1 | #! /usr/bin/env python |
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2 | # -*- coding: ISO-8859-15 -*- |
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3 | # |
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4 | # pkpgcounter : a generic Page Description Language parser |
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5 | # |
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6 | # (c) 2003, 2004, 2005, 2006 Jerome Alet <alet@librelogiciel.com> |
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7 | # This program is free software; you can redistribute it and/or modify |
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8 | # it under the terms of the GNU General Public License as published by |
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9 | # the Free Software Foundation; either version 2 of the License, or |
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10 | # (at your option) any later version. |
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11 | # |
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12 | # This program is distributed in the hope that it will be useful, |
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13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | # GNU General Public License for more details. |
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16 | # |
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17 | # You should have received a copy of the GNU General Public License |
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18 | # along with this program; if not, write to the Free Software |
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19 | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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20 | # |
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21 | # $Id$ |
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22 | # |
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23 | |
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24 | """This modules implements a really minimalist PJL parser.""" |
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25 | |
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26 | import sys |
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27 | |
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28 | class PJLParserError(Exception): |
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29 | """An exception for PJLParser related stuff.""" |
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30 | def __init__(self, message = ""): |
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31 | self.message = message |
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32 | Exception.__init__(self, message) |
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33 | def __repr__(self): |
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34 | return self.message |
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35 | __str__ = __repr__ |
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36 | |
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37 | class PJLParser : |
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38 | """A parser for PJL documents. |
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39 | |
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40 | Only extracts the PJL SET variables. Ignore other statements. |
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41 | """ |
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42 | def __init__(self, pjljob, debug=0) : |
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43 | """Initializes PJL Parser.""" |
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44 | self.debug = debug |
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45 | self.statements = pjljob.replace("\r\n", "\n").split("\n") |
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46 | self.default_variables = {} |
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47 | self.environment_variables = {} |
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48 | self.parsed = 0 |
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49 | self.parse() |
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50 | |
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51 | def __str__(self) : |
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52 | """Outputs our variables as a string of text.""" |
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53 | if not self.parsed : |
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54 | return "" |
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55 | mybuffer = [] |
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56 | if self.default_variables : |
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57 | mybuffer.append("Default variables :") |
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58 | for (k, v) in self.default_variables.items() : |
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59 | mybuffer.append(" %s : %s" % (k, v)) |
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60 | if self.environment_variables : |
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61 | mybuffer.append("Environment variables :") |
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62 | for (k, v) in self.environment_variables.items() : |
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63 | mybuffer.append(" %s : %s" % (k, v)) |
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64 | return "\n".join(mybuffer) |
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65 | |
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66 | def logdebug(self, message) : |
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67 | """Logs a debug message if needed.""" |
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68 | if self.debug : |
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69 | sys.stderr.write("%s\n" % message) |
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70 | |
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71 | def cleanvars(self) : |
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72 | """Cleans the variables dictionnaries.""" |
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73 | for dicname in ("default", "environment") : |
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74 | varsdic = getattr(self, "%s_variables" % dicname) |
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75 | for (k, v) in varsdic.items() : |
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76 | if len(v) == 1 : |
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77 | varsdic[k] = v[0] |
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78 | |
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79 | def parse(self) : |
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80 | """Parses a PJL job.""" |
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81 | for i in range(len(self.statements)) : |
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82 | statement = self.statements[i] |
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83 | if statement.startswith("@PJL") : |
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84 | parts = statement.split() |
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85 | nbparts = len(parts) |
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86 | if parts[0] == "@PJL" : |
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87 | # this is a valid PJL statement, but we don't |
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88 | # want to examine all of them... |
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89 | if (nbparts > 2) and (parts[1].upper() in ("SET", "DEFAULT")) : |
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90 | # this is what we are interested in ! |
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91 | try : |
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92 | (varname, value) = "".join(parts[2:]).split("=", 1) |
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93 | except : |
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94 | self.logdebug("Invalid PJL SET statement [%s]" % repr(statement)) |
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95 | else : |
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96 | # all still looks fine... |
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97 | if parts[1].upper() == "DEFAULT" : |
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98 | varsdic = self.default_variables |
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99 | else : |
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100 | varsdic = self.environment_variables |
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101 | variable = varsdic.setdefault(varname.upper(), []) |
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102 | variable.append(value) |
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103 | else : |
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104 | self.logdebug("Ignored PJL statement [%s]" % repr(statement)) |
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105 | else : |
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106 | self.logdebug("Invalid PJL statement [%s]" % repr(statement)) |
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107 | else : |
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108 | self.logdebug("Invalid PJL statement [%s]" % repr(statement)) |
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109 | self.cleanvars() |
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110 | self.parsed = 1 |
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111 | |
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112 | def test() : |
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113 | """Test function.""" |
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114 | if (len(sys.argv) < 2) or ((not sys.stdin.isatty()) and ("-" not in sys.argv[1:])) : |
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115 | sys.argv.append("-") |
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116 | for arg in sys.argv[1:] : |
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117 | if arg == "-" : |
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118 | infile = sys.stdin |
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119 | mustclose = 0 |
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120 | else : |
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121 | infile = open(arg, "rb") |
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122 | mustclose = 1 |
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123 | try : |
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124 | parser = PJLParser(infile.read(), debug=1) |
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125 | except PJLParserError, msg : |
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126 | sys.stderr.write("ERROR: %s\n" % msg) |
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127 | sys.stderr.flush() |
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128 | if mustclose : |
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129 | infile.close() |
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130 | print str(parser) |
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131 | |
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132 | if __name__ == "__main__" : |
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133 | test() |
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