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384 lines
11 KiB
Plaintext
384 lines
11 KiB
Plaintext
/*
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* 8/19/2009
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*
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* ScalaTokenMaker.java - Scanner for the Scala programming language.
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*
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* This library is distributed under a modified BSD license. See the included
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* RSyntaxTextArea.License.txt file for details.
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*/
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package org.fife.ui.rsyntaxtextarea.modes;
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import java.io.*;
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import javax.swing.text.Segment;
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import org.fife.ui.rsyntaxtextarea.*;
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/**
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* Scanner for the Scala programming language.<p>
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*
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* This implementation was created using
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* <a href="http://www.jflex.de/">JFlex</a> 1.4.1; however, the generated file
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* was modified for performance. Memory allocation needs to be almost
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* completely removed to be competitive with the handwritten lexers (subclasses
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* of <code>AbstractTokenMaker</code>, so this class has been modified so that
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* Strings are never allocated (via yytext()), and the scanner never has to
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* worry about refilling its buffer (needlessly copying chars around).
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* We can achieve this because RText always scans exactly 1 line of tokens at a
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* time, and hands the scanner this line as an array of characters (a Segment
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* really). Since tokens contain pointers to char arrays instead of Strings
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* holding their contents, there is no need for allocating new memory for
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* Strings.<p>
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*
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* The actual algorithm generated for scanning has, of course, not been
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* modified.<p>
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*
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* If you wish to regenerate this file yourself, keep in mind the following:
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* <ul>
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* <li>The generated <code>ScalaTokenMaker.java</code> file will contain two
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* definitions of both <code>zzRefill</code> and <code>yyreset</code>.
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* You should hand-delete the second of each definition (the ones
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* generated by the lexer), as these generated methods modify the input
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* buffer, which we'll never have to do.</li>
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* <li>You should also change the declaration/definition of zzBuffer to NOT
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* be initialized. This is a needless memory allocation for us since we
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* will be pointing the array somewhere else anyway.</li>
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* <li>You should NOT call <code>yylex()</code> on the generated scanner
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* directly; rather, you should use <code>getTokenList</code> as you would
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* with any other <code>TokenMaker</code> instance.</li>
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* </ul>
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*
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* @author Robert Futrell
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* @version 0.5
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*
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*/
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%%
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%public
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%class ScalaTokenMaker
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%extends AbstractJFlexCTokenMaker
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%unicode
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%type org.fife.ui.rsyntaxtextarea.Token
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%{
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/**
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* Constructor. This must be here because JFlex does not generate a
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* no-parameter constructor.
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*/
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public ScalaTokenMaker() {
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}
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/**
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* Adds the token specified to the current linked list of tokens.
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*
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* @param tokenType The token's type.
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* @see #addToken(int, int, int)
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*/
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private void addHyperlinkToken(int start, int end, int tokenType) {
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int so = start + offsetShift;
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addToken(zzBuffer, start,end, tokenType, so, true);
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}
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/**
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* Adds the token specified to the current linked list of tokens.
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*
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* @param tokenType The token's type.
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*/
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private void addToken(int tokenType) {
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addToken(zzStartRead, zzMarkedPos-1, tokenType);
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}
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/**
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* Adds the token specified to the current linked list of tokens.
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*
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* @param tokenType The token's type.
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* @see #addHyperlinkToken(int, int, int)
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*/
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private void addToken(int start, int end, int tokenType) {
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int so = start + offsetShift;
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addToken(zzBuffer, start,end, tokenType, so, false);
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}
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/**
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* Adds the token specified to the current linked list of tokens.
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*
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* @param array The character array.
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* @param start The starting offset in the array.
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* @param end The ending offset in the array.
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* @param tokenType The token's type.
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* @param startOffset The offset in the document at which this token
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* occurs.
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* @param hyperlink Whether this token is a hyperlink.
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*/
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@Override
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public void addToken(char[] array, int start, int end, int tokenType,
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int startOffset, boolean hyperlink) {
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super.addToken(array, start,end, tokenType, startOffset, hyperlink);
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zzStartRead = zzMarkedPos;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public String[] getLineCommentStartAndEnd(int languageIndex) {
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return new String[] { "//", null };
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}
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/**
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* Returns the first token in the linked list of tokens generated
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* from <code>text</code>. This method must be implemented by
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* subclasses so they can correctly implement syntax highlighting.
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*
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* @param text The text from which to get tokens.
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* @param initialTokenType The token type we should start with.
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* @param startOffset The offset into the document at which
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* <code>text</code> starts.
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* @return The first <code>Token</code> in a linked list representing
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* the syntax highlighted text.
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*/
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public Token getTokenList(Segment text, int initialTokenType, int startOffset) {
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resetTokenList();
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this.offsetShift = -text.offset + startOffset;
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// Start off in the proper state.
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int state = YYINITIAL;
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switch (initialTokenType) {
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case Token.LITERAL_STRING_DOUBLE_QUOTE:
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state = MULTILINE_STRING_DOUBLE;
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break;
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case Token.COMMENT_MULTILINE:
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state = MLC;
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break;
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default:
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state = YYINITIAL;
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}
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s = text;
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start = text.offset;
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try {
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yyreset(zzReader);
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yybegin(state);
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return yylex();
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} catch (IOException ioe) {
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ioe.printStackTrace();
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return new TokenImpl();
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}
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}
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/**
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* Refills the input buffer.
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*
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* @return <code>true</code> if EOF was reached, otherwise
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* <code>false</code>.
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*/
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private boolean zzRefill() {
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return zzCurrentPos>=s.offset+s.count;
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}
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/**
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* Resets the scanner to read from a new input stream.
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* Does not close the old reader.
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*
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* All internal variables are reset, the old input stream
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* <b>cannot</b> be reused (internal buffer is discarded and lost).
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* Lexical state is set to <tt>YY_INITIAL</tt>.
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*
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* @param reader the new input stream
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*/
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public final void yyreset(java.io.Reader reader) {
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// 's' has been updated.
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zzBuffer = s.array;
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/*
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* We replaced the line below with the two below it because zzRefill
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* no longer "refills" the buffer (since the way we do it, it's always
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* "full" the first time through, since it points to the segment's
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* array). So, we assign zzEndRead here.
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*/
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//zzStartRead = zzEndRead = s.offset;
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zzStartRead = s.offset;
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zzEndRead = zzStartRead + s.count - 1;
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zzCurrentPos = zzMarkedPos = zzPushbackPos = s.offset;
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zzLexicalState = YYINITIAL;
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zzReader = reader;
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zzAtBOL = true;
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zzAtEOF = false;
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}
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%}
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/***** BEGIN SCALA-SPECIFIC CHANGES *********/
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Upper = ([A-Z\$\_]) /* Plus Unicode category Lu */
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Lower = ([a-z]) /* Plus Unicode category Ll */
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Letter = ({Upper}|{Lower}) /*Plus Unicode categories Lo, Lt, Nl */
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Digit = ([0-9])
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OpChar = ([^A-Z\$\_a-z0-9\(\[\]\)\. \t\f])
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Op = ({OpChar}+)
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IdRest = (({Letter}|{Digit})*([\_]{Op})?)
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VarId = ({Lower}{IdRest})
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PlainId = ({Upper}{IdRest}|{VarId}) /*|{Op})*/
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Id = ({PlainId}) /*({PlainId}|[\']{StringLit}[\'])*/
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IntegerLiteral = ({Digit}+[Ll]?)
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HexDigit = ({Digit}|[A-Fa-f])
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HexLiteral = ("0x"{HexDigit}+)
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ExponentPart = ([Ee][+\-]?{Digit}+)
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FloatType = ([FfDd])
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FloatingPointLiteral = ({Digit}+[\.]{Digit}*{ExponentPart}?{FloatType}? |
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[\.]{Digit}+{ExponentPart}?{FloatType}? |
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{Digit}+{ExponentPart}{FloatType}? |
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{Digit}+{ExponentPart}?{FloatType})
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UnclosedCharLiteral = ([\']([\\].|[^\\\'])*[^\']?)
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CharLiteral = ({UnclosedCharLiteral}[\'])
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UnclosedStringLiteral = ([\"]([\\].|[^\\\"])*[^\"]?)
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StringLiteral = ({UnclosedStringLiteral}[\"])
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UnclosedBacktickLiteral = ([\`][^\`]+)
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BacktickLiteral = ({UnclosedBacktickLiteral}[\`])
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/* TODO: Multiline strings */
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MLCBegin = ("/*")
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MLCEnd = ("*/")
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LineCommentBegin = ("//")
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/***** END SCALA-SPECIFIC CHANGES *********/
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Whitespace = ([ \t\f]+)
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LineTerminator = ([\n])
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Separator = ([\(\)\{\}\[\]])
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URLGenDelim = ([:\/\?#\[\]@])
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URLSubDelim = ([\!\$&'\(\)\*\+,;=])
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URLUnreserved = ({Letter}|[\_]|{Digit}|[\-\.\~])
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URLCharacter = ({URLGenDelim}|{URLSubDelim}|{URLUnreserved}|[%])
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URLCharacters = ({URLCharacter}*)
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URLEndCharacter = ([\/\$]|{Letter}|{Digit})
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URL = (((https?|f(tp|ile))"://"|"www.")({URLCharacters}{URLEndCharacter})?)
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%state MULTILINE_STRING_DOUBLE
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%state MLC
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%state EOL_COMMENT
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%%
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<YYINITIAL> {
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/* Keywords */
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"abstract" |
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"case" |
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"catch" |
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"class" |
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"def" |
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"do" |
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"else" |
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"extends" |
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"false" |
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"final" |
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"finally" |
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"for" |
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"forSome" |
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"if" |
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"implicit" |
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"import" |
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"lazy" |
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"match" |
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"new" |
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"null" |
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"object" |
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"override" |
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"package" |
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"private" |
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"protected" |
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"requires" |
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"return" |
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"sealed" |
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"super" |
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"this" |
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"throw" |
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"trait" |
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"try" |
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"true" |
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"type" |
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"val" |
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"var" |
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"while" |
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"with" |
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"yield" { addToken(Token.RESERVED_WORD); }
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{LineTerminator} { addNullToken(); return firstToken; }
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{Id} { addToken(Token.IDENTIFIER); }
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{Whitespace} { addToken(Token.WHITESPACE); }
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/* String/Character literals. */
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\"\"\" { start = zzMarkedPos-3; yybegin(MULTILINE_STRING_DOUBLE); }
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{UnclosedCharLiteral} { addToken(Token.ERROR_CHAR); addNullToken(); return firstToken; }
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{CharLiteral} { addToken(Token.LITERAL_CHAR); }
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{UnclosedStringLiteral} { addToken(Token.ERROR_STRING_DOUBLE); addNullToken(); return firstToken; }
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{StringLiteral} { addToken(Token.LITERAL_STRING_DOUBLE_QUOTE); }
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{UnclosedBacktickLiteral} { addToken(Token.ERROR_STRING_DOUBLE); addNullToken(); return firstToken; }
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{BacktickLiteral} { addToken(Token.LITERAL_BACKQUOTE); }
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/* Comment literals. */
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{MLCBegin} { start = zzMarkedPos-2; yybegin(MLC); }
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{LineCommentBegin} { start = zzMarkedPos-2; yybegin(EOL_COMMENT); }
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{Separator} { addToken(Token.SEPARATOR); }
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{IntegerLiteral} { addToken(Token.LITERAL_NUMBER_DECIMAL_INT); }
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{HexLiteral} { addToken(Token.LITERAL_NUMBER_HEXADECIMAL); }
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{FloatingPointLiteral} { addToken(Token.LITERAL_NUMBER_FLOAT); }
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/* Ended with a line not in a string or comment. */
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<<EOF>> { addNullToken(); return firstToken; }
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/* Catch any other (unhandled) characters. */
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. { addToken(Token.IDENTIFIER); }
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}
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<MULTILINE_STRING_DOUBLE> {
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[^\"\\\n]* {}
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\\.? { /* Skip escaped chars, handles case: '\"""'. */ }
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\"\"\" { addToken(start,zzStartRead+2, Token.LITERAL_STRING_DOUBLE_QUOTE); yybegin(YYINITIAL); }
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\" {}
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\n |
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<<EOF>> { addToken(start,zzStartRead-1, Token.LITERAL_STRING_DOUBLE_QUOTE); return firstToken; }
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}
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<MLC> {
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[^hwf\n\*]+ {}
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{URL} { int temp=zzStartRead; addToken(start,zzStartRead-1, Token.COMMENT_MULTILINE); addHyperlinkToken(temp,zzMarkedPos-1, Token.COMMENT_MULTILINE); start = zzMarkedPos; }
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[hwf] {}
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{MLCEnd} { yybegin(YYINITIAL); addToken(start,zzStartRead+1, Token.COMMENT_MULTILINE); }
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\* {}
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\n |
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<<EOF>> { addToken(start,zzStartRead-1, Token.COMMENT_MULTILINE); return firstToken; }
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}
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<EOL_COMMENT> {
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[^hwf\n]+ {}
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{URL} { int temp=zzStartRead; addToken(start,zzStartRead-1, Token.COMMENT_EOL); addHyperlinkToken(temp,zzMarkedPos-1, Token.COMMENT_EOL); start = zzMarkedPos; }
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[hwf] {}
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\n |
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<<EOF>> { addToken(start,zzStartRead-1, Token.COMMENT_EOL); addNullToken(); return firstToken; }
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}
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