parse-statements
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Fast and easy parser of statements in source code in any language ✂️
192 lines (191 loc) • 10.5 kB
JavaScript
import { getPreparedOptions } from './getPreparedOptions.js';
/**
* Creates parse function by comments and statements.
*/
export const createParseFunction = (options) => {
var { commentsKeys, nextStatementRegExp, onError: onGlobalError, preparedComments, preparedStatements, statementsKeys, } = getPreparedOptions(options);
const parse = (context, source) => {
var _a, _b, _c, _d, _e, _f;
var index = 0;
var parsedComments;
var previousIndex;
findNextStatement: while (index < source.length) {
if (index === previousIndex) {
index += 1;
continue findNextStatement;
}
previousIndex = index;
nextStatementRegExp.lastIndex = index;
const nextStatementMatch = nextStatementRegExp.exec(source);
if (nextStatementMatch === null) {
return;
}
for (const key of statementsKeys) {
const token = (_a = nextStatementMatch.groups) === null || _a === void 0 ? void 0 : _a[key];
if (token === undefined) {
continue;
}
const parsedTokens = [];
const { onError, onParse, tokens } = preparedStatements[key];
index = nextStatementRegExp.lastIndex;
let lastParsedToken = {
start: nextStatementMatch.index,
end: index,
match: nextStatementMatch,
token,
};
parsedTokens.push(lastParsedToken);
for (const { nextTokenRegExp, nextTokenKey } of tokens) {
let previousTokensIndex;
let tokensIndex = index;
findNextToken: while (tokensIndex < source.length) {
if (tokensIndex === previousTokensIndex) {
tokensIndex += 1;
continue findNextToken;
}
previousTokensIndex = tokensIndex;
nextTokenRegExp.lastIndex = tokensIndex;
const nextTokenMatch = nextTokenRegExp.exec(source);
if (nextTokenMatch === null) {
if (parsedComments === undefined) {
parsedComments = {};
for (const commentPair of lastParsedToken.comments || emptyComments) {
parsedComments[commentPair[0].start] = commentPair;
}
}
delete lastParsedToken.comments;
const maybeIndex = onError === null || onError === void 0 ? void 0 : onError(context, source, ...parsedTokens);
if (maybeIndex !== undefined) {
index = maybeIndex;
}
continue findNextStatement;
}
const nextToken = (_b = nextTokenMatch.groups) === null || _b === void 0 ? void 0 : _b[nextTokenKey];
if (nextToken !== undefined) {
index = nextTokenRegExp.lastIndex;
lastParsedToken = {
start: nextTokenMatch.index,
end: index,
match: nextTokenMatch,
token: nextToken,
};
parsedTokens.push(lastParsedToken);
break findNextToken;
}
for (const commentKey of commentsKeys) {
const commentToken = (_c = nextTokenMatch.groups) === null || _c === void 0 ? void 0 : _c[commentKey];
if (commentToken === undefined) {
continue;
}
if (parsedComments !== undefined) {
const commentPair = parsedComments[nextTokenMatch.index];
if (commentPair === undefined) {
onGlobalError === null || onGlobalError === void 0 ? void 0 : onGlobalError(context, source, `Cannot find already parsed comment in statement ${token} with token ${commentToken}`, nextTokenMatch.index);
}
else {
tokensIndex = commentPair[1].end;
(_d = lastParsedToken.comments) !== null && _d !== void 0 ? _d : (lastParsedToken.comments = []);
lastParsedToken.comments.push(commentPair);
continue findNextToken;
}
}
const { closeRegExp, onError: onCommentError, onParse: onCommentParse, } = preparedComments[commentKey];
tokensIndex = nextTokenRegExp.lastIndex;
const openToken = {
start: nextTokenMatch.index,
end: tokensIndex,
match: nextTokenMatch,
token: commentToken,
};
closeRegExp.lastIndex = tokensIndex;
const closeMatch = closeRegExp.exec(source);
if (closeMatch === null) {
onCommentError === null || onCommentError === void 0 ? void 0 : onCommentError(context, source, openToken);
onError === null || onError === void 0 ? void 0 : onError(context, source, ...parsedTokens);
return;
}
tokensIndex = closeRegExp.lastIndex;
const closeToken = {
start: closeMatch.index,
end: tokensIndex,
match: closeMatch,
token: closeMatch[0],
};
(_e = lastParsedToken.comments) !== null && _e !== void 0 ? _e : (lastParsedToken.comments = []);
lastParsedToken.comments.push([openToken, closeToken]);
onCommentParse === null || onCommentParse === void 0 ? void 0 : onCommentParse(context, source, openToken, closeToken);
continue findNextToken;
}
onGlobalError === null || onGlobalError === void 0 ? void 0 : onGlobalError(context, source, `Cannot find next part of statement ${token} or comments by regexp ${nextTokenRegExp}`, tokensIndex);
tokensIndex = nextTokenRegExp.lastIndex;
}
if (tokensIndex >= source.length) {
if (parsedComments === undefined) {
parsedComments = {};
for (const commentPair of lastParsedToken.comments || emptyComments) {
parsedComments[commentPair[0].start] = commentPair;
}
}
delete lastParsedToken.comments;
const maybeIndex = onError === null || onError === void 0 ? void 0 : onError(context, source, ...parsedTokens);
if (maybeIndex !== undefined) {
index = maybeIndex;
}
continue findNextStatement;
}
}
const maybeIndex = onParse === null || onParse === void 0 ? void 0 : onParse(context, source, ...parsedTokens);
if (maybeIndex !== undefined) {
index = maybeIndex;
}
continue findNextStatement;
}
for (const key of commentsKeys) {
const token = (_f = nextStatementMatch.groups) === null || _f === void 0 ? void 0 : _f[key];
if (token === undefined) {
continue;
}
if (parsedComments !== undefined) {
const commentPair = parsedComments[nextStatementMatch.index];
if (commentPair === undefined) {
onGlobalError === null || onGlobalError === void 0 ? void 0 : onGlobalError(context, source, `Cannot find already parsed comment with token ${token}`, nextStatementMatch.index);
}
else {
index = commentPair[1].end;
continue findNextStatement;
}
}
const { closeRegExp, onError, onParse } = preparedComments[key];
index = nextStatementRegExp.lastIndex;
const openToken = {
start: nextStatementMatch.index,
end: index,
match: nextStatementMatch,
token,
};
closeRegExp.lastIndex = index;
const closeMatch = closeRegExp.exec(source);
if (closeMatch === null) {
onError === null || onError === void 0 ? void 0 : onError(context, source, openToken);
return;
}
index = closeRegExp.lastIndex;
const closeToken = {
start: closeMatch.index,
end: index,
match: closeMatch,
token: closeMatch[0],
};
onParse === null || onParse === void 0 ? void 0 : onParse(context, source, openToken, closeToken);
continue findNextStatement;
}
onGlobalError === null || onGlobalError === void 0 ? void 0 : onGlobalError(context, source, `Cannot find statements or comments by regexp ${nextStatementRegExp}`, index);
index = nextStatementRegExp.lastIndex;
}
};
return parse;
};
/**
* Empty comments array to skip `for-or` cycle.
*/
const emptyComments = [];