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godot/modules/gdscript/gdscript_tokenizer.cpp
George Marques 72e5f8c31e
GDScript: Enable compression on export 
Besides the regular option to export GDScript as binary tokens, this
also includes a compression option on top of it. The binary format
needs to encode some information which generally makes it bigger than
the source text. This option reduces that difference by using Zstandard
compression on the buffer.
2024-02-08 11:20:07 -03:00

1689 lines
46 KiB
C++
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/**************************************************************************/
/* gdscript_tokenizer.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
#include "gdscript_tokenizer.h"
#include "core/error/error_macros.h"
#include "core/string/char_utils.h"
#ifdef DEBUG_ENABLED
#include "servers/text_server.h"
#endif
#ifdef TOOLS_ENABLED
#include "editor/editor_settings.h"
#endif
static const char *token_names[] = {
"Empty", // EMPTY,
// Basic
"Annotation", // ANNOTATION
"Identifier", // IDENTIFIER,
"Literal", // LITERAL,
// Comparison
"<", // LESS,
"<=", // LESS_EQUAL,
">", // GREATER,
">=", // GREATER_EQUAL,
"==", // EQUAL_EQUAL,
"!=", // BANG_EQUAL,
// Logical
"and", // AND,
"or", // OR,
"not", // NOT,
"&&", // AMPERSAND_AMPERSAND,
"||", // PIPE_PIPE,
"!", // BANG,
// Bitwise
"&", // AMPERSAND,
"|", // PIPE,
"~", // TILDE,
"^", // CARET,
"<<", // LESS_LESS,
">>", // GREATER_GREATER,
// Math
"+", // PLUS,
"-", // MINUS,
"*", // STAR,
"**", // STAR_STAR,
"/", // SLASH,
"%", // PERCENT,
// Assignment
"=", // EQUAL,
"+=", // PLUS_EQUAL,
"-=", // MINUS_EQUAL,
"*=", // STAR_EQUAL,
"**=", // STAR_STAR_EQUAL,
"/=", // SLASH_EQUAL,
"%=", // PERCENT_EQUAL,
"<<=", // LESS_LESS_EQUAL,
">>=", // GREATER_GREATER_EQUAL,
"&=", // AMPERSAND_EQUAL,
"|=", // PIPE_EQUAL,
"^=", // CARET_EQUAL,
// Control flow
"if", // IF,
"elif", // ELIF,
"else", // ELSE,
"for", // FOR,
"while", // WHILE,
"break", // BREAK,
"continue", // CONTINUE,
"pass", // PASS,
"return", // RETURN,
"match", // MATCH,
"when", // WHEN,
// Keywords
"as", // AS,
"assert", // ASSERT,
"await", // AWAIT,
"breakpoint", // BREAKPOINT,
"class", // CLASS,
"class_name", // CLASS_NAME,
"const", // CONST,
"enum", // ENUM,
"extends", // EXTENDS,
"func", // FUNC,
"in", // IN,
"is", // IS,
"namespace", // NAMESPACE
"preload", // PRELOAD,
"self", // SELF,
"signal", // SIGNAL,
"static", // STATIC,
"super", // SUPER,
"trait", // TRAIT,
"var", // VAR,
"void", // VOID,
"yield", // YIELD,
// Punctuation
"[", // BRACKET_OPEN,
"]", // BRACKET_CLOSE,
"{", // BRACE_OPEN,
"}", // BRACE_CLOSE,
"(", // PARENTHESIS_OPEN,
")", // PARENTHESIS_CLOSE,
",", // COMMA,
";", // SEMICOLON,
".", // PERIOD,
"..", // PERIOD_PERIOD,
":", // COLON,
"$", // DOLLAR,
"->", // FORWARD_ARROW,
"_", // UNDERSCORE,
// Whitespace
"Newline", // NEWLINE,
"Indent", // INDENT,
"Dedent", // DEDENT,
// Constants
"PI", // CONST_PI,
"TAU", // CONST_TAU,
"INF", // CONST_INF,
"NaN", // CONST_NAN,
// Error message improvement
"VCS conflict marker", // VCS_CONFLICT_MARKER,
"`", // BACKTICK,
"?", // QUESTION_MARK,
// Special
"Error", // ERROR,
"End of file", // EOF,
};
// Avoid desync.
static_assert(sizeof(token_names) / sizeof(token_names[0]) == GDScriptTokenizer::Token::TK_MAX, "Amount of token names don't match the amount of token types.");
const char *GDScriptTokenizer::Token::get_name() const {
ERR_FAIL_INDEX_V_MSG(type, TK_MAX, "<error>", "Using token type out of the enum.");
return token_names[type];
}
bool GDScriptTokenizer::Token::can_precede_bin_op() const {
switch (type) {
case IDENTIFIER:
case LITERAL:
case SELF:
case BRACKET_CLOSE:
case BRACE_CLOSE:
case PARENTHESIS_CLOSE:
case CONST_PI:
case CONST_TAU:
case CONST_INF:
case CONST_NAN:
return true;
default:
return false;
}
}
bool GDScriptTokenizer::Token::is_identifier() const {
// Note: Most keywords should not be recognized as identifiers.
// These are only exceptions for stuff that already is on the engine's API.
switch (type) {
case IDENTIFIER:
case MATCH: // Used in String.match().
case WHEN: // New keyword, avoid breaking existing code.
// Allow constants to be treated as regular identifiers.
case CONST_PI:
case CONST_INF:
case CONST_NAN:
case CONST_TAU:
return true;
default:
return false;
}
}
bool GDScriptTokenizer::Token::is_node_name() const {
// This is meant to allow keywords with the $ notation, but not as general identifiers.
switch (type) {
case IDENTIFIER:
case AND:
case AS:
case ASSERT:
case AWAIT:
case BREAK:
case BREAKPOINT:
case CLASS_NAME:
case CLASS:
case CONST:
case CONST_PI:
case CONST_INF:
case CONST_NAN:
case CONST_TAU:
case CONTINUE:
case ELIF:
case ELSE:
case ENUM:
case EXTENDS:
case FOR:
case FUNC:
case IF:
case IN:
case IS:
case MATCH:
case NAMESPACE:
case NOT:
case OR:
case PASS:
case PRELOAD:
case RETURN:
case SELF:
case SIGNAL:
case STATIC:
case SUPER:
case TRAIT:
case UNDERSCORE:
case VAR:
case VOID:
case WHILE:
case WHEN:
case YIELD:
return true;
default:
return false;
}
}
String GDScriptTokenizer::get_token_name(Token::Type p_token_type) {
ERR_FAIL_INDEX_V_MSG(p_token_type, Token::TK_MAX, "<error>", "Using token type out of the enum.");
return token_names[p_token_type];
}
void GDScriptTokenizerText::set_source_code(const String &p_source_code) {
source = p_source_code;
if (source.is_empty()) {
_source = U"";
} else {
_source = source.ptr();
}
_current = _source;
line = 1;
column = 1;
length = p_source_code.length();
position = 0;
}
void GDScriptTokenizerText::set_cursor_position(int p_line, int p_column) {
cursor_line = p_line;
cursor_column = p_column;
}
void GDScriptTokenizerText::set_multiline_mode(bool p_state) {
multiline_mode = p_state;
}
void GDScriptTokenizerText::push_expression_indented_block() {
indent_stack_stack.push_back(indent_stack);
}
void GDScriptTokenizerText::pop_expression_indented_block() {
ERR_FAIL_COND(indent_stack_stack.is_empty());
indent_stack = indent_stack_stack.back()->get();
indent_stack_stack.pop_back();
}
int GDScriptTokenizerText::get_cursor_line() const {
return cursor_line;
}
int GDScriptTokenizerText::get_cursor_column() const {
return cursor_column;
}
bool GDScriptTokenizerText::is_past_cursor() const {
if (line < cursor_line) {
return false;
}
if (line > cursor_line) {
return true;
}
if (column < cursor_column) {
return false;
}
return true;
}
char32_t GDScriptTokenizerText::_advance() {
if (unlikely(_is_at_end())) {
return '\0';
}
_current++;
column++;
position++;
if (column > rightmost_column) {
rightmost_column = column;
}
if (unlikely(_is_at_end())) {
// Add extra newline even if it's not there, to satisfy the parser.
newline(true);
// Also add needed unindent.
check_indent();
}
return _peek(-1);
}
void GDScriptTokenizerText::push_paren(char32_t p_char) {
paren_stack.push_back(p_char);
}
bool GDScriptTokenizerText::pop_paren(char32_t p_expected) {
if (paren_stack.is_empty()) {
return false;
}
char32_t actual = paren_stack.back()->get();
paren_stack.pop_back();
return actual == p_expected;
}
GDScriptTokenizer::Token GDScriptTokenizerText::pop_error() {
Token error = error_stack.back()->get();
error_stack.pop_back();
return error;
}
GDScriptTokenizer::Token GDScriptTokenizerText::make_token(Token::Type p_type) {
Token token(p_type);
token.start_line = start_line;
token.end_line = line;
token.start_column = start_column;
token.end_column = column;
token.leftmost_column = leftmost_column;
token.rightmost_column = rightmost_column;
token.source = String(_start, _current - _start);
if (p_type != Token::ERROR && cursor_line > -1) {
// Also count whitespace after token.
int offset = 0;
while (_peek(offset) == ' ' || _peek(offset) == '\t') {
offset++;
}
int last_column = column + offset;
// Check cursor position in token.
if (start_line == line) {
// Single line token.
if (cursor_line == start_line && cursor_column >= start_column && cursor_column <= last_column) {
token.cursor_position = cursor_column - start_column;
if (cursor_column == start_column) {
token.cursor_place = CURSOR_BEGINNING;
} else if (cursor_column < column) {
token.cursor_place = CURSOR_MIDDLE;
} else {
token.cursor_place = CURSOR_END;
}
}
} else {
// Multi line token.
if (cursor_line == start_line && cursor_column >= start_column) {
// Is in first line.
token.cursor_position = cursor_column - start_column;
if (cursor_column == start_column) {
token.cursor_place = CURSOR_BEGINNING;
} else {
token.cursor_place = CURSOR_MIDDLE;
}
} else if (cursor_line == line && cursor_column <= last_column) {
// Is in last line.
token.cursor_position = cursor_column - start_column;
if (cursor_column < column) {
token.cursor_place = CURSOR_MIDDLE;
} else {
token.cursor_place = CURSOR_END;
}
} else if (cursor_line > start_line && cursor_line < line) {
// Is in middle line.
token.cursor_position = CURSOR_MIDDLE;
}
}
}
last_token = token;
return token;
}
GDScriptTokenizer::Token GDScriptTokenizerText::make_literal(const Variant &p_literal) {
Token token = make_token(Token::LITERAL);
token.literal = p_literal;
return token;
}
GDScriptTokenizer::Token GDScriptTokenizerText::make_identifier(const StringName &p_identifier) {
Token identifier = make_token(Token::IDENTIFIER);
identifier.literal = p_identifier;
return identifier;
}
GDScriptTokenizer::Token GDScriptTokenizerText::make_error(const String &p_message) {
Token error = make_token(Token::ERROR);
error.literal = p_message;
return error;
}
void GDScriptTokenizerText::push_error(const String &p_message) {
Token error = make_error(p_message);
error_stack.push_back(error);
}
void GDScriptTokenizerText::push_error(const Token &p_error) {
error_stack.push_back(p_error);
}
GDScriptTokenizer::Token GDScriptTokenizerText::make_paren_error(char32_t p_paren) {
if (paren_stack.is_empty()) {
return make_error(vformat("Closing \"%c\" doesn't have an opening counterpart.", p_paren));
}
Token error = make_error(vformat("Closing \"%c\" doesn't match the opening \"%c\".", p_paren, paren_stack.back()->get()));
paren_stack.pop_back(); // Remove opening one anyway.
return error;
}
GDScriptTokenizer::Token GDScriptTokenizerText::check_vcs_marker(char32_t p_test, Token::Type p_double_type) {
const char32_t *next = _current + 1;
int chars = 2; // Two already matched.
// Test before consuming characters, since we don't want to consume more than needed.
while (*next == p_test) {
chars++;
next++;
}
if (chars >= 7) {
// It is a VCS conflict marker.
while (chars > 1) {
// Consume all characters (first was already consumed by scan()).
_advance();
chars--;
}
return make_token(Token::VCS_CONFLICT_MARKER);
} else {
// It is only a regular double character token, so we consume the second character.
_advance();
return make_token(p_double_type);
}
}
GDScriptTokenizer::Token GDScriptTokenizerText::annotation() {
if (is_unicode_identifier_start(_peek())) {
_advance(); // Consume start character.
} else {
push_error("Expected annotation identifier after \"@\".");
}
while (is_unicode_identifier_continue(_peek())) {
// Consume all identifier characters.
_advance();
}
Token annotation = make_token(Token::ANNOTATION);
annotation.literal = StringName(annotation.source);
return annotation;
}
#define KEYWORDS(KEYWORD_GROUP, KEYWORD) \
KEYWORD_GROUP('a') \
KEYWORD("as", Token::AS) \
KEYWORD("and", Token::AND) \
KEYWORD("assert", Token::ASSERT) \
KEYWORD("await", Token::AWAIT) \
KEYWORD_GROUP('b') \
KEYWORD("break", Token::BREAK) \
KEYWORD("breakpoint", Token::BREAKPOINT) \
KEYWORD_GROUP('c') \
KEYWORD("class", Token::CLASS) \
KEYWORD("class_name", Token::CLASS_NAME) \
KEYWORD("const", Token::CONST) \
KEYWORD("continue", Token::CONTINUE) \
KEYWORD_GROUP('e') \
KEYWORD("elif", Token::ELIF) \
KEYWORD("else", Token::ELSE) \
KEYWORD("enum", Token::ENUM) \
KEYWORD("extends", Token::EXTENDS) \
KEYWORD_GROUP('f') \
KEYWORD("for", Token::FOR) \
KEYWORD("func", Token::FUNC) \
KEYWORD_GROUP('i') \
KEYWORD("if", Token::IF) \
KEYWORD("in", Token::IN) \
KEYWORD("is", Token::IS) \
KEYWORD_GROUP('m') \
KEYWORD("match", Token::MATCH) \
KEYWORD_GROUP('n') \
KEYWORD("namespace", Token::NAMESPACE) \
KEYWORD("not", Token::NOT) \
KEYWORD_GROUP('o') \
KEYWORD("or", Token::OR) \
KEYWORD_GROUP('p') \
KEYWORD("pass", Token::PASS) \
KEYWORD("preload", Token::PRELOAD) \
KEYWORD_GROUP('r') \
KEYWORD("return", Token::RETURN) \
KEYWORD_GROUP('s') \
KEYWORD("self", Token::SELF) \
KEYWORD("signal", Token::SIGNAL) \
KEYWORD("static", Token::STATIC) \
KEYWORD("super", Token::SUPER) \
KEYWORD_GROUP('t') \
KEYWORD("trait", Token::TRAIT) \
KEYWORD_GROUP('v') \
KEYWORD("var", Token::VAR) \
KEYWORD("void", Token::VOID) \
KEYWORD_GROUP('w') \
KEYWORD("while", Token::WHILE) \
KEYWORD("when", Token::WHEN) \
KEYWORD_GROUP('y') \
KEYWORD("yield", Token::YIELD) \
KEYWORD_GROUP('I') \
KEYWORD("INF", Token::CONST_INF) \
KEYWORD_GROUP('N') \
KEYWORD("NAN", Token::CONST_NAN) \
KEYWORD_GROUP('P') \
KEYWORD("PI", Token::CONST_PI) \
KEYWORD_GROUP('T') \
KEYWORD("TAU", Token::CONST_TAU)
#define MIN_KEYWORD_LENGTH 2
#define MAX_KEYWORD_LENGTH 10
#ifdef DEBUG_ENABLED
void GDScriptTokenizerText::make_keyword_list() {
#define KEYWORD_LINE(keyword, token_type) keyword,
#define KEYWORD_GROUP_IGNORE(group)
keyword_list = {
KEYWORDS(KEYWORD_GROUP_IGNORE, KEYWORD_LINE)
};
#undef KEYWORD_LINE
#undef KEYWORD_GROUP_IGNORE
}
#endif // DEBUG_ENABLED
GDScriptTokenizer::Token GDScriptTokenizerText::potential_identifier() {
bool only_ascii = _peek(-1) < 128;
// Consume all identifier characters.
while (is_unicode_identifier_continue(_peek())) {
char32_t c = _advance();
only_ascii = only_ascii && c < 128;
}
int len = _current - _start;
if (len == 1 && _peek(-1) == '_') {
// Lone underscore.
return make_token(Token::UNDERSCORE);
}
String name(_start, len);
if (len < MIN_KEYWORD_LENGTH || len > MAX_KEYWORD_LENGTH) {
// Cannot be a keyword, as the length doesn't match any.
return make_identifier(name);
}
if (!only_ascii) {
// Kept here in case the order with push_error matters.
Token id = make_identifier(name);
#ifdef DEBUG_ENABLED
// Additional checks for identifiers but only in debug and if it's available in TextServer.
if (TS->has_feature(TextServer::FEATURE_UNICODE_SECURITY)) {
int64_t confusable = TS->is_confusable(name, keyword_list);
if (confusable >= 0) {
push_error(vformat(R"(Identifier "%s" is visually similar to the GDScript keyword "%s" and thus not allowed.)", name, keyword_list[confusable]));
}
}
#endif // DEBUG_ENABLED
// Cannot be a keyword, as keywords are ASCII only.
return id;
}
// Define some helper macros for the switch case.
#define KEYWORD_GROUP_CASE(char) \
break; \
case char:
#define KEYWORD(keyword, token_type) \
{ \
const int keyword_length = sizeof(keyword) - 1; \
static_assert(keyword_length <= MAX_KEYWORD_LENGTH, "There's a keyword longer than the defined maximum length"); \
static_assert(keyword_length >= MIN_KEYWORD_LENGTH, "There's a keyword shorter than the defined minimum length"); \
if (keyword_length == len && name == keyword) { \
Token kw = make_token(token_type); \
kw.literal = name; \
return kw; \
} \
}
// Find if it's a keyword.
switch (_start[0]) {
default:
KEYWORDS(KEYWORD_GROUP_CASE, KEYWORD)
break;
}
// Check if it's a special literal
if (len == 4) {
if (name == "true") {
return make_literal(true);
} else if (name == "null") {
return make_literal(Variant());
}
} else if (len == 5) {
if (name == "false") {
return make_literal(false);
}
}
// Not a keyword, so must be an identifier.
return make_identifier(name);
#undef KEYWORD_GROUP_CASE
#undef KEYWORD
}
#undef MAX_KEYWORD_LENGTH
#undef MIN_KEYWORD_LENGTH
#undef KEYWORDS
void GDScriptTokenizerText::newline(bool p_make_token) {
// Don't overwrite previous newline, nor create if we want a line continuation.
if (p_make_token && !pending_newline && !line_continuation) {
Token newline(Token::NEWLINE);
newline.start_line = line;
newline.end_line = line;
newline.start_column = column - 1;
newline.end_column = column;
newline.leftmost_column = newline.start_column;
newline.rightmost_column = newline.end_column;
pending_newline = true;
last_token = newline;
last_newline = newline;
}
// Increment line/column counters.
line++;
column = 1;
leftmost_column = 1;
}
GDScriptTokenizer::Token GDScriptTokenizerText::number() {
int base = 10;
bool has_decimal = false;
bool has_exponent = false;
bool has_error = false;
bool need_digits = false;
bool (*digit_check_func)(char32_t) = is_digit;
// Sign before hexadecimal or binary.
if ((_peek(-1) == '+' || _peek(-1) == '-') && _peek() == '0') {
_advance();
}
if (_peek(-1) == '.') {
has_decimal = true;
} else if (_peek(-1) == '0') {
if (_peek() == 'x') {
// Hexadecimal.
base = 16;
digit_check_func = is_hex_digit;
need_digits = true;
_advance();
} else if (_peek() == 'b') {
// Binary.
base = 2;
digit_check_func = is_binary_digit;
need_digits = true;
_advance();
}
}
if (base != 10 && is_underscore(_peek())) { // Disallow `0x_` and `0b_`.
Token error = make_error(vformat(R"(Unexpected underscore after "0%c".)", _peek(-1)));
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
has_error = true;
}
bool previous_was_underscore = false; // Allow `_` to be used in a number, for readability.
while (digit_check_func(_peek()) || is_underscore(_peek())) {
if (is_underscore(_peek())) {
if (previous_was_underscore) {
Token error = make_error(R"(Multiple underscores cannot be adjacent in a numeric literal.)");
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
}
previous_was_underscore = true;
} else {
need_digits = false;
previous_was_underscore = false;
}
_advance();
}
// It might be a ".." token (instead of decimal point) so we check if it's not.
if (_peek() == '.' && _peek(1) != '.') {
if (base == 10 && !has_decimal) {
has_decimal = true;
} else if (base == 10) {
Token error = make_error("Cannot use a decimal point twice in a number.");
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
has_error = true;
} else if (base == 16) {
Token error = make_error("Cannot use a decimal point in a hexadecimal number.");
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
has_error = true;
} else {
Token error = make_error("Cannot use a decimal point in a binary number.");
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
has_error = true;
}
if (!has_error) {
_advance();
// Consume decimal digits.
if (is_underscore(_peek())) { // Disallow `10._`, but allow `10.`.
Token error = make_error(R"(Unexpected underscore after decimal point.)");
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
has_error = true;
}
previous_was_underscore = false;
while (is_digit(_peek()) || is_underscore(_peek())) {
if (is_underscore(_peek())) {
if (previous_was_underscore) {
Token error = make_error(R"(Multiple underscores cannot be adjacent in a numeric literal.)");
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
}
previous_was_underscore = true;
} else {
previous_was_underscore = false;
}
_advance();
}
}
}
if (base == 10) {
if (_peek() == 'e' || _peek() == 'E') {
has_exponent = true;
_advance();
if (_peek() == '+' || _peek() == '-') {
// Exponent sign.
_advance();
}
// Consume exponent digits.
if (!is_digit(_peek())) {
Token error = make_error(R"(Expected exponent value after "e".)");
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
}
previous_was_underscore = false;
while (is_digit(_peek()) || is_underscore(_peek())) {
if (is_underscore(_peek())) {
if (previous_was_underscore) {
Token error = make_error(R"(Multiple underscores cannot be adjacent in a numeric literal.)");
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
}
previous_was_underscore = true;
} else {
previous_was_underscore = false;
}
_advance();
}
}
}
if (need_digits) {
// No digits in hex or bin literal.
Token error = make_error(vformat(R"(Expected %s digit after "0%c".)", (base == 16 ? "hexadecimal" : "binary"), (base == 16 ? 'x' : 'b')));
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
return error;
}
// Detect extra decimal point.
if (!has_error && has_decimal && _peek() == '.' && _peek(1) != '.') {
Token error = make_error("Cannot use a decimal point twice in a number.");
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
has_error = true;
} else if (is_unicode_identifier_start(_peek()) || is_unicode_identifier_continue(_peek())) {
// Letter at the end of the number.
push_error("Invalid numeric notation.");
}
// Create a string with the whole number.
int len = _current - _start;
String number = String(_start, len).replace("_", "");
// Convert to the appropriate literal type.
if (base == 16) {
int64_t value = number.hex_to_int();
return make_literal(value);
} else if (base == 2) {
int64_t value = number.bin_to_int();
return make_literal(value);
} else if (has_decimal || has_exponent) {
double value = number.to_float();
return make_literal(value);
} else {
int64_t value = number.to_int();
return make_literal(value);
}
}
GDScriptTokenizer::Token GDScriptTokenizerText::string() {
enum StringType {
STRING_REGULAR,
STRING_NAME,
STRING_NODEPATH,
};
bool is_raw = false;
bool is_multiline = false;
StringType type = STRING_REGULAR;
if (_peek(-1) == 'r') {
is_raw = true;
_advance();
} else if (_peek(-1) == '&') {
type = STRING_NAME;
_advance();
} else if (_peek(-1) == '^') {
type = STRING_NODEPATH;
_advance();
}
char32_t quote_char = _peek(-1);
if (_peek() == quote_char && _peek(1) == quote_char) {
is_multiline = true;
// Consume all quotes.
_advance();
_advance();
}
String result;
char32_t prev = 0;
int prev_pos = 0;
for (;;) {
// Consume actual string.
if (_is_at_end()) {
return make_error("Unterminated string.");
}
char32_t ch = _peek();
if (ch == 0x200E || ch == 0x200F || (ch >= 0x202A && ch <= 0x202E) || (ch >= 0x2066 && ch <= 0x2069)) {
Token error;
if (is_raw) {
error = make_error("Invisible text direction control character present in the string, use regular string literal instead of r-string.");
} else {
error = make_error("Invisible text direction control character present in the string, escape it (\"\\u" + String::num_int64(ch, 16) + "\") to avoid confusion.");
}
error.start_column = column;
error.leftmost_column = error.start_column;
error.end_column = column + 1;
error.rightmost_column = error.end_column;
push_error(error);
}
if (ch == '\\') {
// Escape pattern.
_advance();
if (_is_at_end()) {
return make_error("Unterminated string.");
}
if (is_raw) {
if (_peek() == quote_char) {
_advance();
if (_is_at_end()) {
return make_error("Unterminated string.");
}
result += '\\';
result += quote_char;
} else if (_peek() == '\\') { // For `\\\"`.
_advance();
if (_is_at_end()) {
return make_error("Unterminated string.");
}
result += '\\';
result += '\\';
} else {
result += '\\';
}
} else {
// Grab escape character.
char32_t code = _peek();
_advance();
if (_is_at_end()) {
return make_error("Unterminated string.");
}
char32_t escaped = 0;
bool valid_escape = true;
switch (code) {
case 'a':
escaped = '\a';
break;
case 'b':
escaped = '\b';
break;
case 'f':
escaped = '\f';
break;
case 'n':
escaped = '\n';
break;
case 'r':
escaped = '\r';
break;
case 't':
escaped = '\t';
break;
case 'v':
escaped = '\v';
break;
case '\'':
escaped = '\'';
break;
case '\"':
escaped = '\"';
break;
case '\\':
escaped = '\\';
break;
case 'U':
case 'u': {
// Hexadecimal sequence.
int hex_len = (code == 'U') ? 6 : 4;
for (int j = 0; j < hex_len; j++) {
if (_is_at_end()) {
return make_error("Unterminated string.");
}
char32_t digit = _peek();
char32_t value = 0;
if (is_digit(digit)) {
value = digit - '0';
} else if (digit >= 'a' && digit <= 'f') {
value = digit - 'a';
value += 10;
} else if (digit >= 'A' && digit <= 'F') {
value = digit - 'A';
value += 10;
} else {
// Make error, but keep parsing the string.
Token error = make_error("Invalid hexadecimal digit in unicode escape sequence.");
error.start_column = column;
error.leftmost_column = error.start_column;
error.end_column = column + 1;
error.rightmost_column = error.end_column;
push_error(error);
valid_escape = false;
break;
}
escaped <<= 4;
escaped |= value;
_advance();
}
} break;
case '\r':
if (_peek() != '\n') {
// Carriage return without newline in string. (???)
// Just add it to the string and keep going.
result += ch;
_advance();
break;
}
[[fallthrough]];
case '\n':
// Escaping newline.
newline(false);
valid_escape = false; // Don't add to the string.
break;
default:
Token error = make_error("Invalid escape in string.");
error.start_column = column - 2;
error.leftmost_column = error.start_column;
push_error(error);
valid_escape = false;
break;
}
// Parse UTF-16 pair.
if (valid_escape) {
if ((escaped & 0xfffffc00) == 0xd800) {
if (prev == 0) {
prev = escaped;
prev_pos = column - 2;
continue;
} else {
Token error = make_error("Invalid UTF-16 sequence in string, unpaired lead surrogate.");
error.start_column = column - 2;
error.leftmost_column = error.start_column;
push_error(error);
valid_escape = false;
prev = 0;
}
} else if ((escaped & 0xfffffc00) == 0xdc00) {
if (prev == 0) {
Token error = make_error("Invalid UTF-16 sequence in string, unpaired trail surrogate.");
error.start_column = column - 2;
error.leftmost_column = error.start_column;
push_error(error);
valid_escape = false;
} else {
escaped = (prev << 10UL) + escaped - ((0xd800 << 10UL) + 0xdc00 - 0x10000);
prev = 0;
}
}
if (prev != 0) {
Token error = make_error("Invalid UTF-16 sequence in string, unpaired lead surrogate.");
error.start_column = prev_pos;
error.leftmost_column = error.start_column;
push_error(error);
prev = 0;
}
}
if (valid_escape) {
result += escaped;
}
}
} else if (ch == quote_char) {
if (prev != 0) {
Token error = make_error("Invalid UTF-16 sequence in string, unpaired lead surrogate");
error.start_column = prev_pos;
error.leftmost_column = error.start_column;
push_error(error);
prev = 0;
}
_advance();
if (is_multiline) {
if (_peek() == quote_char && _peek(1) == quote_char) {
// Ended the multiline string. Consume all quotes.
_advance();
_advance();
break;
} else {
// Not a multiline string termination, add consumed quote.
result += quote_char;
}
} else {
// Ended single-line string.
break;
}
} else {
if (prev != 0) {
Token error = make_error("Invalid UTF-16 sequence in string, unpaired lead surrogate");
error.start_column = prev_pos;
error.leftmost_column = error.start_column;
push_error(error);
prev = 0;
}
result += ch;
_advance();
if (ch == '\n') {
newline(false);
}
}
}
if (prev != 0) {
Token error = make_error("Invalid UTF-16 sequence in string, unpaired lead surrogate");
error.start_column = prev_pos;
error.leftmost_column = error.start_column;
push_error(error);
prev = 0;
}
// Make the literal.
Variant string;
switch (type) {
case STRING_NAME:
string = StringName(result);
break;
case STRING_NODEPATH:
string = NodePath(result);
break;
case STRING_REGULAR:
string = result;
break;
}
return make_literal(string);
}
void GDScriptTokenizerText::check_indent() {
ERR_FAIL_COND_MSG(column != 1, "Checking tokenizer indentation in the middle of a line.");
if (_is_at_end()) {
// Send dedents for every indent level.
pending_indents -= indent_level();
indent_stack.clear();
return;
}
for (;;) {
char32_t current_indent_char = _peek();
int indent_count = 0;
if (current_indent_char != ' ' && current_indent_char != '\t' && current_indent_char != '\r' && current_indent_char != '\n' && current_indent_char != '#') {
// First character of the line is not whitespace, so we clear all indentation levels.
// Unless we are in a continuation or in multiline mode (inside expression).
if (line_continuation || multiline_mode) {
return;
}
pending_indents -= indent_level();
indent_stack.clear();
return;
}
if (_peek() == '\r') {
_advance();
if (_peek() != '\n') {
push_error("Stray carriage return character in source code.");
}
}
if (_peek() == '\n') {
// Empty line, keep going.
_advance();
newline(false);
continue;
}
// Check indent level.
bool mixed = false;
while (!_is_at_end()) {
char32_t space = _peek();
if (space == '\t') {
// Consider individual tab columns.
column += tab_size - 1;
indent_count += tab_size;
} else if (space == ' ') {
indent_count += 1;
} else {
break;
}
mixed = mixed || space != current_indent_char;
_advance();
}
if (_is_at_end()) {
// Reached the end with an empty line, so just dedent as much as needed.
pending_indents -= indent_level();
indent_stack.clear();
return;
}
if (_peek() == '\r') {
_advance();
if (_peek() != '\n') {
push_error("Stray carriage return character in source code.");
}
}
if (_peek() == '\n') {
// Empty line, keep going.
_advance();
newline(false);
continue;
}
if (_peek() == '#') {
// Comment. Advance to the next line.
#ifdef TOOLS_ENABLED
String comment;
while (_peek() != '\n' && !_is_at_end()) {
comment += _advance();
}
comments[line] = CommentData(comment, true);
#else
while (_peek() != '\n' && !_is_at_end()) {
_advance();
}
#endif // TOOLS_ENABLED
if (_is_at_end()) {
// Reached the end with an empty line, so just dedent as much as needed.
pending_indents -= indent_level();
indent_stack.clear();
return;
}
_advance(); // Consume '\n'.
newline(false);
continue;
}
if (mixed && !line_continuation && !multiline_mode) {
Token error = make_error("Mixed use of tabs and spaces for indentation.");
error.start_line = line;
error.start_column = 1;
error.leftmost_column = 1;
error.rightmost_column = column;
push_error(error);
}
if (line_continuation || multiline_mode) {
// We cleared up all the whitespace at the beginning of the line.
// If this is a line continuation or we're in multiline mode then we don't want any indentation changes.
return;
}
// Check if indentation character is consistent.
if (indent_char == '\0') {
// First time indenting, choose character now.
indent_char = current_indent_char;
} else if (current_indent_char != indent_char) {
Token error = make_error(vformat("Used %s character for indentation instead of %s as used before in the file.",
_get_indent_char_name(current_indent_char), _get_indent_char_name(indent_char)));
error.start_line = line;
error.start_column = 1;
error.leftmost_column = 1;
error.rightmost_column = column;
push_error(error);
}
// Now we can do actual indentation changes.
// Check if indent or dedent.
int previous_indent = 0;
if (indent_level() > 0) {
previous_indent = indent_stack.back()->get();
}
if (indent_count == previous_indent) {
// No change in indentation.
return;
}
if (indent_count > previous_indent) {
// Indentation increased.
indent_stack.push_back(indent_count);
pending_indents++;
} else {
// Indentation decreased (dedent).
if (indent_level() == 0) {
push_error("Tokenizer bug: trying to dedent without previous indent.");
return;
}
while (indent_level() > 0 && indent_stack.back()->get() > indent_count) {
indent_stack.pop_back();
pending_indents--;
}
if ((indent_level() > 0 && indent_stack.back()->get() != indent_count) || (indent_level() == 0 && indent_count != 0)) {
// Mismatched indentation alignment.
Token error = make_error("Unindent doesn't match the previous indentation level.");
error.start_line = line;
error.start_column = 1;
error.leftmost_column = 1;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
// Still, we'll be lenient and keep going, so keep this level in the stack.
indent_stack.push_back(indent_count);
}
}
break; // Get out of the loop in any case.
}
}
String GDScriptTokenizerText::_get_indent_char_name(char32_t ch) {
ERR_FAIL_COND_V(ch != ' ' && ch != '\t', String(&ch, 1).c_escape());
return ch == ' ' ? "space" : "tab";
}
void GDScriptTokenizerText::_skip_whitespace() {
if (pending_indents != 0) {
// Still have some indent/dedent tokens to give.
return;
}
bool is_bol = column == 1; // Beginning of line.
if (is_bol) {
check_indent();
return;
}
for (;;) {
char32_t c = _peek();
switch (c) {
case ' ':
_advance();
break;
case '\t':
_advance();
// Consider individual tab columns.
column += tab_size - 1;
break;
case '\r':
_advance(); // Consume either way.
if (_peek() != '\n') {
push_error("Stray carriage return character in source code.");
return;
}
break;
case '\n':
_advance();
newline(!is_bol); // Don't create new line token if line is empty.
check_indent();
break;
case '#': {
// Comment.
#ifdef TOOLS_ENABLED
String comment;
while (_peek() != '\n' && !_is_at_end()) {
comment += _advance();
}
comments[line] = CommentData(comment, is_bol);
#else
while (_peek() != '\n' && !_is_at_end()) {
_advance();
}
#endif // TOOLS_ENABLED
if (_is_at_end()) {
return;
}
_advance(); // Consume '\n'
newline(!is_bol);
check_indent();
} break;
default:
return;
}
}
}
GDScriptTokenizer::Token GDScriptTokenizerText::scan() {
if (has_error()) {
return pop_error();
}
_skip_whitespace();
if (pending_newline) {
pending_newline = false;
if (!multiline_mode) {
// Don't return newline tokens on multiline mode.
return last_newline;
}
}
// Check for potential errors after skipping whitespace().
if (has_error()) {
return pop_error();
}
_start = _current;
start_line = line;
start_column = column;
leftmost_column = column;
rightmost_column = column;
if (pending_indents != 0) {
// Adjust position for indent.
_start -= start_column - 1;
start_column = 1;
leftmost_column = 1;
if (pending_indents > 0) {
// Indents.
pending_indents--;
return make_token(Token::INDENT);
} else {
// Dedents.
pending_indents++;
Token dedent = make_token(Token::DEDENT);
dedent.end_column += 1;
dedent.rightmost_column += 1;
return dedent;
}
}
if (_is_at_end()) {
return make_token(Token::TK_EOF);
}
const char32_t c = _advance();
if (c == '\\') {
// Line continuation with backslash.
if (_peek() == '\r') {
if (_peek(1) != '\n') {
return make_error("Unexpected carriage return character.");
}
_advance();
}
if (_peek() != '\n') {
return make_error("Expected new line after \"\\\".");
}
continuation_lines.push_back(line);
_advance();
newline(false);
line_continuation = true;
return scan(); // Recurse to get next token.
}
line_continuation = false;
if (is_digit(c)) {
return number();
} else if (c == 'r' && (_peek() == '"' || _peek() == '\'')) {
// Raw string literals.
return string();
} else if (is_unicode_identifier_start(c)) {
return potential_identifier();
}
switch (c) {
// String literals.
case '"':
case '\'':
return string();
// Annotation.
case '@':
return annotation();
// Single characters.
case '~':
return make_token(Token::TILDE);
case ',':
return make_token(Token::COMMA);
case ':':
return make_token(Token::COLON);
case ';':
return make_token(Token::SEMICOLON);
case '$':
return make_token(Token::DOLLAR);
case '?':
return make_token(Token::QUESTION_MARK);
case '`':
return make_token(Token::BACKTICK);
// Parens.
case '(':
push_paren('(');
return make_token(Token::PARENTHESIS_OPEN);
case '[':
push_paren('[');
return make_token(Token::BRACKET_OPEN);
case '{':
push_paren('{');
return make_token(Token::BRACE_OPEN);
case ')':
if (!pop_paren('(')) {
return make_paren_error(c);
}
return make_token(Token::PARENTHESIS_CLOSE);
case ']':
if (!pop_paren('[')) {
return make_paren_error(c);
}
return make_token(Token::BRACKET_CLOSE);
case '}':
if (!pop_paren('{')) {
return make_paren_error(c);
}
return make_token(Token::BRACE_CLOSE);
// Double characters.
case '!':
if (_peek() == '=') {
_advance();
return make_token(Token::BANG_EQUAL);
} else {
return make_token(Token::BANG);
}
case '.':
if (_peek() == '.') {
_advance();
return make_token(Token::PERIOD_PERIOD);
} else if (is_digit(_peek())) {
// Number starting with '.'.
return number();
} else {
return make_token(Token::PERIOD);
}
case '+':
if (_peek() == '=') {
_advance();
return make_token(Token::PLUS_EQUAL);
} else if (is_digit(_peek()) && !last_token.can_precede_bin_op()) {
// Number starting with '+'.
return number();
} else {
return make_token(Token::PLUS);
}
case '-':
if (_peek() == '=') {
_advance();
return make_token(Token::MINUS_EQUAL);
} else if (is_digit(_peek()) && !last_token.can_precede_bin_op()) {
// Number starting with '-'.
return number();
} else if (_peek() == '>') {
_advance();
return make_token(Token::FORWARD_ARROW);
} else {
return make_token(Token::MINUS);
}
case '*':
if (_peek() == '=') {
_advance();
return make_token(Token::STAR_EQUAL);
} else if (_peek() == '*') {
if (_peek(1) == '=') {
_advance();
_advance(); // Advance both '*' and '='
return make_token(Token::STAR_STAR_EQUAL);
}
_advance();
return make_token(Token::STAR_STAR);
} else {
return make_token(Token::STAR);
}
case '/':
if (_peek() == '=') {
_advance();
return make_token(Token::SLASH_EQUAL);
} else {
return make_token(Token::SLASH);
}
case '%':
if (_peek() == '=') {
_advance();
return make_token(Token::PERCENT_EQUAL);
} else {
return make_token(Token::PERCENT);
}
case '^':
if (_peek() == '=') {
_advance();
return make_token(Token::CARET_EQUAL);
} else if (_peek() == '"' || _peek() == '\'') {
// Node path
return string();
} else {
return make_token(Token::CARET);
}
case '&':
if (_peek() == '&') {
_advance();
return make_token(Token::AMPERSAND_AMPERSAND);
} else if (_peek() == '=') {
_advance();
return make_token(Token::AMPERSAND_EQUAL);
} else if (_peek() == '"' || _peek() == '\'') {
// String Name
return string();
} else {
return make_token(Token::AMPERSAND);
}
case '|':
if (_peek() == '|') {
_advance();
return make_token(Token::PIPE_PIPE);
} else if (_peek() == '=') {
_advance();
return make_token(Token::PIPE_EQUAL);
} else {
return make_token(Token::PIPE);
}
// Potential VCS conflict markers.
case '=':
if (_peek() == '=') {
return check_vcs_marker('=', Token::EQUAL_EQUAL);
} else {
return make_token(Token::EQUAL);
}
case '<':
if (_peek() == '=') {
_advance();
return make_token(Token::LESS_EQUAL);
} else if (_peek() == '<') {
if (_peek(1) == '=') {
_advance();
_advance(); // Advance both '<' and '='
return make_token(Token::LESS_LESS_EQUAL);
} else {
return check_vcs_marker('<', Token::LESS_LESS);
}
} else {
return make_token(Token::LESS);
}
case '>':
if (_peek() == '=') {
_advance();
return make_token(Token::GREATER_EQUAL);
} else if (_peek() == '>') {
if (_peek(1) == '=') {
_advance();
_advance(); // Advance both '>' and '='
return make_token(Token::GREATER_GREATER_EQUAL);
} else {
return check_vcs_marker('>', Token::GREATER_GREATER);
}
} else {
return make_token(Token::GREATER);
}
default:
if (is_whitespace(c)) {
return make_error(vformat(R"(Invalid white space character U+%04X.)", static_cast<int32_t>(c)));
} else {
return make_error(vformat(R"(Invalid character "%c" (U+%04X).)", c, static_cast<int32_t>(c)));
}
}
}
GDScriptTokenizerText::GDScriptTokenizerText() {
#ifdef TOOLS_ENABLED
if (EditorSettings::get_singleton()) {
tab_size = EditorSettings::get_singleton()->get_setting("text_editor/behavior/indent/size");
}
#endif // TOOLS_ENABLED
#ifdef DEBUG_ENABLED
make_keyword_list();
#endif // DEBUG_ENABLED
}
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