Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/yaml/parser.py @ 3:758bc20232e8 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:20:52 -0400
parents 26e78fe6e8c4
children
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1
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2 # The following YAML grammar is LL(1) and is parsed by a recursive descent
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3 # parser.
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4 #
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5 # stream ::= STREAM-START implicit_document? explicit_document* STREAM-END
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6 # implicit_document ::= block_node DOCUMENT-END*
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7 # explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
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8 # block_node_or_indentless_sequence ::=
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9 # ALIAS
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10 # | properties (block_content | indentless_block_sequence)?
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11 # | block_content
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12 # | indentless_block_sequence
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13 # block_node ::= ALIAS
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14 # | properties block_content?
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15 # | block_content
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16 # flow_node ::= ALIAS
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17 # | properties flow_content?
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18 # | flow_content
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19 # properties ::= TAG ANCHOR? | ANCHOR TAG?
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20 # block_content ::= block_collection | flow_collection | SCALAR
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21 # flow_content ::= flow_collection | SCALAR
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22 # block_collection ::= block_sequence | block_mapping
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23 # flow_collection ::= flow_sequence | flow_mapping
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24 # block_sequence ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)* BLOCK-END
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25 # indentless_sequence ::= (BLOCK-ENTRY block_node?)+
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26 # block_mapping ::= BLOCK-MAPPING_START
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27 # ((KEY block_node_or_indentless_sequence?)?
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28 # (VALUE block_node_or_indentless_sequence?)?)*
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29 # BLOCK-END
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30 # flow_sequence ::= FLOW-SEQUENCE-START
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31 # (flow_sequence_entry FLOW-ENTRY)*
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32 # flow_sequence_entry?
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33 # FLOW-SEQUENCE-END
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34 # flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
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35 # flow_mapping ::= FLOW-MAPPING-START
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36 # (flow_mapping_entry FLOW-ENTRY)*
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37 # flow_mapping_entry?
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38 # FLOW-MAPPING-END
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39 # flow_mapping_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
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40 #
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41 # FIRST sets:
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42 #
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43 # stream: { STREAM-START }
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44 # explicit_document: { DIRECTIVE DOCUMENT-START }
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45 # implicit_document: FIRST(block_node)
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46 # block_node: { ALIAS TAG ANCHOR SCALAR BLOCK-SEQUENCE-START BLOCK-MAPPING-START FLOW-SEQUENCE-START FLOW-MAPPING-START }
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47 # flow_node: { ALIAS ANCHOR TAG SCALAR FLOW-SEQUENCE-START FLOW-MAPPING-START }
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48 # block_content: { BLOCK-SEQUENCE-START BLOCK-MAPPING-START FLOW-SEQUENCE-START FLOW-MAPPING-START SCALAR }
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49 # flow_content: { FLOW-SEQUENCE-START FLOW-MAPPING-START SCALAR }
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50 # block_collection: { BLOCK-SEQUENCE-START BLOCK-MAPPING-START }
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51 # flow_collection: { FLOW-SEQUENCE-START FLOW-MAPPING-START }
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52 # block_sequence: { BLOCK-SEQUENCE-START }
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53 # block_mapping: { BLOCK-MAPPING-START }
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54 # block_node_or_indentless_sequence: { ALIAS ANCHOR TAG SCALAR BLOCK-SEQUENCE-START BLOCK-MAPPING-START FLOW-SEQUENCE-START FLOW-MAPPING-START BLOCK-ENTRY }
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55 # indentless_sequence: { ENTRY }
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56 # flow_collection: { FLOW-SEQUENCE-START FLOW-MAPPING-START }
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57 # flow_sequence: { FLOW-SEQUENCE-START }
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58 # flow_mapping: { FLOW-MAPPING-START }
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59 # flow_sequence_entry: { ALIAS ANCHOR TAG SCALAR FLOW-SEQUENCE-START FLOW-MAPPING-START KEY }
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60 # flow_mapping_entry: { ALIAS ANCHOR TAG SCALAR FLOW-SEQUENCE-START FLOW-MAPPING-START KEY }
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61
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62 __all__ = ['Parser', 'ParserError']
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63
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64 from .error import MarkedYAMLError
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65 from .tokens import *
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66 from .events import *
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67 from .scanner import *
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68
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69 class ParserError(MarkedYAMLError):
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70 pass
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71
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72 class Parser:
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73 # Since writing a recursive-descendant parser is a straightforward task, we
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74 # do not give many comments here.
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75
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76 DEFAULT_TAGS = {
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77 '!': '!',
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78 '!!': 'tag:yaml.org,2002:',
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79 }
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80
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81 def __init__(self):
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82 self.current_event = None
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83 self.yaml_version = None
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84 self.tag_handles = {}
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85 self.states = []
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86 self.marks = []
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87 self.state = self.parse_stream_start
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88
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89 def dispose(self):
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90 # Reset the state attributes (to clear self-references)
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91 self.states = []
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92 self.state = None
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93
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94 def check_event(self, *choices):
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95 # Check the type of the next event.
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96 if self.current_event is None:
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97 if self.state:
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98 self.current_event = self.state()
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99 if self.current_event is not None:
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100 if not choices:
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101 return True
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102 for choice in choices:
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103 if isinstance(self.current_event, choice):
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104 return True
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105 return False
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106
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107 def peek_event(self):
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108 # Get the next event.
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109 if self.current_event is None:
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110 if self.state:
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111 self.current_event = self.state()
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112 return self.current_event
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113
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114 def get_event(self):
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115 # Get the next event and proceed further.
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116 if self.current_event is None:
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117 if self.state:
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118 self.current_event = self.state()
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119 value = self.current_event
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120 self.current_event = None
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121 return value
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122
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123 # stream ::= STREAM-START implicit_document? explicit_document* STREAM-END
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124 # implicit_document ::= block_node DOCUMENT-END*
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125 # explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
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126
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127 def parse_stream_start(self):
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128
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129 # Parse the stream start.
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130 token = self.get_token()
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131 event = StreamStartEvent(token.start_mark, token.end_mark,
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132 encoding=token.encoding)
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133
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134 # Prepare the next state.
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135 self.state = self.parse_implicit_document_start
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136
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137 return event
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138
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139 def parse_implicit_document_start(self):
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140
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141 # Parse an implicit document.
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142 if not self.check_token(DirectiveToken, DocumentStartToken,
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143 StreamEndToken):
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144 self.tag_handles = self.DEFAULT_TAGS
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145 token = self.peek_token()
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146 start_mark = end_mark = token.start_mark
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147 event = DocumentStartEvent(start_mark, end_mark,
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148 explicit=False)
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149
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150 # Prepare the next state.
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151 self.states.append(self.parse_document_end)
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152 self.state = self.parse_block_node
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153
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154 return event
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155
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156 else:
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157 return self.parse_document_start()
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158
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159 def parse_document_start(self):
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160
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161 # Parse any extra document end indicators.
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162 while self.check_token(DocumentEndToken):
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163 self.get_token()
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164
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165 # Parse an explicit document.
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166 if not self.check_token(StreamEndToken):
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167 token = self.peek_token()
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168 start_mark = token.start_mark
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169 version, tags = self.process_directives()
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170 if not self.check_token(DocumentStartToken):
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171 raise ParserError(None, None,
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172 "expected '<document start>', but found %r"
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173 % self.peek_token().id,
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174 self.peek_token().start_mark)
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175 token = self.get_token()
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176 end_mark = token.end_mark
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177 event = DocumentStartEvent(start_mark, end_mark,
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178 explicit=True, version=version, tags=tags)
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179 self.states.append(self.parse_document_end)
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180 self.state = self.parse_document_content
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181 else:
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182 # Parse the end of the stream.
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183 token = self.get_token()
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184 event = StreamEndEvent(token.start_mark, token.end_mark)
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185 assert not self.states
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186 assert not self.marks
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187 self.state = None
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188 return event
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189
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190 def parse_document_end(self):
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191
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192 # Parse the document end.
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193 token = self.peek_token()
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194 start_mark = end_mark = token.start_mark
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195 explicit = False
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196 if self.check_token(DocumentEndToken):
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197 token = self.get_token()
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198 end_mark = token.end_mark
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199 explicit = True
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200 event = DocumentEndEvent(start_mark, end_mark,
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201 explicit=explicit)
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202
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203 # Prepare the next state.
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204 self.state = self.parse_document_start
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205
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206 return event
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207
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208 def parse_document_content(self):
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209 if self.check_token(DirectiveToken,
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210 DocumentStartToken, DocumentEndToken, StreamEndToken):
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211 event = self.process_empty_scalar(self.peek_token().start_mark)
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212 self.state = self.states.pop()
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213 return event
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214 else:
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215 return self.parse_block_node()
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216
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217 def process_directives(self):
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218 self.yaml_version = None
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219 self.tag_handles = {}
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220 while self.check_token(DirectiveToken):
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221 token = self.get_token()
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222 if token.name == 'YAML':
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223 if self.yaml_version is not None:
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224 raise ParserError(None, None,
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225 "found duplicate YAML directive", token.start_mark)
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226 major, minor = token.value
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227 if major != 1:
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228 raise ParserError(None, None,
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229 "found incompatible YAML document (version 1.* is required)",
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230 token.start_mark)
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231 self.yaml_version = token.value
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232 elif token.name == 'TAG':
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233 handle, prefix = token.value
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234 if handle in self.tag_handles:
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235 raise ParserError(None, None,
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236 "duplicate tag handle %r" % handle,
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237 token.start_mark)
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238 self.tag_handles[handle] = prefix
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239 if self.tag_handles:
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240 value = self.yaml_version, self.tag_handles.copy()
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241 else:
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242 value = self.yaml_version, None
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243 for key in self.DEFAULT_TAGS:
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244 if key not in self.tag_handles:
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245 self.tag_handles[key] = self.DEFAULT_TAGS[key]
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246 return value
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247
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248 # block_node_or_indentless_sequence ::= ALIAS
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249 # | properties (block_content | indentless_block_sequence)?
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250 # | block_content
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251 # | indentless_block_sequence
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252 # block_node ::= ALIAS
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253 # | properties block_content?
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254 # | block_content
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255 # flow_node ::= ALIAS
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256 # | properties flow_content?
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257 # | flow_content
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258 # properties ::= TAG ANCHOR? | ANCHOR TAG?
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259 # block_content ::= block_collection | flow_collection | SCALAR
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260 # flow_content ::= flow_collection | SCALAR
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261 # block_collection ::= block_sequence | block_mapping
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262 # flow_collection ::= flow_sequence | flow_mapping
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263
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264 def parse_block_node(self):
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265 return self.parse_node(block=True)
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266
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267 def parse_flow_node(self):
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268 return self.parse_node()
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269
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270 def parse_block_node_or_indentless_sequence(self):
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271 return self.parse_node(block=True, indentless_sequence=True)
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272
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273 def parse_node(self, block=False, indentless_sequence=False):
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274 if self.check_token(AliasToken):
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275 token = self.get_token()
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276 event = AliasEvent(token.value, token.start_mark, token.end_mark)
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277 self.state = self.states.pop()
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278 else:
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279 anchor = None
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280 tag = None
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281 start_mark = end_mark = tag_mark = None
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282 if self.check_token(AnchorToken):
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283 token = self.get_token()
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284 start_mark = token.start_mark
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285 end_mark = token.end_mark
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286 anchor = token.value
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287 if self.check_token(TagToken):
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288 token = self.get_token()
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289 tag_mark = token.start_mark
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290 end_mark = token.end_mark
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291 tag = token.value
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292 elif self.check_token(TagToken):
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293 token = self.get_token()
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294 start_mark = tag_mark = token.start_mark
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295 end_mark = token.end_mark
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296 tag = token.value
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297 if self.check_token(AnchorToken):
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298 token = self.get_token()
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299 end_mark = token.end_mark
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300 anchor = token.value
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301 if tag is not None:
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302 handle, suffix = tag
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303 if handle is not None:
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304 if handle not in self.tag_handles:
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305 raise ParserError("while parsing a node", start_mark,
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306 "found undefined tag handle %r" % handle,
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307 tag_mark)
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308 tag = self.tag_handles[handle]+suffix
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309 else:
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310 tag = suffix
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311 #if tag == '!':
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312 # raise ParserError("while parsing a node", start_mark,
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313 # "found non-specific tag '!'", tag_mark,
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314 # "Please check 'http://pyyaml.org/wiki/YAMLNonSpecificTag' and share your opinion.")
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315 if start_mark is None:
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316 start_mark = end_mark = self.peek_token().start_mark
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317 event = None
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318 implicit = (tag is None or tag == '!')
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319 if indentless_sequence and self.check_token(BlockEntryToken):
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320 end_mark = self.peek_token().end_mark
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321 event = SequenceStartEvent(anchor, tag, implicit,
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322 start_mark, end_mark)
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323 self.state = self.parse_indentless_sequence_entry
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324 else:
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325 if self.check_token(ScalarToken):
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326 token = self.get_token()
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327 end_mark = token.end_mark
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328 if (token.plain and tag is None) or tag == '!':
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329 implicit = (True, False)
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330 elif tag is None:
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331 implicit = (False, True)
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332 else:
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333 implicit = (False, False)
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334 event = ScalarEvent(anchor, tag, implicit, token.value,
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335 start_mark, end_mark, style=token.style)
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336 self.state = self.states.pop()
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337 elif self.check_token(FlowSequenceStartToken):
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338 end_mark = self.peek_token().end_mark
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339 event = SequenceStartEvent(anchor, tag, implicit,
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340 start_mark, end_mark, flow_style=True)
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341 self.state = self.parse_flow_sequence_first_entry
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342 elif self.check_token(FlowMappingStartToken):
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343 end_mark = self.peek_token().end_mark
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344 event = MappingStartEvent(anchor, tag, implicit,
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345 start_mark, end_mark, flow_style=True)
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346 self.state = self.parse_flow_mapping_first_key
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347 elif block and self.check_token(BlockSequenceStartToken):
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348 end_mark = self.peek_token().start_mark
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349 event = SequenceStartEvent(anchor, tag, implicit,
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350 start_mark, end_mark, flow_style=False)
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351 self.state = self.parse_block_sequence_first_entry
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352 elif block and self.check_token(BlockMappingStartToken):
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353 end_mark = self.peek_token().start_mark
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354 event = MappingStartEvent(anchor, tag, implicit,
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355 start_mark, end_mark, flow_style=False)
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356 self.state = self.parse_block_mapping_first_key
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357 elif anchor is not None or tag is not None:
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358 # Empty scalars are allowed even if a tag or an anchor is
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359 # specified.
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360 event = ScalarEvent(anchor, tag, (implicit, False), '',
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361 start_mark, end_mark)
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362 self.state = self.states.pop()
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363 else:
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364 if block:
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365 node = 'block'
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366 else:
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367 node = 'flow'
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368 token = self.peek_token()
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369 raise ParserError("while parsing a %s node" % node, start_mark,
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370 "expected the node content, but found %r" % token.id,
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371 token.start_mark)
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372 return event
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373
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374 # block_sequence ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)* BLOCK-END
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375
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376 def parse_block_sequence_first_entry(self):
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377 token = self.get_token()
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378 self.marks.append(token.start_mark)
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379 return self.parse_block_sequence_entry()
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380
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381 def parse_block_sequence_entry(self):
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382 if self.check_token(BlockEntryToken):
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383 token = self.get_token()
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384 if not self.check_token(BlockEntryToken, BlockEndToken):
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385 self.states.append(self.parse_block_sequence_entry)
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386 return self.parse_block_node()
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387 else:
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388 self.state = self.parse_block_sequence_entry
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389 return self.process_empty_scalar(token.end_mark)
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390 if not self.check_token(BlockEndToken):
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391 token = self.peek_token()
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392 raise ParserError("while parsing a block collection", self.marks[-1],
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393 "expected <block end>, but found %r" % token.id, token.start_mark)
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394 token = self.get_token()
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395 event = SequenceEndEvent(token.start_mark, token.end_mark)
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396 self.state = self.states.pop()
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397 self.marks.pop()
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398 return event
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399
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400 # indentless_sequence ::= (BLOCK-ENTRY block_node?)+
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401
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402 def parse_indentless_sequence_entry(self):
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403 if self.check_token(BlockEntryToken):
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404 token = self.get_token()
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405 if not self.check_token(BlockEntryToken,
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406 KeyToken, ValueToken, BlockEndToken):
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407 self.states.append(self.parse_indentless_sequence_entry)
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408 return self.parse_block_node()
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409 else:
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410 self.state = self.parse_indentless_sequence_entry
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411 return self.process_empty_scalar(token.end_mark)
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412 token = self.peek_token()
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413 event = SequenceEndEvent(token.start_mark, token.start_mark)
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414 self.state = self.states.pop()
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415 return event
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416
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417 # block_mapping ::= BLOCK-MAPPING_START
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418 # ((KEY block_node_or_indentless_sequence?)?
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419 # (VALUE block_node_or_indentless_sequence?)?)*
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420 # BLOCK-END
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421
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422 def parse_block_mapping_first_key(self):
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423 token = self.get_token()
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424 self.marks.append(token.start_mark)
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425 return self.parse_block_mapping_key()
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426
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427 def parse_block_mapping_key(self):
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428 if self.check_token(KeyToken):
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429 token = self.get_token()
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430 if not self.check_token(KeyToken, ValueToken, BlockEndToken):
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431 self.states.append(self.parse_block_mapping_value)
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432 return self.parse_block_node_or_indentless_sequence()
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433 else:
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434 self.state = self.parse_block_mapping_value
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435 return self.process_empty_scalar(token.end_mark)
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436 if not self.check_token(BlockEndToken):
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437 token = self.peek_token()
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438 raise ParserError("while parsing a block mapping", self.marks[-1],
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439 "expected <block end>, but found %r" % token.id, token.start_mark)
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440 token = self.get_token()
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441 event = MappingEndEvent(token.start_mark, token.end_mark)
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442 self.state = self.states.pop()
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443 self.marks.pop()
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444 return event
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445
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446 def parse_block_mapping_value(self):
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447 if self.check_token(ValueToken):
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448 token = self.get_token()
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449 if not self.check_token(KeyToken, ValueToken, BlockEndToken):
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450 self.states.append(self.parse_block_mapping_key)
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451 return self.parse_block_node_or_indentless_sequence()
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452 else:
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453 self.state = self.parse_block_mapping_key
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454 return self.process_empty_scalar(token.end_mark)
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455 else:
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456 self.state = self.parse_block_mapping_key
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457 token = self.peek_token()
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458 return self.process_empty_scalar(token.start_mark)
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459
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460 # flow_sequence ::= FLOW-SEQUENCE-START
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461 # (flow_sequence_entry FLOW-ENTRY)*
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462 # flow_sequence_entry?
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463 # FLOW-SEQUENCE-END
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464 # flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
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465 #
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466 # Note that while production rules for both flow_sequence_entry and
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467 # flow_mapping_entry are equal, their interpretations are different.
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468 # For `flow_sequence_entry`, the part `KEY flow_node? (VALUE flow_node?)?`
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469 # generate an inline mapping (set syntax).
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470
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471 def parse_flow_sequence_first_entry(self):
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472 token = self.get_token()
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473 self.marks.append(token.start_mark)
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474 return self.parse_flow_sequence_entry(first=True)
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475
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476 def parse_flow_sequence_entry(self, first=False):
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477 if not self.check_token(FlowSequenceEndToken):
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478 if not first:
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479 if self.check_token(FlowEntryToken):
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480 self.get_token()
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481 else:
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482 token = self.peek_token()
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483 raise ParserError("while parsing a flow sequence", self.marks[-1],
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484 "expected ',' or ']', but got %r" % token.id, token.start_mark)
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485
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486 if self.check_token(KeyToken):
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487 token = self.peek_token()
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488 event = MappingStartEvent(None, None, True,
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489 token.start_mark, token.end_mark,
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490 flow_style=True)
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491 self.state = self.parse_flow_sequence_entry_mapping_key
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492 return event
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493 elif not self.check_token(FlowSequenceEndToken):
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494 self.states.append(self.parse_flow_sequence_entry)
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495 return self.parse_flow_node()
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496 token = self.get_token()
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497 event = SequenceEndEvent(token.start_mark, token.end_mark)
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498 self.state = self.states.pop()
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499 self.marks.pop()
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500 return event
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501
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502 def parse_flow_sequence_entry_mapping_key(self):
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503 token = self.get_token()
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504 if not self.check_token(ValueToken,
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505 FlowEntryToken, FlowSequenceEndToken):
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506 self.states.append(self.parse_flow_sequence_entry_mapping_value)
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507 return self.parse_flow_node()
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508 else:
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509 self.state = self.parse_flow_sequence_entry_mapping_value
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510 return self.process_empty_scalar(token.end_mark)
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511
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512 def parse_flow_sequence_entry_mapping_value(self):
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513 if self.check_token(ValueToken):
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514 token = self.get_token()
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515 if not self.check_token(FlowEntryToken, FlowSequenceEndToken):
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516 self.states.append(self.parse_flow_sequence_entry_mapping_end)
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517 return self.parse_flow_node()
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518 else:
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519 self.state = self.parse_flow_sequence_entry_mapping_end
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520 return self.process_empty_scalar(token.end_mark)
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521 else:
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522 self.state = self.parse_flow_sequence_entry_mapping_end
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523 token = self.peek_token()
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524 return self.process_empty_scalar(token.start_mark)
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525
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526 def parse_flow_sequence_entry_mapping_end(self):
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527 self.state = self.parse_flow_sequence_entry
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528 token = self.peek_token()
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529 return MappingEndEvent(token.start_mark, token.start_mark)
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530
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531 # flow_mapping ::= FLOW-MAPPING-START
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532 # (flow_mapping_entry FLOW-ENTRY)*
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533 # flow_mapping_entry?
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534 # FLOW-MAPPING-END
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535 # flow_mapping_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
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536
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537 def parse_flow_mapping_first_key(self):
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538 token = self.get_token()
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539 self.marks.append(token.start_mark)
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540 return self.parse_flow_mapping_key(first=True)
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541
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542 def parse_flow_mapping_key(self, first=False):
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543 if not self.check_token(FlowMappingEndToken):
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544 if not first:
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545 if self.check_token(FlowEntryToken):
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546 self.get_token()
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547 else:
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548 token = self.peek_token()
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549 raise ParserError("while parsing a flow mapping", self.marks[-1],
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550 "expected ',' or '}', but got %r" % token.id, token.start_mark)
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551 if self.check_token(KeyToken):
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552 token = self.get_token()
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553 if not self.check_token(ValueToken,
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554 FlowEntryToken, FlowMappingEndToken):
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555 self.states.append(self.parse_flow_mapping_value)
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556 return self.parse_flow_node()
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557 else:
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558 self.state = self.parse_flow_mapping_value
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559 return self.process_empty_scalar(token.end_mark)
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560 elif not self.check_token(FlowMappingEndToken):
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561 self.states.append(self.parse_flow_mapping_empty_value)
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562 return self.parse_flow_node()
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563 token = self.get_token()
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564 event = MappingEndEvent(token.start_mark, token.end_mark)
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565 self.state = self.states.pop()
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566 self.marks.pop()
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567 return event
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568
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569 def parse_flow_mapping_value(self):
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570 if self.check_token(ValueToken):
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571 token = self.get_token()
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572 if not self.check_token(FlowEntryToken, FlowMappingEndToken):
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573 self.states.append(self.parse_flow_mapping_key)
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574 return self.parse_flow_node()
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575 else:
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576 self.state = self.parse_flow_mapping_key
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577 return self.process_empty_scalar(token.end_mark)
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578 else:
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579 self.state = self.parse_flow_mapping_key
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580 token = self.peek_token()
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581 return self.process_empty_scalar(token.start_mark)
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582
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583 def parse_flow_mapping_empty_value(self):
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584 self.state = self.parse_flow_mapping_key
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585 return self.process_empty_scalar(self.peek_token().start_mark)
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586
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587 def process_empty_scalar(self, mark):
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588 return ScalarEvent(None, None, (True, False), '', mark, mark)
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589