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scanner.cc
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scanner.cc
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#include <tree_sitter/parser.h>
#include <string>
#include <cwctype>
namespace {
using std::string;
enum TokenType {
HEREDOC_START,
SIMPLE_HEREDOC_BODY,
HEREDOC_BODY_BEGINNING,
HEREDOC_BODY_MIDDLE,
HEREDOC_BODY_END,
FILE_DESCRIPTOR,
EMPTY_VALUE,
CONCAT,
VARIABLE_NAME,
REGEX,
CLOSING_BRACE,
CLOSING_BRACKET,
HEREDOC_ARROW,
HEREDOC_ARROW_DASH,
NEWLINE,
};
struct Scanner {
void skip(TSLexer *lexer) {
lexer->advance(lexer, true);
}
void advance(TSLexer *lexer) {
lexer->advance(lexer, false);
}
unsigned serialize(char *buffer) {
if (heredoc_delimiter.length() + 3 >= TREE_SITTER_SERIALIZATION_BUFFER_SIZE) return 0;
buffer[0] = heredoc_is_raw;
buffer[1] = started_heredoc;
buffer[2] = heredoc_allows_indent;
heredoc_delimiter.copy(&buffer[3], heredoc_delimiter.length());
return heredoc_delimiter.length() + 3;
}
void deserialize(const char *buffer, unsigned length) {
if (length == 0) {
heredoc_is_raw = false;
started_heredoc = false;
heredoc_allows_indent = false;
heredoc_delimiter.clear();
} else {
heredoc_is_raw = buffer[0];
started_heredoc = buffer[1];
heredoc_allows_indent = buffer[2];
heredoc_delimiter.assign(&buffer[3], &buffer[length]);
}
}
bool scan_heredoc_start(TSLexer *lexer) {
while (iswspace(lexer->lookahead)) skip(lexer);
lexer->result_symbol = HEREDOC_START;
heredoc_is_raw = lexer->lookahead == '\'';
started_heredoc = false;
heredoc_delimiter.clear();
if (lexer->lookahead == '\\') {
advance(lexer);
}
int32_t quote = 0;
if (heredoc_is_raw || lexer->lookahead == '"') {
quote = lexer->lookahead;
advance(lexer);
}
while (iswalpha(lexer->lookahead) || (quote != 0 && iswspace(lexer->lookahead))) {
heredoc_delimiter += lexer->lookahead;
advance(lexer);
}
if (lexer->lookahead == quote) {
advance(lexer);
}
return !heredoc_delimiter.empty();
}
bool scan_heredoc_end_identifier(TSLexer *lexer) {
current_leading_word.clear();
// Scan the first 'n' characters on this line, to see if they match the heredoc delimiter
while (
lexer->lookahead != '\0' &&
lexer->lookahead != '\n' &&
current_leading_word.length() < heredoc_delimiter.length()
) {
current_leading_word += lexer->lookahead;
advance(lexer);
}
return current_leading_word == heredoc_delimiter;
}
bool scan_heredoc_content(TSLexer *lexer, TokenType middle_type, TokenType end_type) {
bool did_advance = false;
for (;;) {
switch (lexer->lookahead) {
case '\0': {
if (did_advance) {
heredoc_is_raw = false;
started_heredoc = false;
heredoc_allows_indent = false;
heredoc_delimiter.clear();
lexer->result_symbol = end_type;
return true;
} else {
return false;
}
}
case '\\': {
did_advance = true;
advance(lexer);
advance(lexer);
break;
}
case '$': {
if (heredoc_is_raw) {
did_advance = true;
advance(lexer);
break;
} else if (did_advance) {
lexer->result_symbol = middle_type;
started_heredoc = true;
return true;
} else {
return false;
}
}
case '\n': {
did_advance = true;
advance(lexer);
if (heredoc_allows_indent) {
while (iswspace(lexer->lookahead)) {
advance(lexer);
}
}
if (scan_heredoc_end_identifier(lexer)) {
heredoc_is_raw = false;
started_heredoc = false;
heredoc_allows_indent = false;
heredoc_delimiter.clear();
lexer->result_symbol = end_type;
return true;
}
break;
}
default: {
did_advance = true;
advance(lexer);
break;
}
}
}
}
bool scan(TSLexer *lexer, const bool *valid_symbols) {
if (valid_symbols[CONCAT]) {
if (!(
lexer->lookahead == 0 ||
iswspace(lexer->lookahead) ||
lexer->lookahead == '\\' ||
lexer->lookahead == '>' ||
lexer->lookahead == '<' ||
lexer->lookahead == ')' ||
lexer->lookahead == '(' ||
lexer->lookahead == ';' ||
lexer->lookahead == '&' ||
lexer->lookahead == '|' ||
lexer->lookahead == '`' ||
lexer->lookahead == '#' ||
(lexer->lookahead == '}' && valid_symbols[CLOSING_BRACE]) ||
(lexer->lookahead == ']' && valid_symbols[CLOSING_BRACKET])
)) {
lexer->result_symbol = CONCAT;
return true;
}
}
if (valid_symbols[EMPTY_VALUE]) {
if (iswspace(lexer->lookahead)) {
lexer->result_symbol = EMPTY_VALUE;
return true;
}
}
if (valid_symbols[HEREDOC_BODY_BEGINNING] && !heredoc_delimiter.empty() && !started_heredoc) {
return scan_heredoc_content(lexer, HEREDOC_BODY_BEGINNING, SIMPLE_HEREDOC_BODY);
}
if (valid_symbols[HEREDOC_BODY_MIDDLE] && !heredoc_delimiter.empty() && started_heredoc) {
return scan_heredoc_content(lexer, HEREDOC_BODY_MIDDLE, HEREDOC_BODY_END);
}
if (valid_symbols[HEREDOC_START]) {
return scan_heredoc_start(lexer);
}
if (valid_symbols[VARIABLE_NAME] || valid_symbols[FILE_DESCRIPTOR] || valid_symbols[HEREDOC_ARROW]) {
for (;;) {
if (
lexer->lookahead == ' ' ||
lexer->lookahead == '\t' ||
lexer->lookahead == '\r' ||
(lexer->lookahead == '\n' && !valid_symbols[NEWLINE])
) {
skip(lexer);
} else if (lexer->lookahead == '\\') {
skip(lexer);
if (lexer->lookahead == '\r') {
skip(lexer);
}
if (lexer->lookahead == '\n') {
skip(lexer);
} else {
return false;
}
} else {
break;
}
}
if (valid_symbols[HEREDOC_ARROW] && lexer->lookahead == '<') {
advance(lexer);
if (lexer->lookahead == '<') {
advance(lexer);
if (lexer->lookahead == '-') {
advance(lexer);
heredoc_allows_indent = true;
lexer->result_symbol = HEREDOC_ARROW_DASH;
} else if (lexer->lookahead == '<') {
return false;
} else {
heredoc_allows_indent = false;
lexer->result_symbol = HEREDOC_ARROW;
}
return true;
}
return false;
}
bool is_number = true;
if (iswdigit(lexer->lookahead)) {
advance(lexer);
} else if (iswalpha(lexer->lookahead) || lexer->lookahead == '_') {
is_number = false;
advance(lexer);
} else {
return false;
}
for (;;) {
if (iswdigit(lexer->lookahead)) {
advance(lexer);
} else if (iswalpha(lexer->lookahead) || lexer->lookahead == '_') {
is_number = false;
advance(lexer);
} else {
break;
}
}
if (is_number &&
valid_symbols[FILE_DESCRIPTOR] &&
(lexer->lookahead == '>' || lexer->lookahead == '<')) {
lexer->result_symbol = FILE_DESCRIPTOR;
return true;
}
if (valid_symbols[VARIABLE_NAME]) {
if (lexer->lookahead == '+') {
lexer->mark_end(lexer);
advance(lexer);
if (lexer->lookahead == '=') {
lexer->result_symbol = VARIABLE_NAME;
return true;
} else {
return false;
}
} else if (lexer->lookahead == '=' || lexer->lookahead == '[') {
lexer->result_symbol = VARIABLE_NAME;
return true;
}
}
return false;
}
if (valid_symbols[REGEX]) {
while (iswspace(lexer->lookahead)) skip(lexer);
if (
lexer->lookahead != '"' &&
lexer->lookahead != '\'' &&
lexer->lookahead != '$'
) {
struct State {
bool done;
uint32_t paren_depth;
uint32_t bracket_depth;
uint32_t brace_depth;
};
lexer->mark_end(lexer);
State state = {false, 0, 0, 0};
while (!state.done) {
switch (lexer->lookahead) {
case '\0':
return false;
case '(':
state.paren_depth++;
break;
case '[':
state.bracket_depth++;
break;
case '{':
state.brace_depth++;
break;
case ')':
if (state.paren_depth == 0) state.done = true;
state.paren_depth--;
break;
case ']':
if (state.bracket_depth == 0) state.done = true;
state.bracket_depth--;
break;
case '}':
if (state.brace_depth == 0) state.done = true;
state.brace_depth--;
break;
}
if (!state.done) {
bool was_space = iswspace(lexer->lookahead);
advance(lexer);
if (!was_space) lexer->mark_end(lexer);
}
}
lexer->result_symbol = REGEX;
return true;
}
}
return false;
}
string heredoc_delimiter;
bool heredoc_is_raw;
bool started_heredoc;
bool heredoc_allows_indent;
string current_leading_word;
};
}
extern "C" {
void *tree_sitter_bash_external_scanner_create() {
return new Scanner();
}
bool tree_sitter_bash_external_scanner_scan(void *payload, TSLexer *lexer,
const bool *valid_symbols) {
Scanner *scanner = static_cast<Scanner *>(payload);
return scanner->scan(lexer, valid_symbols);
}
unsigned tree_sitter_bash_external_scanner_serialize(void *payload, char *state) {
Scanner *scanner = static_cast<Scanner *>(payload);
return scanner->serialize(state);
}
void tree_sitter_bash_external_scanner_deserialize(void *payload, const char *state, unsigned length) {
Scanner *scanner = static_cast<Scanner *>(payload);
scanner->deserialize(state, length);
}
void tree_sitter_bash_external_scanner_destroy(void *payload) {
Scanner *scanner = static_cast<Scanner *>(payload);
delete scanner;
}
}