-
Notifications
You must be signed in to change notification settings - Fork 0
/
minibasic.cpp
212 lines (203 loc) · 7.06 KB
/
minibasic.cpp
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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
#include "minibasic.h"
void MiniBasic::setCode(size_t line, const QString &code) {
QList<Token *> tokenList;
Statement *statement = nullptr;
QString error;
std::function<void()> procedure;
QStringList tree;
try { statement = parser(tokenList = scan(code)); }
catch (QPair<QList<Token *>, ScanError> scanError) {
tokenList = scanError.first;
error = scanError.second.what();
}
catch (ParserError parserError) { error = parserError.what(); }
if (!error.isEmpty()) {
errorList[line] = error;
procedure = [] { throw RuntimeError("exist syntax error."); };
tree = QStringList{ makeFont(errorColor, "error:") + " " + error };
} else {
errorList.remove(line);
procedure = generateProcedure(statement);
tree = statement ? statement->toHTML() : QStringList{ "" };
}
auto iter = lineList.find(line);
if (iter != lineList.end()) {
delete iter->statement;
iter.value() = { toHTML(tokenList), tree, statement, procedure };
} else { lineList[line] = { toHTML(tokenList),tree,statement,procedure }; }
clearTokenList(tokenList);
if (!error.isEmpty()) { throw error; }
}
void MiniBasic::removeCode(size_t line) {
auto iter = lineList.find(line);
if (iter == lineList.end()) { throw QString("no such line."); }
delete iter->statement;
lineList.erase(iter);
errorList.remove(line);
}
void MiniBasic::loadCode(const QString &filename) {
QFile *file = new QFile(filename);
if (!file->open(QIODevice::ReadOnly | QIODevice::Text)) { throw QString("no such file."); }
QString code;
size_t line;
bool isNum;
while (!file->atEnd()) {
code = file->readLine().trimmed();
line = code.section(' ', 0, 0).toLongLong(&isNum);
if (!isNum) { continue; }
code = code.section(' ', 1).trimmed();
if (code.isEmpty()) {
try { removeCode(line); }
catch (QString error) {}
} else {
try { setCode(line, code); }
catch (QString error) {}
}
}
file->close();
}
void MiniBasic::run() {
if (!errorList.isEmpty()) { throw QString("exist syntax error, can't run."); }
for (auto &line : lineList) { if (line.statement) { line.statement->zeroOut(); } }
running = true;
evaluationState.clear();
currentPosition = lineList.begin();
while (running && currentPosition != lineList.end()) {
try { currentPosition->procedure(); }
catch (RuntimeError error) {
running = false;
throw makeFont(lineNumberColor, "line " + QString::number(currentPosition.key()) + ": ")
+ error.what();
}
}
kill();
}
void MiniBasic::clearCode() {
for (auto &line : lineList) { delete line.statement; }
lineList.clear();
errorList.clear();
currentPosition = lineList.begin();
running = false;
}
QStringList MiniBasic::codeHTML() {
QStringList code;
if (lineList.empty()) { return code; }
size_t maxLength = QString::number(lineList.lastKey()).length();
QString line;
for (auto it = lineList.begin(); it != lineList.end(); ++it) {
line = QString::number(it.key());
line = makeFont(lineNumberColor, QString(maxLength - line.length(), '0') + line) + " ";
code.append(line + it->code);
}
return code;
}
QStringList MiniBasic::treeHTML() {
QStringList trees, tree;
if (lineList.empty()) { return trees; }
size_t maxLength = QString::number(lineList.lastKey()).length();
QString line;
for (auto it = lineList.begin(); it != lineList.end(); ++it) {
line = QString::number(it.key());
line = makeFont(lineNumberColor, QString(maxLength - line.length(), '0') + line) + " ";
tree = it->tree;
tree[0].push_front(line);
if (it->statement) {
switch (it->statement->type) {
case STATEMENT_REM:
break;
case STATEMENT_LET:
tree[0].push_back(" " + makeFont(treeColor[TREE_STATEMENT_COUNT],
QString::number(((LetStatement *)it->statement)->count))
);
tree[1].push_back(" " + makeFont(treeColor[TREE_VARIABLE_COUNT],
QString::number(evaluationState.getCount(((LetStatement *)it->statement)->variable)))
);
break;
case STATEMENT_PRINT:
tree[0].push_back(" " + makeFont(treeColor[TREE_STATEMENT_COUNT],
QString::number(((PrintStatement *)it->statement)->count))
);
break;
case STATEMENT_INPUT:
tree[0].push_back(" " + makeFont(treeColor[TREE_STATEMENT_COUNT],
QString::number(((InputStatement *)it->statement)->count))
);
tree[1].push_back(" " + makeFont(treeColor[TREE_VARIABLE_COUNT],
QString::number(evaluationState.getCount(((InputStatement *)it->statement)->variable)))
);
break;
case STATEMENT_GOTO:
tree[0].push_back(" " + makeFont(treeColor[TREE_STATEMENT_COUNT],
QString::number(((GotoStatement *)it->statement)->count) + "</font>")
);
break;
case STATEMENT_IF:
tree[0].push_back(" " + makeFont(treeColor[TREE_STATEMENT_COUNT],
QString::number(((IfStatement *)it->statement)->ifCount) + " " +
QString::number(((IfStatement *)it->statement)->thenCount))
);
break;
case STATEMENT_END:
tree[0].push_back(" " + makeFont(treeColor[TREE_STATEMENT_COUNT],
QString::number(((EndStatement *)it->statement)->count) + "</font>")
);
break;
}
}
trees.append(tree);
}
return trees;
}
std::function<void()> MiniBasic::generateProcedure(Statement *statement) {
if (!statement) { return [this] { ++currentPosition; }; }
switch (statement->type) {
case STATEMENT_REM:
return [this] { ++currentPosition; };
case STATEMENT_LET:
return [this, statement] {
++((LetStatement *)statement)->count;
qint64 value;
try { value = evaluationState.getValue(((LetStatement *)statement)->expression); }
catch (QString errorList) { throw errorList; }
evaluationState.setValue(((LetStatement *)statement)->variable, value);
++currentPosition;
};
case STATEMENT_PRINT:
return [this, statement] {
++((PrintStatement *)statement)->count;
qint64 value;
try { value = evaluationState.getValue(((PrintStatement *)statement)->expression); }
catch (QString errorList) { throw errorList; }
print(value);
++currentPosition;
};
case STATEMENT_INPUT:
return [this, statement] {
++((InputStatement *)statement)->count;
evaluationState.setValue(((InputStatement *)statement)->variable, input());
++currentPosition;
};
case STATEMENT_GOTO:
return [this, statement] {
++((GotoStatement *)statement)->count;
currentPosition = lineList.find(((GotoStatement *)statement)->destination);
if (currentPosition == lineList.end()) { throw QString("goto invalid line."); }
};
case STATEMENT_IF:
return [this, statement] {
++((IfStatement *)statement)->ifCount;
qint64 condition;
try { condition = evaluationState.getValue(((IfStatement *)statement)->condition); }
catch (QString errorList) { throw errorList; }
if (!condition) { ++currentPosition; return; }
++((IfStatement *)statement)->thenCount;
currentPosition = lineList.find(((IfStatement *)statement)->destination);
if (currentPosition == lineList.end()) { throw QString("goto invalid line."); }
};
case STATEMENT_END:
return [this, statement] {
++((EndStatement *)statement)->count;
currentPosition = lineList.end();
};
}
}