Rename generated language functions to e.g. tree_sitter_python

They used to be called e.g. `ts_language_python`. Now that there
are APIs that deal with the `TSLanguage` objects themselves, such
as `ts_language_symbol_count`, the old names were a little confusing.

spec/fixtures/external_scanners/extra_external_tokens.c

@@ -4,21 +4,21 @@ enum {
   COMMENT,
 };
 
-void *ts_language_extra_external_tokens_external_scanner_create() {
+void *tree_sitter_extra_external_tokens_external_scanner_create() {
   return NULL;
 }
 
-void ts_language_extra_external_tokens_external_scanner_reset(void *payload) {
+void tree_sitter_extra_external_tokens_external_scanner_reset(void *payload) {
 }
 
-bool ts_language_extra_external_tokens_external_scanner_serialize(void *payload, TSExternalTokenState state) {
+bool tree_sitter_extra_external_tokens_external_scanner_serialize(void *payload, TSExternalTokenState state) {
   return true;
 }
 
-void ts_language_extra_external_tokens_external_scanner_deserialize(void *payload, TSExternalTokenState state) {
+void tree_sitter_extra_external_tokens_external_scanner_deserialize(void *payload, TSExternalTokenState state) {
 }
 
-bool ts_language_extra_external_tokens_external_scanner_scan(
+bool tree_sitter_extra_external_tokens_external_scanner_scan(
   void *payload, TSLexer *lexer, const bool *whitelist) {
 
   while (lexer->lookahead == ' ') {
@@ -38,5 +38,5 @@ bool ts_language_extra_external_tokens_external_scanner_scan(
   return false;
 }
 
-void ts_language_extra_external_tokens_external_scanner_destroy(void *payload) {
+void tree_sitter_extra_external_tokens_external_scanner_destroy(void *payload) {
 }

spec/fixtures/external_scanners/percent_strings.c

@@ -13,7 +13,7 @@ typedef struct {
   uint32_t depth;
 } Scanner;
 
-void *ts_language_external_scanner_example_external_scanner_create() {
+void *tree_sitter_external_scanner_example_external_scanner_create() {
   Scanner *scanner = malloc(sizeof(Scanner));
   *scanner = (Scanner){
     .open_delimiter = 0,
@@ -23,7 +23,7 @@ void *ts_language_external_scanner_example_external_scanner_create() {
   return scanner;
 }
 
-bool ts_language_external_scanner_example_external_scanner_scan(
+bool tree_sitter_external_scanner_example_external_scanner_scan(
   void *payload, TSLexer *lexer, const bool *whitelist) {
   Scanner *scanner = payload;
 
@@ -103,16 +103,16 @@ bool ts_language_external_scanner_example_external_scanner_scan(
   return false;
 }
 
-void ts_language_external_scanner_example_external_scanner_reset(void *payload) {
+void tree_sitter_external_scanner_example_external_scanner_reset(void *payload) {
 }
 
-bool ts_language_external_scanner_example_external_scanner_serialize(void *payload, TSExternalTokenState state) {
+bool tree_sitter_external_scanner_example_external_scanner_serialize(void *payload, TSExternalTokenState state) {
   return true;
 }
 
-void ts_language_external_scanner_example_external_scanner_deserialize(void *payload, TSExternalTokenState state) {
+void tree_sitter_external_scanner_example_external_scanner_deserialize(void *payload, TSExternalTokenState state) {
 }
 
-void ts_language_external_scanner_example_external_scanner_destroy(void *payload) {
+void tree_sitter_external_scanner_example_external_scanner_destroy(void *payload) {
   free(payload);
 }

spec/fixtures/external_scanners/shared_external_tokens.c

@@ -6,21 +6,21 @@ enum {
   LINE_BREAK
 };
 
-void *ts_language_shared_external_tokens_external_scanner_create() {
+void *tree_sitter_shared_external_tokens_external_scanner_create() {
   return NULL;
 }
 
-void ts_language_shared_external_tokens_external_scanner_reset(void *payload) {
+void tree_sitter_shared_external_tokens_external_scanner_reset(void *payload) {
 }
 
-bool ts_language_shared_external_tokens_external_scanner_serialize(void *payload, TSExternalTokenState state) {
+bool tree_sitter_shared_external_tokens_external_scanner_serialize(void *payload, TSExternalTokenState state) {
   return true;
 }
 
-void ts_language_shared_external_tokens_external_scanner_deserialize(void *payload, TSExternalTokenState state) {
+void tree_sitter_shared_external_tokens_external_scanner_deserialize(void *payload, TSExternalTokenState state) {
 }
 
-bool ts_language_shared_external_tokens_external_scanner_scan(
+bool tree_sitter_shared_external_tokens_external_scanner_scan(
   void *payload, TSLexer *lexer, const bool *whitelist) {
 
   // If a line-break is a valid lookahead token, only skip spaces.
@@ -59,5 +59,5 @@ bool ts_language_shared_external_tokens_external_scanner_scan(
   return false;
 }
 
-void ts_language_shared_external_tokens_external_scanner_destroy(void *payload) {
+void tree_sitter_shared_external_tokens_external_scanner_destroy(void *payload) {
 }

spec/helpers/load_language.cc

@@ -73,7 +73,7 @@ const TSLanguage *load_language(const string &source_filename,
                                 const string &lib_filename,
                                 const string &language_name,
                                 string external_scanner_filename = "") {
-  string language_function_name = "ts_language_" + language_name;
+  string language_function_name = "tree_sitter_" + language_name;
   string header_dir = getenv("PWD") + string("/include");
   int source_mtime = get_modified_time(source_filename);
   int header_mtime = get_modified_time(header_dir + "/tree_sitter/parser.h");

src/compiler/generate_code/c_code.cc

@@ -355,7 +355,8 @@ class CCodeGenerator {
   }
 
   void add_parser_export() {
-    string external_scanner_name = "ts_language_" + name + "_external_scanner";
+    string language_function_name = "tree_sitter_" + name;
+    string external_scanner_name = language_function_name + "_external_scanner";
 
     if (!syntax_grammar.external_tokens.empty()) {
       line("void *" + external_scanner_name + "_create();");
@@ -367,7 +368,7 @@ class CCodeGenerator {
       line();
     }
 
-    line("const TSLanguage *ts_language_" + name + "() {");
+    line("const TSLanguage *" + language_function_name + "() {");
     indent([&]() {
       line("GET_LANGUAGE(");
       if (syntax_grammar.external_tokens.empty()) {