mirror of
https://github.com/golang/go
synced 2024-11-12 09:20:22 -07:00
778 lines
13 KiB
Go
778 lines
13 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package Scanner
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export
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ILLEGAL, EOF, IDENT, STRING, NUMBER,
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COMMA, COLON, SEMICOLON, PERIOD,
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LPAREN, RPAREN, LBRACK, RBRACK, LBRACE, RBRACE,
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ASSIGN, DEFINE,
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INC, DEC, NOT,
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AND, OR, XOR,
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ADD, SUB, MUL, QUO, REM,
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EQL, NEQ, LSS, LEQ, GTR, GEQ,
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SHL, SHR,
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ADD_ASSIGN, SUB_ASSIGN, MUL_ASSIGN, QUO_ASSIGN, REM_ASSIGN,
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AND_ASSIGN, OR_ASSIGN, XOR_ASSIGN, SHL_ASSIGN, SHR_ASSIGN,
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LAND, LOR,
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BREAK, CASE, CHAN, CONST, CONTINUE, DEFAULT, ELSE, EXPORT, FALLTHROUGH, FALSE,
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FOR, FUNC, GO, GOTO, IF, IMPORT, INTERFACE, IOTA, MAP, NEW, NIL, PACKAGE, RANGE,
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RETURN, SELECT, STRUCT, SWITCH, TRUE, TYPE, VAR
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const (
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ILLEGAL = iota;
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EOF;
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IDENT;
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STRING;
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NUMBER;
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COMMA;
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COLON;
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SEMICOLON;
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PERIOD;
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LPAREN;
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RPAREN;
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LBRACK;
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RBRACK;
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LBRACE;
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RBRACE;
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ASSIGN;
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DEFINE;
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INC;
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DEC;
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NOT;
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AND;
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OR;
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XOR;
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ADD;
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SUB;
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MUL;
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QUO;
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REM;
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EQL;
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NEQ;
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LSS;
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LEQ;
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GTR;
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GEQ;
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SHL;
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SHR;
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ADD_ASSIGN;
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SUB_ASSIGN;
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MUL_ASSIGN;
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QUO_ASSIGN;
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REM_ASSIGN;
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AND_ASSIGN;
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OR_ASSIGN;
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XOR_ASSIGN;
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SHL_ASSIGN;
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SHR_ASSIGN;
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LAND;
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LOR;
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// keywords
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KEYWORDS_BEG;
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BREAK;
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CASE;
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CHAN;
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CONST;
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CONTINUE;
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DEFAULT;
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ELSE;
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EXPORT;
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FALLTHROUGH;
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FALSE;
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FOR;
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FUNC;
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GO;
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GOTO;
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IF;
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IMPORT;
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INTERFACE;
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IOTA;
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MAP;
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NEW;
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NIL;
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PACKAGE;
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RANGE;
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RETURN;
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SELECT;
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STRUCT;
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SWITCH;
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TRUE;
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TYPE;
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VAR;
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KEYWORDS_END;
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)
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var Keywords *map [string] int;
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export TokenName
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func TokenName(tok int) string {
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switch (tok) {
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case ILLEGAL: return "illegal";
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case EOF: return "eof";
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case IDENT: return "ident";
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case STRING: return "string";
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case NUMBER: return "number";
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case COMMA: return ",";
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case COLON: return ":";
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case SEMICOLON: return ";";
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case PERIOD: return ".";
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case LPAREN: return "(";
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case RPAREN: return ")";
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case LBRACK: return "[";
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case RBRACK: return "]";
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case LBRACE: return "LBRACE";
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case RBRACE: return "RBRACE";
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case ASSIGN: return "=";
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case DEFINE: return ":=";
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case INC: return "++";
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case DEC: return "--";
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case NOT: return "!";
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case AND: return "&";
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case OR: return "|";
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case XOR: return "^";
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case ADD: return "+";
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case SUB: return "-";
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case MUL: return "*";
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case QUO: return "/";
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case REM: return "%";
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case EQL: return "==";
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case NEQ: return "!=";
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case LSS: return "<";
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case LEQ: return "<=";
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case GTR: return ">";
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case GEQ: return ">=";
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case SHL: return "<<";
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case SHR: return ">>";
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case ADD_ASSIGN: return "+=";
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case SUB_ASSIGN: return "-=";
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case MUL_ASSIGN: return "+=";
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case QUO_ASSIGN: return "/=";
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case REM_ASSIGN: return "%=";
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case AND_ASSIGN: return "&=";
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case OR_ASSIGN: return "|=";
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case XOR_ASSIGN: return "^=";
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case SHL_ASSIGN: return "<<=";
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case SHR_ASSIGN: return ">>=";
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case LAND: return "&&";
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case LOR: return "||";
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case BREAK: return "break";
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case CASE: return "case";
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case CHAN: return "chan";
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case CONST: return "const";
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case CONTINUE: return "continue";
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case DEFAULT: return "default";
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case ELSE: return "else";
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case EXPORT: return "export";
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case FALLTHROUGH: return "fallthrough";
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case FALSE: return "false";
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case FOR: return "for";
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case FUNC: return "func";
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case GO: return "go";
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case GOTO: return "goto";
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case IF: return "if";
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case IMPORT: return "import";
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case INTERFACE: return "interface";
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case IOTA: return "iota";
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case MAP: return "map";
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case NEW: return "new";
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case NIL: return "nil";
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case PACKAGE: return "package";
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case RANGE: return "range";
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case RETURN: return "return";
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case SELECT: return "select";
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case STRUCT: return "struct";
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case SWITCH: return "switch";
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case TRUE: return "true";
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case TYPE: return "type";
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case VAR: return "var";
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}
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return "???";
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}
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func is_whitespace (ch int) bool {
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return ch == ' ' || ch == '\r' || ch == '\n' || ch == '\t';
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}
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func is_letter (ch int) bool {
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return 'a' <= ch && ch <= 'z' || 'A' <= ch && ch <= 'Z' || ch == '_' || ch >= 128 ;
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}
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func digit_val (ch int) int {
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if '0' <= ch && ch <= '9' {
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return ch - '0';
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}
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if 'a' <= ch && ch <= 'f' {
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return ch - 'a' + 10;
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}
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if 'A' <= ch && ch <= 'F' {
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return ch - 'A' + 10;
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}
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return 16; // larger than any legal digit val
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}
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export Scanner
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type Scanner struct {
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filename string; // error reporting only
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nerrors int; // number of errors
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errpos int; // last error position
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src string;
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pos int; // current reading position
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ch int; // one char look-ahead
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chpos int; // position of ch
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}
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// Read the next Unicode char into S.ch.
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// S.ch < 0 means end-of-file.
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//
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func (S *Scanner) Next () {
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const (
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Bit1 = 7;
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Bitx = 6;
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Bit2 = 5;
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Bit3 = 4;
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Bit4 = 3;
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// TODO 6g constant evaluation incomplete
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T1 = 0x00; // (1 << (Bit1 + 1) - 1) ^ 0xFF; // 0000 0000
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Tx = 0x80; // (1 << (Bitx + 1) - 1) ^ 0xFF; // 1000 0000
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T2 = 0xC0; // (1 << (Bit2 + 1) - 1) ^ 0xFF; // 1100 0000
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T3 = 0xE0; // (1 << (Bit3 + 1) - 1) ^ 0xFF; // 1110 0000
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T4 = 0xF0; // (1 << (Bit4 + 1) - 1) ^ 0xFF; // 1111 0000
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Rune1 = 1 << (Bit1 + 0*Bitx) - 1; // 0000 0000 0111 1111
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Rune2 = 1 << (Bit2 + 1*Bitx) - 1; // 0000 0111 1111 1111
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Rune3 = 1 << (Bit3 + 2*Bitx) - 1; // 1111 1111 1111 1111
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Maskx = 0x3F; // 1 << Bitx - 1; // 0011 1111
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Testx = 0xC0; // Maskx ^ 0xFF; // 1100 0000
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Bad = 0xFFFD; // Runeerror
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);
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src := S.src; // TODO only needed because of 6g bug
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lim := len(src);
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pos := S.pos;
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// 1-byte sequence
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// 0000-007F => T1
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if pos >= lim {
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S.ch = -1; // end of file
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S.chpos = lim;
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return;
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}
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c0 := int(src[pos]);
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pos++;
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if c0 < Tx {
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S.ch = c0;
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S.chpos = S.pos;
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S.pos = pos;
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return;
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}
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// 2-byte sequence
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// 0080-07FF => T2 Tx
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if pos >= lim {
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goto bad;
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}
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c1 := int(src[pos]) ^ Tx;
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pos++;
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if c1 & Testx != 0 {
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goto bad;
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}
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if c0 < T3 {
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if c0 < T2 {
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goto bad;
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}
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r := (c0 << Bitx | c1) & Rune2;
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if r <= Rune1 {
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goto bad;
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}
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S.ch = r;
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S.chpos = S.pos;
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S.pos = pos;
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return;
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}
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// 3-byte sequence
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// 0800-FFFF => T3 Tx Tx
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if pos >= lim {
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goto bad;
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}
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c2 := int(src[pos]) ^ Tx;
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pos++;
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if c2 & Testx != 0 {
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goto bad;
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}
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if c0 < T4 {
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r := (((c0 << Bitx | c1) << Bitx) | c2) & Rune3;
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if r <= Rune2 {
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goto bad;
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}
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S.ch = r;
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S.chpos = S.pos;
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S.pos = pos;
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return;
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}
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// bad encoding
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bad:
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S.ch = Bad;
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S.chpos = S.pos;
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S.pos += 1;
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return;
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}
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func Init () {
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Keywords = new(map [string] int);
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for i := KEYWORDS_BEG; i <= KEYWORDS_END; i++ {
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Keywords[TokenName(i)] = i;
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}
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}
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// Compute (line, column) information for a given source position.
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func (S *Scanner) LineCol(pos int) (line, col int) {
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line = 1;
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lpos := 0;
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src := S.src;
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if pos > len(src) {
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pos = len(src);
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}
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for i := 0; i < pos; i++ {
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if src[i] == '\n' {
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line++;
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lpos = i;
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}
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}
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return line, pos - lpos;
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}
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func (S *Scanner) Error(pos int, msg string) {
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const errdist = 10;
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if pos > S.errpos + errdist || S.nerrors == 0 {
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line, col := S.LineCol(pos);
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print S.filename, ":", line, ":", col, ": ", msg, "\n";
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S.nerrors++;
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S.errpos = pos;
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}
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}
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func (S *Scanner) Open (filename, src string) {
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if Keywords == nil {
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Init();
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}
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S.filename = filename;
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S.nerrors = 0;
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S.errpos = 0;
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S.src = src;
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S.pos = 0;
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S.Next();
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}
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// TODO this needs to go elsewhere
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func IntString(x, base int) string {
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neg := false;
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if x < 0 {
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x = -x;
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if x < 0 {
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panic "smallest int not handled";
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}
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neg = true;
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}
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hex := "0123456789ABCDEF";
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var buf [16] byte;
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i := 0;
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for x > 0 || i == 0 {
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buf[i] = hex[x % base];
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x /= base;
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i++;
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}
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s := "";
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if neg {
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s = "-";
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}
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for i > 0 {
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i--;
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s = s + string(int(buf[i]));
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}
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return s;
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}
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func CharString(ch int) string {
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s := string(ch);
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switch ch {
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case '\a': s = `\a`;
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case '\b': s = `\b`;
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case '\f': s = `\f`;
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case '\n': s = `\n`;
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case '\r': s = `\r`;
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case '\t': s = `\t`;
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case '\v': s = `\v`;
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case '\\': s = `\\`;
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case '\'': s = `\'`;
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}
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return "'" + s + "' (U+" + IntString(ch, 16) + ")";
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}
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func (S *Scanner) Expect (ch int) {
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if S.ch != ch {
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S.Error(S.chpos, "expected " + CharString(ch) + ", found " + CharString(S.ch));
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}
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S.Next(); // make always progress
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}
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func (S *Scanner) SkipWhitespace () {
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for is_whitespace(S.ch) {
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S.Next();
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}
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}
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func (S *Scanner) SkipComment () {
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// '/' already consumed
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if S.ch == '/' {
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// comment
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S.Next();
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for S.ch != '\n' && S.ch >= 0 {
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S.Next();
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}
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} else {
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/* comment */
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pos := S.chpos - 1;
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S.Expect('*');
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for S.ch >= 0 {
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ch := S.ch;
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S.Next();
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if ch == '*' && S.ch == '/' {
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S.Next();
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return;
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}
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}
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S.Error(pos, "comment not terminated");
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}
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}
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func (S *Scanner) ScanIdentifier () int {
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beg := S.pos - 1;
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for is_letter(S.ch) || digit_val(S.ch) < 10 {
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S.Next();
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}
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end := S.pos - 1;
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var tok int;
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var present bool;
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tok, present = Keywords[S.src[beg : end]];
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if !present {
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tok = IDENT;
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}
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return tok;
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}
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func (S *Scanner) ScanMantissa (base int) {
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for digit_val(S.ch) < base {
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S.Next();
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}
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}
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func (S *Scanner) ScanNumber (seen_decimal_point bool) int {
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if seen_decimal_point {
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S.ScanMantissa(10);
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goto exponent;
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}
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if S.ch == '0' {
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// int or float
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S.Next();
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if S.ch == 'x' || S.ch == 'X' {
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// hexadecimal int
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S.Next();
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S.ScanMantissa(16);
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} else {
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// octal int or float
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S.ScanMantissa(8);
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if digit_val(S.ch) < 10 || S.ch == '.' || S.ch == 'e' || S.ch == 'E' {
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// float
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goto mantissa;
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}
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// octal int
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}
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return NUMBER;
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}
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mantissa:
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// decimal int or float
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S.ScanMantissa(10);
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if S.ch == '.' {
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// float
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S.Next();
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S.ScanMantissa(10)
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}
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exponent:
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if S.ch == 'e' || S.ch == 'E' {
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// float
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S.Next();
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if S.ch == '-' || S.ch == '+' {
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S.Next();
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}
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S.ScanMantissa(10);
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}
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return NUMBER;
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}
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func (S *Scanner) ScanDigits(n int, base int) {
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for digit_val(S.ch) < base {
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S.Next();
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n--;
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}
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if n > 0 {
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S.Error(S.chpos, "illegal char escape");
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}
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}
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func (S *Scanner) ScanEscape () string {
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// TODO: fix this routine
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ch := S.ch;
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pos := S.chpos;
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S.Next();
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switch (ch) {
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case 'a', 'b', 'f', 'n', 'r', 't', 'v', '\\', '\'', '"':
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return string(ch);
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|
|
case '0', '1', '2', '3', '4', '5', '6', '7':
|
|
S.ScanDigits(3 - 1, 8); // 1 char already read
|
|
return ""; // TODO fix this
|
|
|
|
case 'x':
|
|
S.ScanDigits(2, 16);
|
|
return ""; // TODO fix this
|
|
|
|
case 'u':
|
|
S.ScanDigits(4, 16);
|
|
return ""; // TODO fix this
|
|
|
|
case 'U':
|
|
S.ScanDigits(8, 16);
|
|
return ""; // TODO fix this
|
|
|
|
default:
|
|
S.Error(pos, "illegal char escape");
|
|
}
|
|
}
|
|
|
|
|
|
func (S *Scanner) ScanChar () int {
|
|
// '\'' already consumed
|
|
|
|
ch := S.ch;
|
|
S.Next();
|
|
if ch == '\\' {
|
|
S.ScanEscape();
|
|
}
|
|
|
|
S.Expect('\'');
|
|
return NUMBER;
|
|
}
|
|
|
|
|
|
func (S *Scanner) ScanString () int {
|
|
// '"' already consumed
|
|
|
|
pos := S.chpos - 1;
|
|
for S.ch != '"' {
|
|
ch := S.ch;
|
|
S.Next();
|
|
if ch == '\n' || ch < 0 {
|
|
S.Error(pos, "string not terminated");
|
|
break;
|
|
}
|
|
if ch == '\\' {
|
|
S.ScanEscape();
|
|
}
|
|
}
|
|
|
|
S.Next();
|
|
return STRING;
|
|
}
|
|
|
|
|
|
func (S *Scanner) ScanRawString () int {
|
|
// '`' already consumed
|
|
|
|
pos := S.chpos - 1;
|
|
for S.ch != '`' {
|
|
ch := S.ch;
|
|
S.Next();
|
|
if ch == '\n' || ch < 0 {
|
|
S.Error(pos, "string not terminated");
|
|
break;
|
|
}
|
|
}
|
|
|
|
S.Next();
|
|
return STRING;
|
|
}
|
|
|
|
|
|
func (S *Scanner) Select2 (tok0, tok1 int) int {
|
|
if S.ch == '=' {
|
|
S.Next();
|
|
return tok1;
|
|
}
|
|
return tok0;
|
|
}
|
|
|
|
|
|
func (S *Scanner) Select3 (tok0, tok1, ch2, tok2 int) int {
|
|
if S.ch == '=' {
|
|
S.Next();
|
|
return tok1;
|
|
}
|
|
if S.ch == ch2 {
|
|
S.Next();
|
|
return tok2;
|
|
}
|
|
return tok0;
|
|
}
|
|
|
|
|
|
func (S *Scanner) Select4 (tok0, tok1, ch2, tok2, tok3 int) int {
|
|
if S.ch == '=' {
|
|
S.Next();
|
|
return tok1;
|
|
}
|
|
if S.ch == ch2 {
|
|
S.Next();
|
|
if S.ch == '=' {
|
|
S.Next();
|
|
return tok3;
|
|
}
|
|
return tok2;
|
|
}
|
|
return tok0;
|
|
}
|
|
|
|
|
|
func (S *Scanner) Scan () (tok, beg, end int) {
|
|
S.SkipWhitespace();
|
|
|
|
ch := S.ch;
|
|
tok = ILLEGAL;
|
|
beg = S.chpos;
|
|
|
|
switch {
|
|
case is_letter(ch): tok = S.ScanIdentifier();
|
|
case digit_val(ch) < 10: tok = S.ScanNumber(false);
|
|
default:
|
|
S.Next(); // always make progress
|
|
switch ch {
|
|
case -1: tok = EOF;
|
|
case '"': tok = S.ScanString();
|
|
case '\'': tok = S.ScanChar();
|
|
case '`': tok = S.ScanRawString();
|
|
case ':': tok = S.Select2(COLON, DEFINE);
|
|
case '.':
|
|
if digit_val(S.ch) < 10 {
|
|
tok = S.ScanNumber(true);
|
|
} else {
|
|
tok = PERIOD;
|
|
}
|
|
case ',': tok = COMMA;
|
|
case ';': tok = SEMICOLON;
|
|
case '(': tok = LPAREN;
|
|
case ')': tok = RPAREN;
|
|
case '[': tok = LBRACK;
|
|
case ']': tok = RBRACK;
|
|
case '{': tok = LBRACE;
|
|
case '}': tok = RBRACE;
|
|
case '+': tok = S.Select3(ADD, ADD_ASSIGN, '+', INC);
|
|
case '-': tok = S.Select3(SUB, SUB_ASSIGN, '-', DEC);
|
|
case '*': tok = S.Select2(MUL, MUL_ASSIGN);
|
|
case '/':
|
|
if S.ch == '/' || S.ch == '*' {
|
|
S.SkipComment();
|
|
// cannot simply return because of 6g bug
|
|
tok, beg, end = S.Scan();
|
|
return tok, beg, end;
|
|
}
|
|
tok = S.Select2(QUO, QUO_ASSIGN);
|
|
case '%': tok = S.Select2(REM, REM_ASSIGN);
|
|
case '^': tok = S.Select2(XOR, XOR_ASSIGN);
|
|
case '<': tok = S.Select4(LSS, LEQ, '<', SHL, SHL_ASSIGN);
|
|
case '>': tok = S.Select4(GTR, GEQ, '>', SHR, SHR_ASSIGN);
|
|
case '=': tok = S.Select2(ASSIGN, EQL);
|
|
case '!': tok = S.Select2(NOT, NEQ);
|
|
case '&': tok = S.Select3(AND, AND_ASSIGN, '&', LAND);
|
|
case '|': tok = S.Select3(OR, OR_ASSIGN, '|', LOR);
|
|
default:
|
|
S.Error(beg, "illegal character " + CharString(ch));
|
|
tok = ILLEGAL;
|
|
}
|
|
}
|
|
|
|
return tok, beg, S.chpos;
|
|
}
|