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const STATE_PREFIX = 1; // '@' prefix that denotes the start of an expression
const STATE_IDENTIFIER = 2; // the identifier part, e.g. 'contact.age' in '@contact.age'
const STATE_BALANCED = 3; // the balanced parentheses delimited part, e.g. '(1 + 2)' in '@(1 + 2)'
const STATE_STRING_LITERAL = 4; // a string literal which could contain )
const STATE_ESCAPED_PREFIX = 5; // a '@' prefix preceded by another '@'
const STATE_IGNORE = 6;
export interface Expression {
start: number;
end: number;
text: string;
closed: boolean;
}
/**
* Determines whether the given string starts with the given text
*/
const startsWith = (str: string, start: string): boolean => {
return str.indexOf(start, 0) === 0;
};
/**
* Checks the parsed (possibly partial) expression to determine if it's valid based on how it starts
*/
const isValidStart = (
partialExpression: string,
allowedTopLevels: string[],
allowIncomplete: boolean
): boolean => {
const body = partialExpression.substring(1); // strip prefix
if (body[0] === '(') {
return true;
} else {
// if expression doesn't start with ( then check it's an allowed top level context reference
const topLevel = body.split('.')[0].toLowerCase();
if (allowIncomplete) {
for (const allowed of allowedTopLevels) {
if (startsWith(allowed, topLevel)) {
return true;
}
}
} else {
return allowedTopLevels.indexOf(topLevel) >= 0;
}
return false;
}
};
/**
* Determines whether the given character is a word character, i.e. \w in a regex
*/
export const isWordChar = (ch: string | 0): boolean => {
return (
(ch >= 'a' && ch <= 'z') ||
(ch >= 'A' && ch <= 'Z') ||
(ch >= '0' && ch <= '9') ||
ch === '_'
);
};
/**
* Determines whether we are in a string literal
*/
const isInStringLiteral = (partialExpression: string): boolean => {
// count number quotation marks
let numQuotes = 0;
for (const pos of partialExpression) {
if (pos === '"') {
numQuotes++;
}
}
return numQuotes % 2 !== 0; // odd means last string literal is open
};
export default class ExcellentParser {
private expressionPrefix: string;
private allowedTopLevels: string[];
/**
* Creates a new parser
* @param expressionPrefix the prefix for expressions, e.g. '@'
* @param allowedTopLevels the context names that are allowed without parentheses, e.g. ["contact", "flow", ...]
*/
constructor(expressionPrefix: string, allowedTopLevels: string[]) {
this.expressionPrefix = expressionPrefix;
this.allowedTopLevels = allowedTopLevels;
}
/**
* Given the text up to the caret position, returns the expression currently being edited, without its prefix
*/
public expressionContext(textToCaret: string): string {
const expressions = this.findExpressions(textToCaret);
if (expressions.length === 0) {
// no expressions found
return null;
}
const lastExpression = expressions[expressions.length - 1];
// has last expression already ended or is it closed (i.e. has balanced parentheses)
if (lastExpression.end < textToCaret.length || lastExpression.closed) {
return null;
}
return lastExpression.text.substring(1); // return without prefix
}
/**
* Given the partial expression currently being edited, returns the current auto-completable identifier
* which may be a function name or a context reference.
*/
public autoCompleteContext(partialExpression: string): string {
if (isInStringLiteral(partialExpression)) {
return null;
}
const neededParentheses = [];
let fragment = '';
let skipChar = false;
let inQuotes = false;
let prependFlag = '';
for (let pos = partialExpression.length - 1; pos >= 0; pos--) {
const ch = partialExpression[pos];
if (ch === ' ') {
skipChar = true;
}
if (ch === ',') {
skipChar = true;
if (neededParentheses[neededParentheses.length - 1] !== '(') {
neededParentheses.push('(');
}
}
if (ch === ')' && !inQuotes) {
skipChar = true;
neededParentheses.push('(');
neededParentheses.push('(');
}
if (ch === '"') {
inQuotes = !inQuotes;
}
if (skipChar) {
if (ch === '(' && !inQuotes) {
if (neededParentheses[neededParentheses.length - 1] === '(') {
neededParentheses.pop();
}
if (neededParentheses.length === 0) {
skipChar = false;
}
}
}
if (ch === '(' && fragment === '') {
prependFlag = '#';
}
if (skipChar || inQuotes || (ch === '(' && fragment === '')) {
continue;
}
if (isWordChar(ch) || ch === '.') {
fragment = ch + fragment;
} else {
break;
}
}
if (fragment.match(/[A-Za-z][\w]*(\.[\w]+)*/)) {
return prependFlag + fragment;
} else {
return null;
}
}
/**
* TODO find the function context
*/
public functionContext(partialExpression: string): string {
const inString = isInStringLiteral(partialExpression);
// initial state is string literal if number of quotes is odd
let state = inString ? STATE_STRING_LITERAL : STATE_IGNORE;
let identifier = '';
let parenthesesLevel = partialExpression[-1] === '(' ? 0 : 1;
for (let pos = partialExpression.length - 1; pos >= 0; pos--) {
const ch = partialExpression[pos];
if (ch === '@') {
return '';
}
if (state === STATE_IGNORE) {
if (parenthesesLevel === 0 && (isWordChar(ch) || ch === '.')) {
state = STATE_IDENTIFIER;
identifier = ch + identifier;
} else if (ch === '"') {
state = STATE_STRING_LITERAL;
} else if (ch === '(') {
parenthesesLevel--;
} else if (ch === ')') {
parenthesesLevel++;
}
} else if (state === STATE_IDENTIFIER) {
if (isWordChar(ch) || ch === '.') {
identifier = ch + identifier;
} else {
return identifier;
}
} else if (state === STATE_STRING_LITERAL) {
if (ch === '"') {
state = STATE_IGNORE;
}
}
}
return '';
}
public getContactFields(text: string): string[] {
const fields = {};
const re = /((parent|child\.)*contact\.)*fields\.([a-z0-9_]+)/g;
const expressions = this.findExpressions(text);
for (const expression of expressions) {
let match;
// tslint:disable-next-line:no-conditional-assignment
while ((match = re.exec(expression.text))) {
(fields as any)[match[3]] = true;
}
}
return Object.keys(fields);
}
/**
* Finds all expressions in the given text, including any partially complete expression at the end of the input
*/
public findExpressions(text: string): Expression[] {
const expressions: Expression[] = [];
let state = STATE_BODY;
let currentExpression: Expression = null;
let parenthesesLevel = 0;
for (let pos = 0; pos < text.length; pos++) {
const ch = text[pos];
// in order to determine if the b in a.b terminates an identifier, we have to peek two characters ahead as
// it could be a.b. (b terminates) or a.b.c (b doesn't terminate)
const nextCh = pos < text.length - 1 ? text[pos + 1] : 0;
const nextNextCh = pos < text.length - 2 ? text[pos + 2] : 0;
if (state === STATE_BODY) {
if (
ch === this.expressionPrefix &&
(isWordChar(nextCh) || nextCh === '(')
) {
state = STATE_PREFIX;
currentExpression = {
start: pos,
end: null,
text: ch,
closed: false
};
} else if (
ch === this.expressionPrefix &&
nextCh === this.expressionPrefix
) {
state = STATE_ESCAPED_PREFIX;
}
} else if (state === STATE_PREFIX) {
if (isWordChar(ch)) {
state = STATE_IDENTIFIER; // we're parsing an expression like @XXX
} else if (ch === '(') {
// we're parsing an expression like @(1 + 2)
state = STATE_BALANCED;
parenthesesLevel += 1;
}
currentExpression.text += ch;
} else if (state === STATE_IDENTIFIER) {
currentExpression.text += ch;
} else if (state === STATE_BALANCED) {
if (ch === '(') {
parenthesesLevel += 1;
} else if (ch === ')') {
parenthesesLevel -= 1;
} else if (ch === '"') {
state = STATE_STRING_LITERAL;
}
currentExpression.text += ch;
// expression terminates if parentheses balance
if (parenthesesLevel === 0) {
currentExpression.end = pos + 1;
}
} else if (state === STATE_STRING_LITERAL) {
if (ch === '"') {
state = STATE_BALANCED;
}
currentExpression.text += ch;
} else if (state === STATE_ESCAPED_PREFIX) {
state = STATE_BODY;
}
// identifier can terminate expression in 3 ways:
// 1. next char is null (i.e. end of the input)
// 2. next char is not a word character or period
// 3. next char is a period, but it's not followed by a word character
if (state === STATE_IDENTIFIER) {
if (
(!isWordChar(nextCh) && nextCh !== '.') ||
(nextCh === '.' && !isWordChar(nextNextCh))
) {
currentExpression.end = pos + 1;
}
}
if (
currentExpression != null &&
(currentExpression.end != null || nextCh === 0)
) {
const allowIncomplete = nextCh === 0; // if we're at the end of the input, allow incomplete expressions
if (
isValidStart(
currentExpression.text,
this.allowedTopLevels,
allowIncomplete
)
) {
currentExpression.closed =
currentExpression.text[1] === '(' && parenthesesLevel === 0;
currentExpression.end = pos + 1;
expressions.push(currentExpression);
}
currentExpression = null;
state = STATE_BODY;
}
}
return expressions;
}
}
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