@ogs-gmbh/ngx-template-engine
Version:
A library providing a flexible and efficient template engine for dynamic content rendering. It enables easy integration of customizable templates within Angular applications.
59 lines • 10.3 kB
JavaScript
import { CharKind } from "./chars";
import { createAstTemplateIndexNode, createAstTemplatePropertyNode, createAstTextNode } from "./ast";
import { getCharDescriptor } from "./utils";
function parseAst(value) {
const splittedValue = value.split("");
if (splittedValue.length === 0)
throw new Error("Error processing a zero length data sequence");
const astNodes = [];
let sequence = null;
let lastCharKind = null;
let detectedAstMode = null;
splittedValue.forEach((char, index) => {
const charDescriptor = getCharDescriptor(char);
if (charDescriptor === null) {
sequence === null ? sequence = char : sequence += char;
if (index === splittedValue.length - 1) {
astNodes.push(createAstTextNode(sequence));
sequence = null;
}
return;
}
switch (charDescriptor.kind) {
case CharKind.START: {
if (lastCharKind !== null && lastCharKind !== CharKind.END)
throw new Error(`Expected an end char kind, but got a start char kind at index ${index} instead`);
if (sequence !== null) {
astNodes.push(createAstTextNode(sequence));
sequence = null;
}
break;
}
case CharKind.END: {
if (sequence === null)
throw new Error(`Unexpected end at index ${index}. Expected a index or keyword property`);
if (lastCharKind !== CharKind.START)
throw new Error(`Expected start char kind to be ${CharKind.START}, but got ${lastCharKind} instead`);
const indexSequence = Number(sequence);
const nodeAstMode = Number.isNaN(indexSequence) ? "property" : "index";
if (detectedAstMode !== null && detectedAstMode !== nodeAstMode)
throw new Error(`Expected to have only ${detectedAstMode}-based template variables, but got a ${nodeAstMode}-based instead`);
detectedAstMode ??= nodeAstMode;
astNodes.push(detectedAstMode === "index"
? createAstTemplateIndexNode(indexSequence)
: createAstTemplatePropertyNode(sequence));
sequence = null;
break;
}
}
lastCharKind = charDescriptor.kind;
});
if (detectedAstMode === null)
throw new Error(`Expected template to have at least 1 index- or property-based variable`);
return {
mode: detectedAstMode,
nodes: astNodes
};
}
export { parseAst };
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