javacc-7.0.3.src.main.resources.templates.TableDrivenTokenManager.template Maven / Gradle / Ivy
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JavaCC is a parser/scanner generator for java.
public class ${parserName}TokenManager ${superClass} implements ${parserName}Constants {
protected ${STATIC?static :}boolean moveToNextChar() {
try {
curChar = input_stream.readChar();
#if IGNORE_CASE
curChar = (int)Character.toLowerCase((char)curChar);
#fi
} catch(java.io.IOException e) {
return false;
}
return true;
}
${decls}
#if TOKEN_MANAGER_USES_PARSER && !STATIC
/* Declarations from the TOKEN_MGR_DECLS section */
/** Constructor with parser. */
public ${parserName}TokenManager (${parserName} parserArg, ${charStreamName} stream){
parser = parserArg;
#else
/** Constructor. */
public ${parserName}TokenManager(${charStreamName} stream){
#fi
#if STATIC && !USER_CHAR_STREAM
if (input_stream != null)
throw new ${LEGACY_EXCEPTION_HANDLING?TokenMgrError:TokenMgrException}("ERROR: Second call to constructor of static lexer. You must use ReInit() to initialize the static variables.", ${LEGACY_EXCEPTION_HANDLING?TokenMgrError:TokenMgrException}.STATIC_LEXER_ERROR);
#elif !USER_CHAR_STREAM
#if JAVA_UNICODE_ESCAPE
if (JavaCharStream.staticFlag)
#else
if (${charStreamName}.staticFlag)
#fi
throw new ${LEGACY_EXCEPTION_HANDLING?Error:RuntimeException}("ERROR: Cannot use a static CharStream class with a non-static lexical analyzer.");
#fi
input_stream = stream;
}
#if TOKEN_MANAGER_USES_PARSER && !STATIC
/** Constructor with parser. */
public ${parserName}TokenManager (${parserName} parserArg, ${charStreamName} stream, int lexState){
ReInit(parserArg, stream);
}
#else
/** Constructor. */
public ${parserName}TokenManager (${charStreamName} stream, int lexState){
ReInit(stream);
SwitchTo(lexState);
}
#fi
/** Reinitialise parser. */
#if TOKEN_MANAGER_USES_PARSER && !STATIC
public void ReInit(${parserName} parserArg, ${charStreamName} stream)
#else
${STATIC?static :}public void ReInit(${charStreamName} stream)
#fi
{
#if TOKEN_MANAGER_USES_PARSER && !STATIC
this.parser = parserArg;
#else
#fi
jjmatchedPos = 0;
curLexState = defaultLexState;
input_stream = stream;
}
/** Reinitialise parser. */
#if TOKEN_MANAGER_USES_PARSER && !STATIC
public void ReInit( ${parserName} parserArg, ${charStreamName} stream, int lexState)
#else
${STATIC?static :}public void ReInit(${charStreamName} stream, int lexState)
#fi
{
#if TOKEN_MANAGER_USES_PARSER && !STATIC
ReInit(parserArg, stream);
#else
ReInit(stream);
#fi
SwitchTo(lexState);
}
/** Switch to specified lex state. */
public ${STATIC?static :}void SwitchTo(int lexState) {
curLexState = lexState;
}
#if !NO_DFA
private ${STATIC?static :}final int jjRunStringLiteralMatch() {
int curPos = 0;
final int key = (int)curLexState << 16 | curChar;
final int[] arr = startAndSize.get(key);
int startState = jjInitStates[curLexState];
if (arr != null) {
int index = arr[0];
for (int i = 0; i < arr[1]; i++) {
final int len = stringLiterals[index++];
#if DEBUG_TOKEN_MANAGER
System.err.println(
"Looking for string literal match of kind: " +
stringLiterals[index + len] +
"; token image: " + tokenImage[stringLiterals[index + len]]);
#fi
do {
#if DEBUG_TOKEN_MANAGER
System.err.println("Cur char: '" + (char)curChar + "'");
#fi
if (curChar != stringLiterals[index + curPos]) break;
if (++curPos == len) break;
if (!moveToNextChar()) {
--curPos;
break;
}
} while(curPos < len);
if (curPos == len) {
jjmatchedKind = stringLiterals[index + len];
jjmatchedPos = curPos;
startState = stringLiterals[index + len + 1];
#if DEBUG_TOKEN_MANAGER
System.err.println(
"Currently matched the first: " + jjmatchedPos +
" chars as kind: " + stringLiterals[index + len] +
"; with image: " + tokenImage[jjmatchedKind]);
#fi
if (!moveToNextChar()) {
return curPos;
}
curPos++;
break;
} else {
index += len + 2;
input_stream.backup(curPos + 1);
curPos = 0;
if (!moveToNextChar()) {
assert(false);
}
}
}
} else {
#if DEBUG_TOKEN_MANAGER
System.err.println(
"No string literal start with char: '" + (char)curChar + "'");
#fi
}
return jjMoveNfa(startState, curPos);
}
#fi
private ${STATIC?static :} int[] stateSet = new int[${generatedStates}];
private ${STATIC?static :} int[] newStateSet = new int[${generatedStates}];
private ${STATIC?static :} final long[] moved = new long[${generatedStates}];
private ${STATIC?static :} long moveIndex = 1L;
private ${STATIC?static :}final int jjMoveNfa(int startState, int curPos) {
if (startState < 0) {
#if DEBUG_TOKEN_MANAGER
System.err.println("No NFA state at pos: " + curPos);
#fi
return curPos;
}
// We have a long array indexed by the NFA state number to roughly indicate
// the input position so when the input reaches part Long.MAX_VALUE (which
// should be extremely rare), we need to reset them all back to zero.
if (++moveIndex == Long.MAX_VALUE) {
for (int i = 0; i < ${generatedStates}; i++) moved[i] = 0L;
moveIndex = 1L;
}
// We initialize the kind to MAX value so that when a match is found, we can
// simply check if it's less than the current match and store it in that
// case. This helps implement the 'first occurring' rule properly.
int kind = Integer.MAX_VALUE;
int cnt = 0;
stateSet[cnt++] = startState;
moved[startState] = moveIndex;
// Some NFA states have epsilon transitions (move on empty string). So we
// just start with all of them. Note that the nextStates array already adds
// the epsilon closure. Only the initial state needs to do this explicitly.
for (int s : jjcompositeState[startState]) {
if (moved[s] != moveIndex) {
stateSet[cnt++] = s;
moved[s] = moveIndex;
}
}
#if DEBUG_TOKEN_MANAGER
System.err.println("Starting NFA with start state: " + startState);
#fi
do {
#if DEBUG_TOKEN_MANAGER
System.err.println("Cur char: '" + (char)curChar + "'");
#fi
int newCnt = 0;
if (++moveIndex == Long.MAX_VALUE) {
for (int i = 0; i < ${generatedStates}; i++) moved[i] = 0L;
moveIndex = 1L;
}
final int vectorIndex = curChar >> 6;
final long bitpattern = (1L << (curChar & 077));
do {
final int state = stateSet[--cnt];
#if DEBUG_TOKEN_MANAGER
// TODO(sreeni) : Fix it to give better error message instead of UNKNOWN.
System.err.println(
"Looking to move from state: " + state + "; for: " +
(jjmatchKinds[state] != Integer.MAX_VALUE
? tokenImage[jjmatchKinds[state]] : " "));
#fi
if ((jjChars[state][vectorIndex] & bitpattern) != 0L) {
// Current input character can move this NFA state. So add all the
// next states of the current states for use with the next input char.
for (int newState : jjnextStateSet[state]) {
if (moved[newState] != moveIndex) {
// We add each state only once.
newStateSet[newCnt++] = newState;
moved[newState] = moveIndex;
}
}
final int newKind = jjmatchKinds[state];
if (kind > newKind) {
// It's a final state so store the matched kind if it's smaller than
// what's already matched.
kind = newKind;
#if DEBUG_TOKEN_MANAGER
System.err.println(
"Found a match of kind: " + kind + "; kind: " +
tokenImage[kind] + " using the first: " + curPos +
" characters.");
#fi
}
}
} while (cnt > 0);
if (kind != Integer.MAX_VALUE) {
// We found a match. So remember the kind and position of the match.
jjmatchedKind = kind;
jjmatchedPos = curPos;
// Reset the kind to max value so we can contine looking for a longer
// match.
kind = Integer.MAX_VALUE;
}
// Swap the current and next state sets.
int[] tmp = stateSet;
stateSet = newStateSet;
newStateSet = tmp;
// Reset the number of states.
cnt = newCnt;
if (newCnt == 0) {
// There were no transitions from any of the current states on the
// current input. So we are done.
#if DEBUG_TOKEN_MANAGER
System.err.println("Done with NFA at pos: " + curPos);
#fi
return curPos;
}
// Read the next character and try to continue running the NFA.
if (!moveToNextChar()) {
// EOF reached!
#if DEBUG_TOKEN_MANAGER
System.err.println("Reached EOF here at pos: " + curPos);
#fi
return curPos;
}
++curPos;
} while (cnt > 0);
assert(false) :
"Interal error. Please submit a bug at: http://javacc.java.net.";
return curPos;
}
private ${STATIC?static :} int defaultLexState = ${defaultLexState};
private ${STATIC?static :} int curLexState = ${defaultLexState};
private ${STATIC?static :} int jjmatchedPos;
private ${STATIC?static :} int jjmatchedKind;
private ${STATIC?static :}final StringBuilder jjimage = new StringBuilder();
private ${STATIC?static :}StringBuilder image = jjimage;
private ${STATIC?static :}int jjimageLen;
private ${STATIC?static :}int lengthOfMatch;
protected ${STATIC?static :}int curChar;
protected ${STATIC?static :} ${charStreamName} input_stream;
public static final boolean isToken(int kind) {
return (jjtoToken[kind >> 6] & (1L << (kind & 077))) != 0L;
}
public static final boolean isSkip(int kind) {
return (jjtoSkip[kind >> 6] & (1L << (kind & 077))) != 0L;
}
public static final boolean isSpecial(int kind) {
return (jjtoSpecial[kind >> 6] & (1L << (kind & 077))) != 0L;
}
public static final boolean isMore(int kind) {
return (jjtoMore[kind >> 6] & (1L << (kind & 077))) != 0L;
}
protected ${STATIC?static :} Token jjFillToken() {
final Token t;
final String curTokenImage;
#if KEEP_LINE_COLUMN
final int beginLine;
final int endLine;
final int beginColumn;
final int endColumn;
#fi
if (jjmatchedPos < 0) {
if (image == null) {
curTokenImage = "";
} else {
curTokenImage = image.toString();
}
#if KEEP_LINE_COLUMN
beginLine = endLine = input_stream.getEndLine();
beginColumn = endColumn = input_stream.getEndColumn();
#fi
} else {
String im = jjstrLiteralImages[jjmatchedKind];
curTokenImage = (im == null) ? input_stream.GetImage() : im;
#if KEEP_LINE_COLUMN
beginLine = input_stream.getBeginLine();
beginColumn = input_stream.getBeginColumn();
endLine = input_stream.getEndLine();
endColumn = input_stream.getEndColumn();
#fi
}
#if TOKEN_FACTORY
t = ${TOKEN_FACTORY}.newToken(jjmatchedKind, curTokenImage);
#elif BINARY_NEW_TOKEN
t = Token.newToken(jjmatchedKind, curTokenImage);
#else
t = Token.newToken(jjmatchedKind);
t.kind = jjmatchedKind;
t.image = curTokenImage;
#fi
#if KEEP_LINE_COLUMN
t.beginLine = beginLine;
t.endLine = endLine;
t.beginColumn = beginColumn;
t.endColumn = endColumn;
#fi
return t;
}
/** Get the next Token. */
public ${STATIC?static :} Token getNextToken() {
Token specialToken = null;
Token matchedToken;
int lastReadPosition = 0;
EOFLoop:
for (;;) {
// First see if we have any input at all.
try {
curChar = input_stream.BeginToken();
#if IGNORE_CASE
curChar = Character.toLowerCase(curChar);
#fi
} catch(Exception e) {
#if DEBUG_TOKEN_MANAGER
if (lexStateNames.length > 1) {
System.err.print("<" + lexStateNames[curLexState] + "> ");
}
System.err.println("Reached EOF at " +
input_stream.getBeginLine() + ":" +
input_stream.getBeginColumn());
#fi
// No input. So return EOF token.
jjmatchedKind = EOF;
jjmatchedPos = -1;
matchedToken = jjFillToken();
matchedToken.specialToken = specialToken;
return matchedToken;
}
#if DEBUG_TOKEN_MANAGER
if (lexStateNames.length > 1) {
System.err.print("<" + lexStateNames[curLexState] + "> ");
}
System.err.println("Current input char: '" + (char)curChar + "' at " +
input_stream.getBeginLine() + ":" +
input_stream.getBeginColumn());
#fi
// Set matched kind to a MAX VALUE to implement largest, first occuring rule
// i.e., smallest kind value matched should be used.
image = jjimage;
image.setLength(0);
jjimageLen = 0;
MoreLoop: for (;;) {
jjmatchedKind = Integer.MAX_VALUE;
jjmatchedPos = 0;
#if DEBUG_TOKEN_MANAGER
if (lexStateNames.length > 1) {
System.err.print("<" + lexStateNames[curLexState] + "> ");
}
System.err.println("Current input char: '" + (char)curChar + "' at " +
input_stream.getBeginLine() + ":" +
input_stream.getBeginColumn());
#fi
#if !NO_DFA
lastReadPosition = jjRunStringLiteralMatch();
#else
lastReadPosition = jjMoveNfa(0, 0);
#fi
if (jjmatchedPos == 0 && jjmatchedKind > canMatchAnyChar[curLexState]) {
jjmatchedKind = canMatchAnyChar[curLexState];
#if DEBUG_TOKEN_MANAGER
System.err.println(
"Matched current char: '" + (char)curChar +
"' as a wildcard kind: " + jjmatchedKind);
#fi
}
if (jjmatchedKind != Integer.MAX_VALUE) {
// We have a match!
// Put back any characters looked ahead.
input_stream.backup(lastReadPosition - jjmatchedPos);
if (isToken(jjmatchedKind)) {
#if DEBUG_TOKEN_MANAGER
System.err.println("Returning token.");
#fi
// Matched kind is a real TOKEN.
matchedToken = jjFillToken();
matchedToken.specialToken = specialToken;
TokenLexicalActions(matchedToken);
if (jjnewLexState[jjmatchedKind] != -1) {
curLexState = jjnewLexState[jjmatchedKind];
}
#if COMMON_TOKEN_ACTION
CommonTokenAction(matchedToken);
#fi
return matchedToken;
} else if (isSkip(jjmatchedKind)) {
#if DEBUG_TOKEN_MANAGER
System.err.println("Found a SKIP match.");
#fi
// Matched kind is a SKIP or SPECIAL_TOKEN.
if (isSpecial(jjmatchedKind)) {
matchedToken = jjFillToken();
if (specialToken == null) {
specialToken = matchedToken;
} else {
matchedToken.specialToken = specialToken;
specialToken = (specialToken.next = matchedToken);
}
SkipLexicalActions(matchedToken);
} else {
SkipLexicalActions(null);
}
if (jjnewLexState[jjmatchedKind] != -1) {
curLexState = jjnewLexState[jjmatchedKind];
}
continue EOFLoop;
}
#if DEBUG_TOKEN_MANAGER
System.err.println("Found a MORE match.");
#fi
// Here it's a MORE.
MoreLexicalActions();
if (jjnewLexState[jjmatchedKind] != -1) {
curLexState = jjnewLexState[jjmatchedKind];
}
lastReadPosition = 0;
jjmatchedKind = 0x7fffffff;
try {
curChar = input_stream.readChar();
continue;
}
catch (java.io.IOException e1) { }
}
reportError(lastReadPosition);
}
}
}
protected ${STATIC?static :} void reportError(int lastReadPosition) {
int error_line = input_stream.getEndLine();
int error_column = input_stream.getEndColumn();
String error_after = null;
boolean EOFSeen = false;
try {
input_stream.readChar();
input_stream.backup(1);
} catch (java.io.IOException e1) {
EOFSeen = true;
error_after = lastReadPosition <= 1 ? "" : input_stream.GetImage();
if (curChar == '\n' || curChar == '\r') {
error_line++;
error_column = 0;
}
else
error_column++;
}
if (!EOFSeen) {
input_stream.backup(1);
error_after = lastReadPosition <= 1 ? "" : input_stream.GetImage();
}
throw new TokenMgrError(EOFSeen, curLexState, error_line, error_column,
error_after, curChar, TokenMgrError.LEXICAL_ERROR);
}
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