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import { FormatScanner, TokeType } from "./FormatScanner";
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import { isNullOrEmptyString, isPrimitive, get } from "../safe";
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import { TextWriter, MapOf } from "../interfaces";
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type CompiledPattern = (writer: TextWriter, args: any) => void;
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export class FormatCompiler {
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_scanner: FormatScanner;
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static _cache: MapOf<CompiledPattern> = {};
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_parts: Array<string | { name: string; format?: string; }>;
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constructor(scanner: FormatScanner) {
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this._scanner = scanner;
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this._parts = [];
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}
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compile() {
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this.visitText();
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const parts = this._parts;
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return (writer: TextWriter, args: any) => {
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parts.forEach(x => {
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if (isPrimitive(x))
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writer.writeValue(x);
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else
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writer.writeValue(get(x.name, args), x.format);
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});
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};
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}
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static compile(pattern: string) {
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let compiledPattern = this._cache && this._cache[pattern];
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if (!compiledPattern) {
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const compiler = new this(new FormatScanner(pattern));
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compiledPattern = compiler.compile();
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this._cache[pattern] = compiledPattern;
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}
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return compiledPattern;
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}
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visitText() {
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while (this._scanner.next()) {
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// console.log(this._scanner.getTokenType(), this._scanner.getTokenValue());
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switch (this._scanner.getTokenType()) {
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case TokeType.CurlOpen:
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this.visitCurlOpen();
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break;
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case TokeType.CurlClose:
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this.visitCurlClose();
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break;
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default:
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this.pushText(this._scanner.getTokenValue());
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}
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}
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}
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visitCurlClose() {
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if (!this._scanner.next())
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this.dieUnexpectedEnd("}");
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if (this._scanner.getTokenType() !== TokeType.CurlClose)
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this.dieUnexpectedToken("}");
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this.pushText("}");
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}
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visitCurlOpen() {
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if (!this._scanner.next())
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this.dieUnexpectedEnd("{ | TEXT");
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if (this._scanner.getTokenType() === TokeType.CurlOpen)
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this.pushText("{");
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else
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this.visitTemplateSubst();
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}
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visitTemplateSubst() {
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if (this._scanner.getTokenType() !== TokeType.Text)
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this.dieUnexpectedToken("TEXT");
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const fieldName = this._scanner.getTokenValue();
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const filedFormat = this.readColon() ? this.readFieldFormat() : undefined;
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if (this._scanner.getTokenType() !== TokeType.CurlClose)
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this.dieUnexpectedToken("}");
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this.pushSubst(fieldName, filedFormat);
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}
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readFieldFormat() {
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const parts = new Array<string>();
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do {
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if (this._scanner.getTokenType() === TokeType.CurlClose) {
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return parts.join("");
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} else {
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parts.push(this._scanner.getTokenValue());
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}
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} while (this._scanner.next());
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this.dieUnexpectedEnd("}");
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}
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readColon() {
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if (!this._scanner.next())
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this.dieUnexpectedEnd();
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if (this._scanner.getTokenType() !== TokeType.Colon)
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return false;
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if (!this._scanner.next())
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this.dieUnexpectedEnd();
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return true;
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}
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pushSubst(fieldName: string, filedFormat?: string) {
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// console.log("pushSubst ", fieldName, filedFormat);
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this._parts.push({ name: fieldName, format: filedFormat });
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}
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pushText(text: string) {
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this._parts.push(text);
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}
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dieUnexpectedToken(expected?: string): never {
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throw new Error(isNullOrEmptyString(expected) ?
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`Unexpected token ${this._scanner.getTokenValue()}` :
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`Unexpected token ${this._scanner.getTokenValue()}, expected ${expected}`
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);
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}
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dieUnexpectedEnd(expected?: string): never {
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throw new Error(isNullOrEmptyString(expected) ? "Unexpected end of the string" : `Unexpected end of the string, expected ${expected}`);
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}
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}
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