Skip to content

feat: Add PEP 750 template string support #305

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Sep 11, 2025
Merged

feat: Add PEP 750 template string support #305

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
17 changes: 9 additions & 8 deletions src/scanner.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -85,7 +85,7 @@ static inline void set_end_character(Delimiter *delimiter, int32_t character) {
typedef struct {
Array(uint16_t) indents;
Array(Delimiter) delimiters;
bool inside_f_string;
bool inside_interpolated_string;
} Scanner;

static inline void advance(TSLexer *lexer) { lexer->advance(lexer, false); }
Expand Down Expand Up @@ -177,7 +177,7 @@ bool tree_sitter_python_external_scanner_scan(void *payload, TSLexer *lexer, con
lexer->mark_end(lexer);
array_pop(&scanner->delimiters);
lexer->result_symbol = STRING_END;
scanner->inside_f_string = false;
scanner->inside_interpolated_string = false;
}
return true;
}
Expand All @@ -195,7 +195,7 @@ bool tree_sitter_python_external_scanner_scan(void *payload, TSLexer *lexer, con
advance(lexer);
array_pop(&scanner->delimiters);
lexer->result_symbol = STRING_END;
scanner->inside_f_string = false;
scanner->inside_interpolated_string = false;
}
lexer->mark_end(lexer);
return true;
Expand Down Expand Up @@ -280,7 +280,7 @@ bool tree_sitter_python_external_scanner_scan(void *payload, TSLexer *lexer, con
if ((valid_symbols[DEDENT] ||
(!valid_symbols[NEWLINE] && !(valid_symbols[STRING_START] && next_tok_is_string_start) &&
!within_brackets)) &&
indent_length < current_indent_length && !scanner->inside_f_string &&
indent_length < current_indent_length && !scanner->inside_interpolated_string &&

// Wait to create a dedent token until we've consumed any
// comments
Expand All @@ -303,7 +303,8 @@ bool tree_sitter_python_external_scanner_scan(void *payload, TSLexer *lexer, con

bool has_flags = false;
while (lexer->lookahead) {
if (lexer->lookahead == 'f' || lexer->lookahead == 'F') {
if (lexer->lookahead == 'f' || lexer->lookahead == 'F' || lexer->lookahead == 't' ||
lexer->lookahead == 'T') {
set_format(&delimiter);
} else if (lexer->lookahead == 'r' || lexer->lookahead == 'R') {
set_raw(&delimiter);
Expand Down Expand Up @@ -349,7 +350,7 @@ bool tree_sitter_python_external_scanner_scan(void *payload, TSLexer *lexer, con
if (end_character(&delimiter)) {
array_push(&scanner->delimiters, delimiter);
lexer->result_symbol = STRING_START;
scanner->inside_f_string = is_format(&delimiter);
scanner->inside_interpolated_string = is_format(&delimiter);
return true;
}
if (has_flags) {
Expand All @@ -365,7 +366,7 @@ unsigned tree_sitter_python_external_scanner_serialize(void *payload, char *buff

size_t size = 0;

buffer[size++] = (char)scanner->inside_f_string;
buffer[size++] = (char)scanner->inside_interpolated_string;

size_t delimiter_count = scanner->delimiters.size;
if (delimiter_count > UINT8_MAX) {
Expand Down Expand Up @@ -398,7 +399,7 @@ void tree_sitter_python_external_scanner_deserialize(void *payload, const char *
if (length > 0) {
size_t size = 0;

scanner->inside_f_string = (bool)buffer[size++];
scanner->inside_interpolated_string = (bool)buffer[size++];

size_t delimiter_count = (uint8_t)buffer[size++];
if (delimiter_count > 0) {
Expand Down
73 changes: 73 additions & 0 deletions test/corpus/literals.txt
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -553,6 +553,79 @@ f"{value:{width + padding!r}.{precision}}"
(identifier))))
(string_end))))

================================================================================
Template Strings
================================================================================

t"Hello, {first_name} {last_name}!"
t"a {b:2} {c:34.5}"
tr"Path: {path}\n"
t"""
Multi-line template
with {variable}
"""
t"Use {{braces}} to escape"
t"Result: {a + b}"

--------------------------------------------------------------------------------

(module
(expression_statement
(string
(string_start)
(string_content)
(interpolation
(identifier))
(string_content)
(interpolation
(identifier))
(string_content)
(string_end)))
(expression_statement
(string
(string_start)
(string_content)
(interpolation
(identifier)
(format_specifier))
(string_content)
(interpolation
(identifier)
(format_specifier))
(string_end)))
(expression_statement
(string
(string_start)
(string_content)
(interpolation
(identifier))
(string_content)
(string_end)))
(expression_statement
(string
(string_start)
(string_content)
(interpolation
(identifier))
(string_content)
(string_end)))
(expression_statement
(string
(string_start)
(string_content
(escape_interpolation)
(escape_interpolation))
(string_end)))
(expression_statement
(string
(string_start)
(string_content)
(interpolation
(binary_operator
(identifier)
(identifier)))
(string_end))))

================================================================================
Unicode escape sequences
================================================================================
Expand Down
Loading