Marc Mintel
5397309103
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269 lines
11 KiB
Plaintext
269 lines
11 KiB
Plaintext
class POParser {
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static parse(content) {
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const lines = POParser.splitLines(content);
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const messages = [];
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const meta = {};
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let state = 'entry';
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let entry;
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for(let i = 0; i < lines.length; i++){
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const line = lines[i].trim();
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// An empty line indicates the end of an entry
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if (!line) {
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if (state === 'entry' && entry) {
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messages.push(POParser.finishEntry(entry));
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entry = undefined;
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}
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state = 'entry';
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continue;
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}
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if (state === 'meta') {
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if (line.startsWith(POParser.QUOTE)) {
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const rawMetaLine = POParser.extractQuotedString(line, state);
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const metaLine = POParser.unescape(rawMetaLine);
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const cleaned = metaLine.endsWith('\n') ? metaLine.slice(0, -1) : metaLine;
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const separatorIndex = cleaned.indexOf(POParser.META_SEPARATOR);
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if (separatorIndex > 0) {
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const key = cleaned.substring(0, separatorIndex).trim();
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const value = cleaned.substring(separatorIndex + 1).trim();
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meta[key] = value;
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}
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} else {
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POParser.throwWithLine('Encountered unexpected non-quoted metadata line', line);
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}
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} else {
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// Unsupported comment types
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if (POParser.lineStartsWithPrefix(line, POParser.COMMENTS.TRANSLATOR)) {
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POParser.throwWithLine('Translator comments (#) are not supported, use inline descriptions instead', line);
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}
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if (POParser.lineStartsWithPrefix(line, POParser.COMMENTS.PREVIOUS)) {
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POParser.throwWithLine('Previous string key comments (#|) are not supported', line);
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}
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// Flag comments
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if (POParser.lineStartsWithPrefix(line, POParser.COMMENTS.FLAG)) {
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entry = POParser.ensureEntry(entry);
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const flagsText = line.substring(POParser.COMMENTS.FLAG.length).trim();
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entry.flags = flagsText.split(',').map((flag)=>flag.trim()).filter(Boolean);
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continue;
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}
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// Reference comments
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if (POParser.lineStartsWithPrefix(line, POParser.COMMENTS.REFERENCE)) {
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var _entry;
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entry = POParser.ensureEntry(entry);
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const parts = line.substring(POParser.COMMENTS.REFERENCE.length).trim().split(POParser.FILE_COLUMN_SEPARATOR);
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const path = parts[0];
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let lineNumber;
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if (parts.length > 1) {
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const parsedLine = parseInt(parts[1]);
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if (!isNaN(parsedLine)) {
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lineNumber = parsedLine;
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}
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}
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(_entry = entry).references ?? (_entry.references = []);
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const reference = {
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path
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};
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if (lineNumber) {
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reference.line = lineNumber;
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}
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entry.references.push(reference);
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continue;
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}
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// Extracted comments
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if (POParser.lineStartsWithPrefix(line, POParser.COMMENTS.EXTRACTED)) {
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var _entry1;
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entry = POParser.ensureEntry(entry);
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const comment = line.substring(POParser.COMMENTS.EXTRACTED.length).trim();
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(_entry1 = entry).extractedComments ?? (_entry1.extractedComments = []);
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entry.extractedComments.push(comment);
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continue;
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}
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// Check for unsupported features
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if (POParser.lineStartsWithPrefix(line, POParser.KEYWORDS.MSGID_PLURAL)) {
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POParser.throwWithLine('Plural forms (msgid_plural) are not supported, use ICU pluralization instead', line);
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}
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// msgctxt
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if (POParser.lineStartsWithPrefix(line, POParser.KEYWORDS.MSGCTXT)) {
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entry = POParser.ensureEntry(entry);
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entry.msgctxt = POParser.unescape(POParser.extractQuotedString(line.substring(POParser.KEYWORDS.MSGCTXT.length + 1), state));
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continue;
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}
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// msgid
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if (POParser.lineStartsWithPrefix(line, POParser.KEYWORDS.MSGID)) {
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entry = POParser.ensureEntry(entry);
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entry.msgid = POParser.unescape(POParser.extractQuotedString(line.substring(POParser.KEYWORDS.MSGID.length + 1), state));
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if (POParser.isMetaEntry(entry, messages)) {
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state = 'meta';
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entry = undefined;
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}
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continue;
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}
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// msgstr
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if (POParser.lineStartsWithPrefix(line, POParser.KEYWORDS.MSGSTR)) {
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entry = POParser.ensureEntry(entry);
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entry.msgstr = POParser.unescape(POParser.extractQuotedString(line.substring(POParser.KEYWORDS.MSGSTR.length + 1), state));
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if (POParser.isMetaEntry(entry, messages)) {
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state = 'meta';
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entry = undefined;
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}
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continue;
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}
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// Multi-line strings are not supported in entry mode
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if (line.startsWith(POParser.QUOTE)) {
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POParser.throwWithLine('Multi-line strings are not supported, use single-line strings instead', line);
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}
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}
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}
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// Finish any remaining entry
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if (state === 'entry' && entry) {
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messages.push(POParser.finishEntry(entry));
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}
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return {
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meta: Object.keys(meta).length > 0 ? meta : undefined,
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messages: messages.length > 0 ? messages : undefined
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};
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}
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static isMetaEntry(entry, messages) {
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return messages.length === 0 && entry.msgid === '' && entry.msgstr === '';
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}
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static serialize(catalog) {
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const lines = [];
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// Metadata
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if (catalog.meta) {
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lines.push(`${POParser.KEYWORDS.MSGID} ${POParser.QUOTE}${POParser.QUOTE}`);
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lines.push(`${POParser.KEYWORDS.MSGSTR} ${POParser.QUOTE}${POParser.QUOTE}`);
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for (const [key, value] of Object.entries(catalog.meta)){
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lines.push(`${POParser.QUOTE}${key}${POParser.META_SEPARATOR} ${POParser.escape(value)}${POParser.NEWLINE}${POParser.QUOTE}`);
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}
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lines.push('');
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}
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// Messages
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if (catalog.messages) {
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for (const entry of catalog.messages){
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if (entry.extractedComments && entry.extractedComments.length > 0) {
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for (const comment of entry.extractedComments){
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lines.push(`${POParser.COMMENTS.EXTRACTED} ${comment}`);
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}
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}
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if (entry.references && entry.references.length > 0) {
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for (const ref of entry.references){
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let refString = ref.path;
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if (ref.line) {
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refString += `${POParser.FILE_COLUMN_SEPARATOR}${ref.line}`;
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}
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lines.push(`${POParser.COMMENTS.REFERENCE} ${refString}`);
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}
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}
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if (entry.flags && entry.flags.length > 0) {
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lines.push(`${POParser.COMMENTS.FLAG} ${entry.flags.join(POParser.FLAG_SEPARATOR)}`);
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}
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if (entry.msgctxt) {
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lines.push(`${POParser.KEYWORDS.MSGCTXT} ${POParser.QUOTE}${POParser.escape(entry.msgctxt)}${POParser.QUOTE}`);
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}
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lines.push(`${POParser.KEYWORDS.MSGID} ${POParser.QUOTE}${POParser.escape(entry.msgid)}${POParser.QUOTE}`);
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lines.push(`${POParser.KEYWORDS.MSGSTR} ${POParser.QUOTE}${POParser.escape(entry.msgstr)}${POParser.QUOTE}`);
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lines.push('');
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}
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}
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return lines.join('\n');
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}
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static lineStartsWithPrefix(line, prefix) {
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return line.startsWith(prefix + ' ');
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}
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static throwWithLine(message, line) {
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throw new Error(`${message}:\n> ${line}`);
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}
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static splitLines(content) {
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// Avoid overhead for Unix newlines only
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if (content.includes('\r')) {
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content = content.replace(/\r\n/g, '\n');
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}
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return content.split('\n');
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}
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static ensureEntry(entry) {
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return entry || {};
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}
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static finishEntry(entry) {
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if (entry.msgid == null || entry.msgstr == null) {
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throw new Error('Incomplete message entry: both msgid and msgstr are required');
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}
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return {
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msgctxt: entry.msgctxt,
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msgid: entry.msgid,
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msgstr: entry.msgstr,
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extractedComments: entry.extractedComments,
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references: entry.references,
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flags: entry.flags
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};
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}
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static extractQuotedString(line, state) {
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const trimmed = line.trim();
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if (!trimmed.startsWith(POParser.QUOTE)) {
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POParser.throwWithLine('Incomplete quoted string', line);
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}
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if (!trimmed.endsWith(POParser.QUOTE)) {
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if (state === 'meta') {
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return trimmed.substring(POParser.QUOTE.length);
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}
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POParser.throwWithLine('Incomplete quoted string', line);
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}
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const endIndex = trimmed.length - POParser.QUOTE.length;
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return trimmed.substring(POParser.QUOTE.length, endIndex);
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}
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static escape(value) {
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let result = '';
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for (const char of value){
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const mapped = POParser.ESCAPE_LOOKUP[char];
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result += mapped != null ? `\\${mapped}` : char;
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}
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return result;
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}
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static unescape(value) {
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let result = '';
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for(let i = 0; i < value.length; i++){
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const char = value[i];
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if (char === '\\' && i + 1 < value.length) {
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const nextChar = value[i + 1];
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const mapped = POParser.UNESCAPE_LOOKUP[nextChar];
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if (mapped != null) {
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result += mapped;
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i++;
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continue;
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}
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}
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result += char;
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}
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return result;
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}
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}
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POParser.KEYWORDS = {
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MSGID: 'msgid',
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MSGSTR: 'msgstr',
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MSGCTXT: 'msgctxt',
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MSGID_PLURAL: 'msgid_plural'
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};
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POParser.COMMENTS = {
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REFERENCE: '#:',
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EXTRACTED: '#.',
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TRANSLATOR: '#',
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FLAG: '#,',
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PREVIOUS: '#|'
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};
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POParser.QUOTE = '"';
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POParser.NEWLINE = '\\n';
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POParser.FILE_COLUMN_SEPARATOR = ':';
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POParser.META_SEPARATOR = ':';
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POParser.FLAG_SEPARATOR = ', ';
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POParser.ESCAPE_LOOKUP = {
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'\\': '\\',
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'"': '"',
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'\n': 'n',
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'\r': 'r',
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'\t': 't'
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};
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POParser.UNESCAPE_LOOKUP = Object.entries(POParser.ESCAPE_LOOKUP).reduce((acc, [char, code])=>{
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acc[code] = char;
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return acc;
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}, {});
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export { POParser as default };
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