TypeScript parser.F类代码示例

function combinator() {
    return C.letters()
        .then(C.char(' '))
        .then(C.lowerCase().rep())
        .then(C.char(' '))
        .then(C.notString('romane').rep())
        .then(F.eos());
}

function combinator() {
    return F.any().then(day()).then(F.nop()).then(F.any()).thenEos();
}

function combinator() {
    return F.not(day()).then(F.not(a())).then(F.not(day()));
}

function combinator() {
    return F.startWith('hello: ')
        .then(F.moveUntil('brown'))
        .then(C.string('brown'))
        .then(F.dropTo('dog'))
}

function emptyTry() {
    return F.try(C.string('xyz'));
}

import {Streams, F, C, N} from '@masala/parser'
import {assertEquals, assertArrayEquals, assertTrue} from '../../assert';

// Parsec needs a stream of characters
const document = '12';
const s = Streams.ofString(document);

// numberLitteral defines any int or float number
// We expect a number, then eos: End Of Stream
// We use drop() because we don't need the value of F.eos, we only want 12
const numberParser = N.numberLiteral().then(F.eos().drop());
const parsing = numberParser.parse(s);

// If the parser reached the end of stream (F.eos) without rejection, parsing is accepted
assertTrue(parsing.isAccepted());
// The parser has a 12 value inside the monoid
assertEquals (12, parsing.value);

import {Streams, F, C, N} from '@masala/parser'
import {assertEquals} from '../../assert';


/**
 * Created by Nicolas Zozol on 05/11/2017.
 */
const stream = Streams.ofString('abc');
const charsParser = C.char('a')
    .then(C.char('b'))
    .then(C.char('c'))
    .then(F.eos().drop()); // End Of Stream ; droping its value, just checking it's here
let charsParsing = charsParser.parse(stream);
assertEquals('abc', charsParsing.value.join(''), 'Chars parsing');

function multExpr() {
    return andOperation().drop().then(terminal())
        .then(F.lazy(optionalMultExpr))
        .map(([left,right]) => left * right.orElse(1));
}

/**
 * There is recursion, and we call A with lazy. We send PARAMETERS to A
 * within an array
 */
function B(aVal) {
    return C.char('B').map(bVal=> aVal.join('')+'-'+bVal).or(F.lazy(A, ['a']));
}

function plusExpr() {
    return plusOperation().drop().then(subExpr())
        .then(F.lazy(optionalPlusExpr))
        .map(([left,right])=>left+right.orElse(0));
}