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
|
package juloo.keyboard2;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
Parse a key definition. The syntax for a key definition is:
- [:(kind) (attributes):(payload)].
- If [str] doesn't start with a [:] character, it is interpreted as an
arbitrary string key.
[(kind)] specifies the kind of the key, it can be:
- [str]: An arbitrary string key. The payload is the string to output when
typed and is quoted by single quotes ([']). The payload can contain single
quotes if they are escaped with a backslash ([\']).
The [(attributes)] part is a space-separated list of attributes, all optional,
of the form: [attrname='attrvalue'].
Attributes can be:
- [flags]: Add flags that change the behavior of the key.
Value is a coma separated list of:
- [dim]: Make the symbol dimmer on the keyboard.
- [small]: Make the symbol smaller on the keyboard.
- [symbol]: Specify the symbol that is rendered on the keyboard.
It can contain single quotes if they are escaped: ([\']).
Examples:
- [:str flags=dim,small symbol='MyKey':'My arbitrary string'].
- [:str:'My arbitrary string'].
*/
public final class KeyValueParser
{
static Pattern START_PAT;
static Pattern ATTR_PAT;
static Pattern QUOTED_PAT;
static Pattern PAYLOAD_START_PAT;
static public KeyValue parse(String str) throws ParseError
{
String symbol = null;
int flags = 0;
init();
// Kind
Matcher m = START_PAT.matcher(str);
if (!m.lookingAt())
parseError("Expected kind, for example \":str ...\".", m);
String kind = m.group(1);
// Attributes
while (true)
{
if (!match(m, ATTR_PAT))
break;
String attr_name = m.group(1);
String attr_value = parseSingleQuotedString(m);
switch (attr_name)
{
case "flags":
flags = parseFlags(attr_value, m);
break;
case "symbol":
symbol = attr_value;
break;
default:
parseError("Unknown attribute "+attr_name, m);
}
}
// Payload
if (!match(m, PAYLOAD_START_PAT))
parseError("Unexpected character", m);
switch (kind)
{
case "str":
String payload = parseSingleQuotedString(m);
if (symbol == null)
return KeyValue.makeStringKey(payload, flags);
return KeyValue.makeStringKeyWithSymbol(payload, symbol, flags);
default: break;
}
parseError("Unknown kind '"+kind+"'", m, 1);
return null; // Unreachable
}
static String parseSingleQuotedString(Matcher m) throws ParseError
{
if (!match(m, QUOTED_PAT))
parseError("Expected quoted string", m);
return m.group(1).replace("\\'", "'");
}
static int parseFlags(String s, Matcher m) throws ParseError
{
int flags = 0;
for (String f : s.split(","))
{
switch (f)
{
case "dim": flags |= KeyValue.FLAG_SECONDARY; break;
case "small": flags |= KeyValue.FLAG_SMALLER_FONT; break;
default: parseError("Unknown flag "+f, m);
}
}
return flags;
}
static boolean match(Matcher m, Pattern pat)
{
try { m.region(m.end(), m.regionEnd()); } catch (Exception _e) {}
m.usePattern(pat);
return m.lookingAt();
}
static void init()
{
if (START_PAT != null)
return;
START_PAT = Pattern.compile(":(\\w+)");
ATTR_PAT = Pattern.compile("\\s*(\\w+)\\s*=");
QUOTED_PAT = Pattern.compile("'(([^'\\\\]+|\\\\')*)'");
PAYLOAD_START_PAT = Pattern.compile("\\s*:");
}
static void parseError(String msg, Matcher m) throws ParseError
{
parseError(msg, m, m.regionStart());
}
static void parseError(String msg, Matcher m, int i) throws ParseError
{
StringBuilder msg_ = new StringBuilder("Syntax error");
try
{
char c = m.group(0).charAt(0);
msg_.append(" at character '").append(c).append("'");
} catch (IllegalStateException _e) {}
msg_.append(" at position ");
msg_.append(i);
msg_.append(": ");
msg_.append(msg);
throw new ParseError(msg_.toString());
}
public static class ParseError extends Exception
{
public ParseError(String msg) { super(msg); }
};
}
|
