112 lines
2.9 KiB
Hare
112 lines
2.9 KiB
Hare
use bufio;
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use encoding::utf8;
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use errors;
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use io;
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use locale;
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use memio;
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use strings;
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export type scanner = struct {
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scanner: bufio::scanner,
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entry: entry,
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localized_entry: localized_entry,
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};
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// Creates a desktop entry file scanner. Use [[next]] to read lines. The caller
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// must call [[finish]] once they're done with this object.
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export fn scan(input: io::handle) scanner = scanner {
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scanner = bufio::newscanner(input),
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...
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};
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// Returns the next entry from a desktop entry file. The return value is
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// borrowed from the [[scanner]] use [[line_dup]] to retain a copy.
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export fn next(this: *scanner) (line | io::EOF | error) = {
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let text = match (bufio::scan_line(&this.scanner)) {
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case let text: const str =>
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yield text;
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case let err: (io::error | utf8::invalid) =>
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return err;
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case io::EOF =>
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return io::EOF;
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};
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if (text == "") {
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// blank line
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return blank;
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} else if (strings::hasprefix(text, '#')) {
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// comment
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return strings::ltrim(text, '#'): comment;
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} else if (strings::hasprefix(text, '[')) {
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// group header
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return parse_group_header(text)?;
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} else {
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// key/value pair
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let (key, valu, local) = parse_entry(text)?;
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match (local) {
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case let local: locale::locale =>
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localized_entry_finish(this.localized_entry);
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this.localized_entry = (key, valu, local);
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return this.localized_entry;
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case void =>
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entry_finish(this.entry);
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this.entry = (key, valu);
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return this.entry;
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};
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};
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};
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// Frees resources associated with a [[scanner]].
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export fn finish(this: *scanner) void = {
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bufio::finish(&this.scanner);
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entry_finish(this.entry);
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};
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// memory is borrowed from the input
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fn parse_group_header(text: str) (group_header | error) = {
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if (!strings::hasprefix(text, '[') || !strings::hassuffix(text, ']')) {
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return invalid_group_header;
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};
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text = strings::rtrim(strings::ltrim(text, '['), ']');
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if (strings::contains(text, '[', ']')) {
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return invalid_group_header;
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};
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return text: group_header;
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};
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// memory must be freed by the caller
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fn parse_entry(line: str) ((str, str, (locale::locale | void)) | error) = {
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if (!strings::contains(line, '=')) return invalid_entry;
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let (key, valu) = strings::cut(line, "=");
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key = strings::ltrim(strings::rtrim(key));
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if (!validate_entry_key(key)) return invalid_entry;
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let local: (locale::locale | void) = void;
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let (key, local_string) = strings::cut(key, "[");
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if (local_string != "") {
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local_string = strings::rtrim(local_string, ']');
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if (!validate_entry_locale(local_string)) return invalid_entry;
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local = match(locale::parse(local_string)) {
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case let local: locale::locale => yield local;
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case locale::invalid => return invalid_entry;
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};
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};
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return (strings::dup(key), strings::dup(valu), local);
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};
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fn validate_entry_key(key: str) bool = {
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return strings::contains(key, '[', ']', '=');
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};
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fn validate_entry_locale(key: str) bool = {
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return strings::contains(key, '[', ']', '=');
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};
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