Class: Puppet::Pops::Parser::Parser

Inherits:
Racc::Parser
  • Object
show all
Defined in:
lib/puppet/pops/parser/parser_support.rb,
lib/puppet/pops/parser/eparser.rb

Overview

It is only concerned with parsing.

Direct Known Subclasses

EppParser

Constant Summary collapse

Racc_arg = 
[
racc_action_table,
racc_action_check,
racc_action_default,
racc_action_pointer,
racc_goto_table,
racc_goto_check,
racc_goto_default,
racc_goto_pointer,
racc_nt_base,
racc_reduce_table,
racc_token_table,
racc_shift_n,
racc_reduce_n,
racc_use_result_var ]
Racc_token_to_s_table = 
[
"$end",
"error",
"STRING",
"DQPRE",
"DQMID",
"DQPOST",
"WORD",
"LBRACK",
"RBRACK",
"LBRACE",
"RBRACE",
"SYMBOL",
"FARROW",
"COMMA",
"TRUE",
"FALSE",
"EQUALS",
"APPENDS",
"DELETES",
"LESSEQUAL",
"NOTEQUAL",
"DOT",
"COLON",
"LLCOLLECT",
"RRCOLLECT",
"QMARK",
"WSLPAREN",
"LPAREN",
"RPAREN",
"ISEQUAL",
"GREATEREQUAL",
"GREATERTHAN",
"LESSTHAN",
"IF",
"ELSE",
"DEFINE",
"ELSIF",
"VARIABLE",
"CLASS",
"INHERITS",
"NODE",
"BOOLEAN",
"NAME",
"SEMIC",
"CASE",
"DEFAULT",
"AT",
"ATAT",
"LCOLLECT",
"RCOLLECT",
"CLASSREF",
"NOT",
"OR",
"AND",
"UNDEF",
"PARROW",
"PLUS",
"MINUS",
"TIMES",
"DIV",
"LSHIFT",
"RSHIFT",
"UMINUS",
"MATCH",
"NOMATCH",
"REGEX",
"IN_EDGE",
"OUT_EDGE",
"IN_EDGE_SUB",
"OUT_EDGE_SUB",
"IN",
"UNLESS",
"PIPE",
"LAMBDA",
"SELBRACE",
"NUMBER",
"HEREDOC",
"SUBLOCATE",
"RENDER_STRING",
"RENDER_EXPR",
"EPP_START",
"EPP_END",
"EPP_END_TRIM",
"FUNCTION",
"TYPE",
"PRIVATE",
"ATTR",
"APPLICATION_R",
"CONSUMES_R",
"PRODUCES_R",
"SITE_R",
"APPLICATION",
"PRODUCES",
"CONSUMES",
"SITE",
"LOW",
"HIGH",
"LISTSTART",
"SPLAT",
"MODULO",
"$start",
"program",
"statements",
"epp_expression",
"syntactic_statements",
"syntactic_statement",
"assignment",
"relationship",
"assignments",
"resource",
"expression",
"attribute_operations",
"additional_resource_bodies",
"resource_bodies",
"endsemi",
"endcomma",
"resource_body",
"primary_expression",
"capability_mapping",
"call_function_expression",
"bracketed_expression",
"selector_entries",
"expressions",
"variable",
"call_method_with_lambda_expression",
"collection_expression",
"case_expression",
"if_expression",
"unless_expression",
"definition_expression",
"application_expression",
"hostclass_expression",
"node_definition_expression",
"site_definition_expression",
"epp_render_expression",
"function_definition",
"type_alias",
"type_definition",
"reserved_word",
"array",
"hash",
"regex",
"quotedtext",
"type",
"call_function_start",
"lambda",
"call_method_expression",
"named_access",
"lambda_parameter_list",
"opt_return_type",
"lambda_rest",
"parameters",
"if_part",
"else",
"unless_else",
"case_options",
"case_option",
"options_statements",
"nil",
"selector_entry",
"selector_entry_list",
"collect_query",
"optional_query",
"attribute_operation",
"attribute_name",
"keyword",
"classname",
"parameter_list",
"opt_statements",
"capability_kw",
"stacked_classname",
"classparent",
"classnameordefault",
"hostnames",
"nodeparent",
"hostname",
"dotted_name",
"name_or_number",
"parameter",
"untyped_parameter",
"typed_parameter",
"regular_parameter",
"splat_parameter",
"parameter_type",
"optional_statements",
"collection_entries",
"hashpairs",
"hashpair",
"collection_entry",
"collection_entry_keyword",
"string",
"dq_string",
"heredoc",
"dqpre",
"dqrval",
"dqpost",
"dqmid",
"text_expression",
"dqtail",
"sublocated_text",
"epp_parameters_list",
"epp_end" ]
Racc_debug_parser = 
false
Factory =

Simplify access to the Model factory Note that the parser/parser support does not have direct knowledge about the Model. All model construction/manipulation is made by the Factory.

Model::Factory

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Parser

Returns a new instance of Parser.



87
88
89
90
91
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 87

def initialize()
  @lexer = Lexer2.new
  @namestack = []
  @definitions = []
end

Instance Attribute Details

#definitions ⇒ Object (readonly) 



25
26
27
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 25

def definitions
  @definitions
end

#lexer ⇒ Object 



24
25
26
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 24

def lexer
  @lexer
end

Instance Method Details

#_parse ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Performs the parsing and returns the resulting model. The lexer holds state, and this is setup with #parse_string, or #parse_file.



237
238
239
240
241
242
243
244
245
246
247
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 237

def _parse()
  begin
    @yydebug = false
    main = yyparse(@lexer,:scan)
  end
  return main
ensure
  @lexer.clear
  @namestack = []
  @definitions = []
end

#_reduce_none(val, _values, result) ⇒ Object 



3236
3237
3238
 
# File 'lib/puppet/pops/parser/eparser.rb', line 3236

def _reduce_none(val, _values, result)
  val[0]
end

#add_definition(definition) ⇒ Object 



170
171
172
173
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 170

def add_definition(definition)
  @definitions << definition.current
  definition
end

#add_mapping(produces) ⇒ Object 



175
176
177
178
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 175

def add_mapping(produces)
  # The actual handling of mappings happens in PopsBridge
  add_definition(produces)
end

#aryfy(o) ⇒ Object 



153
154
155
156
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 153

def aryfy(o)
  o = [o] unless o.is_a?(Array)
  o
end

#classname(name) ⇒ Object

Produces the fully qualified name, with the full (current) namespace for a given name.

This is needed because class bodies are lazily evaluated and an inner class’ container(s) may not have been evaluated before some external reference is made to the inner class; its must therefore know its complete name before evaluation-time.



43
44
45
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 43

def classname(name)
  [namespace, name].join('::').sub(/^::/, '')
end

#create_empty_program ⇒ Object

Creates an empty program with a single No-op at the input’s EOF offset with 0 length.



219
220
221
222
223
224
225
226
227
228
229
230
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 219

def create_empty_program()
  locator = @lexer.locator
  no_op = Factory.literal(nil)
  # Create a synthetic NOOP token at EOF offset with 0 size. The lexer does not produce an EOF token that is
  # visible to the grammar rules. Creating this token is mainly to reuse the positioning logic as it
  # expects a token decorated with location information.
  token_sym, token = @lexer.emit_completed([:NOOP,'',0], locator.string.bytesize)
  loc(no_op, token)
  # Program with a Noop
  program = Factory.PROGRAM(no_op, [], locator)
  program
end

#create_program(body) ⇒ Object

Creates a program with the given body.



212
213
214
215
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 212

def create_program(body)
  locator = @lexer.locator
  Factory.PROGRAM(body, definitions, locator)
end

#error(semantic, message) ⇒ Object

Raises a Parse error with location information. Information about file is always obtained from the lexer. Line and position is produced if the given semantic is a Positioned object and have been given an offset.



50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 50

def error(semantic, message)
  except = Puppet::ParseError.new(message)
  if semantic.is_a?(LexerSupport::TokenValue)
    except.file = semantic[:file];
    except.line = semantic[:line];
    except.pos = semantic[:pos];
  else
    semantic = semantic.current() if semantic.is_a?(Factory)

    # Adapt the model so it is possible to get location information.
    # The model may not have been added to the source tree, so give it the lexer's locator
    # directly instead of searching for the root Program where the locator is normally stored.
    #
    if semantic.is_a?(Model::Positioned)
      adapter = Adapters::SourcePosAdapter.adapt(semantic)
      adapter.locator = @lexer.locator
    else
      adapter = nil
    end
    except.file = @lexer.locator.file
    except.line = adapter.line if adapter
    except.pos = adapter.pos if adapter
  end
  raise except
end

#heredoc_loc(factory, start_locateabke, end_locateable = nil) ⇒ Factory

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Mark the factory wrapped heredoc model object with location information

Returns:



149
150
151
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 149

def heredoc_loc(factory, start_locateabke, end_locateable = nil)
  factory.record_heredoc_position(start_locatable, end_locatable)
end

#loc(factory, start_locateable, end_locateable = nil) ⇒ Factory

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Mark the factory wrapped model object with location information

Returns:



141
142
143
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 141

def loc(factory, start_locateable, end_locateable = nil)
  factory.record_position(start_locateable, end_locateable)
end

#namepop ⇒ Object 



166
167
168
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 166

def namepop()
  @namestack.pop
end

#namespace ⇒ Object 



158
159
160
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 158

def namespace
  @namestack.join('::')
end

#namestack(name) ⇒ Object 



162
163
164
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 162

def namestack(name)
  @namestack << name
end

#on_error(token, value, stack) ⇒ Object

This is a callback from the generated parser (when an error occurs while parsing)

Raises:



95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 95

def on_error(token,value,stack)
  if token == 0 # denotes end of file
    value_at = 'end of file'
  else
    value_at = "'#{value[:value]}'"
  end
  error = Issues::SYNTAX_ERROR.format(:where => value_at)
  error = "#{error}, token: #{token}" if @yydebug

  # Note, old parser had processing of "expected token here" - do not try to reinstate:
  # The 'expected' is only of value at end of input, otherwise any parse error involving a
  # start of a pair will be reported as expecting the close of the pair - e.g. "$x.each |$x {|", would
  # report that "seeing the '{', the '}' is expected. That would be wrong.
  # Real "expected" tokens are very difficult to compute (would require parsing of racc output data). Output of the stack
  # could help, but can require extensive backtracking and produce many options.
  #
  # The lexer should handle the "expected instead of end of file for strings, and interpolation", other expectancies
  # must be handled by the grammar. The lexer may have enqueued tokens far ahead - the lexer's opinion about this
  # is not trustworthy.
  #
  file = nil
  line = nil
  pos  = nil
  if token != 0
    file = value[:file]
    line = value[:line]
    pos  = value[:pos]
  else
    # At end of input, use what the lexer thinks is the source file
    file = lexer.file
  end
  file = nil unless file.is_a?(String) && !file.empty?
  raise Puppet::ParseErrorWithIssue.new(error, file, line, pos, nil, issue_code = Issues::SYNTAX_ERROR.issue_code)
end

#parse_file(file) ⇒ Object

Parses a file expected to contain pp DSL logic.



77
78
79
80
81
82
83
84
85
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 77

def parse_file(file)
  unless Puppet::FileSystem.exist?(file)
    unless file =~ /\.pp$/
      file = file + ".pp"
    end
  end
  @lexer.file = file
  _parse()
end

#parse_string(code, path = '') ⇒ Object

Parses a String of pp DSL code.



132
133
134
135
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 132

def parse_string(code, path = '')
  @lexer.lex_string(code, path)
  _parse()
end

#token_text(t) ⇒ Object

Returns the token text of the given lexer token, or nil, if token is nil



28
29
30
31
32
33
34
35
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 28

def token_text t
  return t if t.nil?
  t = t.current if t.respond_to?(:current)
  return t.value if t.is_a? Model::QualifiedName

  # else it is a lexer token
  t[:value]
end

#transform_calls(expressions) ⇒ Object

Transforms an array of expressions containing literal name expressions to calls if followed by an expression, or expression list



183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 183

def transform_calls(expressions)
  # Factory transform raises an error if a non qualified name is followed by an argument list
  # since there is no way that that can be transformed back to sanity. This occurs in situations like this:
  #
  #  $a = 10, notice hello
  #
  # where the "10, notice" forms an argument list. The parser builds an Array with the expressions and includes
  # the comma tokens to enable the error to be reported against the first comma.
  #
  begin
    Factory.transform_calls(expressions)
  rescue Factory::ArgsToNonCallError => e
    # e.args[1] is the first comma token in the list
    # e.name_expr is the function name expression
    if e.name_expr.is_a?(Model::QualifiedName)
      error(e.args[1], "attempt to pass argument list to the function '#{e.name_expr.value}' which cannot be called without parentheses")
    else
      error(e.args[1], "illegal comma separated argument list")
    end
  end
end

#transform_resource_wo_title(left, resource, lbrace_token, rbrace_token) ⇒ Object

Transforms a LEFT followed by the result of attribute_operations, this may be a call or an invalid sequence



206
207
208
 
# File 'lib/puppet/pops/parser/parser_support.rb', line 206

def transform_resource_wo_title(left, resource, lbrace_token, rbrace_token)
  Factory.transform_resource_wo_title(left, resource, lbrace_token, rbrace_token)
end