forked from tialaramex/sparql-query
/
result-parse.c
549 lines (498 loc) · 18.3 KB
/
result-parse.c
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/* sparql-query - a SPARQL client with GNU readline support
Copyright (C) 2006-8 Nick Lamb and Steve Harris for Garlik
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <string.h>
#include <locale.h>
#include <langinfo.h>
#include <glib.h>
#include <libxml/parser.h>
/* number of columns names to record widths for in 1st pass */
#define TMP_COLS 32
int sr_utf8_column_width(const char *str);
static const char *nullstr = "";
enum xmlstate {
STATE_START,
STATE_SPARQL_WANT_HEAD,
STATE_SPARQL_WANT_RESULTS,
STATE_SPARQL_WANT_BOOLEAN,
STATE_HEAD,
STATE_HEAD_ONLY,
STATE_HEAD_LINK_ONLY,
STATE_LINK,
STATE_BINDING,
STATE_BINDING_DONE,
STATE_VARIABLE,
STATE_RESULTS,
STATE_RESULTS_DONE,
STATE_RESULT,
STATE_BOOLEAN,
STATE_URI,
STATE_LITERAL,
STATE_BNODE,
STATE_DONE,
};
struct aa_chars {
char *H;
char *V;
char *TL;
char *TC;
char *TR;
char *CL;
char *CC;
char *CR;
char *BL;
char *BC;
char *BR;
};
typedef struct _xmlctxt {
enum xmlstate state;
int pass;
int col;
int cols;
int *widths;
char **names;
char **row;
int tmp_widths[TMP_COLS];
gchar *text;
struct aa_chars aa;
GSList *name_list;
int current_col;
int tsv;
} xmlctxt;
static int name_to_col(xmlctxt *ctxt, const char *name)
{
for (int i=0; i<ctxt->cols; i++) {
if (!strcmp(name, ctxt->names[i])) {
return i;
}
}
fprintf(stderr, "unknown column name ‘%s’ in results\n", name);
return 0;
}
static void xml_start_document(void *user_data)
{
xmlctxt *ctxt = (xmlctxt *) user_data;
ctxt->state = STATE_START;
}
static void xml_end_document(void *user_data)
{
xmlctxt *ctxt = (xmlctxt *) user_data;
if (ctxt->state != STATE_DONE) {
fprintf(stderr, "SPARQL results end abruptly\n");
}
}
static void xml_start_element(void *user_data, const xmlChar *xml_name, const xmlChar **attrs)
{
const char *name = (const char *) xml_name;
xmlctxt *ctxt = (xmlctxt *) user_data;
switch (ctxt->state) {
case STATE_START:
if (strcmp(name, "sparql")) {
fprintf(stderr, "results not in valid SPARQL results format (missing sparql)\n");
/* stop parsing */
} else {
ctxt->state = STATE_SPARQL_WANT_HEAD;
}
break;
case STATE_SPARQL_WANT_HEAD:
if (!strcmp(name, "head")) {
if (ctxt->pass == 0) {
/* do nothing */
} else {
if (!ctxt->tsv) {
for (int i=0; i<MAX(ctxt->cols, 1); i++) {
if (i == 0) {
printf("%s%s%s", ctxt->aa.TL, ctxt->aa.H, ctxt->aa.H);
} else {
printf("%s%s%s", ctxt->aa.TC, ctxt->aa.H, ctxt->aa.H);
}
for (int j=0; j<ctxt->widths[i]; j++) {
printf("%s", ctxt->aa.H);
}
}
printf("%s\n", ctxt->aa.TR);
}
}
ctxt->state = STATE_HEAD;
ctxt->col = 0;
} else {
fprintf(stderr, "results not in valid SPARQL results format (missing head)\n");
/* stop parsing */
}
break;
case STATE_HEAD:
if (!strcmp(name, "variable")) {
ctxt->state = STATE_VARIABLE;
while (attrs && *attrs) {
const char *key = (const char *) *(attrs++);
const char *value = (const char *) *(attrs++);
if (ctxt->pass == 0) {
if (ctxt->cols < TMP_COLS) {
ctxt->tmp_widths[ctxt->cols] = g_utf8_strlen(value, -1) + 1;
}
ctxt->name_list = g_slist_append(ctxt->name_list, g_strdup(value));
(ctxt->cols)++;
} else {
if (!strcmp(key, "name")) {
if (ctxt->tsv) {
printf("%s?%s", ctxt->col>0 ? ctxt->aa.V : "", value);
} else {
printf("%s ?%*s ", ctxt->aa.V, -ctxt->widths[ctxt->col] + 1, value);
}
(ctxt->col)++;
}
}
}
break;
}
/* fall through */
case STATE_HEAD_LINK_ONLY:
if (!strcmp(name, "link")) {
ctxt->state = STATE_LINK;
/* handle link */
} else {
fprintf(stderr, "results not in valid SPARQL results format (wrong element in head)\n");
/* stop parsing */
}
break;
case STATE_SPARQL_WANT_RESULTS:
if (!strcmp(name, "results")) {
if (ctxt->pass == 0) {
/* do nothing */
} else {
for (int i=0; i<ctxt->cols; i++) {
if (i == 0) {
printf("%s%s%s", ctxt->aa.CL, ctxt->aa.H, ctxt->aa.H);
} else {
printf("%s%s%s", ctxt->aa.CC, ctxt->aa.H, ctxt->aa.H);
}
for (int j=0; j<ctxt->widths[i]; j++) {
printf("%s", ctxt->aa.H);
}
}
printf("%s\n", ctxt->aa.CR);
}
ctxt->state = STATE_RESULTS;
} else if (!strcmp(name, "boolean")) {
ctxt->state = STATE_BOOLEAN;
} else {
fprintf(stderr, "results not in valid SPARQL results format (missing results)\n");
/* stop parsing */
}
break;
case STATE_RESULTS:
if (!strcmp(name, "result")) {
ctxt->state = STATE_RESULT;
ctxt->col = 0;
} else {
fprintf(stderr, "results not in valid SPARQL results format (missing result)\n");
/* stop parsing */
}
break;
case STATE_RESULT:
if (!strcmp(name, "binding")) {
while (attrs && *attrs) {
const char *key = (const char *) *(attrs++);
const char *value = (const char *) *(attrs++);
ctxt->current_col = -1;
if (!strcmp(key, "name")) {
ctxt->current_col = name_to_col(ctxt, value);
}
if (ctxt->current_col == -1) {
fprintf(stderr, "no column name found in results\n");
ctxt->current_col = 0;
}
}
ctxt->state = STATE_BINDING;
} else {
fprintf(stderr, "results not in valid SPARQL results format (missing binding)\n");
/* stop parsing */
}
break;
case STATE_BINDING:
if (!strcmp(name, "uri")) {
ctxt->state = STATE_URI;
} else if (!strcmp(name, "bnode")) {
ctxt->state = STATE_BNODE;
} else if (!strcmp(name, "literal")) {
/* FIXME we don't worry about lang tags and type URIs here yet */
ctxt->state = STATE_LITERAL;
} else {
fprintf(stderr, "results not in valid SPARQL results format (wrong element in binding)\n");
/* stop parsing */
}
break;
default:
fprintf(stderr, "results not in valid SPARQL results format, unexpected <%s>\n", name);
/* stop parsing */
}
g_free(ctxt->text);
ctxt->text = NULL;
}
static void xml_end_element(void *user_data, const xmlChar *xml_name)
{
const char *name = (const char *) xml_name;
xmlctxt *ctxt = (xmlctxt *) user_data;
switch (ctxt->state) {
case STATE_HEAD:
if (!strcmp(name, "head")) {
if (ctxt->pass == 0) {
ctxt->widths = g_new0(int, MAX(ctxt->cols, 1));
ctxt->names = g_new0(char *, MAX(ctxt->cols, 1));
ctxt->row = g_new0(char *, MAX(ctxt->cols, 1));
GSList *nlist = ctxt->name_list;
for (int k = 0; k < ctxt->cols; ++k) {
if (!nlist) {
fprintf(stderr, "name list error\n");
exit(1);
}
ctxt->names[k] = nlist->data;
nlist = nlist->next;
ctxt->row[k] = (char *)nullstr;
if (ctxt->tsv) {
ctxt->widths[k] = 0;
} else if (k < TMP_COLS) {
ctxt->widths[k] = ctxt->tmp_widths[k];
} else {
ctxt->widths[k] = 2;
}
}
} else {
if (ctxt->cols > 0 && !ctxt->tsv) {
printf("%s\n", ctxt->aa.V);
}
}
ctxt->state = STATE_SPARQL_WANT_RESULTS;
}
break;
case STATE_VARIABLE:
ctxt->state = STATE_HEAD;
break;
case STATE_BOOLEAN:
if (ctxt->pass == 0) {
ctxt->widths[ctxt->col] = MAX(sr_utf8_column_width(ctxt->text), ctxt->widths[ctxt->col]);
ctxt->state = STATE_RESULTS_DONE;
} else {
printf("%s%s%*s%s%s\n", ctxt->aa.V, ctxt->tsv ? "" : " ", -ctxt->widths[ctxt->col], ctxt->text, ctxt->tsv ? "" : " ", ctxt->aa.V);
printf("%s", ctxt->aa.BL);
for (int i=0; !ctxt->tsv && i<ctxt->widths[ctxt->col] + ctxt->tsv ? 0 : 2; i++) {
printf("%s", ctxt->aa.H);
}
printf("%s\n", ctxt->aa.BR);
/* by now ctxt->text should be 'true' or 'false' */
/* expect sparql close next */
ctxt->state = STATE_RESULTS_DONE;
}
break;
case STATE_URI:
if (!strcmp(name, "uri")) {
if (ctxt->pass == 0) {
if (ctxt->widths) {
ctxt->widths[ctxt->current_col] = MAX(sr_utf8_column_width(ctxt->text) + 2, ctxt->widths[ctxt->current_col]);
}
} else {
ctxt->row[ctxt->current_col] = g_strdup_printf("<%s>", ctxt->text);
}
ctxt->state = STATE_BINDING_DONE;
} else {
fprintf(stderr, "results not in valid SPARQL results format, unexpected </%s> after URI\n", name);
}
break;
case STATE_LITERAL:
if (!strcmp(name, "literal")) {
if (ctxt->pass == 0) {
ctxt->widths[ctxt->current_col] = MAX(sr_utf8_column_width(ctxt->text), ctxt->widths[ctxt->current_col]);
} else {
ctxt->row[ctxt->current_col] = g_strdup_printf("%s", ctxt->text ? ctxt->text : "");
}
ctxt->state = STATE_BINDING_DONE;
} else {
fprintf(stderr, "results not in valid SPARQL results format, unexpected </%s> after literal\n", name);
}
break;
case STATE_BNODE:
if (!strcmp(name, "bnode")) {
if (ctxt->pass == 0) {
ctxt->widths[ctxt->current_col] = MAX(sr_utf8_column_width(ctxt->text) + 2, ctxt->widths[ctxt->current_col]);
} else {
ctxt->row[ctxt->current_col] = g_strdup_printf("_:%s", ctxt->text ? ctxt->text : "");
}
ctxt->state = STATE_BINDING_DONE;
} else {
fprintf(stderr, "results not in valid SPARQL results format, unexpected </%s> after bnode\n", name);
}
break;
case STATE_BINDING_DONE:
if (!strcmp(name, "binding")) {
ctxt->state = STATE_RESULT;
} else {
fprintf(stderr, "results not in valid SPARQL results format, unexpected </%s> after binding\n", name);
}
break;
case STATE_RESULT:
if (!strcmp(name, "result")) {
if (ctxt->pass == 0) {
/* do nothing */
} else {
/* print the reuslt row */
for (int i=0; i<ctxt->cols; i++) {
if (ctxt->tsv) {
printf("%s%s", i>0 ? ctxt->aa.V : "", ctxt->row[i]);
} else {
printf("%s %s%*s ", ctxt->aa.V, ctxt->row[i], -ctxt->widths[i] + (int)sr_utf8_column_width(ctxt->row[i]), "");
}
if (ctxt->row[i] != nullstr) {
g_free(ctxt->row[i]);
ctxt->row[i] = (char *)nullstr;
}
}
printf("%s\n", ctxt->aa.V);
}
ctxt->state = STATE_RESULTS;
} else {
fprintf(stderr, "results not in valid SPARQL results format, unexpected </%s> after result\n", name);
}
break;
case STATE_RESULTS:
if (!strcmp(name, "results")) {
ctxt->state = STATE_RESULTS_DONE;
if (ctxt->pass == 0) {
/* do nothing */
} else {
if (!ctxt->tsv) {
for (int i=0; i<ctxt->cols; i++) {
if (i == 0) {
printf("%s%s%s", ctxt->aa.BL, ctxt->aa.H, ctxt->aa.H);
} else {
printf("%s%s%s", ctxt->aa.BC, ctxt->aa.H, ctxt->aa.H);
}
for (int j=0; j<ctxt->widths[i]; j++) {
printf("%s", ctxt->aa.H);
}
}
printf("%s\n", ctxt->aa.BR);
}
}
} else {
fprintf(stderr, "results not in valid SPARQL results format, unexpected </%s> after results\n", name);
}
break;
case STATE_RESULTS_DONE:
if (!strcmp(name, "sparql")) {
ctxt->state = STATE_DONE;
} else {
fprintf(stderr, "results not in valid SPARQL results format, unexpected </%s>\n", name);
}
break;
default:
fprintf(stderr, "results not in valid SPARQL results format, unexpected </%s>\n", name);
/* stop parsing */
}
}
static void xml_characters(void *user_data, const xmlChar *ch, int len)
{
const char *chars = (const char *) ch;
xmlctxt *ctxt = (xmlctxt *) user_data;
if (ctxt->text) {
char *tmp1 = ctxt->text;
char *tmp2 = g_strndup(chars, len);
ctxt->text = g_strconcat(tmp1, tmp2, NULL);
g_free(tmp1);
g_free(tmp2);
} else {
ctxt->text = g_strndup(chars, len);
}
}
static xmlSAXHandler sax = {
.startDocument = xml_start_document,
.endDocument = xml_end_document,
.startElement = xml_start_element,
.endElement = xml_end_element,
.characters = xml_characters,
};
int sr_parse(const char *filename, const char *format)
{
xmlctxt *ctxt = g_new0(xmlctxt, 1);
setlocale(LC_ALL, "");
int utf8_mode = (strcmp(nl_langinfo(CODESET), "UTF-8") == 0);
/* if we asked for TSV */
if (!strncmp(format, "text/tab-separated-values", 25) ||
!strncmp(format, "text/plain", 10)) {
ctxt->tsv = 1;
ctxt->aa.H = "";
ctxt->aa.V = " ";
ctxt->aa.TL = "";
ctxt->aa.TC = "";
ctxt->aa.TR = "";
ctxt->aa.CL = "";
ctxt->aa.CC = "";
ctxt->aa.CR = "";
ctxt->aa.BL = "";
ctxt->aa.BC = "";
ctxt->aa.BR = "";
} else if (utf8_mode) {
ctxt->aa.H = "─";
ctxt->aa.V = "│";
ctxt->aa.TL = "┌";
ctxt->aa.TC = "┬";
ctxt->aa.TR = "┐";
ctxt->aa.CL = "├";
ctxt->aa.CC = "┼";
ctxt->aa.CR = "┤";
ctxt->aa.BL = "└";
ctxt->aa.BC = "┴";
ctxt->aa.BR = "┘";
} else {
ctxt->aa.H = "-";
ctxt->aa.V = "|";
ctxt->aa.TL = ".";
ctxt->aa.TC = "-";
ctxt->aa.TR = ".";
ctxt->aa.CL = "|";
ctxt->aa.CC = "+";
ctxt->aa.CR = "|";
ctxt->aa.BL = "'";
ctxt->aa.BC = "-";
ctxt->aa.BR = "'";
}
ctxt->pass = 0;
xmlSAXUserParseFile(&sax, (void *) ctxt, filename);
ctxt->pass = 1;
xmlSAXUserParseFile(&sax, (void *) ctxt, filename);
if (ctxt->widths) {
g_free(ctxt->widths);
}
g_free(ctxt);
return 0;
}
int sr_utf8_column_width(const char *str)
{
if (!str) {
return 0;
}
gunichar *gustr = g_utf8_to_ucs4_fast(str, -1, NULL);
int width = 0;
for (gunichar *pos = gustr; *pos; pos++) {
if (g_unichar_iswide(*pos)) {
width += 2;
} else if (g_unichar_iszerowidth(*pos)) {
/* do nothing */
} else {
width++;
}
}
g_free(gustr);
return width;
}
/* vi:set expandtab sts=4 sw=4: */