Class: GitlabZOQL::Parser

Inherits:
Racc::Parser
  • Object
show all
Defined in:
lib/gitlab-zoql/parser/parser.rex.rb,
lib/gitlab-zoql/parser/parser.racc.rb

Overview

-*- fill-column: 30; -*-

Defined Under Namespace

Modules: Statement Classes: ScanError

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 = 
[
"$end",
"error",
"SELECT",
"FROM",
"WHERE",
"identifier",
"OR",
"AND",
"not_equals_operator",
"NULL",
"equals_operator",
"less_than_operator",
"greater_than_operator",
"less_than_or_equals_operator",
"greater_than_or_equals_operator",
"plus_sign",
"minus_sign",
"asterisk",
"solidus",
"sign",
"general_value_specification",
"comma",
"quote",
"character_string_literal",
"DATETIME",
"datetime_string",
"unsigned_integer",
"period",
"$start",
"direct_sql_statement",
"direct_sql_data_statement",
"direct_select_statement_multiple_rows",
"query_expression",
"query_specification",
"select_list",
"table_expression",
"select_sublist",
"column_name",
"column_name_list",
"value_expression",
"from_clause",
"where_clause",
"table_reference",
"table_name",
"search_condition",
"boolean_term",
"boolean_factor",
"predicate",
"null_predicate",
"comparison_predicate",
"numeric_value_expression",
"general_literal",
"term",
"factor",
"value_expression_primary",
"unsigned_value_specification",
"unsigned_literal",
"unsigned_numeric_literal",
"datetime_literal",
"exact_numeric_literal" ]
Racc_debug_parser = 
false

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#filename ⇒ Object (readonly)

Returns the value of attribute filename.



16
17
18
 
# File 'lib/gitlab-zoql/parser/parser.rex.rb', line 16

def filename
  @filename
end

#lineno ⇒ Object (readonly)

Returns the value of attribute lineno.



15
16
17
 
# File 'lib/gitlab-zoql/parser/parser.rex.rb', line 15

def lineno
  @lineno
end

#state ⇒ Object

Returns the value of attribute state.



17
18
19
 
# File 'lib/gitlab-zoql/parser/parser.rex.rb', line 17

def state
  @state
end

Instance Method Details

#_next_token ⇒ Object 



56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
 
# File 'lib/gitlab-zoql/parser/parser.rex.rb', line 56

def _next_token
  text = @ss.peek(1)
  @lineno  +=  1  if text == "\n"
  token = case @state
    when nil
  case
          when (text = @ss.scan(/\'/i))
             action { @state = :STRS;  [:quote, text] }

          when (text = @ss.scan(/[0-9]+/i))
             action { [:unsigned_integer, text.to_i] }

          when (text = @ss.scan(/\s+/i))
            ;

          when (text = @ss.scan(/AND\b/i))
             action { [:AND, text] }

          when (text = @ss.scan(/COUNT\b/i))
             action { [:COUNT, text] }

          when (text = @ss.scan(/ELSE\b/i))
             action { [:ELSE, text] }

          when (text = @ss.scan(/FROM\b/i))
             action { [:FROM, text] }

          when (text = @ss.scan(/NULL\b/i))
             action { [:NULL, text] }

          when (text = @ss.scan(/OR\b/i))
             action { [:OR, text] }

          when (text = @ss.scan(/SELECT\b/i))
             action { [:SELECT, text] }

          when (text = @ss.scan(/WHERE\b/i))
             action { [:WHERE, text] }

          when (text = @ss.scan(/!=/i))
             action { [:not_equals_operator, text] }

          when (text = @ss.scan(/=/i))
             action { [:equals_operator, text] }

          when (text = @ss.scan(/<=/i))
             action { [:less_than_or_equals_operator, text] }

          when (text = @ss.scan(/</i))
             action { [:less_than_operator, text] }

          when (text = @ss.scan(/>=/i))
             action { [:greater_than_or_equals_operator, text] }

          when (text = @ss.scan(/>/i))
             action { [:greater_than_operator, text] }

          when (text = @ss.scan(/,/i))
             action { [:comma, text] }

          when (text = @ss.scan(/\w+/i))
             action { [:identifier, text] }

          when (text = @ss.scan(/----/i))
            ;

          when (text = @ss.scan(/require/i))
            ;

  
  else
    text = @ss.string[@ss.pos .. -1]
    raise  ScanError, "can not match: '" + text + "'"
  end  # if

    when :STRS
  case
          when (text = @ss.scan(/[0-9]+-[0-9]+-[0-9]+T[0-9]+:[0-9]+:[0-9]+\+[0-9]+:[0-9]+/i))
             action { [:datetime_string, DateTime.parse(text)] }

          when (text = @ss.scan(/(?:[^\\']|\\.|'')+/i))
             action {                  [:character_string_literal, text] }

          when (text = @ss.scan(/\'/i))
             action { @state = nil;    [:quote, text] }

  
  else
    text = @ss.string[@ss.pos .. -1]
    raise  ScanError, "can not match: '" + text + "'"
  end  # if

else
  raise  ScanError, "undefined state: '" + state.to_s + "'"
end  # case state
  token
end

#_reduce_none(val, _values, result) ⇒ Object 



599
600
601
 
# File 'lib/gitlab-zoql/parser/parser.racc.rb', line 599

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

#action ⇒ Object 



25
26
27
 
# File 'lib/gitlab-zoql/parser/parser.rex.rb', line 25

def action
  yield
end

#load_file(filename) ⇒ Object 



35
36
37
38
39
40
 
# File 'lib/gitlab-zoql/parser/parser.rex.rb', line 35

def load_file( filename )
  @filename = filename
  File.open(filename, "r") do |f|
    scan_setup(f.read)
  end
end

#next_token ⇒ Object 



48
49
50
51
52
53
54
 
# File 'lib/gitlab-zoql/parser/parser.rex.rb', line 48

def next_token
  return if @ss.eos?

  # skips empty actions
  until token = _next_token or @ss.eos?; end
  token
end

#scan_file(filename) ⇒ Object 



42
43
44
45
 
# File 'lib/gitlab-zoql/parser/parser.rex.rb', line 42

def scan_file( filename )
  load_file(filename)
  do_parse
end

#scan_setup(str) ⇒ Object 



19
20
21
22
23
 
# File 'lib/gitlab-zoql/parser/parser.rex.rb', line 19

def scan_setup(str)
  @ss = StringScanner.new(str)
  @lineno =  1
  @state  = nil
end

#scan_str(str) ⇒ Object Also known as: scan 



29
30
31
32
 
# File 'lib/gitlab-zoql/parser/parser.rex.rb', line 29

def scan_str(str)
  scan_setup(str)
  do_parse
end