158 lines
6.9 KiB
C++
158 lines
6.9 KiB
C++
//
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// regexcmp.h
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//
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// Copyright (C) 2002, International Business Machines Corporation and others.
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// All Rights Reserved.
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//
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// This file contains declarations for the class RegexCompile and for compiled
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// regular expression data format
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//
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#ifndef RBBISCAN_H
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#define RBBISCAN_H
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#include "unicode/utypes.h"
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#include "unicode/uobject.h"
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#include "unicode/uniset.h"
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#include "unicode/parseerr.h"
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#include "uhash.h"
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#include "uvector.h"
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U_NAMESPACE_BEGIN
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static const UBool REGEX_DEBUG = TRUE;
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//--------------------------------------------------------------------------------
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//
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// class RegexCompile does the lowest level, character-at-a-time
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// scanning of a regular expression.
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//
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// The output of the scanner is a tokenized form
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// of the RE, plus prebuilt UnicodeSet objects for each
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// set of charcters that is referenced.
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//
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//--------------------------------------------------------------------------------
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static const int kStackSize = 100; // The size of the state stack for
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// pattern parsing. Corresponds roughly
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// to the depth of parentheses nesting
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// that is allowed in the rules.
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enum EParseAction {dummy01, dummy02}; // Placeholder enum for the specifier for
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// actions that are specified in the
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// rule parsing state table.
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struct RegexTableEl;
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class RegexPattern;
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class RegexCompile : public UObject {
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public:
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struct RegexPatternChar {
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UChar32 fChar;
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UBool fQuoted;
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};
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RegexCompile(UErrorCode &e);
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void compile(RegexPattern &rxp, const UnicodeString &pat, UParseError &pp, UErrorCode &e);
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virtual ~RegexCompile();
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void nextChar(RegexPatternChar &c); // Get the next char from the input stream.
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UBool push(const RegexPatternChar &c); // Push (unget) one character.
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// Only a single character may be pushed.
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/**
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* ICU "poor man's RTTI", returns a UClassID for the actual class.
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*
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* @draft ICU 2.2
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*/
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virtual inline UClassID getDynamicClassID() const { return getStaticClassID(); }
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/**
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* ICU "poor man's RTTI", returns a UClassID for this class.
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*
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* @draft ICU 2.2
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*/
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static inline UClassID getStaticClassID() { return (UClassID)&fgClassID; }
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private:
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UBool doParseActions(EParseAction a);
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void error(UErrorCode e); // error reporting convenience function.
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UChar32 nextCharLL();
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UnicodeSet *scanSet();
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void handleCloseParen();
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int32_t blockTopLoc(); // Locate a position in the compiled pattern
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// at the top of the just completed block
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// or operation.
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UErrorCode *fStatus;
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RegexPattern *fRXPat;
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UParseError *fParseErr;
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int32_t fScanIndex; // Index of current character being processed
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// in the rule input string.
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int32_t fNextIndex; // Index of the next character, which
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// is the first character not yet scanned.
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UBool fQuoteMode; // Scan is in a quoted region
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UBool fFreeForm; // Scan mode is free-form, ignore spaces.
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int fLineNum; // Line number in input file.
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int fCharNum; // Char position within the line.
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UChar32 fLastChar; // Previous char, needed to count CR-LF
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// as a single line, not two.
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RegexPatternChar fC; // Current char for parse state machine
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// processing.
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int32_t fStringOpStart; // While a literal string is being scanned
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// holds the start index within RegexPattern.
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// fLiteralText where the string is being stored.
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RegexTableEl **fStateTable; // State Transition Table for regex Rule
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// parsing. index by p[state][char-class]
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uint16_t fStack[kStackSize]; // State stack, holds state pushes
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int fStackPtr; // and pops as specified in the state
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// transition rules.
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int32_t fPatternLength; // Length of the input pattern string.
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UStack fParenStack; // parentheses stack. Each frame consists of
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// the positions of compiled pattern operations
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// needing fixup, followed by negative vallue. The
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// first entry in each frame is the position of the
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// spot reserved for use when a quantifier
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// needs to add a SAVE at the start of a (block)
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// The negative value (-1, -2,...) indicates
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// the kind of paren that opened the frame. Some
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// need special handling on close.
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int32_t fMatchOpenParen; // The position in the compiled pattern
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// of the slot reserved for a state save
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// at the start of the most recently processed
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// parenthesized block.
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int32_t fMatchCloseParen; // The position in the pattern of the first
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// location after the most recently processed
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// parenthesized block.
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/**
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* The address of this static class variable serves as this class's ID
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* for ICU "poor man's RTTI".
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*/
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static const char fgClassID;
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};
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U_NAMESPACE_END
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#endif
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