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Copy pathBackend.java
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56 lines (47 loc) · 1.63 KB
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package com.fun;
import lombok.extern.slf4j.Slf4j;
import java.util.Objects;
@Slf4j
public class Backend {
private Parser parser;
public Backend() {
this.parser = new Parser();
}
public void execute(String code) {
GlobalVariables g = new GlobalVariables();
SourceCode ast = this.parser.parse(code);
resolveAst(g,ast);
}
private void resolveAst(GlobalVariables g, SourceCode ast) {
if (ast.getStatements().size() == 0) {
log.error("resolveAST error");
System.exit(1);
}
for (Statement statement: ast.getStatements()
) {
resolveStatement(g, statement);
}
}
private void resolveStatement(GlobalVariables g, Statement statement) {
if (statement instanceof Assignment) {
resolveAssignment(g, (Assignment) statement);
} else if (statement instanceof Print) {
resolvePrint(g, (Print) statement);
} else {
log.error("undefined statement type");
System.exit(-1);
}
}
private void resolvePrint(GlobalVariables g, Print print) {
String variableName = print.getVariable().getName();
if (Objects.isNull(variableName) || Objects.equals("", variableName)) {
log.error("resolve print error");
System.exit(-1);
}
String variableValue = g.getVariables().get(variableName);
log.info(variableValue);
}
private void resolveAssignment(GlobalVariables g, Assignment assignment) {
g.getVariables().put(assignment.getVariable().getName(), assignment.getValue());
}
}