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-rw-r--r--src/reader.c1638
1 files changed, 37 insertions, 1601 deletions
diff --git a/src/reader.c b/src/reader.c
index a1c517e3..d515aaab 100644
--- a/src/reader.c
+++ b/src/reader.c
@@ -16,7 +16,6 @@
#include "serd_internal.h"
-#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <stdarg.h>
@@ -25,67 +24,7 @@
#include <stdlib.h>
#include <string.h>
-#define TRY_THROW(exp) if (!(exp)) goto except;
-#define TRY_RET(exp) if (!(exp)) return 0;
-
-#ifdef SERD_STACK_CHECK
-# define SERD_STACK_ASSERT_TOP(reader, ref) \
- assert(ref == reader->allocs[reader->n_allocs - 1]);
-#else
-# define SERD_STACK_ASSERT_TOP(reader, ref)
-#endif
-
-/* Reference to a node in the stack (we can not use pointers since the
- stack may be reallocated, invalidating any pointers to elements).
-*/
-typedef size_t Ref;
-
-typedef struct {
- Ref graph;
- Ref subject;
- Ref predicate;
- Ref object;
- Ref datatype;
- Ref lang;
- SerdStatementFlags* flags;
-} ReadContext;
-
-struct SerdReaderImpl {
- void* handle;
- void (*free_handle)(void* ptr);
- SerdBaseSink base_sink;
- SerdPrefixSink prefix_sink;
- SerdStatementSink statement_sink;
- SerdEndSink end_sink;
- SerdErrorSink error_sink;
- void* error_handle;
- Ref rdf_first;
- Ref rdf_rest;
- Ref rdf_nil;
- SerdNode default_graph;
- SerdByteSource source;
- SerdStack stack;
- SerdSyntax syntax;
- unsigned next_id;
- SerdStatus status;
- uint8_t* buf;
- uint8_t* bprefix;
- size_t bprefix_len;
- bool strict; ///< True iff strict parsing
- bool seen_genid;
-#ifdef SERD_STACK_CHECK
- Ref* allocs; ///< Stack of push offsets
- size_t n_allocs; ///< Number of stack pushes
-#endif
-};
-
-static inline bool
-fancy_syntax(const SerdReader* reader)
-{
- return reader->syntax == SERD_TURTLE || reader->syntax == SERD_TRIG;
-}
-
-static int
+int
r_err(SerdReader* reader, SerdStatus st, const char* fmt, ...)
{
va_list args;
@@ -97,58 +36,43 @@ r_err(SerdReader* reader, SerdStatus st, const char* fmt, ...)
return 0;
}
-/** fread-like wrapper for getc (which is faster). */
-static size_t
-serd_file_read_byte(void* buf, size_t size, size_t nmemb, void* stream)
-{
- const int c = getc((FILE*)stream);
- if (c == EOF) {
- *((uint8_t*)buf) = 0;
- return 0;
- }
- *((uint8_t*)buf) = (uint8_t)c;
- return 1;
-}
-
-static inline uint8_t
-peek_byte(SerdReader* reader)
+void
+set_blank_id(SerdReader* reader, Ref ref, size_t buf_size)
{
- return serd_byte_source_peek(&reader->source);
+ SerdNode* node = deref(reader, ref);
+ const char* prefix = reader->bprefix ? (const char*)reader->bprefix : "";
+ node->n_bytes = node->n_chars = snprintf(
+ (char*)node->buf, buf_size, "%sb%u", prefix, reader->next_id++);
}
-static inline uint8_t
-eat_byte_safe(SerdReader* reader, const uint8_t byte)
+size_t
+genid_size(SerdReader* reader)
{
- assert(peek_byte(reader) == byte);
- const SerdStatus st = serd_byte_source_advance(&reader->source);
- if (st) {
- reader->status = st;
- }
- return byte;
+ return reader->bprefix_len + 1 + 10 + 1; // + "b" + UINT32_MAX + \0
}
-static inline uint8_t
-eat_byte_check(SerdReader* reader, const uint8_t byte)
+Ref
+blank_id(SerdReader* reader)
{
- const uint8_t c = peek_byte(reader);
- if (c != byte) {
- return r_err(reader, SERD_ERR_BAD_SYNTAX,
- "expected `%c', not `%c'\n", byte, c);
- }
- return eat_byte_safe(reader, byte);
+ Ref ref = push_node_padded(reader, genid_size(reader), SERD_BLANK, "", 0);
+ set_blank_id(reader, ref, genid_size(reader));
+ return ref;
}
-static inline bool
-eat_string(SerdReader* reader, const char* str, unsigned n)
+/** fread-like wrapper for getc (which is faster). */
+static size_t
+serd_file_read_byte(void* buf, size_t size, size_t nmemb, void* stream)
{
- bool bad = false;
- for (unsigned i = 0; i < n; ++i) {
- bad |= (bool)eat_byte_check(reader, ((const uint8_t*)str)[i]);
+ const int c = getc((FILE*)stream);
+ if (c == EOF) {
+ *((uint8_t*)buf) = 0;
+ return 0;
}
- return bad;
+ *((uint8_t*)buf) = (uint8_t)c;
+ return 1;
}
-static Ref
+Ref
push_node_padded(SerdReader* reader, size_t maxlen,
SerdType type, const char* str, size_t n_bytes)
{
@@ -172,13 +96,13 @@ push_node_padded(SerdReader* reader, size_t maxlen,
return (uint8_t*)node - reader->stack.buf;
}
-static Ref
+Ref
push_node(SerdReader* reader, SerdType type, const char* str, size_t n_bytes)
{
return push_node_padded(reader, n_bytes, type, str, n_bytes);
}
-static inline SerdNode*
+SerdNode*
deref(SerdReader* reader, const Ref ref)
{
if (ref) {
@@ -189,29 +113,7 @@ deref(SerdReader* reader, const Ref ref)
return NULL;
}
-static inline void
-push_byte(SerdReader* reader, Ref ref, const uint8_t c)
-{
- SERD_STACK_ASSERT_TOP(reader, ref);
- uint8_t* const s = serd_stack_push(&reader->stack, 1);
- SerdNode* const node = (SerdNode*)(reader->stack.buf + ref);
- ++node->n_bytes;
- if (!(c & 0x80)) { // Starts with 0 bit, start of new character
- ++node->n_chars;
- }
- *(s - 1) = c;
- *s = '\0';
-}
-
-static inline void
-push_bytes(SerdReader* reader, Ref ref, const uint8_t* bytes, unsigned len)
-{
- for (unsigned i = 0; i < len; ++i) {
- push_byte(reader, ref, bytes[i]);
- }
-}
-
-static Ref
+Ref
pop_node(SerdReader* reader, Ref ref)
{
if (ref && ref != reader->rdf_first && ref != reader->rdf_rest
@@ -227,7 +129,7 @@ pop_node(SerdReader* reader, Ref ref)
return 0;
}
-static inline bool
+bool
emit_statement(SerdReader* reader, ReadContext ctx, Ref o, Ref d, Ref l)
{
SerdNode* graph = deref(reader, ctx.graph);
@@ -244,1479 +146,11 @@ emit_statement(SerdReader* reader, ReadContext ctx, Ref o, Ref d, Ref l)
}
static bool
-read_collection(SerdReader* reader, ReadContext ctx, Ref* dest);
-
-static bool
-read_predicateObjectList(SerdReader* reader, ReadContext ctx, bool* ate_dot);
-
-static inline uint8_t
-read_HEX(SerdReader* reader)
-{
- const uint8_t c = peek_byte(reader);
- return is_xdigit(c)
- ? eat_byte_safe(reader, c)
- : r_err(reader, SERD_ERR_BAD_SYNTAX,
- "invalid hexadecimal digit `%c'\n", c);
-}
-
-// Read UCHAR escape, initial \ is already eaten by caller
-static inline bool
-read_UCHAR(SerdReader* reader, Ref dest, uint32_t* char_code)
-{
- const uint8_t b = peek_byte(reader);
- unsigned length = 0;
- switch (b) {
- case 'U':
- length = 8;
- break;
- case 'u':
- length = 4;
- break;
- default:
- return false;
- }
- eat_byte_safe(reader, b);
-
- uint8_t buf[9] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
- for (unsigned i = 0; i < length; ++i) {
- if (!(buf[i] = read_HEX(reader))) {
- return false;
- }
- }
-
- uint32_t code;
- sscanf((const char*)buf, "%X", &code);
-
- unsigned size = 0;
- if (code < 0x00000080) {
- size = 1;
- } else if (code < 0x00000800) {
- size = 2;
- } else if (code < 0x00010000) {
- size = 3;
- } else if (code < 0x00110000) {
- size = 4;
- } else {
- r_err(reader, SERD_ERR_BAD_SYNTAX,
- "unicode character 0x%X out of range\n", code);
- push_bytes(reader, dest, replacement_char, 3);
- *char_code = 0xFFFD;
- return true;
- }
-
- // Build output in buf
- // (Note # of bytes = # of leading 1 bits in first byte)
- uint32_t c = code;
- switch (size) {
- case 4:
- buf[3] = 0x80 | (uint8_t)(c & 0x3F);
- c >>= 6;
- c |= (16 << 12); // set bit 4
- case 3:
- buf[2] = 0x80 | (uint8_t)(c & 0x3F);
- c >>= 6;
- c |= (32 << 6); // set bit 5
- case 2:
- buf[1] = 0x80 | (uint8_t)(c & 0x3F);
- c >>= 6;
- c |= 0xC0; // set bits 6 and 7
- case 1:
- buf[0] = (uint8_t)c;
- }
-
- push_bytes(reader, dest, buf, size);
- *char_code = code;
- return true;
-}
-
-// Read ECHAR escape, initial \ is already eaten by caller
-static inline bool
-read_ECHAR(SerdReader* reader, Ref dest, SerdNodeFlags* flags)
-{
- const uint8_t c = peek_byte(reader);
- switch (c) {
- case 't':
- eat_byte_safe(reader, 't');
- push_byte(reader, dest, '\t');
- return true;
- case 'b':
- eat_byte_safe(reader, 'b');
- push_byte(reader, dest, '\b');
- return true;
- case 'n':
- *flags |= SERD_HAS_NEWLINE;
- eat_byte_safe(reader, 'n');
- push_byte(reader, dest, '\n');
- return true;
- case 'r':
- *flags |= SERD_HAS_NEWLINE;
- eat_byte_safe(reader, 'r');
- push_byte(reader, dest, '\r');
- return true;
- case 'f':
- eat_byte_safe(reader, 'f');
- push_byte(reader, dest, '\f');
- return true;
- case '\\': case '"': case '\'':
- push_byte(reader, dest, eat_byte_safe(reader, c));
- return true;
- default:
- return false;
- }
-}
-
-static inline SerdStatus
-bad_char(SerdReader* reader, const char* fmt, uint8_t c)
-{
- // Skip bytes until the next start byte
- for (uint8_t b = peek_byte(reader); (b & 0x80);) {
- eat_byte_safe(reader, b);
- b = peek_byte(reader);
- }
-
- r_err(reader, SERD_ERR_BAD_SYNTAX, fmt, c);
- return reader->strict ? SERD_ERR_BAD_SYNTAX : SERD_FAILURE;
-}
-
-static SerdStatus
-read_utf8_bytes(SerdReader* reader, uint8_t bytes[4], uint32_t* size, uint8_t c)
-{
- *size = utf8_num_bytes(c);
- if (*size <= 1 || *size > 4) {
- return bad_char(reader, "invalid UTF-8 start 0x%X\n", c);
- }
-
- bytes[0] = c;
- for (unsigned i = 1; i < *size; ++i) {
- if (((bytes[i] = peek_byte(reader)) & 0x80) == 0) {
- return bad_char(reader, "invalid UTF-8 continuation 0x%X\n",
- bytes[i]);
- }
- eat_byte_safe(reader, bytes[i]);
- }
-
- return SERD_SUCCESS;
-}
-
-static SerdStatus
-read_utf8_character(SerdReader* reader, Ref dest, uint8_t c)
-{
- uint32_t size;
- uint8_t bytes[4];
- SerdStatus st = read_utf8_bytes(reader, bytes, &size, c);
- if (st) {
- push_bytes(reader, dest, replacement_char, 3);
- } else {
- push_bytes(reader, dest, bytes, size);
- }
- return st;
-}
-
-static SerdStatus
-read_utf8_code(SerdReader* reader, Ref dest, uint32_t* code, uint8_t c)
-{
- uint32_t size;
- uint8_t bytes[4];
- SerdStatus st = read_utf8_bytes(reader, bytes, &size, c);
- if (st) {
- push_bytes(reader, dest, replacement_char, 3);
- return st;
- }
-
- push_bytes(reader, dest, bytes, size);
- *code = parse_counted_utf8_char(bytes, size);
- return st;
-}
-
-// Read one character (possibly multi-byte)
-// The first byte, c, has already been eaten by caller
-static inline SerdStatus
-read_character(SerdReader* reader, Ref dest, SerdNodeFlags* flags, uint8_t c)
-{
- if (!(c & 0x80)) {
- switch (c) {
- case 0xA: case 0xD:
- *flags |= SERD_HAS_NEWLINE;
- break;
- case '"': case '\'':
- *flags |= SERD_HAS_QUOTE;
- break;
- }
- push_byte(reader, dest, c);
- return SERD_SUCCESS;
- }
- return read_utf8_character(reader, dest, c);
-}
-
-// [10] comment ::= '#' ( [^#xA #xD] )*
-static void
-read_comment(SerdReader* reader)
-{
- eat_byte_safe(reader, '#');
- uint8_t c;
- while (((c = peek_byte(reader)) != 0xA) && (c != 0xD) && c) {
- eat_byte_safe(reader, c);
- }
-}
-
-// [24] ws ::= #x9 | #xA | #xD | #x20 | comment
-static inline bool
-read_ws(SerdReader* reader)
-{
- const uint8_t c = peek_byte(reader);
- switch (c) {
- case 0x9: case 0xA: case 0xD: case 0x20:
- eat_byte_safe(reader, c);
- return true;
- case '#':
- read_comment(reader);
- return true;
- default:
- return false;
- }
-}
-
-static inline bool
-read_ws_star(SerdReader* reader)
-{
- while (read_ws(reader)) {}
- return true;
-}
-
-static inline bool
-peek_delim(SerdReader* reader, const char delim)
-{
- read_ws_star(reader);
- return peek_byte(reader) == delim;
-}
-
-static inline bool
-eat_delim(SerdReader* reader, const char delim)
-{
- if (peek_delim(reader, delim)) {
- eat_byte_safe(reader, delim);
- return read_ws_star(reader);
- }
- return false;
-}
-
-// STRING_LITERAL_LONG_QUOTE and STRING_LITERAL_LONG_SINGLE_QUOTE
-// Initial triple quotes are already eaten by caller
-static Ref
-read_STRING_LITERAL_LONG(SerdReader* reader, SerdNodeFlags* flags, uint8_t q)
-{
- Ref ref = push_node(reader, SERD_LITERAL, "", 0);
- while (!reader->status) {
- const uint8_t c = peek_byte(reader);
- uint32_t code;
- switch (c) {
- case '\\':
- eat_byte_safe(reader, c);
- if (!read_ECHAR(reader, ref, flags) &&
- !read_UCHAR(reader, ref, &code)) {
- r_err(reader, SERD_ERR_BAD_SYNTAX,
- "invalid escape `\\%c'\n", peek_byte(reader));
- return pop_node(reader, ref);
- }
- break;
- default:
- if (c == q) {
- eat_byte_safe(reader, q);
- const uint8_t q2 = eat_byte_safe(reader, peek_byte(reader));
- const uint8_t q3 = peek_byte(reader);
- if (q2 == q && q3 == q) { // End of string
- eat_byte_safe(reader, q3);
- return ref;
- }
- *flags |= SERD_HAS_QUOTE;
- push_byte(reader, ref, c);
- read_character(reader, ref, flags, q2);
- } else {
- read_character(reader, ref, flags, eat_byte_safe(reader, c));
- }
- }
- }
- return ref;
-}
-
-// STRING_LITERAL_QUOTE and STRING_LITERAL_SINGLE_QUOTE
-// Initial quote is already eaten by caller
-static Ref
-read_STRING_LITERAL(SerdReader* reader, SerdNodeFlags* flags, uint8_t q)
-{
- Ref ref = push_node(reader, SERD_LITERAL, "", 0);
- while (!reader->status) {
- const uint8_t c = peek_byte(reader);
- uint32_t code = 0;
- switch (c) {
- case '\n': case '\r':
- r_err(reader, SERD_ERR_BAD_SYNTAX, "line end in short string\n");
- return pop_node(reader, ref);
- case '\\':
- eat_byte_safe(reader, c);
- if (!read_ECHAR(reader, ref, flags) &&
- !read_UCHAR(reader, ref, &code)) {
- r_err(reader, SERD_ERR_BAD_SYNTAX,
- "invalid escape `\\%c'\n", peek_byte(reader));
- return pop_node(reader, ref);
- }
- break;
- default:
- if (c == q) {
- eat_byte_check(reader, q);
- return ref;
- } else {
- read_character(reader, ref, flags, eat_byte_safe(reader, c));
- }
- }
- }
- eat_byte_check(reader, q);
- return ref;
-}
-
-static Ref
-read_String(SerdReader* reader, SerdNodeFlags* flags)
-{
- const uint8_t q1 = peek_byte(reader);
- eat_byte_safe(reader, q1);
-
- const uint8_t q2 = peek_byte(reader);
- if (q2 != q1) { // Short string (not triple quoted)
- return read_STRING_LITERAL(reader, flags, q1);
- }
-
- eat_byte_safe(reader, q2);
- const uint8_t q3 = peek_byte(reader);
- if (q3 != q1) { // Empty short string ("" or '')
- return push_node(reader, SERD_LITERAL, "", 0);
- }
-
- if (!fancy_syntax(reader)) {
- return r_err(reader, SERD_ERR_BAD_SYNTAX,
- "syntax does not support long literals\n");
- }
-
- eat_byte_safe(reader, q3);
- return read_STRING_LITERAL_LONG(reader, flags, q1);
-}
-
-static inline bool
-is_PN_CHARS_BASE(const uint32_t c)
-{
- return ((c >= 0x00C0 && c <= 0x00D6) || (c >= 0x00D8 && c <= 0x00F6) ||
- (c >= 0x00F8 && c <= 0x02FF) || (c >= 0x0370 && c <= 0x037D) ||
- (c >= 0x037F && c <= 0x1FFF) || (c >= 0x200C && c <= 0x200D) ||
- (c >= 0x2070 && c <= 0x218F) || (c >= 0x2C00 && c <= 0x2FEF) ||
- (c >= 0x3001 && c <= 0xD7FF) || (c >= 0xF900 && c <= 0xFDCF) ||
- (c >= 0xFDF0 && c <= 0xFFFD) || (c >= 0x10000 && c <= 0xEFFFF));
-}
-
-static SerdStatus
-read_PN_CHARS_BASE(SerdReader* reader, Ref dest)
-{
- uint32_t code;
- const uint8_t c = peek_byte(reader);
- SerdStatus st = SERD_SUCCESS;
- if (is_alpha(c)) {
- push_byte(reader, dest, eat_byte_safe(reader, c));
- } else if (!(c & 0x80)) {
- return SERD_FAILURE;
- } else if ((st = read_utf8_code(reader, dest, &code,
- eat_byte_safe(reader, c)))) {
- return st;
- } else if (!is_PN_CHARS_BASE(code)) {
- r_err(reader, SERD_ERR_BAD_SYNTAX,
- "invalid character U+%04X in name\n", code);
- if (reader->strict) {
- return SERD_ERR_BAD_SYNTAX;
- }
- }
- return st;
-}
-
-static inline bool
-is_PN_CHARS(const uint32_t c)
-{
- return (is_PN_CHARS_BASE(c) || c == 0xB7 ||
- (c >= 0x0300 && c <= 0x036F) || (c >= 0x203F && c <= 0x2040));
-}
-
-static SerdStatus
-read_PN_CHARS(SerdReader* reader, Ref dest)
-{
- uint32_t code;
- const uint8_t c = peek_byte(reader);
- SerdStatus st = SERD_SUCCESS;
- if (is_alpha(c) || is_digit(c) || c == '_' || c == '-') {
- push_byte(reader, dest, eat_byte_safe(reader, c));
- } else if (!(c & 0x80)) {
- return SERD_FAILURE;
- } else if ((st = read_utf8_code(reader, dest, &code,
- eat_byte_safe(reader, c)))) {
- return st;
- } else if (!is_PN_CHARS(code)) {
- r_err(reader, (st = SERD_ERR_BAD_SYNTAX),
- "invalid character U+%04X in name\n", code);
- }
- return st;
-}
-
-static bool
-read_PERCENT(SerdReader* reader, Ref dest)
-{
- push_byte(reader, dest, eat_byte_safe(reader, '%'));
- const uint8_t h1 = read_HEX(reader);
- const uint8_t h2 = read_HEX(reader);
- if (h1 && h2) {
- push_byte(reader, dest, h1);
- push_byte(reader, dest, h2);
- return true;
- }
- return false;
-}
-
-static SerdStatus
-read_PLX(SerdReader* reader, Ref dest)
-{
- uint8_t c = peek_byte(reader);
- switch (c) {
- case '%':
- if (!read_PERCENT(reader, dest)) {
- return SERD_ERR_BAD_SYNTAX;
- }
- return SERD_SUCCESS;
- case '\\':
- eat_byte_safe(reader, c);
- if (is_alpha(c = peek_byte(reader))) {
- // Escapes like \u \n etc. are not supported
- return SERD_ERR_BAD_SYNTAX;
- }
- // Allow escaping of pretty much any other character
- push_byte(reader, dest, eat_byte_safe(reader, c));
- return SERD_SUCCESS;
- default:
- return SERD_FAILURE;
- }
-}
-
-static SerdStatus
-read_PN_LOCAL(SerdReader* reader, Ref dest, bool* ate_dot)
-{
- uint8_t c = peek_byte(reader);
- SerdStatus st = SERD_SUCCESS;
- switch (c) {
- case '0': case '1': case '2': case '3': case '4': case '5':
- case '6': case '7': case '8': case '9': case ':': case '_':
- push_byte(reader, dest, eat_byte_safe(reader, c));
- break;
- default:
- if ((st = read_PLX(reader, dest)) > SERD_FAILURE) {
- return st;
- } else if (st != SERD_SUCCESS && read_PN_CHARS_BASE(reader, dest)) {
- return SERD_FAILURE;
- }
- }
-
- while ((c = peek_byte(reader))) { // Middle: (PN_CHARS | '.' | ';')*
- if (c == '.' || c == ':') {
- push_byte(reader, dest, eat_byte_safe(reader, c));
- } else if ((st = read_PLX(reader, dest)) > SERD_FAILURE) {
- return st;
- } else if (st != SERD_SUCCESS && (st = read_PN_CHARS(reader, dest))) {
- break;
- }
- }
-
- SerdNode* const n = deref(reader, dest);
- if (n->buf[n->n_bytes - 1] == '.') {
- // Ate trailing dot, pop it from stack/node and inform caller
- --n->n_bytes;
- serd_stack_pop(&reader->stack, 1);
- *ate_dot = true;
- }
-
- return (st > SERD_FAILURE) ? st : SERD_SUCCESS;
-}
-
-// Read the remainder of a PN_PREFIX after some initial characters
-static SerdStatus
-read_PN_PREFIX_tail(SerdReader* reader, Ref dest)
-{
- uint8_t c;
- while ((c = peek_byte(reader))) { // Middle: (PN_CHARS | '.')*
- if (c == '.') {
- push_byte(reader, dest, eat_byte_safe(reader, c));
- } else if (read_PN_CHARS(reader, dest)) {
- break;
- }
- }
-
- const SerdNode* const n = deref(reader, dest);
- if (n->buf[n->n_bytes - 1] == '.' && read_PN_CHARS(reader, dest)) {
- r_err(reader, SERD_ERR_BAD_SYNTAX, "prefix ends with `.'\n");
- return SERD_ERR_BAD_SYNTAX;
- }
-
- return SERD_SUCCESS;
-}
-
-static SerdStatus
-read_PN_PREFIX(SerdReader* reader, Ref dest)
-{
- if (!read_PN_CHARS_BASE(reader, dest)) {
- return read_PN_PREFIX_tail(reader, dest);
- }
- return SERD_FAILURE;
-}
-
-static Ref
-read_LANGTAG(SerdReader* reader)
-{
- uint8_t c = peek_byte(reader);
- if (!is_alpha(c)) {
- return r_err(reader, SERD_ERR_BAD_SYNTAX, "unexpected `%c'\n", c);
- }
- Ref ref = push_node(reader, SERD_LITERAL, "", 0);
- push_byte(reader, ref, eat_byte_safe(reader, c));
- while ((c = peek_byte(reader)) && is_alpha(c)) {
- push_byte(reader, ref, eat_byte_safe(reader, c));
- }
- while (peek_byte(reader) == '-') {
- push_byte(reader, ref, eat_byte_safe(reader, '-'));
- while ((c = peek_byte(reader)) && (is_alpha(c) || is_digit(c))) {
- push_byte(reader, ref, eat_byte_safe(reader, c));
- }
- }
- return ref;
-}
-
-static bool
-read_IRIREF_scheme(SerdReader* reader, Ref dest)
-{
- uint8_t c = peek_byte(reader);
- if (!isalpha(c)) {
- return r_err(reader, SERD_ERR_BAD_SYNTAX,
- "bad IRI scheme start `%c'\n", c);
- }
-
- while ((c = peek_byte(reader))) {
- if (c == '>') {
- return r_err(reader, SERD_ERR_BAD_SYNTAX, "missing IRI scheme\n");
- } else if (!is_uri_scheme_char(c)) {
- return r_err(reader, SERD_ERR_BAD_SYNTAX,
- "bad IRI scheme char `%X'\n", c);
- }
-
- push_byte(reader, dest, eat_byte_safe(reader, c));
- if (c == ':') {
- return true; // End of scheme
- }
- }
-
- return false;
-}
-
-static Ref
-read_IRIREF(SerdReader* reader)
-{
- TRY_RET(eat_byte_check(reader, '<'));
- Ref ref = push_node(reader, SERD_URI, "", 0);
- if (!fancy_syntax(reader) && !read_IRIREF_scheme(reader, ref)) {
- return pop_node(reader, ref);
- }
-
- uint32_t code = 0;
- while (!reader->status) {
- const uint8_t c = eat_byte_safe(reader, peek_byte(reader));
- switch (c) {
- case '"': case '<': case '^': case '`': case '{': case '|': case '}':
- r_err(reader, SERD_ERR_BAD_SYNTAX,
- "invalid IRI character `%c'\n", c);
- return pop_node(reader, ref);
- case '>':
- return ref;
- case '\\':
- if (!read_UCHAR(reader, ref, &code)) {
- r_err(reader, SERD_ERR_BAD_SYNTAX, "invalid IRI escape\n");
- return pop_node(reader, ref);
- }
- switch (code) {
- case 0: case ' ': case '<': case '>':
- r_err(reader, SERD_ERR_BAD_SYNTAX,
- "invalid escaped IRI character %X %c\n", code, code);
- return pop_node(reader, ref);
- }
- break;
- default:
- if (c <= 0x20) {
- if (isprint(c)) {
- r_err(reader, SERD_ERR_BAD_SYNTAX,
- "invalid IRI character `%c' (escape %%%02X)\n", c, c);
- } else {
- r_err(reader, SERD_ERR_BAD_SYNTAX,
- "invalid IRI character (escape %%%02X)\n", c, c);
- }
- if (reader->strict) {
- return pop_node(reader, ref);
- }
- reader->status = SERD_FAILURE;
- push_byte(reader, ref, c);
- } else if (!(c & 0x80)) {
- push_byte(reader, ref, c);
- } else if (read_utf8_character(reader, ref, c)) {
- if (reader->strict) {
- return pop_node(reader, ref);
- }
- reader->status = SERD_FAILURE;
- }
- }
- }
- return pop_node(reader, ref);
-}
-
-static bool
-read_PrefixedName(SerdReader* reader, Ref dest, bool read_prefix, bool* ate_dot)
-{
- if (read_prefix && read_PN_PREFIX(reader, dest) > SERD_FAILURE) {
- return false;
- } else if (peek_byte(reader) != ':') {
- return false;
- }
-
- push_byte(reader, dest, eat_byte_safe(reader, ':'));
- return read_PN_LOCAL(reader, dest, ate_dot) <= SERD_FAILURE;
-}
-
-static bool
-read_0_9(SerdReader* reader, Ref str, bool at_least_one)
-{
- unsigned count = 0;
- for (uint8_t c; is_digit((c = peek_byte(reader))); ++count) {
- push_byte(reader, str, eat_byte_safe(reader, c));
- }
- if (at_least_one && count == 0) {
- r_err(reader, SERD_ERR_BAD_SYNTAX, "expected digit\n");
- }
- return count;
-}
-
-static bool
-read_number(SerdReader* reader, Ref* dest, Ref* datatype, bool* ate_dot)
-{
- #define XSD_DECIMAL NS_XSD "decimal"
- #define XSD_DOUBLE NS_XSD "double"
- #define XSD_INTEGER NS_XSD "integer"
- Ref ref = push_node(reader, SERD_LITERAL, "", 0);
- uint8_t c = peek_byte(reader);
- bool has_decimal = false;
- if (c == '-' || c == '+') {
- push_byte(reader, ref, eat_byte_safe(reader, c));
- }
- if ((c = peek_byte(reader)) == '.') {
- has_decimal = true;
- // decimal case 2 (e.g. '.0' or `-.0' or `+.0')
- push_byte(reader, ref, eat_byte_safe(reader, c));
- TRY_THROW(read_0_9(reader, ref, true));
- } else {
- // all other cases ::= ( '-' | '+' ) [0-9]+ ( . )? ( [0-9]+ )? ...
- TRY_THROW(is_digit(c));
- read_0_9(reader, ref, true);
- if ((c = peek_byte(reader)) == '.') {
- has_decimal = true;
-
- // Annoyingly, dot can be end of statement, so tentatively eat
- eat_byte_safe(reader, c);
- c = peek_byte(reader);
- if (!is_digit(c) && c != 'e' && c != 'E') {
- *dest = ref;
- *ate_dot = true; // Force caller to deal with stupid grammar
- return true; // Next byte is not a number character, done
- }
-
- push_byte(reader, ref, '.');
- read_0_9(reader, ref, false);
- }
- }
- c = peek_byte(reader);
- if (c == 'e' || c == 'E') {
- // double
- push_byte(reader, ref, eat_byte_safe(reader, c));
- switch ((c = peek_byte(reader))) {
- case '+': case '-':
- push_byte(reader, ref, eat_byte_safe(reader, c));
- default: break;
- }
- TRY_THROW(read_0_9(reader, ref, true));
- *datatype = push_node(reader, SERD_URI,
- XSD_DOUBLE, sizeof(XSD_DOUBLE) - 1);
- } else if (has_decimal) {
- *datatype = push_node(reader, SERD_URI,
- XSD_DECIMAL, sizeof(XSD_DECIMAL) - 1);
- } else {
- *datatype = push_node(reader, SERD_URI,
- XSD_INTEGER, sizeof(XSD_INTEGER) - 1);
- }
- *dest = ref;
- return true;
-except:
- pop_node(reader, *datatype);
- pop_node(reader, ref);
- return r_err(reader, SERD_ERR_BAD_SYNTAX, "bad number syntax\n");
-}
-
-static bool
-read_iri(SerdReader* reader, Ref* dest, bool* ate_dot)
-{
- switch (peek_byte(reader)) {
- case '<':
- *dest = read_IRIREF(reader);
- return true;
- default:
- *dest = push_node(reader, SERD_CURIE, "", 0);
- return read_PrefixedName(reader, *dest, true, ate_dot);
- }
-}
-
-static bool
-read_literal(SerdReader* reader, Ref* dest,
- Ref* datatype, Ref* lang, SerdNodeFlags* flags, bool* ate_dot)
-{
- Ref str = read_String(reader, flags);
- if (!str) {
- return false;
- }
-
- switch (peek_byte(reader)) {
- case '@':
- eat_byte_safe(reader, '@');
- TRY_THROW(*lang = read_LANGTAG(reader));
- break;
- case '^':
- eat_byte_safe(reader, '^');
- eat_byte_check(reader, '^');
- TRY_THROW(read_iri(reader, datatype, ate_dot));
- break;
- }
- *dest = str;
- return true;
-except:
- *datatype = pop_node(reader, *datatype);
- *lang = pop_node(reader, *lang);
- pop_node(reader, str);
- return r_err(reader, SERD_ERR_BAD_SYNTAX, "bad literal syntax\n");
-}
-
-inline static bool
-is_token_end(uint8_t c)
-{
- switch (c) {
- case 0x9: case 0xA: case 0xD: case 0x20: case '\0':
- case '#': case '.': case ';': case '<':
- return true;
- default:
- return false;
- }
-}
-
-static bool
-read_verb(SerdReader* reader, Ref* dest)
-{
- if (peek_byte(reader) == '<') {
- return (*dest = read_IRIREF(reader));
- }
-
- /* Either a qname, or "a". Read the prefix first, and if it is in fact
- "a", produce that instead.
- */
- *dest = push_node(reader, SERD_CURIE, "", 0);
- SerdNode* node = deref(reader, *dest);
- const SerdStatus st = read_PN_PREFIX(reader, *dest);
- bool ate_dot = false;
- if (!st && node->n_bytes == 1 && node->buf[0] == 'a' &&
- is_token_end(peek_byte(reader))) {
- pop_node(reader, *dest);
- return (*dest = push_node(reader, SERD_URI, NS_RDF "type", 47));
- } else if (st > SERD_FAILURE ||
- !read_PrefixedName(reader, *dest, false, &ate_dot) ||
- ate_dot) {
- *dest = pop_node(reader, *dest);
- return r_err(reader, SERD_ERR_BAD_SYNTAX, "bad verb\n");
- }
-
- return true;
-}
-
-static Ref
-read_BLANK_NODE_LABEL(SerdReader* reader, bool* ate_dot)
-{
- eat_byte_safe(reader, '_');
- eat_byte_check(reader, ':');
- Ref ref = push_node(reader, SERD_BLANK,
- reader->bprefix ? (char*)reader->bprefix : "",
- reader->bprefix_len);
-
- uint8_t c = peek_byte(reader); // First: (PN_CHARS | '_' | [0-9])
- if (is_digit(c) || c == '_') {
- push_byte(reader, ref, eat_byte_safe(reader, c));
- } else if (read_PN_CHARS(reader, ref)) {
- r_err(reader, SERD_ERR_BAD_SYNTAX, "invalid name start character\n");
- return pop_node(reader, ref);
- }
-
- while ((c = peek_byte(reader))) { // Middle: (PN_CHARS | '.')*
- if (c == '.') {
- push_byte(reader, ref, eat_byte_safe(reader, c));
- } else if (read_PN_CHARS(reader, ref)) {
- break;
- }
- }
-
- SerdNode* n = deref(reader, ref);
- if (n->buf[n->n_bytes - 1] == '.' && read_PN_CHARS(reader, ref)) {
- // Ate trailing dot, pop it from stack/node and inform caller
- --n->n_bytes;
- serd_stack_pop(&reader->stack, 1);
- *ate_dot = true;
- }
-
- if (reader->syntax == SERD_TURTLE) {
- if (is_digit(n->buf[reader->bprefix_len + 1])) {
- if ((n->buf[reader->bprefix_len]) == 'b') {
- ((char*)n->buf)[reader->bprefix_len] = 'B'; // Prevent clash
- reader->seen_genid = true;
- } else if (reader->seen_genid &&
- n->buf[reader->bprefix_len] == 'B') {
- r_err(reader, SERD_ERR_ID_CLASH,
- "found both `b' and `B' blank IDs, prefix required\n");
- return pop_node(reader, ref);
- }
- }
- }
- return ref;
-}
-
-static void
-set_blank_id(SerdReader* reader, Ref ref, size_t buf_size)
-{
- SerdNode* node = deref(reader, ref);
- const char* prefix = reader->bprefix ? (const char*)reader->bprefix : "";
- node->n_bytes = node->n_chars = snprintf(
- (char*)node->buf, buf_size, "%sb%u", prefix, reader->next_id++);
-}
-
-static size_t
-genid_size(SerdReader* reader)
-{
- return reader->bprefix_len + 1 + 10 + 1; // + "b" + UINT32_MAX + \0
-}
-
-static Ref
-blank_id(SerdReader* reader)
-{
- Ref ref = push_node_padded(reader, genid_size(reader), SERD_BLANK, "", 0);
- set_blank_id(reader, ref, genid_size(reader));
- return ref;
-}
-
-static Ref
-read_blankName(SerdReader* reader)
-{
- eat_byte_safe(reader, '=');
- if (eat_byte_check(reader, '=') != '=') {
- return r_err(reader, SERD_ERR_BAD_SYNTAX, "expected `='\n");
- }
-
- Ref subject = 0;
- bool ate_dot = false;
- read_ws_star(reader);
- read_iri(reader, &subject, &ate_dot);
- return subject;
-}
-
-static bool
-read_anon(SerdReader* reader, ReadContext ctx, bool subject, Ref* dest)
-{
- const SerdStatementFlags old_flags = *ctx.flags;
- bool empty;
- eat_byte_safe(reader, '[');
- if ((empty = peek_delim(reader, ']'))) {
- *ctx.flags |= (subject) ? SERD_EMPTY_S : SERD_EMPTY_O;
- } else {
- *ctx.flags |= (subject) ? SERD_ANON_S_BEGIN : SERD_ANON_O_BEGIN;
- if (peek_delim(reader, '=')) {
- if (!(*dest = read_blankName(reader)) ||
- !eat_delim(reader, ';')) {
- return false;
- }
- }
- }
-
- if (!*dest) {
- *dest = blank_id(reader);
- }
- if (ctx.subject) {
- TRY_RET(emit_statement(reader, ctx, *dest, 0, 0));
- }
-
- ctx.subject = *dest;
- if (!empty) {
- *ctx.flags &= ~(SERD_LIST_CONT);
- if (!subject) {
- *ctx.flags |= SERD_ANON_CONT;
- }
- bool ate_dot_in_list = false;
- read_predicateObjectList(reader, ctx, &ate_dot_in_list);
- if (ate_dot_in_list) {
- return r_err(reader, SERD_ERR_BAD_SYNTAX, "`.' inside blank\n");
- }
- read_ws_star(reader);
- if (reader->end_sink) {
- reader->end_sink(reader->handle, deref(reader, *dest));
- }
- *ctx.flags = old_flags;
- }
- return (eat_byte_check(reader, ']') == ']');
-}
-
-/* If emit is true: recurses, calling statement_sink for every statement
- encountered, and leaves stack in original calling state (i.e. pops
- everything it pushes). */
-static bool
-read_object(SerdReader* reader, ReadContext* ctx, bool emit, bool* ate_dot)
-{
- static const char* const XSD_BOOLEAN = NS_XSD "boolean";
- static const size_t XSD_BOOLEAN_LEN = 40;
-
-#ifndef NDEBUG
- const size_t orig_stack_size = reader->stack.size;
-#endif
-
- bool ret = false;
- bool simple = (ctx->subject != 0);
- SerdNode* node = NULL;
- Ref o = 0;
- Ref datatype = 0;
- Ref lang = 0;
- uint32_t flags = 0;
- const uint8_t c = peek_byte(reader);
- if (!fancy_syntax(reader)) {
- switch (c) {
- case '"': case ':': case '<': case '_': break;
- default: return r_err(reader, SERD_ERR_BAD_SYNTAX,
- "expected: ':', '<', or '_'\n");
- }
- }
- switch (c) {
- case '\0': case ')':
- return r_err(reader, SERD_ERR_BAD_SYNTAX, "expected object\n");
- case '[':
- simple = false;
- TRY_THROW(ret = read_anon(reader, *ctx, false, &o));
- break;
- case '(':
- simple = false;
- TRY_THROW(ret = read_collection(reader, *ctx, &o));
- break;
- case '_':
- TRY_THROW(ret = (o = read_BLANK_NODE_LABEL(reader, ate_dot)));
- break;
- case '<': case ':':
- TRY_THROW(ret = read_iri(reader, &o, ate_dot));
- break;
- case '+': case '-': case '.': case '0': case '1': case '2': case '3':
- case '4': case '5': case '6': case '7': case '8': case '9':
- TRY_THROW(ret = read_number(reader, &o, &datatype, ate_dot));
- break;
- case '\"':
- case '\'':
- TRY_THROW(ret = read_literal(reader, &o, &datatype, &lang, &flags, ate_dot));
- break;
- default:
- /* Either a boolean literal, or a qname. Read the prefix first, and if
- it is in fact a "true" or "false" literal, produce that instead.
- */
- node = deref(reader, o = push_node(reader, SERD_CURIE, "", 0));
- while (!read_PN_CHARS_BASE(reader, o)) {}
- if ((node->n_bytes == 4 && !memcmp(node->buf, "true", 4)) ||
- (node->n_bytes == 5 && !memcmp(node->buf, "false", 5))) {
- node->type = SERD_LITERAL;
- datatype = push_node(
- reader, SERD_URI, XSD_BOOLEAN, XSD_BOOLEAN_LEN);
- ret = true;
- } else if (read_PN_PREFIX_tail(reader, o) > SERD_FAILURE) {
- ret = false;
- } else {
- if (!(ret = read_PrefixedName(reader, o, false, ate_dot))) {
- r_err(reader, SERD_ERR_BAD_SYNTAX, "expected prefixed name\n");
- }
- }
- }
-
- if (simple && o) {
- deref(reader, o)->flags = flags;
- }
-
- if (ret && emit && simple) {
- ret = emit_statement(reader, *ctx, o, datatype, lang);
- } else if (ret && !emit) {
- ctx->object = o;
- ctx->datatype = datatype;
- ctx->lang = lang;
- return true;
- }
-
-except:
- pop_node(reader, lang);
- pop_node(reader, datatype);
- pop_node(reader, o);
-#ifndef NDEBUG
- assert(reader->stack.size == orig_stack_size);
-#endif
- return ret;
-}
-
-static bool
-read_objectList(SerdReader* reader, ReadContext ctx, bool* ate_dot)
-{
- TRY_RET(read_object(reader, &ctx, true, ate_dot));
- if (!fancy_syntax(reader) && peek_delim(reader, ',')) {
- return r_err(reader, SERD_ERR_BAD_SYNTAX,
- "syntax does not support abbreviation\n");
- }
-
- while (!*ate_dot && eat_delim(reader, ',')) {
- TRY_RET(read_object(reader, &ctx, true, ate_dot));
- }
- return true;
-}
-
-static bool
-read_predicateObjectList(SerdReader* reader, ReadContext ctx, bool* ate_dot)
-{
- while (read_verb(reader, &ctx.predicate) &&
- read_ws_star(reader) &&
- read_objectList(reader, ctx, ate_dot)) {
- ctx.predicate = pop_node(reader, ctx.predicate);
- if (*ate_dot) {
- return true;
- }
-
- bool ate_semi = false;
- uint8_t c;
- do {
- read_ws_star(reader);
- switch (c = peek_byte(reader)) {
- case 0:
- return r_err(reader, SERD_ERR_BAD_SYNTAX,
- "unexpected end of file\n");
- case '.': case ']': case '}':
- return true;
- case ';':
- eat_byte_safe(reader, c);
- ate_semi = true;
- }
- } while (c == ';');
-
- if (!ate_semi) {
- return r_err(reader, SERD_ERR_BAD_SYNTAX, "missing ';' or '.'\n");
- }
- }
-
- return pop_node(reader, ctx.predicate);
-}
-
-static bool
-end_collection(SerdReader* reader, ReadContext ctx, Ref n1, Ref n2, bool ret)
-{
- pop_node(reader, n2);
- pop_node(reader, n1);
- *ctx.flags &= ~SERD_LIST_CONT;
- return ret && (eat_byte_safe(reader, ')') == ')');
-}
-
-static bool
-read_collection(SerdReader* reader, ReadContext ctx, Ref* dest)
-{
- eat_byte_safe(reader, '(');
- bool end = peek_delim(reader, ')');
- *dest = end ? reader->rdf_nil : blank_id(reader);
- if (ctx.subject) {
- // subject predicate _:head
- *ctx.flags |= (end ? 0 : SERD_LIST_O_BEGIN);
- TRY_RET(emit_statement(reader, ctx, *dest, 0, 0));
- *ctx.flags |= SERD_LIST_CONT;
- } else {
- *ctx.flags |= (end ? 0 : SERD_LIST_S_BEGIN);
- }
-
- if (end) {
- return end_collection(reader, ctx, 0, 0, true);
- }
-
- /* The order of node allocation here is necessarily not in stack order,
- so we create two nodes and recycle them throughout. */
- Ref n1 = push_node_padded(reader, genid_size(reader), SERD_BLANK, "", 0);
- Ref n2 = 0;
- Ref node = n1;
- Ref rest = 0;
-
- ctx.subject = *dest;
- while (!(end = peek_delim(reader, ')'))) {
- // _:node rdf:first object
- ctx.predicate = reader->rdf_first;
- bool ate_dot = false;
- if (!read_object(reader, &ctx, true, &ate_dot) || ate_dot) {
- return end_collection(reader, ctx, n1, n2, false);
- }
-
- if (!(end = peek_delim(reader, ')'))) {
- /* Give rest a new ID. Done as late as possible to ensure it is
- used and > IDs generated by read_object above. */
- if (!rest) {
- rest = n2 = blank_id(reader); // First pass, push
- } else {
- set_blank_id(reader, rest, genid_size(reader));
- }
- }
-
- // _:node rdf:rest _:rest
- *ctx.flags |= SERD_LIST_CONT;
- ctx.predicate = reader->rdf_rest;
- TRY_RET(emit_statement(reader, ctx,
- (end ? reader->rdf_nil : rest), 0, 0));
-
- ctx.subject = rest; // _:node = _:rest
- rest = node; // _:rest = (old)_:node
- node = ctx.subject; // invariant
- }
-
- return end_collection(reader, ctx, n1, n2, true);
-}
-
-static Ref
-read_subject(SerdReader* reader, ReadContext ctx, Ref* dest, char* s_type)
-{
- bool ate_dot = false;
- switch ((*s_type = peek_byte(reader))) {
- case '[':
- read_anon(reader, ctx, true, dest);
- break;
- case '(':
- read_collection(reader, ctx, dest);
- break;
- case '_':
- *dest = read_BLANK_NODE_LABEL(reader, &ate_dot);
- break;
- default:
- TRY_RET(read_iri(reader, dest, &ate_dot));
- }
- return ate_dot ? pop_node(reader, *dest) : *dest;
-}
-
-static Ref
-read_labelOrSubject(SerdReader* reader, ReadContext ctx)
-{
- Ref subject = 0;
- bool ate_dot = false;
- switch (peek_byte(reader)) {
- case '[':
- eat_byte_safe(reader, '[');
- read_ws_star(reader);
- TRY_RET(eat_byte_check(reader, ']'));
- return blank_id(reader);
- case '_':
- return read_BLANK_NODE_LABEL(reader, &ate_dot);
- default:
- read_iri(reader, &subject, &ate_dot);
- }
- return subject;
-}
-
-static bool
-read_triples(SerdReader* reader, ReadContext ctx, bool* ate_dot)
-{
- bool ret = false;
- if (ctx.subject) {
- read_ws_star(reader);
- switch (peek_byte(reader)) {
- case '.':
- *ate_dot = eat_byte_safe(reader, '.');
- return r_err(reader, SERD_ERR_BAD_SYNTAX, "syntax error\n");
- case '}':
- return false;
- }
- ret = read_predicateObjectList(reader, ctx, ate_dot);
- }
- ctx.subject = ctx.predicate = 0;
- return ret;
-}
-
-static bool
-read_base(SerdReader* reader, bool sparql, bool token)
-{
- if (token) {
- TRY_RET(eat_string(reader, "base", 4));
- }
-
- Ref uri;
- read_ws_star(reader);
- TRY_RET(uri = read_IRIREF(reader));
- if (reader->base_sink) {
- reader->base_sink(reader->handle, deref(reader, uri));
- }
- pop_node(reader, uri);
-
- read_ws_star(reader);
- if (!sparql) {
- return eat_byte_check(reader, '.');
- } else if (peek_byte(reader) == '.') {
- return r_err(reader, SERD_ERR_BAD_SYNTAX,
- "full stop after SPARQL BASE\n");
- }
- return true;
-}
-
-static bool
-read_prefixID(SerdReader* reader, bool sparql, bool token)
-{
- if (token) {
- TRY_RET(eat_string(reader, "prefix", 6));
- }
-
- read_ws_star(reader);
- bool ret = true;
- Ref name = push_node(reader, SERD_LITERAL, "", 0);
- if (read_PN_PREFIX(reader, name) > SERD_FAILURE) {
- return pop_node(reader, name);
- }
-
- if (eat_byte_check(reader, ':') != ':') {
- return pop_node(reader, name);
- }
-
- read_ws_star(reader);
- const Ref uri = read_IRIREF(reader);
- if (!uri) {
- pop_node(reader, name);
- return false;
- }
-
- if (reader->prefix_sink) {
- ret = !reader->prefix_sink(reader->handle,
- deref(reader, name),
- deref(reader, uri));
- }
- pop_node(reader, uri);
- pop_node(reader, name);
- if (!sparql) {
- read_ws_star(reader);
- return eat_byte_check(reader, '.');
- }
- return ret;
-}
-
-static bool
-read_directive(SerdReader* reader)
-{
- const bool sparql = peek_byte(reader) != '@';
- if (!sparql) {
- eat_byte_safe(reader, '@');
- switch (peek_byte(reader)) {
- case 'B': case 'P':
- return r_err(reader, SERD_ERR_BAD_SYNTAX,
- "uppercase directive\n");
- }
- }
-
- switch (peek_byte(reader)) {
- case 'B': case 'b': return read_base(reader, sparql, true);
- case 'P': case 'p': return read_prefixID(reader, sparql, true);
- default:
- return r_err(reader, SERD_ERR_BAD_SYNTAX, "invalid directive\n");
- }
-
- return true;
-}
-
-static bool
-read_wrappedGraph(SerdReader* reader, ReadContext* ctx)
-{
- bool ate_dot = false;
- char s_type = 0;
- TRY_RET(eat_byte_check(reader, '{'));
- read_ws_star(reader);
- while (peek_byte(reader) != '}') {
- ctx->subject = 0;
- Ref subj = read_subject(reader, *ctx, &ctx->subject, &s_type);
- if (!subj && ctx->subject) {
- return r_err(reader, SERD_ERR_BAD_SYNTAX, "bad subject\n");
- } else if (!subj) {
- return false;
- } else if (!read_triples(reader, *ctx, &ate_dot) && s_type != '[') {
- return r_err(reader, SERD_ERR_BAD_SYNTAX,
- "missing predicate object list\n");
- }
- pop_node(reader, subj);
- read_ws_star(reader);
- if (peek_byte(reader) == '.') {
- eat_byte_safe(reader, '.');
- }
- read_ws_star(reader);
- }
- return eat_byte_check(reader, '}');
-}
-
-static int
-tokcmp(SerdReader* reader, Ref ref, const char* tok, size_t n)
-{
- SerdNode* node = deref(reader, ref);
- if (!node || node->n_bytes != n) {
- return -1;
- }
- return serd_strncasecmp((const char*)node->buf, tok, n);
-}
-
-static bool
read_statement(SerdReader* reader)
{
- SerdStatementFlags flags = 0;
- ReadContext ctx = { 0, 0, 0, 0, 0, 0, &flags };
- Ref subj = 0;
- bool ate_dot = false;
- char s_type = 0;
- bool ret = true;
- read_ws_star(reader);
- switch (peek_byte(reader)) {
- case '\0':
- reader->source.eof = true;
- return reader->status <= SERD_FAILURE;
- case '@':
- if (!fancy_syntax(reader)) {
- return r_err(reader, SERD_ERR_BAD_SYNTAX,
- "syntax does not support directives\n");
- }
- TRY_RET(read_directive(reader));
- read_ws_star(reader);
- break;
- case '{':
- if (reader->syntax == SERD_TRIG) {
- TRY_RET(read_wrappedGraph(reader, &ctx));
- read_ws_star(reader);
- } else {
- return r_err(reader, SERD_ERR_BAD_SYNTAX,
- "syntax does not support graphs\n");
- }
- break;
- default:
- subj = read_subject(reader, ctx, &ctx.subject, &s_type);
- if (!tokcmp(reader, ctx.subject, "base", 4)) {
- ret = read_base(reader, true, false);
- } else if (!tokcmp(reader, ctx.subject, "prefix", 6)) {
- ret = read_prefixID(reader, true, false);
- } else if (!tokcmp(reader, ctx.subject, "graph", 5)) {
- read_ws_star(reader);
- TRY_RET((ctx.graph = read_labelOrSubject(reader, ctx)));
- read_ws_star(reader);
- TRY_RET(read_wrappedGraph(reader, &ctx));
- read_ws_star(reader);
- } else if (read_ws_star(reader) && peek_byte(reader) == '{') {
- if (s_type == '(' || (s_type == '[' && !*ctx.flags)) {
- return r_err(reader, SERD_ERR_BAD_SYNTAX,
- "invalid graph name\n");
- }
- ctx.graph = subj;
- ctx.subject = subj = 0;
- TRY_RET(read_wrappedGraph(reader, &ctx));
- read_ws_star(reader);
- } else if (!subj) {
- ret = r_err(reader, SERD_ERR_BAD_SYNTAX, "bad subject\n");
- } else if (!read_triples(reader, ctx, &ate_dot)) {
- ret = (s_type == '[');
- } else if (!ate_dot) {
- read_ws_star(reader);
- ret = (eat_byte_check(reader, '.') == '.');
- }
- pop_node(reader, subj);
- break;
- }
- return ret;
-}
-
-static void
-skip_until(SerdReader* reader, uint8_t byte)
-{
- for (uint8_t c = 0; (c = peek_byte(reader)) && c != byte;) {
- eat_byte_safe(reader, c);
- }
-}
-
-static bool
-read_turtleTrigDoc(SerdReader* reader)
-{
- while (!reader->source.eof) {
- if (!read_statement(reader)) {
- if (reader->strict) {
- return 0;
- }
- skip_until(reader, '\n');
- reader->status = SERD_SUCCESS;
- }
- }
- return reader->status <= SERD_FAILURE;
-}
-
-static bool
-read_nquadsDoc(SerdReader* reader)
-{
- while (!reader->source.eof) {
- SerdStatementFlags flags = 0;
- ReadContext ctx = { 0, 0, 0, 0, 0, 0, &flags };
- bool ate_dot = false;
- char s_type = false;
- read_ws_star(reader);
- if (peek_byte(reader) == '\0') {
- reader->source.eof = true;
- break;
- } else if (peek_byte(reader) == '@') {
- return r_err(reader, SERD_ERR_BAD_SYNTAX,
- "syntax does not support directives\n");
- }
-
- // subject predicate object
- if (!(ctx.subject = read_subject(reader, ctx, &ctx.subject, &s_type)) ||
- !read_ws_star(reader) ||
- !(ctx.predicate = read_IRIREF(reader)) ||
- !read_ws_star(reader) ||
- !read_object(reader, &ctx, false, &ate_dot)) {
- return false;
- }
-
- if (!ate_dot) { // graphLabel?
- TRY_RET(read_ws_star(reader));
- switch (peek_byte(reader)) {
- case '.':
- break;
- case '_':
- ctx.graph = read_BLANK_NODE_LABEL(reader, &ate_dot);
- break;
- default:
- if (!(ctx.graph = read_IRIREF(reader))) {
- return false;
- }
- }
-
- // Terminating '.'
- TRY_RET(read_ws_star(reader));
- eat_byte_check(reader, '.');
- }
-
- TRY_RET(emit_statement(reader, ctx, ctx.object, ctx.datatype, ctx.lang));
- pop_node(reader, ctx.graph);
- pop_node(reader, ctx.lang);
- pop_node(reader, ctx.datatype);
- pop_node(reader, ctx.object);
+ switch (reader->syntax) {
+ default: return read_n3_statement(reader);
}
- return reader->status <= SERD_FAILURE;
}
static bool
@@ -1851,10 +285,12 @@ serd_reader_read_file(SerdReader* reader,
static SerdStatus
skip_bom(SerdReader* me)
{
- if (peek_byte(me) == 0xEF) {
- eat_byte_safe(me, 0xEF);
- if (eat_byte_check(me, 0xBB) != 0xBB ||
- eat_byte_check(me, 0xBF) != 0xBF) {
+ if (serd_byte_source_peek(&me->source) == 0xEF) {
+ serd_byte_source_advance(&me->source);
+ if (serd_byte_source_peek(&me->source) != 0xBB ||
+ serd_byte_source_advance(&me->source) ||
+ serd_byte_source_peek(&me->source) != 0xBF ||
+ serd_byte_source_advance(&me->source)) {
r_err(me, SERD_ERR_BAD_SYNTAX, "corrupt byte order mark\n");
return SERD_ERR_BAD_SYNTAX;
}
generated by cgit v1.2.1 (git 2.18.0) at 2024-11-06 07:39:45 +0000