400 lines
14 KiB
JavaScript
400 lines
14 KiB
JavaScript
/**
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* Tokenize input string.
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*/
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function lexer(str) {
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var tokens = [];
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var i = 0;
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while (i < str.length) {
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var char = str[i];
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if (char === "*" || char === "+" || char === "?") {
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tokens.push({ type: "MODIFIER", index: i, value: str[i++] });
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continue;
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}
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if (char === "\\") {
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tokens.push({ type: "ESCAPED_CHAR", index: i++, value: str[i++] });
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continue;
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}
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if (char === "{") {
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tokens.push({ type: "OPEN", index: i, value: str[i++] });
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continue;
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}
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if (char === "}") {
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tokens.push({ type: "CLOSE", index: i, value: str[i++] });
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continue;
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}
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if (char === ":") {
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var name = "";
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var j = i + 1;
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while (j < str.length) {
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var code = str.charCodeAt(j);
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if (
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// `0-9`
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(code >= 48 && code <= 57) ||
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// `A-Z`
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(code >= 65 && code <= 90) ||
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// `a-z`
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(code >= 97 && code <= 122) ||
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// `_`
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code === 95) {
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name += str[j++];
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continue;
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}
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break;
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}
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if (!name)
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throw new TypeError("Missing parameter name at ".concat(i));
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tokens.push({ type: "NAME", index: i, value: name });
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i = j;
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continue;
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}
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if (char === "(") {
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var count = 1;
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var pattern = "";
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var j = i + 1;
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if (str[j] === "?") {
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throw new TypeError("Pattern cannot start with \"?\" at ".concat(j));
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}
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while (j < str.length) {
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if (str[j] === "\\") {
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pattern += str[j++] + str[j++];
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continue;
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}
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if (str[j] === ")") {
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count--;
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if (count === 0) {
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j++;
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break;
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}
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}
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else if (str[j] === "(") {
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count++;
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if (str[j + 1] !== "?") {
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throw new TypeError("Capturing groups are not allowed at ".concat(j));
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}
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}
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pattern += str[j++];
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}
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if (count)
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throw new TypeError("Unbalanced pattern at ".concat(i));
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if (!pattern)
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throw new TypeError("Missing pattern at ".concat(i));
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tokens.push({ type: "PATTERN", index: i, value: pattern });
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i = j;
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continue;
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}
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tokens.push({ type: "CHAR", index: i, value: str[i++] });
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}
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tokens.push({ type: "END", index: i, value: "" });
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return tokens;
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}
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/**
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* Parse a string for the raw tokens.
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*/
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export function parse(str, options) {
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if (options === void 0) { options = {}; }
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var tokens = lexer(str);
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var _a = options.prefixes, prefixes = _a === void 0 ? "./" : _a;
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var defaultPattern = "[^".concat(escapeString(options.delimiter || "/#?"), "]+?");
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var result = [];
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var key = 0;
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var i = 0;
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var path = "";
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var tryConsume = function (type) {
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if (i < tokens.length && tokens[i].type === type)
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return tokens[i++].value;
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};
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var mustConsume = function (type) {
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var value = tryConsume(type);
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if (value !== undefined)
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return value;
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var _a = tokens[i], nextType = _a.type, index = _a.index;
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throw new TypeError("Unexpected ".concat(nextType, " at ").concat(index, ", expected ").concat(type));
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};
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var consumeText = function () {
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var result = "";
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var value;
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while ((value = tryConsume("CHAR") || tryConsume("ESCAPED_CHAR"))) {
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result += value;
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}
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return result;
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};
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while (i < tokens.length) {
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var char = tryConsume("CHAR");
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var name = tryConsume("NAME");
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var pattern = tryConsume("PATTERN");
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if (name || pattern) {
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var prefix = char || "";
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if (prefixes.indexOf(prefix) === -1) {
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path += prefix;
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prefix = "";
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}
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if (path) {
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result.push(path);
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path = "";
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}
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result.push({
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name: name || key++,
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prefix: prefix,
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suffix: "",
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pattern: pattern || defaultPattern,
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modifier: tryConsume("MODIFIER") || "",
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});
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continue;
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}
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var value = char || tryConsume("ESCAPED_CHAR");
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if (value) {
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path += value;
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continue;
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}
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if (path) {
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result.push(path);
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path = "";
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}
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var open = tryConsume("OPEN");
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if (open) {
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var prefix = consumeText();
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var name_1 = tryConsume("NAME") || "";
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var pattern_1 = tryConsume("PATTERN") || "";
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var suffix = consumeText();
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mustConsume("CLOSE");
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result.push({
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name: name_1 || (pattern_1 ? key++ : ""),
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pattern: name_1 && !pattern_1 ? defaultPattern : pattern_1,
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prefix: prefix,
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suffix: suffix,
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modifier: tryConsume("MODIFIER") || "",
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});
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continue;
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}
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mustConsume("END");
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}
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return result;
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}
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/**
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* Compile a string to a template function for the path.
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*/
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export function compile(str, options) {
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return tokensToFunction(parse(str, options), options);
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}
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/**
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* Expose a method for transforming tokens into the path function.
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*/
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export function tokensToFunction(tokens, options) {
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if (options === void 0) { options = {}; }
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var reFlags = flags(options);
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var _a = options.encode, encode = _a === void 0 ? function (x) { return x; } : _a, _b = options.validate, validate = _b === void 0 ? true : _b;
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// Compile all the tokens into regexps.
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var matches = tokens.map(function (token) {
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if (typeof token === "object") {
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return new RegExp("^(?:".concat(token.pattern, ")$"), reFlags);
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}
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});
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return function (data) {
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var path = "";
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for (var i = 0; i < tokens.length; i++) {
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var token = tokens[i];
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if (typeof token === "string") {
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path += token;
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continue;
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}
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var value = data ? data[token.name] : undefined;
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var optional = token.modifier === "?" || token.modifier === "*";
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var repeat = token.modifier === "*" || token.modifier === "+";
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if (Array.isArray(value)) {
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if (!repeat) {
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throw new TypeError("Expected \"".concat(token.name, "\" to not repeat, but got an array"));
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}
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if (value.length === 0) {
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if (optional)
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continue;
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throw new TypeError("Expected \"".concat(token.name, "\" to not be empty"));
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}
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for (var j = 0; j < value.length; j++) {
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var segment = encode(value[j], token);
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if (validate && !matches[i].test(segment)) {
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throw new TypeError("Expected all \"".concat(token.name, "\" to match \"").concat(token.pattern, "\", but got \"").concat(segment, "\""));
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}
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path += token.prefix + segment + token.suffix;
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}
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continue;
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}
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if (typeof value === "string" || typeof value === "number") {
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var segment = encode(String(value), token);
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if (validate && !matches[i].test(segment)) {
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throw new TypeError("Expected \"".concat(token.name, "\" to match \"").concat(token.pattern, "\", but got \"").concat(segment, "\""));
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}
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path += token.prefix + segment + token.suffix;
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continue;
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}
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if (optional)
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continue;
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var typeOfMessage = repeat ? "an array" : "a string";
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throw new TypeError("Expected \"".concat(token.name, "\" to be ").concat(typeOfMessage));
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}
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return path;
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};
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}
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/**
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* Create path match function from `path-to-regexp` spec.
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*/
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export function match(str, options) {
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var keys = [];
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var re = pathToRegexp(str, keys, options);
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return regexpToFunction(re, keys, options);
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}
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/**
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* Create a path match function from `path-to-regexp` output.
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*/
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export function regexpToFunction(re, keys, options) {
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if (options === void 0) { options = {}; }
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var _a = options.decode, decode = _a === void 0 ? function (x) { return x; } : _a;
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return function (pathname) {
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var m = re.exec(pathname);
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if (!m)
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return false;
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var path = m[0], index = m.index;
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var params = Object.create(null);
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var _loop_1 = function (i) {
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if (m[i] === undefined)
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return "continue";
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var key = keys[i - 1];
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if (key.modifier === "*" || key.modifier === "+") {
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params[key.name] = m[i].split(key.prefix + key.suffix).map(function (value) {
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return decode(value, key);
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});
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}
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else {
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params[key.name] = decode(m[i], key);
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}
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};
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for (var i = 1; i < m.length; i++) {
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_loop_1(i);
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}
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return { path: path, index: index, params: params };
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};
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}
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/**
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* Escape a regular expression string.
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*/
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function escapeString(str) {
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return str.replace(/([.+*?=^!:${}()[\]|/\\])/g, "\\$1");
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}
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/**
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* Get the flags for a regexp from the options.
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*/
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function flags(options) {
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return options && options.sensitive ? "" : "i";
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}
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/**
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* Pull out keys from a regexp.
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*/
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function regexpToRegexp(path, keys) {
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if (!keys)
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return path;
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var groupsRegex = /\((?:\?<(.*?)>)?(?!\?)/g;
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var index = 0;
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var execResult = groupsRegex.exec(path.source);
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while (execResult) {
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keys.push({
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// Use parenthesized substring match if available, index otherwise
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name: execResult[1] || index++,
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prefix: "",
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suffix: "",
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modifier: "",
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pattern: "",
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});
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execResult = groupsRegex.exec(path.source);
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}
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return path;
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}
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/**
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* Transform an array into a regexp.
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*/
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function arrayToRegexp(paths, keys, options) {
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var parts = paths.map(function (path) { return pathToRegexp(path, keys, options).source; });
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return new RegExp("(?:".concat(parts.join("|"), ")"), flags(options));
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}
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/**
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* Create a path regexp from string input.
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*/
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function stringToRegexp(path, keys, options) {
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return tokensToRegexp(parse(path, options), keys, options);
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}
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/**
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* Expose a function for taking tokens and returning a RegExp.
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*/
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export function tokensToRegexp(tokens, keys, options) {
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if (options === void 0) { options = {}; }
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var _a = options.strict, strict = _a === void 0 ? false : _a, _b = options.start, start = _b === void 0 ? true : _b, _c = options.end, end = _c === void 0 ? true : _c, _d = options.encode, encode = _d === void 0 ? function (x) { return x; } : _d, _e = options.delimiter, delimiter = _e === void 0 ? "/#?" : _e, _f = options.endsWith, endsWith = _f === void 0 ? "" : _f;
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var endsWithRe = "[".concat(escapeString(endsWith), "]|$");
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var delimiterRe = "[".concat(escapeString(delimiter), "]");
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var route = start ? "^" : "";
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// Iterate over the tokens and create our regexp string.
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for (var _i = 0, tokens_1 = tokens; _i < tokens_1.length; _i++) {
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var token = tokens_1[_i];
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if (typeof token === "string") {
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route += escapeString(encode(token));
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}
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else {
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var prefix = escapeString(encode(token.prefix));
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var suffix = escapeString(encode(token.suffix));
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if (token.pattern) {
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if (keys)
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keys.push(token);
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if (prefix || suffix) {
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if (token.modifier === "+" || token.modifier === "*") {
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var mod = token.modifier === "*" ? "?" : "";
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route += "(?:".concat(prefix, "((?:").concat(token.pattern, ")(?:").concat(suffix).concat(prefix, "(?:").concat(token.pattern, "))*)").concat(suffix, ")").concat(mod);
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}
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else {
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route += "(?:".concat(prefix, "(").concat(token.pattern, ")").concat(suffix, ")").concat(token.modifier);
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}
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}
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else {
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if (token.modifier === "+" || token.modifier === "*") {
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route += "((?:".concat(token.pattern, ")").concat(token.modifier, ")");
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}
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else {
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route += "(".concat(token.pattern, ")").concat(token.modifier);
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}
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}
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}
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else {
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route += "(?:".concat(prefix).concat(suffix, ")").concat(token.modifier);
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}
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}
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}
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if (end) {
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if (!strict)
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route += "".concat(delimiterRe, "?");
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route += !options.endsWith ? "$" : "(?=".concat(endsWithRe, ")");
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}
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else {
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var endToken = tokens[tokens.length - 1];
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var isEndDelimited = typeof endToken === "string"
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? delimiterRe.indexOf(endToken[endToken.length - 1]) > -1
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: endToken === undefined;
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if (!strict) {
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route += "(?:".concat(delimiterRe, "(?=").concat(endsWithRe, "))?");
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}
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if (!isEndDelimited) {
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route += "(?=".concat(delimiterRe, "|").concat(endsWithRe, ")");
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}
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}
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return new RegExp(route, flags(options));
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}
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/**
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* Normalize the given path string, returning a regular expression.
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*
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* An empty array can be passed in for the keys, which will hold the
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* placeholder key descriptions. For example, using `/user/:id`, `keys` will
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* contain `[{ name: 'id', delimiter: '/', optional: false, repeat: false }]`.
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*/
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export function pathToRegexp(path, keys, options) {
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if (path instanceof RegExp)
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return regexpToRegexp(path, keys);
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if (Array.isArray(path))
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return arrayToRegexp(path, keys, options);
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return stringToRegexp(path, keys, options);
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}
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//# sourceMappingURL=index.js.map
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