| 1 | """
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| 2 | A representation of a spectral line catalog.
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| 3 |
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| 4 | Author: Malte Marquarding
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| 5 |
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| 6 | """
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| 7 | __revision__ = "$Revision: 1534 $"
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| 8 | from asap._asap import linecatalog as lcbase
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| 9 | from asap import rcParams
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| 10 | import os
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| 11 |
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| 12 | class linecatalog(lcbase):
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| 13 | """
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| 14 | This class is a warpper for line catalogs. These can be either ASCII tables
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| 15 | or the tables saved from this class.
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| 16 | ASCII tables have the following restrictions:
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| 17 | Comments can be present through lines starting with '#'.
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| 18 | The first column contains the name of the Molecule. This can't contain spaces,
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| 19 | if it does it has to be wrapped in ""
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| 20 | The second column contains the frequency of the transition.
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| 21 | The third column contains the error in frequency.
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| 22 | The fourth column contains a value describing the intensity
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| 23 | """
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| 24 |
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| 25 | def __init__(self, name):
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| 26 | fpath = os.path.abspath(os.path.expandvars(os.path.expanduser(name)))
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| 27 | if os.path.exists(fpath):
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| 28 | lcbase.__init__(self, fpath)
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| 29 | else:
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| 30 | msg = "File '%s' not found" % fpath
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| 31 | if rcParams['verbose']:
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| 32 | print msg
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| 33 | return
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| 34 | else:
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| 35 | raise IOError(msg)
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| 36 |
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| 37 | def __repr__(self):
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| 38 | return lcbase.summary(self, -1)
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| 39 |
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| 40 | def summary(self):
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| 41 | """
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| 42 | Print the contents of the table.
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| 43 | """
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| 44 | try:
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| 45 | from IPython.genutils import page as pager
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| 46 | except ImportError:
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| 47 | from pydoc import pager
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| 48 | pager(lcbase.summary(self, -1))
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| 49 |
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| 50 | def set_name(self, name, mode="pattern"):
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| 51 | """
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| 52 | Set a name restriction on the table. This can be a standard unix-style
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| 53 | pattern or a regular expression.
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| 54 | Parameters:
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| 55 | name: the name patterrn/regex
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| 56 | mode: the matching mode, i.e. "pattern" (default) or "regex"
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| 57 | """
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| 58 | validmodes = "pattern regex".split()
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| 59 | if not mode.lower() in validmodes:
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| 60 | return
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| 61 | lcbase.set_name(self, name, mode)
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| 62 |
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| 63 | def set_frequency_limits(self, fmin=1.0, fmax=120.0, unit="GHz"):
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| 64 | """
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| 65 | Set frequency limits on the table.
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| 66 | Parameters:
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| 67 | fmin: the lower bound
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| 68 | fmax: the upper bound
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| 69 | unit: the frequency unit (default "GHz")
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| 70 |
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| 71 | Note:
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| 72 | The underlying table conatins frequency values in MHz
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| 73 | """
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| 74 | base = { "GHz": 1000.0, "MHz": 1.0 }
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| 75 | if not base.has_key(unit):
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| 76 | raise ValueError("%s is not a valid unit." % unit)
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| 77 | # the table conatins values in MHz
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| 78 | lcbase.set_frequency_limits(self, fmin*base[unit], fmax*base[unit])
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| 79 |
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| 80 | def set_strength_limits(self, smin, smax):
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| 81 | """
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| 82 | Set line strength limits on the table (arbitrary units)
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| 83 | Parameters:
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| 84 | smin: the lower bound
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| 85 | smax: the upper bound
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| 86 | """
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| 87 | lcbase.set_strength_limits(self, smin, smax)
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| 88 |
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| 89 | def save(self, name, overwrite=False):
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| 90 | """
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| 91 | Save the subset of the table to disk. This uses an internal data format
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| 92 | and can be read in again.
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| 93 | """
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| 94 | name = os.path.expanduser(os.path.expandvars(name))
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| 95 | if os.path.isfile(name) or os.path.isdir(name):
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| 96 | if not overwrite:
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| 97 | msg = "File %s exists." % name
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| 98 | if rcParams['verbose']:
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| 99 | print msg
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| 100 | return
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| 101 | else:
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| 102 | raise IOError(msg)
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| 103 | lcbase.save(self, name)
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| 104 |
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| 105 | def reset(self):
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| 106 | """
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| 107 | Reset the table to its initial state, i.e. undo all calls to set_
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| 108 | """
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| 109 | lcbase.reset(self)
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| 110 |
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| 111 | def get_row(self, row=0):
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| 112 | """
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| 113 | Get the values in a specified row of the table.
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| 114 | Parameters:
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| 115 | row: the row to retrieve
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| 116 | """
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| 117 | freq = lcbase.get_frequency(self, row)
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| 118 | name = lcbase.get_name(self, row)
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| 119 | return { 'name':name, 'value': freq }
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| 120 |
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| 121 | def __len__(self):
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| 122 | return self.nrow()
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| 123 |
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| 124 | def __getitem__(self, k):
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| 125 | if k < 0: k = self.nrow()-k
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| 126 | return self.get_row(k)
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| 127 |
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| 128 |
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| 129 |
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| 130 |
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| 131 |
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