Dynamic Token Interpolation

To deliver personalized interactions, Asterisk 2 implements real-time prompt interpolation logic. The engine parses variable template strings prior to converting textual content into spoken output files.

String Replacement Processing Architecture

The flow block below illustrates how raw string blueprints convert into compiled voice scripts:

graph TD
    %% Base Template
    subgraph TemplateSource["Configured Prompt String"]
        RawString["Unparsed Layout String<br/>('Hello ${first_name}, your balance is ${amt}')"]
    end

    %% Token Resolution
    subgraph InterpolatorEngine["Regex Token Engine"]
        MatchTokens["Extract Target Keys<br/>(Identifies: first_name, amt)"]
        FetchCache["Query Current Call Memory<br/>(Fetches: 'Sandeep', '500')"]
    end

    %% Final Payload
    subgraph ExecutedPayload["Output Audio Generator"]
        CompiledAudio["Text-to-Speech Engine<br/>('Hello Sandeep, your balance is 500')"]
    end

    %% Links
    RawString ==>|"Pass Raw Template"| MatchTokens
    MatchTokens --> FetchCache
    FetchCache ==>|"Inject Interpolated String"| CompiledAudio

    %% High-Fidelity Custom Themes
    classDef srcToken fill:#0f172a,stroke:#38bdf8,stroke-width:2px,color:#fff,rx:6px,ry:6px;
    classDef engToken fill:#1e293b,stroke:#a855f7,stroke-width:2px,color:#fff,rx:6px,ry:6px;
    classDef targetToken fill:#065f46,stroke:#10b981,stroke-width:2px,color:#fff,rx:6px,ry:6px;

    class TemplateSource,RawString srcToken;
    class InterpolatorEngine,MatchTokens,FetchCache engToken;
    class ExecutedPayload,CompiledAudio targetToken;

Interpolation Process Rules

1. Missing Token Clamping

If custom text blocks reference parameter names completely absent from operational call memory stores, formatting engines fallback to empty string assignments instantly (""), completely preventing text synthesis engines from reading out raw bracket syntax characters.

2. Nested Token Expansions

String processing pipelines run recursive replacement sweeps up to three nested configuration depth levels, supporting structured variable building operations cleanly.

# Dynamic Token Interpolation

To deliver personalized interactions, **Asterisk 2** implements real-time prompt interpolation logic. The engine parses variable template strings prior to converting textual content into spoken output files.

---

## String Replacement Processing Architecture

The flow block below illustrates how raw string blueprints convert into compiled voice scripts:

```mermaid
graph TD
    %% Base Template
    subgraph TemplateSource["Configured Prompt String"]
        RawString["Unparsed Layout String<br/>('Hello ${first_name}, your balance is ${amt}')"]
    end

%% Token Resolution
    subgraph InterpolatorEngine["Regex Token Engine"]
        MatchTokens["Extract Target Keys<br/>(Identifies: first_name, amt)"]
        FetchCache["Query Current Call Memory<br/>(Fetches: 'Sandeep', '500')"]
    end

%% Final Payload
    subgraph ExecutedPayload["Output Audio Generator"]
        CompiledAudio["Text-to-Speech Engine<br/>('Hello Sandeep, your balance is 500')"]
    end

%% Links
    RawString ==>|"Pass Raw Template"| MatchTokens
    MatchTokens --> FetchCache
    FetchCache ==>|"Inject Interpolated String"| CompiledAudio

%% High-Fidelity Custom Themes
    classDef srcToken fill:#0f172a,stroke:#38bdf8,stroke-width:2px,color:#fff,rx:6px,ry:6px;
    classDef engToken fill:#1e293b,stroke:#a855f7,stroke-width:2px,color:#fff,rx:6px,ry:6px;
    classDef targetToken fill:#065f46,stroke:#10b981,stroke-width:2px,color:#fff,rx:6px,ry:6px;

class TemplateSource,RawString srcToken;
    class InterpolatorEngine,MatchTokens,FetchCache engToken;
    class ExecutedPayload,CompiledAudio targetToken;
```

---

## Interpolation Process Rules

### 1. Missing Token Clamping
If custom text blocks reference parameter names completely absent from operational call memory stores, formatting engines fallback to empty string assignments instantly (`""`), completely preventing text synthesis engines from reading out raw bracket syntax characters.

### 2. Nested Token Expansions
String processing pipelines run recursive replacement sweeps up to three nested configuration depth levels, supporting structured variable building operations cleanly.