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Add dummy preprocessor for the C# script class parser

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No attempts are made at conditional compilation. The main if branch is always assumed to be true.
This commit is contained in:
Ignacio Etcheverry 2020-01-21 19:57:38 +01:00
parent ad8819ca61
commit 378fc592b1
1 changed files with 81 additions and 0 deletions
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81
modules/mono/editor/script_class_parser.cpp
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@ -631,6 +631,85 @@ Error ScriptClassParser::parse(const String &p_code) {
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] != '\t') {
i++;
}
return p_line.substr(p_from, i - p_from);
}
static void run_dummy_preprocessor(String &r_source) {
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 = 0;
while (j < line_len) {
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.");
is_branch_being_compiled.write[if_level] = false;
} else if (directive == "else") {
ERR_CONTINUE_MSG(if_level == -1, "Found unexpected '#else' directive.");
is_branch_being_compiled.write[if_level] = false;
} else if (directive == "endif") {
ERR_CONTINUE_MSG(if_level == -1, "Found unexpected '#endif' directive.");
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;
}
}
j++;
}
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;
@ -643,6 +722,8 @@ Error ScriptClassParser::parse_file(const String &p_filepath) {
" Please ensure that scripts are saved in valid UTF-8 unicode." :
"Failed to read file: '" + p_filepath + "'.");
run_dummy_preprocessor(source);
return parse(source);
}