swift-pattern-compiler
Version:
A compiler which transforms SWIFT patterns to an object representation with additional information's.
84 lines • 2.88 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
const interfaces_1 = require("./interfaces");
const regExpFactory = (regExp) => (n) => regExp.test(n);
const isNumber = regExpFactory(/[0-9]/);
const isChar = regExpFactory(/[a-z]/);
const isQuant = regExpFactory(/[!\-]/);
const isMultilineQuant = regExpFactory(/[*]/);
const isSign = regExpFactory(/[/:]/);
const isBracket = regExpFactory(/[\[\]]/);
const isParen = regExpFactory(/[()]/);
const isNewline = regExpFactory(/\n/);
const isConst = regExpFactory(/[A-Z]/);
/**
* The tokenizer accepts a SWIFT field pattern and returns an array of tokens.
*
* ```
* const tokens = tokenizer("35a");
* // => [{ type: "num", value: "35" }, { type: "char", value: "a" }]
* ```
*
* @param input the SWIFT field pattern string
* @returns the tokens array
*/
exports.tokenizer = (input) => {
const tokens = [];
let current = 0;
input = input || "";
while (current < input.length) {
let char = input[current];
current++;
if (isNumber(char)) {
let value = char;
char = input[current];
while (isNumber(char)) {
value += char;
char = input[++current];
}
tokens.push({ type: interfaces_1.ETokenType.num, value });
continue;
}
if (isChar(char)) {
tokens.push({ type: interfaces_1.ETokenType.char, value: char });
continue;
}
if (isQuant(char)) {
tokens.push({ type: interfaces_1.ETokenType.quant, value: char });
continue;
}
if (isMultilineQuant(char)) {
tokens.push({ type: interfaces_1.ETokenType.multilineQuant, value: char });
continue;
}
if (isSign(char)) {
tokens.push({ type: interfaces_1.ETokenType.sign, value: char });
continue;
}
if (isBracket(char)) {
tokens.push({ type: interfaces_1.ETokenType.bracket, value: char });
continue;
}
if (isParen(char)) {
tokens.push({ type: interfaces_1.ETokenType.paren, value: char });
continue;
}
if (isNewline(char)) {
tokens.push({ type: interfaces_1.ETokenType.newline, value: char });
continue;
}
if (isConst(char)) {
let value = char;
char = input[current];
while (isConst(char)) {
value += char;
char = input[++current];
}
tokens.push({ type: interfaces_1.ETokenType.const, value });
continue;
}
throw new Error(`Unmatched character "${char}"`);
}
return tokens;
};
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