* Return the next token object * * @param {string} decimalCharacter The decimal character to use in the float numbers * @returns {Token}
(decimalCharacter = '.')
| 65 | * @returns {Token} |
| 66 | */ |
| 67 | getNextToken(decimalCharacter = '.') { |
| 68 | this._skipSpaces(); |
| 69 | |
| 70 | // Test for the end of text |
| 71 | if (this.textLength === this.index) { |
| 72 | this.token.type = 'EOT'; // End of text |
| 73 | |
| 74 | return this.token; |
| 75 | } |
| 76 | |
| 77 | // If the current character is a digit read a number |
| 78 | if (AutoNumericHelper.isDigit(this.text[this.index])) { |
| 79 | this.token.type = 'num'; |
| 80 | this.token.value = this._getNumber(decimalCharacter); |
| 81 | |
| 82 | return this.token; |
| 83 | } |
| 84 | |
| 85 | // Check if the current character is an operator or parentheses |
| 86 | this.token.type = 'Error'; |
| 87 | switch (this.text[this.index]) { |
| 88 | case '+': this.token.type = '+'; break; |
| 89 | case '-': this.token.type = '-'; break; |
| 90 | case '*': this.token.type = '*'; break; |
| 91 | case '/': this.token.type = '/'; break; |
| 92 | case '(': this.token.type = '('; break; |
| 93 | case ')': this.token.type = ')'; break; |
| 94 | } |
| 95 | |
| 96 | if (this.token.type !== 'Error') { |
| 97 | this.token.symbol = this.text[this.index]; |
| 98 | this.index++; |
| 99 | } else { |
| 100 | throw new Error(`Unexpected token '${this.token.symbol}' at position '${this.token.index}' in the token function`); |
| 101 | } |
| 102 | |
| 103 | return this.token; |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * Return the integer or float number starting from the `this.index` string index |