private List <Expression> EnumerateTaggedExpressionsForStringInterpolation(ITemplateExpression template, FunctionScope escapes, QualifierSpaceId currentQualifierSpaceId)
{
// Creating a list that will hold all potential expressions
List <Expression> result = new List <Expression>((template.TemplateSpans.Length * 2) + 1);
var head = template.Head.Text;
if (!string.IsNullOrEmpty(head))
{
result.Add(LiteralConverter.ConvertStringLiteral(head, Location(template.Head)));
}
for (int i = 0; i < template.TemplateSpans.Length; i++)
{
var span = template.TemplateSpans[i];
if (span.Expression != null)
{
var convertedExpression = m_converter.ConvertExpression(span.Expression, escapes, currentQualifierSpaceId);
if (convertedExpression != null)
{
result.Add(convertedExpression);
}
}
var fragment = span.Literal.Text;
if (!string.IsNullOrEmpty(fragment))
{
result.Add(LiteralConverter.ConvertStringLiteral(fragment, Location(template.Head)));
}
}
return(result);
}
public static void Validation(this ITemplateExpression expression, string s)
{
if (!Validation(s))
{
throw new Exception(string.Format("配置键和配置值均不能包含{0}字符", SPLITESPACER));
}
}
private void AnalyzeTemplateExpression(ITemplateExpression source, int idx)
{
foreach (var t in source.Cast <ITemplateExpression>().TemplateSpans.AsStructEnumerable())
{
AnalyzeExpression(t.Expression, idx);
}
}
public static void FromValues(this ITemplateExpression expression, IEnumerable <string> values)
{
foreach (string value in values)
{
Validation(value);
}
expression.Value = string.Join(SPLITESPACER, values.ToArray());
}
public static void FromKeys(this ITemplateExpression expression, IEnumerable <string> keys)
{
foreach (string key in keys)
{
Validation(key);
}
expression.Expression = string.Join(SPLITESPACER, keys.ToArray());
}
private static int ComparePathTemplateExpression(ITemplateExpression left, ITemplateExpression right)
{
Contract.Requires(left != null);
Contract.Requires(right != null);
var leftSteps = new List <Tuple <PathStepKind, string> >();
var rightSteps = new List <Tuple <PathStepKind, string> >();
CollectSteps(left, leftSteps);
CollectSteps(right, rightSteps);
return(ComparePathSteps(leftSteps, rightSteps));
}
private static int CompareTemplateExpression(ITemplateExpression left, ITemplateExpression right, bool usePathCompareSemantics = false)
{
// Standard left,right and null checks
if (left == null && right == null)
{
return(0);
}
if (left == null)
{
return(1);
}
if (right == null)
{
return(-1);
}
if (usePathCompareSemantics)
{
return(ComparePathTemplateExpression(left, right));
}
int result = 0;
if (left.Head != null)
{
if (right.Head != null)
{
result = CompareStringLiteralExpression(left.Head.Cast <ILiteralExpression>(), right.Head.Cast <ILiteralExpression>(), usePathCompareSemantics);
}
else
{
return(-1); // Literals win over expressions;
}
}
else if (right.Head == null)
{
return(1); // Literals win over expressions
}
if (result != 0)
{
return(result);
}
return(CompareNodeArrays(left.TemplateSpans, right.TemplateSpans, (l, r) => CompareTemplateSpan(l, r, usePathCompareSemantics)));
}
public static void AppendConfig(this ITemplateExpression expression, string Key, string Value)
{
if (string.IsNullOrEmpty(Key))
{
throw new Exception("配置键不能为空");
}
expression.Validation(Key);
expression.Validation(Value);
Dictionary <string, string> dic = new Dictionary <string, string>();
foreach (KeyValuePair <string, string> pair in expression.ToKeyValuePairs())
{
dic.Add(pair.Key, pair.Value);
}
dic.Add(Key, Value);
expression.FromKeys(dic.Keys);
expression.FromValues(dic.Values);
}
/// <summary>
/// Converts string interpolation expression like <code>let x = `${foo}`;</code>
/// </summary>
public Expression ConvertStringInterpolation(ITemplateExpression source, FunctionScope escapes, QualifierSpaceId currentQualifierSpaceId)
{
var taggedExpressions = EnumerateTaggedExpressionsForStringInterpolation(source, escapes, currentQualifierSpaceId);
// There is one corner cases here:
// If tagged expression is just a string literal, but has no expressions, we can just return it
if (taggedExpressions.Count == 1)
{
if (taggedExpressions[0] is StringLiteral stringLiteral)
{
return(stringLiteral);
}
}
var applyExpression = ApplyExpression.Create(m_stringInterpolationSelectorExpression, taggedExpressions.ToArray(), LineInfo(source));
return(new StringLiteralExpression(applyExpression, applyExpression.Location));
}
private static void CollectSteps(ITemplateExpression template, List <Tuple <PathStepKind, string> > steps)
{
if (template.Head != null)
{
CollectSteps(template.Head.Text, steps);
}
foreach (var span in template.TemplateSpans.AsStructEnumerable())
{
if (span.Expression != null)
{
steps.Add(Tuple.Create(PathStepKind.Expression, span.Expression.ToDisplayString()));
}
if (span.Literal != null)
{
CollectSteps(span.Literal.Text, steps);
}
}
}
public static IEnumerable <KeyValuePair <string, string> > ToKeyValuePairs(this ITemplateExpression expression)
{
Dictionary <string, string> dic = new Dictionary <string, string>();
string[] exs = expression.Expression.Split(new string[] { SPLITESPACER }, StringSplitOptions.RemoveEmptyEntries);
string[] vas = expression.Value.Split(new string[] { SPLITESPACER }, StringSplitOptions.None);
if (exs.Length > 0)
{
if (exs.Length != vas.Length)
{
throw new Exception("表达式跟值不匹配，请确保他们的元素一样多");
}
for (int i = 0; i < exs.Length; i++)
{
dic[exs[i]] = vas[i];
}
}
return(dic);
}
private static int FitsOnOneLine(ITemplateExpression expression, int remainingSpace)
{
// This is a recursion on the pretty printer which is not nice, but it is the simplest for now
return(remainingSpace - expression.GetFormattedText().Length);
}