1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2012 Jean Privat <jean@pryen.org>
5 # Licensed under the Apache License, Version 2.0 (the "License");
6 # you may not use this file except in compliance with the License.
7 # You may obtain a copy of the License at
9 # http://www.apache.org/licenses/LICENSE-2.0
11 # Unless required by applicable law or agreed to in writing, software
12 # distributed under the License is distributed on an "AS IS" BASIS,
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 # See the License for the specific language governing permissions and
15 # limitations under the License.
17 # Parsing of literal values in the abstract syntax tree.
22 redef class ToolContext
23 var literal_phase
: Phase = new LiteralPhase(self, null)
26 private class LiteralPhase
29 redef fun process_nmodule
(nmodule
) do nmodule
.do_literal
(toolcontext
)
33 # Visit the module to compute the real value of the literal-related node of the AST.
34 # Warnings and errors are displayed on the toolcontext.
35 fun do_literal
(toolcontext
: ToolContext)
37 var v
= new LiteralVisitor(toolcontext
)
42 private class LiteralVisitor
45 var toolcontext
: ToolContext
47 init(toolcontext
: ToolContext)
49 self.toolcontext
= toolcontext
54 n
.accept_literal
(self)
60 private fun accept_literal
(v
: LiteralVisitor) do end
64 # The value of the literal int once computed.
65 var value
: nullable Int
68 redef class ADecIntExpr
69 redef fun accept_literal
(v
)
71 self.value
= self.n_number
.text
.to_i
75 redef class AHexIntExpr
76 redef fun accept_literal
(v
)
78 self.value
= self.n_hex_number
.text
.substring_from
(2).to_hex
82 redef class AFloatExpr
83 # The value of the literal float once computed.
84 var value
: nullable Float
85 redef fun accept_literal
(v
)
87 self.value
= self.n_float
.text
.to_f
92 # The value of the literal char once computed.
93 var value
: nullable Char
94 redef fun accept_literal
(v
)
96 var txt
= self.n_char
.text
.unescape_nit
97 if txt
.length
!= 3 then
98 v
.toolcontext
.error
(self.hot_location
, "Invalid character literal {txt}")
101 self.value
= txt
.chars
[1]
105 redef class AStringFormExpr
106 # The value of the literal string once computed.
107 var value
: nullable String
108 redef fun accept_literal
(v
)
110 var txt
= self.n_string
.text
113 if txt
.chars
[0] == txt
.chars
[1] and txt
.length
>= 6 then
116 if txt
.chars
[0] == '"' and txt
.chars
[3] == '\n' then behead
= 4 # ignore first \n in """
118 self.value
= txt
.substring
(behead
, txt
.length
- behead
- betail
).unescape_nit