Commit 49be8565 authored by Administrator's avatar Administrator
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initial fork

Changes from 1.7 to -with-syntaxtree branch:
New feature, 'syntaxtree generation' makes it possible to automatically
generate a semantics class that creates a syntaxtree, compatible to the
java-cup 0.11b parser generator. Its format is a generic DOM format, that
can be queried and processed with XML/XSL as well as custom tree
transformers in Java.
Changes from distribution 1.6.1 to 1.7:
New feature, 'deferred actions' makes it possible to construct messages
that can be revoked in case of backtracking.
The feature uses lambda expressions of Java, which means it requires
Java version 1.8 (JSE 8).
The manual is revised, with added references to new literature about
converting EBNF to PEG.
Some code clean-up and restructuring has been done, with class Phrase
separated form ParserBase.
Changes from distribution 1.6 to 1.6.1:
Classes for Mouse tools: Generate, TestParser, TestPEG, TryParser,
and MakeRuntime are made public.
Option --mode=755 is added to the 'tar' command used to create
Mouse-1.6.1.tar. This should set the correct permission bits
when the archive is unpacked under Unix. (The original files
and directories are under Windows, and have different permissions,
not copied by 'tar'.)
Changes from distribution 1.5.1 to 1.6:
'TestParser' can optionally write its output in the form of
comma-separated values (CSV) that can be imported into a spreadsheet
application. This is controlled by option '-C'.
'TryParser' and 'TestParser' may optionally write timing information.
This is controlled by option '-t'.
The output format of both 'TryParser' and 'TestParser' is slightly
changed: file name precedes output from the parser under test.
Three bugs fixed:
- A semicolon generated after 'while' caused infinite
loop in an internal parsing procedure with a body
consisting of a '*+' expression only.
- Omitted '-S' option to Generate ignored the package specified
by '-r' when defining SemanticBase.
- 'rhsText' did not return empty string for empty range.
Changes from distribution 1.5 to 1.5.1:
Bug fix and clean-up due to Stephen P. Owens (
Fixed bug: after parser failure, printed a blank line if the error message
was intercepted by semantics and error info cleared using errClear().
Clean-up: removed unused variables and imports from six source files.
Changes from distribution 1.4 to 1.5:
Identity of rule that created a Phrase made available
to semantic procedures via helper methods 'rule' and 'isTerm'.
Bug fixed in the generated parser:
incorrect handling of ^[s] when s has length 1.
Build file provided for compiling the source and making the jars:
'build.xml' for Apache Ant. Invocation is described in a comment.
Changes from distribution 1.3.1 to 1.4:
Shorthand forms introduced for three frequently used
constructions. They are easier to read and have
a more efficient implementation.
- e1*+ e2. A shorthand for (!e2 e1)*e2:
iterate e1 until e2.
- e1++ e2. A shorthand for (!e2 e1)+e2:
iterate e1 at least once until e2.
- ^[s]. A shorthand for ![s]_:
consume character NOT appearing in string s.
Position of a Phrase in source text made available
to semantic procedures via helper method 'where'.
(Feature request 3298666.)
A slightly better formulation for messages
about failing predicate !e.
Changes from distribution 1.3a to 1.3.1:
Two bugs fixed in the generated parser:
- the error message for failing predicate &e was
'expected not e' instead of 'expected e'.
- an attempt to print error position at the end of file
resulted in an infinite loop.
One bug fixed in Generate:
- printed extra message 'expected : or end of input'
for syntax error after last semicolon.
Two errors corrected in the sample grammar for Java 1.6.
Sample grammar for Java 1.7 added.
Change from distribution 1.3 to 1.3a:
Revised version of user's manual.
Changes from distribution 1.2 to 1.3:
In the generated parser, do not check for success
of expressions that never fail.
Default character encoding is assumed for the input file
(version 1.2 assumed ISO 8859_1).
Can be changed by modifying 'runtime.SourceFile'.
The generated Java code uses ASCII encoding.
Helper method 'errMsg' returns a 'readable' string:
all characters outside the range 32-255 are represented
by Java escapes.
Improved diagnostics from TestPEG.
Minor bug fixes.
Sample grammars for Java and C are included in the package.
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<?xml version="1.0" encoding="ISO-8859-1"?>
* Stand in the distribution directory Mouse-1.7 and invoke Apache Ant:
* ant -Ddest=<destdir> <targets>
* where <destdir> is name of the directory to contain the result.
* This directory will be deleted if it exists and then re-created.
* If you omit -D option, destdir is the subdirectory 'build' of Mouse-1.7.
* <targets> are one or more of:
* full-jar - build complete Mouse-1.7.jar
* runtime-jar - build Mouse-1.7.runtime.jar
* compile - compile all source to subdirectory 'mouse'
* of destdir. It is included in the preceding two.
* Default is all of above.
* 2011-11-08 Created.
* 2012-01-06 Updated for version 1.5.1.
* 2013-04-15 Updated for version 1.6.
* 2014-04-13 Updated for version 1.6.1.
* 2015-07-25 Updated for version 1.7.
* =========================================================================
<project name="MakeMouse" basedir="." default="all" >
<property name="dest" value="${basedir}/build" />
<target name="all" depends="full-jar, runtime-jar" />
<target name="full-jar" depends="compile, rtsource">
<jar basedir="${dest}" destfile="${dest}/Mouse-1.7.jar" />
<delete dir="${dest}/rtsource" />
<target name="runtime-jar" depends="compile">
<jar basedir="${dest}/mouse/runtime"
destfile="${dest}/Mouse-1.7.runtime.jar" />
<target name="compile" depends="init">
<javac srcdir="${basedir}/src" destdir="${dest}" includeAntRuntime="no" />
<target name="rtsource" depends="rtdir" >
<copy todir="${dest}/rtsource">
<fileset dir="${basedir}/src/mouse/runtime" />
<target name="rtdir" depends="init">
<mkdir dir="${dest}/rtsource"/>
<target name="init" depends="clean">
<mkdir dir="${dest}"/>
<target name="clean">
<delete dir="${dest}"/>
\section{Appendix: The grammar of \Mouse\ PEG}
Grammar = Space (Rule/Skip)*+ EOT ;
Rule = Name EQUAL RuleRhs DiagName? SEMI ;
Skip = SEMI
/ _++ (SEMI/EOT) ;
RuleRhs = Sequence Actions (SLASH Sequence Actions)* ;
Choice = Sequence (SLASH Sequence)* ;
Sequence = Prefixed+ ;
Prefixed = PREFIX? Suffixed ;
Suffixed = Primary (UNTIL Primary / SUFFIX)? ;
Primary = Name
/ StringLit
/ Range
/ CharClass ;
Actions = OnSucc OnFail ;
OnSucc = (LWING AND? Name? RWING)? ;
OnFail = (TILDA LWING Name? RWING)? ;
Name = Letter (Letter / Digit)* Space ;
DiagName = "<" Char++ ">" Space ;
StringLit = ["] Char++ ["] Space ;
CharClass = ("[" / "^[") Char++ "]" Space ;
Range = "[" Char "-" Char "]" Space ;
Char = Escape
/ ^[\r\n\\] ;
Escape = "\\u" HexDigit HexDigit HexDigit HexDigit
/ "\\t"
/ "\\n"
/ "\\r"
/ !"\\u""\\"_ ;
Letter = [a-z] / [A-Z] ;
Digit = [0-9] ;
HexDigit = [0-9] / [a-f] / [A-F] ;
PREFIX = [&!] Space ;
SUFFIX = [?*+] Space ;
UNTIL = ("*+" / "++") Space ;
EQUAL = "=" Space ;
SEMI = ";" Space ;
SLASH = "/" Space ;
AND = "&" Space ;
LPAREN = "(" Space ;
RPAREN = ")" Space ;
LWING = "{" Space ;
RWING = "}" Space ;
TILDA = "~" Space ;
ANY = "_" Space ;
Space = ([ \r\n\t] / Comment)* ;
Comment = "//" _*+ EOL ;
EOL = [\r]? [\n] / !_ ;
EOT = !_ ;
\section{Appendix: Helper methods\label{helper}}
These methods provide access to the environment seen by a semantic action.
The following four methods
are inherited from \tx{mouse.runtime.Semantics}.\newline
They call back the parser to access the relevant \Phrase\ objects.
\item[\tx{Phrase }\textbf{lhs}\tx{()}]\upsp\newline
Returns the left-hand side object.
\item[\tx{int }\textbf{rhsSize}\tx{()}]\upsp\newline
Returns the number of right-hand side objects.
\item[\tx{Phrase }\textbf{rhs}\tx{(int i)}]\upsp\newline
Returns the $i$-th element on the right-hand side, $0\le i <\,$\tx{rhsSize()}.
\item[\tx{String }\textbf{rhsText}\tx{(int i,int j)}]\upsp\newline
Returns as one \tx{String} the text
represented by the right-hand side objects $i$ through $j-1$,\newline
where $0\leq i < j \le\,$\tx{rhsSize()}.
The following fifteen methods can be applied to a \Phrase\ object:
\item[\tx{void }\textbf{put}\tx{(Object v)}]\upsp \newline
Inserts $v$ as the semantic value of this \Phrase.
\item[\tx{Object }\textbf{get}\tx{()}]\upsp \newline
Returns the semantic value of this \Phrase.
\item[\tx{String }\textbf{text}\tx{()}]\upsp \newline
Returns the text represented by this \tx{Phrase}.
\item[\tx{char }\textbf{charAt}\tx{(int i)}]\upsp \newline
Returns the $i$-th character of the text represented by this \tx{Phrase}.
\item[\tx{String }\textbf{rule}\tx{()}]\upsp \newline
Returns name of the rule that created this \tx{Phrase}.
\item[\tx{boolean }\textbf{isA}\tx{(String name)}]\upsp \newline
Returns \tx{true} if this \tx{Phrase} was created by rule \textit{name}.
\item[\tx{boolean }\textbf{isTerm}\tx{()}]\upsp \newline
Returns \tx{true} if this \tx{Phrase} was created by a terminal.
\item[\tx{boolean }\textbf{isEmpty}\tx{()}]\upsp \newline
Returns \tx{true} if the text represented by this \tx{Phrase} is empty.
\item[\tx{String }\textbf{where}\tx{(int i)}]\upsp \newline
Returns a printable string describing where in the text being parsed\newline
find the i-th character
of text represented by this \tx{Phrase}.
\item[\tx{String }\textbf{errMsg}\tx{()}]\upsp \newline
Returns the error message contained in this \tx{Phrase}.
\item[\tx{void }\textbf{errClear}\tx{()}]\upsp \newline
Erases the error message contained in this \tx{Phrase}.
\item[\tx{void }\textbf{errAdd}\tx{(String expr,int i)}]\upsp \newline
Updates error message contained in this \tx{Phrase} with information\newline
that expression \textit{expr} failed at the i-th character
of text represented by this \tx{Phrase}.
\item[\tx{void }\textbf{actAdd}\tx{(Deferred act)}]\upsp \newline
Adds to this \Phrase deferred action \tx{act}: a lambda expression implementing
the interface \tx{Deferred}.
\item[\tx{void }\textbf{actClear}\tx{()}]\upsp \newline
Removes all deferred actions saved in this \Phrase.
\item[\tx{void }\textbf{actExec}\tx{()}]\upsp \newline
Executes and removes all deferred actions saved in this \Phrase.
\section{Appendix: Your parser class\label{DocPars}}
These are the methods you can apply to your generated parser.\newline
"\tx{Parser}" and
"\tx{Semantics}" are names of your parser and semantics classes,
\item[\textbf{Parser}\texttt{()}]\upsp \newline
Parser constructor. Instantiates your parser and semantics,
connects semantics object to the parser,
and returns the resulting parser object.\dnsp
\item[\texttt{boolean }\textbf{parse}\texttt{(Source src)}]\upsp \newline
Parses input wrapped into a \tx{Source} object \textit{src}.\newline
Returns \tx{true} if the parse was successful, or \tx{false} otherwise.\dnsp
\item[\texttt{Semantics }\textbf{semantics}\texttt{()}]\upsp \newline
Returns the semantics object associated with the parser.\dnsp
\item[\texttt{void }\textbf{setTrace}\texttt{(String s)}]\upsp \newline
Assigns $s$ to the \tx{trace} field in semantics object.\dnsp
\item[\texttt{void }\textbf{setMemo}\texttt{(int n)}]\upsp \newline
Sets the amount of memoization to $n$, $0 \le n \le 9$.\newline
Can only be applied to a parser generated with option \tx{-M} or \tx{-T}
(see \tx{mouse.Generate} tool).
\section{Appendix: \Mouse\ tools\label{tools}}
\fbox{ \textbf{mouse.Generate}\textit{ arguments}\prop}
Generates parser.\newline
The \textit{arguments} are specified as options according to POSIX syntax:
\item[\tx{-G} \textit{filename}]\ \newline
Identifies the file containing your grammar. Mandatory.\newline
The \textit{filename} need not be a complete path,
just enough to identify the file\newline
in current environment.
It should include file extension, if any.
\item[\tx{-D} \textit{directory}]\ \newline
Identifies target directory to receive the generated file(s).\newline
Optional. If omitted, files are generated in current work directory.\newline
The \textit{directory} need not be a complete path, just enough to identify
the directory\newline
in current environment. The directory must exist.
\item[\tx{-P} \textit{parser}]\ \newline
Specifies name of the parser to be generated. Mandatory.\newline
Must be an unqualified class name.
The tool generates a file named "\textit{parser}\tx{.java}"
in the target directory,