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c6e66a43b0
Lambda syntax is the same as a the function syntax (using the same
`func` keyword) except that the name is optional and it can be embedded
anywhere an expression is expected. E.g.:
func _ready():
var my_lambda = func(x):
print(x)
my_lambda.call("hello")
274 lines
7.1 KiB
C++
274 lines
7.1 KiB
C++
/*************************************************************************/
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/* gdscript_tokenizer.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef GDSCRIPT_TOKENIZER_H
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#define GDSCRIPT_TOKENIZER_H
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#include "core/templates/list.h"
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#include "core/templates/map.h"
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#include "core/templates/set.h"
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#include "core/templates/vector.h"
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#include "core/variant/variant.h"
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class GDScriptTokenizer {
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public:
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enum CursorPlace {
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CURSOR_NONE,
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CURSOR_BEGINNING,
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CURSOR_MIDDLE,
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CURSOR_END,
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};
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struct Token {
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enum Type {
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EMPTY,
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// Basic
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ANNOTATION,
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IDENTIFIER,
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LITERAL,
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// Comparison
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LESS,
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LESS_EQUAL,
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GREATER,
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GREATER_EQUAL,
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EQUAL_EQUAL,
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BANG_EQUAL,
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// Logical
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AND,
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OR,
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NOT,
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AMPERSAND_AMPERSAND,
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PIPE_PIPE,
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BANG,
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// Bitwise
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AMPERSAND,
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PIPE,
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TILDE,
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CARET,
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LESS_LESS,
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GREATER_GREATER,
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// Math
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PLUS,
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MINUS,
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STAR,
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SLASH,
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PERCENT,
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// Assignment
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EQUAL,
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PLUS_EQUAL,
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MINUS_EQUAL,
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STAR_EQUAL,
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SLASH_EQUAL,
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PERCENT_EQUAL,
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LESS_LESS_EQUAL,
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GREATER_GREATER_EQUAL,
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AMPERSAND_EQUAL,
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PIPE_EQUAL,
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CARET_EQUAL,
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// Control flow
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IF,
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ELIF,
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ELSE,
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FOR,
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WHILE,
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BREAK,
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CONTINUE,
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PASS,
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RETURN,
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MATCH,
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// Keywords
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AS,
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ASSERT,
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AWAIT,
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BREAKPOINT,
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CLASS,
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CLASS_NAME,
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CONST,
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ENUM,
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EXTENDS,
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FUNC,
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IN,
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IS,
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NAMESPACE,
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PRELOAD,
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SELF,
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SIGNAL,
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STATIC,
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SUPER,
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TRAIT,
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VAR,
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VOID,
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YIELD,
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// Punctuation
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BRACKET_OPEN,
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BRACKET_CLOSE,
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BRACE_OPEN,
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BRACE_CLOSE,
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PARENTHESIS_OPEN,
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PARENTHESIS_CLOSE,
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COMMA,
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SEMICOLON,
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PERIOD,
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PERIOD_PERIOD,
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COLON,
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DOLLAR,
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FORWARD_ARROW,
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UNDERSCORE,
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// Whitespace
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NEWLINE,
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INDENT,
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DEDENT,
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// Constants
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CONST_PI,
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CONST_TAU,
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CONST_INF,
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CONST_NAN,
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// Error message improvement
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VCS_CONFLICT_MARKER,
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BACKTICK,
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QUESTION_MARK,
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// Special
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ERROR,
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TK_EOF, // "EOF" is reserved
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TK_MAX
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};
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Type type = EMPTY;
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Variant literal;
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int start_line = 0, end_line = 0, start_column = 0, end_column = 0;
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int leftmost_column = 0, rightmost_column = 0; // Column span for multiline tokens.
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int cursor_position = -1;
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CursorPlace cursor_place = CURSOR_NONE;
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String source;
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const char *get_name() const;
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bool is_identifier() const;
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bool is_node_name() const;
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StringName get_identifier() const { return source; }
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Token(Type p_type) {
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type = p_type;
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}
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Token() {
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}
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};
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#ifdef TOOLS_ENABLED
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struct CommentData {
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String comment;
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bool new_line = false;
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CommentData() {}
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CommentData(const String &p_comment, bool p_new_line) {
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comment = p_comment;
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new_line = p_new_line;
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}
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};
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const Map<int, CommentData> &get_comments() const {
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return comments;
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}
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#endif // TOOLS_ENABLED
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private:
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String source;
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const char32_t *_source = nullptr;
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const char32_t *_current = nullptr;
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int line = -1, column = -1;
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int cursor_line = -1, cursor_column = -1;
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int tab_size = 4;
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// Keep track of multichar tokens.
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const char32_t *_start = nullptr;
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int start_line = 0, start_column = 0;
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int leftmost_column = 0, rightmost_column = 0;
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// Info cache.
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bool line_continuation = false; // Whether this line is a continuation of the previous, like when using '\'.
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bool multiline_mode = false;
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List<Token> error_stack;
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bool pending_newline = false;
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Token last_newline;
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int pending_indents = 0;
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List<int> indent_stack;
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List<List<int>> indent_stack_stack; // For lambdas, which require manipulating the indentation point.
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List<char32_t> paren_stack;
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char32_t indent_char = '\0';
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int position = 0;
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int length = 0;
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#ifdef TOOLS_ENABLED
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Map<int, CommentData> comments;
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#endif // TOOLS_ENABLED
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_FORCE_INLINE_ bool _is_at_end() { return position >= length; }
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_FORCE_INLINE_ char32_t _peek(int p_offset = 0) { return position + p_offset >= 0 && position + p_offset < length ? _current[p_offset] : '\0'; }
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int indent_level() const { return indent_stack.size(); }
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bool has_error() const { return !error_stack.is_empty(); }
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Token pop_error();
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char32_t _advance();
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void _skip_whitespace();
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void check_indent();
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Token make_error(const String &p_message);
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void push_error(const String &p_message);
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void push_error(const Token &p_error);
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Token make_paren_error(char32_t p_paren);
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Token make_token(Token::Type p_type);
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Token make_literal(const Variant &p_literal);
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Token make_identifier(const StringName &p_identifier);
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Token check_vcs_marker(char32_t p_test, Token::Type p_double_type);
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void push_paren(char32_t p_char);
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bool pop_paren(char32_t p_expected);
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void newline(bool p_make_token);
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Token number();
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Token potential_identifier();
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Token string();
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Token annotation();
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public:
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Token scan();
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void set_source_code(const String &p_source_code);
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int get_cursor_line() const;
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int get_cursor_column() const;
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void set_cursor_position(int p_line, int p_column);
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void set_multiline_mode(bool p_state);
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bool is_past_cursor() const;
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static String get_token_name(Token::Type p_token_type);
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void push_expression_indented_block(); // For lambdas, or blocks inside expressions.
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void pop_expression_indented_block(); // For lambdas, or blocks inside expressions.
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GDScriptTokenizer();
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};
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#endif
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