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import Parse from './parse.ts'
/* TYPES */
import type { EtaConfig } from './config.ts'import type { AstObject } from './parse.ts'
/* END TYPES */
/** * Compiles a template string to a function string. Most often users just use `compile()`, which calls `compileToString` and creates a new function using the result * * **Example** * * ```js * compileToString("Hi <%= it.user %>", eta.config) * // "var tR='',include=E.include.bind(E),includeFile=E.includeFile.bind(E);tR+='Hi ';tR+=E.e(it.user);if(cb){cb(null,tR)} return tR" * ``` */
export default function compileToString(str: string, config: EtaConfig): string {  const buffer: Array<AstObject> = Parse(str, config)
  let res =    "var tR='',__l,__lP" +    (config.include ? ',include=E.include.bind(E)' : '') +    (config.includeFile ? ',includeFile=E.includeFile.bind(E)' : '') +    '\nfunction layout(p,d){__l=p;__lP=d}\n' +    (config.useWith ? 'with(' + config.varName + '||{}){' : '') +    compileScope(buffer, config) +    (config.includeFile      ? 'if(__l)tR=' +        (config.async ? 'await ' : '') +        `includeFile(__l,Object.assign(${config.varName},{body:tR},__lP))\n`      : config.include      ? 'if(__l)tR=' +        (config.async ? 'await ' : '') +        `include(__l,Object.assign(${config.varName},{body:tR},__lP))\n`      : '') +    'if(cb){cb(null,tR)} return tR' +    (config.useWith ? '}' : '')
  if (config.plugins) {    for (let i = 0; i < config.plugins.length; i++) {      const plugin = config.plugins[i]      if (plugin.processFnString) {        res = plugin.processFnString(res, config)      }    }  }
  return res}
/** * Loops through the AST generated by `parse` and transform each item into JS calls * * **Example** * * ```js * // AST version of 'Hi <%= it.user %>' * let templateAST = ['Hi ', { val: 'it.user', t: 'i' }] * compileScope(templateAST, eta.config) * // "tR+='Hi ';tR+=E.e(it.user);" * ``` */
function compileScope(buff: Array<AstObject>, config: EtaConfig) {  let i = 0  const buffLength = buff.length  let returnStr = ''
  for (i; i < buffLength; i++) {    const currentBlock = buff[i]    if (typeof currentBlock === 'string') {      const str = currentBlock
      // we know string exists      returnStr += "tR+='" + str + "'\n"    } else {      const type = currentBlock.t // ~, s, !, ?, r      let content = currentBlock.val || ''
      if (type === 'r') {        // raw
        if (config.filter) {          content = 'E.filter(' + content + ')'        }
        returnStr += 'tR+=' + content + '\n'      } else if (type === 'i') {        // interpolate
        if (config.filter) {          content = 'E.filter(' + content + ')'        }
        if (config.autoEscape) {          content = 'E.e(' + content + ')'        }        returnStr += 'tR+=' + content + '\n'        // reference      } else if (type === 'e') {        // execute        returnStr += content + '\n' // you need a \n in case you have <% } %>      }    }  }
  return returnStr}