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import { argumentNotEmptyString } from "../safe";
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import { MapOf } from "../interfaces";
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import { TraceSource, DebugLevel } from "../log/TraceSource";
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import m = require("module");
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const trace = TraceSource.get(m.id);
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const splitRx = /(<%=|<%~|\[%~|\[%=|<%|\[%|%\]|%>)/;
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export enum TokenType {
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None,
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Text,
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OpenInlineBlock,
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OpenFilterBlock,
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OpenBlock,
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CloseBlock
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}
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const tokenMap: MapOf<TokenType> = {
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"<%": TokenType.OpenBlock,
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"[%": TokenType.OpenBlock,
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"<%=": TokenType.OpenInlineBlock,
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"[%=": TokenType.OpenInlineBlock,
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"<%~": TokenType.OpenFilterBlock,
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"[%~": TokenType.OpenFilterBlock,
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"%>": TokenType.CloseBlock,
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"%]": TokenType.CloseBlock
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};
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export interface ITemplateParser {
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next(): boolean;
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token(): TokenType;
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value(): string;
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}
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export class TemplateParser implements ITemplateParser {
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_tokens: string[];
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_pos = -1;
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_type: TokenType;
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_value: string | undefined;
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constructor(text: string) {
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argumentNotEmptyString(text, "text");
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this._tokens = text.split(splitRx);
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this._type = TokenType.None;
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}
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next() {
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this._pos++;
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if (this._pos < this._tokens.length) {
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this._value = this._tokens[this._pos];
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this._type = tokenMap[this._value] || TokenType.Text;
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return true;
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} else {
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this._type = TokenType.None;
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this._value = undefined;
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return false;
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}
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}
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token() {
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return this._type;
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}
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value() {
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if (this._value === undefined)
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throw new Error("The current token doesn't have a value");
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return this._value;
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}
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}
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