1 | #ifndef INC_TokenStreamRewriteEngine_hpp__ |
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2 | #define INC_TokenStreamRewriteEngine_hpp__ |
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3 | |
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4 | /* ANTLR Translator Generator |
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5 | * Project led by Terence Parr at http://www.jGuru.com |
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6 | * Software rights: http://www.antlr.org/license.html |
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7 | */ |
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8 | |
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9 | #include <string> |
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10 | #include <list> |
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11 | #include <vector> |
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12 | #include <map> |
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13 | #include <utility> |
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14 | #include <iostream> |
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15 | #include <iterator> |
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16 | #include <cassert> |
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17 | #include <algorithm> |
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18 | |
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19 | #include <antlr/config.hpp> |
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20 | |
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21 | #include <antlr/TokenStream.hpp> |
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22 | #include <antlr/TokenWithIndex.hpp> |
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23 | #include <antlr/BitSet.hpp> |
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24 | |
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25 | #ifdef ANTLR_CXX_SUPPORTS_NAMESPACE |
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26 | namespace antlr { |
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27 | #endif |
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28 | |
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29 | /** This token stream tracks the *entire* token stream coming from |
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30 | * a lexer, but does not pass on the whitespace (or whatever else |
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31 | * you want to discard) to the parser. |
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32 | * |
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33 | * This class can then be asked for the ith token in the input stream. |
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34 | * Useful for dumping out the input stream exactly after doing some |
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35 | * augmentation or other manipulations. Tokens are index from 0..n-1 |
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36 | * |
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37 | * You can insert stuff, replace, and delete chunks. Note that the |
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38 | * operations are done lazily--only if you convert the buffer to a |
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39 | * String. This is very efficient because you are not moving data around |
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40 | * all the time. As the buffer of tokens is converted to strings, the |
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41 | * toString() method(s) check to see if there is an operation at the |
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42 | * current index. If so, the operation is done and then normal String |
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43 | * rendering continues on the buffer. This is like having multiple Turing |
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44 | * machine instruction streams (programs) operating on a single input tape. :) |
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45 | * |
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46 | * Since the operations are done lazily at toString-time, operations do not |
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47 | * screw up the token index values. That is, an insert operation at token |
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48 | * index i does not change the index values for tokens i+1..n-1. |
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49 | * |
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50 | * Because operations never actually alter the buffer, you may always get |
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51 | * the original token stream back without undoing anything. Since |
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52 | * the instructions are queued up, you can easily simulate transactions and |
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53 | * roll back any changes if there is an error just by removing instructions. |
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54 | * For example, |
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55 | * |
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56 | * TokenStreamRewriteEngine rewriteEngine = |
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57 | * new TokenStreamRewriteEngine(lexer); |
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58 | * JavaRecognizer parser = new JavaRecognizer(rewriteEngine); |
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59 | * ... |
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60 | * rewriteEngine.insertAfter("pass1", t, "foobar");} |
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61 | * rewriteEngine.insertAfter("pass2", u, "start");} |
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62 | * System.out.println(rewriteEngine.toString("pass1")); |
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63 | * System.out.println(rewriteEngine.toString("pass2")); |
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64 | * |
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65 | * You can also have multiple "instruction streams" and get multiple |
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66 | * rewrites from a single pass over the input. Just name the instruction |
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67 | * streams and use that name again when printing the buffer. This could be |
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68 | * useful for generating a C file and also its header file--all from the |
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69 | * same buffer. |
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70 | * |
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71 | * If you don't use named rewrite streams, a "default" stream is used. |
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72 | * |
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73 | * Terence Parr, parrt@cs.usfca.edu |
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74 | * University of San Francisco |
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75 | * February 2004 |
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76 | */ |
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77 | class TokenStreamRewriteEngine : public TokenStream |
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78 | { |
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79 | public: |
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80 | typedef ANTLR_USE_NAMESPACE(std)vector<antlr::RefTokenWithIndex> token_list; |
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81 | static const char* DEFAULT_PROGRAM_NAME; |
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82 | #ifndef NO_STATIC_CONSTS |
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83 | static const size_t MIN_TOKEN_INDEX; |
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84 | static const int PROGRAM_INIT_SIZE; |
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85 | #else |
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86 | enum { |
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87 | MIN_TOKEN_INDEX = 0, |
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88 | PROGRAM_INIT_SIZE = 100 |
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89 | }; |
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90 | #endif |
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91 | |
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92 | struct tokenToStream { |
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93 | tokenToStream( ANTLR_USE_NAMESPACE(std)ostream& o ) : out(o) {} |
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94 | template <typename T> void operator() ( const T& t ) { |
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95 | out << t->getText(); |
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96 | } |
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97 | ANTLR_USE_NAMESPACE(std)ostream& out; |
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98 | }; |
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99 | |
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100 | class RewriteOperation { |
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101 | protected: |
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102 | RewriteOperation( size_t idx, const ANTLR_USE_NAMESPACE(std)string& txt ) |
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103 | : index(idx), text(txt) |
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104 | { |
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105 | } |
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106 | public: |
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107 | virtual ~RewriteOperation() |
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108 | { |
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109 | } |
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110 | /** Execute the rewrite operation by possibly adding to the buffer. |
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111 | * Return the index of the next token to operate on. |
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112 | */ |
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113 | virtual size_t execute( ANTLR_USE_NAMESPACE(std)ostream& /* out */ ) { |
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114 | return index; |
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115 | } |
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116 | virtual size_t getIndex() const { |
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117 | return index; |
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118 | } |
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119 | virtual const char* type() const { |
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120 | return "RewriteOperation"; |
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121 | } |
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122 | protected: |
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123 | size_t index; |
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124 | ANTLR_USE_NAMESPACE(std)string text; |
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125 | }; |
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126 | |
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127 | struct executeOperation { |
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128 | ANTLR_USE_NAMESPACE(std)ostream& out; |
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129 | executeOperation( ANTLR_USE_NAMESPACE(std)ostream& s ) : out(s) {} |
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130 | void operator () ( RewriteOperation* t ) { |
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131 | t->execute(out); |
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132 | } |
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133 | }; |
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134 | |
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135 | /// list of rewrite operations |
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136 | typedef ANTLR_USE_NAMESPACE(std)list<RewriteOperation*> operation_list; |
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137 | /// map program name to <program counter,program> tuple |
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138 | typedef ANTLR_USE_NAMESPACE(std)map<ANTLR_USE_NAMESPACE(std)string,operation_list> program_map; |
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139 | |
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140 | class InsertBeforeOp : public RewriteOperation |
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141 | { |
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142 | public: |
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143 | InsertBeforeOp( size_t index, const ANTLR_USE_NAMESPACE(std)string& text ) |
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144 | : RewriteOperation(index, text) |
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145 | { |
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146 | } |
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147 | virtual ~InsertBeforeOp() {} |
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148 | virtual size_t execute( ANTLR_USE_NAMESPACE(std)ostream& out ) |
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149 | { |
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150 | out << text; |
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151 | return index; |
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152 | } |
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153 | virtual const char* type() const { |
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154 | return "InsertBeforeOp"; |
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155 | } |
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156 | }; |
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157 | |
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158 | class ReplaceOp : public RewriteOperation |
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159 | { |
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160 | public: |
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161 | ReplaceOp(size_t from, size_t to, ANTLR_USE_NAMESPACE(std)string text) |
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162 | : RewriteOperation(from,text) |
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163 | , lastIndex(to) |
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164 | { |
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165 | } |
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166 | virtual ~ReplaceOp() {} |
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167 | virtual size_t execute( ANTLR_USE_NAMESPACE(std)ostream& out ) { |
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168 | out << text; |
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169 | return lastIndex+1; |
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170 | } |
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171 | virtual const char* type() const { |
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172 | return "ReplaceOp"; |
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173 | } |
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174 | protected: |
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175 | size_t lastIndex; |
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176 | }; |
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177 | |
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178 | class DeleteOp : public ReplaceOp { |
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179 | public: |
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180 | DeleteOp(size_t from, size_t to) |
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181 | : ReplaceOp(from,to,"") |
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182 | { |
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183 | } |
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184 | virtual const char* type() const { |
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185 | return "DeleteOp"; |
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186 | } |
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187 | }; |
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188 | |
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189 | TokenStreamRewriteEngine(TokenStream& upstream); |
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190 | |
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191 | TokenStreamRewriteEngine(TokenStream& upstream, size_t initialSize); |
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192 | |
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193 | RefToken nextToken( void ); |
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194 | |
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195 | void rollback(size_t instructionIndex) { |
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196 | rollback(DEFAULT_PROGRAM_NAME, instructionIndex); |
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197 | } |
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198 | |
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199 | /** Rollback the instruction stream for a program so that |
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200 | * the indicated instruction (via instructionIndex) is no |
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201 | * longer in the stream. UNTESTED! |
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202 | */ |
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203 | void rollback(const ANTLR_USE_NAMESPACE(std)string& programName, |
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204 | size_t instructionIndex ); |
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205 | |
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206 | void deleteProgram() { |
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207 | deleteProgram(DEFAULT_PROGRAM_NAME); |
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208 | } |
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209 | |
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210 | /** Reset the program so that no instructions exist */ |
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211 | void deleteProgram(const ANTLR_USE_NAMESPACE(std)string& programName) { |
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212 | rollback(programName, MIN_TOKEN_INDEX); |
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213 | } |
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214 | |
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215 | void insertAfter( RefTokenWithIndex t, |
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216 | const ANTLR_USE_NAMESPACE(std)string& text ) |
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217 | { |
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218 | insertAfter(DEFAULT_PROGRAM_NAME, t, text); |
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219 | } |
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220 | |
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221 | void insertAfter(size_t index, const ANTLR_USE_NAMESPACE(std)string& text) { |
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222 | insertAfter(DEFAULT_PROGRAM_NAME, index, text); |
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223 | } |
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224 | |
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225 | void insertAfter( const ANTLR_USE_NAMESPACE(std)string& programName, |
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226 | RefTokenWithIndex t, |
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227 | const ANTLR_USE_NAMESPACE(std)string& text ) |
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228 | { |
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229 | insertAfter(programName, t->getIndex(), text); |
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230 | } |
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231 | |
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232 | void insertAfter( const ANTLR_USE_NAMESPACE(std)string& programName, |
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233 | size_t index, |
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234 | const ANTLR_USE_NAMESPACE(std)string& text ) |
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235 | { |
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236 | // to insert after, just insert before next index (even if past end) |
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237 | insertBefore(programName,index+1, text); |
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238 | } |
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239 | |
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240 | void insertBefore( RefTokenWithIndex t, |
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241 | const ANTLR_USE_NAMESPACE(std)string& text ) |
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242 | { |
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243 | // std::cout << "insertBefore index " << t->getIndex() << " " << text << std::endl; |
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244 | insertBefore(DEFAULT_PROGRAM_NAME, t, text); |
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245 | } |
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246 | |
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247 | void insertBefore(size_t index, const ANTLR_USE_NAMESPACE(std)string& text) { |
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248 | insertBefore(DEFAULT_PROGRAM_NAME, index, text); |
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249 | } |
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250 | |
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251 | void insertBefore( const ANTLR_USE_NAMESPACE(std)string& programName, |
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252 | RefTokenWithIndex t, |
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253 | const ANTLR_USE_NAMESPACE(std)string& text ) |
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254 | { |
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255 | insertBefore(programName, t->getIndex(), text); |
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256 | } |
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257 | |
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258 | void insertBefore( const ANTLR_USE_NAMESPACE(std)string& programName, |
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259 | size_t index, |
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260 | const ANTLR_USE_NAMESPACE(std)string& text ) |
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261 | { |
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262 | addToSortedRewriteList(programName, new InsertBeforeOp(index,text)); |
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263 | } |
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264 | |
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265 | void replace(size_t index, const ANTLR_USE_NAMESPACE(std)string& text) |
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266 | { |
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267 | replace(DEFAULT_PROGRAM_NAME, index, index, text); |
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268 | } |
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269 | |
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270 | void replace( size_t from, size_t to, |
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271 | const ANTLR_USE_NAMESPACE(std)string& text) |
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272 | { |
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273 | replace(DEFAULT_PROGRAM_NAME, from, to, text); |
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274 | } |
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275 | |
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276 | void replace( RefTokenWithIndex indexT, |
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277 | const ANTLR_USE_NAMESPACE(std)string& text ) |
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278 | { |
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279 | replace(DEFAULT_PROGRAM_NAME, indexT->getIndex(), indexT->getIndex(), text); |
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280 | } |
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281 | |
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282 | void replace( RefTokenWithIndex from, |
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283 | RefTokenWithIndex to, |
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284 | const ANTLR_USE_NAMESPACE(std)string& text ) |
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285 | { |
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286 | replace(DEFAULT_PROGRAM_NAME, from, to, text); |
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287 | } |
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288 | |
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289 | void replace(const ANTLR_USE_NAMESPACE(std)string& programName, |
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290 | size_t from, size_t to, |
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291 | const ANTLR_USE_NAMESPACE(std)string& text ) |
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292 | { |
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293 | addToSortedRewriteList(programName,new ReplaceOp(from, to, text)); |
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294 | } |
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295 | |
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296 | void replace( const ANTLR_USE_NAMESPACE(std)string& programName, |
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297 | RefTokenWithIndex from, |
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298 | RefTokenWithIndex to, |
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299 | const ANTLR_USE_NAMESPACE(std)string& text ) |
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300 | { |
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301 | replace(programName, |
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302 | from->getIndex(), |
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303 | to->getIndex(), |
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304 | text); |
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305 | } |
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306 | |
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307 | void remove(size_t index) { |
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308 | remove(DEFAULT_PROGRAM_NAME, index, index); |
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309 | } |
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310 | |
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311 | void remove(size_t from, size_t to) { |
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312 | remove(DEFAULT_PROGRAM_NAME, from, to); |
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313 | } |
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314 | |
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315 | void remove(RefTokenWithIndex indexT) { |
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316 | remove(DEFAULT_PROGRAM_NAME, indexT, indexT); |
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317 | } |
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318 | |
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319 | void remove(RefTokenWithIndex from, RefTokenWithIndex to) { |
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320 | remove(DEFAULT_PROGRAM_NAME, from, to); |
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321 | } |
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322 | |
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323 | void remove( const ANTLR_USE_NAMESPACE(std)string& programName, |
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324 | size_t from, size_t to) |
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325 | { |
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326 | replace(programName,from,to,""); |
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327 | } |
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328 | |
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329 | void remove( const ANTLR_USE_NAMESPACE(std)string& programName, |
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330 | RefTokenWithIndex from, RefTokenWithIndex to ) |
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331 | { |
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332 | replace(programName,from,to,""); |
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333 | } |
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334 | |
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335 | void discard(int ttype) { |
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336 | discardMask.add(ttype); |
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337 | } |
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338 | |
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339 | RefToken getToken( size_t i ) |
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340 | { |
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341 | return RefToken(tokens.at(i)); |
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342 | } |
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343 | |
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344 | size_t getTokenStreamSize() const { |
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345 | return tokens.size(); |
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346 | } |
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347 | |
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348 | void originalToStream( ANTLR_USE_NAMESPACE(std)ostream& out ) const { |
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349 | ANTLR_USE_NAMESPACE(std)for_each( tokens.begin(), tokens.end(), tokenToStream(out) ); |
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350 | } |
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351 | |
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352 | void originalToStream( ANTLR_USE_NAMESPACE(std)ostream& out, |
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353 | size_t start, size_t end ) const; |
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354 | |
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355 | void toStream( ANTLR_USE_NAMESPACE(std)ostream& out ) const { |
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356 | toStream( out, MIN_TOKEN_INDEX, getTokenStreamSize()); |
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357 | } |
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358 | |
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359 | void toStream( ANTLR_USE_NAMESPACE(std)ostream& out, |
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360 | const ANTLR_USE_NAMESPACE(std)string& programName ) const |
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361 | { |
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362 | toStream( out, programName, MIN_TOKEN_INDEX, getTokenStreamSize()); |
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363 | } |
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364 | |
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365 | void toStream( ANTLR_USE_NAMESPACE(std)ostream& out, |
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366 | size_t start, size_t end ) const |
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367 | { |
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368 | toStream(out, DEFAULT_PROGRAM_NAME, start, end); |
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369 | } |
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370 | |
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371 | void toStream( ANTLR_USE_NAMESPACE(std)ostream& out, |
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372 | const ANTLR_USE_NAMESPACE(std)string& programName, |
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373 | size_t firstToken, size_t lastToken ) const; |
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374 | |
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375 | void toDebugStream( ANTLR_USE_NAMESPACE(std)ostream& out ) const { |
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376 | toDebugStream( out, MIN_TOKEN_INDEX, getTokenStreamSize()); |
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377 | } |
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378 | |
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379 | void toDebugStream( ANTLR_USE_NAMESPACE(std)ostream& out, |
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380 | size_t start, size_t end ) const; |
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381 | |
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382 | size_t getLastRewriteTokenIndex() const { |
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383 | return getLastRewriteTokenIndex(DEFAULT_PROGRAM_NAME); |
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384 | } |
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385 | |
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386 | /** Return the last index for the program named programName |
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387 | * return 0 if the program does not exist or the program is empty. |
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388 | * (Note this is different from the java implementation that returns -1) |
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389 | */ |
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390 | size_t getLastRewriteTokenIndex(const ANTLR_USE_NAMESPACE(std)string& programName) const { |
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391 | program_map::const_iterator rewrites = programs.find(programName); |
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392 | |
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393 | if( rewrites == programs.end() ) |
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394 | return 0; |
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395 | |
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396 | const operation_list& prog = rewrites->second; |
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397 | if( !prog.empty() ) |
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398 | { |
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399 | operation_list::const_iterator last = prog.end(); |
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400 | --last; |
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401 | return (*last)->getIndex(); |
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402 | } |
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403 | return 0; |
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404 | } |
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405 | |
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406 | protected: |
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407 | /** If op.index > lastRewriteTokenIndexes, just add to the end. |
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408 | * Otherwise, do linear */ |
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409 | void addToSortedRewriteList(RewriteOperation* op) { |
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410 | addToSortedRewriteList(DEFAULT_PROGRAM_NAME, op); |
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411 | } |
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412 | |
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413 | void addToSortedRewriteList( const ANTLR_USE_NAMESPACE(std)string& programName, |
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414 | RewriteOperation* op ); |
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415 | |
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416 | protected: |
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417 | /** Who do we suck tokens from? */ |
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418 | TokenStream& stream; |
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419 | /** track index of tokens */ |
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420 | size_t index; |
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421 | |
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422 | /** Track the incoming list of tokens */ |
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423 | token_list tokens; |
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424 | |
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425 | /** You may have multiple, named streams of rewrite operations. |
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426 | * I'm calling these things "programs." |
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427 | * Maps String (name) -> rewrite (List) |
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428 | */ |
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429 | program_map programs; |
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430 | |
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431 | /** Which (whitespace) token(s) to throw out */ |
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432 | BitSet discardMask; |
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433 | }; |
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434 | |
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435 | #ifdef ANTLR_CXX_SUPPORTS_NAMESPACE |
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436 | } |
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437 | #endif |
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438 | |
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439 | #endif |
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