mirror of
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237 lines
7.3 KiB
Plaintext
237 lines
7.3 KiB
Plaintext
/*
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* 12/29/2016
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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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* This class splits up text into tokens representing a YAML file.<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>YamlTokenMaker.java</code> file will
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* contain two definitions of both <code>zzRefill</code> and
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* <code>yyreset</code>. You should hand-delete the second of each
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* definition (the ones generated by the lexer), as these generated
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* methods modify the input buffer, which we'll never have to do.
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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.
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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.
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* </ul>
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*
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* @author Robert Futrell
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* @version 0.4
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*
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*/
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%%
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%public
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%class YamlTokenMaker
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%extends AbstractJFlexTokenMaker
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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 YamlTokenMaker() {
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super();
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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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*/
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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);
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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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*/
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@Override
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public void addToken(char[] array, int start, int end, int tokenType, int startOffset) {
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super.addToken(array, start,end, tokenType, startOffset);
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zzStartRead = zzMarkedPos;
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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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@Override
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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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s = text;
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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(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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NonzeroDigit = ([1-9])
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Digit = ("0"|{NonzeroDigit})
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HexDigit = ({Digit}|[A-Fa-f])
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OctalDigit = ([0-7])
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AnyCharacterButApostropheOrBackSlash = ([^\\'])
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AnyCharacterButDoubleQuoteOrBackSlash = ([^\\\"\n])
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EscapedSourceCharacter = ("u"{HexDigit}{HexDigit}{HexDigit}{HexDigit})
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Escape = ("\\"(([btnfr\"'\\])|([0123]{OctalDigit}?{OctalDigit}?)|({OctalDigit}{OctalDigit}?)|{EscapedSourceCharacter}))
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Operator = ([\-:?\.&\*!%@`])
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Separator = ([\(\)\{\}\[\]])
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Separator2 = ([\;,.])
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Identifier = ([^ \t\n\'\"#\-:?\.&\*!%@`\(\)\{\}\[\]\;,.]+)
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Whitespace = ([ \t]+)
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Comment = (#.*)
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CharLiteral = ([\']({AnyCharacterButApostropheOrBackSlash}|{Escape})*[\'])
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UnclosedCharLiteral = ([\'][^\'\n]*)
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ErrorCharLiteral = ({UnclosedCharLiteral}[\'])
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StringLiteral = ([\"]({AnyCharacterButDoubleQuoteOrBackSlash}|{Escape})*[\"])
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UnclosedStringLiteral = ([\"]([\\].|[^\\\"])*[^\"]?)
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ErrorStringLiteral = ({UnclosedStringLiteral}[\"])
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%%
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<YYINITIAL> {
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{Identifier} { addToken(Token.IDENTIFIER); }
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{Whitespace} { addToken(Token.WHITESPACE); }
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{Separator} { addToken(Token.SEPARATOR); }
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{Separator2} { addToken(Token.IDENTIFIER); }
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{Operator} { addToken(Token.OPERATOR); }
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{Comment} { addToken(Token.COMMENT_EOL); }
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{CharLiteral} { addToken(Token.LITERAL_CHAR); }
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{UnclosedCharLiteral} { addToken(Token.ERROR_CHAR); addNullToken(); return firstToken; }
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{ErrorCharLiteral} { addToken(Token.ERROR_CHAR); }
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{StringLiteral} { addToken(Token.LITERAL_STRING_DOUBLE_QUOTE); }
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{UnclosedStringLiteral} { addToken(Token.ERROR_STRING_DOUBLE); addNullToken(); return firstToken; }
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{ErrorStringLiteral} { addToken(Token.ERROR_STRING_DOUBLE); }
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\n |
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<<EOF>> { addNullToken(); return firstToken; }
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}
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