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
|
/*
Ousía
Copyright (C) 2014, 2015 Benjamin Paaßen, Andreas Stöckel
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sstream>
#include "ParserStack.hpp"
#include <core/Utils.hpp>
#include <core/Exceptions.hpp>
namespace ousia {
namespace parser {
/* Class Handler */
void Handler::data(const std::string &data, int field)
{
for (auto &c : data) {
if (!Utils::isWhitespace(c)) {
throw LoggableException{"No data allowed here."};
}
}
}
/* Class HandlerDescriptor */
HandlerInstance HandlerDescriptor::create(const ParserContext &ctx,
std::string name, State parentState,
bool isChild,
const Variant &args) const
{
Handler *h = ctor(ctx, name, targetState, parentState, isChild);
h->start(args);
return HandlerInstance(h, this);
}
/* Class ParserStack */
/**
* Returns an Exception that should be thrown when a currently invalid command
* is thrown.
*/
static LoggableException invalidCommand(const std::string &name,
const std::set<std::string> &expected)
{
if (expected.empty()) {
return LoggableException{
std::string{"No nested elements allowed, but got \""} + name +
std::string{"\""}};
} else {
return LoggableException{
std::string{"Expected "} +
(expected.size() == 1 ? std::string{"\""}
: std::string{"one of \""}) +
Utils::join(expected, "\", \"") + std::string{"\", but got \""} + name +
std::string{"\""}};
}
}
std::set<std::string> ParserStack::expectedCommands(State state)
{
std::set<std::string> res;
for (const auto &v : handlers) {
if (v.second.parentStates.count(state)) {
res.insert(v.first);
}
}
return res;
}
void ParserStack::start(std::string name, const Variant &args)
{
// Fetch the current handler and the current state
const HandlerInstance *h = stack.empty() ? nullptr : &stack.top();
const State curState = currentState();
bool isChild = false;
// Fetch the correct Handler descriptor for this
const HandlerDescriptor *descr = nullptr;
auto range = handlers.equal_range(name);
for (auto it = range.first; it != range.second; it++) {
const std::set<State> &parentStates = it->second.parentStates;
if (parentStates.count(curState) || parentStates.count(STATE_ALL)) {
descr = &(it->second);
break;
}
}
if (!descr && currentArbitraryChildren()) {
isChild = true;
descr = h->descr;
}
// No descriptor found, throw an exception.
if (!descr) {
throw invalidCommand(name, expectedCommands(curState));
}
// Instantiate the handler and call its start function
stack.emplace(descr->create(ctx, name, curState, isChild, args));
}
void ParserStack::end()
{
// Check whether the current command could be ended
if (stack.empty()) {
throw LoggableException{"No command to end."};
}
// Remove the current HandlerInstance from the stack
HandlerInstance inst{stack.top()};
stack.pop();
// Call the end function of the last Handler
inst.handler->end();
// Call the "child" function of the parent Handler in the stack
// (if one exists).
if (!stack.empty()) {
stack.top().handler->child(inst.handler);
}
}
void ParserStack::data(const std::string &data, int field)
{
// Check whether there is any command the data can be sent to
if (stack.empty()) {
throw LoggableException{"No command to receive data."};
}
// Pass the data to the current Handler instance
stack.top().handler->data(data, field);
}
}
}
|
