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| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef TOOLS_GN_PARSE_TREE_H_ | |
| 6 #define TOOLS_GN_PARSE_TREE_H_ | |
| 7 | |
| 8 #include <vector> | |
| 9 | |
| 10 #include "base/basictypes.h" | |
| 11 #include "base/compiler_specific.h" | |
| 12 #include "base/memory/scoped_ptr.h" | |
| 13 #include "tools/gn/err.h" | |
| 14 #include "tools/gn/token.h" | |
| 15 #include "tools/gn/value.h" | |
| 16 | |
| 17 class AccessorNode; | |
| 18 class BinaryOpNode; | |
| 19 class BlockNode; | |
| 20 class ConditionNode; | |
| 21 class FunctionCallNode; | |
| 22 class IdentifierNode; | |
| 23 class ListNode; | |
| 24 class LiteralNode; | |
| 25 class Scope; | |
| 26 class UnaryOpNode; | |
| 27 | |
| 28 // ParseNode ------------------------------------------------------------------- | |
| 29 | |
| 30 // A node in the AST. | |
| 31 class ParseNode { | |
| 32 public: | |
| 33 ParseNode(); | |
| 34 virtual ~ParseNode(); | |
| 35 | |
| 36 virtual const AccessorNode* AsAccessor() const; | |
| 37 virtual const BinaryOpNode* AsBinaryOp() const; | |
| 38 virtual const BlockNode* AsBlock() const; | |
| 39 virtual const ConditionNode* AsConditionNode() const; | |
| 40 virtual const FunctionCallNode* AsFunctionCall() const; | |
| 41 virtual const IdentifierNode* AsIdentifier() const; | |
| 42 virtual const ListNode* AsList() const; | |
| 43 virtual const LiteralNode* AsLiteral() const; | |
| 44 virtual const UnaryOpNode* AsUnaryOp() const; | |
| 45 | |
| 46 virtual Value Execute(Scope* scope, Err* err) const = 0; | |
| 47 | |
| 48 virtual LocationRange GetRange() const = 0; | |
| 49 | |
| 50 // Returns an error with the given messages and the range set to something | |
| 51 // that indicates this node. | |
| 52 virtual Err MakeErrorDescribing( | |
| 53 const std::string& msg, | |
| 54 const std::string& help = std::string()) const = 0; | |
| 55 | |
| 56 // Prints a representation of this node to the given string, indenting | |
| 57 // by the given number of spaces. | |
| 58 virtual void Print(std::ostream& out, int indent) const = 0; | |
| 59 | |
| 60 private: | |
| 61 DISALLOW_COPY_AND_ASSIGN(ParseNode); | |
| 62 }; | |
| 63 | |
| 64 // AccessorNode ---------------------------------------------------------------- | |
| 65 | |
| 66 // Access an array element. | |
| 67 // | |
| 68 // If we need to add support for member variables like "variable.len" I was | |
| 69 // thinking this would also handle that case. | |
| 70 class AccessorNode : public ParseNode { | |
| 71 public: | |
| 72 AccessorNode(); | |
| 73 virtual ~AccessorNode(); | |
| 74 | |
| 75 virtual const AccessorNode* AsAccessor() const OVERRIDE; | |
| 76 virtual Value Execute(Scope* scope, Err* err) const OVERRIDE; | |
| 77 virtual LocationRange GetRange() const OVERRIDE; | |
| 78 virtual Err MakeErrorDescribing( | |
| 79 const std::string& msg, | |
| 80 const std::string& help = std::string()) const OVERRIDE; | |
| 81 virtual void Print(std::ostream& out, int indent) const OVERRIDE; | |
| 82 | |
| 83 // Base is the thing on the left of the [], currently always required to be | |
| 84 // an identifier token. | |
| 85 const Token& base() const { return base_; } | |
| 86 void set_base(const Token& b) { base_ = b; } | |
| 87 | |
| 88 // Index is the expression inside the []. | |
| 89 const ParseNode* index() const { return index_.get(); } | |
| 90 void set_index(scoped_ptr<ParseNode> i) { index_ = i.Pass(); } | |
| 91 | |
| 92 private: | |
| 93 Token base_; | |
| 94 scoped_ptr<ParseNode> index_; | |
| 95 | |
| 96 DISALLOW_COPY_AND_ASSIGN(AccessorNode); | |
| 97 }; | |
| 98 | |
| 99 // BinaryOpNode ---------------------------------------------------------------- | |
| 100 | |
| 101 class BinaryOpNode : public ParseNode { | |
| 102 public: | |
| 103 BinaryOpNode(); | |
| 104 virtual ~BinaryOpNode(); | |
| 105 | |
| 106 virtual const BinaryOpNode* AsBinaryOp() const OVERRIDE; | |
| 107 virtual Value Execute(Scope* scope, Err* err) const OVERRIDE; | |
| 108 virtual LocationRange GetRange() const OVERRIDE; | |
| 109 virtual Err MakeErrorDescribing( | |
| 110 const std::string& msg, | |
| 111 const std::string& help = std::string()) const OVERRIDE; | |
| 112 virtual void Print(std::ostream& out, int indent) const OVERRIDE; | |
| 113 | |
| 114 const Token& op() const { return op_; } | |
| 115 void set_op(const Token& t) { op_ = t; } | |
| 116 | |
| 117 const ParseNode* left() const { return left_.get(); } | |
| 118 void set_left(scoped_ptr<ParseNode> left) { | |
| 119 left_ = left.Pass(); | |
| 120 } | |
| 121 | |
| 122 const ParseNode* right() const { return right_.get(); } | |
| 123 void set_right(scoped_ptr<ParseNode> right) { | |
| 124 right_ = right.Pass(); | |
| 125 } | |
| 126 | |
| 127 private: | |
| 128 scoped_ptr<ParseNode> left_; | |
| 129 Token op_; | |
| 130 scoped_ptr<ParseNode> right_; | |
| 131 | |
| 132 DISALLOW_COPY_AND_ASSIGN(BinaryOpNode); | |
| 133 }; | |
| 134 | |
| 135 // BlockNode ------------------------------------------------------------------- | |
| 136 | |
| 137 class BlockNode : public ParseNode { | |
| 138 public: | |
| 139 // Set has_scope if this block introduces a nested scope. | |
| 140 BlockNode(bool has_scope); | |
| 141 virtual ~BlockNode(); | |
| 142 | |
| 143 virtual const BlockNode* AsBlock() const OVERRIDE; | |
| 144 virtual Value Execute(Scope* scope, Err* err) const OVERRIDE; | |
| 145 virtual LocationRange GetRange() const OVERRIDE; | |
| 146 virtual Err MakeErrorDescribing( | |
| 147 const std::string& msg, | |
| 148 const std::string& help = std::string()) const OVERRIDE; | |
| 149 virtual void Print(std::ostream& out, int indent) const OVERRIDE; | |
| 150 | |
| 151 void set_begin_token(const Token* t) { begin_token_ = t; } | |
| 152 void set_end_token(const Token* t) { end_token_ = t; } | |
| 153 | |
| 154 const std::vector<ParseNode*>& statements() const { return statements_; } | |
| 155 void append_statement(scoped_ptr<ParseNode> s) { | |
| 156 statements_.push_back(s.release()); | |
| 157 } | |
| 158 | |
| 159 // Doesn't create a nested scope. | |
| 160 Value ExecuteBlockInScope(Scope* our_scope, Err* err) const; | |
| 161 | |
| 162 private: | |
| 163 bool has_scope_; | |
| 164 | |
| 165 // Tokens corresponding to { and }, if any (may be NULL). | |
| 166 const Token* begin_token_; | |
| 167 const Token* end_token_; | |
| 168 | |
| 169 // Owning pointers, use unique_ptr when we can use C++11. | |
| 170 std::vector<ParseNode*> statements_; | |
| 171 | |
| 172 DISALLOW_COPY_AND_ASSIGN(BlockNode); | |
| 173 }; | |
| 174 | |
| 175 // ConditionNode --------------------------------------------------------------- | |
| 176 | |
| 177 class ConditionNode : public ParseNode { | |
| 178 public: | |
| 179 ConditionNode(); | |
| 180 virtual ~ConditionNode(); | |
| 181 | |
| 182 virtual const ConditionNode* AsConditionNode() const OVERRIDE; | |
| 183 virtual Value Execute(Scope* scope, Err* err) const OVERRIDE; | |
| 184 virtual LocationRange GetRange() const OVERRIDE; | |
| 185 virtual Err MakeErrorDescribing( | |
| 186 const std::string& msg, | |
| 187 const std::string& help = std::string()) const OVERRIDE; | |
| 188 virtual void Print(std::ostream& out, int indent) const OVERRIDE; | |
| 189 | |
| 190 void set_if_token(const Token& token) { if_token_ = token; } | |
| 191 | |
| 192 const ParseNode* condition() const { return condition_.get(); } | |
| 193 void set_condition(scoped_ptr<ParseNode> c) { | |
| 194 condition_ = c.Pass(); | |
| 195 } | |
| 196 | |
| 197 const BlockNode* if_true() const { return if_true_.get(); } | |
| 198 void set_if_true(scoped_ptr<BlockNode> t) { | |
| 199 if_true_ = t.Pass(); | |
| 200 } | |
| 201 | |
| 202 // This is either empty, a block (for the else clause), or another | |
| 203 // condition. | |
| 204 const ParseNode* if_false() const { return if_false_.get(); } | |
| 205 void set_if_false(scoped_ptr<ParseNode> f) { | |
| 206 if_false_ = f.Pass(); | |
| 207 } | |
| 208 | |
| 209 private: | |
| 210 // Token corresponding to the "if" string. | |
| 211 Token if_token_; | |
| 212 | |
| 213 scoped_ptr<ParseNode> condition_; // Always non-null. | |
| 214 scoped_ptr<BlockNode> if_true_; // Always non-null. | |
| 215 scoped_ptr<ParseNode> if_false_; // May be null. | |
| 216 | |
| 217 DISALLOW_COPY_AND_ASSIGN(ConditionNode); | |
| 218 }; | |
| 219 | |
| 220 // FunctionCallNode ------------------------------------------------------------ | |
| 221 | |
| 222 class FunctionCallNode : public ParseNode { | |
| 223 public: | |
| 224 FunctionCallNode(); | |
| 225 virtual ~FunctionCallNode(); | |
| 226 | |
| 227 virtual const FunctionCallNode* AsFunctionCall() const OVERRIDE; | |
| 228 virtual Value Execute(Scope* scope, Err* err) const OVERRIDE; | |
| 229 virtual LocationRange GetRange() const OVERRIDE; | |
| 230 virtual Err MakeErrorDescribing( | |
| 231 const std::string& msg, | |
| 232 const std::string& help = std::string()) const OVERRIDE; | |
| 233 virtual void Print(std::ostream& out, int indent) const OVERRIDE; | |
| 234 | |
| 235 const Token& function() const { return function_; } | |
| 236 void set_function(Token t) { function_ = t; } | |
| 237 | |
| 238 const ListNode* args() const { return args_.get(); } | |
| 239 void set_args(scoped_ptr<ListNode> a) { args_ = a.Pass(); } | |
| 240 | |
| 241 const BlockNode* block() const { return block_.get(); } | |
| 242 void set_block(scoped_ptr<BlockNode> b) { block_ = b.Pass(); } | |
| 243 | |
| 244 private: | |
| 245 Token function_; | |
| 246 scoped_ptr<ListNode> args_; | |
| 247 scoped_ptr<BlockNode> block_; // May be null. | |
| 248 | |
| 249 DISALLOW_COPY_AND_ASSIGN(FunctionCallNode); | |
| 250 }; | |
| 251 | |
| 252 // IdentifierNode -------------------------------------------------------------- | |
| 253 | |
| 254 class IdentifierNode : public ParseNode { | |
| 255 public: | |
| 256 IdentifierNode(); | |
| 257 IdentifierNode(const Token& token); | |
| 258 virtual ~IdentifierNode(); | |
| 259 | |
| 260 virtual const IdentifierNode* AsIdentifier() const OVERRIDE; | |
| 261 virtual Value Execute(Scope* scope, Err* err) const OVERRIDE; | |
| 262 virtual LocationRange GetRange() const OVERRIDE; | |
| 263 virtual Err MakeErrorDescribing( | |
| 264 const std::string& msg, | |
| 265 const std::string& help = std::string()) const OVERRIDE; | |
| 266 virtual void Print(std::ostream& out, int indent) const OVERRIDE; | |
| 267 | |
| 268 const Token& value() const { return value_; } | |
| 269 void set_value(const Token& t) { value_ = t; } | |
| 270 | |
| 271 private: | |
| 272 Token value_; | |
| 273 | |
| 274 DISALLOW_COPY_AND_ASSIGN(IdentifierNode); | |
| 275 }; | |
| 276 | |
| 277 // ListNode -------------------------------------------------------------------- | |
| 278 | |
| 279 class ListNode : public ParseNode { | |
| 280 public: | |
| 281 ListNode(); | |
| 282 virtual ~ListNode(); | |
| 283 | |
| 284 virtual const ListNode* AsList() const OVERRIDE; | |
| 285 virtual Value Execute(Scope* scope, Err* err) const OVERRIDE; | |
| 286 virtual LocationRange GetRange() const OVERRIDE; | |
| 287 virtual Err MakeErrorDescribing( | |
| 288 const std::string& msg, | |
| 289 const std::string& help = std::string()) const OVERRIDE; | |
| 290 virtual void Print(std::ostream& out, int indent) const OVERRIDE; | |
| 291 | |
| 292 void set_begin_token(const Token& t) { begin_token_ = t; } | |
| 293 void set_end_token(const Token& t) { end_token_ = t; } | |
| 294 | |
| 295 void append_item(scoped_ptr<ParseNode> s) { | |
| 296 contents_.push_back(s.release()); | |
| 297 } | |
| 298 const std::vector<ParseNode*>& contents() const { return contents_; } | |
| 299 | |
| 300 private: | |
| 301 // Tokens corresponding to the [ and ]. | |
| 302 Token begin_token_; | |
| 303 Token end_token_; | |
| 304 | |
| 305 // Owning pointers, use unique_ptr when we can use C++11. | |
| 306 std::vector<ParseNode*> contents_; | |
| 307 | |
| 308 DISALLOW_COPY_AND_ASSIGN(ListNode); | |
| 309 }; | |
| 310 | |
| 311 // LiteralNode ----------------------------------------------------------------- | |
| 312 | |
| 313 class LiteralNode : public ParseNode { | |
| 314 public: | |
| 315 LiteralNode(); | |
| 316 LiteralNode(const Token& token); | |
| 317 virtual ~LiteralNode(); | |
| 318 | |
| 319 virtual const LiteralNode* AsLiteral() const OVERRIDE; | |
| 320 virtual Value Execute(Scope* scope, Err* err) const OVERRIDE; | |
| 321 virtual LocationRange GetRange() const OVERRIDE; | |
| 322 virtual Err MakeErrorDescribing( | |
| 323 const std::string& msg, | |
| 324 const std::string& help = std::string()) const OVERRIDE; | |
| 325 virtual void Print(std::ostream& out, int indent) const OVERRIDE; | |
| 326 | |
| 327 const Token& value() const { return value_; } | |
| 328 void set_value(const Token& t) { value_ = t; } | |
| 329 | |
| 330 private: | |
| 331 Token value_; | |
| 332 | |
| 333 DISALLOW_COPY_AND_ASSIGN(LiteralNode); | |
| 334 }; | |
| 335 | |
| 336 // UnaryOpNode ----------------------------------------------------------------- | |
| 337 | |
| 338 class UnaryOpNode : public ParseNode { | |
| 339 public: | |
| 340 UnaryOpNode(); | |
| 341 virtual ~UnaryOpNode(); | |
| 342 | |
| 343 virtual const UnaryOpNode* AsUnaryOp() const OVERRIDE; | |
| 344 virtual Value Execute(Scope* scope, Err* err) const OVERRIDE; | |
| 345 virtual LocationRange GetRange() const OVERRIDE; | |
| 346 virtual Err MakeErrorDescribing( | |
| 347 const std::string& msg, | |
| 348 const std::string& help = std::string()) const OVERRIDE; | |
| 349 virtual void Print(std::ostream& out, int indent) const OVERRIDE; | |
| 350 | |
| 351 const Token& op() const { return op_; } | |
| 352 void set_op(const Token& t) { op_ = t; } | |
| 353 | |
| 354 const ParseNode* operand() const { return operand_.get(); } | |
| 355 void set_operand(scoped_ptr<ParseNode> operand) { | |
| 356 operand_ = operand.Pass(); | |
| 357 } | |
| 358 | |
| 359 private: | |
| 360 Token op_; | |
| 361 scoped_ptr<ParseNode> operand_; | |
| 362 | |
| 363 DISALLOW_COPY_AND_ASSIGN(UnaryOpNode); | |
| 364 }; | |
| 365 | |
| 366 #endif // TOOLS_GN_PARSE_TREE_H_ | |
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Chromium Code Reviews
Issue 21084010:
Revert 214254 "Add initial prototype for the GN meta-buildsystem." (Closed)
Base URL: svn://svn.chromium.org/chrome/