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use ast;
use std::fmt;
use std::error;
use colored::*;
use util;
use grammar;
const ERROR_CONTEXT_LINES: usize = 5;
#[derive(Debug, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "lowercase", deny_unknown_fields)]
pub enum MWError {
ParseError(ParseError),
TransformationError(TransformationError),
}
#[derive(Debug, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "lowercase", deny_unknown_fields)]
pub struct ParseError {
pub position: ast::Position,
pub expected: Vec<String>,
pub context: Vec<String>,
pub context_start: usize,
pub context_end: usize,
}
#[derive(Debug, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "lowercase", deny_unknown_fields)]
pub struct TransformationError {
pub cause: String,
pub position: ast::Span,
pub transformation_name: String,
pub tree: ast::Element,
}
impl ParseError {
pub fn from(err: &grammar::ParseError, input: &str) -> Self {
let source_lines = util::get_source_lines(input);
let line_count = source_lines.len();
let line = if err.line <= line_count {
err.line
} else {
source_lines.len()
} - 1;
let start = if line < ERROR_CONTEXT_LINES {
0
} else {
line - ERROR_CONTEXT_LINES
};
let end = if line + ERROR_CONTEXT_LINES >= line_count {
line_count - 1
} else {
line + ERROR_CONTEXT_LINES
};
let mut token_str = vec![];
for token in &err.expected {
token_str.push(String::from(*token));
}
let mut context = vec![];
for sloc in source_lines[start..end + 1].iter() {
context.push(String::from(sloc.content));
}
ParseError {
position: ast::Position::new(err.offset, &source_lines),
context: context,
expected: token_str,
context_start: start,
context_end: end,
}
}
}
impl error::Error for ParseError {
fn description(&self) -> &str {
"Could not continue to parse, because no rules could be matched."
}
}
impl fmt::Display for ParseError {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
let error_message = format!(
"ERROR in line {} at column {}: Could not continue to parse, expected one of: ",
self.position.line,
self.position.col
).red()
.bold();
let mut token_str = vec![];
for token in &self.expected {
if util::is_whitespace(token) {
token_str.push(format!("{:?}", token));
} else {
token_str.push(format!("{}", token));
}
}
write!(f, "{}", error_message)?;
write!(f, "{}\n", token_str.join(", ").blue().bold())?;
for (i, content) in self.context.iter().enumerate() {
let lineno = format!("{} |", self.context_start + i + 1);
let lineno_col;
let formatted_content;
if self.context_start + i + 1 == self.position.line {
formatted_content = content.red();
lineno_col = lineno.red().bold();
} else {
formatted_content = util::shorten_str(content).normal();
lineno_col = lineno.blue().bold()
}
writeln!(f, "{} {}", lineno_col, formatted_content)?;
}
Ok(())
}
}
impl error::Error for TransformationError {
fn description(&self) -> &str {
&self.cause
}
}
impl fmt::Display for TransformationError {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
let message = format!(
"ERROR applying transformation \"{}\" to Elemtn at {}:{} to {}:{}: {}",
self.transformation_name,
self.position.start.line,
self.position.start.col,
self.position.end.line,
self.position.end.col,
self.cause
);
writeln!(f, "{}", message.red().bold())
}
}
impl error::Error for MWError {
fn description(&self) -> &str {
match *self {
MWError::ParseError(ref e) => e.description(),
MWError::TransformationError(ref e) => e.description(),
}
}
}
impl fmt::Display for MWError {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
match *self {
MWError::ParseError(ref e) => write!(f, "{}", e),
MWError::TransformationError(ref e) => write!(f, "{}", e),
}
}
}