diff options
Diffstat (limited to 'pango/json/gtkjsonparser.c')
| -rw-r--r-- | pango/json/gtkjsonparser.c | 1131 |
1 files changed, 1131 insertions, 0 deletions
diff --git a/pango/json/gtkjsonparser.c b/pango/json/gtkjsonparser.c new file mode 100644 index 00000000..a2acb043 --- /dev/null +++ b/pango/json/gtkjsonparser.c @@ -0,0 +1,1131 @@ +/* + * Copyright © 2021 Benjamin Otte + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library. If not, see <http://www.gnu.org/licenses/>. + * + * Authors: Benjamin Otte <otte@gnome.org> + */ + + +#include "config.h" + +#include "gtkjsonparserprivate.h" + +typedef struct _GtkJsonBlock GtkJsonBlock; + +typedef enum { + GTK_JSON_BLOCK_TOPLEVEL, + GTK_JSON_BLOCK_OBJECT, + GTK_JSON_BLOCK_ARRAY, +} GtkJsonBlockType; + +struct _GtkJsonBlock +{ + GtkJsonBlockType type; + const guchar *value; /* start of current value to be consumed by external code */ + const guchar *member_name; /* name of current value, only used for object types */ + gsize index; /* index of the current element */ +}; + +struct _GtkJsonParser +{ + GBytes *bytes; + const guchar *reader; /* current read head, pointing as far as we've read */ + const guchar *end; /* pointer after end of data we're reading */ + + GError *error; /* if an error has happened, it's stored here. Errors aren't recoverable. */ + + GtkJsonBlock *block; /* current block */ + GtkJsonBlock *blocks; /* blocks array */ + GtkJsonBlock *blocks_end; /* blocks array */ + GtkJsonBlock blocks_preallocated[128]; /* preallocated */ +}; + +typedef enum { + WHITESPACE = (1 << 4), + STRING_ELEMENT = (1 << 5), + STRING_MARKER = (1 << 6), +} JsonCharacterType; + +#define JSON_CHARACTER_NODE_MASK ((1 << 4) - 1) + +static const guchar json_character_table[256] = { + ['\t'] = WHITESPACE, + ['\r'] = WHITESPACE, + ['\n'] = WHITESPACE, + [' '] = WHITESPACE | STRING_ELEMENT, + ['!'] = STRING_ELEMENT, + ['"'] = GTK_JSON_STRING | STRING_MARKER, + ['#'] = STRING_ELEMENT, + ['$'] = STRING_ELEMENT, + ['%'] = STRING_ELEMENT, + ['&'] = STRING_ELEMENT, + ['\''] = STRING_ELEMENT, + ['('] = STRING_ELEMENT, + [')'] = STRING_ELEMENT, + ['*'] = STRING_ELEMENT, + ['+'] = STRING_ELEMENT, + [','] = STRING_ELEMENT, + ['-'] = GTK_JSON_NUMBER | STRING_ELEMENT, + ['.'] = STRING_ELEMENT, + ['/'] = STRING_ELEMENT, + ['0'] = GTK_JSON_NUMBER | STRING_ELEMENT, + ['1'] = GTK_JSON_NUMBER | STRING_ELEMENT, + ['2'] = GTK_JSON_NUMBER | STRING_ELEMENT, + ['3'] = GTK_JSON_NUMBER | STRING_ELEMENT, + ['4'] = GTK_JSON_NUMBER | STRING_ELEMENT, + ['5'] = GTK_JSON_NUMBER | STRING_ELEMENT, + ['6'] = GTK_JSON_NUMBER | STRING_ELEMENT, + ['7'] = GTK_JSON_NUMBER | STRING_ELEMENT, + ['8'] = GTK_JSON_NUMBER | STRING_ELEMENT, + ['9'] = GTK_JSON_NUMBER | STRING_ELEMENT, + [':'] = STRING_ELEMENT, + [';'] = STRING_ELEMENT, + ['<'] = STRING_ELEMENT, + ['='] = STRING_ELEMENT, + ['>'] = STRING_ELEMENT, + ['?'] = STRING_ELEMENT, + ['@'] = STRING_ELEMENT, + ['A'] = STRING_ELEMENT, + ['B'] = STRING_ELEMENT, + ['C'] = STRING_ELEMENT, + ['D'] = STRING_ELEMENT, + ['E'] = STRING_ELEMENT, + ['F'] = STRING_ELEMENT, + ['G'] = STRING_ELEMENT, + ['H'] = STRING_ELEMENT, + ['I'] = STRING_ELEMENT, + ['J'] = STRING_ELEMENT, + ['K'] = STRING_ELEMENT, + ['L'] = STRING_ELEMENT, + ['M'] = STRING_ELEMENT, + ['N'] = STRING_ELEMENT, + ['O'] = STRING_ELEMENT, + ['P'] = STRING_ELEMENT, + ['Q'] = STRING_ELEMENT, + ['R'] = STRING_ELEMENT, + ['S'] = STRING_ELEMENT, + ['T'] = STRING_ELEMENT, + ['U'] = STRING_ELEMENT, + ['V'] = STRING_ELEMENT, + ['W'] = STRING_ELEMENT, + ['X'] = STRING_ELEMENT, + ['Y'] = STRING_ELEMENT, + ['Z'] = STRING_ELEMENT, + ['['] = GTK_JSON_ARRAY | STRING_ELEMENT, + ['\\'] = STRING_MARKER, + [']'] = STRING_ELEMENT, + ['^'] = STRING_ELEMENT, + ['_'] = STRING_ELEMENT, + ['`'] = STRING_ELEMENT, + ['a'] = STRING_ELEMENT, + ['b'] = STRING_ELEMENT, + ['c'] = STRING_ELEMENT, + ['d'] = STRING_ELEMENT, + ['e'] = STRING_ELEMENT, + ['f'] = GTK_JSON_BOOLEAN | STRING_ELEMENT, + ['g'] = STRING_ELEMENT, + ['h'] = STRING_ELEMENT, + ['i'] = STRING_ELEMENT, + ['j'] = STRING_ELEMENT, + ['k'] = STRING_ELEMENT, + ['l'] = STRING_ELEMENT, + ['m'] = STRING_ELEMENT, + ['n'] = GTK_JSON_NULL | STRING_ELEMENT, + ['o'] = STRING_ELEMENT, + ['p'] = STRING_ELEMENT, + ['q'] = STRING_ELEMENT, + ['r'] = STRING_ELEMENT, + ['s'] = STRING_ELEMENT, + ['t'] = GTK_JSON_BOOLEAN | STRING_ELEMENT, + ['u'] = STRING_ELEMENT, + ['v'] = STRING_ELEMENT, + ['w'] = STRING_ELEMENT, + ['x'] = STRING_ELEMENT, + ['y'] = STRING_ELEMENT, + ['z'] = STRING_ELEMENT, + ['{'] = GTK_JSON_OBJECT | STRING_ELEMENT, + ['|'] = STRING_ELEMENT, + ['}'] = STRING_ELEMENT, + ['~'] = STRING_ELEMENT, + [127] = STRING_ELEMENT, +}; + +static const guchar * +json_skip_characters (const guchar *start, + const guchar *end, + JsonCharacterType type) +{ + const guchar *s; + + for (s = start; s < end; s++) + { + if (!(json_character_table[*s] & type)) + break; + } + return s; +} + +static const guchar * +json_find_character (const guchar *start, + JsonCharacterType type) +{ + const guchar *s; + + for (s = start; ; s++) + { + if ((json_character_table[*s] & type)) + break; + } + return s; +} + +static void +gtk_json_parser_value_error (GtkJsonParser *self, + const char *format, + ...) G_GNUC_PRINTF(2, 3); +static void +gtk_json_parser_value_error (GtkJsonParser *self, + const char *format, + ...) +{ + va_list args; + + if (self->error) + return; + + va_start (args, format); + self->error = g_error_new_valist (G_FILE_ERROR, + G_FILE_ERROR_FAILED, + format, args); + va_end (args); +} + +static void +gtk_json_parser_syntax_error (GtkJsonParser *self, + const char *format, + ...) G_GNUC_PRINTF(2, 3); +static void +gtk_json_parser_syntax_error (GtkJsonParser *self, + const char *format, + ...) +{ + va_list args; + + if (self->error) + return; + + va_start (args, format); + self->error = g_error_new_valist (G_FILE_ERROR, + G_FILE_ERROR_FAILED, + format, args); + va_end (args); +} + +static gboolean +gtk_json_parser_is_eof (GtkJsonParser *self) +{ + return self->reader >= self->end || *self->reader == '\0'; +} + +static gsize +gtk_json_parser_remaining (GtkJsonParser *self) +{ + g_return_val_if_fail (self->reader <= self->end, 0); + + return self->end - self->reader; +} + +static void +gtk_json_parser_skip_whitespace (GtkJsonParser *self) +{ + self->reader = json_skip_characters (self->reader, self->end, WHITESPACE); +} + +static gboolean +gtk_json_parser_has_char (GtkJsonParser *self, + char c) +{ + return gtk_json_parser_remaining (self) && *self->reader == c; +} + +static gboolean +gtk_json_parser_try_char (GtkJsonParser *self, + char c) +{ + if (!gtk_json_parser_has_char (self, c)) + return FALSE; + + self->reader++; + return TRUE; +} + +static gboolean +gtk_json_parser_try_identifier_len (GtkJsonParser *self, + const char *ident, + gsize len) +{ + if (gtk_json_parser_remaining (self) < len) + return FALSE; + + if (memcmp (self->reader, ident, len) != 0) + return FALSE; + + self->reader += len; + return TRUE; +} + +#define gtk_json_parser_try_identifier(parser, ident) gtk_json_parser_try_identifier_len(parser, ident, strlen(ident)) + +/* + * decode_utf16_surrogate_pair: + * @first: the first UTF-16 code point + * @second: the second UTF-16 code point + * + * Decodes a surrogate pair of UTF-16 code points into the equivalent + * Unicode code point. + * + * If the code points are not valid, 0 is returned. + * + * Returns: the Unicode code point equivalent to the surrogate pair + */ +static inline gunichar +decode_utf16_surrogate_pair (gunichar first, + gunichar second) +{ + if (0xd800 > first || first > 0xdbff || + 0xdc00 > second || second > 0xdfff) + return 0; + + return 0x10000 + | (first & 0x3ff) << 10 + | (second & 0x3ff); +} + +static gsize +gtk_json_unescape_char (const guchar *json_escape, + char out_data[6], + gsize *out_len) +{ + switch (json_escape[1]) + { + case '"': + case '\\': + case '/': + out_data[0] = json_escape[1]; + *out_len = 1; + return 2; + case 'b': + out_data[0] = '\b'; + *out_len = 1; + return 2; + case 'f': + out_data[0] = '\f'; + *out_len = 1; + return 2; + case 'n': + out_data[0] = '\n'; + *out_len = 1; + return 2; + case 'r': + out_data[0] = '\r'; + *out_len = 1; + return 2; + case 't': + out_data[0] = '\t'; + *out_len = 1; + return 2; + case 'u': + { + gunichar unichar = (g_ascii_xdigit_value (json_escape[2]) << 12) | + (g_ascii_xdigit_value (json_escape[3]) << 8) | + (g_ascii_xdigit_value (json_escape[4]) << 4) | + (g_ascii_xdigit_value (json_escape[5])); + gsize result = 6; + + /* resolve UTF-16 surrogates for Unicode characters not in the BMP, + * as per ECMA 404, § 9, "String" + */ + if (g_unichar_type (unichar) == G_UNICODE_SURROGATE) + { + unichar = decode_utf16_surrogate_pair (unichar, + (g_ascii_xdigit_value (json_escape[8]) << 12) | + (g_ascii_xdigit_value (json_escape[9]) << 8) | + (g_ascii_xdigit_value (json_escape[10]) << 4) | + (g_ascii_xdigit_value (json_escape[11]))); + result += 6; + } + *out_len = g_unichar_to_utf8 (unichar, out_data); + return result; + } + default: + g_assert_not_reached (); + return 0; + } +} + +/* The escaped string MUST be valid json, so it must begin + * with " and end with " and must not contain any invalid + * escape codes. + * This function is meant to be fast + */ +static char * +gtk_json_unescape_string (const guchar *escaped) +{ + char buf[6]; + gsize buf_size; + GString *string; + const guchar *last, *s; + + string = NULL; + + g_assert (*escaped == '"'); + last = escaped + 1; + for (s = json_find_character (last, STRING_MARKER); + *s != '"'; + s = json_find_character (last, STRING_MARKER)) + { + g_assert (*s == '\\'); + if (string == NULL) + string = g_string_new (NULL); + g_string_append_len (string, (const char *) last, s - last); + last = s + gtk_json_unescape_char (s, buf, &buf_size); + g_string_append_len (string, buf, buf_size); + } + + if (string) + { + g_string_append_len (string, (const char *) last, s - last); + return g_string_free (string, FALSE); + } + else + { + return g_strndup ((const char *) last, s - last); + } +} + +static gboolean +gtk_json_parser_parse_string (GtkJsonParser *self) +{ + if (!gtk_json_parser_try_char (self, '"')) + { + gtk_json_parser_syntax_error (self, "Not a string"); + return FALSE; + } + + self->reader = json_skip_characters (self->reader, self->end, STRING_ELEMENT); + + while (gtk_json_parser_remaining (self)) + { + if (*self->reader < 0x20) + { + gtk_json_parser_syntax_error (self, "Disallowed control character in string literal"); + return FALSE; + } + else if (*self->reader > 127) + { + gunichar c = g_utf8_get_char_validated ((const char *) self->reader, gtk_json_parser_remaining (self)); + if (c == (gunichar) -2 || c == (gunichar) -1) + { + gtk_json_parser_syntax_error (self, "Invalid UTF-8"); + return FALSE; + } + self->reader = (const guchar *) g_utf8_next_char ((const char *) self->reader); + } + else if (*self->reader == '"') + { + self->reader++; + return TRUE; + } + else if (*self->reader == '\\') + { + if (gtk_json_parser_remaining (self) < 2) + goto end; + self->reader++; + switch (*self->reader) + { + case '"': + case '\\': + case '/': + case 'b': + case 'f': + case 'n': + case 'r': + case 't': + break; + + case 'u': + /* lots of work necessary to validate the unicode escapes here */ + if (gtk_json_parser_remaining (self) < 5 || + !g_ascii_isxdigit (self->reader[1]) || + !g_ascii_isxdigit (self->reader[2]) || + !g_ascii_isxdigit (self->reader[3]) || + !g_ascii_isxdigit (self->reader[4])) + { + gtk_json_parser_syntax_error (self, "Invalid Unicode escape sequence"); + return FALSE; + } + else + { + gunichar unichar = (g_ascii_xdigit_value (self->reader[1]) << 12) | + (g_ascii_xdigit_value (self->reader[2]) << 8) | + (g_ascii_xdigit_value (self->reader[3]) << 4) | + (g_ascii_xdigit_value (self->reader[4])); + + self->reader += 4; + /* resolve UTF-16 surrogates for Unicode characters not in the BMP, + * as per ECMA 404, § 9, "String" + */ + if (g_unichar_type (unichar) == G_UNICODE_SURROGATE) + { + if (gtk_json_parser_remaining (self) >= 7 && + self->reader[1] == '\\' && + self->reader[2] == 'u' && + g_ascii_isxdigit (self->reader[3]) && + g_ascii_isxdigit (self->reader[4]) && + g_ascii_isxdigit (self->reader[5]) && + g_ascii_isxdigit (self->reader[6])) + { + unichar = decode_utf16_surrogate_pair (unichar, + (g_ascii_xdigit_value (self->reader[3]) << 12) | + (g_ascii_xdigit_value (self->reader[4]) << 8) | + (g_ascii_xdigit_value (self->reader[5]) << 4) | + (g_ascii_xdigit_value (self->reader[6]))); + self->reader += 6; + } + else + { + unichar = 0; + } + } + + if (unichar == 0) + { + gtk_json_parser_syntax_error (self, "Invalid UTF-16 surrogate pair"); + return FALSE; + } + } + break; + default: + gtk_json_parser_syntax_error (self, "Unknown escape sequence"); + return FALSE; + } + self->reader++; + } + + self->reader = json_skip_characters (self->reader, self->end, STRING_ELEMENT); + } + +end: + gtk_json_parser_syntax_error (self, "Unterminated string literal"); + return FALSE; +} + +static gboolean +gtk_json_parser_parse_number (GtkJsonParser *self) +{ + /* sign */ + gtk_json_parser_try_char (self, '-'); + + /* integer part */ + if (!gtk_json_parser_try_char (self, '0')) + { + if (gtk_json_parser_is_eof (self) || + !g_ascii_isdigit (*self->reader)) + goto out; + + self->reader++; + + while (!gtk_json_parser_is_eof (self) && g_ascii_isdigit (*self->reader)) + self->reader++; + } + + /* fractional part */ + if (gtk_json_parser_remaining (self) >= 2 && *self->reader == '.' && g_ascii_isdigit (self->reader[1])) + { + self->reader += 2; + + while (!gtk_json_parser_is_eof (self) && g_ascii_isdigit (*self->reader)) + self->reader++; + } + + /* exponent */ + if (gtk_json_parser_remaining (self) >= 2 && (self->reader[0] == 'e' || self->reader[0] == 'E') && + (g_ascii_isdigit (self->reader[1]) || + (gtk_json_parser_remaining (self) >= 3 && (self->reader[1] == '+' || self->reader[1] == '-') && g_ascii_isdigit (self->reader[2])))) + { + self->reader += 2; + + while (!gtk_json_parser_is_eof (self) && g_ascii_isdigit (*self->reader)) + self->reader++; + } + return TRUE; + +out: + gtk_json_parser_syntax_error (self, "Not a valid number"); + return FALSE; +} + +static gboolean +gtk_json_parser_parse_value (GtkJsonParser *self) +{ + if (gtk_json_parser_is_eof (self)) + { + gtk_json_parser_syntax_error (self, "Unexpected end of document"); + return FALSE; + } + + switch (json_character_table[*self->block->value] & JSON_CHARACTER_NODE_MASK) + { + case GTK_JSON_STRING: + return gtk_json_parser_parse_string (self); + + case GTK_JSON_NUMBER: + return gtk_json_parser_parse_number (self); + + case GTK_JSON_NULL: + if (gtk_json_parser_try_identifier (self, "null")) + return TRUE; + break; + + case GTK_JSON_BOOLEAN: + if (gtk_json_parser_try_identifier (self, "true") || + gtk_json_parser_try_identifier (self, "false")) + return TRUE; + break; + + case GTK_JSON_OBJECT: + case GTK_JSON_ARRAY: + /* don't preparse objects */ + return TRUE; + + default: + break; + } + + gtk_json_parser_syntax_error (self, "Expected a value"); + return FALSE; +} + +static void +gtk_json_parser_push_block (GtkJsonParser *self, + GtkJsonBlockType type) +{ + self->block++; + if (self->block == self->blocks_end) + { + gsize old_size = self->blocks_end - self->blocks; + gsize new_size = old_size + 128; + + if (self->blocks == self->blocks_preallocated) + { + self->blocks = g_new (GtkJsonBlock, new_size); + memcpy (self->blocks, self->blocks_preallocated, sizeof (GtkJsonBlock) * G_N_ELEMENTS (self->blocks_preallocated)); + } + else + { + self->blocks = g_renew (GtkJsonBlock, self->blocks, new_size); + } + self->blocks_end = self->blocks + new_size; + self->block = self->blocks + old_size; + } + + self->block->type = type; + self->block->member_name = 0; + self->block->value = 0; + self->block->index = 0; +} + +static void +gtk_json_parser_pop_block (GtkJsonParser *self) +{ + g_assert (self->block > self->blocks); + self->block--; +} + +GtkJsonParser * +gtk_json_parser_new_for_string (const char *string, + gssize size) +{ + GtkJsonParser *self; + GBytes *bytes; + + bytes = g_bytes_new (string, size >= 0 ? size : strlen (string)); + + self = gtk_json_parser_new_for_bytes (bytes); + + g_bytes_unref (bytes); + + return self; +} + +GtkJsonParser * +gtk_json_parser_new_for_bytes (GBytes *bytes) +{ + GtkJsonParser *self; + gsize size; + + g_return_val_if_fail (bytes != NULL, NULL); + + self = g_slice_new0 (GtkJsonParser); + + self->bytes = g_bytes_ref (bytes); + self->reader = g_bytes_get_data (bytes, &size); + self->end = self->reader + size; + + self->blocks = self->blocks_preallocated; + self->blocks_end = self->blocks + G_N_ELEMENTS (self->blocks_preallocated); + self->block = self->blocks; + self->block->type = GTK_JSON_BLOCK_TOPLEVEL; + + gtk_json_parser_skip_whitespace (self); + self->block->value = self->reader; + gtk_json_parser_parse_value (self); + + return self; +} + +void +gtk_json_parser_free (GtkJsonParser *self) +{ + if (self == NULL) + return; + + g_bytes_unref (self->bytes); + + if (self->blocks != self->blocks_preallocated) + g_free (self->blocks); + + g_slice_free (GtkJsonParser, self); +} + +static gboolean +gtk_json_parser_skip_block (GtkJsonParser *self) +{ + if (self->reader != self->block->value) + return TRUE; + + if (*self->reader == '{') + { + return gtk_json_parser_start_object (self) && + gtk_json_parser_end (self); + } + else if (*self->reader == '[') + { + return gtk_json_parser_start_array (self) && + gtk_json_parser_end (self); + } + else + { + g_assert_not_reached (); + return FALSE; + } +} + +gboolean +gtk_json_parser_next (GtkJsonParser *self) +{ + if (self->error) + return FALSE; + + if (self->block->value == NULL) + return FALSE; + + if (!gtk_json_parser_skip_block (self)) + { + g_assert (self->error); + return FALSE; + } + + switch (self->block->type) + { + case GTK_JSON_BLOCK_TOPLEVEL: + gtk_json_parser_skip_whitespace (self); + if (gtk_json_parser_is_eof (self)) + { + self->block->value = NULL; + if (gtk_json_parser_remaining (self)) + { + gtk_json_parser_syntax_error (self, "Unexpected nul byte in document"); + } + } + else + { + gtk_json_parser_syntax_error (self, "Data at end of document"); + } + return FALSE; + + case GTK_JSON_BLOCK_OBJECT: + gtk_json_parser_skip_whitespace (self); + if (gtk_json_parser_is_eof (self)) + { + gtk_json_parser_syntax_error (self, "Unexpected end of document"); + self->block->member_name = NULL; + self->block->value = NULL; + } + if (gtk_json_parser_has_char (self, '}')) + { + self->block->member_name = NULL; + self->block->value = NULL; + return FALSE; + } + if (!gtk_json_parser_try_char (self, ',')) + { + gtk_json_parser_syntax_error (self, "Expected a ',' to separate object members"); + return FALSE; + } + gtk_json_parser_skip_whitespace (self); + self->block->member_name = self->reader; + + if (!gtk_json_parser_parse_string (self)) + return FALSE; + gtk_json_parser_skip_whitespace (self); + if (!gtk_json_parser_try_char (self, ':')) + { + gtk_json_parser_syntax_error (self, "Missing ':' after member name"); + return FALSE; + } + + gtk_json_parser_skip_whitespace (self); + self->block->value = self->reader; + if (!gtk_json_parser_parse_value (self)) + return FALSE; + break; + + case GTK_JSON_BLOCK_ARRAY: + gtk_json_parser_skip_whitespace (self); + if (gtk_json_parser_is_eof (self)) + { + gtk_json_parser_syntax_error (self, "Unexpected end of document"); + self->block->member_name = NULL; + self->block->value = NULL; + } + if (gtk_json_parser_has_char (self, ']')) + { + self->block->value = NULL; + return FALSE; + } + + if (!gtk_json_parser_try_char (self, ',')) + { + gtk_json_parser_syntax_error (self, "Expected a ',' to separate array members"); + return FALSE; + } + + gtk_json_parser_skip_whitespace (self); + self->block->value = self->reader; + if (!gtk_json_parser_parse_value (self)) + return FALSE; + break; + + default: + g_assert_not_reached (); + break; + } + + return TRUE; +} + +GtkJsonNode +gtk_json_parser_get_node (GtkJsonParser *self) +{ + if (self->error) + return GTK_JSON_NONE; + + if (self->block->value == NULL) + return GTK_JSON_NONE; + + return (json_character_table[*self->block->value] & JSON_CHARACTER_NODE_MASK); +} + +const GError * +gtk_json_parser_get_error (GtkJsonParser *self) +{ + return self->error; +} + +char * +gtk_json_parser_get_member_name (GtkJsonParser *self) +{ + if (self->error) + return NULL; + + if (self->block->type != GTK_JSON_BLOCK_OBJECT) + return NULL; + + if (self->block->member_name == NULL) + return NULL; + + return gtk_json_unescape_string (self->block->member_name); +} + +gssize +gtk_json_parser_select_member (GtkJsonParser *self, + const char * const *options) +{ + char *member_name; + gssize i; + + member_name = gtk_json_parser_get_member_name (self); + if (member_name == NULL) + return -1; + + for (i = 0; options[i]; i++) + { + if (strcmp (member_name, options[i]) == 0) + break; + } + if (options[i] == NULL) + i = -1; + + g_free (member_name); + + return i; +} + +gboolean +gtk_json_parser_get_boolean (GtkJsonParser *self) +{ + if (self->error) + return FALSE; + + if (self->block->value == NULL) + return FALSE; + + if (*self->block->value == 't') + return TRUE; + else if (*self->block->value == 'f') + return FALSE; + + gtk_json_parser_value_error (self, "Expected a boolean value"); + return FALSE; +} + +double +gtk_json_parser_get_number (GtkJsonParser *self) +{ + double result; + + if (self->error) + return 0; + + if (self->block->value == NULL) + return 0; + + if (!strchr ("-0123456789", *self->block->value)) + { + gtk_json_parser_value_error (self, "Expected a number"); + return 0; + } + + errno = 0; + if (gtk_json_parser_remaining (self) == 0) + { + /* need terminated string here */ + char *s = g_strndup ((const char *) self->block->value, self->reader - self->block->value); + result = g_ascii_strtod (s, NULL); + g_free (s); + } + else + { + result = g_ascii_strtod ((const char *) self->block->value, NULL); + } + + if (errno) + { + if (errno == ERANGE) + gtk_json_parser_value_error (self, "Number out of range"); + else + gtk_json_parser_value_error (self, "%s", g_strerror (errno)); + + return 0; + } + + return result; +} + +int +gtk_json_parser_get_int (GtkJsonParser *self) +{ + int result; + + if (self->error) + return 0; + + if (self->block->value == NULL) + return 0; + + if (!strchr ("-0123456789", *self->block->value)) + { + gtk_json_parser_value_error (self, "Expected a number"); + return 0; + } + + errno = 0; + if (gtk_json_parser_remaining (self) == 0) + { + /* need terminated string here */ + char *s = g_strndup ((const char *) self->block->value, self->reader - self->block->value); + result = g_ascii_strtod (s, NULL); + g_free (s); + } + else + { + result = (int) g_ascii_strtoll ((const char *) self->block->value, NULL, 10); + } + + if (errno) + { + if (errno == ERANGE) + gtk_json_parser_value_error (self, "Number out of range"); + else + gtk_json_parser_value_error (self, "%s", g_strerror (errno)); + + return 0; + } + + return result; +} + +#if 0 +int gtk_json_parser_get_int (GtkJsonParser *self); +guint gtk_json_parser_get_uint (GtkJsonParser *self); +#endif + +char * +gtk_json_parser_get_string (GtkJsonParser *self) +{ + if (self->error) + return g_strdup (""); + + if (self->block->value == NULL) + return g_strdup (""); + + if (*self->block->value != '"') + { + gtk_json_parser_value_error (self, "Expected a string"); + return g_strdup (""); + } + + return gtk_json_unescape_string (self->block->value); +} + +gboolean +gtk_json_parser_start_object (GtkJsonParser *self) +{ + if (self->error) + return FALSE; + + if (!gtk_json_parser_try_char (self, '{')) + { + gtk_json_parser_value_error (self, "Expected an object"); + return FALSE; + } + + gtk_json_parser_push_block (self, GTK_JSON_BLOCK_OBJECT); + + gtk_json_parser_skip_whitespace (self); + if (gtk_json_parser_is_eof (self)) + { + gtk_json_parser_syntax_error (self, "Unexpected end of document"); + return FALSE; + } + if (gtk_json_parser_has_char (self, '}')) + return TRUE; + self->block->member_name = self->reader; + + if (!gtk_json_parser_parse_string (self)) + return FALSE; + gtk_json_parser_skip_whitespace (self); + if (!gtk_json_parser_try_char (self, ':')) + { + gtk_json_parser_syntax_error (self, "Missing ':' after member name"); + return FALSE; + } + + gtk_json_parser_skip_whitespace (self); + self->block->value = self->reader; + if (!gtk_json_parser_parse_value (self)) + return FALSE; + + return TRUE; +} + +gboolean +gtk_json_parser_start_array (GtkJsonParser *self) +{ + if (self->error) + return FALSE; + + if (!gtk_json_parser_try_char (self, '[')) + { + gtk_json_parser_value_error (self, "Expected an array"); + return FALSE; + } + + gtk_json_parser_push_block (self, GTK_JSON_BLOCK_ARRAY); + gtk_json_parser_skip_whitespace (self); + if (gtk_json_parser_is_eof (self)) + { + gtk_json_parser_syntax_error (self, "Unexpected end of document"); + return FALSE; + } + if (gtk_json_parser_has_char (self, ']')) + { + self->block->value = NULL; + return TRUE; + } + self->block->value = self->reader; + if (!gtk_json_parser_parse_value (self)) + return FALSE; + + return TRUE; +} + +gboolean +gtk_json_parser_end (GtkJsonParser *self) +{ + char bracket; + + g_return_val_if_fail (self != NULL, FALSE); + + while (gtk_json_parser_next (self)); + + if (self->error) + return FALSE; + + switch (self->block->type) + { + case GTK_JSON_BLOCK_OBJECT: + bracket = '}'; + break; + case GTK_JSON_BLOCK_ARRAY: + bracket = ']'; + break; + case GTK_JSON_BLOCK_TOPLEVEL: + default: + g_return_val_if_reached (FALSE); + } + + if (!gtk_json_parser_try_char (self, bracket)) + { + gtk_json_parser_syntax_error (self, "No terminating '%c'", bracket); + return FALSE; + } + + gtk_json_parser_pop_block (self); + + return TRUE; +} + |