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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, AssociationName, 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";
const ModeNormal: number = 1;
const ModePing: number = 2;
const ModeStr: number = 3;
const ModeTemplate: number = 4;
const ModeComment: number = 5;
const ModePragma: number = 6;
// character codes, used for integer comparisons in the hot loop
const EOF = -1; // no character (start/end of file)
const CH_TAB = 9; // "\t"
const CH_NL = 10; // "\n"
const CH_SPACE = 32; // " "
const CH_DQUOTE = 34; // "\""
const CH_HASH = 35; // "#"
const CH_QUOTE = 39; // "'"
const CH_STAR = 42; // "*"
const CH_DASH = 45; // "-"
const CH_COMMA = 44; // ","
const CH_DOT = 46; // "."
const CH_COLON = 58; // ":"
const CH_EQUALS = 61; // "="
const CH_GT = 62; // ">"
const CH_AT = 64; // "@"
const CH_BACKSLASH = 92; // "\\"
const CH_BACKTICK = 96; // "`"
const CH_LBRACE = 123; // "{"
const CH_PIPE = 124; // "|"
const CH_RBRACE = 125; // "}"
// characters that terminate the current token
const SPLITS = new Set<number>([
CH_SPACE, CH_COLON, CH_DOT, CH_COMMA, CH_DASH, 43 /* + */, 40 /* ( */,
41 /* ) */, 91 /* [ */, 93 /* ] */, CH_BACKSLASH, CH_TAB, CH_NL]);
// single characters that are emitted as their own token
const BUFS = new Set<number>([
CH_DOT, CH_COMMA, CH_COLON, 40 /* ( */, 41 /* ) */, 91 /* [ */,
93 /* ] */, 43 /* + */, CH_AT]);
// characters treated as separators after ping literals and string templates.
// Single-quoted text literals always end at their closing quote.
const AFTER_LITERAL = new Set<number>([
EOF, CH_SPACE, CH_TAB, CH_NL, CH_DOT, CH_COMMA, CH_COLON, CH_DQUOTE,
40 /* ( */, 41 /* ) */, 91 /* [ */, 93 /* ] */]);
export class Lexer {
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 = 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;
const beforeOffset = this.stream.getOffset() - s.length;
if (beforeOffset >= 0) {
const prev = this.stream.charCodeAt(beforeOffset);
if (prev === CH_SPACE || prev === CH_NL || prev === CH_TAB || prev === CH_COLON) {
whiteBefore = true;
}
}
let whiteAfter = false;
const next = this.stream.nextChar();
if (next === CH_SPACE || next === CH_NL || next === CH_TAB || next === CH_COLON
|| next === CH_COMMA || next === CH_DOT || next === EOF || next === CH_DQUOTE) {
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 === ModeComment) {
tok = new Comment(pos, s);
} else if (this.m === ModePing || this.m === ModeStr) {
tok = new StringToken(pos, s);
} else if (this.m === 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 && this.m === ModeNormal && s.charAt(0) === "\\") {
const adj = this.stream.nextChar() === EOF ? 1 : 0;
const prevOffset = this.stream.getOffset() - s.length - adj;
const prevChar = this.stream.charCodeAt(prevOffset);
const whiteBeforeBackslash = prevChar === CH_SPACE || prevChar === CH_NL || prevChar === CH_TAB || prevChar === CH_COLON;
if (!whiteBeforeBackslash) {
tok = new AssociationName(pos, s);
}
}
if (tok === undefined) {
tok = new Identifier(pos, s);
}
this.tokens.push(tok);
}
this.buffer.clear();
}
private process(raw: string) {
const stream = new LexerStream(raw.replace(/\r/g, ""));
this.stream = stream;
this.buffer = new LexerBuffer(stream.getRaw());
for (;;) {
const current = stream.currentChar();
this.buffer.add(stream.getOffset());
const ahead = stream.nextChar();
const aahead = stream.nextNextChar();
if (this.m === ModeNormal) {
if (SPLITS.has(ahead)) {
this.add();
} else if (ahead === CH_QUOTE) {
// start string
this.add();
this.m = ModeStr;
} else if (ahead === CH_PIPE || ahead === CH_RBRACE) {
// start template
this.add();
this.m = ModeTemplate;
} else if (ahead === CH_BACKTICK) {
// start ping
this.add();
this.m = ModePing;
} else if (ahead === CH_HASH && aahead === CH_HASH) {
// start pragma
this.add();
this.m = ModePragma;
} else if (ahead === CH_DQUOTE
|| (ahead === CH_STAR && current === CH_NL)) {
// start comment
this.add();
this.m = ModeComment;
} else if (ahead === CH_AT && this.buffer.get().trim().length === 0) {
this.add();
} else if ((ahead === CH_DASH || ahead === CH_EQUALS) && aahead === CH_GT) {
this.add();
} else if (current === CH_GT
&& ahead !== CH_SPACE
&& (stream.prevChar() === CH_DASH || stream.prevChar() === CH_EQUALS)) {
// arrows
this.add();
} else if (this.buffer.length() === 1
&& (BUFS.has(current)
|| (current === CH_DASH && ahead !== CH_GT))) {
this.add();
}
} else if (this.m === ModePragma && (ahead === CH_COMMA || ahead === CH_COLON
|| ahead === CH_DOT || ahead === CH_SPACE || ahead === CH_NL)) {
// end of pragma
this.add();
this.m = ModeNormal;
} else if (this.m === ModePing
&& this.buffer.length() > 1
&& current === CH_BACKTICK
&& !(ahead === CH_BACKTICK && aahead === CH_BACKTICK)
&& ahead !== CH_BACKTICK
&& this.buffer.countIsEven(CH_BACKTICK)) {
// end of ping
if (AFTER_LITERAL.has(ahead)) {
this.add();
}
// else: no separator after the literal, keep the buffer so the following
// characters are glued onto the token, the parser will report the error
if (ahead === CH_DQUOTE) {
this.m = ModeComment;
} else {
this.m = ModeNormal;
}
} else if (this.m === ModeTemplate
&& this.buffer.length() > 1
&& (current === CH_PIPE || current === CH_LBRACE)
&& stream.countPrevious(CH_BACKSLASH) % 2 === 0) {
// end of template
if (current === CH_LBRACE || AFTER_LITERAL.has(ahead)) {
this.add();
}
this.m = ModeNormal;
} else if (this.m === ModeTemplate
&& ahead === CH_RBRACE
&& current !== CH_BACKSLASH) {
this.add();
} else if (this.m === ModeStr
&& current === CH_QUOTE
&& this.buffer.length() > 1
&& !(ahead === CH_QUOTE && aahead === CH_QUOTE)
&& ahead !== CH_QUOTE
&& this.buffer.countIsEven(CH_QUOTE)) {
// end of string
this.add();
if (ahead === CH_DQUOTE) {
this.m = ModeComment;
} else {
this.m = ModeNormal;
}
} else if (ahead === CH_NL && this.m !== ModeTemplate) {
this.add();
this.m = ModeNormal;
} else if (this.m === ModeTemplate && current === CH_NL) {
this.add();
}
if (!stream.advance()) {
break;
}
}
this.add();
}
}
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