Nigel/CraftingInterpreters
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Moving from gradle to maven

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Gradle was causing to much of a headache and made the project just
frustrating to work in with all these nested folders and unnecessary
files
This commit is contained in:
Nigel Barink
2025-12-30 23:59:51 +01:00
parent f87ea7a09c
commit 8f9048c8dd
16 changed files with 411 additions and 721 deletions
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20
.gitignore vendored
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@@ -1,3 +1,4 @@
# Ignore Gradle files
.gradle
**/build/
!src/**/build/
@@ -26,3 +27,22 @@ bin
# Ignore Gradle build output directory
build
# Ignore Maven files
target/
pom.xml.tag
pom.xml.releaseBackup
pom.xml.versionsBackup
pom.xml.next
release.properties
dependency-reduced-pom.xml
buildNumber.properties
.mvn/timing.properties
# https://maven.apache.org/wrapper/#usage-without-binary-jar
.mvn/wrapper/maven-wrapper.jar
# Eclipse m2e generated files
# Eclipse Core
.project
# JDT-specific (Eclipse Java Development Tools)
.classpath

36
app/build.gradle
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@@ -1,36 +0,0 @@
/*
* This file was generated by the Gradle 'init' task.
*
* This generated file contains a sample Java application project to get you started.
* For more details on building Java & JVM projects, please refer to https://docs.gradle.org/8.10.2/userguide/building_java_projects.html in the Gradle documentation.
*/
plugins {
// Apply the application plugin to add support for building a CLI application in Java.
id 'application'
}
repositories {
// Use Maven Central for resolving dependencies.
mavenCentral()
}
dependencies {
// Use JUnit test framework.
testImplementation libs.junit
// This dependency is used by the application.
implementation libs.guava
}
// Apply a specific Java toolchain to ease working on different environments.
java {
toolchain {
languageVersion = JavaLanguageVersion.of(23)
}
}
application {
// Define the main class for the application.
mainClass = 'org.barink.Lox'
}

198
app/src/main/java/org/barink/Scanner.java
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@@ -1,198 +0,0 @@
package org.barink;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.barink.TokenType;
class Scanner {
private final String source;
private final List<Token> tokens = new ArrayList<>();
private int start = 0;
private int current = 0;
private int line = 1;
private static final Map<String, TokenType> keywords;
static {
keywords = new HashMap<>();
keywords.put("and", TokenType.AND);
keywords.put("class", TokenType.CLASS);
keywords.put("else", TokenType.ELSE);
keywords.put("false", TokenType.FALSE);
keywords.put("for", TokenType.FOR);
keywords.put("fun", TokenType.FUN);
keywords.put("if", TokenType.IF);
keywords.put("nil", TokenType.NIL);
keywords.put("or", TokenType.OR);
keywords.put("print", TokenType.PRINT);
keywords.put("return", TokenType.RETURN);
keywords.put("super", TokenType.SUPER);
keywords.put("this", TokenType.THIS);
keywords.put("true", TokenType.TRUE);
keywords.put("var", TokenType.TRUE);
keywords.put("while", TokenType.WHILE);
}
Scanner(String source){
this.source = source;
}
List<Token> scanTokens(){
while (!isAtEnd()){
// We are at the beginning of the next lexeme
start = current;
scanToken();
}
tokens.add(new Token(TokenType.EOF, "", null, line));
return tokens;
}
private void scanToken () {
char c = advance();
switch(c){
case '(': addToken(TokenType.LEFT_PAREN); break;
case ')': addToken(TokenType.RIGHT_PAREN); break;
case '{': addToken(TokenType.LEFT_BRACE); break;
case '}': addToken(TokenType.RIGHT_BRACE); break;
case ',': addToken(TokenType.COMMA); break;
case '.': addToken(TokenType.DOT); break;
case '-': addToken(TokenType.MINUS); break;
case '+': addToken(TokenType.PLUS); break;
case ';': addToken(TokenType.SEMICOLON); break;
case '*': addToken(TokenType.STAR); break;
case '!':
addToken(match('=')? TokenType.BANG_EQUAL : TokenType.BANG);
break;
case '=':
addToken(match('=')? TokenType.EQUAL_EQUAL : TokenType.EQUAL);
break;
case '<':
addToken(match('=')? TokenType.LESS_EQUAL : TokenType.LESS);
break;
case '>':
addToken(match('=')? TokenType.GREATER_EQUAL : TokenType.EQUAL);
break;
case '/':
if (match('/')){
// A comment goes until the end of the line.
while (peek() != '\n' && !isAtEnd()) advance();
} else {
addToken(TokenType.SLASH);
} break;
case ' ':
case '\r':
case '\t':
// Ignore whitespace.
break;
case '\n':
line++;
break;
case '"':
string();
break;
default:
if ( isDigit(c)){
number();
}else if (isAlpha(c)) {
identifier();
}
else {
Lox.error(line, "Unexpected character.");
}
break;
}
}
private void identifier(){
while(isAlphaNumeric(peek())) advance();
String text = source.substring(start, current);
TokenType type = keywords.get(text);
if (type == null) type = TokenType.IDENTIFIER;
addToken(type);
}
private boolean isAlpha(char c){
return ( c >= 'a' && c <= 'z') ||
(c >= 'A' && c <= 'Z') ||
c == '_';
}
private boolean isAlphaNumeric(char c){
return isAlpha(c) || isDigit(c);
}
private boolean isDigit(char c){
return c >= '0' && c <= '9';
}
private void number(){
while( isDigit(peek())) advance();
// Look for a fractional part.
if (peek() == '.' && isDigit(peekNext())){
// Consume the "."
advance();
while (isDigit(peek())) advance();
}
addToken(TokenType.NUMBER, Double.parseDouble(source.substring(start, current)));
}
private char peekNext(){
if (current + 1 >= source.length()) return '\0';
return source.charAt(current + 1);
}
private void string(){
while(peek() != '"' && !isAtEnd()){
if (peek() == '\n') line++;
advance();
}
if(isAtEnd()){
Lox.error(line, "Unterminated string.");
return;
}
// The closing ".
advance();
// Trim the surrounding quotes.
String value = source.substring(start + 1, current - 1);
addToken(TokenType.STRING, value);
}
private char peek(){
if (isAtEnd()) return '\0';
return source.charAt(current);
}
private boolean match(char expected){
if(isAtEnd()) return false;
if (source.charAt(current) != expected) return false;
current ++ ;
return true;
}
private char advance(){
return source.charAt(current++);
}
private void addToken(TokenType type)
{
addToken(type, null);
}
private void addToken(TokenType type, Object literal)
{
String text = source.substring(start, current);
tokens.add(new Token(type, text, literal, line ));
}
private boolean isAtEnd(){
return current >= source.length();
}
}

24
app/src/main/java/org/barink/TokenType.java
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@@ -1,24 +0,0 @@
package org.barink;
enum TokenType {
// Single-character tokens.
LEFT_PAREN, RIGHT_PAREN, LEFT_BRACE, RIGHT_BRACE,
COMMA, DOT, MINUS, PLUS, SEMICOLON, SLASH, STAR,
// One or two character tokens.
BANG, BANG_EQUAL,
EQUAL, EQUAL_EQUAL,
GREATER, GREATER_EQUAL,
LESS, LESS_EQUAL,
// Literals
IDENTIFIER, STRING, NUMBER,
// Keywords
AND, CLASS, ELSE, FALSE, FUN, FOR, IF, NIL, OR,
PRINT, RETURN, SUPER, THIS, TRUE, VAR, WHILE,
EOF
}

10
gradle/libs.versions.toml
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@@ -1,10 +0,0 @@
# This file was generated by the Gradle 'init' task.
# https://docs.gradle.org/current/userguide/platforms.html#sub::toml-dependencies-format
[versions]
guava = "33.2.1-jre"
junit = "4.13.2"
[libraries]
guava = { module = "com.google.guava:guava", version.ref = "guava" }
junit = { module = "junit:junit", version.ref = "junit" }

BIN
gradle/wrapper/gradle-wrapper.jar vendored
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Binary file not shown.

7
gradle/wrapper/gradle-wrapper.properties vendored
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@@ -1,7 +0,0 @@
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-8.10.2-bin.zip
networkTimeout=10000
validateDistributionUrl=true
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists

252
gradlew vendored
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@@ -1,252 +0,0 @@
#!/bin/sh
#
# Copyright © 2015-2021 the original authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# SPDX-License-Identifier: Apache-2.0
#
##############################################################################
#
# Gradle start up script for POSIX generated by Gradle.
#
# Important for running:
#
# (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
# noncompliant, but you have some other compliant shell such as ksh or
# bash, then to run this script, type that shell name before the whole
# command line, like:
#
# ksh Gradle
#
# Busybox and similar reduced shells will NOT work, because this script
# requires all of these POSIX shell features:
# * functions;
# * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
# «${var#prefix}», «${var%suffix}», and «$( cmd )»;
# * compound commands having a testable exit status, especially «case»;
# * various built-in commands including «command», «set», and «ulimit».
#
# Important for patching:
#
# (2) This script targets any POSIX shell, so it avoids extensions provided
# by Bash, Ksh, etc; in particular arrays are avoided.
#
# The "traditional" practice of packing multiple parameters into a
# space-separated string is a well documented source of bugs and security
# problems, so this is (mostly) avoided, by progressively accumulating
# options in "$@", and eventually passing that to Java.
#
# Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
# and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
# see the in-line comments for details.
#
# There are tweaks for specific operating systems such as AIX, CygWin,
# Darwin, MinGW, and NonStop.
#
# (3) This script is generated from the Groovy template
# https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
# within the Gradle project.
#
# You can find Gradle at https://github.com/gradle/gradle/.
#
##############################################################################
# Attempt to set APP_HOME
# Resolve links: $0 may be a link
app_path=$0
# Need this for daisy-chained symlinks.
while
APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path
[ -h "$app_path" ]
do
ls=$( ls -ld "$app_path" )
link=${ls#*' -> '}
case $link in #(
/*) app_path=$link ;; #(
*) app_path=$APP_HOME$link ;;
esac
done
# This is normally unused
# shellcheck disable=SC2034
APP_BASE_NAME=${0##*/}
# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s
' "$PWD" ) || exit
# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD=maximum
warn () {
echo "$*"
} >&2
die () {
echo
echo "$*"
echo
exit 1
} >&2
# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "$( uname )" in #(
CYGWIN* ) cygwin=true ;; #(
Darwin* ) darwin=true ;; #(
MSYS* | MINGW* ) msys=true ;; #(
NONSTOP* ) nonstop=true ;;
esac
CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
# IBM's JDK on AIX uses strange locations for the executables
JAVACMD=$JAVA_HOME/jre/sh/java
else
JAVACMD=$JAVA_HOME/bin/java
fi
if [ ! -x "$JAVACMD" ] ; then
die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
else
JAVACMD=java
if ! command -v java >/dev/null 2>&1
then
die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
fi
# Increase the maximum file descriptors if we can.
if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
case $MAX_FD in #(
max*)
# In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
# shellcheck disable=SC2039,SC3045
MAX_FD=$( ulimit -H -n ) ||
warn "Could not query maximum file descriptor limit"
esac
case $MAX_FD in #(
'' | soft) :;; #(
*)
# In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
# shellcheck disable=SC2039,SC3045
ulimit -n "$MAX_FD" ||
warn "Could not set maximum file descriptor limit to $MAX_FD"
esac
fi
# Collect all arguments for the java command, stacking in reverse order:
# * args from the command line
# * the main class name
# * -classpath
# * -D...appname settings
# * --module-path (only if needed)
# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
# For Cygwin or MSYS, switch paths to Windows format before running java
if "$cygwin" || "$msys" ; then
APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
JAVACMD=$( cygpath --unix "$JAVACMD" )
# Now convert the arguments - kludge to limit ourselves to /bin/sh
for arg do
if
case $arg in #(
-*) false ;; # don't mess with options #(
/?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath
[ -e "$t" ] ;; #(
*) false ;;
esac
then
arg=$( cygpath --path --ignore --mixed "$arg" )
fi
# Roll the args list around exactly as many times as the number of
# args, so each arg winds up back in the position where it started, but
# possibly modified.
#
# NB: a `for` loop captures its iteration list before it begins, so
# changing the positional parameters here affects neither the number of
# iterations, nor the values presented in `arg`.
shift # remove old arg
set -- "$@" "$arg" # push replacement arg
done
fi
# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
# Collect all arguments for the java command:
# * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
# and any embedded shellness will be escaped.
# * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
# treated as '${Hostname}' itself on the command line.
set -- \
"-Dorg.gradle.appname=$APP_BASE_NAME" \
-classpath "$CLASSPATH" \
org.gradle.wrapper.GradleWrapperMain \
"$@"
# Stop when "xargs" is not available.
if ! command -v xargs >/dev/null 2>&1
then
die "xargs is not available"
fi
# Use "xargs" to parse quoted args.
#
# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
#
# In Bash we could simply go:
#
# readarray ARGS < <( xargs -n1 <<<"$var" ) &&
# set -- "${ARGS[@]}" "$@"
#
# but POSIX shell has neither arrays nor command substitution, so instead we
# post-process each arg (as a line of input to sed) to backslash-escape any
# character that might be a shell metacharacter, then use eval to reverse
# that process (while maintaining the separation between arguments), and wrap
# the whole thing up as a single "set" statement.
#
# This will of course break if any of these variables contains a newline or
# an unmatched quote.
#
eval "set -- $(
printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
xargs -n1 |
sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
tr '\n' ' '
)" '"$@"'
exec "$JAVACMD" "$@"

94
gradlew.bat vendored
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@@ -1,94 +0,0 @@
@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem https://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem
@rem SPDX-License-Identifier: Apache-2.0
@rem
@if "%DEBUG%"=="" @echo off
@rem ##########################################################################
@rem
@rem Gradle startup script for Windows
@rem
@rem ##########################################################################
@rem Set local scope for the variables with windows NT shell
if "%OS%"=="Windows_NT" setlocal
set DIRNAME=%~dp0
if "%DIRNAME%"=="" set DIRNAME=.
@rem This is normally unused
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%
@rem Resolve any "." and ".." in APP_HOME to make it shorter.
for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome
set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if %ERRORLEVEL% equ 0 goto execute
echo. 1>&2
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
echo. 1>&2
echo Please set the JAVA_HOME variable in your environment to match the 1>&2
echo location of your Java installation. 1>&2
goto fail
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
if exist "%JAVA_EXE%" goto execute
echo. 1>&2
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
echo. 1>&2
echo Please set the JAVA_HOME variable in your environment to match the 1>&2
echo location of your Java installation. 1>&2
goto fail
:execute
@rem Setup the command line
set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
:end
@rem End local scope for the variables with windows NT shell
if %ERRORLEVEL% equ 0 goto mainEnd
:fail
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
rem the _cmd.exe /c_ return code!
set EXIT_CODE=%ERRORLEVEL%
if %EXIT_CODE% equ 0 set EXIT_CODE=1
if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
exit /b %EXIT_CODE%
:mainEnd
if "%OS%"=="Windows_NT" endlocal
:omega

35
pom.xml Normal file
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@@ -0,0 +1,35 @@
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion> <!-- POM Version to use -->
<groupId>dev.barink</groupId>
<artifactId>lox</artifactId>
<version>1.0</version>
<properties>
<maven.compiler.source>24</maven.compiler.source>
<maven.compiler.target>24</maven.compiler.target>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.3.0</version>
<configuration>
<archive>
<manifest>
<mainClass>app.Lox</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
</project>

14
settings.gradle
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@@ -1,14 +0,0 @@
/*
* This file was generated by the Gradle 'init' task.
*
* The settings file is used to specify which projects to include in your build.
* For more detailed information on multi-project builds, please refer to https://docs.gradle.org/8.10.2/userguide/multi_project_builds.html in the Gradle documentation.
*/
plugins {
// Apply the foojay-resolver plugin to allow automatic download of JDKs
id 'org.gradle.toolchains.foojay-resolver-convention' version '0.8.0'
}
rootProject.name = 'lox'
include('app')

16
src/main/java/app/Expr.java Normal file
View File

@@ -0,0 +1,16 @@
package app;
abstract class Expr {
static class Binary extends Expr {
Binary(Expr left, Token operator, Expr right) {
this.left = left;
this.operator = operator;
this.right = right;
}
final Expr left;
final Token operator;
final Expr right;
}
// Other expressions
}

22
app/src/main/java/org/barink/Lox.java → src/main/java/app/Lox.java
View File

@@ -1,7 +1,4 @@
/*
* This Java source file was generated by the Gradle 'init' task.
*/
package org.barink;
package app;
import java.io.BufferedReader;
import java.io.IOException;
@@ -11,7 +8,6 @@ import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.List;
public class Lox {
static boolean hadError = false;
@@ -22,14 +18,21 @@ public class Lox {
} else if (args.length == 1) {
runFile(args[0]);
} else {
try {
runPrompt();
} catch (IOException exception) {
System.out.println(exception.getMessage());
}
}
}
private static void runFile(String path) throws IOException {
byte[] bytes = Files.readAllBytes(Paths.get(path));
run(new String(bytes, Charset.defaultCharset()));
if (hadError) System.exit(65);
if (hadError) {
System.out.println("had Error!");
System.exit(65);
}
}
private static void runPrompt() throws IOException {
@@ -39,13 +42,16 @@ public class Lox {
for (;;) {
System.out.println("> ");
String line = reader.readLine();
if(line == null ) break;
if (line == null)
break;
run(line);
hadError = false;
}
}
private static void run(String source) {
System.out.println("Starting scan of source");
Scanner scanner = new Scanner(source);
List<Token> tokens = scanner.scanTokens();
@@ -62,6 +68,4 @@ public class Lox {
private static void report(int line, String where, String message) {
hadError = true;
}
}

228
src/main/java/app/Scanner.java Normal file
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@@ -0,0 +1,228 @@
package app;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
class Scanner {
private final String source;
private final List<Token> tokens = new ArrayList<>();
private int start = 0;
private int current = 0;
private int line = 1;
private static final Map<String, TokenType> keywords;
static {
keywords = new HashMap<>();
keywords.put("and", TokenType.AND);
keywords.put("class", TokenType.CLASS);
keywords.put("else", TokenType.ELSE);
keywords.put("false", TokenType.FALSE);
keywords.put("for", TokenType.FOR);
keywords.put("fun", TokenType.FUN);
keywords.put("if", TokenType.IF);
keywords.put("nil", TokenType.NIL);
keywords.put("or", TokenType.OR);
keywords.put("print", TokenType.PRINT);
keywords.put("return", TokenType.RETURN);
keywords.put("super", TokenType.SUPER);
keywords.put("this", TokenType.THIS);
keywords.put("true", TokenType.TRUE);
keywords.put("var", TokenType.TRUE);
keywords.put("while", TokenType.WHILE);
}
Scanner(String source) {
this.source = source;
}
List<Token> scanTokens() {
while (!isAtEnd()) {
// We are at the beginning of the next lexeme
start = current;
scanToken();
}
tokens.add(new Token(TokenType.EOF, "", null, line));
return tokens;
}
private void scanToken() {
char c = advance();
switch (c) {
case '(':
addToken(TokenType.LEFT_PAREN);
break;
case ')':
addToken(TokenType.RIGHT_PAREN);
break;
case '{':
addToken(TokenType.LEFT_BRACE);
break;
case '}':
addToken(TokenType.RIGHT_BRACE);
break;
case ',':
addToken(TokenType.COMMA);
break;
case '.':
addToken(TokenType.DOT);
break;
case '-':
addToken(TokenType.MINUS);
break;
case '+':
addToken(TokenType.PLUS);
break;
case ';':
addToken(TokenType.SEMICOLON);
break;
case '*':
addToken(TokenType.STAR);
break;
case '!':
addToken(match('=') ? TokenType.BANG_EQUAL : TokenType.BANG);
break;
case '=':
addToken(match('=') ? TokenType.EQUAL_EQUAL : TokenType.EQUAL);
break;
case '<':
addToken(match('=') ? TokenType.LESS_EQUAL : TokenType.LESS);
break;
case '>':
addToken(match('=') ? TokenType.GREATER_EQUAL : TokenType.EQUAL);
break;
case '/':
if (match('/')) {
// A comment goes until the end of the line.
while (peek() != '\n' && !isAtEnd())
advance();
} else {
addToken(TokenType.SLASH);
}
break;
case ' ':
case '\r':
case '\t':
// Ignore whitespace.
break;
case '\n':
line++;
break;
case '"':
string();
break;
default:
if (isDigit(c)) {
number();
} else if (isAlpha(c)) {
identifier();
} else {
Lox.error(line, "Unexpected character.");
}
break;
}
}
private void identifier() {
while (isAlphaNumeric(peek()))
advance();
String text = source.substring(start, current);
TokenType type = keywords.get(text);
if (type == null)
type = TokenType.IDENTIFIER;
addToken(type);
}
private boolean isAlpha(char c) {
return (c >= 'a' && c <= 'z') ||
(c >= 'A' && c <= 'Z') ||
c == '_';
}
private boolean isAlphaNumeric(char c) {
return isAlpha(c) || isDigit(c);
}
private boolean isDigit(char c) {
return c >= '0' && c <= '9';
}
private void number() {
while (isDigit(peek()))
advance();
// Look for a fractional part.
if (peek() == '.' && isDigit(peekNext())) {
// Consume the "."
advance();
while (isDigit(peek()))
advance();
}
addToken(TokenType.NUMBER, Double.parseDouble(source.substring(start, current)));
}
private char peekNext() {
if (current + 1 >= source.length())
return '\0';
return source.charAt(current + 1);
}
private void string() {
while (peek() != '"' && !isAtEnd()) {
if (peek() == '\n')
line++;
advance();
}
if (isAtEnd()) {
Lox.error(line, "Unterminated string.");
return;
}
// The closing ".
advance();
// Trim the surrounding quotes.
String value = source.substring(start + 1, current - 1);
addToken(TokenType.STRING, value);
}
private char peek() {
if (isAtEnd())
return '\0';
return source.charAt(current);
}
private boolean match(char expected) {
if (isAtEnd())
return false;
if (source.charAt(current) != expected)
return false;
current++;
return true;
}
private char advance() {
return source.charAt(current++);
}
private void addToken(TokenType type) {
addToken(type, null);
}
private void addToken(TokenType type, Object literal) {
String text = source.substring(start, current);
tokens.add(new Token(type, text, literal, line));
}
private boolean isAtEnd() {
return current >= source.length();
}
}

2
app/src/main/java/org/barink/Token.java → src/main/java/app/Token.java
View File

@@ -1,4 +1,4 @@
package org.barink;
package app;
class Token {
final TokenType type;

22
src/main/java/app/TokenType.java Normal file
View File

@@ -0,0 +1,22 @@
package app;
enum TokenType {
// Single-character tokens.
LEFT_PAREN, RIGHT_PAREN, LEFT_BRACE, RIGHT_BRACE,
COMMA, DOT, MINUS, PLUS, SEMICOLON, SLASH, STAR,
// One or two character tokens.
BANG, BANG_EQUAL,
EQUAL, EQUAL_EQUAL,
GREATER, GREATER_EQUAL,
LESS, LESS_EQUAL,
// Literals
IDENTIFIER, STRING, NUMBER,
// Keywords
AND, CLASS, ELSE, FALSE, FUN, FOR, IF, NIL, OR,
PRINT, RETURN, SUPER, THIS, TRUE, VAR, WHILE,
EOF
}