source: XIOS3/trunk/extern/src_netcdf4/dcelex.c @ 2471

/* Copyright 2009, UCAR/Unidata and OPeNDAP, Inc.
   See the COPYRIGHT file for more information. */

#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>

#include "netcdf.h"

#include "nclist.h"
#include "ncbytes.h"
#include "dceconstraints.h"
#include "dceparselex.h"

/* Forward */
static void dumptoken(DCElexstate* lexstate);
static int tohex(int c);
static void ceaddyytext(DCElexstate* lex, int c);

/****************************************************/
/* Define 1 and > 1st legal characters */
static char* wordchars1 =
  "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-+_/%\\";
static char* wordcharsn =
  "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-+_/%\\";

/* Number characters */
static char* numchars1="+-0123456789";
static char* numcharsn="Ee.+-0123456789";

/**************************************************/

int
dcelex(YYSTYPE* lvalp, DCEparsestate* state)
{
    DCElexstate* lexstate = state->lexstate;
    int token;
    int c;
    int len;
    char* p=lexstate->next;
    token = 0;
    ncbytesclear(lexstate->yytext);
    ncbytesnull(lexstate->yytext);
    p=lexstate->next;
    while(token == 0 && (c=*p)) {
        if(c <= ' ' || c >= '\177') {p++; continue;}
        if(c == '"') {
            int more = 1;
            /* We have a SCAN_STRINGCONST */
            while(more && (c=*(++p))) {
                switch (c) {
                case '"': p++; more=0; break;
                case '\\':
                    c=*(++p);
                    switch (c) {
                    case 'r': c = '\r'; break;
                    case 'n': c = '\n'; break;
                    case 'f': c = '\f'; break;
                    case 't': c = '\t'; break;
                    case 'x': {
                        int d1,d2;
                        c = '?';
                        ++p;
                        d1 = tohex(*p++);
                        if(d1 < 0) {
                            dceerror(state,"Illegal \\xDD in SCAN_STRING");
                        } else {
                            d2 = tohex(*p++);
                            if(d2 < 0) {
                                dceerror(state,"Illegal \\xDD in SCAN_STRING");
                            } else {
                                c=(((unsigned int)d1)<<4) | (unsigned int)d2;
                            }
                        }
                    } break;
                    default: break;
                    }
                    break;
                default: break;
                }
                ceaddyytext(lexstate,c);
            }
            token=SCAN_STRINGCONST;
        } else if(strchr(numchars1,c) != NULL) {
            /* we might have a SCAN_NUMBERCONST */
            int isnumber = 0;
            char* yytext;
            char* endpoint;
            ceaddyytext(lexstate,c);
            for(p++;(c=*p);p++) {
                if(strchr(numcharsn,c) == NULL) break;
                ceaddyytext(lexstate,c);
            }
            /* See if this is a number */
            ncbytesnull(lexstate->yytext);
            yytext = ncbytescontents(lexstate->yytext);
            (void)strtoll(yytext,&endpoint,10);
            if(*yytext != '\0' && *endpoint == '\0')
                isnumber = 1;
            else {
                (void)strtod(yytext,&endpoint);
                if(*yytext != '\0' && *endpoint == '\0')
                    isnumber = 1; /* maybe */
            }
            /* A number followed by an id char is assumed to just be
               a funny id */           
            if(isnumber && (*p == '\0' || strchr(wordcharsn,*p) == NULL))  {
                token = SCAN_NUMBERCONST;
            } else {
                /* Now, if the funny word has a "." in it,
                   we have to back up to that dot */
                char* dotpoint = strchr(yytext,'.');
                if(dotpoint != NULL) {
                    p = dotpoint;
                    *dotpoint = '\0';
                }
                token = SCAN_WORD;
            }
        } else if(strchr(wordchars1,c) != NULL) {
            /* we have a SCAN_WORD */
            ceaddyytext(lexstate,c);
            for(p++;(c=*p);p++) {
                if(strchr(wordcharsn,c) == NULL) break;
                ceaddyytext(lexstate,c);
            }
            token=SCAN_WORD;
        } else {
            /* we have a single char token */
            token = c;
            ceaddyytext(lexstate,c);
            p++;
        }
    }
    lexstate->next = p;
    len = ncbyteslength(lexstate->yytext);
    if(len > MAX_TOKEN_LENGTH) len = MAX_TOKEN_LENGTH;
    strncpy(lexstate->lasttokentext,ncbytescontents(lexstate->yytext),len);
    lexstate->lasttokentext[len] = '\0';
    lexstate->lasttoken = token;
    if(dcedebug) dumptoken(lexstate);

    /*Put return value onto Bison stack*/

    if(ncbyteslength(lexstate->yytext) == 0)
        *lvalp = NULL;
    else {
        *lvalp = ncbytesdup(lexstate->yytext);
        nclistpush(lexstate->reclaim,(ncelem)*lvalp);
    }

    return token;
}

static void
ceaddyytext(DCElexstate* lex, int c)
{
    ncbytesappend(lex->yytext,(char)c);
}

static int
tohex(int c)
{
    if(c >= 'a' && c <= 'f') return (c - 'a') + 0xa;
    if(c >= 'A' && c <= 'F') return (c - 'A') + 0xa;
    if(c >= '0' && c <= '9') return (c - '0');
    return -1;
}

static void
dumptoken(DCElexstate* lexstate)
{
    switch (lexstate->lasttoken) {
    case SCAN_STRINGCONST:
        fprintf(stderr,"TOKEN = |\"%s\"|\n",lexstate->lasttokentext);
        break;
    case SCAN_WORD:
    case SCAN_NUMBERCONST:
    default:
        fprintf(stderr,"TOKEN = |%s|\n",lexstate->lasttokentext);
        break;
    }
}

void
dcelexinit(char* input, DCElexstate** lexstatep)
{
    DCElexstate* lexstate = (DCElexstate*)malloc(sizeof(DCElexstate));
    if(lexstatep) *lexstatep = lexstate;
    if(lexstate == NULL) return;
    memset((void*)lexstate,0,sizeof(DCElexstate));
    lexstate->input = strdup(input);
    lexstate->next = lexstate->input;
    lexstate->yytext = ncbytesnew();
    lexstate->reclaim = nclistnew();
}

void
dcelexcleanup(DCElexstate** lexstatep)
{
    DCElexstate* lexstate = *lexstatep;
    if(lexstate == NULL) return;
    if(lexstate->input != NULL) free(lexstate->input);
    if(lexstate->reclaim != NULL) {
        while(nclistlength(lexstate->reclaim) > 0) {
            char* word = (char*)nclistpop(lexstate->reclaim);
            if(word) free(word);
        }
        nclistfree(lexstate->reclaim);
    }
    ncbytesfree(lexstate->yytext);
    free(lexstate);
    *lexstatep = NULL;
}