89 lines
2.8 KiB
JavaScript
89 lines
2.8 KiB
JavaScript
import { token, remainingTokensNumber, map, flatten, parserPosition as parserPosition$1, tryParse as tryParse$1, match as match$1 } from './core.mjs';
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import { clamp, escapeWhitespace } from './util.mjs';
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function char(char) {
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return token((c) => (c === char) ? c : undefined);
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}
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function oneOf(chars) {
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return token((c) => (chars.includes(c)) ? c : undefined);
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}
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function noneOf(chars) {
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return token((c) => (chars.includes(c)) ? undefined : c);
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}
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function charTest(regex) {
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return token((c) => regex.test(c) ? c : undefined);
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}
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function str(str) {
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const len = str.length;
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return (data, i) => {
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const tokensNumber = remainingTokensNumber(data, i);
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let substr = '';
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let j = 0;
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while (j < tokensNumber && substr.length < len) {
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substr += data.tokens[i + j];
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j++;
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}
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return (substr === str)
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? {
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matched: true,
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position: i + j,
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value: str
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}
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: { matched: false };
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};
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}
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function concat(...ps) {
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return map(flatten(...ps), (vs) => vs.join(''));
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}
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function parserPosition(data, i, contextTokens = 11) {
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const len = data.tokens.length;
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const lowIndex = clamp(0, i - contextTokens, len - contextTokens);
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const highIndex = clamp(contextTokens, i + 1 + contextTokens, len);
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const tokensSlice = data.tokens.slice(lowIndex, highIndex);
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if (tokensSlice.some((t) => t.length !== 1)) {
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return parserPosition$1(data, i, (t) => t);
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}
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let line = '';
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let offset = 0;
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let markerLen = 1;
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if (i < 0) {
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line += ' ';
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}
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if (0 < lowIndex) {
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line += '...';
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}
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for (let j = 0; j < tokensSlice.length; j++) {
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const token = escapeWhitespace(tokensSlice[j]);
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if (lowIndex + j === i) {
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offset = line.length;
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markerLen = token.length;
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}
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line += token;
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}
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if (highIndex < len) {
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line += '...';
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}
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if (len <= i) {
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offset = line.length;
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}
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return `${''.padEnd(offset)}${i}\n${line}\n${''.padEnd(offset)}${'^'.repeat(markerLen)}`;
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}
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function parse(parser, str, options) {
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const data = { tokens: [...str], options: options };
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const result = parser(data, 0);
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if (!result.matched) {
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throw new Error('No match');
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}
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if (result.position < data.tokens.length) {
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throw new Error(`Partial match. Parsing stopped at:\n${parserPosition(data, result.position)}`);
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}
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return result.value;
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}
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function tryParse(parser, str, options) {
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return tryParse$1(parser, [...str], options);
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}
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function match(matcher, str, options) {
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return match$1(matcher, [...str], options);
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}
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export { oneOf as anyOf, char, charTest, concat, match, noneOf, oneOf, parse, parserPosition, str, tryParse };
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