threepipe
Version:
A modern 3D viewer framework built on top of three.js, written in TypeScript, designed to make creating high-quality, modular, and extensible 3D experiences on the web simple and enjoyable.
47 lines (45 loc) • 1.93 kB
text/typescript
const warnEnabled = true // todo use ThreeViewer.ViewerDebugging
const errorStr1 = 'shaderReplaceString: str must be passed if str is a RegExp and append/prepend is true'
/**
* Replace a string in a shader function with added options to prepend, append, show warning when not found, and replace all occurrences.
* @param shader - shader code
* @param str - string to replace
* @param newStr - new string to replace with
* @param replaceAll - replace all occurrences
* @param prepend - prepend new string to old string
* @param append - append new string to old string
* @param _str - optional string to use for replacement. This must be passed if str is a RegExp and append/prepend is true
* @param warn - log an error in the console when unable to find the find string
*/
export function shaderReplaceString(shader: string, str: string|RegExp, newStr: string, {
replaceAll = false,
prepend = false,
append = false,
str: _str = undefined as string|undefined,
warn = true,
} = {}) {
// todo: use safeReplaceString from ts-browser-helpers
const isStr = typeof str === 'string'
if (warn && warnEnabled /* && ThreeViewer.ViewerDebugging */) {
if (isStr ? !shader.includes(str) : !str.test(shader)) {
console.error(`${str} not found in shader`)
return shader
}
}
let s = newStr
_str = _str ?? (isStr ? str : undefined)
if (prepend) {
if (typeof _str !== 'string') throw new Error(errorStr1)
s = newStr + _str
} else if (append) {
if (typeof _str !== 'string') throw new Error(errorStr1)
s = _str + newStr
}
return replaceAll ? shader.replaceAll(str, s) : shader.replace(str, s)
}
// todo use in material extension?
// /**
// * Regular expression for matching the `void main() {` opener line in GLSL.
// * @type {RegExp}
// */
// export const voidMainRegExp = /\bvoid\s+main\s*\(\s*\)\s*{/g