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import {Position, VirtualPosition} from "../../position";
import {Token} from "./tokens/_token";
import {IABAPLexerResult} from "./lexer_result";
import {At, AtW, BracketLeft, BracketLeftW, BracketRight, BracketRightW, Comment, Dash, DashW, Identifier, InstanceArrow, InstanceArrowW, ParenLeft, ParenLeftW, ParenRight, ParenRightW, Plus, PlusW, Pragma, Punctuation, StaticArrow, StaticArrowW, StringTemplate, StringTemplateBegin, StringTemplateEnd, StringTemplateMiddle, StringToken, WAt, WAtW, WBracketLeft, WBracketLeftW, WBracketRight, WBracketRightW, WDash, WDashW, WInstanceArrow, WInstanceArrowW, WParenLeft, WParenLeftW, WParenRight, WParenRightW, WPlus, WPlusW, WStaticArrow, WStaticArrowW} from "./tokens";
class Buffer {
private buf: string;
public constructor() {
this.buf = "";
}
public add(s: string): string {
this.buf = this.buf + s;
return this.buf;
}
public get(): string {
return this.buf;
}
public clear(): void {
this.buf = "";
}
public countIsEven(char: string): boolean {
let count = 0;
for (let i = 0; i < this.buf.length; i += 1) {
if (this.buf.charAt(i) === char) {
count += 1;
}
}
return count % 2 === 0;
}
}
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 {
if (this.offset - 1 < 0) {
return "";
}
return this.raw.substr(this.offset - 1, 1);
}
public prevPrevChar(): string {
if (this.offset - 2 < 0) {
return "";
}
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
} else if (this.offset >= this.raw.length) {
return "";
}
return this.raw.substr(this.offset, 1);
}
public nextChar(): string {
if (this.offset + 2 > this.raw.length) {
return "";
}
return this.raw.substr(this.offset + 1, 1);
}
public nextNextChar(): string {
if (this.offset + 3 > this.raw.length) {
return this.nextChar();
}
return this.raw.substr(this.offset + 1, 2);
}
public getRaw(): string {
return this.raw;
}
public getOffset() {
return this.offset;
}
}
export class Lexer {
private readonly ModeNormal: number = 1;
private readonly ModePing: number = 2;
private readonly ModeStr: number = 3;
private readonly ModeTemplate: number = 4;
private readonly ModeComment: number = 5;
private readonly ModePragma: number = 6;
private virtual: Position | undefined;
private tokens: Token[];
private m: number;
private stream: Stream;
private buffer: Buffer;
public run(file: IFile, virtual?: Position): IABAPLexerResult {
this.virtual = virtual;
this.tokens = [];
this.m = this.ModeNormal;
this.process(file.getRaw());
return {file, tokens: this.tokens};
}
private add() {
const s = this.buffer.get().trim();
if (s.length > 0) {
const col = this.stream.getCol();
const row = this.stream.getRow();
let whiteBefore = false;
if (this.stream.getOffset() - s.length >= 0) {
const prev = this.stream.getRaw().substr(this.stream.getOffset() - s.length, 1);
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 === this.ModeComment) {
tok = new Comment(pos, s);
} else if (this.m === this.ModePing || this.m === this.ModeStr) {
tok = new StringToken(pos, s);
} else if (this.m === this.ModeTemplate) {
const first = s.charAt(0);
const last = s.charAt(s.length - 1);
if (first === "|" && last === "|") {
tok = new StringTemplate(pos, s);
} else if (first === "|" && last === "{" && whiteAfter === true) {
tok = new StringTemplateBegin(pos, s);
} else if (first === "}" && last === "|" && whiteBefore === true) {
tok = new StringTemplateEnd(pos, s);
} else if (first === "}" && last === "{" && whiteAfter === true && whiteBefore === true) {
tok = new StringTemplateMiddle(pos, s);
} else {
tok = new Identifier(pos, s);
}
} else if (s.length > 2 && s.substr(0, 2) === "##") {
tok = new Pragma(pos, s);
} else if (s.length === 1) {
if (s === "." || s === ",") {
tok = new Punctuation(pos, s);
} else if (s === "[") {
if (whiteBefore === true && whiteAfter === true) {
tok = new WBracketLeftW(pos, s);
} else if (whiteBefore === true) {
tok = new WBracketLeft(pos, s);
} else if (whiteAfter === true) {
tok = new BracketLeftW(pos, s);
} else {
tok = new BracketLeft(pos, s);
}
} else if (s === "(") {
if (whiteBefore === true && whiteAfter === true) {
tok = new WParenLeftW(pos, s);
} else if (whiteBefore === true) {
tok = new WParenLeft(pos, s);
} else if (whiteAfter === true) {
tok = new ParenLeftW(pos, s);
} else {
tok = new ParenLeft(pos, s);
}
} else if (s === "]") {
if (whiteBefore === true && whiteAfter === true) {
tok = new WBracketRightW(pos, s);
} else if (whiteBefore === true) {
tok = new WBracketRight(pos, s);
} else if (whiteAfter === true) {
tok = new BracketRightW(pos, s);
} else {
tok = new BracketRight(pos, s);
}
} else if (s === ")") {
if (whiteBefore === true && whiteAfter === true) {
tok = new WParenRightW(pos, s);
} else if (whiteBefore === true) {
tok = new WParenRight(pos, s);
} else if (whiteAfter === true) {
tok = new ParenRightW(pos, s);
} else {
tok = new ParenRight(pos, s);
}
} else if (s === "-") {
if (whiteBefore === true && whiteAfter === true) {
tok = new WDashW(pos, s);
} else if (whiteBefore === true) {
tok = new WDash(pos, s);
} else if (whiteAfter === true) {
tok = new DashW(pos, s);
} else {
tok = new Dash(pos, s);
}
} else if (s === "+") {
if (whiteBefore === true && whiteAfter === true) {
tok = new WPlusW(pos, s);
} else if (whiteBefore === true) {
tok = new WPlus(pos, s);
} else if (whiteAfter === true) {
tok = new PlusW(pos, s);
} else {
tok = new Plus(pos, s);
}
} else if (s === "@") {
if (whiteBefore === true && whiteAfter === true) {
tok = new WAtW(pos, s);
} else if (whiteBefore === true) {
tok = new WAt(pos, s);
} else if (whiteAfter === true) {
tok = new AtW(pos, s);
} else {
tok = new At(pos, s);
}
}
} else if (s.length === 2) {
if (s === "->") {
if (whiteBefore === true && whiteAfter === true) {
tok = new WInstanceArrowW(pos, s);
} else if (whiteBefore === true) {
tok = new WInstanceArrow(pos, s);
} else if (whiteAfter === true) {
tok = new InstanceArrowW(pos, s);
} else {
tok = new InstanceArrow(pos, s);
}
} else if (s === "=>") {
if (whiteBefore === true && whiteAfter === true) {
tok = new WStaticArrowW(pos, s);
} else if (whiteBefore === true) {
tok = new WStaticArrow(pos, s);
} else if (whiteAfter === true) {
tok = new StaticArrowW(pos, s);
} else {
tok = new StaticArrow(pos, s);
}
}
}
if (tok === undefined) {
tok = new Identifier(pos, s);
}
this.tokens.push(tok);
}
this.buffer.clear();
}
private process(raw: string) {
this.stream = new Stream(raw.replace(/\r/g, ""));
this.buffer = new Buffer();
const splits: {[name: string]: boolean} = {};
splits[" "] = true;
splits[":"] = true;
splits["."] = true;
splits[","] = true;
splits["-"] = true;
splits["+"] = true;
splits["("] = true;
splits[")"] = true;
splits["["] = true;
splits["]"] = true;
splits["\t"] = true;
splits["\n"] = true;
const bufs: {[name: string]: boolean} = {};
bufs["."] = true;
bufs[","] = true;
bufs[":"] = true;
bufs["("] = true;
bufs[")"] = true;
bufs["["] = true;
bufs["]"] = true;
bufs["+"] = true;
bufs["@"] = true;
for (;;) {
const current = this.stream.currentChar();
const buf = this.buffer.add(current);
const ahead = this.stream.nextChar();
const aahead = this.stream.nextNextChar();
if (this.m === this.ModeNormal) {
if (splits[ahead]) {
this.add();
} else if (ahead === "'") {
// start string
this.add();
this.m = this.ModeStr;
} else if (ahead === "|" || ahead === "}") {
// start template
this.add();
this.m = this.ModeTemplate;
} else if (ahead === "`") {
// start ping
this.add();
this.m = this.ModePing;
} else if (aahead === "##") {
// start pragma
this.add();
this.m = this.ModePragma;
} else if (ahead === "\""
|| (ahead === "*" && current === "\n")) {
// start comment
this.add();
this.m = this.ModeComment;
} else if (ahead === "@" && buf.trim().length === 0) {
this.add();
} else if (aahead === "->"
|| aahead === "=>") {
this.add();
} else if (current === ">"
&& ahead !== " "
&& (this.stream.prevChar() === "-" || this.stream.prevChar() === "=")) {
// arrows
this.add();
} else if (buf.length === 1
&& (bufs[buf]
|| (buf === "-" && ahead !== ">"))) {
this.add();
}
} else if (this.m === this.ModePragma && (ahead === "," || ahead === ":" || ahead === "." || ahead === " " || ahead === "\n")) {
// end of pragma
this.add();
this.m = this.ModeNormal;
} else if (this.m === this.ModePing
&& buf.length > 1
&& current === "`"
&& aahead !== "``"
&& ahead !== "`"
&& this.buffer.countIsEven("`")) {
// end of ping
this.add();
if (ahead === `"`) {
this.m = this.ModeComment;
} else {
this.m = this.ModeNormal;
}
} else if (this.m === this.ModeTemplate
&& buf.length > 1
&& (current === "|" || current === "{")
&& (this.stream.prevChar() !== "\\" || this.stream.prevPrevChar() === "\\\\")) {
// end of template
this.add();
this.m = this.ModeNormal;
} else if (this.m === this.ModeStr
&& current === "'"
&& buf.length > 1
&& aahead !== "''"
&& ahead !== "'"
&& this.buffer.countIsEven("'")) {
// end of string
this.add();
if (ahead === "\"") {
this.m = this.ModeComment;
} else {
this.m = this.ModeNormal;
}
} else if (ahead === "\n" && this.m !== this.ModeTemplate) {
this.add();
this.m = this.ModeNormal;
} else if (this.m === this.ModeTemplate && current === "\n") {
this.add();
}
if (!this.stream.advance()) {
break;
}
}
this.add();
}
} |