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import {IFile} from "../../files/_ifile";
import {Position, VirtualPosition} from "../../position";
import {Token} from "./tokens/_token";
import {ILexerResult} from "./lexer_result";
enum Mode {
Normal,
Ping,
Str,
Template,
Comment,
Pragma,
}
class Buffer {
private buf: string;
public constructor() {
this.buf = "";
}
public add(s: string): void {
this.buf = this.buf + s;
}
public get(): string {
return this.buf;
}
public clear(): void {
this.buf = "";
}
}
class Stream {
private readonly raw: string;
private offset = -1;
private row: number;
private col: number;
public constructor(raw: string) {
this.raw = raw;
this.row = 0;
this.col = 0;
}
public advance(): boolean {
if (this.currentChar() === "\n") {
this.col = 1;
this.row = this.row + 1;
}
if (this.offset === this.raw.length) {
return false;
}
this.col = this.col + 1;
this.offset = this.offset + 1;
return true;
}
public getCol(): number {
return this.col;
}
public getRow(): number {
return this.row;
}
public prevChar(): string {
return this.raw.substr(this.offset - 1, 1);
}
public prevPrevChar(): string {
return this.raw.substr(this.offset - 2, 2);
}
public currentChar(): string {
if (this.offset < 0) {
return "\n"; // simulate newline at start of file to handle star(*) comments
}
return this.raw.substr(this.offset, 1);
}
public nextChar(): string {
return this.raw.substr(this.offset + 1, 1);
}
public nextNextChar(): string {
return this.raw.substr(this.offset + 1, 2);
}
}
export class Lexer {
private static virtual: Position | undefined;
private static tokens: Token[];
private static m: Mode;
private static stream: Stream;
private static buffer: Buffer;
public static run(file: IFile, virtual?: Position): ILexerResult {
this.virtual = virtual;
this.tokens = [];
this.m = Mode.Normal;
this.process(file.getRaw());
return {file, tokens: this.tokens};
}
private static add() {
const s = this.buffer.get().trim();
if (s.length > 0) {
const col = this.stream.getCol();
const row = this.stream.getRow();
let whiteBefore = false;
const prev = this.stream.prevChar();
if (prev === " " || prev === "\n" || prev === "\t" || prev === ":") {
whiteBefore = true;
}
let whiteAfter = false;
const next = this.stream.nextChar();
if (next === " " || next === "\n" || next === "\t" || next === ":" || next === "," || next === "." || next === "" || next === "\"") {
whiteAfter = true;
}
let pos = new Position(row, col - s.length);
if (this.virtual) {
pos = new VirtualPosition(this.virtual, pos.getRow(), pos.getCol());
}
let tok: Token | undefined = undefined;
if (this.m === Mode.Comment) {
tok = new Tokens.Comment(pos, s);
} else if (this.m === Mode.Ping || this.m === Mode.Str) {
tok = new Tokens.String(pos, s);
} else if (this.m === Mode.Template) {
const first = s.charAt(0);
const last = s.charAt(s.length - 1);
if (first === "|" && last === "|") {
tok = new Tokens.StringTemplate(pos, s);
} else if (first === "|" && last === "{") {
tok = new Tokens.StringTemplateBegin(pos, s);
} else if (first === "}" && last === "|") {
tok = new Tokens.StringTemplateEnd(pos, s);
} else Eif (first === "}" && last === "{") {
tok = new Tokens.StringTemplateMiddle(pos, s);
} else {
tok = new Tokens.Identifier(pos, s);
}
} else if (s.substr(0, 2) === "##") {
tok = new Tokens.Pragma(pos, s);
} else if (s.length === 1) {
if (s === "." || s === ",") {
tok = new Tokens.Punctuation(pos, s);
} else if (s === "[") {
Iif (whiteBefore && whiteAfter) {
tok = new Tokens.WBracketLeftW(pos, s);
} else Iif (whiteBefore) {
tok = new Tokens.WBracketLeft(pos, s);
} else if (whiteAfter) {
tok = new Tokens.BracketLeftW(pos, s);
} else {
tok = new Tokens.BracketLeft(pos, s);
}
} else if (s === "(") {
if (whiteBefore && whiteAfter) {
tok = new Tokens.WParenLeftW(pos, s);
} else if (whiteBefore) {
tok = new Tokens.WParenLeft(pos, s);
} else if (whiteAfter) {
tok = new Tokens.ParenLeftW(pos, s);
} else {
tok = new Tokens.ParenLeft(pos, s);
}
} else if (s === "]") {
if (whiteBefore && whiteAfter) {
tok = new Tokens.WBracketRightW(pos, s);
} else if (whiteBefore) {
tok = new Tokens.WBracketRight(pos, s);
} else Eif (whiteAfter) {
tok = new Tokens.BracketRightW(pos, s);
} else {
tok = new Tokens.BracketRight(pos, s);
}
} else if (s === ")") {
if (whiteBefore && whiteAfter) {
tok = new Tokens.WParenRightW(pos, s);
} else if (whiteBefore) {
tok = new Tokens.WParenRight(pos, s);
} else if (whiteAfter) {
tok = new Tokens.ParenRightW(pos, s);
} else {
tok = new Tokens.ParenRight(pos, s);
}
} else if (s === "-") {
if (whiteBefore && whiteAfter) {
tok = new Tokens.WDashW(pos, s);
} else if (whiteBefore) {
tok = new Tokens.WDash(pos, s);
} else if (whiteAfter) {
tok = new Tokens.DashW(pos, s);
} else {
tok = new Tokens.Dash(pos, s);
}
} else if (s === "+") {
if (whiteBefore && whiteAfter) {
tok = new Tokens.WPlusW(pos, s);
} else if (whiteBefore) {
tok = new Tokens.WPlus(pos, s);
} else if (whiteAfter) {
tok = new Tokens.PlusW(pos, s);
} else {
tok = new Tokens.Plus(pos, s);
}
} else if (s === "@") {
Iif (whiteBefore && whiteAfter) {
tok = new Tokens.WAtW(pos, s);
} else if (whiteBefore) {
tok = new Tokens.WAt(pos, s);
} else Iif (whiteAfter) {
tok = new Tokens.AtW(pos, s);
} else {
tok = new Tokens.At(pos, s);
}
}
} else if (s.length === 2) {
if (s === "->") {
Iif (whiteBefore && whiteAfter) {
tok = new Tokens.WInstanceArrowW(pos, s);
} else Iif (whiteBefore) {
tok = new Tokens.WInstanceArrow(pos, s);
} else Iif (whiteAfter) {
tok = new Tokens.InstanceArrowW(pos, s);
} else {
tok = new Tokens.InstanceArrow(pos, s);
}
} else if (s === "=>") {
Iif (whiteBefore && whiteAfter) {
tok = new Tokens.WStaticArrowW(pos, s);
} else Iif (whiteBefore) {
tok = new Tokens.WStaticArrow(pos, s);
} else if (whiteAfter) {
tok = new Tokens.StaticArrowW(pos, s);
} else {
tok = new Tokens.StaticArrow(pos, s);
}
}
}
if (tok === undefined) {
tok = new Tokens.Identifier(pos, s);
}
this.tokens.push(tok);
}
this.buffer.clear();
}
private static process(raw: string) {
this.stream = new Stream(raw.replace(/\r/g, ""));
this.buffer = new Buffer();
for (;;) {
const current = this.stream.currentChar();
this.buffer.add(current);
const buf = this.buffer.get();
const ahead = this.stream.nextChar();
const aahead = this.stream.nextNextChar();
const prev = this.stream.prevChar();
if (ahead === "'" && this.m === Mode.Normal) {
// start string
this.add();
this.m = Mode.Str;
} else if ((ahead === "|" || ahead === "}")
&& this.m === Mode.Normal) {
// start template
this.add();
this.m = Mode.Template;
} else if (ahead === "`" && this.m === Mode.Normal) {
// start ping
this.add();
this.m = Mode.Ping;
} else if (aahead === "##" && this.m === Mode.Normal) {
// start pragma
this.add();
this.m = Mode.Pragma;
} else if ((ahead === "\"" || (ahead === "*" && current === "\n"))
&& this.m === Mode.Normal) {
// start comment
this.add();
this.m = Mode.Comment;
} else if (this.m === Mode.Pragma && (ahead === "," || ahead === ":" || ahead === "." || ahead === " " || ahead === "\n")) {
// end of pragma
this.add();
this.m = Mode.Normal;
} else if (this.m === Mode.Ping
&& buf.length > 1
&& current === "`"
&& aahead !== "``"
&& (buf.match(/`/g) || []).length % 2 === 0
&& ahead !== "`") {
// end of ping
this.add();
this.m = Mode.Normal;
} else if (this.m === Mode.Template
&& buf.length > 1
&& (current === "|" || current === "{")
&& (prev !== "\\" || this.stream.prevPrevChar() === "\\\\")) {
// end of template
this.add();
this.m = Mode.Normal;
} else if (this.m === Mode.Str
&& current === "'"
&& buf.length > 1
&& aahead !== "''"
&& (buf.match(/'/g) || []).length % 2 === 0
&& ahead !== "'") {
// end of string
this.add();
if (ahead === "\"") {
this.m = Mode.Comment;
} else {
this.m = Mode.Normal;
}
} else if (this.m === Mode.Normal
&& (ahead === " "
|| ahead === ":"
|| ahead === "."
|| ahead === ","
|| ahead === "-"
|| ahead === "+"
|| ahead === "("
|| ahead === ")"
|| ahead === "["
|| ahead === "]"
|| (ahead === "@" && buf.trim().length === 0)
|| aahead === "->"
|| aahead === "=>"
|| ahead === "\t"
|| ahead === "\n")) {
this.add();
} else if (ahead === "\n" && this.m !== Mode.Template) {
this.add();
this.m = Mode.Normal;
} else Iif (this.m === Mode.Template && current === "\n") {
this.add();
} else if (current === ">"
&& (prev === "-" || prev === "=")
&& ahead !== " "
&& this.m === Mode.Normal) {
// arrows
this.add();
} else if (this.m === Mode.Normal
&& (buf === "."
|| buf === ","
|| buf === ":"
|| buf === "("
|| buf === ")"
|| buf === "["
|| buf === "]"
|| buf === "+"
|| buf === "@"
|| (buf === "-" && ahead !== ">"))) {
this.add();
}
if (!this.stream.advance()) {
break;
}
}
this.add();
}
} |