path: root/addressbook/ename/e-address-western.c

/* --------------------------------------------------

 An address parser, yielding fields as per RFC 2426.

 Author:
   Jesse Pavel (jpavel@helixcode.com)

 Copyright 2000, Helix Code, Inc.
   -------------------------------------------------- 
*/

#include <ctype.h>
#include <string.h>
#include <glib.h>

#ifdef E_ADDRESS_WESTERN_TEST 

#include "e-address-western.h"

#else

#include <ename/e-address-western.h>

#endif

static gboolean
e_address_western_is_line_blank (gchar *line)
{
    gboolean blank = TRUE;
    gint cntr;

    /* A blank line consists of whitespace only, or a NULL line. */
    for (cntr = 0; line[cntr] != '\0'; cntr++ ) {
        if (!isspace(line[cntr])) {
            blank = FALSE;
            break;
        }
    }

    return blank;
}



/* In the array of lines, `lines', we will erase the line at line_num, and
 shift the remaining lines, up to line number num_lines, up one position. */

void
e_address_western_shift_line (gchar *lines[], gint line_num, gint num_lines)
{
    gint cntr;

    if (line_num >= (num_lines - 1)) {
        /* It is the last line, so simply shift in a NULL. */
        lines[line_num] = NULL;
    }
    else {
        for (cntr = line_num; cntr < num_lines; cntr++)
            lines[cntr] = lines[cntr + 1];
    }
}


static void 
e_address_western_remove_blank_lines (gchar *lines[], gint *linecntr)
{
    gint cntr;

    for (cntr = 0; cntr < *linecntr; cntr++) {
        if (e_address_western_is_line_blank (lines[cntr])) {
            /* Delete the blank line, and shift all subsequent lines up
               one spot to fill its old spot. */
            e_address_western_shift_line (lines, cntr, *linecntr);

            /* Since we must check the newly shifted line, let's 
              not advance the counter on this next pass. */
            cntr--;

            /* There is now one less line, total. */
            *linecntr -= 1;
        }
    }
}
 

gboolean
e_address_western_is_po_box (gchar *line)
{
    gboolean retval;

    /* In which phase of processing are we? */
    enum State { FIRSTCHAR, SECONDCHAR, WHITESPACE } state;
    
    
    /* If the first two letters of the line are `p' and `o', and these
     are in turn followed by whitespace before another letter, then I
     will deem the line a representation of a PO Box address. */
    
    gint cntr;

    state = FIRSTCHAR;
    for (cntr = 0; line[cntr] != '\0'; cntr++) {
        if (state == FIRSTCHAR) {
            if (isalnum(line[cntr])) {
                if (tolower(line[cntr]) == 'p')
                    state = SECONDCHAR;
                else {
                    retval = FALSE;
                    break;
                }
            }
        }
        else if (state == SECONDCHAR) {
            if (isalnum (line[cntr])) {
                if (tolower(line[cntr]) == 'o')
                    state = WHITESPACE;
                else {
                    retval = FALSE;
                    break;
                }
            }
        }
        else if (state == WHITESPACE) {
            if (isspace (line[cntr])) {
                retval = TRUE;
                break;
            }
            else if (isalnum (line[cntr])) {
                retval = FALSE;
                break;
            }
        }
    }

    return retval;
}

/* A line that contains a comma followed eventually by a number is
  deemed to be the line in the form of <town, region postal-code>. */

gboolean
e_address_western_is_postal (gchar *line)
{
    gboolean retval;
    int cntr;
    
    if (strchr (line, ',') == NULL)
        retval = FALSE;  /* No comma. */
    else {
        int index;
        
        /* Ensure that the first character after the comma is
         a letter. */
        index = strcspn (line, ",");
        index++;
        while (isspace(line[index]))
            index++;
        
        if (!isalpha(line[index]))
            return FALSE;   /* FIXME: ugly control flow. */

        cntr = strlen(line) - 1;

        /* Go to the character immediately following the last
          whitespace character. */
        while (cntr >= 0 && isspace(line[cntr]))
            cntr--; 
        
        while (cntr >= 0 && !isspace(line[cntr]))
            cntr--;

        if (cntr == 0)
            retval = FALSE;
        else {
            if (isdigit (line[cntr+1]))
                retval = TRUE;
            else
                retval = FALSE;
        }
    }   

    return retval;
}

gchar *
e_address_western_extract_po_box (gchar *line)
{
    return g_strdup (line);
}

gchar *
e_address_western_extract_locality (gchar *line)
{
    gint index;

    /* Everything before the comma is the locality. */
    index = strcspn(line, ",");

    if (index == 0)
        return NULL;
    else
        return g_strndup (line, index);
}


/* Whatever resides between the comma and the start of the
  postal code is deemed to be the region. */

gchar *
e_address_western_extract_region (gchar *line)
{
    gint start, end;

    start = strcspn (line, ",");
    start++;
    while (isspace(line[start]))
        start++;
    
    end = strlen(line) - 1;
    while (isspace (line[end]))
        end--;

    while (!isspace (line[end]))
        end--;

    while (isspace (line[end]))
        end--;
    end++;

    /* Between start and end lie the string. */
    return g_strndup ( (line+start), end-start);
}

gchar *
e_address_western_extract_postal_code (gchar *line)
{
    int start, end;

    end = strlen (line) - 1;
    while (isspace(line[end]))
        end--;
    
    start = end;
    end++;

    while (!isspace(line[start]))
        start--;
    start++;    

    /* Between start and end lie the string. */
    return g_strndup ( (line+start), end-start);
}

EAddressWestern *
e_address_western_parse (const gchar *in_address)
{
    gchar **lines;
    gint linecntr, lineindex;
    gchar *address;
    gint cntr;
    gboolean found_po_box, found_postal;

    EAddressWestern *eaw;
    gint start, end;  /* To be used to classify address lines. */

    if (in_address == NULL)
        return NULL;
    
    eaw = (EAddressWestern *)g_malloc (sizeof(EAddressWestern));
    eaw->po_box = NULL;
    eaw->extended = NULL;
    eaw->street = NULL;
    eaw->locality = NULL;
    eaw->region = NULL;
    eaw->postal_code = NULL;
    eaw->country = NULL;
    
    address = g_strdup (in_address);

    /* The first thing I'll do is divide the multiline input string
    into lines. */

    /* ... count the lines. */
    linecntr = 1;
    lineindex = 0;
    while (address[lineindex] != '\0') {
        if (address[lineindex] == '\n')
            linecntr++;
            
        lineindex++;
    }

    /* ... tally them. */
    lines = (gchar **)g_malloc (sizeof(gchar *) * (linecntr+3));
    lineindex = 0;
    lines[0] = &address[0];
    linecntr = 1;
    while (address[lineindex] != '\0') {
        if (address[lineindex] == '\n') {
            lines[linecntr] = &address[lineindex + 1];
            linecntr++;
        }

        lineindex++;
    }

    /* Convert the newlines at the end of each line (except the last,
     because it is already NULL terminated) to NULLs. */
    for (cntr = 0; cntr < (linecntr - 1); cntr++) {
        *(strchr (lines[cntr], '\n')) = '\0';
    }

    e_address_western_remove_blank_lines (lines, &linecntr);

    /* Let's just test these functions. */
    found_po_box = FALSE;
    found_postal = FALSE;

    for (cntr = 0; cntr < linecntr; cntr++)  {
        if (e_address_western_is_po_box (lines[cntr])) {
            eaw->po_box = e_address_western_extract_po_box (lines[cntr]);
            found_po_box = TRUE;
        }
        else if (e_address_western_is_postal (lines[cntr])) {
            eaw->locality = e_address_western_extract_locality (lines[cntr]);
            eaw->region = e_address_western_extract_region (lines[cntr]);
            eaw->postal_code = e_address_western_extract_postal_code (lines[cntr]);
            found_postal = TRUE;
        }
        else {
            if (found_postal) {
                if (eaw->country == NULL)
                    eaw->country = g_strdup (lines[cntr]);
                else {
                    gchar *temp;
                    temp = g_strconcat (eaw->country, "\n", lines[cntr]);
                    g_free (eaw->country);
                    eaw->country = temp;
                }
            }
            else {
                if (eaw->street == NULL) {
                    eaw->street = g_strdup (lines[cntr]);
                }
                else {
                    if (eaw->extended == NULL) {
                        eaw->extended = g_strdup (lines[cntr]);
                    }
                    else {
                        gchar *temp;
                        temp = g_strconcat (eaw->extended, "\n", lines[cntr]);
                        g_free (eaw->extended);
                        eaw->extended = temp;
                    }
                }
            }
        }
    }           
    
    g_free (lines);
    g_free (address);   
    
    return eaw;
}   


void 
e_address_western_free (EAddressWestern *eaw)
{
    if (eaw == NULL)
        return;
    
    if (eaw->po_box != NULL)
        g_free(eaw->po_box);
    if (eaw->extended != NULL)
        g_free(eaw->extended);
    if (eaw->street != NULL)
        g_free(eaw->street);
    if (eaw->locality != NULL)
        g_free(eaw->locality);
    if (eaw->region != NULL)
        g_free(eaw->region);
    if (eaw->postal_code != NULL)
        g_free(eaw->postal_code);
    if (eaw->country != NULL)
        g_free(eaw->country);
    
    g_free (eaw);
}