"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.evalQuotedToken = exports.evalToken = exports.Expression = void 0;
const assert_1 = require("../util/assert");
const literal_1 = require("../util/literal");
const TypeGuards = require("../util/type-guards");
const parse_string_literal_1 = require("../parser/parse-string-literal");
const underscore_1 = require("../util/underscore");
const error_1 = require("../util/error");
class Expression {
    constructor(tokens) {
        this.postfix = [...toPostfix(tokens)];
    }
    *evaluate(ctx, lenient) {
        (0, assert_1.assert)(ctx, 'unable to evaluate: context not defined');
        const operands = [];
        for (const token of this.postfix) {
            if (TypeGuards.isOperatorToken(token)) {
                const r = operands.pop();
                const l = operands.pop();
                const result = yield evalOperatorToken(ctx.opts.operators, token, l, r, ctx);
                operands.push(result);
            }
            else {
                operands.push(yield evalToken(token, ctx, lenient && this.postfix.length === 1));
            }
        }
        return operands[0];
    }
}
exports.Expression = Expression;
function evalToken(token, ctx, lenient = false) {
    if (TypeGuards.isPropertyAccessToken(token))
        return evalPropertyAccessToken(token, ctx, lenient);
    if (TypeGuards.isRangeToken(token))
        return evalRangeToken(token, ctx);
    if (TypeGuards.isLiteralToken(token))
        return evalLiteralToken(token);
    if (TypeGuards.isNumberToken(token))
        return evalNumberToken(token);
    if (TypeGuards.isWordToken(token))
        return token.getText();
    if (TypeGuards.isQuotedToken(token))
        return evalQuotedToken(token);
}
exports.evalToken = evalToken;
function evalPropertyAccessToken(token, ctx, lenient) {
    const props = token.props.map(prop => evalToken(prop, ctx, false));
    try {
        return ctx.get([token.propertyName, ...props]);
    }
    catch (e) {
        if (lenient && e.name === 'InternalUndefinedVariableError')
            return null;
        throw (new error_1.UndefinedVariableError(e, token));
    }
}
function evalNumberToken(token) {
    const str = token.whole.content + '.' + (token.decimal ? token.decimal.content : '');
    return Number(str);
}
function evalQuotedToken(token) {
    return (0, parse_string_literal_1.parseStringLiteral)(token.getText());
}
exports.evalQuotedToken = evalQuotedToken;
function evalOperatorToken(operators, token, lhs, rhs, ctx) {
    const impl = operators[token.operator];
    return impl(lhs, rhs, ctx);
}
function evalLiteralToken(token) {
    return literal_1.literalValues[token.literal];
}
function evalRangeToken(token, ctx) {
    const low = evalToken(token.lhs, ctx);
    const high = evalToken(token.rhs, ctx);
    return (0, underscore_1.range)(+low, +high + 1);
}
function* toPostfix(tokens) {
    const ops = [];
    for (const token of tokens) {
        if (TypeGuards.isOperatorToken(token)) {
            while (ops.length && ops[ops.length - 1].getPrecedence() > token.getPrecedence()) {
                yield ops.pop();
            }
            ops.push(token);
        }
        else
            yield token;
    }
    while (ops.length) {
        yield ops.pop();
    }
}
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