Mercurial > hg > expressionparser

annotate expr.py @ 1:c45135ec8c13

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slight cleanup
author Ted Mielczarek <ted.mielczarek@gmail.com>
date Wed, 01 Jun 2011 20:00:51 -0400
parents ae57e69e4b15
children 94a293b914af
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/usr/bin/env python
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2
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3 import re, unittest
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4
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5 # ideas taken from http://effbot.org/zone/simple-top-down-parsing.htm
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6 # token classes
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7 class ident_token:
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8 def __init__(self, value):
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9 self.value = value
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10 def nud(self, parser):
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11 # identifiers take their value from the value mappings passed
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12 # to the parser
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13 return parser.value(self.value)
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14
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15 class int_token:
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16 def __init__(self, value):
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17 self.value = int(value)
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18 def nud(self, parser):
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19 return self.value
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20
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21 class bool_token:
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22 def __init__(self, value):
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23 self.value = {'true':True, 'false':False}[value]
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24 def nud(self, parser):
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25 return self.value
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26
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27 class eq_op_token:
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28 "=="
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29 lbp = 20
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30 def led(self, parser, left):
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31 return left == parser.expression(self.lbp)
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32
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33 class neq_op_token:
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34 "!="
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35 lbp = 20
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36 def led(self, parser, left):
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37 return left != parser.expression(self.lbp)
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38
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39 class and_op_token:
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40 "&&"
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41 lbp = 11
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42 def led(self, parser, left):
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43 right = parser.expression(self.lbp)
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44 return left and right
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45
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46 class or_op_token:
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47 "||"
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48 lbp = 10
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49 def led(self, parser, left):
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50 right = parser.expression(self.lbp)
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51 return left or right
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52
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53 class lparen_token:
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54 "("
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55 lbp = 50
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56 def nud(self, parser):
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57 expr = parser.expression()
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58 parser.advance(rparen_token)
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59 return expr
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60
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61 class rparen_token:
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62 ")"
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63 lbp = 0
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64
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65 class string_token:
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66 def __init__(self, value):
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67 self.value = value
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68 def nud(self, parser):
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69 return self.value
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70
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71 class end_token:
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72 # lowest left binding power, always ends parsing
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73 lbp = 0
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74
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75 class ExpressionParser(object):
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76 def __init__(self, text, valuemapping):
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77 """
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78 Initialize the parser with input |text|, and |valuemapping| as
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79 a dict mapping identifier names to values.
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80 """
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81 self.text = text
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82 self.valuemapping = valuemapping
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83
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84 def _tokenize(self):
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85 """
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86 Lex the input text into tokens and yield them in sequence.
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87 """
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88 # scanner callbacks
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89 def bool_(scanner, t): return bool_token(t)
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90 def identifier(scanner, t): return ident_token(t)
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91 def integer(scanner, t): return int_token(t)
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92 def eq(scanner, t): return eq_op_token()
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93 def neq(scanner, t): return neq_op_token()
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94 def or_(scanner, t): return or_op_token()
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95 def and_(scanner, t): return and_op_token()
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96 def lparen(scanner, t): return lparen_token()
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97 def rparen(scanner, t): return rparen_token()
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98 def string_(scanner, t): return string_token(t[1:-1])
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99
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100 scanner = re.Scanner([
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101 (r"true|false", bool_),
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102 (r"[a-zA-Z_]\w*", identifier),
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103 (r"[0-9]+", integer),
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104 (r'"[^"]*"', string_),
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105 (r"==", eq),
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106 (r"!=", neq),
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107 (r"\|\|", or_),
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108 (r"&&", and_),
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109 (r"\(", lparen),
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110 (r"\)", rparen),
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111 (r"\s+", None), # skip whitespace
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112 ])
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113 tokens, remainder = scanner.scan(self.text)
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114 for t in tokens:
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115 yield t
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116 yield end_token()
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117
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118 def value(self, ident):
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119 """
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120 Look up the value of |ident| in the value mapping passed in the
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121 constructor.
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122 """
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123 return self.valuemapping[ident]
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124
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125 def advance(self, expected):
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126 """
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127 Assert that the next token is an instance of |expected|, and advance
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128 to the next token.
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129 """
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130 if not isinstance(self.token, expected):
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131 raise Exception, "Unexpected token!"
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132 self.token = self.iter.next()
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133
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134 def expression(self, rbp=0):
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135 """
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136 Parse and return the value of an expression until a token with
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137 right binding power greater than rbp is encountered.
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138 """
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139 t = self.token
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140 self.token = self.iter.next()
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141 left = t.nud(self)
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142 while rbp < self.token.lbp:
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143 t = self.token
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144 self.token = self.iter.next()
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145 left = t.led(self, left)
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146 return left
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147
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148 def parse(self):
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149 """
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150 Parse and return the value of the expression in the text
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151 passed to the constructor.
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152 """
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153 self.iter = self._tokenize()
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154 self.token = self.iter.next()
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155 return self.expression()
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156
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157 class ExpressionParserUnittest(unittest.TestCase):
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158 def parse(self, text, values):
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159 return ExpressionParser(text, values).parse()
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160
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161 def test_BasicValues(self):
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162 self.assertEqual(1, self.parse("1", {}))
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163 self.assertEqual(100, self.parse("100", {}))
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164 self.assertEqual(True, self.parse("true", {}))
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165 self.assertEqual(False, self.parse("false", {}))
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166 self.assertEqual("", self.parse('""', {}))
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167 self.assertEqual("foo bar", self.parse('"foo bar"', {}))
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168 self.assertEqual(1, self.parse("foo", {'foo':1}))
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169 self.assertEqual(True, self.parse("bar", {'bar':True}))
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170 self.assertEqual("xyz", self.parse("abc123", {'abc123':"xyz"}))
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171
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172 def test_Equality(self):
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173 self.assertTrue(self.parse("true == true", {}))
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174 self.assertTrue(self.parse("false == false", {}))
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175 self.assertTrue(self.parse("false == false", {}))
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176 self.assertTrue(self.parse("1 == 1", {}))
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177 self.assertTrue(self.parse("100 == 100", {}))
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178 self.assertTrue(self.parse('"some text" == "some text"', {}))
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179 self.assertTrue(self.parse("true != false", {}))
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180 self.assertTrue(self.parse("1 != 2", {}))
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181 self.assertTrue(self.parse('"text" != "other text"', {}))
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182 self.assertTrue(self.parse("foo == true", {'foo': True}))
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183 self.assertTrue(self.parse("foo == 1", {'foo': 1}))
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184 self.assertTrue(self.parse('foo == "bar"', {'foo': 'bar'}))
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185 self.assertTrue(self.parse("foo == bar", {'foo': True, 'bar': True}))
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186 self.assertTrue(self.parse("true == foo", {'foo': True}))
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187 self.assertTrue(self.parse("foo != true", {'foo': False}))
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188 self.assertTrue(self.parse("foo != 2", {'foo': 1}))
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189 self.assertTrue(self.parse('foo != "bar"', {'foo': 'abc'}))
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190 self.assertTrue(self.parse("foo != bar", {'foo': True, 'bar': False}))
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191 self.assertTrue(self.parse("true != foo", {'foo': False}))
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192
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193 def test_Conjunctions(self):
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194 self.assertTrue(self.parse("true && true", {}))
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195 self.assertTrue(self.parse("true || false", {}))
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196 self.assertFalse(self.parse("false || false", {}))
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197 self.assertFalse(self.parse("true && false", {}))
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198
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199 if __name__ == '__main__':
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200 unittest.main()