-
Notifications
You must be signed in to change notification settings - Fork 0
/
in.c
149 lines (104 loc) · 3.33 KB
/
in.c
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
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "in.h"
#include "rpn.h"
#include "stack.h"
#include "utility.h"
double in_eval(char *exp) {
int exp_length = strlen(exp), numOfVars = 0;
struct operator_stack *os = create_operator_stack(exp_length / 2);
char *token, *copy, *vars[10] = {NULL}, rpn_exp[1024] = "";
double value = 0;
copy = (char *) malloc(sizeof(char) * exp_length);
strcpy(copy, exp);
token = strtok(copy, " ");
bool previousIsOperator = false,
previousIsLeftParenthese = false,
varsSet = false;
while (token != NULL) {
errorOccurs = true;
varsSet = false;
if (isNumeric(token) && sscanf(token, "%lf", &value) > 0) {
if (!(strlen(rpn_exp) == 0 || previousIsOperator || previousIsLeftParenthese)) return value;
for (int i = 0; i < numOfVars; i++) {
setVariable(vars[i], value);
vars[i] = NULL;
varsSet = true;
}
numOfVars = 0;
errorOccurs = false;
previousIsOperator = false;
previousIsLeftParenthese = false;
concat_double(rpn_exp, value);
} else if (variableValid(token)) {
if (!(strlen(rpn_exp) == 0 || previousIsOperator
|| previousIsLeftParenthese)) return value;
char operator = *(token + strlen(token) + 1);
if (operator == '=') {
vars[numOfVars++] = token;
errorOccurs = false;
} else {
value = getVariable(token);
errorOccurs = !variableExists(token);
concat_double(rpn_exp, value);
}
previousIsOperator = false;
previousIsLeftParenthese = false;
} else if (isOperator(token) || isParenthese(token)) {
if ((isOperator(token) && previousIsOperator)
|| (strcmp(token, ")") == 0 && strlen(rpn_exp) == 0)) return value;
if (numOfVars > 0) return value;
char *op = NULL;
if (strcmp(token, "(") == 0) {
push_operator(os, token);
previousIsLeftParenthese = true;
} else if (strcmp(token, ")") == 0) {
op = peek_operator(os);
if (strcmp(op, "(") == 0) return value;
op = pop_operator(os);
while (strcmp(op, "(") != 0) {
if (strcmp(op, ")") == 0) return value;
concat_operator(rpn_exp, op);
op = pop_operator(os);
}
previousIsLeftParenthese = false;
} else {
int pre1 = -1, pre2 = getOperatorPrecedence(token);
if (os->top > -1) pre1 = getOperatorPrecedence(peek_operator(os));
while (pre2 > pre1 && pre1 > 0 && os->top > -1) {
concat_operator(rpn_exp, pop_operator(os));
if (os->top > -1) pre1 = getOperatorPrecedence(peek_operator(os));
}
push_operator(os, token);
previousIsOperator = true;
previousIsLeftParenthese = false;
}
errorOccurs = false;
} else if (strcmp(token, "=") == 0) {
errorOccurs = false;
} else {
return value;
}
if (errorOccurs) return value;
token = strtok(NULL, " ");
}
while (os->top > -1) concat_operator(rpn_exp, pop_operator(os));
free(copy);
free_operator_stack(os);
if (!(varsSet || errorOccurs)) value = rpn_eval(rpn_exp);
return value;
}
void concat_double(char *str, double val) {
char val_str[255];
sprintf(val_str, "%lf", val);
concat_rpn(str, val_str);
}
void concat_operator(char *str, char *op) {
concat_rpn(str, op);
}
void concat_rpn(char *str, char *exp) {
if (strlen(str) > 0) strcat(str, " ");
strncat(str, exp, strlen(exp));
}