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import {AbstractToken} from "../abap/1_lexer/tokens/abstract_token";
import {IFile} from "../files/_ifile";
import {Position} from "../position";
// todo: Keywords must be all uppercase, all lowercase, or in lowercase with an
// uppercase initial letter. Other mixes of uppercase and lowercase are not allowed
class Stream {
private buffer: string;
public constructor(buffer: string) {
this.buffer = buffer;
}
public takeNext(): string {
const next = this.buffer.substring(0, 1);
this.buffer = this.buffer.substring(1);
return next;
}
public peekNext(): string {
const next = this.buffer.substring(0, 1);
return next;
}
public length(): number {
return this.buffer.length;
}
}
enum Mode {
Default,
String,
DoubleQuoteString,
SingleLineComment,
MultiLineComment,
}
class Result {
private readonly result: AbstractToken[] = [];
public add(text: string, row: number, col: number, mode: Mode): string {
if (text.length > 0) {
if (mode === Mode.SingleLineComment
&& (text.startsWith("--") || text.startsWith("//"))) {
this.result.push(new Comment(new Position(row, col - text.length), text));
} else {
this.result.push(new Identifier(new Position(row, col), text));
}
}
return "";
}
public get() {
return this.result;
}
}
export class CDSLexer {
public static run(file: IFile): AbstractToken[] {
const result = new Result();
let mode = Mode.Default;
let row = 1;
let col = 1;
let build = "";
const stream = new Stream(file.getRaw().replace(/\r/g, "").replace(/\u00a0/g, " ").replace(/\u000b/g, " "));
let next = "";
while (stream.length() > 0) {
const prev = next;
next = stream.takeNext();
const nextNext = stream.peekNext();
col++;
// string handling
if (mode === Mode.String) {
build += next;
if (next === "'" && nextNext === "'") {
// escaped single quote (doubled), continue string
build += stream.takeNext();
col++;
} else if (next === "\\" && nextNext === "\\") {
// escaped backslash (e.g. '\\' in ltrim/rtrim calls), consume both chars
build += stream.takeNext();
col++;
} else if (next === "\\" && nextNext === "'") {
// backslash-escaped single quote, continue string
build += stream.takeNext();
col++;
} else if (next === "'") {
build = result.add(build, row, col, mode);
mode = Mode.Default;
}
continue;
}
// double-quote string handling
if (mode === Mode.DoubleQuoteString) {
build += next;
if (next === "\\" && nextNext === "\"") {
build += stream.takeNext();
col++;
} else if (next === "\"" && nextNext === "\"") {
build += stream.takeNext();
col++;
} else if (next === "\"") {
build = result.add(build, row, col, mode);
mode = Mode.Default;
}
continue;
}
// single line comment handling
if (mode === Mode.SingleLineComment) {
if (next === "\n") {
build = result.add(build, row, col, mode);
mode = Mode.Default;
} else {
build += next;
continue;
}
} else if (mode === Mode.Default && next === "/" && nextNext === "/") {
mode = Mode.SingleLineComment;
build = result.add(build, row, col, mode);
build += next;
continue;
} else if (mode === Mode.Default && next === "-" && nextNext === "-") {
mode = Mode.SingleLineComment;
build = result.add(build, row, col, mode);
build += next;
continue;
}
// multi line comment handling
if (mode === Mode.MultiLineComment) {
if (next === "\n") {
row++;
} else if (prev === "*" && next === "/") {
mode = Mode.Default;
}
continue;
} else if (mode === Mode.Default && next === "/" && nextNext === "*") {
mode = Mode.MultiLineComment;
build = result.add(build, row, col, mode);
stream.takeNext(); // consume the '*' so it doesn't become prev for '*/' detection
col++;
continue;
}
switch (next) {
case "'":
build = result.add(build, row, col, mode);
mode = Mode.String;
build += next;
break;
case "\"":
build = result.add(build, row, col, mode);
mode = Mode.DoubleQuoteString;
build += next;
break;
case " ":
case "\t":
build = result.add(build, row, col, mode);
break;
case "\n":
build = result.add(build, row, col, mode);
row++;
col = 0;
break;
case ";":
case ":":
case ",":
case ".":
case "{":
case "}":
case "(":
case ")":
case "[":
case "]":
case "!":
case "=":
case "<":
case ">":
case "+":
case "-":
case "*":
case "/":
build = result.add(build, row, col, mode);
result.add(next, row, col, mode);
break;
case "@":
// @ starts a new annotation; flush current token and start building with @
result.add(build, row, col, mode);
build = "@";
break;
default:
build += next;
break;
}
}
result.add(build, row, col, mode);
return result.get();
}
}
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