diff --git a/Ebnf2ps.cabal b/Ebnf2ps.cabal --- a/Ebnf2ps.cabal +++ b/Ebnf2ps.cabal @@ -1,5 +1,5 @@ Name: Ebnf2ps -Version: 1.0.8 +Version: 1.0.9 Synopsis: Peter's Syntax Diagram Drawing Tool Homepage: http://www.informatik.uni-freiburg.de/~thiemann/haskell/ebnf2ps/ License: BSD3 @@ -16,6 +16,14 @@ immediatedly included in TeX/LaTeX documents and in texts created with other popular document preparation systems. + +Extra-source-files: examples/ebnf.BNF examples/gofer.BNF examples/regular.BNF, + doc/Atom.eps, doc/ExtAtom.eps, doc/Factor.eps, doc/File.eps, + doc/Production_unfold.eps, doc/Nonterminal.eps, + doc/Production.eps, doc/String.eps, doc/Term.eps, doc/Character.eps, doc/Atom_unfold.eps, + doc/RAtom.eps, doc/RAtom_unfold.eps, doc/Export.eps, + doc/RExtAtom.eps, doc/RFactor.eps, doc/Regexp.eps, + doc/doc.tex, doc/doc.ps Executable ebnf2ps Main-is: Ebnf2ps.hs diff --git a/doc/Atom.eps b/doc/Atom.eps new file mode 100644 --- /dev/null +++ b/doc/Atom.eps @@ -0,0 +1,152 @@ 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##1\hfill}}} + {\end{list}} +\newcommand{\new}{% + {\ooalign {\hfil \raise .09ex + \hbox {n}\hfil \crcr\mathhexbox 20D}}} + +\begin{document} +\title{Ebnf2ps --- Automatic Railroad Diagram Drawing\\ + Version 1.01} +\author{ + Peter Thiemann, Michael Walter\\ + Wilhelm-Schickard-Institut, Universität Tübingen\\ + Sand 13, 72076 Tübingen\\ + E-mail: \texttt{\{thiemann,walterm\}@informatik.uni-tuebingen.de} \\ + \copyright 1996, Peter Thiemann} +\maketitle + +Ebnf2ps was written to fill an urgent need of the author: to produce lots of +syntax diagrams (railroad diagrams) from a grammar in EBNF notation in short +time. Over the time the program has acquired a couple of features in order to +fulfill a variety of requirements. The current version produces highly readable +railroad diagrams from grammars in various formats: Yacc, Happy and +EBNF. \\ +The program may be freely used and distributed, you are however required not to +remove the copyright notices from the source files. Please send any comments, +bugs, etc.\ to the author(s). + + + +\section{How to build it} + +Ebnf2ps was written in Haskell, a non--strict, purely functional +programming language. To build Ebnf2ps you need a Haskell Compiler, +for example the Glasgow Haskell Compilation System +\texttt{ghc}\footnote{GHC home page URL + \texttt{http://www.dcs.glasgow.ac.uk/fp/software/ghc.html}.} or the +Haskell Compiler \texttt{hbc} by Lennart Augustsson. + +\begin{enumerate} +\item Edit the Makefile to reflect your Haskell compiler, for example +\begin{verbatim} + HC= ghc +\end{verbatim} +\item Find out where your \TeX\ installation stores \texttt{.afm}-files (Adobe + font metric files). Then you can change the variable \texttt{AFMPATH} in the + Makefile or you can set the environment variable \texttt{AFMPATH} when running + the program. The \texttt{.afm}-files are absolutely necessary. If you don't + find them complain to your system administrator or get them yourself + from \\ + \texttt{ftp://ftp.adobe.com/pub/adobe/AFMFiles/}. +\item + Change the variable \texttt{RGBPATH} to contain the directory where + your X installation stores its color data base (usually + \texttt{/usr/lib/X11/rgb.txt}). This can also be corrected later with the + environment variable \texttt{RGBPATH}. There are fallback color definitions + for the 8 \emph{digital} colors (black, white, blue, green, cyan, red, magenta, + yellow), so nothing needs be done if that's enough for you. +\item + Typing \texttt{make} should produce an executable file named Ebnf2ps. +\end{enumerate} + + + +\section{How to use it} + +The syntax is +\begin{verbatim} +Ebnf2ps [options] Grammarfile Nonterminal ... [-- Nonterminal ...] +\end{verbatim} +where the \texttt{options} are described in Sec.~\ref{sec:options}, the syntax +of the input file \texttt{Grammarfile} in Sec.~\ref{sec:syntax}, and +\texttt{Nonterminal} describes the nonterminals, for which diagrams are to be +generated, as regular expressions (see Sec.~\ref{sec:regular}). The nonterminals +after the symbol \verb|--| are used only with the option \texttt{+unfold} (see +Sec.~\ref{sec:options} and \ref{sec:unfold}). + + +\subsection{Options} +\label{sec:options} + +The following list shows all \textbf{options} with their \emph{parameters} and +their (default values). All distances and sizes measured in 1/100 point (1 point +is about 1/72 inch). Changes with respect to the last version of Ebnf2ps: +some \new{}ew features, extension of grammar transformations and bug fixes. + +\begin{bfscript}{\qquad} +\item[-titleFont \emph{font}] (Times-Roman) PostScript font used for titles + of diagrams, any font goes here that your printer knows and for which you have + fetched the AFM files. Figure \ref{fig:AFMfonts} shows a sample list of font + names. \new +\item[-titleScale \emph{int}] (10) Pointsize of typeface for titles of diagrams.\new +\item[-titleColor \emph{color}] (black) Color of typeface for titles of diagrams. \new +\item[-ntFont \emph{font}] (Times-Roman) PostScript font used for nonterminals. +\item[-ntScale \emph{int}] (10) Pointsize of typeface for nonterminals. +\item[-ntColor \emph{color}] (black) Color of typeface for nonterminals. +\item[-ntBg \emph{color}] (white) Background color of typeface for nonterminals.\new +\item[-ntBoxColor \emph{color}] (black) Color used for outlines of boxes (nonterminals).\new +\item[-tFont \emph{font}] (Times-Roman) PostScript font used for terminal strings. +\item[-tScale \emph{int}] (10) Pointsize of typeface for terminals. +\item[-tColor \emph{color}] (black) Color of typeface for terminals. +\item[-tBg \emph{color}] (white) Background color of typeface for terminals.\new +\item[-tBoxColor \emph{color}] (black) Color used for outlines of boxes (terminals).\new +\item[-borderDistX \emph{int}] (500) Horizontal distance of objects from their container. +\item[-borderDistY \emph{int}] (500) Vertical distance of objects from their container. +\item[-lineWidth \emph{int}] (30) Width of lines used for connecting lines. +\item[-fatLineWidth \emph{int}] (100) Width of lines used for drawing boxes. +\item[-lineColor \emph{color}] (black) Color used for connecting lines. +\item[-arrowSize \emph{int}] (200) Size of (invisible) box containing an arrow. +\item[-rgbFileName \emph{filename}] (rgb.txt) File name for color definitions. +\item[-happy] Accept happy format input files. Happy, written by Andy Gill and Simon Marlow, + is a parser generator system (LALR(1)) for Haskell, similar to the tool yacc for C\footnote{The + program Happy is available by FTP from \texttt{ftp.dcs.glasgow.ac.uk} in \texttt{pub/haskell/happy}}. +\item[-yacc] Accept yacc/bison format input files.\new +\item[+ps] Produce encapsulated PostScript output (default). +\item[+fig] Produce fig output (FORMAT 3.1). +\item[+ebnf] Produce grammar in EBNF notation (file extension ".BNF") for yacc or happy + input format files.\new +\item[+simplify] Simplify productions (experimental, default: don't). +\item[+unfold] Replace nonterminals in productions (experimental, default: don't). + See Sec.~\ref{sec:unfold}.\new +\item[-verbose] Prints some progress messages. +\item[-help] Prints a brief description of the command line, the options with their defaults, + and the environment variables. +\end{bfscript} + +\begin{figure} + \begin{center} + \begin{tabular}{|l|l|l|} \hline + AGaramond-Bold & AGaramond-BoldItalic \\ + AGaramond-Italic & AGaramond-Regular \\ + AGaramond-Semibold & AGaramond-SemiboldItalic \\ + AGaramondAlt-Italic & AGaramondAlt-Regular \\ + AGaramondExp-Bold & AGaramondExp-BoldItalic \\ + AGaramondExp-Italic & AGaramondExp-Semibold \\ + AGaramondExp-SemiboldItalic & AvantGarde-Book \\ + AvantGarde-BookOblique & AvantGarde-Demi \\ + AvantGarde-DemiOblique & Bookman-Demi \\ + Bookman-DemiItalic & Bookman-Light \\ + Bookman-LightItalic & Courier-Bold \\ + Courier-BoldOblique & Courier-Oblique \\ + Courier & Helvetica-Bold \\ + Helvetica-BoldOblique & Helvetica-Narrow-Bold \\ + Helvetica-Narrow-BoldOblique & Helvetica-Narrow-Oblique \\ + Helvetica-Narrow & Helvetica-Oblique \\ + Helvetica & NewCenturySchlbk-Bold \\ + NewCenturySchlbk-BoldItalic & NewCenturySchlbk-Italic \\ + NewCenturySchlbk-Roman & Optima-Bold \\ + Optima & Palatino-Bold \\ + Palatino-BoldItalic & Palatino-Italic \\ + Palatino-Oblique & Palatino-Roman \\ + StoneInformal-Bold & StoneInformal-BoldItalic \\ + StoneInformal-Italic & StoneInformal-Semibold \\ + StoneInformal-SemiboldItalic & StoneInformal \\ + StoneSans & StoneSerif-Bold \\ + StoneSerif-BoldItalic & StoneSerif-Italic \\ + StoneSerif-Semibold & StoneSerif-SemiboldItalic \\ + StoneSerif & Symbol \\ + Times-Bold & Times-BoldItalic \\ + Times-Italic & Times-Oblique \\ + Times-Roman & ZapfChancery-MediumItalic \\ + ZapfDingbats & \\ \hline + \end{tabular} + \end{center} + \caption{Sample list of font names} + \label{fig:AFMfonts} +\end{figure} + + +\subsection{Syntax of EBNF Files} +\label{sec:syntax} + +The following grammar and diagrams describe the standard input format (e.g. without +\textbf{-yacc} or \textbf{-happy}) as well as the output format with the \textbf{+ebnf} +option. + +\begin{verbatim} +File = {Production}; +Production = Nonterminal [ String ] "=" Term ";" ; +Term = Factor / "|" ; # alternative +Factor = ExtAtom + ; # sequence +ExtAtom = Atom + | Atom "/" Atom # repetition through Atom + | Atom "+"; # at least one repetition +Atom = Nonterminal + | String # terminal string + | "(" Term ")" + | "[" Term "]" # an optional Term + | "{" Term "}" # zero or more repetitions + ; +String = "\"" { Character } "\"" ; +Nonterminal = letter { letter | digit | "_" | "." } ; +Character = character + | ["\\"] anycharacter ; +\end{verbatim} + +Or in terms of diagrams (what would you expect): +\begin{flushleft} + \leavevmode\epsfbox{File.eps} + \\ + \leavevmode\epsfbox{Production.eps} + \\ + \leavevmode\epsfbox{Term.eps} + \\ + \leavevmode\epsfbox{Factor.eps} + \\ + \leavevmode\epsfbox{ExtAtom.eps} + \\ + \leavevmode\epsfbox{Atom.eps} + \\ + \leavevmode\epsfbox{String.eps} + \\ + \leavevmode\epsfbox{Nonterminal.eps} + \\ + \leavevmode\epsfbox{Character.eps} +\end{flushleft} + +\noindent These diagrams have been produced with \texttt{Ebnf2ps + -tFont Courier-Bold -tBg Black -tColor White -fatLineWidth 50 + ebnf.BNF '.*'}. + + +\subsection{Syntax of regular expressions} +\label{sec:regular} + +The regular expressions used to select nonterminal symbols have the following +syntax, which is similar to the regular expression syntax of \texttt{grep}. + +\begin{verbatim} +Regexp = RFactor / "\\|" ["$"]; +RFactor = RExtAtom + ; +RExtAtom = RAtom ["*" | "+" | "?"] ; +RAtom = character | "\\" character | "." | "\\(" Regexp "\\)" ; +\end{verbatim} + +Regular expressions \texttt{Regexp} may be joined by the infix +operator \texttt{|}. The resulting regular expression matches any +string matching either subexpression. A subexpression may be enclosed +in parenthesis \verb|\(|, \verb|\)| to override precedence rules. +Repetition takes precedence over concatenation, which in turn takes +precedence over alternation. A regular expression matching a single +character may be followed by one of several repetition operators: + +\begin{description} +\item[\texttt{?}] The preceding item is optional and matched at most once. +\item[\texttt{*}] The preceding item will be matched zero or more times. +\item[\texttt{+}] The preceding item will be matched one or more times. +\end{description} +The period \texttt{.} matches any single character, and the dollar sign +\verb|$| match the empty string at the end of a line. Well, graphically, +the syntax is\footnote{The diagrams have been produced with:\\ +\texttt{Ebnf2ps -titleFont AvantGarde-Book -ntBoxColor White -fatLineWidth +50 regular.BNF '.*'}}: + +\begin{flushleft} + \leavevmode\epsfbox{Regexp.eps} + \\ + \leavevmode\epsfbox{RFactor.eps} + \\ + \leavevmode\epsfbox{RExtAtom.eps} + \\ + \leavevmode\epsfbox{RAtom.eps} +\end{flushleft} + + + +\subsection{Option +unfold} +\label{sec:unfold} + +The option \textbf{+unfold} allows the replacement of nonterminal +symbols in productions, through the "right side" of the production of +corresponding nonterminals. The nonterminals, which follows the symbol +\verb|--| in a command line could be specified by their full names, +or by regular expressions (see Sec.~\ref{sec:regular}). An example: +with the grammar \texttt{regular.BNF} for the regular expression +syntax in section~\ref{sec:regular} should be generated a diagram for +\texttt{RAtom}, with a replacement of nonterminal \texttt{Regexp}. +The following diagram is been produced with \texttt{Ebnf2ps +unfold +regular.BNF RAtom -- Regexp}. + +\begin{flushleft} + \leavevmode\epsfbox{RAtom_unfold.eps} +\end{flushleft} + +The following example illustrates the use of regular expressions with +the option \texttt{+unfold}. In all productions of the grammar file +\texttt{ebnf.BNF} --- which describes the syntax of EBNF files (see +Sec.~\ref{sec:syntax}) --- the nonterminal \texttt{String} and all +nonterminals that match the pattern +\begin{verbatim} + .*\(t\|T\)erm.* +\end{verbatim} +\noindent should be replaced. The next lines shows the command to produce +the railroad diagrams and the progress messages of Ebnf2ps. + +{\fontsize{8}{9pt} +\begin{verbatim} +% Ebnf2ps -verbose -tScale 8 -ntScale 8 +unfold ebnf.BNF '.*' -- String '.*\(t\|T\)erm.*' +using colors: + ntColor (0,0,0) + tColor (0,0,0) + lineColor (0,0,0) + ntBoxColor (0,0,0) + tBoxColor (0,0,0) + ntBg (255,255,255) + tBg (255,255,255) + titleColor (0,0,0) +from rgbPathDefault: ["/usr/lib/X11", "/usr/local/X11R5/lib/X11"] +generating nonterminals: [".*"] +from ebnf.BNF +using input path ["."] +using ebnfInput +unfold nonterminals: + Nonterminal + String + Term +in the following productions + Production + Atom +produce layout and output +\end{verbatim} +} + +\noindent Well, graphically that is: +\begin{flushleft} + \leavevmode\epsfbox{Atom_unfold.eps}\\ + \leavevmode\epsfbox{Production_unfold.eps} +\end{flushleft} + +% +\subsection{Environment variables} + +The format of search pathes is a colon separated list of directories. The +default path is inserted in place of an empty directory in the list. Any file +name starting with \texttt{/} is taken as an absolute name and any file name +starting with \texttt{.} is taken relative to the current working directory. + +\begin{description} +\item[AFMPATH] search path for Adobe font metric files. +\item[EBNFINPUTS] search path for grammar input files. +\item[RGBPATH] search path for the color definitions. +\end{description} + + +\section{How to change it} + +In order to add new options to the program you will need a modified copy of the +program \texttt{Mkhprog} with kind permission of the author Nick North +(\texttt{ndn@seg.npl.co.uk}) which is available from URL +\begin{verbatim} +http://www-pu.informatik.uni-tuebingen.de/users/thiemann/haskell/ebnf2ps/ +\end{verbatim} + +\end{document} +%% + diff --git a/examples/ebnf.BNF b/examples/ebnf.BNF new file mode 100644 --- /dev/null +++ b/examples/ebnf.BNF @@ -0,0 +1,17 @@ +File = {Production}; +Production = Nonterminal [ String ] "=" Term ";" ; +Term = Factor / "|" ; # alternative +Factor = ExtAtom + ; # sequence +ExtAtom = Atom + | Atom "/" Atom # repetion through Atom + | Atom "+"; # at least one repetion +Atom = Nonterminal + | String # terminal string + | "(" Term ")" + | "[" Term "]" # an optional Term + | "{" Term "}" # zero or more repetions + ; +String = "\"" { Character } "\"" ; +Nonterminal = letter { letter | digit | "_" | "." } ; +Character = character + | ["\\"] anycharacter ; diff --git a/examples/gofer.BNF b/examples/gofer.BNF new file mode 100644 --- /dev/null +++ b/examples/gofer.BNF @@ -0,0 +1,292 @@ +#APPENDIX A: SUMMARY OF GRAMMAR +# +#This section gives a summary of the grammar for the language used by +#Gofer. The non-terminals and describe the syntax of +#expressions that can be entered into the Gofer interpreter and that of +#files of definitions that can be loaded into Gofer respectively. +# +#The following notational conventions are used in the Grammar which is +#specified using a variant of BNF: +# +# o are used to distinguish names of nonterminals from +# keywords. +# +# o vertical | bars are used to separate alternatives. +# +# o {braces} enclose items which may be repeated zero or more times. +# +# o [brackets] are used for optional items. +# +# o (parentheses) are used for grouping. +# +# o "quotes" surround characters which might otherwise be confused with +# the notations introduced above. +# +#The following terminal symbols are used but not defined by the grammar: +# +# varid identifier beginning with lower case letter as described in +# section 6. +# conid like varid, but beginning with upper case letter. +# varsym operator symbol not beginning with a colon, as described in +# section 6. +# consym constructor function operator, like varsym, but beginning +# with a colon character. +# integer integer constant, as described in section 7.3. +# float floating point constant, as described in section 7.4. +# char character constant, as described in section 7.5. +# string string constant, as described in section 7.7. +# +# +#Top-level grammar +#----------------- +# + module = ( "{" topdecls "}" # module +# + ); + interp = ( exp [whereClause] # top-level expression +# + ); + topdecls = ( topdecls ";" topdecls # multiple declarations + | dataDecl + | typeDecl + | infixDecl + | primDecl + | class # class declaration + | inst # instance declaration + | decls # value declarations +# + ); +dataDecl = ("data" conid {varid} "=" (constr)/"|" # datatype declaration + ); +typeDecl = ("type" conid {varid} "=" type # synonym declaration + ); +infixDecl = (( "infixl" | "infixr" | "infix") + [digit] (op)/"," # fixity declarations + ); +# simple = ( conid {varid} # type declaration lhs +# ); +# + constrs = ( constrs "|" constrs # multiple constructors + | type consym type # infix constructor + | conid {type} # constructor, n>=0 + ); + constr = type consym type # infix constructor + | conid {type} # constructor, n>=0 + ; +# +primDecl = ("primitive" prims "::" type # primitive bindings + ); + prims = + (var string)/"," # primitive binding + ; +# +#Type expressions +#---------------- +# + sigType = ( [context "=>" ] type # [qualified] type +# + ); + context = ( "(" [(pred)/ "," ] ")" # general form + | pred # singleton context + ); + pred = ( conid (type)+ # predicate +# + ); + type = ( ctype [ "->" type ] # function type + ); + ctype = ( conid {atype} # datatype or synonym + | atype + ); + atype = ( varid # type variable + | "(" ")" # unit type + | "(" type ")" # parenthesised type + | "(" type "," (type)/"," ")"# tuple type + | "[" type "]" # list type +# +#Class and instance declarations +#------------------------------- +# + ); + class = ( "class" [context "=>"] pred [cbody] + ); + cbody = ( "where" "{" cdecls "}" # class body + ); + cdecls = ( cdecls ";" cdecls # multiple declarations + | (var)/ "," "::" type # member functions + | fun rhs [whereClause] # default bindings +# + ); + inst = ( "instance" [context "=>"] pred [ibody] + ); + ibody = ( "where" "{" idecls "}" # instance body + ); + idecls = ( idecls ";" idecls # multiple declarations + | fun rhs [whereClause] # member definition +# +#Value declarations +#------------------ +# + ); + decls = ( decls ";" decls #multiple declarations + | (var)/"," "::" sigType #type declaration + | fun rhs [whereClause] #function binding + | lhsPat rhs [whereClause] #pattern binding, PJT: was pat +# + ); + rhs = ( "=" exp #simple right hand side + | (gdRhs)+ #guarded right hand sides +# + ); + gdRhs = ( "|" exp "=" exp #guarded right hand side +# + ); + whereClause = ( "where" "{" decls "}" #local definitions +# + ); + fun = ( var #function of arity 0 + | pat varop pat #infix operator + | "(" pat varop ")" #section-like notation + | "(" varop pat ")" + | fun apat #function with argument + | "(" fun ")" #parenthesised lhs + ); +# +#Expressions +#----------- +# + exp = ( "\\" (apat)+ "->" exp #lambda expression + | "let" "{" decls "}" "in" exp #local definition + | "if" exp "then" exp "else" exp #conditional expression + | "case" exp "of" "{" alts "}" #case expression + | opExp "::" sigType #typed expression + | opExp + ); + opExp = ( opExp op opExp #operator application + | pfxExp + ); + pfxExp = ( "-" appExp #negation + | appExp + ); + appExp = ( appExp atomic #function application + | atomic + ); + atomic = ( var #variable + | con #constructor + | integer #integer literal + | float #floating point literal + | char #character literal + | string #string literal + | "(" ")" #unit element + | "(" exp ")" #parenthesised expr. + | "(" exp op ")" #sections + | "(" op exp ")" + | "[" list "]" #list expression + | "(" exp "," (exp)/"," ")" #tuple + ); +# + list = ( [ (exp)/"," ] #enumerated list + | exp "|" quals #list comprehension + | exp ".." #arithmetic sequence + | exp "," exp ".." + | exp ".." exp + | exp "," exp ".." exp + ); + quals = ( quals "," quals #multiple qualifiers + | pat "<-" exp #generator + | "let" "{" decls "}" #local definition + | exp #boolean guard + ); +# + alts = ( alts ";" alts #multiple alternatives + | pat ( "->" exp #single alternative + | (gdAlt)+ #guarded alternatives + ) [whereClause] #alternative + ); +# altRhs = ( "->" exp #single alternative +# | (gdAlt)+ #guarded alternatives +# ); + gdAlt = ( "|" exp "->" exp #guarded alternative + ); +# +#Patterns +#-------- +# + pat = ( pat conop pat #operator application + | (var | "_") "+" integer #(n+k) pattern + | (apat)+ + ); + lhsPat = ( lhsPat conop lhsPat #PJT: left hand sides of pattern bindings + | apat + ); + apat = ( var #variable + | var "@" pat #as pattern + | "~" pat #irrefutable pattern + | "_" #wildcard + | con #constructor + | integer #integer literal + | char #character literal + | string #string literal + | "(" ")" #unit element + | "(" pat ")" #parenthesised expr. + | "(" pat conop ")" #sections + | "(" conop pat ")" + | "[" [ (pat)/"," ] "]" #list + | "(" pat "," (pat)/"," ")" #tuple + ); +# +#Variables and operators +#----------------------- +# + var = ( varid | "(" "-" ")" #variable + | "(" varsym ")" #variable identifier + ); + op = ( varop | conop | "-" #operator + ); +# + varop = ( varsym | "`" varid "`" #variable operator + ); +# + con = ( conid | "(" consym ")" #constructor identifier + ); + conop = ( consym | "`" conid "`" #constructor operator + ); +# +#Finally, PJT's definitions for literals +#--------------------------------------- +# +integer= (digit)+ ; +float = integer "." integer [ ("e" | "E") [ "+"|"-" ] integer ]; + +varsym = ((symbol | preSymbol) { symbol | ":" }); +consym = (":" {symbol | ":"}); + +varid = (small { letter | digit | "_" | "'" }); +conid = (large { letter | digit | "_" | "'" }); +string = "\"" { character } "\"" ; +char = "'" character "'" ; + +character = ( letter | + digit | + symbol | + preSymbol | + ":" | + "\\" ( integer | "n" | "t" | "b" | "\\" | "'" | "\"" ) ); + +# now this is really trivial... + +letter = ( small | large); +small = ( "a"| "b"| "c"| "d"| "e"| "f"| "g"| "h"| "i"| "j"| "k"| "l"| "m"| "n"| "o" + | "p"| "q"| "r"| "s"| "t"| "u"| "v"| "w"| "x"| "y"| "z"); +large = ( "A"| "B"| "C"| "D"| "E"| "F"| "G"| "H"| "I"| "J"| "K"| "L"| "M" + | "N"| "O"| "P"| "Q"| "R"| "S"| "T"| "U"| "V"| "W"| "X"| "Y"| "Z" ); +digit = ( "0"| "1"| "2"| "3"| "4"| "5"| "6"| "7"| "8"| "9" ); +octit = ( "0"| "1"| "2"| "3"| "4"| "5"| "6"| "7" ); +hexit = ( digit | "A"| "B"| "C"| "D"| "E"| "F"| "a"| "b"| "c"| "d"| "e"| "f" ); +cntrl = ( large | "@"| "["| "|"| "]"| "^"| "_" ); +charesc = ( "a"| "b"| "f"| "n"| "r"| "t"| "v"| "\\"| "\""| "'"| "&" ); + +symbol =("!" | "@" | "#" | "$" | "%" | "^" | "&" | "*" | "+" | "." | "/" + | "<" | "=" | ">" | "?" | "\\" | "|"); + +preSymbol = ("-" | "~"); + diff --git a/examples/regular.BNF b/examples/regular.BNF new file mode 100644 --- /dev/null +++ b/examples/regular.BNF @@ -0,0 +1,4 @@ +Regexp = RFactor / "\\|" ["$"]; +RFactor = RExtAtom + ; +RExtAtom = RAtom ["*" | "+" | "?"] ; +RAtom = character | "\\" character | "." | "\\(" Regexp "\\)" ;