fxyn/dist/pattern-utils.js

Minimalist parser combinator

import { matchString } from "./combinators/match.js";
import { Tree } from "./tree.js";
export const toPattern = (from)=>typeof from === 'string' ? matchString(from) : from;
export const p = (name, pattern, hidden = false)=>{
    const resolvedPattern = toPattern(pattern);
    const namedPattern = (source)=>{
        const match = resolvedPattern(source);
        if (match === null) return null;
        match.tree.name = name;
        match.tree.hidden = hidden;
        return match;
    };
    namedPattern.p = name;
    return namedPattern;
};
// allow combinator to support `PatternLike` types, like raw string.
export const wrapPatternLike = (combinator)=>(...patternLikes)=>combinator(...patternLikes.map(toPattern));
// NOTE: this is a quick helper. it does not check slice validity and assumes that the caller already proved it.
export const newLeafSuccessResult = (source, consumed)=>({
        tree: Tree.newLeaf(source.take(consumed)),
        consumed,
        rest: source.skip(consumed)
    });
export const wrapSuccessResult = (matchResult)=>matchResult !== null ? {
        ...matchResult,
        tree: Tree.newTree(matchResult.tree.spanned, [
            matchResult.tree
        ])
    } : null;

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