Victor Chang | 7322950 | 2020-09-17 13:39:19 +0100 | [diff] [blame] | 1 | // © 2016 and later: Unicode, Inc. and others. |
| 2 | // License & terms of use: http://www.unicode.org/copyright.html |
| 3 | /******************************************************************** |
| 4 | * COPYRIGHT: |
| 5 | * Copyright (c) 2001-2016, International Business Machines Corporation and |
| 6 | * others. All Rights Reserved. |
| 7 | ********************************************************************/ |
| 8 | |
| 9 | #ifndef RBBINODE_H |
| 10 | #define RBBINODE_H |
| 11 | |
| 12 | #include "unicode/utypes.h" |
| 13 | #include "unicode/unistr.h" |
| 14 | #include "unicode/uobject.h" |
| 15 | |
| 16 | // |
| 17 | // class RBBINode |
| 18 | // |
| 19 | // Represents a node in the parse tree generated when reading |
| 20 | // a rule file. |
| 21 | // |
| 22 | |
| 23 | U_NAMESPACE_BEGIN |
| 24 | |
| 25 | class UnicodeSet; |
| 26 | class UVector; |
| 27 | |
| 28 | class RBBINode : public UMemory { |
| 29 | public: |
| 30 | enum NodeType { |
| 31 | setRef, |
| 32 | uset, |
| 33 | varRef, |
| 34 | leafChar, |
| 35 | lookAhead, |
| 36 | tag, |
| 37 | endMark, |
| 38 | opStart, |
| 39 | opCat, |
| 40 | opOr, |
| 41 | opStar, |
| 42 | opPlus, |
| 43 | opQuestion, |
| 44 | opBreak, |
| 45 | opReverse, |
| 46 | opLParen |
| 47 | }; |
| 48 | |
| 49 | enum OpPrecedence { |
| 50 | precZero, |
| 51 | precStart, |
| 52 | precLParen, |
| 53 | precOpOr, |
| 54 | precOpCat |
| 55 | }; |
| 56 | |
| 57 | NodeType fType; |
| 58 | RBBINode *fParent; |
| 59 | RBBINode *fLeftChild; |
| 60 | RBBINode *fRightChild; |
| 61 | UnicodeSet *fInputSet; // For uset nodes only. |
| 62 | OpPrecedence fPrecedence; // For binary ops only. |
| 63 | |
| 64 | UnicodeString fText; // Text corresponding to this node. |
| 65 | // May be lazily evaluated when (if) needed |
| 66 | // for some node types. |
| 67 | int fFirstPos; // Position in the rule source string of the |
| 68 | // first text associated with the node. |
| 69 | // If there's a left child, this will be the same |
| 70 | // as that child's left pos. |
| 71 | int fLastPos; // Last position in the rule source string |
| 72 | // of any text associated with this node. |
| 73 | // If there's a right child, this will be the same |
| 74 | // as that child's last postion. |
| 75 | |
| 76 | UBool fNullable; // See Aho. |
| 77 | int32_t fVal; // For leafChar nodes, the value. |
| 78 | // Values are the character category, |
| 79 | // corresponds to columns in the final |
| 80 | // state transition table. |
| 81 | |
Victor Chang | ce4bf3c | 2021-01-19 16:34:24 +0000 | [diff] [blame] | 82 | UBool fLookAheadEnd; // For endMark nodes, set true if |
Victor Chang | 7322950 | 2020-09-17 13:39:19 +0100 | [diff] [blame] | 83 | // marking the end of a look-ahead rule. |
| 84 | |
| 85 | UBool fRuleRoot; // True if this node is the root of a rule. |
| 86 | UBool fChainIn; // True if chaining into this rule is allowed |
| 87 | // (no '^' present). |
| 88 | |
| 89 | UVector *fFirstPosSet; |
| 90 | UVector *fLastPosSet; // TODO: rename fFirstPos & fLastPos to avoid confusion. |
| 91 | UVector *fFollowPos; |
| 92 | |
| 93 | |
| 94 | RBBINode(NodeType t); |
| 95 | RBBINode(const RBBINode &other); |
| 96 | ~RBBINode(); |
| 97 | |
| 98 | RBBINode *cloneTree(); |
| 99 | RBBINode *flattenVariables(); |
| 100 | void flattenSets(); |
| 101 | void findNodes(UVector *dest, RBBINode::NodeType kind, UErrorCode &status); |
| 102 | |
| 103 | #ifdef RBBI_DEBUG |
| 104 | static void printNodeHeader(); |
| 105 | static void printNode(const RBBINode *n); |
| 106 | static void printTree(const RBBINode *n, UBool withHeading); |
| 107 | #endif |
| 108 | |
| 109 | private: |
| 110 | RBBINode &operator = (const RBBINode &other); // No defs. |
| 111 | UBool operator == (const RBBINode &other); // Private, so these functions won't accidently be used. |
| 112 | |
| 113 | #ifdef RBBI_DEBUG |
| 114 | public: |
| 115 | int fSerialNum; // Debugging aids. |
| 116 | #endif |
| 117 | }; |
| 118 | |
| 119 | #ifdef RBBI_DEBUG |
| 120 | U_CFUNC void |
| 121 | RBBI_DEBUG_printUnicodeString(const UnicodeString &s, int minWidth=0); |
| 122 | #endif |
| 123 | |
| 124 | U_NAMESPACE_END |
| 125 | |
| 126 | #endif |
| 127 | |