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| TokenStreamRewriteEngine (TokenStream &upstream) |
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| TokenStreamRewriteEngine (TokenStream &upstream, size_t initialSize) |
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RefToken | nextToken (void) |
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void | rollback (size_t instructionIndex) |
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void | rollback (const std ::string &programName, size_t instructionIndex) |
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void | deleteProgram () |
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void | deleteProgram (const std ::string &programName) |
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void | insertAfter (RefTokenWithIndex t, const std ::string &text) |
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void | insertAfter (size_t index, const std ::string &text) |
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void | insertAfter (const std ::string &programName, RefTokenWithIndex t, const std ::string &text) |
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void | insertAfter (const std ::string &programName, size_t index, const std ::string &text) |
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void | insertBefore (RefTokenWithIndex t, const std ::string &text) |
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void | insertBefore (size_t index, const std ::string &text) |
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void | insertBefore (const std ::string &programName, RefTokenWithIndex t, const std ::string &text) |
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void | insertBefore (const std ::string &programName, size_t index, const std ::string &text) |
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void | replace (size_t index, const std ::string &text) |
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void | replace (size_t from, size_t to, const std ::string &text) |
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void | replace (RefTokenWithIndex indexT, const std ::string &text) |
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void | replace (RefTokenWithIndex from, RefTokenWithIndex to, const std ::string &text) |
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void | replace (const std ::string &programName, size_t from, size_t to, const std ::string &text) |
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void | replace (const std ::string &programName, RefTokenWithIndex from, RefTokenWithIndex to, const std ::string &text) |
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void | remove (size_t index) |
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void | remove (size_t from, size_t to) |
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void | remove (RefTokenWithIndex indexT) |
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void | remove (RefTokenWithIndex from, RefTokenWithIndex to) |
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void | remove (const std ::string &programName, size_t from, size_t to) |
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void | remove (const std ::string &programName, RefTokenWithIndex from, RefTokenWithIndex to) |
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void | discard (int ttype) |
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RefToken | getToken (size_t i) |
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size_t | getTokenStreamSize () const |
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void | originalToStream (std ::ostream &out) const |
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void | originalToStream (std ::ostream &out, size_t start, size_t end) const |
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void | toStream (std ::ostream &out) const |
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void | toStream (std ::ostream &out, const std ::string &programName) const |
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void | toStream (std ::ostream &out, size_t start, size_t end) const |
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void | toStream (std ::ostream &out, const std ::string &programName, size_t firstToken, size_t lastToken) const |
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void | toDebugStream (std ::ostream &out) const |
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void | toDebugStream (std ::ostream &out, size_t start, size_t end) const |
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size_t | getLastRewriteTokenIndex () const |
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size_t | getLastRewriteTokenIndex (const std ::string &programName) const |
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virtual | ~TokenStream () |
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This token stream tracks the entire token stream coming from a lexer, but does not pass on the whitespace (or whatever else you want to discard) to the parser.
This class can then be asked for the ith token in the input stream. Useful for dumping out the input stream exactly after doing some augmentation or other manipulations. Tokens are index from 0..n-1
You can insert stuff, replace, and delete chunks. Note that the operations are done lazily–only if you convert the buffer to a String. This is very efficient because you are not moving data around all the time. As the buffer of tokens is converted to strings, the toString() method(s) check to see if there is an operation at the current index. If so, the operation is done and then normal String rendering continues on the buffer. This is like having multiple Turing machine instruction streams (programs) operating on a single input tape. :)
Since the operations are done lazily at toString-time, operations do not screw up the token index values. That is, an insert operation at token index i does not change the index values for tokens i+1..n-1.
Because operations never actually alter the buffer, you may always get the original token stream back without undoing anything. Since the instructions are queued up, you can easily simulate transactions and roll back any changes if there is an error just by removing instructions. For example,
TokenStreamRewriteEngine rewriteEngine = new TokenStreamRewriteEngine(lexer); JavaRecognizer parser = new JavaRecognizer(rewriteEngine); ... rewriteEngine.insertAfter("pass1", t, "foobar");} rewriteEngine.insertAfter("pass2", u, "start");} System.out.println(rewriteEngine.toString("pass1")); System.out.println(rewriteEngine.toString("pass2"));
You can also have multiple "instruction streams" and get multiple rewrites from a single pass over the input. Just name the instruction streams and use that name again when printing the buffer. This could be useful for generating a C file and also its header file–all from the same buffer.
If you don't use named rewrite streams, a "default" stream is used.
Terence Parr, parrt.nosp@m.@cs..nosp@m.usfca.nosp@m..edu University of San Francisco February 2004