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107 lines
3.6 KiB
107 lines
3.6 KiB
/* Copyright 2013 Prometheus Team |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. */ |
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%{ |
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package rules |
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import ( |
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"fmt" |
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"strconv" |
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"strings" |
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clientmodel "github.com/prometheus/client_golang/model" |
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) |
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// Lex is called by the parser generated by "go tool yacc" to obtain each |
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// token. The method is opened before the matching rules block and closed at |
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// the end of the file. |
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func (lexer *RulesLexer) Lex(lval *yySymType) int { |
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// Internal lexer states. |
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const ( |
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S_INITIAL = iota |
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S_COMMENTS |
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) |
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// We simulate multiple start symbols for closely-related grammars via dummy tokens. See |
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// http://www.gnu.org/software/bison/manual/html_node/Multiple-start_002dsymbols.html |
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// Reason: we want to be able to parse lists of named rules as well as single expressions. |
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if lexer.startToken != 0 { |
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startToken := lexer.startToken |
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lexer.startToken = 0 |
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return startToken |
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} |
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c := lexer.current |
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currentState := 0 |
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if lexer.empty { |
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c, lexer.empty = lexer.getChar(), false |
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} |
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%} |
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D [0-9] |
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L [a-zA-Z_:] |
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U [smhdwy] |
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%x S_COMMENTS |
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%yyc c |
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%yyn c = lexer.getChar() |
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%yyt currentState |
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%% |
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lexer.buf = lexer.buf[:0] // The code before the first rule executed before every scan cycle (rule #0 / state 0 action) |
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"/*" currentState = S_COMMENTS |
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<S_COMMENTS>"*/" currentState = S_INITIAL |
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<S_COMMENTS>.|\n /* ignore chars within multi-line comments */ |
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\/\/[^\r\n]*\n /* gobble up one-line comments */ |
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ALERT|alert return ALERT |
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IF|if return IF |
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FOR|for return FOR |
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WITH|with return WITH |
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SUMMARY|summary return SUMMARY |
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DESCRIPTION|description return DESCRIPTION |
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PERMANENT|permanent return PERMANENT |
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BY|by return GROUP_OP |
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AVG|SUM|MAX|MIN|COUNT lval.str = lexer.token(); return AGGR_OP |
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avg|sum|max|min|count lval.str = strings.ToUpper(lexer.token()); return AGGR_OP |
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\<|>|AND|OR|and|or lval.str = strings.ToUpper(lexer.token()); return CMP_OP |
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==|!=|>=|<= lval.str = lexer.token(); return CMP_OP |
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[+\-] lval.str = lexer.token(); return ADDITIVE_OP |
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[*/%] lval.str = lexer.token(); return MULT_OP |
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{D}+{U} lval.str = lexer.token(); return DURATION |
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{L}({L}|{D})* lval.str = lexer.token(); return IDENTIFIER |
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\-?{D}+(\.{D}*)? num, err := strconv.ParseFloat(lexer.token(), 64); |
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if (err != nil && err.(*strconv.NumError).Err == strconv.ErrSyntax) { |
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panic("Invalid float") |
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} |
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lval.num = clientmodel.SampleValue(num) |
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return NUMBER |
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\"(\\.|[^\\"])*\" lval.str = lexer.token()[1:len(lexer.token()) - 1]; return STRING |
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\'(\\.|[^\\'])*\' lval.str = lexer.token()[1:len(lexer.token()) - 1]; return STRING |
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[{}\[\]()=,] return int(lexer.buf[0]) |
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[\t\n\r ] /* gobble up any whitespace */ |
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%% |
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lexer.empty = true |
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return int(c) |
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}
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