core/parser/scriptparser.h
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| 1 | // Avisynth v2.5. Copyright 2002 Ben Rudiak-Gould et al. | ||
| 2 | // http://avisynth.nl | ||
| 3 | |||
| 4 | // This program is free software; you can redistribute it and/or modify | ||
| 5 | // it under the terms of the GNU General Public License as published by | ||
| 6 | // the Free Software Foundation; either version 2 of the License, or | ||
| 7 | // (at your option) any later version. | ||
| 8 | // | ||
| 9 | // This program is distributed in the hope that it will be useful, | ||
| 10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 12 | // GNU General Public License for more details. | ||
| 13 | // | ||
| 14 | // You should have received a copy of the GNU General Public License | ||
| 15 | // along with this program; if not, write to the Free Software | ||
| 16 | // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA, or visit | ||
| 17 | // http://www.gnu.org/copyleft/gpl.html . | ||
| 18 | // | ||
| 19 | // Linking Avisynth statically or dynamically with other modules is making a | ||
| 20 | // combined work based on Avisynth. Thus, the terms and conditions of the GNU | ||
| 21 | // General Public License cover the whole combination. | ||
| 22 | // | ||
| 23 | // As a special exception, the copyright holders of Avisynth give you | ||
| 24 | // permission to link Avisynth with independent modules that communicate with | ||
| 25 | // Avisynth solely through the interfaces defined in avisynth.h, regardless of the license | ||
| 26 | // terms of these independent modules, and to copy and distribute the | ||
| 27 | // resulting combined work under terms of your choice, provided that | ||
| 28 | // every copy of the combined work is accompanied by a complete copy of | ||
| 29 | // the source code of Avisynth (the version of Avisynth used to produce the | ||
| 30 | // combined work), being distributed under the terms of the GNU General | ||
| 31 | // Public License plus this exception. An independent module is a module | ||
| 32 | // which is not derived from or based on Avisynth, such as 3rd-party filters, | ||
| 33 | // import and export plugins, or graphical user interfaces. | ||
| 34 | |||
| 35 | #ifndef __ScriptParser_H__ | ||
| 36 | #define __ScriptParser_H__ | ||
| 37 | |||
| 38 | #include <avisynth.h> | ||
| 39 | #include "expression.h" | ||
| 40 | #include "tokenizer.h" | ||
| 41 | #include "script.h" | ||
| 42 | |||
| 43 | |||
| 44 | /******************************************************************** | ||
| 45 | ********************************************************************/ | ||
| 46 | |||
| 47 | |||
| 48 | |||
| 49 | class ScriptParser | ||
| 50 | /** | ||
| 51 | * Insert intelligent comment here | ||
| 52 | **/ | ||
| 53 | { | ||
| 54 | public: | ||
| 55 | ScriptParser(IScriptEnvironment* _env, const char* _code, const char* _filename); | ||
| 56 | |||
| 57 | PExpression Parse(void); | ||
| 58 | |||
| 59 | enum {max_args=1024}; | ||
| 60 | // fixme: consider using vectors | ||
| 61 | |||
| 62 | private: | ||
| 63 | IScriptEnvironment2* const env; | ||
| 64 | Tokenizer tokenizer; | ||
| 65 | const char* const code; | ||
| 66 | const char* const filename; | ||
| 67 | int loopDepth; // how many loops are we in during parsing | ||
| 68 | |||
| 69 | void Expect(int op, const char* msg); | ||
| 70 | |||
| 71 | PExpression ParseFunctionDefinition(void); | ||
| 72 | |||
| 73 | PExpression ParseBlock(bool braced, bool *empty); | ||
| 74 | PExpression ParseStatement(bool* stop); | ||
| 75 | PExpression ParseAssignment(void); | ||
| 76 | PExpression ParseAssignmentWithRet(void); | ||
| 77 | PExpression ParseConditional(void); | ||
| 78 | PExpression ParseOr(void); | ||
| 79 | PExpression ParseAnd(void); | ||
| 80 | PExpression ParseComparison(void); | ||
| 81 | PExpression ParseAddition(bool negationOnHold); | ||
| 82 | PExpression ParseMultiplication(bool negationOnHold); | ||
| 83 | PExpression ParseUnary(void); | ||
| 84 | PExpression ParseOOP(void); | ||
| 85 | PExpression ParseArray(PExpression context); | ||
| 86 | PExpression ParseFunction(PExpression context); | ||
| 87 | PExpression ParseCall(PExpression left, PExpression context, bool isArraySpecifier); | ||
| 88 | PExpression ParseAtom(void); | ||
| 89 | |||
| 90 | PExpression ParseIf(void); | ||
| 91 | PExpression ParseWhile(void); | ||
| 92 | PExpression ParseFor(void); | ||
| 93 | |||
| 94 | // helper for ParseComparison | ||
| 95 | int GetTokenAsComparisonOperator(); | ||
| 96 | }; | ||
| 97 | |||
| 98 | // The following allows us to write multi-character tokens as string literals. | ||
| 99 | // Originally, non-conformant multi-character characters were used. | ||
| 100 | // For example: int('012') == 0x303132. Hence, the rightmost character | ||
| 101 | // is placed at the least significant byte. | ||
| 102 | 24 | static constexpr int operator ""_i(const char s[], const size_t len) { | |
| 103 | 24 | int acc = 0; | |
| 104 |
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72 | for (size_t i = 0; i < len; ++i) |
| 105 | 48 | acc = (acc << 8) + (unsigned char) s[i]; | |
| 106 | 24 | return acc; | |
| 107 | } | ||
| 108 | |||
| 109 | |||
| 110 | #endif // __ScriptParser_H__ | ||
| 111 |