mirror of
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java: examples: split in two
* examples/java: Split in... * examples/java/simple, examples/java/calc: these.
This commit is contained in:
Akim Demaille
9
NEWS
9
NEWS
@@ -75,6 +75,15 @@ GNU Bison NEWS
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the translated symbol (i.e., it returns '_("variable")' rather that
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'"variable"').
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** Documentation
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There are now two examples in examples/java: a very simple calculator, and
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one that tracks locations to provide acurate error messages.
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A new C example, bistromathic, is a fully featured calculator using many
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Bison features: pure interface, location tracking, internationalized
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custom error messages, lookahead-correction, rich debug traces, etc.
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* Noteworthy changes in release 3.5.1 (2020-01-19) [stable]
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** Bug fixes
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@@ -5,8 +5,11 @@ This directory contains examples of Bison grammar files in Java.
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You can run `make` to compile these examples. And `make clean` to tidy
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afterwards.
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## java/Calc.y
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The usual calculator.
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## simple/Calc.y
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The usual calculator, a very simple version.
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## calc/Calc.y
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The calculator, but with location tracking and debug traces.
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<!---
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@@ -160,7 +160,7 @@ class Position {
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line = p.line;
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column = p.column;
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}
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public boolean equals (Position l)
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{
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return l.line == line && l.column == column;
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@@ -168,7 +168,7 @@ class Position {
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public String toString ()
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{
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return Integer.toString (line) + "." + Integer.toString(column);
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return Integer.toString (line) + "." + Integer.toString (column);
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}
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public int line ()
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@@ -187,7 +187,7 @@ class PositionReader extends BufferedReader {
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private Position position = new Position ();
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public PositionReader (Reader reader) {
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super(reader);
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super (reader);
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}
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public int read () throws IOException {
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36
examples/java/calc/local.mk
Normal file
36
examples/java/calc/local.mk
Normal file
@@ -0,0 +1,36 @@
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## Copyright (C) 2018-2020 Free Software Foundation, Inc.
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##
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## This program is free software: you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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## the Free Software Foundation, either version 3 of the License, or
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## (at your option) any later version.
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##
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## This program is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with this program. If not, see <http://www.gnu.org/licenses/>.
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java_calcdir = $(docdir)/%D%
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## ------ ##
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## Calc. ##
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## ------ ##
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if ENABLE_JAVA
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check_SCRIPTS += %D%/Calc.class
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TESTS += %D%/Calc.test
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endif
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EXTRA_DIST += %D%/Calc.test
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%D%/Calc.java: %D%/Calc.y $(dependencies)
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$(AM_V_GEN)$(MKDIR_P) %D%
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$(AM_V_at)$(BISON) $(srcdir)/%D%/Calc.y -o $@
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%D%/Calc.class: %D%/Calc.java
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$(AM_V_GEN) $(SHELL) $(top_builddir)/javacomp.sh %D%/Calc.java
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dist_java_calc_DATA = %D%/Calc.y %D%/Makefile
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CLEANFILES += %D%/*.class %D%/Calc.java
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@@ -1,4 +1,4 @@
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## Copyright (C) 2018-2020 Free Software Foundation, Inc.
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## Copyright (C) 2020 Free Software Foundation, Inc.
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##
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## This program is free software: you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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@@ -14,23 +14,7 @@
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## along with this program. If not, see <http://www.gnu.org/licenses/>.
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javadir = $(docdir)/%D%
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dist_java_DATA = %D%/README.md
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## ------ ##
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## Calc. ##
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## ------ ##
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if ENABLE_JAVA
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check_SCRIPTS += %D%/Calc.class
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TESTS += %D%/Calc.test
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endif
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EXTRA_DIST += %D%/Calc.test
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%D%/Calc.java: %D%/Calc.y $(dependencies)
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$(AM_V_GEN)$(MKDIR_P) %D%
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$(AM_V_at)$(BISON) $(srcdir)/%D%/Calc.y -o $@
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%D%/Calc.class: %D%/Calc.java
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$(AM_V_GEN) $(SHELL) $(top_builddir)/javacomp.sh %D%/Calc.java
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dist_java_DATA = %D%/Calc.y %D%/Makefile %D%/README.md
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CLEANFILES += %D%/*.class %D%/Calc.java
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include %D%/calc/local.mk
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include %D%/simple/local.mk
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33
examples/java/simple/Calc.test
Normal file
33
examples/java/simple/Calc.test
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@@ -0,0 +1,33 @@
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#! /bin/sh
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# Copyright (C) 2018-2020 Free Software Foundation, Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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cat >input <<EOF
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1 + 2 * 3
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EOF
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run 0 7
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cat >input <<EOF
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1 + 2 * 3 = 7
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(1 + 2) * 3 = 9
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EOF
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run 0 '7
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9'
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cat >input <<EOF
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1 + 2 * * 3
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EOF
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run 0 "err: syntax error, unexpected '*', expecting number or '-' or '(' or '!'"
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109
examples/java/simple/Calc.y
Normal file
109
examples/java/simple/Calc.y
Normal file
@@ -0,0 +1,109 @@
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%language "Java"
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%define api.parser.class {Calc}
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%define api.parser.public
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%define parse.error verbose
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%code imports {
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.Reader;
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import java.io.StreamTokenizer;
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}
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%code {
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public static void main (String args[]) throws IOException
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{
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CalcLexer l = new CalcLexer (System.in);
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Calc p = new Calc (l);
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if (!p.parse ())
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System.exit (1);
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}
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}
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/* Bison Declarations */
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%token <Integer> NUM "number"
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%type <Integer> exp
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%nonassoc '=' /* comparison */
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%left '-' '+'
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%left '*' '/'
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%precedence NEG /* negation--unary minus */
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%right '^' /* exponentiation */
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/* Grammar follows */
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%%
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input:
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line
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| input line
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;
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line:
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'\n'
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| exp '\n' { System.out.println ($exp); }
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| error '\n'
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;
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exp:
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NUM { $$ = $1; }
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| exp '=' exp
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{
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if ($1.intValue () != $3.intValue ())
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yyerror ("calc: error: " + $1 + " != " + $3);
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}
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| exp '+' exp { $$ = $1 + $3; }
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| exp '-' exp { $$ = $1 - $3; }
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| exp '*' exp { $$ = $1 * $3; }
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| exp '/' exp { $$ = $1 / $3; }
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| '-' exp %prec NEG { $$ = -$2; }
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| exp '^' exp { $$ = (int) Math.pow ($1, $3); }
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| '(' exp ')' { $$ = $2; }
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| '(' error ')' { $$ = 1111; }
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| '!' { $$ = 0; return YYERROR; }
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| '-' error { $$ = 0; return YYERROR; }
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;
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%%
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class CalcLexer implements Calc.Lexer {
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StreamTokenizer st;
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public CalcLexer (InputStream is)
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{
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st = new StreamTokenizer (new InputStreamReader (is));
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st.resetSyntax ();
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st.eolIsSignificant (true);
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st.wordChars ('0', '9');
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}
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public void yyerror (String s)
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{
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System.err.println (s);
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}
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Integer yylval;
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public Object getLVal () {
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return yylval;
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}
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public int yylex () throws IOException {
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int ttype = st.nextToken ();
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if (ttype == st.TT_EOF)
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return EOF;
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else if (ttype == st.TT_EOL)
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return (int) '\n';
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else if (ttype == st.TT_WORD)
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{
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yylval = new Integer (st.sval);
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return NUM;
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}
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else if (st.ttype == ' ' || st.ttype == '\t')
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return yylex ();
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else
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return st.ttype;
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}
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}
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26
examples/java/simple/Makefile
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26
examples/java/simple/Makefile
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@@ -0,0 +1,26 @@
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# This Makefile is designed to be simple and readable. It does not
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# aim at portability. It requires GNU Make.
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BISON = bison
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JAVAC = javac
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JAVA = java
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XSLTPROC = xsltproc
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all: Calc.class
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%.java %.xml %.gv: %.y
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$(BISON) $(BISONFLAGS) --xml --graph=$*.gv -o $*.java $<
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%.class: %.java
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$(JAVAC) $(JAVACFLAGS) $<
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run: Calc.class
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@echo "Type arithmetic expressions. Quit with ctrl-d."
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$(JAVA) $(JAVAFLAGS) Calc
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html: Calc.html
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%.html: %.xml
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$(XSLTPROC) $(XSLTPROCFLAGS) -o $@ $$($(BISON) --print-datadir)/xslt/xml2xhtml.xsl $<
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clean:
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rm -f *.class Calc.java Calc.html Calc.xml Calc.gv
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36
examples/java/simple/local.mk
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36
examples/java/simple/local.mk
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@@ -0,0 +1,36 @@
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## Copyright (C) 2018-2020 Free Software Foundation, Inc.
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##
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## This program is free software: you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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## the Free Software Foundation, either version 3 of the License, or
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## (at your option) any later version.
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##
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## This program is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with this program. If not, see <http://www.gnu.org/licenses/>.
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java_simpledir = $(docdir)/%D%
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## ------ ##
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## Calc. ##
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## ------ ##
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if ENABLE_JAVA
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check_SCRIPTS += %D%/Calc.class
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TESTS += %D%/Calc.test
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endif
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EXTRA_DIST += %D%/Calc.test
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%D%/Calc.java: %D%/Calc.y $(dependencies)
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$(AM_V_GEN)$(MKDIR_P) %D%
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$(AM_V_at)$(BISON) $(srcdir)/%D%/Calc.y -o $@
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%D%/Calc.class: %D%/Calc.java
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$(AM_V_GEN) $(SHELL) $(top_builddir)/javacomp.sh %D%/Calc.java
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dist_java_simple_DATA = %D%/Calc.y %D%/Makefile
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CLEANFILES += %D%/*.class %D%/Calc.java
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