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// The parser is from Mozilla's iodide project:

// https://github.com/iodide-project/iodide/blob/master/src/editor/iomd-tools/iomd-parser.js

function hashCode(str) {

// this is an implementation of java's hashcode method

// https://stackoverflow.com/questions/7616461/generate-a-hash-from-string-in-javascript

let hash = 0;

let chr;

if (str.length !== 0) {

for (let i = 0; i < str.length; i++) {

chr = str.charCodeAt(i);

hash = (hash << 5) - hash + chr; // eslint-disable-line

hash |= 0; // eslint-disable-line

}

return hash.toString();

}

export function iomdParser(fullIomd) {

const iomdLines = fullIomd.split('\n');

const chunks = [];

let currentChunkLines = [];

let currentEvalType = '';

let evalFlags = [];

let currentChunkStartLine = 1;

const newChunkId = (str) => {

const hash = hashCode(str);

let hashNum = '0';

for (const chunk of chunks) {

const [prevHash, prevHashNum] = chunk.chunkId.split('_');

if (hash === prevHash) {

hashNum = (parseInt(prevHashNum, 10) + 1).toString();

}

return `${hash}_${hashNum}`;

};

const pushChunk = (endLine) => {

const chunkContent = currentChunkLines.join('\n');

chunks.push({

chunkContent,

chunkType: currentEvalType,

chunkId: newChunkId(chunkContent),

evalFlags,

startLine: currentChunkStartLine,

endLine,

});

};

for (const [i, line] of iomdLines.entries()) {

const lineNum = i + 1; // uses 1-based indexing

if (line.slice(0, 2) === '%%') {

// if line start with '%%', a new chunk has started

// push the current chunk (unless it's on line 1), then reset

if (lineNum !== 1) {

// DON'T push a chunk if we're only on line 1

pushChunk(lineNum - 1);

}

// reset the currentChunk state

currentChunkStartLine = lineNum;

currentChunkLines = [];

evalFlags = [];

// find the first char on this line that isn't '%'

let lineColNum = 0;

while (line[lineColNum] === '%') {

lineColNum += 1;

}

const chunkFlags = line

.slice(lineColNum)

.split(/[ \t]+/)

.filter((s) => s !== '');

if (chunkFlags.length > 0) {

// if there is a captured group, update the eval type

[currentEvalType, ...evalFlags] = chunkFlags;

}

} else {

// if there is no match, then the line is not a

// chunk delimiter line, so add the line to the currentChunk

currentChunkLines.push(line);

}

// this is what's left over in the final chunk

pushChunk(iomdLines.length);

return chunks;

}

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