77 lines
2.7 KiB
JavaScript
77 lines
2.7 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.reconstruct = void 0;
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const types_1 = require("./types");
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const write_set_tokens_1 = require("./write-set-tokens");
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const reduceStack = (stack) => stack.map(exports.reconstruct).join('');
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const createAlternate = (token) => {
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if ('options' in token) {
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return token.options.map(reduceStack).join('|');
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}
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else if ('stack' in token) {
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return reduceStack(token.stack);
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}
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else {
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throw new Error(`options or stack must be Root or Group token`);
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}
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};
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exports.reconstruct = (token) => {
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switch (token.type) {
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case types_1.types.ROOT:
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return createAlternate(token);
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case types_1.types.CHAR: {
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const c = String.fromCharCode(token.value);
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// Note that the escaping for characters inside classes is handled
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// in the write-set-tokens module so '-' and ']' are not escaped here
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return (/[[\\{}$^.|?*+()]/.test(c) ? '\\' : '') + c;
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}
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case types_1.types.POSITION:
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if (token.value === '^' || token.value === '$') {
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return token.value;
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}
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else {
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return `\\${token.value}`;
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}
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case types_1.types.REFERENCE:
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return `\\${token.value}`;
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case types_1.types.SET:
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return write_set_tokens_1.writeSetTokens(token);
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case types_1.types.GROUP: {
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// Check token.remember
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const prefix = token.name ? `?<${token.name}>` :
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token.remember ? '' :
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token.followedBy ? '?=' :
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token.notFollowedBy ? '?!' :
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'?:';
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return `(${prefix}${createAlternate(token)})`;
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}
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case types_1.types.REPETITION: {
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const { min, max } = token;
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let endWith;
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if (min === 0 && max === 1) {
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endWith = '?';
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}
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else if (min === 1 && max === Infinity) {
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endWith = '+';
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}
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else if (min === 0 && max === Infinity) {
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endWith = '*';
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}
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else if (max === Infinity) {
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endWith = `{${min},}`;
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}
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else if (min === max) {
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endWith = `{${min}}`;
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}
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else {
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endWith = `{${min},${max}}`;
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}
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return `${exports.reconstruct(token.value)}${endWith}`;
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}
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case types_1.types.RANGE:
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return `${write_set_tokens_1.setChar(token.from)}-${write_set_tokens_1.setChar(token.to)}`;
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default:
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throw new Error(`Invalid token type ${token}`);
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}
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};
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//# sourceMappingURL=reconstruct.js.map
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