1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
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
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
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
%token <string>IDENT
%token L_PAREN
%token R_PAREN
%token L_BRACKET R_BRACKET
%token COLUMN
%token DOT
%token <string>LITERAL
%token <string>INTEGER
%token COMA
%token EOF
%token CONCAT_OPERATOR
%token <ImportExpression.T.binary_operator>BINARY_OPERATOR
%token <ImportExpression.T.binary_operator>INEQUALITY_OPERATOR
%token <ImportExpression.T.binary_operator>EQUALITY_OPERATOR
%token <ImportExpression.T.binary_operator>BOOL_OPERATOR
%start <ImportDataTypes.Path.t ImportExpression.T.t> path_expr
%start <ImportDataTypes.Path.column ImportExpression.T.t> column_expr
%right BOOL_OPERATOR
%right INEQUALITY_OPERATOR EQUALITY_OPERATOR
%right CONCAT_OPERATOR BINARY_OPERATOR
%%
path_expr:
| expr_(path_, EOF) EOF { $1 }
| EOF { ImportExpression.T.Empty }
column_expr:
| expr_(column_, EOF) EOF { $1 }
| EOF { ImportExpression.T.Empty }
path_:
| COLUMN
column = IDENT
{ ImportExpression.T.Path
Syntax.Path.{ alias = None
; column = ImportCSV.Csv.column_of_string column
}
}
| COLUMN
table = IDENT
DOT
column = IDENT
{ ImportExpression.T.Path
Syntax.Path.{ alias = Some table
; column = ImportCSV.Csv.column_of_string column}
}
column_:
| COLUMN
column = IDENT
{ try ImportExpression.T.Path (ImportCSV.Csv.column_of_string column)
with _ -> ImportExpression.T.Literal column }
arguments(PATH):
| L_PAREN
expr = separated_list(COMA, expr_(PATH, COMA))
R_PAREN
{ expr }
group(PATH):
| L_BRACKET
expr = separated_list(COMA, expr_(PATH, COMA))
R_BRACKET
{ expr }
fixed(PATH):
| d = INTEGER
{ ImportExpression.T.Integer d }
| l = LITERAL
{
if String.equal String.empty l then
ImportExpression.T.Empty
else
ImportExpression.T.Literal l
}
%inline boperator:
| e = BINARY_OPERATOR { e }
| e = INEQUALITY_OPERATOR { e }
| e = EQUALITY_OPERATOR { e }
| e = BOOL_OPERATOR { e }
(* The expression evaluation receveive in parameters :
1. the way to buidl a path, as we have two distinct ways to build them in
the case of externals (the external_key does not allow a table name)
2. a phantom type telling wich kind of element will end the expression.
This can be EOF for the root expression, or COMA when inside a function.
This prevent merlin to optimize thoses two path, and allow more precise
error messages. *)
expr_(PATH, ENDING_PHANTOM):
| L_PAREN
e = expr_(PATH, R_PAREN)
R_PAREN
{ ImportExpression.T.Expr e
}
|
p1 = expr_(PATH, ENDING_PHANTOM)
CONCAT_OPERATOR
p2 = expr_(PATH, COMA)
{ match p2 with
| ImportExpression.T.Concat args -> ImportExpression.T.Concat (p1::args)
| _ -> ImportExpression.T.Concat (p1::p2::[])
}
| p1 = expr_(PATH, ENDING_PHANTOM)
op = boperator
p2 = expr_(PATH, COMA)
{ ImportExpression.T.BOperator (op, p1, p2) }
| p1 = expr_(PATH, ENDING_PHANTOM)
op = EQUALITY_OPERATOR
p2 = group(PATH)
{ ImportExpression.T.GEquality(op, p1, p2) }
| p = PATH
{ p }
| f = fixed(PATH)
{ f }
| s = IDENT
args = arguments(PATH)
{ ImportExpression.T.function_of_name args s }
|
s = IDENT
L_PAREN
opt_arg = opt_arg(PATH, COMA)?
args1 = group(PATH)
COMA
args2 = group(PATH)
R_PAREN
{ let window_name = ImportExpression.T.window_of_name s opt_arg in
ImportExpression.T.Window (window_name, args1, args2) }
(*
| (* This case is here to describe a window function which has 2 arguments
level.
I’m not completely satisfied with it, as it prevent the ability to
create a exprpression block with parens arround. *)
s = IDENT
L_PAREN
opt_arg = opt_arg(PATH, COMA)?
args1 = arguments(PATH)
COMA
args2 = arguments(PATH)
R_PAREN
{ let window_name = ImportExpression.T.window_of_name s opt_arg in
let expr = ImportExpression.T.Window (window_name, args1, args2) in
let expr_repr = ImportExpression.Repr.repr ~top:true (fun _ -> "")
expr in
Printf.printf "Deprecated syntax in \"%s\" use [] instead of ()\n" expr_repr;
expr
}
*)
opt_arg(PATH, SEP):
| expr = expr_(PATH, COMA)
SEP
{ expr }
|
