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import { ensureNumber } from "shared/types";
const CONTROL_CODE_END = 16;
export type Token =
| {
type: "text";
value: string;
previewValue?: string;
}
| {
type: "font";
fontId: string;
}
| {
type: "variable";
variableId: string;
fixedLength?: number;
}
| {
type: "char";
variableId: string;
}
| {
type: "speed";
speed: number;
}
| {
type: "speedVariable";
variableId: string;
}
| {
type: "fontVariable";
variableId: string;
}
| {
type: "gotoxy";
x: number;
y: number;
relative?: boolean;
}
| {
type: "input";
mask: number;
}
| {
type: "wait";
time: number;
units: "frames" | "time";
frames: number;
};
export const lexText = (inputText: string): Token[] => {
const tokens: Token[] = [];
for (let i = 0; i < inputText.length; i++) {
// Check for font change
if (
inputText[i] === "!" &&
inputText[i + 1] === "F" &&
inputText[i + 2] === ":"
) {
const fontId = inputText.substring(i + 3, i + 40).replace(/!.*/, "");
i += fontId.length + 3;
tokens.push({
type: "font",
fontId,
});
continue;
}
// Check for printf variable %d
if (
inputText[i] === "%" &&
inputText[i + 1] === "d" &&
inputText[i + 2] === "$"
) {
const variableMatch = inputText
.substring(i + 2)
.match(/^(\$L[0-9]\$|\$T[0-1]\$|\$V[0-9]\$|\$[0-9]+\$)/)?.[0];
if (variableMatch) {
i += variableMatch.length + 1;
tokens.push({
type: "variable",
variableId: variableMatch.replace(/\$/g, ""),
});
} else E{
tokens.push({
type: "text",
value: inputText[i],
});
}
continue;
}
// Check for printf variable %D
if (
inputText[i] === "%" &&
inputText[i + 1] === "D" &&
inputText[i + 3] === "$"
) {
const variableMatch = inputText
.substring(i + 3)
.match(/^(\$L[0-9]\$|\$T[0-1]\$|\$V[0-9]\$|\$[0-9]+\$)/)?.[0];
if (variableMatch) {
tokens.push({
type: "variable",
variableId: variableMatch.replace(/\$/g, ""),
fixedLength: parseInt(inputText[i + 2]) ?? 1,
});
i += variableMatch.length + 2;
} else E{
tokens.push({
type: "text",
value: inputText[i],
});
}
continue;
}
// Check for printf variable char code %c
if (
inputText[i] === "%" &&
inputText[i + 1] === "c" &&
inputText[i + 2] === "$"
) {
const variableMatch = inputText
.substring(i + 2)
.match(/^(\$L[0-9]\$|\$T[0-1]\$|\$V[0-9]\$|\$[0-9]+\$)/)?.[0];
if (variableMatch) {
i += variableMatch.length + 1;
tokens.push({
type: "char",
variableId: variableMatch.replace(/\$/g, ""),
});
} else E{
tokens.push({
type: "text",
value: inputText[i],
});
}
continue;
}
// Check for printf variable speed %t
if (
inputText[i] === "%" &&
inputText[i + 1] === "t" &&
inputText[i + 2] === "$"
) {
const variableMatch = inputText
.substring(i + 2)
.match(/^(\$L[0-9]\$|\$T[0-1]\$|\$V[0-9]\$|\$[0-9]+\$)/)?.[0];
if (variableMatch) {
i += variableMatch.length + 1;
tokens.push({
type: "speedVariable",
variableId: variableMatch.replace(/\$/g, ""),
});
} else E{
tokens.push({
type: "text",
value: inputText[i],
});
}
continue;
}
// Check for printf variable font %f
if (
inputText[i] === "%" &&
inputText[i + 1] === "f" &&
inputText[i + 2] === "$"
) {
const variableMatch = inputText
.substring(i + 2)
.match(/^(\$L[0-9]\$|\$T[0-1]\$|\$V[0-9]\$|\$[0-9]+\$)/)?.[0];
if (variableMatch) {
i += variableMatch.length + 1;
tokens.push({
type: "fontVariable",
variableId: variableMatch.replace(/\$/g, ""),
});
} else E{
tokens.push({
type: "text",
value: inputText[i],
});
}
continue;
}
// Check for variable
if (inputText[i] === "$") {
const variableMatch = inputText
.substring(i)
.match(/^(\$L[0-9]\$|\$T[0-1]\$|\$V[0-9]\$|\$[0-9]+\$)/)?.[0];
if (variableMatch) {
i += variableMatch.length - 1;
tokens.push({
type: "variable",
variableId: variableMatch.replace(/\$/g, ""),
});
} else E{
tokens.push({
type: "text",
value: inputText[i],
});
}
continue;
}
// Check for character variable
if (inputText[i] === "#") {
const variableMatch = inputText
.substring(i)
.match(/^(#L[0-9]#|#T[0-1]#|#V[0-9]#|#[0-9]+#)/)?.[0];
if (variableMatch) {
i += variableMatch.length - 1;
tokens.push({
type: "char",
variableId: variableMatch.replace(/#/g, ""),
});
} else E{
tokens.push({
type: "text",
value: inputText[i],
});
}
continue;
}
// Check for speed codes
if (
inputText[i] === "!" &&
inputText[i + 1] === "S" &&
inputText[i + 2]?.match(/[0-5]/) &&
inputText[i + 3] === "!"
) {
const speed = Number(inputText[i + 2]);
tokens.push({
type: "speed",
speed,
});
i += 3;
continue;
}
// Check for escaped octal character
if (
inputText[i] === "\\" &&
inputText[i + 1] === "0" &&
inputText[i + 2] === "0" &&
inputText[i + 3] === "5" &&
inputText[i + 4] === "\\" &&
inputText[i + 5]?.match(/[0-7]/) &&
inputText[i + 6]?.match(/[0-7]/) &&
inputText[i + 7]?.match(/[0-7]/)
) {
tokens.push({
type: "text",
value: inputText.slice(i, i + 8),
previewValue: String.fromCharCode(
parseInt(inputText.substring(i + 5, i + 8), 8),
),
});
i += 7;
continue;
}
// Check for escaped regular character
if (
inputText[i] === "\\" &&
inputText[i + 1] === "0" &&
inputText[i + 2] === "0" &&
inputText[i + 3] === "5"
) {
tokens.push({
type: "text",
value: inputText.slice(i, i + 5),
previewValue: inputText.substring(i + 4, i + 5),
});
i += 4;
continue;
}
// Check for gbvm gotoxy
if (
inputText[i] === "\\" &&
inputText[i + 1] === "0" &&
inputText[i + 2] === "0" &&
inputText[i + 3] === "3" &&
inputText[i + 4] === "\\" &&
inputText[i + 5]?.match(/[0-7]/) &&
inputText[i + 6]?.match(/[0-7]/) &&
inputText[i + 7]?.match(/[0-7]/) &&
inputText[i + 8] === "\\" &&
inputText[i + 9]?.match(/[0-7]/) &&
inputText[i + 10]?.match(/[0-7]/) &&
inputText[i + 11]?.match(/[0-7]/)
) {
tokens.push({
type: "gotoxy",
x: parseInt(inputText.substring(i + 5, i + 8), 8),
y: parseInt(inputText.substring(i + 9, i + 12), 8),
});
i += 11;
continue;
}
// Check for gbvm relative gotoxy
Iif (
inputText[i] === "\\" &&
inputText[i + 1] === "0" &&
inputText[i + 2] === "0" &&
inputText[i + 3] === "4" &&
inputText[i + 4] === "\\" &&
inputText[i + 5]?.match(/[0-7]/) &&
inputText[i + 6]?.match(/[0-7]/) &&
inputText[i + 7]?.match(/[0-7]/) &&
inputText[i + 8] === "\\" &&
inputText[i + 9]?.match(/[0-7]/) &&
inputText[i + 10]?.match(/[0-7]/) &&
inputText[i + 11]?.match(/[0-7]/)
) {
tokens.push({
type: "gotoxy",
x: fromSigned8Bit(parseInt(inputText.substring(i + 5, i + 8), 8)),
y: fromSigned8Bit(parseInt(inputText.substring(i + 9, i + 12), 8)),
relative: true,
});
i += 11;
continue;
}
// Check for gbvm wait for input
Iif (
inputText[i] === "\\" &&
inputText[i + 1] === "0" &&
inputText[i + 2] === "0" &&
inputText[i + 3] === "6" &&
inputText[i + 4] === "\\" &&
inputText[i + 5]?.match(/[0-7]/) &&
inputText[i + 6]?.match(/[0-7]/) &&
inputText[i + 7]?.match(/[0-7]/)
) {
tokens.push({
type: "input",
mask: fromSigned8Bit(parseInt(inputText.substring(i + 5, i + 8), 8)),
});
i += 7;
continue;
}
// Check for wait time
if (
inputText[i] === "!" &&
inputText[i + 1] === "W" &&
inputText[i + 2] === ":"
) {
const timeString = inputText
.substring(i + 3, i + 8)
.replace(/[sf]![\s\S]*/, "");
i += timeString.length + 4;
const units = inputText[i - 1] === "s" ? "time" : "frames";
const time = ensureNumber(parseInt(timeString, 10), 30);
const frames = units === "time" ? time * 60 : time;
tokens.push({
type: "wait",
time,
units,
frames,
});
continue;
}
// Check for newline
Iif (
inputText[i] === "\\" &&
inputText[i + 1] === "0" &&
inputText[i + 2] === "1" &&
inputText[i + 3] === "2"
) {
tokens.push({
type: "text",
value: "\\012",
});
i += 3;
continue;
}
// Check for double % to make sure preview matches in game behaviour
if (inputText[i] === "%" && inputText[i + 1] === "%") {
tokens.push({
type: "text",
value: inputText.substring(i, i + 2),
previewValue: inputText[i],
});
i += 1;
continue;
}
// Ignore unmatched GBVM octal in previews
if (inputText[i] === "\\" && inputText[i + 1]?.match(/[0-7]/)) {
let len = 1;
if (inputText[i + 2]?.match(/[0-7]/)) {
len++;
if (inputText[i + 3]?.match(/[0-7]/)) {
len++;
}
}
const octalCode = parseInt(inputText.substring(i + 1, i + len + 1), 8);
tokens.push({
type: "text",
value: inputText.slice(i, i + len + 1),
previewValue:
octalCode > CONTROL_CODE_END ? String.fromCharCode(octalCode) : "",
});
i += len;
continue;
}
// Add as text token
const lastToken = tokens[tokens.length - 1];
if (lastToken?.type === "text" && lastToken.previewValue === undefined) {
lastToken.value += inputText[i];
} else {
tokens.push({
type: "text",
value: inputText[i],
});
}
}
return tokens;
};
|