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Fix: Ignore @support block if @support or feature is not supported
Fix #1869
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| enum ValidStatements { | ||
| and = 'and', | ||
| empty = '', | ||
| false = 'false', | ||
| negation = 'not', | ||
| or = 'or', | ||
| selector = 'selector', | ||
| true = 'true' | ||
| } | ||
|
|
||
| const validStatementsStrings: string[] = Object.values(ValidStatements); | ||
|
|
||
| // nottrue | ||
| validStatementsStrings.push(`${ValidStatements.negation}${ValidStatements.true}`); | ||
| // notfalse | ||
| validStatementsStrings.push(`${ValidStatements.negation}${ValidStatements.false}`); | ||
| // selectortrue | ||
| validStatementsStrings.push(`${ValidStatements.selector}${ValidStatements.true}`); | ||
| // selectorfalse | ||
| validStatementsStrings.push(`${ValidStatements.selector}${ValidStatements.false}`); | ||
|
|
||
| export const evaluateQuery = (queryString: string): boolean => { | ||
| const query = queryString.toLowerCase(); | ||
|
|
||
| if (query === 'false') { | ||
| return false; | ||
| } else if (query === 'true') { | ||
| return true; | ||
| } | ||
|
|
||
| const regex = /\(([^()]*)\)/; | ||
| /* | ||
| * Get content inside parentheses. | ||
| */ | ||
| let exec = regex.exec(query); | ||
| let finalQuery = query; | ||
|
|
||
| while (exec !== null) { | ||
| const condition = exec[1]; | ||
|
|
||
| finalQuery = finalQuery.replace(exec[0], evaluateQuery(condition).toString()); | ||
|
|
||
| exec = regex.exec(finalQuery); | ||
| } | ||
|
|
||
| /* | ||
| * Split the query in statements. | ||
| */ | ||
| const splitQuery = finalQuery.trim().split(' '); | ||
| let operator: string | null = null; | ||
| let result: boolean | null = null; | ||
|
|
||
| for (const partialQuery of splitQuery) { | ||
| /* | ||
| * We expect only the strings in validStatementsStrings. | ||
| * If we receive something diferente, validate the whole | ||
| * query as true. | ||
| * e.g. var, x, =, console, etc. | ||
| */ | ||
| if (!partialQuery.startsWith(ValidStatements.negation) && !partialQuery.startsWith(ValidStatements.selector) && !validStatementsStrings.includes(partialQuery)) { | ||
| return true; | ||
| } | ||
|
|
||
| /* | ||
| * If partialQuery is an empty string, ignore it. | ||
| */ | ||
| if (!partialQuery) { | ||
| continue; | ||
| } | ||
|
|
||
| /* | ||
| * Store the operator statement for the next item. | ||
| */ | ||
| if (partialQuery === ValidStatements.and || partialQuery === ValidStatements.or) { | ||
| operator = partialQuery; | ||
|
|
||
| continue; | ||
| } | ||
|
|
||
| /* | ||
| * Check if the statement is negated, is a selector, or neither of those. | ||
| */ | ||
| let partialResult: boolean; | ||
|
|
||
| if (partialQuery.startsWith(ValidStatements.negation)) { | ||
| partialResult = !evaluateQuery(partialQuery.substr(ValidStatements.negation.length)); | ||
| } else if (partialQuery.startsWith(ValidStatements.selector)) { | ||
| partialResult = true; | ||
| } else { | ||
| partialResult = evaluateQuery(partialQuery); | ||
| } | ||
|
|
||
| /* | ||
| * This should be true only in the first iteration. | ||
| */ | ||
| if (result === null) { | ||
| result = partialResult; | ||
|
|
||
| continue; | ||
| } | ||
|
|
||
| if (operator) { | ||
| /* | ||
| * Calculate the accumulated result. | ||
| */ | ||
| result = operator === ValidStatements.and ? result && partialResult : result || partialResult; | ||
|
|
||
| operator = null; | ||
| } | ||
| } | ||
|
|
||
| return !!result; | ||
| }; |
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