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<h1><a href="../../index.html">All files</a> / <a href="index.html">src/prompts</a> template_renderer.ts</h1>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* TemplateRenderer
* Simple Mustache-style template rendering without external dependencies
*/
export class TemplateRenderer {
/**
* Render a template with variables
* Supports {{variable}} syntax and {{#if condition}}...{{/if}} conditionals
*/
<span class="fstat-no" title="function not covered" > render(</span>template: string, variables: Record<string, unknown>): string {
let result = <span class="cstat-no" title="statement not covered" >template;</span>
// Handle conditionals first: {{#if variable}}...{{/if}}
<span class="cstat-no" title="statement not covered" > result = this.processConditionals(result, variables);</span>
// Handle variable substitution: {{variable}}
<span class="cstat-no" title="statement not covered" > result = this.substituteVariables(result, variables);</span>
<span class="cstat-no" title="statement not covered" > return result;</span>
}
/**
* Process conditional blocks
*/
private <span class="fstat-no" title="function not covered" >processConditionals(</span>template: string, variables: Record<string, unknown>): string {
const conditionalRegex = <span class="cstat-no" title="statement not covered" >/\{\{#if\s+(\w+)\}\}([\s\S]*?)\{\{\/if\}\}/g;</span>
<span class="cstat-no" title="statement not covered" > return template.replace(conditionalRegex, <span class="fstat-no" title="function not covered" >(m</span>atch, varName, content) => {</span>
const value = <span class="cstat-no" title="statement not covered" >variables[varName];</span>
// Show content if variable is truthy
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (value) {</span>
<span class="cstat-no" title="statement not covered" > return content;</span>
}
<span class="cstat-no" title="statement not covered" > return '';</span>
});
}
/**
* Substitute variables in template
*/
private <span class="fstat-no" title="function not covered" >substituteVariables(</span>template: string, variables: Record<string, unknown>): string {
const variableRegex = <span class="cstat-no" title="statement not covered" >/\{\{(\w+)\}\}/g;</span>
<span class="cstat-no" title="statement not covered" > return template.replace(variableRegex, <span class="fstat-no" title="function not covered" >(m</span>atch, varName) => {</span>
const value = <span class="cstat-no" title="statement not covered" >variables[varName];</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (value === undefined || value === null) {</span>
<span class="cstat-no" title="statement not covered" > return match; </span>// Keep placeholder if variable not found
}
// Convert to string and escape special characters
<span class="cstat-no" title="statement not covered" > return this.escapeValue(String(value));</span>
});
}
/**
* Escape special characters for safe output
*/
private <span class="fstat-no" title="function not covered" >escapeValue(</span>value: string): string {
<span class="cstat-no" title="statement not covered" > return value</span>
.replace(/&/g, '&amp;')
.replace(/</g, '&lt;')
.replace(/>/g, '&gt;')
.replace(/"/g, '&quot;')
.replace(/'/g, '&#39;');
}
/**
* Validate template syntax
*/
<span class="fstat-no" title="function not covered" > validateTemplate(</span>template: string): boolean {
<span class="cstat-no" title="statement not covered" > try {</span>
// Check for balanced conditional blocks
const openIfs = <span class="cstat-no" title="statement not covered" >(template.match(/\{\{#if\s+\w+\}\}/g) || []).length;</span>
const closeIfs = <span class="cstat-no" title="statement not covered" >(template.match(/\{\{\/if\}\}/g) || []).length;</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (openIfs !== closeIfs) {</span>
<span class="cstat-no" title="statement not covered" > return false;</span>
}
// Check for valid variable syntax
const variables = <span class="cstat-no" title="statement not covered" >template.match(/\{\{(\w+)\}\}/g) || [];</span>
<span class="cstat-no" title="statement not covered" > for (const variable of variables) {</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (!/^\{\{\w+\}\}$/.test(variable)) {</span>
<span class="cstat-no" title="statement not covered" > return false;</span>
}
}
<span class="cstat-no" title="statement not covered" > return true;</span>
} catch {
<span class="cstat-no" title="statement not covered" > return false;</span>
}
}
/**
* Extract variable names from template
*/
<span class="fstat-no" title="function not covered" > extractVariables(</span>template: string): string[] {
const variables = <span class="cstat-no" title="statement not covered" >new Set<string>();</span>
// Extract from {{variable}}
const variableMatches = <span class="cstat-no" title="statement not covered" >template.matchAll(/\{\{(\w+)\}\}/g);</span>
<span class="cstat-no" title="statement not covered" > for (const match of variableMatches) {</span>
<span class="cstat-no" title="statement not covered" > variables.add(match[1]);</span>
}
// Extract from {{#if variable}}
const conditionalMatches = <span class="cstat-no" title="statement not covered" >template.matchAll(/\{\{#if\s+(\w+)\}\}/g);</span>
<span class="cstat-no" title="statement not covered" > for (const match of conditionalMatches) {</span>
<span class="cstat-no" title="statement not covered" > variables.add(match[1]);</span>
}
<span class="cstat-no" title="statement not covered" > return Array.from(variables);</span>
}
}
</pre></td></tr></table></pre>
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