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/* Copyright 2022 Mozilla Foundation
*
* 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.
*/
/// This module has a bare-bones "syntax tree" that helps us output more readable JS code in our
/// tests. This is a lot cheaper and faster than running a full JS formatter on the generated code.
/// The tree only has node types for things that matter to formatting; most things in the output
/// use the Raw type, which is just a plain old string.
pub const LINE_WIDTH: usize = 80; // the default line width to try to meet (will not be met perfectly)
pub const NOWRAP: usize = 1000; // use for line_remaining when you don't want to wrap text
pub enum JSNode {
Assert {
name: String,
exec: Box<JSNode>,
expected: Box<JSNode>,
},
Invoke {
instance: String,
name: String,
body: Box<JSNode>,
},
Call {
name: String,
args: Vec<Box<JSNode>>,
},
Array(Vec<Box<JSNode>>),
Raw(String),
}
impl JSNode {
/// Converts a node to JavaScript code. line_remaining is the number of characters remaining on
/// the line, used for line-wrapping purposes; if zero, the default LINE_WIDTH will be used.
pub fn output(&self, line_remaining: usize) -> String {
let line_remaining = if line_remaining == 0 {
LINE_WIDTH
} else {
line_remaining
};
match self {
Self::Assert {
name,
exec,
expected,
} => {
if self.len() > line_remaining {
format!(
"{}(\n{}\n)",
name,
indent(format!(
"() => {},\n{},",
exec.output(line_remaining - 8),
expected.output(line_remaining - 2),
)),
)
} else {
format!(
"{}(() => {}, {})",
name,
exec.output(NOWRAP),
expected.output(NOWRAP),
)
}
}
Self::Invoke {
instance,
name,
body,
} => {
let body_string =
body.output(line_remaining - "invoke".len() - instance.len() - name.len());
format!("invoke({}, `{}`, {})", instance, name, body_string)
}
Self::Call { name, args } => {
if self.len() > line_remaining {
let arg_strings: Vec<String> = args
.iter()
.map(|arg| arg.output(line_remaining - 2))
.collect();
format!("{}(\n{},\n)", name, indent(arg_strings.join(",\n")))
} else {
let arg_strings: Vec<String> =
args.iter().map(|arg| arg.output(NOWRAP)).collect();
format!("{}({})", name, arg_strings.join(", "))
}
}
Self::Array(values) => {
if self.len() > line_remaining {
let value_strings = output_nodes(&values, 70);
format!("[\n{},\n]", indent(value_strings.join(",\n")))
} else {
let value_strings = output_nodes(&values, 80);
format!("[{}]", value_strings.join(", "))
}
}
Self::Raw(val) => val.to_string(),
}
}
/// A rough estimate of the string length of the node. Used as a heuristic to know when we
/// should wrap text.
fn len(&self) -> usize {
match self {
Self::Assert {
name,
exec,
expected,
} => name.len() + exec.len() + expected.len(),
Self::Invoke {
instance,
name,
body,
} => instance.len() + name.len() + body.len(),
Self::Call { name, args } => {
let mut args_len: usize = 0;
for node in args {
args_len += node.len() + ", ".len();
}
name.len() + args_len
}
Self::Array(nodes) => {
let mut content_len: usize = 0;
for node in nodes {
content_len += node.len() + ", ".len();
}
content_len
}
Self::Raw(s) => s.len(),
}
}
}
pub fn output_nodes(nodes: &Vec<Box<JSNode>>, line_width_per_node: usize) -> Vec<String> {
nodes
.iter()
.map(|node| node.output(line_width_per_node))
.collect()
}
pub fn strings_to_raws(strs: Vec<String>) -> Vec<Box<JSNode>> {
let mut res: Vec<Box<JSNode>> = vec![];
for s in strs {
res.push(Box::new(JSNode::Raw(s)));
}
res
}
fn indent(s: String) -> String {
let mut result = String::new();
let mut do_indent = true;
for (i, line) in s.lines().enumerate() {
if i > 0 {
result.push('\n');
}
if line.chars().any(|c| !c.is_whitespace()) {
if do_indent {
result.push_str(" ");
}
result.push_str(line);
// An odd number of backticks in the line means we are entering or exiting a raw string.
if line.matches("`").count() % 2 == 1 {
do_indent = !do_indent
}
}
}
result
}
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