), |
---|
| 235 | "POLNO": self.get_pols(), |
---|
| 236 | "QUERY": self.get_query(), |
---|
[1930] | 237 | "SRCTYPE": self.get_types(), |
---|
| 238 | "ROWS": self.get_rows(), |
---|
[1337] | 239 | "Sort Order": self.get_order() |
---|
| 240 | } |
---|
| 241 | for k,v in d.iteritems(): |
---|
| 242 | if v: |
---|
| 243 | out += "%s: %s\n" % (k, v) |
---|
| 244 | if len(out): |
---|
| 245 | return out[:-1] |
---|
| 246 | else: |
---|
| 247 | return out |
---|
[948] | 248 | def __add__(self, other): |
---|
| 249 | """ |
---|
| 250 | Merge two selections. |
---|
| 251 | """ |
---|
[1596] | 252 | if self.is_empty(): |
---|
| 253 | return other |
---|
| 254 | elif other.is_empty(): |
---|
| 255 | return self |
---|
[948] | 256 | union = selector() |
---|
| 257 | gets = [[self._getscans(), other._getscans(), union._setscans], |
---|
| 258 | [self._getcycles(), other._getcycles(),union._setcycles], |
---|
| 259 | [self._getbeams(), other._getbeams(), union._setbeams], |
---|
| 260 | [self._getifs(), other._getifs(), union._setifs], |
---|
| 261 | [self._getpols(), other._getpols(), union._setpols]] |
---|
| 262 | for v in gets: |
---|
| 263 | vec = list(v[0]+v[1]) |
---|
| 264 | vec.sort() |
---|
| 265 | v[2](unique(vec)) |
---|
[1349] | 266 | q = other.get_query() |
---|
| 267 | qs = self.get_query() |
---|
| 268 | if len(q) and len(qs): |
---|
| 269 | union.set_query(qs +" AND " + q) |
---|
| 270 | else: |
---|
| 271 | if len(q): |
---|
| 272 | union.set_query(q) |
---|
| 273 | elif len(qs): |
---|
| 274 | union.set_query(qs) |
---|
[948] | 275 | return union |
---|