You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
143 lines
4.8 KiB
143 lines
4.8 KiB
// Copyright 2013 Google, Inc. All rights reserved.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
// Gypsy is a simplified YAML parser written in Go. It is intended to be used as
|
|
// a simple configuration file, and as such does not support a lot of the more
|
|
// nuanced syntaxes allowed in full-fledged YAML. YAML does not allow indent with
|
|
// tabs, and GYPSY does not ever consider a tab to be a space character. It is
|
|
// recommended that your editor be configured to convert tabs to spaces when
|
|
// editing Gypsy config files.
|
|
//
|
|
// Gypsy understands the following to be a list:
|
|
//
|
|
// - one
|
|
// - two
|
|
// - three
|
|
//
|
|
// This is parsed as a `yaml.List`, and can be retrieved from the
|
|
// `yaml.Node.List()` method. In this case, each element of the `yaml.List` would
|
|
// be a `yaml.Scalar` whose value can be retrieved with the `yaml.Scalar.String()`
|
|
// method.
|
|
//
|
|
// Gypsy understands the following to be a mapping:
|
|
//
|
|
// key: value
|
|
// foo: bar
|
|
// running: away
|
|
//
|
|
// A mapping is an unordered list of `key:value` pairs. All whitespace after the
|
|
// colon is stripped from the value and is used for alignment purposes during
|
|
// export. If the value is not a list or a map, everything after the first
|
|
// non-space character until the end of the line is used as the `yaml.Scalar`
|
|
// value.
|
|
//
|
|
// Gypsy allows arbitrary nesting of maps inside lists, lists inside of maps, and
|
|
// maps and/or lists nested inside of themselves.
|
|
//
|
|
// A map inside of a list:
|
|
//
|
|
// - name: John Smith
|
|
// age: 42
|
|
// - name: Jane Smith
|
|
// age: 45
|
|
//
|
|
// A list inside of a map:
|
|
//
|
|
// schools:
|
|
// - Meadow Glen
|
|
// - Forest Creek
|
|
// - Shady Grove
|
|
// libraries:
|
|
// - Joseph Hollingsworth Memorial
|
|
// - Andrew Keriman Memorial
|
|
//
|
|
// A list of lists:
|
|
//
|
|
// - - one
|
|
// - two
|
|
// - three
|
|
// - - un
|
|
// - deux
|
|
// - trois
|
|
// - - ichi
|
|
// - ni
|
|
// - san
|
|
//
|
|
// A map of maps:
|
|
//
|
|
// google:
|
|
// company: Google, Inc.
|
|
// ticker: GOOG
|
|
// url: http://google.com/
|
|
// yahoo:
|
|
// company: Yahoo, Inc.
|
|
// ticker: YHOO
|
|
// url: http://yahoo.com/
|
|
//
|
|
// In the case of a map of maps, all sub-keys must be on subsequent lines and
|
|
// indented equally. It is allowable for the first key/value to be on the same
|
|
// line if there is more than one key/value pair, but this is not recommended.
|
|
//
|
|
// Values can also be expressed in long form (leading whitespace of the first line
|
|
// is removed from it and all subsequent lines). In the normal (baz) case,
|
|
// newlines are treated as spaces, all indentation is removed. In the folded case
|
|
// (bar), newlines are treated as spaces, except pairs of newlines (e.g. a blank
|
|
// line) are treated as a single newline, only the indentation level of the first
|
|
// line is removed, and newlines at the end of indented lines are preserved. In
|
|
// the verbatim (foo) case, only the indent at the level of the first line is
|
|
// stripped. The example:
|
|
//
|
|
// foo: |
|
|
// lorem ipsum dolor
|
|
// sit amet
|
|
// bar: >
|
|
// lorem ipsum
|
|
//
|
|
// dolor
|
|
//
|
|
// sit amet
|
|
// baz:
|
|
// lorem ipsum
|
|
// dolor sit amet
|
|
//
|
|
// The YAML subset understood by Gypsy can be expressed (loosely) in the following
|
|
// grammar (not including comments):
|
|
//
|
|
// OBJECT = MAPPING | SEQUENCE | SCALAR .
|
|
// SHORT-OBJECT = SHORT-MAPPING | SHORT-SEQUENCE | SHORT-SCALAR .
|
|
// EOL = '\n'
|
|
//
|
|
// MAPPING = { LONG-MAPPING | SHORT-MAPPING } .
|
|
// SEQUENCE = { LONG-SEQUENCE | SHORT-SEQUENCE } .
|
|
// SCALAR = { LONG-SCALAR | SHORT-SCALAR } .
|
|
//
|
|
// LONG-MAPPING = { INDENT KEY ':' OBJECT EOL } .
|
|
// SHORT-MAPPING = '{' KEY ':' SHORT-OBJECT { ',' KEY ':' SHORT-OBJECT } '}' EOL .
|
|
//
|
|
// LONG-SEQUENCE = { INDENT '-' OBJECT EOL } EOL .
|
|
// SHORT-SEQUENCE = '[' SHORT-OBJECT { ',' SHORT-OBJECT } ']' EOL .
|
|
//
|
|
// LONG-SCALAR = ( '|' | '>' | ) EOL { INDENT SHORT-SCALAR EOL }
|
|
// SHORT-SCALAR = { alpha | digit | punct | ' ' | '\t' } .
|
|
//
|
|
// KEY = { alpha | digit }
|
|
// INDENT = { ' ' }
|
|
//
|
|
// Any line where the first non-space character is a sharp sign (#) is a comment.
|
|
// It will be ignored.
|
|
// Only full-line comments are allowed.
|
|
package yaml
|
|
|
|
// BUG(kevlar): Multi-line strings are currently not supported.
|