753 lines
19 KiB
C++
753 lines
19 KiB
C++
/*************************************************************************/
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/* script_class_parser.cpp */
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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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#include "script_class_parser.h"
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#include "core/os/os.h"
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#include "core/templates/map.h"
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#include "../utils/string_utils.h"
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const char *ScriptClassParser::token_names[ScriptClassParser::TK_MAX] = {
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"[",
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"]",
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"{",
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"}",
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".",
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":",
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",",
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"Symbol",
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"Identifier",
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"String",
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"Number",
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"<",
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">",
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"EOF",
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"Error"
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};
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String ScriptClassParser::get_token_name(ScriptClassParser::Token p_token) {
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ERR_FAIL_INDEX_V(p_token, TK_MAX, "<error>");
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return token_names[p_token];
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}
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ScriptClassParser::Token ScriptClassParser::get_token() {
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while (true) {
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switch (code[idx]) {
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case '\n': {
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line++;
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idx++;
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break;
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};
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case 0: {
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return TK_EOF;
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} break;
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case '{': {
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idx++;
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return TK_CURLY_BRACKET_OPEN;
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};
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case '}': {
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idx++;
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return TK_CURLY_BRACKET_CLOSE;
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};
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case '[': {
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idx++;
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return TK_BRACKET_OPEN;
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};
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case ']': {
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idx++;
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return TK_BRACKET_CLOSE;
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};
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case '<': {
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idx++;
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return TK_OP_LESS;
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};
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case '>': {
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idx++;
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return TK_OP_GREATER;
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};
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case ':': {
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idx++;
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return TK_COLON;
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};
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case ',': {
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idx++;
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return TK_COMMA;
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};
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case '.': {
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idx++;
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return TK_PERIOD;
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};
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case '#': {
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//compiler directive
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while (code[idx] != '\n' && code[idx] != 0) {
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idx++;
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}
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continue;
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} break;
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case '/': {
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switch (code[idx + 1]) {
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case '*': { // block comment
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idx += 2;
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while (true) {
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if (code[idx] == 0) {
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error_str = "Unterminated comment";
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error = true;
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return TK_ERROR;
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} else if (code[idx] == '*' && code[idx + 1] == '/') {
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idx += 2;
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break;
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} else if (code[idx] == '\n') {
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line++;
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}
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idx++;
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}
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} break;
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case '/': { // line comment skip
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while (code[idx] != '\n' && code[idx] != 0) {
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idx++;
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}
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} break;
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default: {
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value = "/";
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idx++;
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return TK_SYMBOL;
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}
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}
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continue; // a comment
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} break;
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case '\'':
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case '"': {
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bool verbatim = idx != 0 && code[idx - 1] == '@';
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char32_t begin_str = code[idx];
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idx++;
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String tk_string = String();
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while (true) {
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if (code[idx] == 0) {
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error_str = "Unterminated String";
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error = true;
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return TK_ERROR;
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} else if (code[idx] == begin_str) {
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if (verbatim && code[idx + 1] == '"') { // '""' is verbatim string's '\"'
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idx += 2; // skip next '"' as well
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continue;
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}
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idx += 1;
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break;
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} else if (code[idx] == '\\' && !verbatim) {
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//escaped characters...
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idx++;
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char32_t next = code[idx];
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if (next == 0) {
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error_str = "Unterminated String";
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error = true;
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return TK_ERROR;
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}
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char32_t res = 0;
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switch (next) {
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case 'b':
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res = 8;
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break;
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case 't':
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res = 9;
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break;
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case 'n':
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res = 10;
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break;
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case 'f':
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res = 12;
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break;
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case 'r':
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res = 13;
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break;
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case '\"':
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res = '\"';
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break;
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case '\\':
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res = '\\';
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break;
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default: {
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res = next;
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} break;
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}
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tk_string += res;
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} else {
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if (code[idx] == '\n') {
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line++;
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}
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tk_string += code[idx];
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}
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idx++;
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}
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value = tk_string;
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return TK_STRING;
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} break;
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default: {
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if (code[idx] <= 32) {
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idx++;
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break;
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}
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if ((code[idx] >= 33 && code[idx] <= 47) || (code[idx] >= 58 && code[idx] <= 63) || (code[idx] >= 91 && code[idx] <= 94) || code[idx] == 96 || (code[idx] >= 123 && code[idx] <= 127)) {
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value = String::chr(code[idx]);
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idx++;
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return TK_SYMBOL;
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}
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if (code[idx] == '-' || (code[idx] >= '0' && code[idx] <= '9')) {
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//a number
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const char32_t *rptr;
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double number = String::to_float(&code[idx], &rptr);
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idx += (rptr - &code[idx]);
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value = number;
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return TK_NUMBER;
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} else if ((code[idx] == '@' && code[idx + 1] != '"') || code[idx] == '_' || (code[idx] >= 'A' && code[idx] <= 'Z') || (code[idx] >= 'a' && code[idx] <= 'z') || code[idx] > 127) {
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String id;
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id += code[idx];
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idx++;
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while (code[idx] == '_' || (code[idx] >= 'A' && code[idx] <= 'Z') || (code[idx] >= 'a' && code[idx] <= 'z') || (code[idx] >= '0' && code[idx] <= '9') || code[idx] > 127) {
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id += code[idx];
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idx++;
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}
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value = id;
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return TK_IDENTIFIER;
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} else if (code[idx] == '@' && code[idx + 1] == '"') {
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// begin of verbatim string
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idx++;
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} else {
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error_str = "Unexpected character.";
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error = true;
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return TK_ERROR;
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}
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}
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}
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}
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}
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Error ScriptClassParser::_skip_generic_type_params() {
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Token tk;
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while (true) {
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tk = get_token();
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if (tk == TK_IDENTIFIER) {
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tk = get_token();
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// Type specifications can end with "?" to denote nullable types, such as IList<int?>
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if (tk == TK_SYMBOL) {
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tk = get_token();
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if (value.operator String() != "?") {
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error_str = "Expected " + get_token_name(TK_IDENTIFIER) + ", found unexpected symbol '" + value + "'";
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error = true;
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return ERR_PARSE_ERROR;
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}
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if (tk != TK_OP_GREATER && tk != TK_COMMA) {
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error_str = "Nullable type symbol '?' is only allowed after an identifier, but found " + get_token_name(tk) + " next.";
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error = true;
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return ERR_PARSE_ERROR;
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}
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}
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if (tk == TK_PERIOD) {
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while (true) {
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tk = get_token();
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if (tk != TK_IDENTIFIER) {
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error_str = "Expected " + get_token_name(TK_IDENTIFIER) + ", found: " + get_token_name(tk);
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error = true;
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return ERR_PARSE_ERROR;
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}
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tk = get_token();
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if (tk != TK_PERIOD) {
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break;
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}
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}
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}
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if (tk == TK_OP_LESS) {
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Error err = _skip_generic_type_params();
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if (err) {
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return err;
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}
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tk = get_token();
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}
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if (tk == TK_OP_GREATER) {
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return OK;
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} else if (tk != TK_COMMA) {
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error_str = "Unexpected token: " + get_token_name(tk);
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error = true;
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return ERR_PARSE_ERROR;
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}
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} else if (tk == TK_OP_LESS) {
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error_str = "Expected " + get_token_name(TK_IDENTIFIER) + ", found " + get_token_name(TK_OP_LESS);
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error = true;
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return ERR_PARSE_ERROR;
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} else if (tk == TK_OP_GREATER) {
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return OK;
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} else {
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error_str = "Unexpected token: " + get_token_name(tk);
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error = true;
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return ERR_PARSE_ERROR;
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}
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}
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}
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Error ScriptClassParser::_parse_type_full_name(String &r_full_name) {
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Token tk = get_token();
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if (tk != TK_IDENTIFIER) {
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error_str = "Expected " + get_token_name(TK_IDENTIFIER) + ", found: " + get_token_name(tk);
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error = true;
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return ERR_PARSE_ERROR;
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}
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r_full_name += String(value);
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if (code[idx] == '<') {
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idx++;
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// We don't mind if the base is generic, but we skip it any ways since this information is not needed
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Error err = _skip_generic_type_params();
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if (err) {
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return err;
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}
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}
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if (code[idx] != '.') { // We only want to take the next token if it's a period
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return OK;
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}
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tk = get_token();
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CRASH_COND(tk != TK_PERIOD); // Assertion
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r_full_name += ".";
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return _parse_type_full_name(r_full_name);
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}
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Error ScriptClassParser::_parse_class_base(Vector<String> &r_base) {
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String name;
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Error err = _parse_type_full_name(name);
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if (err) {
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return err;
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}
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Token tk = get_token();
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if (tk == TK_COMMA) {
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err = _parse_class_base(r_base);
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if (err) {
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return err;
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}
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} else if (tk == TK_IDENTIFIER && String(value) == "where") {
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err = _parse_type_constraints();
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if (err) {
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return err;
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}
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// An open curly bracket was parsed by _parse_type_constraints, so we can exit
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} else if (tk == TK_CURLY_BRACKET_OPEN) {
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// we are finished when we hit the open curly bracket
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} else {
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error_str = "Unexpected token: " + get_token_name(tk);
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error = true;
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return ERR_PARSE_ERROR;
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}
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r_base.push_back(name);
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return OK;
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}
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Error ScriptClassParser::_parse_type_constraints() {
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Token tk = get_token();
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if (tk != TK_IDENTIFIER) {
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error_str = "Unexpected token: " + get_token_name(tk);
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error = true;
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return ERR_PARSE_ERROR;
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}
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tk = get_token();
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if (tk != TK_COLON) {
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error_str = "Unexpected token: " + get_token_name(tk);
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error = true;
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return ERR_PARSE_ERROR;
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}
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while (true) {
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tk = get_token();
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if (tk == TK_IDENTIFIER) {
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if (String(value) == "where") {
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return _parse_type_constraints();
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}
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tk = get_token();
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if (tk == TK_PERIOD) {
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while (true) {
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tk = get_token();
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if (tk != TK_IDENTIFIER) {
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error_str = "Expected " + get_token_name(TK_IDENTIFIER) + ", found: " + get_token_name(tk);
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error = true;
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return ERR_PARSE_ERROR;
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}
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tk = get_token();
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if (tk != TK_PERIOD) {
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break;
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}
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}
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}
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}
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if (tk == TK_COMMA) {
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continue;
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} else if (tk == TK_IDENTIFIER && String(value) == "where") {
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return _parse_type_constraints();
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} else if (tk == TK_SYMBOL && String(value) == "(") {
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tk = get_token();
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if (tk != TK_SYMBOL || String(value) != ")") {
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error_str = "Unexpected token: " + get_token_name(tk);
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error = true;
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return ERR_PARSE_ERROR;
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}
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} else if (tk == TK_OP_LESS) {
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Error err = _skip_generic_type_params();
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if (err) {
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return err;
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}
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} else if (tk == TK_CURLY_BRACKET_OPEN) {
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return OK;
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} else {
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error_str = "Unexpected token: " + get_token_name(tk);
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error = true;
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return ERR_PARSE_ERROR;
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}
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}
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}
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Error ScriptClassParser::_parse_namespace_name(String &r_name, int &r_curly_stack) {
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Token tk = get_token();
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if (tk == TK_IDENTIFIER) {
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r_name += String(value);
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} else {
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error_str = "Unexpected token: " + get_token_name(tk);
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error = true;
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return ERR_PARSE_ERROR;
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}
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tk = get_token();
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if (tk == TK_PERIOD) {
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r_name += ".";
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return _parse_namespace_name(r_name, r_curly_stack);
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} else if (tk == TK_CURLY_BRACKET_OPEN) {
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r_curly_stack++;
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return OK;
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} else {
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error_str = "Unexpected token: " + get_token_name(tk);
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error = true;
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return ERR_PARSE_ERROR;
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}
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}
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Error ScriptClassParser::parse(const String &p_code) {
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code = p_code;
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idx = 0;
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line = 0;
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error_str = String();
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error = false;
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value = Variant();
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classes.clear();
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Token tk = get_token();
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Map<int, NameDecl> name_stack;
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int curly_stack = 0;
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int type_curly_stack = 0;
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while (!error && tk != TK_EOF) {
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String identifier = value;
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if (tk == TK_IDENTIFIER && (identifier == "class" || identifier == "struct")) {
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bool is_class = identifier == "class";
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tk = get_token();
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if (tk == TK_IDENTIFIER) {
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String name = value;
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int at_level = curly_stack;
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ClassDecl class_decl;
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for (Map<int, NameDecl>::Element *E = name_stack.front(); E; E = E->next()) {
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const NameDecl &name_decl = E->value();
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if (name_decl.type == NameDecl::NAMESPACE_DECL) {
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if (E != name_stack.front()) {
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class_decl.namespace_ += ".";
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}
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class_decl.namespace_ += name_decl.name;
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} else {
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class_decl.name += name_decl.name + ".";
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}
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}
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class_decl.name += name;
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class_decl.nested = type_curly_stack > 0;
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bool generic = false;
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while (true) {
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tk = get_token();
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if (tk == TK_COLON) {
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Error err = _parse_class_base(class_decl.base);
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if (err) {
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return err;
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}
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curly_stack++;
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type_curly_stack++;
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break;
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} else if (tk == TK_CURLY_BRACKET_OPEN) {
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curly_stack++;
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type_curly_stack++;
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break;
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} else if (tk == TK_OP_LESS && !generic) {
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generic = true;
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Error err = _skip_generic_type_params();
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if (err) {
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return err;
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}
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} else if (tk == TK_IDENTIFIER && String(value) == "where") {
|
|
Error err = _parse_type_constraints();
|
|
if (err) {
|
|
return err;
|
|
}
|
|
|
|
// An open curly bracket was parsed by _parse_type_constraints, so we can exit
|
|
curly_stack++;
|
|
type_curly_stack++;
|
|
break;
|
|
} else {
|
|
error_str = "Unexpected token: " + get_token_name(tk);
|
|
error = true;
|
|
return ERR_PARSE_ERROR;
|
|
}
|
|
}
|
|
|
|
NameDecl name_decl;
|
|
name_decl.name = name;
|
|
name_decl.type = is_class ? NameDecl::CLASS_DECL : NameDecl::STRUCT_DECL;
|
|
name_stack[at_level] = name_decl;
|
|
|
|
if (is_class) {
|
|
if (!generic) { // no generics, thanks
|
|
classes.push_back(class_decl);
|
|
} else if (OS::get_singleton()->is_stdout_verbose()) {
|
|
String full_name = class_decl.namespace_;
|
|
if (full_name.length()) {
|
|
full_name += ".";
|
|
}
|
|
full_name += class_decl.name;
|
|
OS::get_singleton()->print("Ignoring generic class declaration: %s\n", full_name.utf8().get_data());
|
|
}
|
|
}
|
|
}
|
|
} else if (tk == TK_IDENTIFIER && identifier == "namespace") {
|
|
if (type_curly_stack > 0) {
|
|
error_str = "Found namespace nested inside type.";
|
|
error = true;
|
|
return ERR_PARSE_ERROR;
|
|
}
|
|
|
|
String name;
|
|
int at_level = curly_stack;
|
|
|
|
Error err = _parse_namespace_name(name, curly_stack);
|
|
if (err) {
|
|
return err;
|
|
}
|
|
|
|
NameDecl name_decl;
|
|
name_decl.name = name;
|
|
name_decl.type = NameDecl::NAMESPACE_DECL;
|
|
name_stack[at_level] = name_decl;
|
|
} else if (tk == TK_CURLY_BRACKET_OPEN) {
|
|
curly_stack++;
|
|
} else if (tk == TK_CURLY_BRACKET_CLOSE) {
|
|
curly_stack--;
|
|
if (name_stack.has(curly_stack)) {
|
|
if (name_stack[curly_stack].type != NameDecl::NAMESPACE_DECL) {
|
|
type_curly_stack--;
|
|
}
|
|
name_stack.erase(curly_stack);
|
|
}
|
|
}
|
|
|
|
tk = get_token();
|
|
}
|
|
|
|
if (!error && tk == TK_EOF && curly_stack > 0) {
|
|
error_str = "Reached EOF with missing close curly brackets.";
|
|
error = true;
|
|
}
|
|
|
|
if (error) {
|
|
return ERR_PARSE_ERROR;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
static String get_preprocessor_directive(const String &p_line, int p_from) {
|
|
CRASH_COND(p_line[p_from] != '#');
|
|
p_from++;
|
|
int i = p_from;
|
|
while (i < p_line.length() && (p_line[i] == '_' || (p_line[i] >= 'A' && p_line[i] <= 'Z') ||
|
|
(p_line[i] >= 'a' && p_line[i] <= 'z') || p_line[i] > 127)) {
|
|
i++;
|
|
}
|
|
return p_line.substr(p_from, i - p_from);
|
|
}
|
|
|
|
static void run_dummy_preprocessor(String &r_source, const String &p_filepath) {
|
|
Vector<String> lines = r_source.split("\n", /* p_allow_empty: */ true);
|
|
|
|
bool *include_lines = memnew_arr(bool, lines.size());
|
|
|
|
int if_level = -1;
|
|
Vector<bool> is_branch_being_compiled;
|
|
|
|
for (int i = 0; i < lines.size(); i++) {
|
|
const String &line = lines[i];
|
|
|
|
const int line_len = line.length();
|
|
|
|
int j;
|
|
for (j = 0; j < line_len; j++) {
|
|
if (line[j] != ' ' && line[j] != '\t') {
|
|
if (line[j] == '#') {
|
|
// First non-whitespace char of the line is '#'
|
|
include_lines[i] = false;
|
|
|
|
String directive = get_preprocessor_directive(line, j);
|
|
|
|
if (directive == "if") {
|
|
if_level++;
|
|
is_branch_being_compiled.push_back(if_level == 0 || is_branch_being_compiled[if_level - 1]);
|
|
} else if (directive == "elif") {
|
|
ERR_CONTINUE_MSG(if_level == -1, "Found unexpected '#elif' directive. File: '" + p_filepath + "'.");
|
|
is_branch_being_compiled.write[if_level] = false;
|
|
} else if (directive == "else") {
|
|
ERR_CONTINUE_MSG(if_level == -1, "Found unexpected '#else' directive. File: '" + p_filepath + "'.");
|
|
is_branch_being_compiled.write[if_level] = false;
|
|
} else if (directive == "endif") {
|
|
ERR_CONTINUE_MSG(if_level == -1, "Found unexpected '#endif' directive. File: '" + p_filepath + "'.");
|
|
is_branch_being_compiled.remove(if_level);
|
|
if_level--;
|
|
}
|
|
|
|
break;
|
|
} else {
|
|
// First non-whitespace char of the line is not '#'
|
|
include_lines[i] = if_level == -1 || is_branch_being_compiled[if_level];
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (j == line_len) {
|
|
// Loop ended without finding a non-whitespace character.
|
|
// Either the line was empty or it only contained whitespaces.
|
|
include_lines[i] = if_level == -1 || is_branch_being_compiled[if_level];
|
|
}
|
|
}
|
|
|
|
r_source.clear();
|
|
|
|
// Custom join ignoring lines removed by the preprocessor
|
|
for (int i = 0; i < lines.size(); i++) {
|
|
if (i > 0 && include_lines[i - 1]) {
|
|
r_source += '\n';
|
|
}
|
|
|
|
if (include_lines[i]) {
|
|
r_source += lines[i];
|
|
}
|
|
}
|
|
}
|
|
|
|
Error ScriptClassParser::parse_file(const String &p_filepath) {
|
|
String source;
|
|
|
|
Error ferr = read_all_file_utf8(p_filepath, source);
|
|
|
|
ERR_FAIL_COND_V_MSG(ferr != OK, ferr,
|
|
ferr == ERR_INVALID_DATA ?
|
|
"File '" + p_filepath + "' contains invalid unicode (UTF-8), so it was not loaded."
|
|
" Please ensure that scripts are saved in valid UTF-8 unicode." :
|
|
"Failed to read file: '" + p_filepath + "'.");
|
|
|
|
run_dummy_preprocessor(source, p_filepath);
|
|
|
|
return parse(source);
|
|
}
|
|
|
|
String ScriptClassParser::get_error() {
|
|
return error_str;
|
|
}
|
|
|
|
Vector<ScriptClassParser::ClassDecl> ScriptClassParser::get_classes() {
|
|
return classes;
|
|
}
|