decaffeinate-parser/dist/util/isHeregexTemplateNode.mjs

A better AST for CoffeeScript, inspired by CoffeeScriptRedux.

import { SourceType } from 'coffee-lex';
import { Call, Literal, Value } from 'decaffeinate-coffeescript2/lib/coffeescript/nodes';
/**
 * Determine if the given CoffeeScript AST node is an interpolated heregex node
 * that's pretending to be a function call to the RegExp function.
 */
export default function isHeregexTemplateNode(node, context) {
    if (!(node instanceof Call) ||
        !node.variable ||
        !(node.variable instanceof Value) ||
        !node.variable.base ||
        !(node.variable.base instanceof Literal) ||
        node.variable.base.value !== 'RegExp') {
        return false;
    }
    var sourceTokens = context.sourceTokens, linesAndColumns = context.linesAndColumns;
    var start = linesAndColumns.indexForLocation({
        line: node.locationData.first_line,
        column: node.locationData.first_column
    });
    if (start === null) {
        return false;
    }
    var startTokenIndex = sourceTokens.indexOfTokenContainingSourceIndex(start);
    if (startTokenIndex === null) {
        return false;
    }
    var startToken = sourceTokens.tokenAtIndex(startTokenIndex);
    if (startToken === null) {
        return false;
    }
    return startToken.type === SourceType.HEREGEXP_START;
}