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Aliases can also be derived

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This commit is contained in:
RMidhunSuresh 2022-07-19 14:55:42 +05:30
parent 081de5afa8
commit 07db5450b7
1 changed files with 61 additions and 14 deletions
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65
src/platform/web/DerivedVariables.ts
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@ -19,6 +19,8 @@ export class DerivedVariables {
private _baseVariables: Record<string, string>;
private _variablesToDerive: string[]
private _isDark: boolean
private _aliases: Record<string, string> = {};
private _derivedAliases: string[] = [];
constructor(baseVariables: Record<string, string>, variablesToDerive: string[], isDark: boolean) {
this._baseVariables = baseVariables;
@ -27,28 +29,73 @@ export class DerivedVariables {
}
toVariables(): Record<string, string> {
const aliases: any = {};
const resolvedVariables: any = {};
const RE_VARIABLE_VALUE = /(.+)--(.+)-(.+)/;
this._detectAliases();
for (const variable of this._variablesToDerive) {
const resolvedValue = this._derive(variable);
if (resolvedValue) {
resolvedVariables[variable] = resolvedValue;
}
}
for (const [alias, variable] of Object.entries(this._aliases) as any) {
resolvedVariables[alias] = this._baseVariables[variable] ?? resolvedVariables[variable];
}
for (const variable of this._derivedAliases) {
const resolvedValue = this._deriveAlias(variable, resolvedVariables);
if (resolvedValue) {
resolvedVariables[variable] = resolvedValue;
}
}
return resolvedVariables;
}
private _detectAliases() {
const newVariablesToDerive: string[] = [];
for (const variable of this._variablesToDerive) {
// If this is an alias, store it for processing later
const [alias, value] = variable.split("=");
if (value) {
aliases[alias] = value;
continue;
this._aliases[alias] = value;
}
// Resolve derived variables
else {
newVariablesToDerive.push(variable);
}
}
this._variablesToDerive = newVariablesToDerive;
}
private _derive(variable: string): string | undefined {
const RE_VARIABLE_VALUE = /(.+)--(.+)-(.+)/;
const matches = variable.match(RE_VARIABLE_VALUE);
if (matches) {
const [, baseVariable, operation, argument] = matches;
const value = this._baseVariables[baseVariable];
if (!value ) {
if (this._aliases[baseVariable]) {
this._derivedAliases.push(variable);
return;
}
else {
throw new Error(`Cannot find value for base variable "${baseVariable}"!`);
}
}
const resolvedValue = derive(value, operation, argument, this._isDark);
resolvedVariables[variable] = resolvedValue;
return resolvedValue;
}
}
for (const [alias, variable] of Object.entries(aliases) as any) {
resolvedVariables[alias] = this._baseVariables[variable] ?? resolvedVariables[variable];
private _deriveAlias(variable: string, resolvedVariables: Record<string, string>): string | undefined {
const RE_VARIABLE_VALUE = /(.+)--(.+)-(.+)/;
const matches = variable.match(RE_VARIABLE_VALUE);
if (matches) {
const [, baseVariable, operation, argument] = matches;
const value = resolvedVariables[baseVariable];
if (!value ) {
throw new Error(`Cannot find value for alias "${baseVariable}" when trying to derive ${variable}!`);
}
const resolvedValue = derive(value, operation, argument, this._isDark);
return resolvedValue;
}
return resolvedVariables;
}
}