datetoken/dist/index.js

Parse relative datetime tokens into date objects

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// src/token/token.ts
function lookupIdentifier(ident) {
  if (keywords.hasOwnProperty(ident)) {
    return keywords[ident] ?? "ILLEGAL" /* ILLEGAL */;
  }
  return "ILLEGAL" /* ILLEGAL */;
}
var keywords, Token, NOW;
var init_token = __esm({
  "src/token/token.ts"() {
    "use strict";
    keywords = {
      now: "NOW" /* NOW */,
      s: "MODIFIER" /* MODIFIER */,
      m: "MODIFIER" /* MODIFIER */,
      h: "MODIFIER" /* MODIFIER */,
      d: "MODIFIER" /* MODIFIER */,
      w: "MODIFIER" /* MODIFIER */,
      M: "MODIFIER" /* MODIFIER */,
      Y: "MODIFIER" /* MODIFIER */,
      Q: "MODIFIER" /* MODIFIER */,
      Q1: "MODIFIER" /* MODIFIER */,
      Q2: "MODIFIER" /* MODIFIER */,
      Q3: "MODIFIER" /* MODIFIER */,
      Q4: "MODIFIER" /* MODIFIER */,
      bw: "MODIFIER" /* MODIFIER */,
      mon: "MODIFIER" /* MODIFIER */,
      tue: "MODIFIER" /* MODIFIER */,
      thu: "MODIFIER" /* MODIFIER */,
      fri: "MODIFIER" /* MODIFIER */,
      sat: "MODIFIER" /* MODIFIER */,
      sun: "MODIFIER" /* MODIFIER */
    };
    Token = class {
      type;
      literal;
      constructor(tokenType, tokenLiteral) {
        this.type = tokenType;
        this.literal = tokenLiteral;
      }
    };
    NOW = new Token("NOW" /* NOW */, "now");
  }
});

// src/token/index.ts
var init_token2 = __esm({
  "src/token/index.ts"() {
    "use strict";
    init_token();
  }
});

// src/ast/ast.ts
import * as dateFn from "date-fns";
function newNowExpression() {
  return new NowExpression(new Token("NOW" /* NOW */, "now"));
}
var daysOfWeek, NowExpression, ModifierExpression, SnapExpression, AmountModifiers, SnapModifiers;
var init_ast = __esm({
  "src/ast/ast.ts"() {
    "use strict";
    init_token2();
    daysOfWeek = ["sun", "mon", "tue", "wed", "thu", "fri", "sat"];
    NowExpression = class {
      token;
      constructor(token) {
        this.token = token;
      }
      operate(date) {
        return date;
      }
      toString() {
        return this.token.literal;
      }
      toJSON() {
        return { type: "now" };
      }
    };
    ModifierExpression = class {
      token;
      amount;
      operator;
      modifier;
      constructor(token, amount = 1, operator, modifier) {
        this.token = token;
        this.amount = amount;
        this.operator = operator;
        this.modifier = modifier;
      }
      operate(date) {
        switch (this.operator) {
          case "+" /* PLUS */:
            switch (this.modifier) {
              case "s":
                return dateFn.addSeconds(date, this.amount);
              case "m":
                return dateFn.addMinutes(date, this.amount);
              case "h":
                return dateFn.addHours(date, this.amount);
              case "d":
                return dateFn.addDays(date, this.amount);
              case "w":
                return dateFn.addWeeks(date, this.amount);
              case "M":
                return dateFn.addMonths(date, this.amount);
              case "Y":
                return dateFn.addYears(date, this.amount);
            }
            break;
          case "-" /* MINUS */:
            switch (this.modifier) {
              case "s":
                return dateFn.subSeconds(date, this.amount);
              case "m":
                return dateFn.subMinutes(date, this.amount);
              case "h":
                return dateFn.subHours(date, this.amount);
              case "d":
                return dateFn.subDays(date, this.amount);
              case "w":
                return dateFn.subWeeks(date, this.amount);
              case "M":
                return dateFn.subMonths(date, this.amount);
              case "Y":
                return dateFn.subYears(date, this.amount);
            }
            break;
        }
        return date;
      }
      toString() {
        return `${this.operator}${this.amount}${this.modifier}`;
      }
      toJSON() {
        return { type: "amount", amount: this.amount, modifier: this.modifier, operator: this.operator };
      }
    };
    SnapExpression = class {
      token;
      modifier;
      operator;
      constructor(token, modifier, operator) {
        this.token = token;
        this.modifier = modifier;
        this.operator = operator;
      }
      operate(date) {
        switch (this.operator) {
          case "/" /* SLASH */:
            switch (this.modifier) {
              case "s":
                return dateFn.startOfSecond(date);
              case "m":
                return dateFn.startOfMinute(date);
              case "h":
                return dateFn.startOfHour(date);
              case "d":
                return dateFn.startOfDay(date);
              case "w":
              case "bw":
                return dateFn.startOfWeek(date);
              case "mon":
              case "tue":
              case "wed":
              case "thu":
              case "fri":
              case "sat":
              case "sun": {
                const weekDayOrdinal = daysOfWeek.indexOf(this.modifier);
                const todayOrdinal = dateFn.getDay(date);
                const delta = ((todayOrdinal - weekDayOrdinal) % 7 + 7) % 7;
                return dateFn.subDays(date, delta);
              }
              case "M":
                return dateFn.startOfMonth(date);
              case "Y":
                return dateFn.startOfYear(date);
              case "Q":
                const month = dateFn.getMonth(date);
                const quarter = Math.floor(month / 3);
                return dateFn.setMonth(dateFn.startOfYear(date), 3 * quarter);
              case "Q1":
                return dateFn.startOfYear(date);
              case "Q2":
                return dateFn.setMonth(dateFn.startOfYear(date), 4 - 1);
              case "Q3":
                return dateFn.setMonth(dateFn.startOfYear(date), 7 - 1);
              case "Q4":
                return dateFn.setMonth(dateFn.startOfYear(date), 10 - 1);
            }
            break;
          case "@" /* AT */:
            switch (this.modifier) {
              case "s":
                return dateFn.endOfSecond(date);
              case "m":
                return dateFn.endOfMinute(date);
              case "h":
                return dateFn.endOfHour(date);
              case "d":
                return dateFn.endOfDay(date);
              case "w":
                return dateFn.endOfWeek(date);
              case "M":
                return dateFn.endOfMonth(date);
              case "Y":
                return dateFn.endOfYear(date);
              case "bw": {
                if (dateFn.isThisWeek(date) && !dateFn.isWeekend(date)) {
                  return date;
                }
                return dateFn.endOfDay(dateFn.addDays(dateFn.startOfWeek(date), 5));
              }
              case "mon":
              case "tue":
              case "wed":
              case "thu":
              case "fri":
              case "sat":
              case "sun": {
                const weekDayOrdinal = daysOfWeek.indexOf(this.modifier);
                const todayOrdinal = dateFn.getDay(date);
                const delta = ((weekDayOrdinal - todayOrdinal) % 7 + 7) % 7;
                return dateFn.addDays(date, delta);
              }
              case "Q":
                const month = dateFn.getMonth(date);
                const quarter = Math.floor(month / 3);
                return dateFn.endOfMonth(dateFn.setMonth(date, 3 * quarter + 2));
              case "Q1":
                return dateFn.endOfMonth(dateFn.setMonth(date, 3 - 1));
              case "Q2":
                return dateFn.endOfMonth(dateFn.setMonth(date, 6 - 1));
              case "Q3":
                return dateFn.endOfMonth(dateFn.setMonth(date, 9 - 1));
              case "Q4":
                return dateFn.endOfMonth(dateFn.setMonth(date, 12 - 1));
            }
            break;
        }
        return date;
      }
      toString() {
        return `${this.operator}${this.modifier}`;
      }
      toJSON() {
        return { type: "snap", modifier: this.modifier, operator: this.operator };
      }
    };
    ((AmountModifiers2) => {
      const values = ["s", "m", "h", "d", "w", "M", "Y"];
      AmountModifiers2.valuesString = `(${values.map((v) => `"${v}"`).join(",")})`;
      function checkModifier(modifier) {
        return values.includes(modifier);
      }
      AmountModifiers2.checkModifier = checkModifier;
    })(AmountModifiers || (AmountModifiers = {}));
    ((SnapModifiers2) => {
      const values = [
        "s",
        "m",
        "h",
        "d",
        "w",
        "bw",
        "M",
        "Y",
        "mon",
        "tue",
        "wed",
        "thu",
        "fri",
        "sat",
        "sun",
        "Q",
        "Q1",
        "Q2",
        "Q3",
        "Q4"
      ];
      SnapModifiers2.valuesString = `(${values.map((v) => `"${v}"`).join(",")})`;
      function checkModifier(modifier) {
        return values.includes(modifier);
      }
      SnapModifiers2.checkModifier = checkModifier;
    })(SnapModifiers || (SnapModifiers = {}));
  }
});

// src/ast/index.ts
var init_ast2 = __esm({
  "src/ast/index.ts"() {
    "use strict";
    init_ast();
  }
});

// src/exceptions/index.ts
var InvalidTokenError;
var init_exceptions = __esm({
  "src/exceptions/index.ts"() {
    "use strict";
    InvalidTokenError = class extends Error {
    };
  }
});

// src/lexer/lexer.ts
function isDigit(payload) {
  return /^\d+$/.test(payload);
}
function isLetter(payload) {
  return /^\w+$/.test(payload);
}
var Lexer;
var init_lexer = __esm({
  "src/lexer/lexer.ts"() {
    "use strict";
    init_token2();
    Lexer = class {
      invalid;
      position;
      readPosition;
      input;
      currentChar;
      constructor(input = "") {
        this.invalid = !input || "string" !== typeof input || input.trim().length < 2;
        if (this.invalid) {
          this.position = this.readPosition = 0;
          this.input = "";
          this.currentChar = "";
        } else {
          this.position = this.readPosition = 0;
          this.input = input.trim();
          this.currentChar = "";
          this.readChar();
        }
      }
      isInvalid() {
        return this.invalid;
      }
      nextToken() {
        let token;
        if (this.currentChar === "") {
          return new Token("" /* END */, this.currentChar);
        } else if (this.currentChar === "+") {
          token = new Token("+" /* PLUS */, this.currentChar);
        } else if (this.currentChar === "-") {
          token = new Token("-" /* MINUS */, this.currentChar);
        } else if (this.currentChar === "/") {
          token = new Token("/" /* SLASH */, this.currentChar);
        } else if (this.currentChar === "@") {
          token = new Token("@" /* AT */, this.currentChar);
        } else if (isDigit(this.currentChar)) {
          return new Token("NUMBER" /* NUMBER */, this.readNumber());
        } else if (isLetter(this.currentChar)) {
          const literal = this.readWord();
          return new Token(lookupIdentifier(literal), literal);
        } else {
          token = new Token("ILLEGAL" /* ILLEGAL */, this.currentChar);
        }
        this.readChar();
        return token;
      }
      readChar() {
        if (this.position >= this.input.length) {
          this.readPosition = 0;
          this.currentChar = "";
        } else {
          this.currentChar = this.input[this.readPosition] ?? "";
          this.position = this.readPosition;
        }
        this.readPosition++;
      }
      peekChar() {
        if (this.position >= this.input.length) {
          return "";
        }
        return this.input[this.readPosition] ?? "";
      }
      readNumber() {
        const pos = this.position;
        while (isDigit(this.currentChar)) {
          this.readChar();
        }
        return this.input.substring(pos, this.position);
      }
      readWord() {
        const pos = this.position;
        while (isLetter(this.currentChar) || isDigit(this.currentChar)) {
          this.readChar();
        }
        return this.input.substring(pos, this.position);
      }
    };
  }
});

// src/lexer/index.ts
var init_lexer2 = __esm({
  "src/lexer/index.ts"() {
    "use strict";
    init_lexer();
  }
});

// src/parser/parser.ts
var Parser;
var init_parser = __esm({
  "src/parser/parser.ts"() {
    "use strict";
    init_ast2();
    init_ast2();
    init_token2();
    Parser = class {
      lexer;
      errors;
      currentToken;
      peekToken;
      constructor(lexer) {
        this.errors = [];
        this.lexer = lexer;
      }
      getErrors() {
        return this.errors;
      }
      nextToken() {
        this.currentToken = this.peekToken;
        this.peekToken = this.lexer.nextToken();
      }
      parse() {
        if (this.lexer.isInvalid()) {
          this.addError("Invalid token");
        }
        const nodes = [];
        this.nextToken();
        this.nextToken();
        while (this.currentToken.type !== "" /* END */) {
          const node = this.parseExpression();
          if (node) {
            nodes.push(node);
          }
          this.nextToken();
        }
        return nodes;
      }
      addError(message) {
        this.errors.push(message);
      }
      parseNowExpression() {
        return newNowExpression();
      }
      parseModifierExpression() {
        let curToken = this.currentToken;
        const operator = curToken.literal;
        let amount = 1;
        let modifier;
        this.nextToken();
        curToken = this.currentToken;
        if (curToken.type === "NUMBER" /* NUMBER */) {
          amount = parseInt(curToken.literal, 10);
          this.nextToken();
        }
        curToken = this.currentToken;
        if (curToken.type === "MODIFIER" /* MODIFIER */) {
          modifier = curToken.literal;
          if (!AmountModifiers.checkModifier(modifier)) {
            this.addError(
              `Expected modifier literal as any of "${AmountModifiers.valuesString}", got "${curToken.literal}"`
            );
          }
          return new ModifierExpression(curToken, amount, operator, modifier);
        } else {
          this.addError(`Expected NUMBER or MODIFIER, got "${curToken.literal}"`);
        }
        return void 0;
      }
      parseSnapExpression() {
        let curToken = this.currentToken;
        const operator = curToken.literal;
        this.nextToken();
        curToken = this.currentToken;
        if (curToken.type !== "MODIFIER" /* MODIFIER */) {
          this.addError(`Expected snap modifier literal, got "${curToken.literal}"`);
        } else if (!SnapModifiers.checkModifier(curToken.literal)) {
          this.addError(
            `Expected snap modifier literal as any of "${SnapModifiers.valuesString}", got "${curToken.literal}"`
          );
        }
        const modifier = curToken.literal;
        return new SnapExpression(curToken, modifier, operator);
      }
      parseExpression() {
        const curToken = this.currentToken;
        if ("NOW" /* NOW */ === curToken.type) {
          return this.parseNowExpression();
        } else if ("+" /* PLUS */ === curToken.type || "-" /* MINUS */ === curToken.type) {
          return this.parseModifierExpression();
        } else if ("/" /* SLASH */ === curToken.type || "@" /* AT */ === curToken.type) {
          return this.parseSnapExpression();
        } else if ("ILLEGAL" /* ILLEGAL */ === curToken.type) {
          this.addError(`Illegal operator: "${curToken.literal}"`);
        }
        return void 0;
      }
    };
  }
});

// src/parser/index.ts
var init_parser2 = __esm({
  "src/parser/index.ts"() {
    "use strict";
    init_parser();
  }
});

// src/utils/time.ts
var Clock;
var init_time = __esm({
  "src/utils/time.ts"() {
    "use strict";
    Clock = class _Clock {
      getTime() {
        return /* @__PURE__ */ new Date();
      }
      forward(millis) {
        return /* @__PURE__ */ new Date();
      }
      static create() {
        return new _Clock();
      }
    };
  }
});

// src/models/models.ts
var Token3;
var init_models = __esm({
  "src/models/models.ts"() {
    "use strict";
    init_ast2();
    init_exceptions();
    init_lexer2();
    init_parser2();
    init_time();
    Token3 = class _Token {
      get at() {
        return this.startAt || this.clock.getTime();
      }
      set at(value) {
        this.startAt = value;
      }
      get nodes() {
        return this.expressionNodes;
      }
      get isSnapped() {
        return this.expressionNodes.some((node) => node instanceof SnapExpression);
      }
      get isModified() {
        return this.expressionNodes.some((node) => node instanceof ModifierExpression);
      }
      static fromString(value, at, clock) {
        const lexer = new Lexer(value);
        const parser = new Parser(lexer);
        const nodes = parser.parse();
        if (parser.getErrors().length > 0) {
          throw new InvalidTokenError(parser.getErrors().join("\n"));
        }
        const token = new _Token(nodes);
        if (at) {
          token.startAt = at;
        }
        if (clock) {
          token.clock = clock;
        }
        return token;
      }
      expressionNodes;
      startAt;
      clock = Clock.create();
      constructor(nodes, at, clock = Clock.create()) {
        this.expressionNodes = nodes;
        if (at !== void 0) {
          this.startAt = at;
        }
        this.clock = clock;
      }
      toDate() {
        return this.expressionNodes.reduce((acc, node) => node.operate(acc), this.at);
      }
      toString() {
        return this.expressionNodes.map((n) => n.toString()).join("");
      }
      toJSON() {
        return this.nodes.map((node) => node.toJSON());
      }
    };
  }
});

// src/models/index.ts
var models_exports = {};
__export(models_exports, {
  Token: () => Token3,
  TokenModel: () => Token3
});
var init_models2 = __esm({
  "src/models/index.ts"() {
    "use strict";
    init_models();
  }
});

// src/utils/utils.ts
init_models2();
function tokenToDate(token, at, clock) {
  return Token3.fromString(token, at, clock).toDate();
}

// src/index.ts
init_models2();
var datetoken = tokenToDate;
var index_default = tokenToDate;
if (typeof module !== "undefined" && typeof module.exports !== "undefined") {
  module.exports = tokenToDate;
  module.exports.datetoken = tokenToDate;
  module.exports.Token = (init_models2(), __toCommonJS(models_exports)).Token;
}
export {
  Token3 as Token,
  datetoken,
  index_default as default
};