/*
** Copyright (c) 2011 D. Richard Hipp
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of the Simplified BSD License (also
** known as the "2-Clause License" or "FreeBSD License".)
**
** 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.
**
** Author contact information:
** drh@hwaci.com
** http://www.hwaci.com/drh/
**
*/
#include "config.h"
#include "json_diff.h"
#if INTERFACE
#include "json_detail.h"
#endif
/*
** Append the difference between two RIDs to the output
*/
cson_value * json_generate_diff(const char *zFrom, const char *zTo,
int nContext){
int fromid;
int toid;
int outLen;
Blob from = empty_blob, to = empty_blob, out = empty_blob;
cson_value * rc = NULL;
char const * zType = "ci";
fromid = name_to_typed_rid(zFrom, "*");
if(fromid<=0){
json_set_err(FSL_JSON_E_UNRESOLVED_UUID,
"Could not resolve 'from' ID.");
return NULL;
}
toid = name_to_typed_rid(zTo, "*");
if(toid<=0){
json_set_err(FSL_JSON_E_UNRESOLVED_UUID,
"Could not resolve 'from' ID.");
return NULL;
}
content_get(fromid, &from);
content_get(toid, &to);
blob_zero(&out);
text_diff(&from, &to, &out, nContext, 1);
blob_reset(&from);
blob_reset(&to);
outLen = blob_size(&out);
if(outLen>0){
rc = cson_value_new_string(blob_buffer(&out), blob_size(&out));
}
blob_reset(&out);
return rc;
}
/*
** Implementation of the /json/diff page.
**
*/
cson_value * json_page_diff(){
cson_object * pay = NULL;
cson_value * v = NULL;
char const * zFrom;
char const * zTo;
int nContext = 0;
if(!g.perm.Read){
json_set_err(FSL_JSON_E_DENIED,
"Requires 'o' permissions.");
return NULL;
}
zFrom = json_find_option_cstr("v1",NULL,NULL);
if(!zFrom){
zFrom = json_command_arg(2);
}
if(!zFrom){
json_set_err(FSL_JSON_E_MISSING_ARGS,
"Required 'v1' parameter is missing.");
return NULL;
}
zTo = json_find_option_cstr("v2",NULL,NULL);
if(!zTo){
zTo = json_command_arg(3);
}
if(!zTo){
json_set_err(FSL_JSON_E_MISSING_ARGS,
"Required 'v2' parameter is missing.");
return NULL;
}
nContext = json_find_option_int("context",NULL,"c",5);
v = json_generate_diff(zFrom, zTo, nContext);
if(!v){
if(!g.json.resultCode){
json_set_err(FSL_JSON_E_UNKNOWN,
"Generating diff failed for unknown reason.");
}
return NULL;
}
pay = cson_new_object();
cson_object_set(pay, "from", json_new_string(zFrom));
cson_object_set(pay, "to", json_new_string(zTo));
cson_object_set(pay, "diff", v);
v = 0;
return pay ? cson_object_value(pay) : NULL;
}