221 lines
6.1 KiB
C++
221 lines
6.1 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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*******************************************************************************
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* Copyright (C) 2011, International Business Machines
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* Corporation and others. All Rights Reserved.
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*******************************************************************************
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* file name: patternprops.cpp
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* encoding: UTF-8
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2011mar13
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* created by: Markus W. Scherer
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*/
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#include "unicode/utypes.h"
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#include "patternprops.h"
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U_NAMESPACE_BEGIN
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/*
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* One byte per Latin-1 character.
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* Bit 0 is set if either Pattern property is true,
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* bit 1 if Pattern_Syntax is true,
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* bit 2 if Pattern_White_Space is true.
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* That is, Pattern_Syntax is encoded as 3 and Pattern_White_Space as 5.
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*/
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static const uint8_t latin1[256]={
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// WS: 9..D
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0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 5, 5, 5, 5, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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// WS: 20 Syntax: 21..2F
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5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
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// Syntax: 3A..40
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 3, 3,
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3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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// Syntax: 5B..5E
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 0,
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// Syntax: 60
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3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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// Syntax: 7B..7E
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 0,
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// WS: 85
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0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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// Syntax: A1..A7, A9, AB, AC, AE
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0, 3, 3, 3, 3, 3, 3, 3, 0, 3, 0, 3, 3, 0, 3, 0,
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// Syntax: B0, B1, B6, BB, BF
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3, 3, 0, 0, 0, 0, 3, 0, 0, 0, 0, 3, 0, 0, 0, 3,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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// Syntax: D7
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0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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// Syntax: F7
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0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0
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};
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/*
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* One byte per 32 characters from U+2000..U+303F indexing into
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* a small table of 32-bit data words.
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* The first two data words are all-zeros and all-ones.
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*/
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static const uint8_t index2000[130]={
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2, 3, 4, 0, 0, 0, 0, 0, // 20xx
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0, 0, 0, 0, 5, 1, 1, 1, // 21xx
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1, 1, 1, 1, 1, 1, 1, 1, // 22xx
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1, 1, 1, 1, 1, 1, 1, 1, // 23xx
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1, 1, 1, 0, 0, 0, 0, 0, // 24xx
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1, 1, 1, 1, 1, 1, 1, 1, // 25xx
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1, 1, 1, 1, 1, 1, 1, 1, // 26xx
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1, 1, 1, 6, 7, 1, 1, 1, // 27xx
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1, 1, 1, 1, 1, 1, 1, 1, // 28xx
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1, 1, 1, 1, 1, 1, 1, 1, // 29xx
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1, 1, 1, 1, 1, 1, 1, 1, // 2Axx
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1, 1, 1, 1, 1, 1, 1, 1, // 2Bxx
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0, 0, 0, 0, 0, 0, 0, 0, // 2Cxx
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0, 0, 0, 0, 0, 0, 0, 0, // 2Dxx
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1, 1, 1, 1, 0, 0, 0, 0, // 2Exx
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0, 0, 0, 0, 0, 0, 0, 0, // 2Fxx
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8, 9 // 3000..303F
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};
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/*
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* One 32-bit integer per 32 characters. Ranges of all-false and all-true
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* are mapped to the first two values, other ranges map to appropriate bit patterns.
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*/
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static const uint32_t syntax2000[]={
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0,
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0xffffffff,
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0xffff0000, // 2: 2010..201F
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0x7fff00ff, // 3: 2020..2027, 2030..203E
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0x7feffffe, // 4: 2041..2053, 2055..205E
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0xffff0000, // 5: 2190..219F
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0x003fffff, // 6: 2760..2775
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0xfff00000, // 7: 2794..279F
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0xffffff0e, // 8: 3001..3003, 3008..301F
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0x00010001 // 9: 3020, 3030
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};
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/*
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* Same as syntax2000, but with additional bits set for the
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* Pattern_White_Space characters 200E 200F 2028 2029.
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*/
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static const uint32_t syntaxOrWhiteSpace2000[]={
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0,
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0xffffffff,
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0xffffc000, // 2: 200E..201F
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0x7fff03ff, // 3: 2020..2029, 2030..203E
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0x7feffffe, // 4: 2041..2053, 2055..205E
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0xffff0000, // 5: 2190..219F
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0x003fffff, // 6: 2760..2775
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0xfff00000, // 7: 2794..279F
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0xffffff0e, // 8: 3001..3003, 3008..301F
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0x00010001 // 9: 3020, 3030
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};
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UBool
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PatternProps::isSyntax(UChar32 c) {
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if(c<0) {
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return FALSE;
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} else if(c<=0xff) {
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return (UBool)(latin1[c]>>1)&1;
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} else if(c<0x2010) {
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return FALSE;
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} else if(c<=0x3030) {
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uint32_t bits=syntax2000[index2000[(c-0x2000)>>5]];
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return (UBool)((bits>>(c&0x1f))&1);
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} else if(0xfd3e<=c && c<=0xfe46) {
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return c<=0xfd3f || 0xfe45<=c;
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} else {
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return FALSE;
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}
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}
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UBool
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PatternProps::isSyntaxOrWhiteSpace(UChar32 c) {
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if(c<0) {
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return FALSE;
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} else if(c<=0xff) {
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return (UBool)(latin1[c]&1);
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} else if(c<0x200e) {
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return FALSE;
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} else if(c<=0x3030) {
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uint32_t bits=syntaxOrWhiteSpace2000[index2000[(c-0x2000)>>5]];
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return (UBool)((bits>>(c&0x1f))&1);
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} else if(0xfd3e<=c && c<=0xfe46) {
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return c<=0xfd3f || 0xfe45<=c;
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} else {
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return FALSE;
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}
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}
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UBool
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PatternProps::isWhiteSpace(UChar32 c) {
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if(c<0) {
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return FALSE;
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} else if(c<=0xff) {
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return (UBool)(latin1[c]>>2)&1;
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} else if(0x200e<=c && c<=0x2029) {
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return c<=0x200f || 0x2028<=c;
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} else {
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return FALSE;
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}
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}
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const UChar *
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PatternProps::skipWhiteSpace(const UChar *s, int32_t length) {
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while(length>0 && isWhiteSpace(*s)) {
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++s;
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--length;
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}
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return s;
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}
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const UChar *
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PatternProps::trimWhiteSpace(const UChar *s, int32_t &length) {
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if(length<=0 || (!isWhiteSpace(s[0]) && !isWhiteSpace(s[length-1]))) {
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return s;
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}
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int32_t start=0;
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int32_t limit=length;
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while(start<limit && isWhiteSpace(s[start])) {
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++start;
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}
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if(start<limit) {
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// There is non-white space at start; we will not move limit below that,
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// so we need not test start<limit in the loop.
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while(isWhiteSpace(s[limit-1])) {
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--limit;
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}
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}
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length=limit-start;
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return s+start;
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}
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UBool
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PatternProps::isIdentifier(const UChar *s, int32_t length) {
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if(length<=0) {
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return FALSE;
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}
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const UChar *limit=s+length;
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do {
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if(isSyntaxOrWhiteSpace(*s++)) {
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return FALSE;
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}
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} while(s<limit);
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return TRUE;
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}
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const UChar *
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PatternProps::skipIdentifier(const UChar *s, int32_t length) {
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while(length>0 && !isSyntaxOrWhiteSpace(*s)) {
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++s;
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--length;
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}
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return s;
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}
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U_NAMESPACE_END
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