js_minify.h

// Copyright 2010 Google Inc. All Rights Reserved.

#ifndef PAGESPEED_KERNEL_JS_JS_MINIFY_H_
#define PAGESPEED_KERNEL_JS_JS_MINIFY_H_

#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/source_map.h"
#include "pagespeed/kernel/base/string.h"
#include "pagespeed/kernel/base/string_util.h"
#include "pagespeed/kernel/js/js_keywords.h"
#include "pagespeed/kernel/js/js_tokenizer.h"

namespace pagespeed {

namespace js {

enum JsWhitespace { kNoWhitespace, kSpace, kLinebreak };

class JsMinifyingTokenizer {
 public:
  JsMinifyingTokenizer(const JsTokenizerPatterns* patterns, StringPiece input);

  JsMinifyingTokenizer(
      const JsTokenizerPatterns* patterns, StringPiece input,
      net_instaweb::source_map::MappingVector* mappings);

  ~JsMinifyingTokenizer();

  JsKeywords::Type NextToken(StringPiece* token_out);

  bool has_error() const { return tokenizer_.has_error(); }

 private:
  JsKeywords::Type NextTokenHelper(
      StringPiece* token_out,
      net_instaweb::source_map::Mapping* token_out_position);

  bool WhitespaceNeededBefore(JsKeywords::Type type, StringPiece token);

  JsTokenizer tokenizer_;
  JsWhitespace whitespace_; 
  JsKeywords::Type prev_type_;
  StringPiece prev_token_;
  JsKeywords::Type next_type_;
  StringPiece next_token_;
  net_instaweb::source_map::MappingVector* mappings_;
  net_instaweb::source_map::Mapping current_position_;
  net_instaweb::source_map::Mapping next_position_;

  
};

bool MinifyUtf8Js(const JsTokenizerPatterns* patterns,
                  StringPiece input, GoogleString* output);

bool MinifyUtf8JsWithSourceMap(
    const JsTokenizerPatterns* patterns,
    StringPiece input, GoogleString* output,
    net_instaweb::source_map::MappingVector* mappings);


bool MinifyJs(const StringPiece& input, GoogleString* out);

bool GetMinifiedJsSize(const StringPiece& input, int* minimized_size);

bool MinifyJsAndCollapseStrings(const StringPiece& input, GoogleString* output);
bool GetMinifiedStringCollapsedJsSize(const StringPiece& input,
                                      int* minimized_size);

}  

}  

#endif