@antv/util/lib/path/parser/scan-param.js

> AntV 底层依赖的工具库，不建议在自己业务中使用。

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.scanParam = scanParam;
var is_digit_start_1 = require("./is-digit-start");
/**
 * Validates every character of the path string,
 * every path command, negative numbers or floating point numbers.
 */
function scanParam(path) {
    var max = path.max, pathValue = path.pathValue, start = path.index;
    var index = start;
    var zeroFirst = false;
    var hasCeiling = false;
    var hasDecimal = false;
    var hasDot = false;
    var ch;
    if (index >= max) {
        // path.err = 'SvgPath: missed param (at pos ' + index + ')';
        path.err = "[path-util]: Invalid path value at index ".concat(index, ", \"pathValue\" is missing param");
        return;
    }
    ch = pathValue.charCodeAt(index);
    if (ch === 0x2b /* + */ || ch === 0x2d /* - */) {
        index += 1;
        // ch = (index < max) ? pathValue.charCodeAt(index) : 0;
        ch = pathValue.charCodeAt(index);
    }
    // This logic is shamelessly borrowed from Esprima
    // https://github.com/ariya/esprimas
    if (!(0, is_digit_start_1.isDigit)(ch) && ch !== 0x2e /* . */) {
        // path.err = 'SvgPath: param should start with 0..9 or `.` (at pos ' + index + ')';
        path.err = "[path-util]: Invalid path value at index ".concat(index, ", \"").concat(pathValue[index], "\" is not a number");
        return;
    }
    if (ch !== 0x2e /* . */) {
        zeroFirst = ch === 0x30 /* 0 */;
        index += 1;
        ch = pathValue.charCodeAt(index);
        if (zeroFirst && index < max) {
            // decimal number starts with '0' such as '09' is illegal.
            if (ch && (0, is_digit_start_1.isDigit)(ch)) {
                // path.err = 'SvgPath: numbers started with `0` such as `09`
                // are illegal (at pos ' + start + ')';
                path.err = "[path-util]: Invalid path value at index ".concat(start, ", \"").concat(pathValue[start], "\" illegal number");
                return;
            }
        }
        while (index < max && (0, is_digit_start_1.isDigit)(pathValue.charCodeAt(index))) {
            index += 1;
            hasCeiling = true;
        }
        ch = pathValue.charCodeAt(index);
    }
    if (ch === 0x2e /* . */) {
        hasDot = true;
        index += 1;
        while ((0, is_digit_start_1.isDigit)(pathValue.charCodeAt(index))) {
            index += 1;
            hasDecimal = true;
        }
        ch = pathValue.charCodeAt(index);
    }
    if (ch === 0x65 /* e */ || ch === 0x45 /* E */) {
        if (hasDot && !hasCeiling && !hasDecimal) {
            path.err = "[path-util]: Invalid path value at index ".concat(index, ", \"").concat(pathValue[index], "\" invalid float exponent");
            return;
        }
        index += 1;
        ch = pathValue.charCodeAt(index);
        if (ch === 0x2b /* + */ || ch === 0x2d /* - */) {
            index += 1;
        }
        if (index < max && (0, is_digit_start_1.isDigit)(pathValue.charCodeAt(index))) {
            while (index < max && (0, is_digit_start_1.isDigit)(pathValue.charCodeAt(index))) {
                index += 1;
            }
        }
        else {
            path.err = "[path-util]: Invalid path value at index ".concat(index, ", \"").concat(pathValue[index], "\" invalid integer exponent");
            return;
        }
    }
    path.index = index;
    path.param = +path.pathValue.slice(start, index);
}
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