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https://github.com/ChronosX88/old-java-education-stuff.git
synced 2024-11-09 11:31:00 +00:00
Implement expression computation by AST in StringCalc
This commit is contained in:
ChronosX88
parent
244099760e
commit
d282ea8b8c
GPG Key ID:
085A69A82C8C511A
1
StringCalc/.gitignore
vendored
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1
StringCalc/.gitignore
vendored
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out/
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<entry name="!?*.groovy" />
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<entry name="!?*.scala" />
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<entry name="!?*.flex" />
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<entry name="!?*.kt" />
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<entry name="!?*.clj" />
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<html>Simple <b>Java</b> application that includes a class with <code>main()</code> method</html>
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@ -1,12 +1,6 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
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<modules>
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<module fileurl="file://$PROJECT_DIR$/UnnamedCalc.iml" filepath="$PROJECT_DIR$/UnnamedCalc.iml" />
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<module fileurl="file://$PROJECT_DIR$/StringCalc.iml" filepath="$PROJECT_DIR$/StringCalc.iml" />
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6
StringCalc/.idea/vcs.xml
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6
StringCalc/.idea/vcs.xml
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<?xml version="1.0" encoding="UTF-8"?>
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<?xml version="1.0" encoding="UTF-8"?>
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<change afterPath="$PROJECT_DIR$/src/main/ASTNode.java" afterDir="false" />
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<change beforePath="$PROJECT_DIR$/.idea/description.html" beforeDir="false" />
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<change beforePath="$PROJECT_DIR$/UnnamedCalc.iml" beforeDir="false" />
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<change beforePath="$PROJECT_DIR$/out/production/UnnamedCalc/main/Main.class" beforeDir="false" />
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</list>
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<option name="SHOW_DIALOG" value="false" />
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<option name="SHOW_DIALOG" value="false" />
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<counts>
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<entry key="java" value="1415" />
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<usages-collector id="statistics.file.types.edit">
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<counts>
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<entry key="JAVA" value="1415" />
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||||||
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|
||||||
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|
|
||||||
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|
<option name="MAIN_CLASS_NAME" value="main.Main" />
|
||||||
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<module name="StringCalc" />
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|
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|
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|
||||||
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|
|
||||||
<configuration default="true" type="KotlinStandaloneScriptRunConfigurationType" factoryName="Kotlin script">
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|
||||||
<option name="filePath" />
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||||||
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|
||||||
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|
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<option name="passParentEnvs" value="true" />
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<option name="MAIN_CLASS_NAME" />
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||||||
<module name="" />
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|
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<option name="filePath" />
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<option name="alternativeJrePath" />
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|
||||||
<option name="VM_PARAMETERS" />
|
|
||||||
<option name="PROGRAM_PARAMETERS" />
|
|
||||||
<option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
|
|
||||||
<option name="ALTERNATIVE_JRE_PATH" />
|
|
||||||
<option name="PASS_PARENT_ENVS" value="true" />
|
|
||||||
<option name="MAIN_CLASS_NAME" />
|
|
||||||
<option name="WORKING_DIRECTORY" />
|
|
||||||
<method v="2">
|
|
||||||
<option name="Make" enabled="true" />
|
|
||||||
</method>
|
|
||||||
</configuration>
|
|
||||||
<configuration default="true" type="TestNG" factoryName="TestNG">
|
|
||||||
<option name="VM_PARAMETERS" />
|
|
||||||
<option name="WORKING_DIRECTORY" />
|
|
||||||
<properties />
|
|
||||||
<listeners />
|
|
||||||
<method v="2">
|
<method v="2">
|
||||||
<option name="Make" enabled="true" />
|
<option name="Make" enabled="true" />
|
||||||
</method>
|
</method>
|
||||||
@ -245,164 +55,15 @@
|
|||||||
</list>
|
</list>
|
||||||
</recent_temporary>
|
</recent_temporary>
|
||||||
</component>
|
</component>
|
||||||
<component name="SvnConfiguration">
|
<component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
|
||||||
<configuration />
|
|
||||||
</component>
|
|
||||||
<component name="TaskManager">
|
<component name="TaskManager">
|
||||||
<task active="true" id="Default" summary="Default task">
|
<task active="true" id="Default" summary="Default task">
|
||||||
<changelist id="1fea5f5f-b642-434d-a463-71cf57001c3e" name="Default" comment="" />
|
<changelist id="0d7153f8-0e49-471d-a8cf-5d96baa2b39c" name="Default Changelist" comment="" />
|
||||||
<created>1537276489642</created>
|
<created>1623164231258</created>
|
||||||
<option name="number" value="Default" />
|
<option name="number" value="Default" />
|
||||||
<option name="presentableId" value="Default" />
|
<option name="presentableId" value="Default" />
|
||||||
<updated>1537276489642</updated>
|
<updated>1623164231258</updated>
|
||||||
</task>
|
</task>
|
||||||
<servers />
|
<servers />
|
||||||
</component>
|
</component>
|
||||||
<component name="ToolWindowManager">
|
|
||||||
<frame x="0" y="28" width="1366" height="712" extended-state="0" />
|
|
||||||
<layout>
|
|
||||||
<window_info content_ui="combo" id="Project" order="0" sideWeight="0.488" weight="0.25" />
|
|
||||||
<window_info id="Structure" order="1" weight="0.25" />
|
|
||||||
<window_info id="Capture Tool" order="2" />
|
|
||||||
<window_info id="UI Designer" order="3" />
|
|
||||||
<window_info id="Palette	" order="4" />
|
|
||||||
<window_info id="Favorites" order="5" sideWeight="0.512" side_tool="true" weight="0.25" />
|
|
||||||
<window_info anchor="bottom" id="Message" order="0" />
|
|
||||||
<window_info anchor="bottom" id="Find" order="1" />
|
|
||||||
<window_info anchor="bottom" id="Run" order="2" weight="0.3281787" />
|
|
||||||
<window_info anchor="bottom" id="Debug" order="3" weight="0.39862543" />
|
|
||||||
<window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
|
|
||||||
<window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
|
|
||||||
<window_info anchor="bottom" id="TODO" order="6" />
|
|
||||||
<window_info anchor="bottom" id="Terminal" order="7" />
|
|
||||||
<window_info anchor="bottom" id="Event Log" order="8" side_tool="true" />
|
|
||||||
<window_info anchor="bottom" id="Version Control" order="9" show_stripe_button="false" />
|
|
||||||
<window_info anchor="bottom" id="Messages" order="10" weight="0.3281787" />
|
|
||||||
<window_info anchor="right" id="Commander" order="0" weight="0.4" />
|
|
||||||
<window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
|
|
||||||
<window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
|
|
||||||
<window_info anchor="right" id="Palette" order="3" />
|
|
||||||
<window_info anchor="right" id="Capture Analysis" order="4" />
|
|
||||||
<window_info anchor="right" id="Designer" order="5" />
|
|
||||||
<window_info anchor="right" id="Maven Projects" order="6" />
|
|
||||||
</layout>
|
|
||||||
</component>
|
|
||||||
<component name="Vcs.Log.UiProperties">
|
|
||||||
<option name="RECENTLY_FILTERED_USER_GROUPS">
|
|
||||||
<collection />
|
|
||||||
</option>
|
|
||||||
<option name="RECENTLY_FILTERED_BRANCH_GROUPS">
|
|
||||||
<collection />
|
|
||||||
</option>
|
|
||||||
</component>
|
|
||||||
<component name="VcsContentAnnotationSettings">
|
|
||||||
<option name="myLimit" value="2678400000" />
|
|
||||||
</component>
|
|
||||||
<component name="XDebuggerManager">
|
|
||||||
<breakpoint-manager>
|
|
||||||
<breakpoints>
|
|
||||||
<line-breakpoint enabled="true" type="java-line">
|
|
||||||
<url>file://$PROJECT_DIR$/src/main/Main.java</url>
|
|
||||||
<line>25</line>
|
|
||||||
<properties />
|
|
||||||
<option name="timeStamp" value="38" />
|
|
||||||
</line-breakpoint>
|
|
||||||
<line-breakpoint enabled="true" type="java-line">
|
|
||||||
<url>file://$PROJECT_DIR$/src/main/Main.java</url>
|
|
||||||
<line>33</line>
|
|
||||||
<properties />
|
|
||||||
<option name="timeStamp" value="39" />
|
|
||||||
</line-breakpoint>
|
|
||||||
<line-breakpoint enabled="true" type="java-line">
|
|
||||||
<url>file://$PROJECT_DIR$/src/main/Main.java</url>
|
|
||||||
<line>80</line>
|
|
||||||
<properties />
|
|
||||||
<option name="timeStamp" value="40" />
|
|
||||||
</line-breakpoint>
|
|
||||||
<line-breakpoint enabled="true" type="java-line">
|
|
||||||
<url>file://$PROJECT_DIR$/src/main/Main.java</url>
|
|
||||||
<line>53</line>
|
|
||||||
<properties />
|
|
||||||
<option name="timeStamp" value="42" />
|
|
||||||
</line-breakpoint>
|
|
||||||
<line-breakpoint enabled="true" type="java-line">
|
|
||||||
<url>file://$PROJECT_DIR$/src/main/Main.java</url>
|
|
||||||
<line>54</line>
|
|
||||||
<properties />
|
|
||||||
<option name="timeStamp" value="43" />
|
|
||||||
</line-breakpoint>
|
|
||||||
<line-breakpoint enabled="true" type="java-line">
|
|
||||||
<url>file://$PROJECT_DIR$/src/main/Main.java</url>
|
|
||||||
<line>55</line>
|
|
||||||
<properties />
|
|
||||||
<option name="timeStamp" value="44" />
|
|
||||||
</line-breakpoint>
|
|
||||||
<line-breakpoint enabled="true" type="java-line">
|
|
||||||
<url>file://$PROJECT_DIR$/src/main/Main.java</url>
|
|
||||||
<line>57</line>
|
|
||||||
<properties />
|
|
||||||
<option name="timeStamp" value="45" />
|
|
||||||
</line-breakpoint>
|
|
||||||
<line-breakpoint enabled="true" type="java-line">
|
|
||||||
<url>file://$PROJECT_DIR$/src/main/Main.java</url>
|
|
||||||
<line>58</line>
|
|
||||||
<properties />
|
|
||||||
<option name="timeStamp" value="46" />
|
|
||||||
</line-breakpoint>
|
|
||||||
<line-breakpoint enabled="true" type="java-line">
|
|
||||||
<url>file://$PROJECT_DIR$/src/main/Main.java</url>
|
|
||||||
<line>59</line>
|
|
||||||
<properties />
|
|
||||||
<option name="timeStamp" value="49" />
|
|
||||||
</line-breakpoint>
|
|
||||||
<line-breakpoint enabled="true" type="java-line">
|
|
||||||
<url>file://$PROJECT_DIR$/src/main/Main.java</url>
|
|
||||||
<line>63</line>
|
|
||||||
<properties />
|
|
||||||
<option name="timeStamp" value="51" />
|
|
||||||
</line-breakpoint>
|
|
||||||
<line-breakpoint enabled="true" type="java-line">
|
|
||||||
<url>file://$PROJECT_DIR$/src/main/Main.java</url>
|
|
||||||
<line>67</line>
|
|
||||||
<properties />
|
|
||||||
<option name="timeStamp" value="53" />
|
|
||||||
</line-breakpoint>
|
|
||||||
<line-breakpoint enabled="true" type="java-line">
|
|
||||||
<url>file://$PROJECT_DIR$/src/main/Main.java</url>
|
|
||||||
<line>71</line>
|
|
||||||
<properties />
|
|
||||||
<option name="timeStamp" value="56" />
|
|
||||||
</line-breakpoint>
|
|
||||||
<line-breakpoint enabled="true" type="java-line">
|
|
||||||
<url>file://$PROJECT_DIR$/src/main/Main.java</url>
|
|
||||||
<line>76</line>
|
|
||||||
<properties />
|
|
||||||
<option name="timeStamp" value="58" />
|
|
||||||
</line-breakpoint>
|
|
||||||
</breakpoints>
|
|
||||||
</breakpoint-manager>
|
|
||||||
</component>
|
|
||||||
<component name="antWorkspaceConfiguration">
|
|
||||||
<option name="IS_AUTOSCROLL_TO_SOURCE" value="false" />
|
|
||||||
<option name="FILTER_TARGETS" value="false" />
|
|
||||||
</component>
|
|
||||||
<component name="editorHistoryManager">
|
|
||||||
<entry file="jar:///usr/lib/jvm/java-8-oracle/src.zip!/java/lang/String.java">
|
|
||||||
<provider selected="true" editor-type-id="text-editor">
|
|
||||||
<state relative-caret-position="-1386">
|
|
||||||
<caret line="110" column="19" selection-start-line="110" selection-start-column="19" selection-end-line="110" selection-end-column="19" />
|
|
||||||
</state>
|
|
||||||
</provider>
|
|
||||||
</entry>
|
|
||||||
<entry file="file://$PROJECT_DIR$/src/main/Main.java">
|
|
||||||
<provider selected="true" editor-type-id="text-editor">
|
|
||||||
<state relative-caret-position="286">
|
|
||||||
<caret line="77" column="26" selection-start-line="77" selection-start-column="26" selection-end-line="77" selection-end-column="26" />
|
|
||||||
<folding>
|
|
||||||
<element signature="imports" expanded="true" />
|
|
||||||
</folding>
|
|
||||||
</state>
|
|
||||||
</provider>
|
|
||||||
</entry>
|
|
||||||
</component>
|
|
||||||
</project>
|
</project>
|
||||||
@ -8,5 +8,4 @@
|
|||||||
<orderEntry type="inheritedJdk" />
|
<orderEntry type="inheritedJdk" />
|
||||||
<orderEntry type="sourceFolder" forTests="false" />
|
<orderEntry type="sourceFolder" forTests="false" />
|
||||||
</component>
|
</component>
|
||||||
</module>
|
</module>
|
||||||
|
|
||||||
Binary file not shown.
25
StringCalc/src/main/ASTNode.java
Normal file
25
StringCalc/src/main/ASTNode.java
Normal file
@ -0,0 +1,25 @@
|
|||||||
|
package main;
|
||||||
|
|
||||||
|
class ASTNode {
|
||||||
|
ASTNode left;
|
||||||
|
ASTNode right;
|
||||||
|
Token token;
|
||||||
|
|
||||||
|
public ASTNode(Token token, ASTNode left, ASTNode right) {
|
||||||
|
this.left = left;
|
||||||
|
this.right = right;
|
||||||
|
this.token = token;
|
||||||
|
}
|
||||||
|
|
||||||
|
public ASTNode(Token token) {
|
||||||
|
this(token, null, null);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public String toString() {
|
||||||
|
if (right == null && left == null) {
|
||||||
|
return String.format("ASTNode{token=%s}", token);
|
||||||
|
}
|
||||||
|
return String.format("ASTNode{token=%s,left=%s,right=%s}", token, left, right);
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -1,88 +1,153 @@
|
|||||||
package main;
|
package main;
|
||||||
|
|
||||||
import java.util.Scanner;
|
import java.util.*;
|
||||||
import java.util.Stack;
|
import java.util.stream.Collectors;
|
||||||
import java.util.stream.IntStream;
|
|
||||||
|
|
||||||
public class Main {
|
public class Main {
|
||||||
|
|
||||||
public static void main(String[] args) {
|
public static void main(String[] args) {
|
||||||
|
|
||||||
Scanner scanner = new Scanner(System.in);
|
Scanner scanner = new Scanner(System.in);
|
||||||
String line;
|
String line;
|
||||||
Stack<String> operators = new Stack<>();
|
|
||||||
Stack<Float> numbers = new Stack<>();
|
|
||||||
|
|
||||||
line = scanner.nextLine();
|
line = scanner.nextLine();
|
||||||
|
line = line.replace(" ", "");
|
||||||
char[] lineArray = new char[line.length()];
|
line = line.replace("+-", "-");
|
||||||
|
line = line.replace("--", "+");
|
||||||
|
char[] lineArray;
|
||||||
lineArray = line.toCharArray();
|
lineArray = line.toCharArray();
|
||||||
|
List<Token> tokens = tokenize(lineArray);
|
||||||
System.out.println(calcExpression(lineArray, operators, numbers));
|
System.out.println("[\n"+tokens.stream()
|
||||||
|
.map(item -> "\t"+item)
|
||||||
|
.collect(Collectors.joining(",\n"))+"\n]");
|
||||||
|
ASTNode node = parse(tokens);
|
||||||
|
System.out.println(node.toString());
|
||||||
|
int result = evaluateAST(node);
|
||||||
|
System.out.println(result);
|
||||||
}
|
}
|
||||||
|
|
||||||
static float calcExpression(char[] charArr, Stack<String> operators, Stack<Float> numbers) {
|
static List<Token> tokenize(char[] charArr) {
|
||||||
for(int i = 0; i < charArr.length; i++) {
|
List<Token> tokens = new ArrayList<>();
|
||||||
|
StringBuilder tmpNumStr = new StringBuilder();
|
||||||
|
boolean isLastCharOperator = false;
|
||||||
|
for (int i = 0; i < charArr.length; i++) {
|
||||||
|
char c = charArr[i];
|
||||||
|
Token token = new Token(TokenType.Unknown, null);
|
||||||
|
if (Character.isDigit(c) || c == '-' && isLastCharOperator) {
|
||||||
|
isLastCharOperator = false;
|
||||||
|
tmpNumStr.append(c);
|
||||||
|
// if next char is also digit, then, instead of creating token, parse next digit
|
||||||
|
// if it's the end of array, then just create token and finish
|
||||||
|
if (i+1 != charArr.length) {
|
||||||
|
if(Character.isDigit(charArr[i+1])) {
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
token = new Token(TokenType.Number, Integer.parseInt(tmpNumStr.toString()));
|
||||||
|
tmpNumStr = new StringBuilder();
|
||||||
|
} else {
|
||||||
|
switch (c) {
|
||||||
|
case '(': {
|
||||||
|
token = new Token(TokenType.Operator, OperatorType.LeftParenthesis);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
case '+': {
|
||||||
|
token = new Token(TokenType.Operator, OperatorType.Add);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
case '-': {
|
||||||
|
token = new Token(TokenType.Operator, OperatorType.Sub);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
case '*': {
|
||||||
|
token = new Token(TokenType.Operator, OperatorType.Mul);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
case '/': {
|
||||||
|
token = new Token(TokenType.Operator, OperatorType.Div);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
case ')': {
|
||||||
|
token = new Token(TokenType.Operator, OperatorType.RightParenthesis);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
isLastCharOperator = true;
|
||||||
|
}
|
||||||
|
tokens.add(token);
|
||||||
|
}
|
||||||
|
|
||||||
String operatorTemp;
|
return tokens;
|
||||||
float numberTemp;
|
}
|
||||||
|
|
||||||
if (charArr == null)
|
static ASTNode parse(List<Token> tokens) {
|
||||||
throw new IllegalArgumentException("Num не должен быть null");
|
Stack<ASTNode> output = new Stack<>();
|
||||||
|
Stack<Token> ops = new Stack<>();
|
||||||
|
for (Token token : tokens) {
|
||||||
|
// https://en.wikipedia.org/wiki/Shunting-yard_algorithm
|
||||||
|
|
||||||
switch(charArr[i]) {
|
if (token.type == TokenType.Number) {
|
||||||
case '(': {
|
output.add(new ASTNode(token));
|
||||||
break;
|
continue;
|
||||||
}
|
}
|
||||||
case '+': {
|
|
||||||
operators.push("+");
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
case '-': {
|
|
||||||
operators.push("-");
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
case '*': {
|
|
||||||
operators.push("*");
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
case '/': {
|
|
||||||
operators.push("/");
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
case ')': {
|
|
||||||
operatorTemp = operators.pop();
|
|
||||||
numberTemp = numbers.pop();
|
|
||||||
|
|
||||||
switch(operatorTemp) {
|
if (token.type == TokenType.Operator) {
|
||||||
case "+": {
|
if (token.value == OperatorType.LeftParenthesis) {
|
||||||
numberTemp = numbers.pop() + numberTemp;
|
ops.push(token);
|
||||||
break;
|
continue;
|
||||||
}
|
}
|
||||||
case "-": {
|
|
||||||
numberTemp = numbers.pop() - numberTemp;
|
while (ops.size() != 0) {
|
||||||
break;
|
if (ops.peek().value == OperatorType.LeftParenthesis) {
|
||||||
}
|
break;
|
||||||
case "*": {
|
}
|
||||||
numberTemp = numbers.pop() * numberTemp;
|
|
||||||
break;
|
if (token.value != OperatorType.RightParenthesis) {
|
||||||
}
|
if (OperatorType.getPrecedence((OperatorType) ops.peek().value) < OperatorType.getPrecedence((OperatorType) token.value)) {
|
||||||
case "/": {
|
|
||||||
numberTemp = numbers.pop() / numberTemp;
|
|
||||||
break;
|
break;
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
numbers.push(numberTemp);
|
Token op = ops.pop();
|
||||||
break;
|
ASTNode right = output.pop();
|
||||||
|
ASTNode left = output.pop();
|
||||||
|
output.push(new ASTNode(op, left, right));
|
||||||
}
|
}
|
||||||
default: {
|
if (token.value == OperatorType.RightParenthesis) {
|
||||||
numbers.push(Float.parseFloat(String.valueOf(charArr[i])));
|
ops.pop();
|
||||||
|
} else {
|
||||||
|
ops.push(token);
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
return numbers.pop();
|
while(ops.size() != 0) {
|
||||||
|
Token op = ops.pop();
|
||||||
|
ASTNode right = output.pop();
|
||||||
|
ASTNode left = output.pop();
|
||||||
|
output.push(new ASTNode(op, left, right));
|
||||||
|
}
|
||||||
|
return output.pop();
|
||||||
|
}
|
||||||
|
|
||||||
|
static int evaluateAST(ASTNode node) {
|
||||||
|
int val = 0;
|
||||||
|
if (node.token.type == TokenType.Operator) {
|
||||||
|
switch ((OperatorType) node.token.value) {
|
||||||
|
case Add:
|
||||||
|
val = evaluateAST(node.left) + evaluateAST(node.right);
|
||||||
|
break;
|
||||||
|
case Sub:
|
||||||
|
val = evaluateAST(node.left) - evaluateAST(node.right);
|
||||||
|
break;
|
||||||
|
case Mul:
|
||||||
|
val = evaluateAST(node.left) * evaluateAST(node.right);
|
||||||
|
break;
|
||||||
|
case Div:
|
||||||
|
val = evaluateAST(node.left) / evaluateAST(node.right);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
val = (int) node.token.value;
|
||||||
|
}
|
||||||
|
return val;
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
23
StringCalc/src/main/OperatorType.java
Normal file
23
StringCalc/src/main/OperatorType.java
Normal file
@ -0,0 +1,23 @@
|
|||||||
|
package main;
|
||||||
|
|
||||||
|
public enum OperatorType {
|
||||||
|
Add,
|
||||||
|
Sub,
|
||||||
|
Mul,
|
||||||
|
Div,
|
||||||
|
LeftParenthesis,
|
||||||
|
RightParenthesis;
|
||||||
|
|
||||||
|
public static int getPrecedence(OperatorType type) {
|
||||||
|
switch (type) {
|
||||||
|
case Add:
|
||||||
|
case Sub:
|
||||||
|
return 0;
|
||||||
|
case Mul:
|
||||||
|
case Div:
|
||||||
|
return 1;
|
||||||
|
default:
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
22
StringCalc/src/main/Token.java
Normal file
22
StringCalc/src/main/Token.java
Normal file
@ -0,0 +1,22 @@
|
|||||||
|
package main;
|
||||||
|
|
||||||
|
enum TokenType {
|
||||||
|
Number,
|
||||||
|
Operator,
|
||||||
|
Unknown
|
||||||
|
}
|
||||||
|
|
||||||
|
class Token {
|
||||||
|
TokenType type;
|
||||||
|
Object value;
|
||||||
|
|
||||||
|
public Token(TokenType type, Object value) {
|
||||||
|
this.type = type;
|
||||||
|
this.value = value;
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public String toString() {
|
||||||
|
return "Token{type="+type+", value="+value+"}";
|
||||||
|
}
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue
Block a user