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/*

 * Copyright (c) 2002-2005 The TenDRA Project <http://www.tendra.org/>.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 * 3. Neither the name of The TenDRA Project nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific, prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS

 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * $Id$

 */

/*

    		 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 "char.h"

#include "error.h"

#include "lex.h"

#include "output.h"

/*

    OUTPUT FILE

    This variable gives the main output file.  out is used within this file

    as a shorthand for lex_output.

*/

FILE *lex_output;

#define out lex_output

/*

    OUTPUT INDENTATION

    This routine outputs an indentation of d.

*/

static void

output_indent(int d)

{

    int n = 4 * d;

    for (; n >= 8; n -= 8)fputc_v('\t', out);

    for (; n; n--)fputc_v(' ', out);

    return;

}

/*

    FIND A CHARACTER LITERAL

    This routine finds the character literal corresponding to c.

*/

static char *

char_lit(letter c)

{

    static char buff [10];

    switch (c) {

	case '\n': return("'\\n'");

	case '\t': return("'\\t'");

	case '\v': return("'\\v'");

	case '\f': return("'\\f'");

	case '\\': return("'\\\\'");

	case '\'': return("'\\''");

    }

    if (c == EOF_LETTER) return("LEX_EOF");

    if (c > 127) return("'?'");

    sprintf_v(buff, "'%c'",(char)c);

    return(buff);

}

/*

    OUTPUT OPTIONS

    The flag in_pre_pass is used to indicate the preliminary pass to

    output_pass.  read_name gives the name of the character reading

    function used in the output routines.

*/

static int in_pre_pass = 0;

static char *read_name = "read_char";

/*

    OUTPUT PASS INFORMATION

    This routine outputs code for the lexical pass indicated by p.  n

    gives the depth of recursion and d gives the indentation.

*/

static int

output_pass(character *p, int n, int d)

{

    character *q;

    int cases = 0;

    int classes = 0;

    char *ret = NULL;

    char *args = NULL;

    char *cond = NULL;

    /* First pass */

    for (q = p->next; q != NULL; q = q->opt) {

	letter c = q->ch;

	if (c == LAST_LETTER) {

	    ret = q->defn;

	    args = q->args;

	    cond = q->cond;

	} else if (c <= SIMPLE_LETTER) {

	    cases++;

	} else {

	    classes++;

	}

    }

    /* Deal with cases */

    if (cases || classes) {

	int w1 = (n == 0 && !in_pre_pass);

	int w2 = (n == 0 && in_pre_pass);

	output_indent(d);

	fprintf_v(out, "int c%d = %s()", n, read_name);

	if (classes || w1)fprintf_v(out, ", t%d", n);

	fputs_v(";\n", out);

	if (w1) {

	    output_indent(d);

	    fputs_v("t0 = lookup_char(c0);\n", out);

	    output_indent(d);

	    fputs_v("if (is_white(t0)) goto start;\n", out);

	}

	if (w2) {

	    output_indent(d);

	    fputs_v("restart: {\n", out);

	    d++;

	}

	if (cases > 4) {

	    /* Small number of cases */

	    output_indent(d);

	    fprintf_v(out, "switch (c%d) {\n", n);

	    for (q = p->next; q != NULL; q = q->opt) {

		letter c = q->ch;

		if (c != LAST_LETTER && c <= SIMPLE_LETTER) {

		    output_indent(d + 1);

		    fprintf_v(out, "case %s: {\n", char_lit(c));

		    if (output_pass(q, n + 1, d + 2) == 0) {

			output_indent(d + 2);

			fputs_v("break;\n", out);

		    }

		    output_indent(d + 1);

		    fputs_v("}\n", out);

		}

	    }

	    output_indent(d);

	    fputs_v("}\n", out);

	} else {

	    /* Large number of cases */

	    int started = 0;

	    for (q = p->next; q != NULL; q = q->opt) {

		letter c = q->ch;

		if (c != LAST_LETTER && c <= SIMPLE_LETTER) {

		    output_indent(d);

		    if (started)fputs_v("} else ", out);

		    fprintf_v(out, "if (c%d == %s) {\n",

				n, char_lit(c));

		    IGNORE output_pass(q, n + 1, d + 1);

		    started = 1;

		}

	    }

	    if (started) {

		output_indent(d);

		fputs_v("}\n", out);

	    }

	}

	if (classes) {

	    /* Complex cases */

	    int started = 0;

	    if (!w1) {

		output_indent(d);

		fprintf_v(out, "t%d = lookup_char(c%d);\n", n, n);

	    }

	    for (q = p->next; q != NULL; q = q->opt) {

		letter c = q->ch;

		if (c != LAST_LETTER && c > SIMPLE_LETTER) {

		    char *gnm;

		    if (c == WHITE_LETTER) {

			gnm = "white";

		    } else {

			int g = (int)(c - GROUP_LETTER);

			gnm = groups [g].name;

		    }

		    output_indent(d);

		    if (started)fputs_v("} else ", out);

		    fprintf_v(out, "if (is_%s(t%d)) {\n", gnm, n);

		    IGNORE output_pass(q, n + 1, d + 1);

		    started = 1;

		}

	    }

	    output_indent(d);

	    fputs_v("}\n", out);

	}

	if (w2) {

	    d--;

	    output_indent(d);

	    fputs_v("}\n", out);

	}

	if (n) {

	    output_indent(d);

	    fprintf_v(out, "unread_char(c%d);\n", n);

	}

    }

    /* Deal with return */

    if (ret) {

	if (in_pre_pass) {

	    int m = *ret;

	    if (m) {

		char *str;

		if (m == '\\') {

		    str = char_lit(find_escape(ret [1]));

		    m = ret [2];

		} else {

		    str = char_lit((letter)m);

		    m = ret [1];

		}

		if (m) {

		    error(ERROR_SERIOUS, "Bad mapping string, '%s'", ret);

		}

		if (cond) {

		    output_indent(d);

		    fprintf_v(out, "if (%s) {\n", cond);

		    output_indent(d + 1);

		    fprintf_v(out, "c0 = %s;\n", str);

		    output_indent(d + 1);

		    fputs_v("goto restart;\n", out);

		    output_indent(d);

		    fputs_v("}\n", out);

		} else {

		    output_indent(d);

		    fprintf_v(out, "c0 = %s;\n", str);

		    output_indent(d);

		    fputs_v("goto restart;\n", out);

		}

	    } else {

		output_indent(d);

		if (cond)fprintf_v(out, "if (%s) ", cond);

		fputs_v("goto start;\n", out);

	    }

	} else {

	    output_indent(d);

	    if (cond)fprintf_v(out, "if (%s) ", cond);

	    fprintf_v(out, "return(%s", ret);

	    if (args) {

		int i;

		fputs_v("(c0", out);

		for (i = 1; i < n; i++)fprintf_v(out, ", c%d", i);

		fputs_v(")", out);

	    }

	    fputs_v(");\n", out);

	}

    }

    return((ret && (cond == NULL))? 1 : 0);

}

/*

    OUTPUT INITIAL COMMENT

    This routine outputs a comment stating that the file is automatically

    generated.

*/

static void

output_comment(void)

{

    if (first_comment) {

	/* Print copyright comment, if present */

	fprintf_v(out, "%s\n\n", first_comment);

    }

    fputs_v ( "/*\n *  AUTOMATICALLY GENERATED", out ) ;

    fprintf_v ( out, " BY %s VERSION %s", progname, progvers ) ;

    fputs_v ( "\n */\n\n\n", out ) ;

    return;

}

/*

    MAIN OUTPUT ROUTINE

    This routine is the entry point for the main output routine.

*/

void

output_all(void)

{

    int c, n;

    /* Initial comment */

    output_comment();

    /* Character look-up table */

    fputs_v ( "/* LOOKUP TABLE */\n\n", out ) ;

    fprintf_v(out, "static unsigned %s lookup_tab[257] = {\n",

		(no_groups >= 8 ? "short" : "char"));

    for (c = 0; c <= 256; c++) {

	unsigned int m = 0;

	letter a = (c == 256 ? EOF_LETTER :(letter)c);

	if (in_group(white_space, a))m = 1;

	for (n = 0; n < no_groups; n++) {

	    if (in_group(groups [n].defn, a)) {

		m |= (unsigned int)(1 << (n + 1));

	    }

	}

	if ((c % 8) == 0)fputs_v("    ", out);

	fprintf_v(out, "0x%04x", m);

	if (c != 256) {

	    if ((c % 8) == 7) {

		fputs_v(",\n", out);

	    } else {

		fputs_v(", ", out);

	    }

	}

    }

    fputs_v("\n};\n\n", out);

    /* Macros for accessing table */

    fputs_v("#ifndef LEX_EOF\n", out);

    fputs_v("#define LEX_EOF\t\t256\n", out);

    fputs_v("#endif\n\n", out);

    fputs_v("#define lookup_char(C)\t", out);

    fputs_v("((int)lookup_tab[(C)])\n", out);

    fputs_v("#define is_white(T)\t((T) & 0x0001)\n", out);

    for (n = 0; n < no_groups; n++) {

	char *gnm = groups [n].name;

	unsigned int m = (unsigned int)(1 << (n + 1));

	fprintf_v(out, "#define is_%s(T)\t", gnm);

	/*if ((int)strlen(gnm) < 8)fputc_v('\t', out);*/

	fprintf_v(out, "((T) & 0x%04x)\n", m);

    }

    fputs_v("\n\n", out);

    /* Lexical pre-pass */

    if (pre_pass->next) {

	in_pre_pass = 1;

	fputs_v ( "/* PRE-PASS ANALYSER */\n\n", out ) ;

	fputs_v("static int read_char_aux(void)\n", out);

	fputs_v("{\n", out);

	fputs_v("    start: {\n", out);

	IGNORE output_pass(pre_pass, 0, 2);

	fputs_v("\treturn(c0);\n", out);

	fputs_v("    }\n", out);

	fputs_v("}\n\n\n", out);

	read_name = "read_char_aux";

    }

    /* Main pass */

    in_pre_pass = 0;

    fputs_v ( "/* MAIN PASS ANALYSER */\n\n", out ) ;

    fputs_v("int\nread_token(void)\n", out);

    fputs_v("{\n", out);

    fputs_v("    start: {\n", out);

    IGNORE output_pass(main_pass, 0, 2);

    fputs_v("\treturn(unknown_token(c0));\n", out);

    fputs_v("    }\n", out);

    fputs_v("}\n", out);

    return;

}

/*

    OUTPUT CODE FOR A SINGLE KEYWORD

    This routine outputs code for the keyword p.

*/

static void

output_word(keyword *p)

{

    fprintf_v(out, "MAKE_KEYWORD(\"%s\", %s", p->name, p->defn);

    if (p->args)fputs_v("()", out);

    fputs_v(");\n", out);

    p->done = 1;

    return;

}

/*

    KEYWORD OUTPUT ROUTINE

    This routine outputs code to generate all keywords.

*/

void

output_keyword(void)

{

    keyword *p, *q;

    output_comment();

    fputs_v ( "/* KEYWORDS */\n\n", out ) ;

    for (p = keywords; p != NULL; p = p->next) {

	if (p->done == 0) {

	    char *cond = p->cond;

	    if (cond) {

		fprintf_v(out, "if (%s) {\n    ", cond);

		output_word(p);

		for (q = p->next; q != NULL; q = q->next) {

		    if (q->cond && streq(q->cond, cond)) {

			fputs_v("    ", out);

			output_word(q);

		    }

		}

		fputs_v("}\n", out);

	    } else {

		output_word(p);

		for (q = p->next; q != NULL; q = q->next) {

		    if (q->cond == NULL)output_word(q);

		}

	    }

	}

    }

    return;

}