commit 32f96b2dd01a41e6b5912afa6ac41923b5d5a857 · kitten.sh/reghex

+61 -92
src/codegen.js
···

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         return body.trim();

     

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       }

     

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       const makeOpts = (prev, next) => {

     

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         const output = {};

     

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         for (const key in prev) output[key] = prev[key];

     

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         for (const key in next) output[key] = next[key];

     

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         return output;

     

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       const copy = (prev) => {

     

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         const next = {};

     

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         for (const key in prev) next[key] = prev[key];

     

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         return next;

     

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       };

     

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       const assignIndex = (depth) =>

     
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       const astGroup = (ast, depth, opts) => {

     

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         const capture = !!opts.capture && !ast.capture;

     

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         opts = copy(opts);

     

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         opts.capture = capture;

     

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         let group = '';

     

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         if (!opts.length && capture) {

     

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           opts.length = depth;

     

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           return js`

     

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             ${js`var length_${depth} = ${_node}.length;`}

     

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             ${astSequence(

     

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               ast.sequence,

     

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               depth + 1,

     

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               makeOpts(opts, {

     

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                 length: depth,

     

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                 capture,

     

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               })

     

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             )}

     

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             ${astSequence(ast.sequence, depth + 1, opts)}

     

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           `;

     

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         }

     

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         return astSequence(

     

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           ast.sequence,

     

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           depth + 1,

     

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           makeOpts(opts, {

     

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             capture,

     

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           })

     

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         );

     

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         return astSequence(ast.sequence, depth + 1, opts);

     

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       };

     

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       const astChild = (ast, depth, opts) =>

     

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         ast.expression ? astExpression(ast, depth, opts) : astGroup(ast, depth, opts);

     

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       const astRepeating = (ast, depth, opts) => {

     

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         const label = `loop_${depth}`;

     

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       const astQuantifier = (ast, depth, opts) => {

     

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         const { index, abort, onAbort } = opts;

     

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         const invert = `invert_${depth}`;

     

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         const loop = `loop_${depth}`;

     

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         const count = `count_${depth}`;

     

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         return js`

     

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           ${label}: for (var ${count} = 0; true; ${count}++) {

     

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             ${assignIndex(depth)}

     

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             ${astChild(

     

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               ast,

     

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               depth,

     

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               makeOpts(opts, {

     

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                 onAbort: js`

     

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                 if (${count}) {

     

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                   ${restoreIndex(depth)}

     

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                   break ${label};

     

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                 } else {

     

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                   ${opts.onAbort || ''}

     

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                 }

     

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               `,

     

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               })

     

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             )}

     

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           }

     

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         `;

     

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       };

     

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       const astMultiple = (ast, depth, opts) => {

     

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         const label = `loop_${depth}`;

     

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         return js`

     

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           ${label}: while (true) {

     

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             ${assignIndex(depth)}

     

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             ${astChild(

     

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               ast,

     

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               depth,

     

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               makeOpts(opts, {

     

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                 length: 0,

     

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                 index: depth,

     

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                 abort: js`break ${label};`,

     

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                 onAbort: '',

     

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               })

     

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             )}

     

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           }

     

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         `;

     

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       };

     

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       const astOptional = (ast, depth, opts) => js`

     

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         ${assignIndex(depth)}

     

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         ${astChild(

     

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           ast,

     

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           depth,

     

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           makeOpts(opts, {

     

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             index: depth,

     

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             abort: '',

     

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             onAbort: '',

     

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           })

     

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         )}

     

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       `;

     

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       const astQuantifier = (ast, depth, opts) => {

     

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         const { index, abort } = opts;

     

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         const label = `invert_${depth}`;

     

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         opts = copy(opts);

     

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         if (ast.capture === '!') {

     

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           opts = makeOpts(opts, {

     

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             index: depth,

     

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             abort: js`break ${label};`,

     

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           });

     

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           opts.index = depth;

     

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           opts.abort = js`break ${invert}`;

     

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         }

     

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         let child;

     

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         if (ast.quantifier === '+') {

     

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           child = astRepeating(ast, depth, opts);

     

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         } else if (ast.quantifier === '*') child = astMultiple(ast, depth, opts);

     

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         else if (ast.quantifier === '?') child = astOptional(ast, depth, opts);

     

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         else child = astChild(ast, depth, opts);

     

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           opts.onAbort = js`

     

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             if (${count}) {

     

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               ${restoreIndex(depth)}

     

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               break ${loop};

     

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             } else {

     

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               ${onAbort}

     

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             }

     

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           `;

     

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           child = js`

     

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             ${loop}: for (var ${count} = 0; true; ${count}++) {

     

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               ${assignIndex(depth)}

     

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               ${astChild(ast, depth, opts)}

     

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             }

     

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           `;

     

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         } else if (ast.quantifier === '*') {

     

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           opts.length = 0;

     

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           opts.index = depth;

     

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           opts.abort = js`break ${loop};`;

     

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           opts.onAbort = '';

     

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           child = js`

     

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             ${loop}: while (true) {

     

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               ${assignIndex(depth)}

     

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               ${astChild(ast, depth, opts)}

     

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             }

     

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           `;

     

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         } else if (ast.quantifier === '?') {

     

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           opts.index = depth;

     

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           opts.abort = '';

     

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           opts.onAbort = '';

     

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           child = js`

     

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             ${assignIndex(depth)}

     

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             ${astChild(ast, depth, opts)}

     

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           `;

     

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         } else {

     

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           child = astChild(ast, depth, opts);

     

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         }

     

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         if (ast.capture === '!') {

     

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           return js`

     

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             ${label}: {

     

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             ${invert}: {

     

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               ${assignIndex(depth)}

     

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               ${child}

     

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               ${restoreIndex(index)}

     
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           let childOpts = opts;

     

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           if (ast.alternation) {

     

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             childOpts = makeOpts(opts, {

     

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               index: depth,

     

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               abort: js`break ${block};`,

     

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               onAbort: '',

     

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             });

     

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             childOpts = copy(opts);

     

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             childOpts.index = depth;

     

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             childOpts.abort = js`break ${block};`;

     

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             childOpts.onAbort = '';

     

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           }

     

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           let sequence = '';