prettify format and comments in html scanner

[milahu]

link to original source
minimize line diffs

--- scanner.cc.orig
+++ scanner.cc
@@ -1,3 +1,5 @@
+// based on https://github.com/tree-sitter/tree-sitter-html
+
 #include <tree_sitter/parser.h>
 #include <algorithm>
 #include <vector>
@@ -12,6 +14,12 @@
 using std::string;
 
 enum TokenType {
+
+  // vue
+  TEXT_FRAGMENT,
+  INTERPOLATION_TEXT,
+  TEMPLATE_START_TAG_NAME,
+
   START_TAG_NAME,
   SCRIPT_START_TAG_NAME,
   STYLE_START_TAG_NAME,
@@ -189,6 +197,12 @@
     Tag tag = Tag::for_name(tag_name);
     tags.push_back(tag);
     switch (tag.type) {
+
+      // vue
+      case TEMPLATE:
+        lexer->result_symbol = TEMPLATE_START_TAG_NAME;
+        break;
+
       case SCRIPT:
         lexer->result_symbol = SCRIPT_START_TAG_NAME;
         break;

mark changes with // vue comments

[milahu]

today i learned:

externals in grammar.js
and
TokenType in src/tree_sitter_html/scanner.cc enum
must be manually kept in sync

section-3-creating-parsers.md#external-scanners

otherwise node names are confused

--- actual
+++ expected
@@ -1,27 +1,27 @@
 (component
-  (element              <template>
+  (template_element     <template>
     (start_tag          <template>
       (tag_name))       <template>
     (text)              whitespace
-    (template_element   <span>
+    (element            <span>
       (start_tag        <span>
         (tag_name))     <span>
       (text)            "Message: "
       (interpolation    { msg }
         (raw_text))     { msg }
       (end_tag          </span>
         (tag_name)))    </span>
     (text)              whitespace
-    (template_element   <span v-once>
+    (element            <span v-once>
       (start_tag        <span v-once>
         (tag_name)      <span v-once>
         (directive_attribute  <span v-once>
           (directive_name)))  <span v-once>
       (text)            "This will never change: "
       (interpolation    { msg }
         (raw_text))     { msg }
       (end_tag          </span>
         (tag_name)))    </span>
     (text)              whitespace
     (end_tag            </template>
       (tag_name))))     </template>