Make desktop_entry module more similar to ini module
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8521320a7c
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@ -1,20 +1,6 @@
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use locale;
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use strings;
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// Represents a file of the generic key/value format used by desktop entries.
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// Specification: §3
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export type file = struct {
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preceeding_lines: []line,
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groups: []group,
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};
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// A named group of key/value entries.
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// Specification: §3.2
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export type group = struct {
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name: str,
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lines: []line,
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};
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// A line in the file, which can be a comment (or a blank line), an entry, or
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// a localized entry.
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export type line = (blank | comment | entry | localized_entry);
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@ -27,195 +13,39 @@ export type blank = void;
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// Specification: §3.1
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export type comment = str;
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// A group header.
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// Specification: §3.2
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export type group_header = str;
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// A key/value pair.
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// Specification: §3.3
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export type entry = struct {
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key: str,
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value: str,
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};
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export type entry = (str, str);
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// A localized key/value pair.
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// Specification: §5
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export type localized_entry = struct {
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key: str,
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value: str,
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locale: locale::locale,
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export type localized_entry = (str, str, locale::locale);
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// Duplicates an [[entry]]. Use [[entry_finish]] to get rid of it.
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export fn entry_dup(entr: entry) entry = (
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strings::dup(entr.0),
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strings::dup(entr.1));
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// Frees memory associated with an [[entry]].
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export fn entry_finish(entr: entry) void = {
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free(entr.0);
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free(entr.1);
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};
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// Gets a non-localized [[value]] from a [[file]]. If the group does not exist,
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// or the group exists but the key isn't in it, it returns void.
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export fn file_get(fil: *file, group_name: str, key: str) (str | void) = {
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let grou = match (file_find_group(fil, group_name)) {
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case let index: size => yield fil.groups[index];
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case void => return void;
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};
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let lin = match (group_find_entry(grou, key)) {
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case let index: size => yield grou.lines[index];
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case void => return void;
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};
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match (lin) {
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case let entr: entry => return entr.value;
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case => abort();
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};
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};
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// Gets a localized [[value]] from a [[file]]. If the group does not exist, or
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// the group exists but the key isnt in it, it returns void. If the key is in
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// the group but is not localized to the specified [[locale::locale]], the
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// non-localized value is returned. Refer to the specification for the exact way
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// which the locale is matched.
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// Specification: §5
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export fn file_get_localized(
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fil: *file,
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group_name: str,
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key: str,
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local: locale::locale,
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) (str | void) = {
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let grou = match (file_find_group(fil, group_name)) {
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case let index: size => yield fil.groups[index];
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case void => return void;
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};
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let lin = match (group_find_localized_entry(grou, key, local)) {
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case let index: size => yield grou.lines[index];
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case void =>
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yield match(group_find_entry(grou, key)) {
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case let index: size => yield index;
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case void => return void;
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};
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};
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match (lin) {
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case let entr: localized_entry => return entr.value;
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case let entr: entry => return entr.value;
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case => abort();
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};
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};
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// TODO
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//export fn file_add
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//export fn file_add_localized
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//export fn file_remove
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//export fn file_remove_localized
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//export fn file_encode
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// Frees memory associated with a [[file]].
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export fn file_finish(fil: *file) void = {
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for (let lin .. fil.preceeding_lines) {
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line_finish(lin);
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};
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free(fil.preceeding_lines);
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for (let grou .. fil.groups) {
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group_finish(grou);
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};
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free(fil.groups);
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};
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// Frees memory associated with a [[line]].
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export fn line_finish(lin: line) void = match (lin) {
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case let lin: comment =>
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free(lin);
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case let lin: entry =>
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free(lin.key);
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free(lin.value);
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case let lin: localized_entry =>
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free(lin.key);
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free(lin.value);
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locale::finish(lin.locale);
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case => void;
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};
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// Frees memory associated with a [[group]].
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export fn group_finish(grou: group) void = {
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for (let lin .. grou.lines) {
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line_finish(lin);
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};
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free(grou.lines);
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};
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fn file_find_group(fil: *file, group_name: str) (size | void) = {
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let index = 0z;
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for (let grou .. fil.groups) {
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if (grou.name == group_name) {
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return index;
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};
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index += 1;
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};
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};
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fn group_find_entry(grou: group, key: str) (size | void) = {
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let index = 0z;
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for (let lin .. grou.lines) {
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match (lin) {
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case let entr: entry =>
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if (entr.key == key) {
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return index;
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};
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case => void;
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};
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index += 1;
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};
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};
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fn group_find_localized_entry(grou: group, key: str, local: locale::locale) (size | void) = {
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// The matching is done as follows. If LC_MESSAGES is of the form
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// lang_COUNTRY.ENCODING@MODIFIER, then it will match a key of the form
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// lang_COUNTRY@MODIFIER. If such a key does not exist, it will attempt
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// to match lang_COUNTRY followed by lang@MODIFIER. Then, a match
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// against lang by itself will be attempted. Finally, if no matching
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// key is found the required key without a locale specified is used.
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// The encoding from the LC_MESSAGES value is ignored when matching.
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//
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// If LC_MESSAGES does not have a MODIFIER field, then no key with a
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// modifier will be matched. Similarly, if LC_MESSAGES does not have a
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// COUNTRY field, then no key with a country specified will be matched.
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// If LC_MESSAGES just has a lang field, then it will do a straight
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// match to a key with a similar value.
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let lang_country_modifier = local;
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lang_country_modifier.encoding = "";
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match(group_find_localized_entry_exact(grou, key, lang_country_modifier)) {
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case let index: size => return index;
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case => void;
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};
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let lang_country = lang_country_modifier;
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lang_country.modifier = "";
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match(group_find_localized_entry_exact(grou, key, lang_country)) {
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case let index: size => return index;
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case => void;
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};
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let lang_modifier = lang_country_modifier;
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lang_modifier.country = "";
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match(group_find_localized_entry_exact(grou, key, lang_modifier)) {
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case let index: size => return index;
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case => void;
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};
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let lang = lang_modifier;
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lang.modifier = "";
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match(group_find_localized_entry_exact(grou, key, lang)) {
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case let index: size => return index;
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case => void;
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};
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return void;
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};
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fn group_find_localized_entry_exact(grou: group, key: str, local: locale::locale) (size | void) = {
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let index = 0z;
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for (let lin .. grou.lines) {
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match (lin) {
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case let entr: localized_entry =>
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if (entr.key == key && locale::equal(entr.locale, local)) {
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return index;
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};
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case => void;
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};
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index += 1;
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};
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// Duplicates a [[localized_entry]]. Use [[localized_entry_finish]] to get rid
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// of it.
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export fn localized_entry_dup(entr: localized_entry) localized_entry = (
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strings::dup(entr.0),
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strings::dup(entr.1),
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locale::dup(entr.2));
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// Frees memory associated with an [[localized_entry]].
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export fn localized_entry_finish(entr: localized_entry) void = {
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free(entr.0);
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free(entr.1);
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locale::finish(entr.2);
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};
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@ -1,5 +1,11 @@
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// All errors defined in this module.
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export type error = !(
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use encoding::utf8;
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use io;
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// Any error that may occur during parsing.
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export type error = !(syntaxerr | io::error | utf8::invalid);
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// All syntax errors defined in this module.
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export type syntaxerr = !(
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invalid_group_header |
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invalid_entry |
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invalid_ascii |
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@ -24,4 +30,6 @@ case invalid_group_header => yield "invalid group header";
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case invalid_entry => yield "invalid entry";
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case invalid_ascii => yield "invalid ascii";
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case invalid_escape => yield "invalid escape";
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case let err: io::error => yield io::strerror(err);
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case let err: utf8::invalid => yield utf8::strerror(err);
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};
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@ -6,83 +6,69 @@ use locale;
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use memio;
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use strings;
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// Parses a [[file]]. The result must be freed using [[file_finish]].
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export fn file_parse(in: io::stream) !(file | error | io::error | utf8::invalid) = {
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let scanner = bufio::newscanner(&in);
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defer bufio::finish(&scanner);
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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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let fil = file { ... };
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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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for (true) {
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let text = match (bufio::scan_line(&scanner)) {
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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::EOF =>
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break;
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case let err: (io::error | utf8::invalid) =>
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file_finish(&fil);
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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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file_append_line(&fil, blank);
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return blank;
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} else if (strings::hasprefix(text, '#')) {
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// comment
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let text = strings::dup(strings::ltrim(text, '#'));
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file_append_line(&fil, text: 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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let name = strings::dup(parse_group_header(text)?);
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file_append_group(&fil, name);
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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) = match (parse_entry(text)) {
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case let result: (str, str, (locale::locale | void)) =>
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yield result;
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case let err: error =>
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file_finish(&fil);
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return err;
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};
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let (key, valu, local) = parse_entry(text)?;
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file_append_line(&fil, match (local) {
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match (local) {
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case let local: locale::locale =>
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yield localized_entry {
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key = key,
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value = valu,
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locale = local,
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};
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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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yield entry {
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key = key,
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value = valu,
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};
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});
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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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return fil;
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};
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fn file_append_group(fil: *file, name: str) void = {
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append(fil.groups, group {
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name = name,
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...
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});
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};
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fn file_append_line(fil: *file, lin: line) void = {
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if (len(fil.groups) > 0) {
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append(fil.groups[len(fil.groups) - 1].lines, lin);
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} else {
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append(fil.preceeding_lines, lin);
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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) (str | error) = {
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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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@ -91,7 +77,7 @@ fn parse_group_header(text: str) (str | error) = {
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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;
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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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