smarthbs/ts/smarthbs.variables.ts

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// This file contains code that makes it easy to search handlebar templates for variables.
// Why? To get a clue if you are missing some.
import * as plugins from './smarthbs.plugins';
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// the curly regex objects
let tripleCurlyRegex = /{{{\s*[\w\.]+\s*}}}/g;
let doubleCurlyRegex = /{{\s*[\w\.]+\s*}}/g;
let nameInCurlsRegex = /[\w\.]+/;
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/**
* finds all variables in a handlebars template
* @param hbsStringArg
*/
export let findVarsInHbsString = async (hbsStringArg: string) => {
let hbsString = hbsStringArg; // make sure we have a new string object that we may destroy
let varNameArray: string[] = [];
let tripleCurlyMatches = hbsString.match(tripleCurlyRegex);
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if (tripleCurlyMatches) {
hbsString = hbsString.replace(tripleCurlyRegex, '[[[replaced]]]');
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varNameArray = varNameArray.concat(tripleCurlyMatches);
}
let doubleCurlyMatches = hbsString.match(doubleCurlyRegex);
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if (doubleCurlyMatches) {
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varNameArray = varNameArray.concat(doubleCurlyMatches);
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}
// make sure we are clean from curly brackets
varNameArray = varNameArray.map(x => {
return x.match(nameInCurlsRegex)[0];
});
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// make sure are uniq
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varNameArray = plugins.lodashUniq(varNameArray);
return varNameArray;
};
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/**
* checks if supplied variables satisfy an handlebars template
* @param hbsStringArg
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* @param varObjectArg
* @return string array with missing variable names
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*/
export let checkVarsSatisfaction = async (hbsStringArg: string, varObjectArg: any) => {
// required vars as combined deep string with . notation
let requiredVarStrings = await findVarsInHbsString(hbsStringArg);
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// comparison objects
let suppliedVarsObject = varObjectArg;
let missingVarsObject: string[] = [];
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// building the
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for (let stringVar of requiredVarStrings) {
let splittedVars = stringVar.split('.');
let requiredPointer = suppliedVarsObject;
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for (let i = 0; i < splittedVars.length; i++) {
let splitVar = splittedVars[i];
let varAvailable = requiredPointer[splitVar] !== undefined;
if (varAvailable && splittedVars.length === i + 1) {
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// ok
} else if (varAvailable) {
requiredPointer = requiredPointer[splitVar];
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} else {
missingVarsObject.push(stringVar);
i = splittedVars.length;
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}
}
}
return missingVarsObject;
};