90 lines
2.8 KiB
JavaScript
90 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';
|
||
|
|
import { clamp, escapeWhitespace } from './util.mjs';
|
||
|
|
|
||
|
|
function char(char) {
|
||
|
|
return token((c) => (c === char) ? c : undefined);
|
||
|
|
}
|
||
|
|
function oneOf(chars) {
|
||
|
|
return token((c) => (chars.includes(c)) ? c : undefined);
|
||
|
|
}
|
||
|
|
function noneOf(chars) {
|
||
|
|
return token((c) => (chars.includes(c)) ? undefined : c);
|
||
|
|
}
|
||
|
|
function charTest(regex) {
|
||
|
|
return token((c) => regex.test(c) ? c : undefined);
|
||
|
|
}
|
||
|
|
function str(str) {
|
||
|
|
const len = str.length;
|
||
|
|
return (data, i) => {
|
||
|
|
const tokensNumber = remainingTokensNumber(data, i);
|
||
|
|
let substr = '';
|
||
|
|
let j = 0;
|
||
|
|
while (j < tokensNumber && substr.length < len) {
|
||
|
|
substr += data.tokens[i + j];
|
||
|
|
j++;
|
||
|
|
}
|
||
|
|
return (substr === str)
|
||
|
|
? {
|
||
|
|
matched: true,
|
||
|
|
position: i + j,
|
||
|
|
value: str
|
||
|
|
}
|
||
|
|
: { matched: false };
|
||
|
|
};
|
||
|
|
}
|
||
|
|
function concat(...ps) {
|
||
|
|
return map(flatten(...ps), (vs) => vs.join(''));
|
||
|
|
}
|
||
|
|
function parserPosition(data, i, contextTokens = 11) {
|
||
|
|
const len = data.tokens.length;
|
||
|
|
const lowIndex = clamp(0, i - contextTokens, len - contextTokens);
|
||
|
|
const highIndex = clamp(contextTokens, i + 1 + contextTokens, len);
|
||
|
|
const tokensSlice = data.tokens.slice(lowIndex, highIndex);
|
||
|
|
if (tokensSlice.some((t) => t.length !== 1)) {
|
||
|
|
return parserPosition$1(data, i, (t) => t);
|
||
|
|
}
|
||
|
|
let line = '';
|
||
|
|
let offset = 0;
|
||
|
|
let markerLen = 1;
|
||
|
|
if (i < 0) {
|
||
|
|
line += ' ';
|
||
|
|
}
|
||
|
|
if (0 < lowIndex) {
|
||
|
|
line += '...';
|
||
|
|
}
|
||
|
|
for (let j = 0; j < tokensSlice.length; j++) {
|
||
|
|
const token = escapeWhitespace(tokensSlice[j]);
|
||
|
|
if (lowIndex + j === i) {
|
||
|
|
offset = line.length;
|
||
|
|
markerLen = token.length;
|
||
|
|
}
|
||
|
|
line += token;
|
||
|
|
}
|
||
|
|
if (highIndex < len) {
|
||
|
|
line += '...';
|
||
|
|
}
|
||
|
|
if (len <= i) {
|
||
|
|
offset = line.length;
|
||
|
|
}
|
||
|
|
return `${''.padEnd(offset)}${i}\n${line}\n${''.padEnd(offset)}${'^'.repeat(markerLen)}`;
|
||
|
|
}
|
||
|
|
function parse(parser, str, options) {
|
||
|
|
const data = { tokens: [...str], options: options };
|
||
|
|
const result = parser(data, 0);
|
||
|
|
if (!result.matched) {
|
||
|
|
throw new Error('No match');
|
||
|
|
}
|
||
|
|
if (result.position < data.tokens.length) {
|
||
|
|
throw new Error(`Partial match. Parsing stopped at:\n${parserPosition(data, result.position)}`);
|
||
|
|
}
|
||
|
|
return result.value;
|
||
|
|
}
|
||
|
|
function tryParse(parser, str, options) {
|
||
|
|
return tryParse$1(parser, [...str], options);
|
||
|
|
}
|
||
|
|
function match(matcher, str, options) {
|
||
|
|
return match$1(matcher, [...str], options);
|
||
|
|
}
|
||
|
|
|
||
|
|
export { oneOf as anyOf, char, charTest, concat, match, noneOf, oneOf, parse, parserPosition, str, tryParse };
|