Merge pull request #2 from sandybrownlee/main

Bugfixes following Java 17 updates

Triangle.Compiler/src/main/java/triangle/Compiler.java

@@ -51,7 +51,7 @@ public class Compiler {
 	 * @param sourceName   the name of the file containing the source program.
 	 * @param objectName   the name of the file containing the object program.
 	 * @param showingAST   true iff the AST is to be displayed after contextual
-	 *                     analysis (not currently implemented).
+	 *                     analysis
 	 * @param showingTable true iff the object description details are to be
 	 *                     displayed during code generation (not currently
 	 *                     implemented).
@@ -74,8 +74,8 @@ public class Compiler {
 		reporter = new ErrorReporter();
 		parser = new Parser(scanner, reporter);
 		checker = new Checker(reporter);
-		encoder = new Encoder(emitter, reporter);
 		emitter = new Emitter(reporter);
+		encoder = new Encoder(emitter, reporter);
 		drawer = new Drawer();
 
 		// scanner.enableDebugging();
@@ -113,14 +113,17 @@ public class Compiler {
 	 */
 	public static void main(String[] args) {
 
-		if (args.length != 1) {
-			System.out.println("Usage: tc filename");
+		if (args.length < 1) {
+			System.out.println("Usage: tc filename [tree]");
 			System.exit(1);
 		}
 
 		String sourceName = args[0];
-		var compiledOK = compileProgram(sourceName, objectName, false, false);
+		boolean tree = (args.length > 1 && args[1].equalsIgnoreCase("tree"));
+		var compiledOK = compileProgram(sourceName, objectName, tree, false);
 
-		System.exit(compiledOK ? 0 : 1);
+		if (!tree) {
+			System.exit(compiledOK ? 0 : 1);
+		}
 	}
 }

Triangle.Compiler/src/main/java/triangle/codeGenerator/Encoder.java

@@ -545,7 +545,7 @@ public final class Encoder implements ActualParameterVisitor<Frame, Integer>,
 	public Integer visitRecordTypeDenoter(RecordTypeDenoter ast, Frame frame) {
 		int typeSize;
 		if (ast.entity == null) {
-			typeSize = ast.FT.visit(this, null);
+			typeSize = ast.FT.visit(this, frame);
 			ast.entity = new TypeRepresentation(typeSize);
 			writeTableDetails(ast);
 		} else {
@@ -556,6 +556,10 @@ public final class Encoder implements ActualParameterVisitor<Frame, Integer>,
 
 	@Override
 	public Integer visitMultipleFieldTypeDenoter(MultipleFieldTypeDenoter ast, Frame frame) {
+		if (frame == null) { // in this case, we're just using the frame to wrap up the size
+			frame = Frame.Initial;
+		}
+		
 		var offset = frame.getSize();
 		int fieldSize;
 		if (ast.entity == null) {

Triangle.Compiler/src/main/java/triangle/contextualAnalyzer/Checker.java

@@ -204,7 +204,7 @@ public final class Checker implements ActualParameterVisitor<FormalParameter, Vo
 		var binding = ast.O.visit(this);
 
 		if (binding instanceof BinaryOperatorDeclaration bbinding) {
-			if (bbinding.ARG1.equals(StdEnvironment.anyType)) {
+			if (bbinding.ARG1 == StdEnvironment.anyType) {
 				// this operator must be "=" or "\="
 				checkAndReportError(e1Type.equals(e2Type), "incompatible argument types for \"%\"", ast.O, ast);
 			} else {
@@ -678,9 +678,10 @@ public final class Checker implements ActualParameterVisitor<FormalParameter, Vo
 	public TypeDenoter visitDotVname(DotVname ast, Void arg) {
 		ast.type = null;
 		var vType = ast.V.visit(this);
+		ast.variable = ast.V.variable;
 		if (vType instanceof RecordTypeDenoter record) {
 			ast.type = checkFieldIdentifier(record.FT, ast.I);
-			checkAndReportError(!ast.type.equals(StdEnvironment.errorType), "no field \"%\" in this record type",
+			checkAndReportError(ast.type != StdEnvironment.errorType, "no field \"%\" in this record type",
 					ast.I);
 		} else {
 			reportError("record expected here", ast.V);
@@ -695,8 +696,10 @@ public final class Checker implements ActualParameterVisitor<FormalParameter, Vo
 
 		var binding = ast.I.visit(this);
 		if (binding instanceof ConstantDeclaration constant) {
+			ast.variable = false;
 			return ast.type = constant.getType();
 		} else if (binding instanceof VariableDeclaration variable) {
+			ast.variable = true;
 			return ast.type = variable.getType();
 		}
 

Triangle.Compiler/src/main/java/triangle/contextualAnalyzer/IdentificationTable.java

@@ -53,7 +53,7 @@ public final class IdentificationTable {
 	// same identifier at the current level.
 
 	public void enter(String id, Declaration attr) {
-		attr.duplicated = retrieve(id) != null;
+		attr.duplicated = retrieve(id, true) != null;
 		this.latest = new IdEntry(id, attr, this.level, this.latest);
 	}
 
@@ -64,9 +64,15 @@ public final class IdentificationTable {
 	// otherwise returns the attribute field of the entry found.
 
 	public Declaration retrieve(String id) {
+		return retrieve(id, false);
+	}
+
+	// thisLevelOnly limits the search to only the current level
+	
+	public Declaration retrieve(String id, boolean thisLevelOnly) {
 		var entry = this.latest;
 		while (true) {
-			if (entry == null) {
+			if (entry == null || (thisLevelOnly && entry.level < this.level)) {
 				break;
 			} else if (entry.id.equals(id)) {
 				return entry.attr;

Triangle.Compiler/src/main/java/triangle/syntacticAnalyzer/Scanner.java

@@ -63,6 +63,8 @@ public final class Scanner {
 
 	private void scanSeparator() {
 		switch (currentChar) {
+		
+		// comment
 		case '!': {
 			takeIt();
 			while ((currentChar != SourceFile.EOL) && (currentChar != SourceFile.EOT))
@@ -72,6 +74,7 @@ public final class Scanner {
 		}
 			break;
 
+		// whitespace
 		case ' ':
 		case '\n':
 		case '\r':
@@ -247,6 +250,7 @@ public final class Scanner {
 		int kind;
 
 		currentlyScanningToken = false;
+		// skip any whitespace or comments
 		while (currentChar == '!' || currentChar == ' ' || currentChar == '\n' || currentChar == '\r'
 				|| currentChar == '\t')
 			scanSeparator();

Triangle.Compiler/src/main/java/triangle/treeDrawer/DrawerFrame.java

@@ -16,13 +16,20 @@ package triangle.treeDrawer;
 
 import java.awt.Container;
 import java.awt.Dimension;
+import java.awt.Rectangle;
 import java.awt.Toolkit;
+import java.awt.event.AdjustmentEvent;
+import java.awt.event.AdjustmentListener;
+import java.awt.event.ComponentAdapter;
+import java.awt.event.ComponentEvent;
 import java.awt.event.WindowAdapter;
 import java.awt.event.WindowEvent;
 
 import javax.swing.JFrame;
 import javax.swing.JPanel;
+import javax.swing.JScrollBar;
 import javax.swing.JScrollPane;
+import javax.swing.SwingUtilities;
 
 class DrawerFrame extends JFrame {
 	/**
@@ -49,6 +56,19 @@ class DrawerFrame extends JFrame {
 			}
 		});
 		Container contentPane = getContentPane();
-		contentPane.add(new JScrollPane(panel));
+		final JScrollPane jScrollPane = new JScrollPane(panel);
+		
+		contentPane.addComponentListener(new ComponentAdapter() {
+			@Override
+			public void componentResized(ComponentEvent e) {
+				super.componentResized(e);
+				jScrollPane.getHorizontalScrollBar().setValue(jScrollPane.getHorizontalScrollBar().getMaximum());
+				jScrollPane.getHorizontalScrollBar().setValue(jScrollPane.getHorizontalScrollBar().getValue() / 2);
+			}
+		});
+
+		contentPane.add(jScrollPane);
+		
 	}
+
 }

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,234 @@
+#!/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.
+#
+
+##############################################################################
+#
+#   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/master/subprojects/plugins/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
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&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: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$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
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# 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 "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,89 @@
+@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
+
+@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=.
+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%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+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%"=="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!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

programs/assignments.tri

@@ -0,0 +1,9 @@
+let
+    var n : Integer;
+    var c : Char
+in
+
+	begin
+		c := '&';
+		n := n + 1
+	end

programs/ifdemo.tri

@@ -0,0 +1,9 @@
+let
+    var a : Integer;
+    var n : Integer
+in
+    begin
+        if a < 0 
+        then  n := 0
+        else  n := 1
+    end

programs/simpleadding.tri

@@ -0,0 +1,10 @@
+let
+    var a : Integer;
+    var b : Integer;
+    var c : Integer
+
+in
+    begin
+        a := 1; b := 2; c := a / b;
+    end
+