blob: d343b80dde34e461366a208fddbf7b4a618f1035 (
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
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
|
package Compiler;
import java.util.ArrayList;
import java.util.List;
import Compiler.Expression.*;
import Compiler.Statement.*;
public class Translator{
List<String> CCode = new ArrayList<>();
private Environment environment = new Environment();
public List<String> compileToC(List<Statement> statements){
CCode.add("#include <stdio.h>");
CCode.add("#include <string.h>");
CCode.add("int main(){");
try{
for (Statement statement: statements){
evaluateStatement(statement);
}
} catch (Error e){
}
CCode.add("}");
for(String t:CCode){
System.out.println(t);
}
System.out.println("");
return CCode;
}
private void evaluateStatement(Statement statement){
switch(statement.getStatmentType()){
case "exprStmt":
evalExpressionStatement((ExpressionStatement)statement);
break;
case "varDec":
evalVariableDeclaration((VariableDeclaration)statement);
break;
case "stringDec":
evalStringDeclaration((StringDeclaration)statement);
break;
case "print":
evalPrintStatement((PrintStatement)statement);
break;
case "ifStmt":
evalIfStatement((IfStatement)statement);
break;
}
}
private void evalExpressionStatement(ExpressionStatement stmt){
evaluateExpression(stmt.expr);
}
private void evalStringDeclaration(StringDeclaration stringdec){
environment.defineVariable(stringdec.name.text, "string");
int size = (int)((Expression.Literal)stringdec.length).value.value;
size++;
CCode.add("char "+stringdec.name.text+"["+size+"];");
}
private void evalVariableDeclaration(VariableDeclaration vardec){
environment.defineVariable(vardec.name.text, vardec.type);
if(vardec.type.equals("int")){
CCode.add("int "+vardec.name.text+";");
} else if(vardec.type.equals("real")){
CCode.add("float "+vardec.name.text+";");
}
}
private void evalPrintStatement(PrintStatement print){
String types="";
String values="";
boolean first=true;
for(Expression expr:print.exprList){
if(!first){
values+=",";
}else{
first=false;
}
String exprType="";
if(expr instanceof Expression.Literal){
exprType=((Expression.Literal)expr).type;
}
else if (expr instanceof Expression.Variable){
exprType=(String)environment.getVariable((((Expression.Variable)expr).name).text);
}
if (exprType.equals("int")){
types+="%d";
} else if (exprType.equals("double")){
types+="%f";
} else if (exprType.equals("string")){
types+="%s";
}
values+=evaluateExpression(expr);
}
CCode.add("printf(\""+types+"\","+values+");");
}
private void evalIfStatement(IfStatement ifstatement){
CCode.add("if("+evaluateExpression(ifstatement.condition)+"){");
for(Statement s:ifstatement.statements) {
evaluateStatement(s);
}
if(ifstatement.elseStatements.size()>0){
CCode.add("}");
CCode.add("else {");
for(Statement s:ifstatement.elseStatements) {
evaluateStatement(s);
}
}
CCode.add("}");
}
private String evaluateExpression(Expression expression){
switch(expression.getExpressionType()){
case "binary":
return evaluateBinaryExpression((Binary)expression);
case "literal":
return evaluateLiteralExpression((Literal)expression);
case "bracket":
return evaluateBracketedExpression((BracketedExpression)expression);
case "assign":
evaluateAssignmentExpression((AssignmentExpression)expression);
return "";
case "var":
return evaluateVariableExpression((Variable)expression);
default:
return null;
}
}
private String evaluateBinaryExpression(Binary expr){
switch (expr.op.type){
case PLUS:
//return "leftEval+rightEval"
return evaluateExpression(expr.left)+"+"+evaluateExpression(expr.right);
case STAR:
return evaluateExpression(expr.left)+"*"+evaluateExpression(expr.right);
case MINUS:
return evaluateExpression(expr.left)+"-"+evaluateExpression(expr.right);
case SLASH:
return evaluateExpression(expr.left)+"/"+evaluateExpression(expr.right);
case GREATER:
return evaluateExpression(expr.left)+">"+evaluateExpression(expr.right);
case LESS:
return evaluateExpression(expr.left)+"<"+evaluateExpression(expr.right);
case EQUALITY:
return evaluateExpression(expr.left)+"=="+evaluateExpression(expr.right);
default:
break;
}
return null;
}
private String evaluateLiteralExpression(Literal expr){
return (expr.value.value).toString();
}
private String evaluateBracketedExpression(BracketedExpression expr){
return evaluateExpression(expr.expr);
}
private void evaluateAssignmentExpression(AssignmentExpression expr){
if(expr.value instanceof Expression.Literal){
if(((Expression.Literal)expr.value).type.equals("string")){
CCode.add("strcpy("+expr.name.text+","+evaluateExpression(expr.value)+");");
}
}
else{
CCode.add(expr.name.text+"="+evaluateExpression(expr.value)+";");
}
}
private String evaluateVariableExpression(Variable expr){
return expr.name.text;
}
}
|
