blob: 8914166162ff49ddb09deb82d264aed9b76799b4 (
plain)
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
|
#include "utils.h"
#include "tree.h"
#include "exceptions.h"
#include <cctype>
namespace SimpleParser {
int8_t getPriority(char tmp) {
if ( std::isalpha(tmp) ) {
return 100;
} else {
switch ( tmp ) {
case '-':
return 10;
case '+':
return 10;
case '/':
return 20;
case '*':
return 20;
case '^':
return 30;
case '(':
return 90;
case ')':
return 90;
case ',':
return -1;
default:
return -1;
}
}
}
std::vector<std::string> lexer(std::string term) {
std::string tmp;
std::string tmpNumber;
std::string tmpIdentifier;
std::vector<std::string> output;
int8_t priority = 0;
int8_t lastPriority = 0;
uint32_t level = 0;
for ( auto termIter = term.begin();
termIter != term.end();
termIter++ ) {
priority = getPriority(*termIter);
if ( priority == -1 || priority == 100 || ( termIter == term.begin() &&
priority == 10 ) ) {
if ( level > 0 ) {
tmp += *termIter;
} else {
if ( priority == -1 ) {
tmpNumber += *termIter;
} else if ( priority == 100 ) {
tmpIdentifier += *termIter;
}
}
} else {
if ( level == 0 ) {
if ( lastPriority == -1 ) {
output.push_back(tmpNumber);
tmpNumber.clear();
} else if ( lastPriority == 100 ) {
output.push_back(tmpIdentifier);
tmpIdentifier.clear();
}
}
switch ( *termIter ) {
case '(': {
if ( level > 0 ) {
tmp += *termIter;
}
level++;
break;
}
case ')': {
level--;
if ( level == 0 ) {
output.push_back(tmp);
tmp.clear();
} else {
tmp += *termIter;
}
break;
}
default: {
if ( level == 0 ) {
std::string helper;
helper = *termIter;
output.push_back(helper);
} else {
tmp += *termIter;
}
break;
}
}
}
lastPriority = priority;
}
if ( lastPriority == -1 ) {
output.push_back(tmpNumber);
} else if ( lastPriority == 100 ) {
output.push_back(tmpIdentifier);
} else if ( lastPriority != 90 ) {
throw operator_exception();
}
if ( level != 0 ) {
throw parenthese_exception();
}
if ( lastPriority == 90 && output.size() == 1 ) {
output = lexer(output[0]);
}
return output;
}
}
|
