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annotate TAL/TALDefs.py @ 1042:adcfdeac4e76

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author Richard Jones <richard@users.sourceforge.net>
date Wed, 04 Sep 2002 04:47:28 +0000
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children
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1 ##############################################################################
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2 #
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3 # Copyright (c) 2001, 2002 Zope Corporation and Contributors.
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4 # All Rights Reserved.
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5 #
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6 # This software is subject to the provisions of the Zope Public License,
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7 # Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
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8 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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9 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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10 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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11 # FOR A PARTICULAR PURPOSE
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12 #
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13 ##############################################################################
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14 """
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15 Common definitions used by TAL and METAL compilation an transformation.
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16 """
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17
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18 from types import ListType, TupleType
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19
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20 TAL_VERSION = "1.3.2"
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21
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22 XML_NS = "http://www.w3.org/XML/1998/namespace" # URI for XML namespace
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23 XMLNS_NS = "http://www.w3.org/2000/xmlns/" # URI for XML NS declarations
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24
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25 ZOPE_TAL_NS = "http://xml.zope.org/namespaces/tal"
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26 ZOPE_METAL_NS = "http://xml.zope.org/namespaces/metal"
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27
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28 NAME_RE = "[a-zA-Z_][a-zA-Z0-9_]*"
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29
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30 KNOWN_METAL_ATTRIBUTES = [
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31 "define-macro",
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32 "use-macro",
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33 "define-slot",
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34 "fill-slot",
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35 "slot"
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36 ]
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37
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38 KNOWN_TAL_ATTRIBUTES = [
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39 "define",
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40 "condition",
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41 "content",
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42 "replace",
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43 "repeat",
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44 "attributes",
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45 "on-error",
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46 "omit-tag",
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47 "tal tag",
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48 ]
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49
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50 class TALError(Exception):
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51
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52 def __init__(self, msg, position=(None, None)):
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53 assert msg != ""
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54 self.msg = msg
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55 self.lineno = position[0]
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56 self.offset = position[1]
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57
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58 def __str__(self):
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59 result = self.msg
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60 if self.lineno is not None:
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61 result = result + ", at line %d" % self.lineno
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62 if self.offset is not None:
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63 result = result + ", column %d" % (self.offset + 1)
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64 return result
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65
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66 class METALError(TALError):
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67 pass
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68
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69 class TALESError(TALError):
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70 pass
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71
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72 class ErrorInfo:
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73
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74 def __init__(self, err, position=(None, None)):
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75 if isinstance(err, Exception):
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76 self.type = err.__class__
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77 self.value = err
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78 else:
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79 self.type = err
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80 self.value = None
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81 self.lineno = position[0]
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82 self.offset = position[1]
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83
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84 import re
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85 _attr_re = re.compile(r"\s*([^\s]+)\s+([^\s].*)\Z", re.S)
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86 _subst_re = re.compile(r"\s*(?:(text|structure)\s+)?(.*)\Z", re.S)
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87 del re
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88
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89 def parseAttributeReplacements(arg):
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90 dict = {}
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91 for part in splitParts(arg):
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92 m = _attr_re.match(part)
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93 if not m:
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94 raise TALError("Bad syntax in attributes:" + `part`)
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95 name, expr = m.group(1, 2)
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96 if dict.has_key(name):
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97 raise TALError("Duplicate attribute name in attributes:" + `part`)
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98 dict[name] = expr
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99 return dict
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100
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101 def parseSubstitution(arg, position=(None, None)):
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102 m = _subst_re.match(arg)
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103 if not m:
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104 raise TALError("Bad syntax in substitution text: " + `arg`, position)
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105 key, expr = m.group(1, 2)
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106 if not key:
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107 key = "text"
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108 return key, expr
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109
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110 def splitParts(arg):
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111 # Break in pieces at undoubled semicolons and
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112 # change double semicolons to singles:
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113 import string
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114 arg = string.replace(arg, ";;", "\0")
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115 parts = string.split(arg, ';')
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116 parts = map(lambda s, repl=string.replace: repl(s, "\0", ";"), parts)
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117 if len(parts) > 1 and not string.strip(parts[-1]):
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118 del parts[-1] # It ended in a semicolon
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119 return parts
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120
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121 def isCurrentVersion(program):
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122 version = getProgramVersion(program)
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123 return version == TAL_VERSION
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124
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125 def getProgramMode(program):
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126 version = getProgramVersion(program)
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127 if (version == TAL_VERSION and isinstance(program[1], TupleType) and
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128 len(program[1]) == 2):
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129 opcode, mode = program[1]
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130 if opcode == "mode":
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131 return mode
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132 return None
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133
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134 def getProgramVersion(program):
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135 if (len(program) >= 2 and
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136 isinstance(program[0], TupleType) and len(program[0]) == 2):
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137 opcode, version = program[0]
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138 if opcode == "version":
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139 return version
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140 return None
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141
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142 import cgi
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143 def quote(s, escape=cgi.escape):
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144 return '"%s"' % escape(s, 1)
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145 del cgi
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