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Extracted language provider variables for readibility

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This commit is contained in:
David Kaltschmidt 2018-11-15 11:20:27 +00:00
parent ff0ed06441
commit ce59acd141
1 changed files with 15 additions and 10 deletions
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25
public/app/plugins/datasource/prometheus/language_provider.ts
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@ -79,15 +79,23 @@ export default class PromQlLanguageProvider extends LanguageProvider {
// Keep this DOM-free for testing
provideCompletionItems({ prefix, wrapperClasses, text, value }: TypeaheadInput, context?: any): TypeaheadOutput {
// Syntax spans have 3 classes by default. More indicate a recognized token
const tokenRecognized = wrapperClasses.length > 3;
// Local text properties
const empty = value.document.text.length === 0;
const selectedLines = value.document.getTextsAtRangeAsArray(value.selection);
const currentLine = selectedLines.length === 1 ? selectedLines[0] : null;
const nextCharacter = currentLine ? currentLine.text[value.selection.anchorOffset] : null;
// Syntax spans have 3 classes by default. More indicate a recognized token
const tokenRecognized = wrapperClasses.length > 3;
// Non-empty prefix, but not inside known token
const prefixUnrecognized = prefix && !tokenRecognized;
// Prevent suggestions in `function(|suffix)`
const noSuffix = !nextCharacter || nextCharacter === ')';
// Empty prefix is safe if it does not immediately folllow a complete expression and has no text after it
const safeEmptyPrefix = prefix === '' && !text.match(/^[\]})\s]+$/) && noSuffix;
// About to type next operand if preceded by binary operator
const isNextOperand = text.match(/[+\-*/^%]/);
// Determine candidates by CSS context
if (_.includes(wrapperClasses, 'context-range')) {
// Suggestions for metric[|]
@ -96,16 +104,13 @@ export default class PromQlLanguageProvider extends LanguageProvider {
// Suggestions for metric{|} and metric{foo=|}, as well as metric-independent label queries like {|}
return this.getLabelCompletionItems.apply(this, arguments);
} else if (_.includes(wrapperClasses, 'context-aggregation')) {
// Suggestions for sum(metric) by (|)
return this.getAggregationCompletionItems.apply(this, arguments);
} else if (empty) {
// Suggestions for empty query field
return this.getEmptyCompletionItems(context || {});
} else if (
// Show default suggestions in a couple of scenarios
(prefix && !tokenRecognized) || // Non-empty prefix, but not inside known token
// Empty prefix, but not directly following a closing brace (e.g., `]|`), or not succeeded by anything except a closing parens, e.g., `sum(|)`
(prefix === '' && !text.match(/^[\]})\s]+$/) && (!nextCharacter || nextCharacter === ')')) ||
text.match(/[+\-*/^%]/) // Anything after binary operator
) {
} else if (prefixUnrecognized || safeEmptyPrefix || isNextOperand) {
// Show term suggestions in a couple of scenarios
return this.getTermCompletionItems();
}