TypeScript parser.Streams类代码示例

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

function day() {
    return C.stringIn(['MONDAY', 'TUESDAY', 'WEDNESDAY', 'THURSDAY', 'FRIDAY', 'SATURDAY', 'SUNDAY']);
}

function a(){
    return C.char('a');
}

const string = '-MONDAY-';



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

let stream = Streams.ofString(string);
let parsing = combinator().parse(stream);

assertTrue(parsing.isAccepted());
assertTrue(parsing.isConsumed());

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, assertArrayEquals, assertTrue} from '../../assert';



const helloParser = C.string("Hello")
                    .then(C.char(' ').rep())
                    .then(C.char("'")).drop()
                    .then(C.letter().rep()) // keeping repeated ascii letters
                    .then(C.char("'").drop());    // keeping previous letters

const parsing = helloParser.parse(Streams.ofString("Hello 'World'"));
// C.letter.rep() will giv a array of letters

let x = parsing.value.array();

assertArrayEquals(['W','o','r','l','d'], parsing.value.array(), "Hello World joined");


// Note that helloParser will not reach the end of the stream; it will stop at the space after People
const peopleParsing = helloParser.parse(Streams.ofString("Hello 'People' in 2017"));

assertEquals("People", peopleParsing.value.join(''), "Hello People joined");
assertTrue(peopleParsing.offset < "Hello People in 2017".length, "Bad Offset for Hello People");

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


let response = C.char('a').rep().parse(Streams.ofString('aaaa'));
assertEquals(response.value.join(''), 'aaaa' );
assertEquals(response.offset, 4 )
assertTrue(response.isAccepted());
assertTrue(response.isConsumed());

// Partially accepted
response = C.char('a').rep().parse(Streams.ofString('aabb'));
assertEquals(response.value.join(''), 'aa' );
assertEquals(response.offset, 2 )
assertTrue(response.isAccepted());
assertFalse(response.isConsumed());

import {C, F, Streams} from '@masala/parser'


import{assertArrayEquals, assertEquals, assertTrue} from './assert';

let stream = Streams.ofString('ab');
let parser = C.char('a');
let arrayParser = parser.then(C.char('b'));
let parsing = arrayParser.parse(stream);

assertArrayEquals(['a', 'b'], parsing.value) ; //compiling, types are almost OK


parser = C.char('a');

let charParsing = parser.parse(Streams.ofString('a'));
let charParsingValue = charParsing.value;
assertTrue(charParsingValue === 'a');


let singleParsing = parser.parse(stream);
assertTrue( 'a' === singleParsing.value); //compiling, types are almost OK


parser = C.char('a');
singleParsing = parser.parse(stream);
assertEquals( 'a' , singleParsing.value); //compiling, types are almost OK

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');

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





let stream= Streams.ofString('|4.6|');
const floorCombinator = C.char('|').drop()
    .then(N.numberLiteral())    // we have ['|',4.6], we keep 4.6
    .then(C.char('|').drop())   // we have [4.6, '|'], we keep 4.6
    .map(x =>Math.floor(x));

// Parsec needs a stream of characters
let parsing = floorCombinator.parse(stream);
assertEquals( 4, parsing.value, 'Floor parsing');

import {Streams, F, C, Option, N, SingleParser, parserBuilder, ListParser} from '@masala/parser'
import {assertTrue} from '../../assert';


/**
 * A gives its VALUE to B using flatMap
 */
function A(char){
    return C.char(char.toUpperCase()).rep().flatMap(B);
}


/**
 * 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']));
}



const parser = A('a');

const str = 'AAAB';
const stream = Streams.ofString(str);
const parsing = parser.parse(stream);

assertTrue(parsing.offset === str.length);