Engage!

1 files changed, 362 insertions, 0 deletions

diff --git a/vendor/github.com/mitjafelicijan/go-tree-sitter/html/scanner.c b/vendor/github.com/mitjafelicijan/go-tree-sitter/html/scanner.c
new file mode 100644
index 0000000..d14ba9b
--- /dev/null
+++ b/vendor/github.com/mitjafelicijan/go-tree-sitter/html/scanner.c
@@ -0,0 +1,362 @@
+#include "tag.h"
+#include "parser.h"
+
+#include <wctype.h>
+
+enum TokenType {
+    START_TAG_NAME,
+    SCRIPT_START_TAG_NAME,
+    STYLE_START_TAG_NAME,
+    END_TAG_NAME,
+    ERRONEOUS_END_TAG_NAME,
+    SELF_CLOSING_TAG_DELIMITER,
+    IMPLICIT_END_TAG,
+    RAW_TEXT,
+    COMMENT,
+};
+
+typedef struct {
+    Array(Tag) tags;
+} Scanner;
+
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+
+static inline void advance(TSLexer *lexer) { lexer->advance(lexer, false); }
+
+static inline void skip(TSLexer *lexer) { lexer->advance(lexer, true); }
+
+static unsigned serialize(Scanner *scanner, char *buffer) {
+    uint16_t tag_count = scanner->tags.size > UINT16_MAX ? UINT16_MAX : scanner->tags.size;
+    uint16_t serialized_tag_count = 0;
+
+    unsigned size = sizeof(tag_count);
+    memcpy(&buffer[size], &tag_count, sizeof(tag_count));
+    size += sizeof(tag_count);
+
+    for (; serialized_tag_count < tag_count; serialized_tag_count++) {
+        Tag tag = scanner->tags.contents[serialized_tag_count];
+        if (tag.type == CUSTOM) {
+            unsigned name_length = tag.custom_tag_name.size;
+            if (name_length > UINT8_MAX) {
+                name_length = UINT8_MAX;
+            }
+            if (size + 2 + name_length >= TREE_SITTER_SERIALIZATION_BUFFER_SIZE) {
+                break;
+            }
+            buffer[size++] = (char)tag.type;
+            buffer[size++] = (char)name_length;
+            strncpy(&buffer[size], tag.custom_tag_name.contents, name_length);
+            size += name_length;
+        } else {
+            if (size + 1 >= TREE_SITTER_SERIALIZATION_BUFFER_SIZE) {
+                break;
+            }
+            buffer[size++] = (char)tag.type;
+        }
+    }
+
+    memcpy(&buffer[0], &serialized_tag_count, sizeof(serialized_tag_count));
+    return size;
+}
+
+static void deserialize(Scanner *scanner, const char *buffer, unsigned length) {
+    for (unsigned i = 0; i < scanner->tags.size; i++) {
+        tag_free(&scanner->tags.contents[i]);
+    }
+    array_clear(&scanner->tags);
+
+    if (length > 0) {
+        unsigned size = 0;
+        uint16_t tag_count = 0;
+        uint16_t serialized_tag_count = 0;
+
+        memcpy(&serialized_tag_count, &buffer[size], sizeof(serialized_tag_count));
+        size += sizeof(serialized_tag_count);
+
+        memcpy(&tag_count, &buffer[size], sizeof(tag_count));
+        size += sizeof(tag_count);
+
+        array_reserve(&scanner->tags, tag_count);
+        if (tag_count > 0) {
+            unsigned iter = 0;
+            for (iter = 0; iter < serialized_tag_count; iter++) {
+                Tag tag = tag_new();
+                tag.type = (TagType)buffer[size++];
+                if (tag.type == CUSTOM) {
+                    uint16_t name_length = (uint8_t)buffer[size++];
+                    array_reserve(&tag.custom_tag_name, name_length);
+                    tag.custom_tag_name.size = name_length;
+                    memcpy(tag.custom_tag_name.contents, &buffer[size], name_length);
+                    size += name_length;
+                }
+                array_push(&scanner->tags, tag);
+            }
+            // add zero tags if we didn't read enough, this is because the
+            // buffer had no more room but we held more tags.
+            for (; iter < tag_count; iter++) {
+                array_push(&scanner->tags, tag_new());
+            }
+        }
+    }
+}
+
+static String scan_tag_name(TSLexer *lexer) {
+    String tag_name = array_new();
+    while (iswalnum(lexer->lookahead) || lexer->lookahead == '-' || lexer->lookahead == ':') {
+        array_push(&tag_name, towupper(lexer->lookahead));
+        advance(lexer);
+    }
+    return tag_name;
+}
+
+static bool scan_comment(TSLexer *lexer) {
+    if (lexer->lookahead != '-') {
+        return false;
+    }
+    advance(lexer);
+    if (lexer->lookahead != '-') {
+        return false;
+    }
+    advance(lexer);
+
+    unsigned dashes = 0;
+    while (lexer->lookahead) {
+        switch (lexer->lookahead) {
+            case '-':
+                ++dashes;
+                break;
+            case '>':
+                if (dashes >= 2) {
+                    lexer->result_symbol = COMMENT;
+                    advance(lexer);
+                    lexer->mark_end(lexer);
+                    return true;
+                }
+            default:
+                dashes = 0;
+        }
+        advance(lexer);
+    }
+    return false;
+}
+
+static bool scan_raw_text(Scanner *scanner, TSLexer *lexer) {
+    if (scanner->tags.size == 0) {
+        return false;
+    }
+
+    lexer->mark_end(lexer);
+
+    const char *end_delimiter = array_back(&scanner->tags)->type == SCRIPT ? "</SCRIPT" : "</STYLE";
+
+    unsigned delimiter_index = 0;
+    while (lexer->lookahead) {
+        if (towupper(lexer->lookahead) == end_delimiter[delimiter_index]) {
+            delimiter_index++;
+            if (delimiter_index == strlen(end_delimiter)) {
+                break;
+            }
+            advance(lexer);
+        } else {
+            delimiter_index = 0;
+            advance(lexer);
+            lexer->mark_end(lexer);
+        }
+    }
+
+    lexer->result_symbol = RAW_TEXT;
+    return true;
+}
+
+static void pop_tag(Scanner *scanner) {
+    Tag popped_tag = array_pop(&scanner->tags);
+    tag_free(&popped_tag);
+}
+
+static bool scan_implicit_end_tag(Scanner *scanner, TSLexer *lexer) {
+    Tag *parent = scanner->tags.size == 0 ? NULL : array_back(&scanner->tags);
+
+    bool is_closing_tag = false;
+    if (lexer->lookahead == '/') {
+        is_closing_tag = true;
+        advance(lexer);
+    } else {
+        if (parent && tag_is_void(parent)) {
+            pop_tag(scanner);
+            lexer->result_symbol = IMPLICIT_END_TAG;
+            return true;
+        }
+    }
+
+    String tag_name = scan_tag_name(lexer);
+    if (tag_name.size == 0 && !lexer->eof(lexer)) {
+        array_delete(&tag_name);
+        return false;
+    }
+
+    Tag next_tag = tag_for_name(tag_name);
+
+    if (is_closing_tag) {
+        // The tag correctly closes the topmost element on the stack
+        if (scanner->tags.size > 0 && tag_eq(array_back(&scanner->tags), &next_tag)) {
+            tag_free(&next_tag);
+            return false;
+        }
+
+        // Otherwise, dig deeper and queue implicit end tags (to be nice in
+        // the case of malformed HTML)
+        for (unsigned i = scanner->tags.size; i > 0; i--) {
+            if (scanner->tags.contents[i - 1].type == next_tag.type) {
+                pop_tag(scanner);
+                lexer->result_symbol = IMPLICIT_END_TAG;
+                tag_free(&next_tag);
+                return true;
+            }
+        }
+    } else if (
+        parent &&
+        (
+            !tag_can_contain(parent, &next_tag) ||
+            ((parent->type == HTML || parent->type == HEAD || parent->type == BODY) && lexer->eof(lexer))
+        )
+    ) {
+        pop_tag(scanner);
+        lexer->result_symbol = IMPLICIT_END_TAG;
+        tag_free(&next_tag);
+        return true;
+    }
+
+    tag_free(&next_tag);
+    return false;
+}
+
+static bool scan_start_tag_name(Scanner *scanner, TSLexer *lexer) {
+    String tag_name = scan_tag_name(lexer);
+    if (tag_name.size == 0) {
+        array_delete(&tag_name);
+        return false;
+    }
+
+    Tag tag = tag_for_name(tag_name);
+    array_push(&scanner->tags, tag);
+    switch (tag.type) {
+        case SCRIPT:
+            lexer->result_symbol = SCRIPT_START_TAG_NAME;
+            break;
+        case STYLE:
+            lexer->result_symbol = STYLE_START_TAG_NAME;
+            break;
+        default:
+            lexer->result_symbol = START_TAG_NAME;
+            break;
+    }
+    return true;
+}
+
+static bool scan_end_tag_name(Scanner *scanner, TSLexer *lexer) {
+    String tag_name = scan_tag_name(lexer);
+
+    if (tag_name.size == 0) {
+        array_delete(&tag_name);
+        return false;
+    }
+
+    Tag tag = tag_for_name(tag_name);
+    if (scanner->tags.size > 0 && tag_eq(array_back(&scanner->tags), &tag)) {
+        pop_tag(scanner);
+        lexer->result_symbol = END_TAG_NAME;
+    } else {
+        lexer->result_symbol = ERRONEOUS_END_TAG_NAME;
+    }
+
+    tag_free(&tag);
+    return true;
+}
+
+static bool scan_self_closing_tag_delimiter(Scanner *scanner, TSLexer *lexer) {
+    advance(lexer);
+    if (lexer->lookahead == '>') {
+        advance(lexer);
+        if (scanner->tags.size > 0) {
+            pop_tag(scanner);
+            lexer->result_symbol = SELF_CLOSING_TAG_DELIMITER;
+        }
+        return true;
+    }
+    return false;
+}
+
+static bool scan(Scanner *scanner, TSLexer *lexer, const bool *valid_symbols) {
+    if (valid_symbols[RAW_TEXT] && !valid_symbols[START_TAG_NAME] && !valid_symbols[END_TAG_NAME]) {
+        return scan_raw_text(scanner, lexer);
+    }
+
+    while (iswspace(lexer->lookahead)) {
+        skip(lexer);
+    }
+
+    switch (lexer->lookahead) {
+        case '<':
+            lexer->mark_end(lexer);
+            advance(lexer);
+
+            if (lexer->lookahead == '!') {
+                advance(lexer);
+                return scan_comment(lexer);
+            }
+
+            if (valid_symbols[IMPLICIT_END_TAG]) {
+                return scan_implicit_end_tag(scanner, lexer);
+            }
+            break;
+
+        case '\0':
+            if (valid_symbols[IMPLICIT_END_TAG]) {
+                return scan_implicit_end_tag(scanner, lexer);
+            }
+            break;
+
+        case '/':
+            if (valid_symbols[SELF_CLOSING_TAG_DELIMITER]) {
+                return scan_self_closing_tag_delimiter(scanner, lexer);
+            }
+            break;
+
+        default:
+            if ((valid_symbols[START_TAG_NAME] || valid_symbols[END_TAG_NAME]) && !valid_symbols[RAW_TEXT]) {
+                return valid_symbols[START_TAG_NAME] ? scan_start_tag_name(scanner, lexer)
+                                                     : scan_end_tag_name(scanner, lexer);
+            }
+    }
+
+    return false;
+}
+
+void *tree_sitter_html_external_scanner_create() {
+    Scanner *scanner = (Scanner *)ts_calloc(1, sizeof(Scanner));
+    return scanner;
+}
+
+bool tree_sitter_html_external_scanner_scan(void *payload, TSLexer *lexer, const bool *valid_symbols) {
+    Scanner *scanner = (Scanner *)payload;
+    return scan(scanner, lexer, valid_symbols);
+}
+
+unsigned tree_sitter_html_external_scanner_serialize(void *payload, char *buffer) {
+    Scanner *scanner = (Scanner *)payload;
+    return serialize(scanner, buffer);
+}
+
+void tree_sitter_html_external_scanner_deserialize(void *payload, const char *buffer, unsigned length) {
+    Scanner *scanner = (Scanner *)payload;
+    deserialize(scanner, buffer, length);
+}
+
+void tree_sitter_html_external_scanner_destroy(void *payload) {
+    Scanner *scanner = (Scanner *)payload;
+    for (unsigned i = 0; i < scanner->tags.size; i++) {
+        tag_free(&scanner->tags.contents[i]);
+    }
+    array_delete(&scanner->tags);
+    ts_free(scanner);
+}