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618abf4379
This is especially important now that we leak the rule names into the `SyntaxError` message. For example, the error message when doing `jj diff -r :` will now mention "expected parents_op, ancestors_op, or primary". It seems much clearer with the "_op" suffixes there. Longer term, we should think more about how we can best surface syntax errors from the library crate.
59 lines
2 KiB
Text
59 lines
2 KiB
Text
// Copyright 2021 Google LLC
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//
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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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// https://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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symbol = @{ (ASCII_ALPHANUMERIC | "@" | "/" | ".")+ }
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literal_string = { "\"" ~ (!"\"" ~ ANY)+ ~ "\"" }
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whitespace = _{ " " }
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parents_op = { ":" }
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ancestors_op = { "*:" }
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prefix_op = _{ parents_op | ancestors_op }
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union_op = { "|" }
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intersection_op = { "&" }
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difference_op = { "-" }
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infix_op = _{ union_op | intersection_op | difference_op }
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function_name = @{ (ASCII_ALPHANUMERIC | "_")+ }
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// The grammar accepts a string literal or an expression for function
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// arguments. We then decide when walking the parse tree if we
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// should interpret the string value of the literal string or the expression
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// as a string or an expression, or maybe as an integer. For example,
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// parents(foo) might interpret "foo" as an expression, while limit(*:foo,5)
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// might interpret its second argument as an integer. Also, parents("foo")
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// might be disallowed, just as description(heads()) might be.
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function_argument = {
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literal_string
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| expression
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}
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function_arguments = {
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(whitespace* ~ function_argument ~ whitespace* ~ ",")* ~ whitespace* ~ function_argument ~ whitespace*
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| whitespace*
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}
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primary = {
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function_name ~ "(" ~ function_arguments ~ ")"
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| "(" ~ expression ~ ")"
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| symbol
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}
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prefix_expression = { prefix_op* ~ primary }
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infix_expression = {
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whitespace* ~ prefix_expression ~ whitespace* ~ (infix_op ~ whitespace* ~ prefix_expression ~ whitespace*)*
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}
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expression = {
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whitespace* ~ infix_expression ~ whitespace*
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}
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