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/*

    		 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

    product development provided that any such use et cetera

    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

#include "config.h"

#include <limits.h>

#include "c_types.h"

#include "char.h"

#include "literal.h"

/*

    ASCII FLAG

    This flag is true if the native codeset is ASCII.  It is initially -1

    indicating that the conversion tables have not been initialised.

*/

int is_ascii = -1 ;

/*

    CONVERSION TABLES

    These tables give the conversions of ASCII to and from the native

    codeset.  The ASCII to native table is deduced for the portable

    codeset from the list of characters in char.h which is given in

    ASCII sequence.

*/

static character to_ascii_tab [ NO_CHAR + 1 ] ;

static character from_ascii_tab [ NO_CHAR + 1 ] = {

#define NONE			char_illegal

#define CHAR_DATA( A, B, C, D )	( D ),

#include "char.h"

#undef CHAR_DATA

    NONE			/* dummy last element */

} ;

/*

    CONVERT A CHARACTER TO ASCII

    This routine converts the character c from the native codeset to

    ASCII.

*/

unsigned long to_ascii

    PROTO_N ( ( c, ch ) )

    PROTO_T ( unsigned long c X int *ch )

{

    if ( c < NO_CHAR ) {

	c = ( unsigned long ) to_ascii_tab [c] ;

	*ch = CHAR_ASCII ;

    }

    return ( c ) ;

}

/*

    CONVERT A CHARACTER TO NATIVE CODESET

    This routine converts the character c to the native codeset from

    ASCII.

*/

unsigned long from_ascii

    PROTO_N ( ( c, ch ) )

    PROTO_T ( unsigned long c X int *ch )

{

    if ( c < NO_CHAR ) {

	c = ( unsigned long ) from_ascii_tab [c] ;

	*ch = CHAR_SIMPLE ;

    }

    return ( c ) ;

}

/*

    TRANSFORM A TABLE FROM ASCII TO NATIVE CODESET

    This routine maps the look-up table p from ASCII to native codeset.

*/

void map_ascii

    PROTO_N ( ( p ) )

    PROTO_T ( unsigned char *p )

{

    unsigned c ;

    int asc = is_ascii ;

    if ( asc == -1 ) {

	/* Set up conversion tables */

	asc = 1 ;

	for ( c = 0 ; c < NO_CHAR ; c++ ) {

	    to_ascii_tab [c] = ( character ) c ;

	}

	for ( c = 0 ; c < NO_CHAR ; c++ ) {

	    unsigned a = ( unsigned ) from_ascii_tab [c] ;

	    if ( a == NONE ) a = c ;

	    if ( a != c ) asc = 0 ;

	    from_ascii_tab [c] = ( character ) a ;

	    to_ascii_tab [a] = ( character ) c ;

	}

	is_ascii = asc ;

    }

    if ( asc == 0 ) {

	/* Map table */

	unsigned char b = p [ NONE ] ;

	unsigned char copy [ NO_CHAR ] ;

	for ( c = 0 ; c < NO_CHAR ; c++ ) {

	    copy [c] = p [c] ;

	    p [c] = b ;

	}

	SET ( copy ) ;

	for ( c = 0 ; c < NO_CHAR ; c++ ) {

	    character a = from_ascii_tab [c] ;

	    p [a] = copy [c] ;

	}

    }

    return ;

}

/*

    TABLE OF ALPHABETIC UNICODE CHARACTERS

    This table gives the ranges of the unicode characters which are

    suitable for use in an identifier name in ascending order.  It is

    derived from Annex E of the standard (which derives from ISO/IEC

    PDTR 10176) with two misprints corrected.  0e0d should be 0e8d

    and 5e76 should be fe76.  Note that the upper and lower case

    English alphabets have been included even though they are not

    valid universal character names.

*/

static struct {

    unsigned long lo ;

    unsigned long hi ;

} alpha_range [] = {

    /* Latin */

    { 0x0041, 0x005a }, { 0x0061, 0x007a }, { 0x00c0, 0x00d6 },

    { 0x00d8, 0x00f6 }, { 0x00f8, 0x01f5 }, { 0x01fa, 0x0217 },

    { 0x0250, 0x02a8 },

    /* Greek */

    { 0x0384, 0x0384 }, { 0x0388, 0x038a }, { 0x038c, 0x038c },

    { 0x038e, 0x03a1 }, { 0x03a3, 0x03ce }, { 0x03d0, 0x03d6 },

    { 0x03da, 0x03da }, { 0x03dc, 0x03dc }, { 0x03de, 0x03de },

    { 0x03e0, 0x03e0 }, { 0x03e2, 0x03f3 },

    /* Cyrilic */

    { 0x0401, 0x040d }, { 0x040f, 0x044f }, { 0x0451, 0x045c },

    { 0x045e, 0x0481 }, { 0x0490, 0x04c4 }, { 0x04c7, 0x04c8 },

    { 0x04cb, 0x04cc }, { 0x04d0, 0x04eb }, { 0x04ee, 0x04f5 },

    { 0x04f8, 0x04f9 },

    /* Armenian */

    { 0x0531, 0x0556 }, { 0x0561, 0x0587 },

    /* Hebrew */

    { 0x05d0, 0x05ea }, { 0x05f0, 0x05f4 },

    /* Arabic */

    { 0x0621, 0x063a }, { 0x0640, 0x0652 }, { 0x0670, 0x06b7 },

    { 0x06ba, 0x06be }, { 0x06c0, 0x06ce }, { 0x06e5, 0x06e7 },

    /* Devanagari */

    { 0x0905, 0x0939 }, { 0x0958, 0x0962 },

    /* Bengali */

    { 0x0985, 0x098c }, { 0x098f, 0x0990 }, { 0x0993, 0x09a8 },

    { 0x09aa, 0x09b0 }, { 0x09b2, 0x09b2 }, { 0x09b6, 0x09b9 },

    { 0x09dc, 0x09dd }, { 0x09df, 0x09e1 }, { 0x09f0, 0x09f1 },

    /* Gurmukhi */

    { 0x0a05, 0x0a0a }, { 0x0a0f, 0x0a10 }, { 0x0a13, 0x0a28 },

    { 0x0a2a, 0x0a30 }, { 0x0a32, 0x0a33 }, { 0x0a35, 0x0a36 },

    { 0x0a38, 0x0a39 }, { 0x0a59, 0x0a5c }, { 0x0a5e, 0x0a5e },

    /* Gujarati */

    { 0x0a85, 0x0a8b }, { 0x0a8d, 0x0a8d }, { 0x0a8f, 0x0a91 },

    { 0x0a93, 0x0aa8 }, { 0x0aaa, 0x0ab0 }, { 0x0ab2, 0x0ab3 },

    { 0x0ab5, 0x0ab9 }, { 0x0ae0, 0x0ae0 },

    /* Oriya */

    { 0x0b05, 0x0b0c }, { 0x0b0f, 0x0b10 }, { 0x0b13, 0x0b28 },

    { 0x0b2a, 0x0b30 }, { 0x0b32, 0x0b33 }, { 0x0b36, 0x0b39 },

    { 0x0b5c, 0x0b5d }, { 0x0b5f, 0x0b61 },

    /* Tamil */

    { 0x0b85, 0x0b8a }, { 0x0b8e, 0x0b90 }, { 0x0b92, 0x0b95 },

    { 0x0b99, 0x0b9a }, { 0x0b9c, 0x0b9c }, { 0x0b9e, 0x0b9f },

    { 0x0ba3, 0x0ba4 }, { 0x0ba8, 0x0baa }, { 0x0bae, 0x0bb5 },

    { 0x0bb7, 0x0bb9 },

    /* Telugu */

    { 0x0c05, 0x0c0c }, { 0x0c0e, 0x0c10 }, { 0x0c12, 0x0c28 },

    { 0x0c2a, 0x0c33 }, { 0x0c35, 0x0c39 }, { 0x0c60, 0x0c61 },

    /* Kannada */

    { 0x0c85, 0x0c8c }, { 0x0c8e, 0x0c90 }, { 0x0c92, 0x0ca8 },

    { 0x0caa, 0x0cb3 }, { 0x0cb5, 0x0cb9 }, { 0x0ce0, 0x0ce1 },

    /* Malayalam */

    { 0x0d05, 0x0d0c }, { 0x0d0e, 0x0d10 }, { 0x0d12, 0x0d28 },

    { 0x0d2a, 0x0d39 }, { 0x0d60, 0x0d61 },

    /* Thai */

    { 0x0e01, 0x0e30 }, { 0x0e32, 0x0e33 }, { 0x0e40, 0x0e46 },

    { 0x0e4f, 0x0e5b },

    /* Lao */

    { 0x0e81, 0x0e82 }, { 0x0e84, 0x0e84 }, { 0x0e87, 0x0e87 },

    { 0x0e88, 0x0e88 }, { 0x0e8a, 0x0e8a }, { 0x0e8d, 0x0e8d },

    { 0x0e94, 0x0e97 }, { 0x0e99, 0x0e9f }, { 0x0ea1, 0x0ea3 },

    { 0x0ea5, 0x0ea5 }, { 0x0ea7, 0x0ea7 }, { 0x0eaa, 0x0eaa },

    { 0x0eab, 0x0eab }, { 0x0ead, 0x0eb0 }, { 0x0eb2, 0x0eb2 },

    { 0x0eb3, 0x0eb3 }, { 0x0ebd, 0x0ebd }, { 0x0ec0, 0x0ec4 },

    { 0x0ec6, 0x0ec6 },

    /* Georgian */

    { 0x10a0, 0x10c5 }, { 0x10d0, 0x10f6 },

    /* Hangul */

    { 0x1100, 0x1159 }, { 0x1161, 0x11a2 }, { 0x11a8, 0x11f9 },

    /* Latin (continued) */

    { 0x1e00, 0x1e9a }, { 0x1ea0, 0x1ef9 },

    /* Greek (continued) */

    { 0x1f00, 0x1f15 }, { 0x1f18, 0x1f1d }, { 0x1f20, 0x1f45 },

    { 0x1f48, 0x1f4d }, { 0x1f50, 0x1f57 }, { 0x1f59, 0x1f59 },

    { 0x1f5b, 0x1f5b }, { 0x1f5d, 0x1f5d }, { 0x1f5f, 0x1f7d },

    { 0x1f80, 0x1fb4 }, { 0x1fb6, 0x1fbc }, { 0x1fc2, 0x1fc4 },

    { 0x1fc6, 0x1fcc }, { 0x1fd0, 0x1fd3 }, { 0x1fd6, 0x1fdb },

    { 0x1fe0, 0x1fec }, { 0x1ff2, 0x1ff4 }, { 0x1ff6, 0x1ffc },

    /* Hiragana */

    { 0x3041, 0x3094 }, { 0x309b, 0x309e },

    /* Katakana */

    { 0x30a1, 0x30fe },

    /* Bopmofo */

    { 0x3105, 0x312c },

    /* CJK Unified Ideographs */

#if FS_NUMBER_SUFFIX

    { 0x4e00UL, 0x9fa5UL }, { 0xf900UL, 0xfa2dUL }, { 0xfb1fUL, 0xfb36UL },

    { 0xfb38UL, 0xfb3cUL }, { 0xfb3eUL, 0xfb3eUL }, { 0xfb40UL, 0xfb41UL },

    { 0xfb42UL, 0xfb44UL }, { 0xfb46UL, 0xfbb1UL }, { 0xfbd3UL, 0xfd3fUL },

    { 0xfd50UL, 0xfd8fUL }, { 0xfd92UL, 0xfdc7UL }, { 0xfdf0UL, 0xfdfbUL },

    { 0xfe70UL, 0xfe72UL }, { 0xfe74UL, 0xfe74UL }, { 0xfe76UL, 0xfefcUL },

    { 0xff21UL, 0xff3aUL }, { 0xff41UL, 0xff5aUL }, { 0xff66UL, 0xffbeUL },

    { 0xffc2UL, 0xffc7UL }, { 0xffcaUL, 0xffcfUL }, { 0xffd2UL, 0xffd7UL },

    { 0xffdaUL, 0xffdcUL }

#else

    { 0x4e00, 0x9fa5 }, { 0xf900, 0xfa2d }, { 0xfb1f, 0xfb36 },

    { 0xfb38, 0xfb3c }, { 0xfb3e, 0xfb3e }, { 0xfb40, 0xfb41 },

    { 0xfb42, 0xfb44 }, { 0xfb46, 0xfbb1 }, { 0xfbd3, 0xfd3f },

    { 0xfd50, 0xfd8f }, { 0xfd92, 0xfdc7 }, { 0xfdf0, 0xfdfb },

    { 0xfe70, 0xfe72 }, { 0xfe74, 0xfe74 }, { 0xfe76, 0xfefc },

    { 0xff21, 0xff3a }, { 0xff41, 0xff5a }, { 0xff66, 0xffbe },

    { 0xffc2, 0xffc7 }, { 0xffca, 0xffcf }, { 0xffd2, 0xffd7 },

    { 0xffda, 0xffdc }

#endif

} ;

/*

    DOES A UNICODE CHARACTER REPRESENT AN ALPHABETIC VALUE?

    This routine checks whether the unicode character c represents an

    alphabetic value suitable for use in an identifier name.  It

    operates by performing a binary chop on the table above.

*/

int unicode_alpha

    PROTO_N ( ( c ) )

    PROTO_T ( unsigned long c )

{

    int i = 0 ;

    int j = array_size ( alpha_range ) - 1 ;

    do {

	int k = ( i + j ) / 2 ;

	if ( c < alpha_range [k].lo ) {

	    /* Lower half */

	    j = k - 1 ;

	} else if ( c > alpha_range [k].hi ) {

	    /* Upper half */

	    i = k + 1 ;

	} else {

	    /* Match found */

	    return ( 1 ) ;

	}

    } while ( i <= j ) ;

    return ( 0 ) ;

}