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import {Position} from "../../position"; import {VirtualPosition} from "../../virtual_position"; import {AbstractToken} from "./tokens/abstract_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"; import {LexerBuffer} from "./lexer_buffer"; import {LexerStream} from "./lexer_stream"; 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: AbstractToken[]; private m: number; private stream: LexerStream; private buffer: LexerBuffer; 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: AbstractToken | 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 LexerStream(raw.replace(/\r/g, "")); this.buffer = new LexerBuffer(); 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.ModeTemplate && ahead === "}" && current !== "\\") { this.add(); } 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(); } } |