commit 169515a67ea80adb9590f5df8c8dc20ee81f670f · kitten.sh/reghex

+17 -26
src/parser.js
···

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       const syntaxError = (char) => {

     

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         throw new SyntaxError('Unexpected token "' + char + '"');

     

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       };

     

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       export const parse = (quasis, expressions) => {

     

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         let quasiIndex = 0;

     

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         let stackIndex = 0;

     
···

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         let lastMatch;

     

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         let currentSequence = rootSequence;

     

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         while (stackIndex < quasis.length + expressions.length) {

     

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         for (

     

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           let quasiIndex = 0, stackIndex = 0;

     

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           stackIndex < quasis.length + expressions.length;

     

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           stackIndex++

     

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         ) {

     

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           if (stackIndex % 2 !== 0) {

     

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             currentSequence.push({

     

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               expression: expressions[stackIndex++ >> 1],

     
···

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           }

     

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           const quasi = quasis[stackIndex >> 1];

     

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           while (quasiIndex < quasi.length) {

     

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           for (quasiIndex = 0; quasiIndex < quasi.length; ) {

     

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             const char = quasi[quasiIndex++];

     

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       -
       

     

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             if (char === ' ' || char === '\t' || char === '\r' || char === '\n') {

     

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               continue;

     

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             } else if (char === '|' && currentSequence.length) {

     

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               currentSequence = currentSequence.alternation = [];

     

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               continue;

     

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             } else if (char === ')' && currentSequence.length) {

     

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               currentGroup = null;

     

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               currentSequence = sequenceStack.pop();

     

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               if (currentSequence) continue;

     

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               if (!currentSequence) syntaxError(char);

     

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             } else if (char === '(') {

     

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               currentGroup = {

     

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                 sequence: [],

     

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               };

     

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               sequenceStack.push(currentSequence);

     

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               currentSequence.push(currentGroup);

     

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               currentSequence.push((currentGroup = { sequence: [] }));

     

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               currentSequence = currentGroup.sequence;

     

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               continue;

     

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             } else if (char === '?' && !currentSequence.length && currentGroup) {

     

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               const nextChar = quasi[quasiIndex++];

     

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               if (nextChar === ':') {

     

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               if (nextChar === ':' || nextChar === '=' || nextChar === '!') {

     

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                 currentGroup.capture = nextChar;

     

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                 continue;

     

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               } else if (nextChar === '=') {

     

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                 currentGroup.capture = nextChar;

     

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                 continue;

     

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               } else if (nextChar === '!') {

     

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                 currentGroup.capture = nextChar;

     

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                 continue;

     

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               } else {

     

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                 syntaxError(char);

     

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               }

     

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             } else if (

     

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               (char === '?' || char === '+' || char === '*') &&

     

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               (lastMatch = currentSequence[currentSequence.length - 1])

     

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             ) {

     

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               lastMatch.quantifier = char;

     

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               continue;

     

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             } else {

     

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               syntaxError(char);

     

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             }

     

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       -
       

     

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             throw new SyntaxError('Unexpected token "' + char + '"');

     

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           }

     

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           stackIndex++;

     

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           quasiIndex = 0;

     

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         }

     

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         return rootSequence;