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/*
* solv_jsonparser.c
*
* Simple JSON stream parser
*
* Copyright (c) 2018, SUSE LLC
*
* This program is licensed under the BSD license, read LICENSE.BSD
* for further information
*/
#include <stdio.h>
#include <stdlib.h>
#include "util.h"
#include "solv_jsonparser.h"
struct solv_jsonparser *
jsonparser_init(struct solv_jsonparser *jp, FILE *fp)
{
memset(jp, 0, sizeof(*jp));
jp->fp = fp;
jp->state = JP_START;
jp->line = jp->nextline = 1;
jp->nextc = ' ';
queue_init(&jp->stateq);
return jp;
}
struct solv_jsonparser *
jsonparser_free(struct solv_jsonparser *jp)
{
queue_free(&jp->stateq);
return 0;
}
static void
savec(struct solv_jsonparser *jp, char c)
{
if (jp->nspace == jp->aspace)
{
jp->aspace += 256;
jp->space = solv_realloc(jp->space, jp->aspace);
}
jp->space[jp->nspace++] = c;
}
static void
saveutf8(struct solv_jsonparser *jp, int c)
{
int i;
if (c < 0x80)
{
savec(jp, c);
return;
}
i = c < 0x800 ? 1 : c < 0x10000 ? 2 : 3;
savec(jp, (0x1f80 >> i) | (c >> (6 * i)));
while (--i >= 0)
savec(jp, 0x80 | ((c >> (6 * i)) & 0x3f));
}
static inline int
nextc(struct solv_jsonparser *jp)
{
int c = getc(jp->fp);
if (c == '\n')
jp->nextline++;
return c;
}
static int
skipspace(struct solv_jsonparser *jp)
{
int c = jp->nextc;
while (c == ' ' || c == '\t' || c == '\r' || c == '\n')
c = nextc(jp);
jp->line = jp->nextline;
return (jp->nextc = c);
}
static int
parseliteral(struct solv_jsonparser *jp)
{
size_t nspace = jp->nspace;
int c;
savec(jp, jp->nextc);
for (;;)
{
c = nextc(jp);
if (c < 'a' || c > 'z')
break;
savec(jp, c);
}
jp->nextc = c;
savec(jp, 0);
if (!strcmp(jp->space + nspace, "true"))
return JP_BOOL;
if (!strcmp(jp->space + nspace, "false"))
return JP_BOOL;
if (!strcmp(jp->space + nspace, "null"))
return JP_NULL;
return JP_ERROR;
}
static int
parsenumber(struct solv_jsonparser *jp)
{
int c;
savec(jp, jp->nextc);
for (;;)
{
c = nextc(jp);
if ((c < '0' || c > '9') && c != '+' && c != '-' && c != '.' && c != 'e' && c != 'E')
break;
savec(jp, c);
}
jp->nextc = c;
savec(jp, 0);
return JP_NUMBER;
}
static int
parseutf8(struct solv_jsonparser *jp, int surrogate)
{
int c, i, r = 0;
/* parse 4-digit hex */
for (i = 0; i < 4; i++)
{
c = nextc(jp);
if (c >= '0' && c <= '9')
c -= '0';
else if (c >= 'a' && c <= 'f')
c -= 'a' - 10;
else if (c >= 'A' && c <= 'F')
c -= 'A' - 10;
else
return -1;
r = (r << 4) | c;
}
if (!surrogate && r >= 0xd800 && r < 0xdc00)
{
/* utf16 surrogate pair encodes 0x10000 - 0x10ffff */
int r2;
if (nextc(jp) != '\\' || nextc(jp) != 'u' || (r2 = parseutf8(jp, 1)) < 0xdc00 || r2 >= 0xe000)
return -1;
r = 0x10000 + ((r & 0x3ff) << 10 | (r2 & 0x3ff));
}
return r;
}
static int
parsestring(struct solv_jsonparser *jp)
{
int c;
for (;;)
{
if ((c = nextc(jp)) < 32)
return JP_ERROR;
if (c == '"')
break;
if (c == '\\')
{
switch (c = nextc(jp))
{
case '"':
case '\\':
case '/':
case '\n':
break;
case 'b':
c = '\b';
break;
case 'f':
c = '\f';
break;
case 'n':
c = '\n';
break;
case 'r':
c = '\r';
break;
case 't':
c = '\t';
break;
case 'u':
if ((c = parseutf8(jp, 0)) < 0)
return JP_ERROR;
saveutf8(jp, c);
continue;
default:
return JP_ERROR;
}
}
savec(jp, c);
}
jp->nextc = ' ';
savec(jp, 0);
return JP_STRING;
}
static int
parsevalue(struct solv_jsonparser *jp)
{
int c = skipspace(jp);
if (c == '"')
return parsestring(jp);
if ((c >= '0' && c <= '9') || c == '+' || c == '-' || c == '.')
return parsenumber(jp);
if ((c >= 'a' && c <= 'z'))
return parseliteral(jp);
jp->nextc = ' ';
if (c == '[')
return JP_ARRAY;
if (c == '{')
return JP_OBJECT;
if (c == ']')
return JP_ARRAY_END;
if (c == '}')
return JP_OBJECT_END;
return JP_ERROR;
}
int
jsonparser_parse(struct solv_jsonparser *jp)
{
int type;
size_t nspace;
jp->depth = jp->stateq.count;
jp->key = jp->value = 0;
jp->keylen = jp->valuelen = 0;
nspace = jp->nspace = 0;
if (jp->state == JP_END)
return JP_END;
if (jp->state == JP_START)
jp->state = JP_END;
type = parsevalue(jp);
if (type <= 0)
return JP_ERROR;
if (type == JP_OBJECT_END || type == JP_ARRAY_END)
{
if (jp->state != type - 1)
return JP_ERROR;
jp->state = queue_pop(&jp->stateq);
}
else if (jp->state == JP_OBJECT)
{
nspace = jp->nspace;
if (type != JP_STRING)
return JP_ERROR;
if (skipspace(jp) != ':')
return JP_ERROR;
jp->nextc = ' ';
type = parsevalue(jp);
if (type == JP_OBJECT_END || type == JP_ARRAY_END)
return JP_ERROR;
jp->key = jp->space;
jp->keylen = nspace - 1;
}
if (type == JP_STRING || type == JP_NUMBER || type == JP_BOOL || type == JP_NULL)
{
jp->value = jp->space + nspace;
jp->valuelen = jp->nspace - nspace - 1;
}
if (type == JP_ARRAY || type == JP_OBJECT)
{
queue_push(&jp->stateq, jp->state);
jp->state = type;
}
else if (jp->state == JP_OBJECT || jp->state == JP_ARRAY)
{
int c = skipspace(jp);
if (c == ',')
jp->nextc = ' ';
else if (c != (jp->state == JP_OBJECT ? '}' : ']'))
return JP_ERROR;
}
return type;
}
int
jsonparser_skip(struct solv_jsonparser *jp, int type)
{
if (type == JP_ARRAY || type == JP_OBJECT)
{
int depth = jp->depth + 1, endtype = type + 1;
while (type > 0 && (type != endtype || jp->depth != depth))
type = jsonparser_parse(jp);
}
return type;
}
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