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- 'use strict';
-
- const { tokenChars } = require('./validation');
-
-
- function push(dest, name, elem) {
- if (dest[name] === undefined) dest[name] = [elem];
- else dest[name].push(elem);
- }
-
-
- function parse(header) {
- const offers = Object.create(null);
- let params = Object.create(null);
- let mustUnescape = false;
- let isEscaping = false;
- let inQuotes = false;
- let extensionName;
- let paramName;
- let start = -1;
- let code = -1;
- let end = -1;
- let i = 0;
-
- for (; i < header.length; i++) {
- code = header.charCodeAt(i);
-
- if (extensionName === undefined) {
- if (end === -1 && tokenChars[code] === 1) {
- if (start === -1) start = i;
- } else if (
- i !== 0 &&
- (code === 0x20 || code === 0x09)
- ) {
- if (end === -1 && start !== -1) end = i;
- } else if (code === 0x3b || code === 0x2c ) {
- if (start === -1) {
- throw new SyntaxError(`Unexpected character at index ${i}`);
- }
-
- if (end === -1) end = i;
- const name = header.slice(start, end);
- if (code === 0x2c) {
- push(offers, name, params);
- params = Object.create(null);
- } else {
- extensionName = name;
- }
-
- start = end = -1;
- } else {
- throw new SyntaxError(`Unexpected character at index ${i}`);
- }
- } else if (paramName === undefined) {
- if (end === -1 && tokenChars[code] === 1) {
- if (start === -1) start = i;
- } else if (code === 0x20 || code === 0x09) {
- if (end === -1 && start !== -1) end = i;
- } else if (code === 0x3b || code === 0x2c) {
- if (start === -1) {
- throw new SyntaxError(`Unexpected character at index ${i}`);
- }
-
- if (end === -1) end = i;
- push(params, header.slice(start, end), true);
- if (code === 0x2c) {
- push(offers, extensionName, params);
- params = Object.create(null);
- extensionName = undefined;
- }
-
- start = end = -1;
- } else if (code === 0x3d && start !== -1 && end === -1) {
- paramName = header.slice(start, i);
- start = end = -1;
- } else {
- throw new SyntaxError(`Unexpected character at index ${i}`);
- }
- } else {
-
-
-
-
-
- if (isEscaping) {
- if (tokenChars[code] !== 1) {
- throw new SyntaxError(`Unexpected character at index ${i}`);
- }
- if (start === -1) start = i;
- else if (!mustUnescape) mustUnescape = true;
- isEscaping = false;
- } else if (inQuotes) {
- if (tokenChars[code] === 1) {
- if (start === -1) start = i;
- } else if (code === 0x22 && start !== -1) {
- inQuotes = false;
- end = i;
- } else if (code === 0x5c ) {
- isEscaping = true;
- } else {
- throw new SyntaxError(`Unexpected character at index ${i}`);
- }
- } else if (code === 0x22 && header.charCodeAt(i - 1) === 0x3d) {
- inQuotes = true;
- } else if (end === -1 && tokenChars[code] === 1) {
- if (start === -1) start = i;
- } else if (start !== -1 && (code === 0x20 || code === 0x09)) {
- if (end === -1) end = i;
- } else if (code === 0x3b || code === 0x2c) {
- if (start === -1) {
- throw new SyntaxError(`Unexpected character at index ${i}`);
- }
-
- if (end === -1) end = i;
- let value = header.slice(start, end);
- if (mustUnescape) {
- value = value.replace(/\\/g, '');
- mustUnescape = false;
- }
- push(params, paramName, value);
- if (code === 0x2c) {
- push(offers, extensionName, params);
- params = Object.create(null);
- extensionName = undefined;
- }
-
- paramName = undefined;
- start = end = -1;
- } else {
- throw new SyntaxError(`Unexpected character at index ${i}`);
- }
- }
- }
-
- if (start === -1 || inQuotes || code === 0x20 || code === 0x09) {
- throw new SyntaxError('Unexpected end of input');
- }
-
- if (end === -1) end = i;
- const token = header.slice(start, end);
- if (extensionName === undefined) {
- push(offers, token, params);
- } else {
- if (paramName === undefined) {
- push(params, token, true);
- } else if (mustUnescape) {
- push(params, paramName, token.replace(/\\/g, ''));
- } else {
- push(params, paramName, token);
- }
- push(offers, extensionName, params);
- }
-
- return offers;
- }
-
-
- function format(extensions) {
- return Object.keys(extensions)
- .map((extension) => {
- let configurations = extensions[extension];
- if (!Array.isArray(configurations)) configurations = [configurations];
- return configurations
- .map((params) => {
- return [extension]
- .concat(
- Object.keys(params).map((k) => {
- let values = params[k];
- if (!Array.isArray(values)) values = [values];
- return values
- .map((v) => (v === true ? k : `${k}=${v}`))
- .join('; ');
- })
- )
- .join('; ');
- })
- .join(', ');
- })
- .join(', ');
- }
-
- module.exports = { format, parse };
|