aermicioi.aedi_property_reader.arg.inspector source code

1 /**
2 License:
3     Boost Software License - Version 1.0 - August 17th, 2003
4 
5     Permission is hereby granted, free of charge, to any person or organization
6     obtaining a copy of the software and accompanying documentation covered by
7     this license (the "Software") to use, reproduce, display, distribute,
8     execute, and transmit the Software, and to prepare derivative works of the
9     Software, and to permit third-parties to whom the Software is furnished to
10     do so, all subject to the following:
11 
12     The copyright notices in the Software and this entire statement, including
13     the above license grant, this restriction and the following disclaimer,
14     must be included in all copies of the Software, in whole or in part, and
15     all derivative works of the Software, unless such copies or derivative
16     works are solely in the form of machine-executable object code generated by
17     a source language processor.
18 
19     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20     IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21     FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
22     SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
23     FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
24     ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25     DEALINGS IN THE SOFTWARE.
26 
27 Authors:
28     Alexandru Ermicioi
29 **/
30 module aermicioi.aedi_property_reader.arg.inspector;
31 
32 import aermicioi.aedi_property_reader.core.inspector;
33 import std.algorithm;
34 import std.range;
35 import std.string;
36 
37 /**
38 Argument inspector that provides info about available properties in a command line field.
39 **/
40 class ArgumentInspector : Inspector!(const(string)[]) {
41 
42     /**
43     Identify the type of child field of component.
44 
45     Params:
46         component = a composite component (class, struct, assoc array etc.) containing some fields
47 
48     Returns:
49         Type of field, or typeid(void) if field is not present in component
50     **/
51     TypeInfo typeOf(const(string)[] component, in string property) const nothrow {
52         return typeid(const(string)[]);
53     }
54 
55     /**
56     Identify the type of component itself.
57 
58     Identify the type of component itself. It will inspect the component and will return accurate
59     type info that the component represents.
60 
61     Params:
62         component = component which should be identified.
63 
64     Returns:
65         Type info of component, or typeid(void) if component cannot be identified by inspector
66     **/
67     TypeInfo typeOf(const(string)[] component) const nothrow {
68         return typeid(const(string)[]);
69     }
70 
71     /**
72     Check if component has a field or a property.
73 
74     Params:
75         component = component with fields
76         property = component property that is tested for existence
77 
78     Returns:
79         true if field is present either in readonly, or writeonly form (has getters and setters).
80     **/
81     bool has(const(string)[] component, in string property) const nothrow {
82         try {
83 
84             return component.enumerate.filter!(
85                 (arg) {
86                     switch (property.commonPrefix("--")) {
87                         case "--": {
88                             return arg[1][2 .. $].splitter('=').front == property;
89                         }
90                         case "-": {
91                             return (arg[1][1 .. $].splitter('=').front == property) ||
92                                 (
93                                     (property.length == 1) && (arg[1].canFind(property[0]))
94                                 );
95                         }
96 
97                         default: {
98                             if (property.isNumeric) {
99                                 import std.conv : to;
100                                 return (arg[0] - 1) == property.to!size_t;
101                             }
102                         }
103 
104                         return false;
105                     }
106                 }
107             ).empty;
108         } catch (Exception e) {
109 
110         }
111 
112         return false;
113     }
114 
115     /**
116     Return a list of properties that component holds.
117 
118     Params:
119         component = the component with fields
120 
121     Returns:
122         an arary of property identities.
123     **/
124     string[] properties(const(string)[] component) const nothrow {
125 
126         try {
127 
128             return component.map!(
129                 (arg) {
130                     switch (arg.commonPrefix("--")) {
131                         case "--": {
132                             return [ arg[2 .. $].splitter('=').front ];
133                         }
134                         case "-": {
135                             import std.conv : to;
136                             return [ arg[1 .. $].splitter('=').front ] ~ arg[1 .. $].splitter('=').front.map!(to!string).array;
137                         }
138 
139                         default: {
140                             return cast(string[]) null;
141                         }
142                     }
143                 }
144             ).joiner.array;
145         } catch (Exception e) {
146 
147         }
148 
149         return [];
150     }
151 }