chevrotain/lib/src/parse/cst/cst.js

Chevrotain is a high performance fault tolerant javascript parsing DSL for building recursive decent parsers

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.addNoneTerminalToCst = exports.addTerminalToCst = exports.setNodeLocationFull = exports.setNodeLocationOnlyOffset = void 0;
/**
 * This nodeLocation tracking is not efficient and should only be used
 * when error recovery is enabled or the Token Vector contains virtual Tokens
 * (e.g, Python Indent/Outdent)
 * As it executes the calculation for every single terminal/nonTerminal
 * and does not rely on the fact the token vector is **sorted**
 */
function setNodeLocationOnlyOffset(currNodeLocation, newLocationInfo) {
    // First (valid) update for this cst node
    if (isNaN(currNodeLocation.startOffset) === true) {
        // assumption1: Token location information is either NaN or a valid number
        // assumption2: Token location information is fully valid if it exist
        // (both start/end offsets exist and are numbers).
        currNodeLocation.startOffset = newLocationInfo.startOffset;
        currNodeLocation.endOffset = newLocationInfo.endOffset;
    }
    // Once the startOffset has been updated with a valid number it should never receive
    // any farther updates as the Token vector is sorted.
    // We still have to check this this condition for every new possible location info
    // because with error recovery enabled we may encounter invalid tokens (NaN location props)
    else if (currNodeLocation.endOffset < newLocationInfo.endOffset === true) {
        currNodeLocation.endOffset = newLocationInfo.endOffset;
    }
}
exports.setNodeLocationOnlyOffset = setNodeLocationOnlyOffset;
/**
 * This nodeLocation tracking is not efficient and should only be used
 * when error recovery is enabled or the Token Vector contains virtual Tokens
 * (e.g, Python Indent/Outdent)
 * As it executes the calculation for every single terminal/nonTerminal
 * and does not rely on the fact the token vector is **sorted**
 */
function setNodeLocationFull(currNodeLocation, newLocationInfo) {
    // First (valid) update for this cst node
    if (isNaN(currNodeLocation.startOffset) === true) {
        // assumption1: Token location information is either NaN or a valid number
        // assumption2: Token location information is fully valid if it exist
        // (all start/end props exist and are numbers).
        currNodeLocation.startOffset = newLocationInfo.startOffset;
        currNodeLocation.startColumn = newLocationInfo.startColumn;
        currNodeLocation.startLine = newLocationInfo.startLine;
        currNodeLocation.endOffset = newLocationInfo.endOffset;
        currNodeLocation.endColumn = newLocationInfo.endColumn;
        currNodeLocation.endLine = newLocationInfo.endLine;
    }
    // Once the start props has been updated with a valid number it should never receive
    // any farther updates as the Token vector is sorted.
    // We still have to check this this condition for every new possible location info
    // because with error recovery enabled we may encounter invalid tokens (NaN location props)
    else if (currNodeLocation.endOffset < newLocationInfo.endOffset === true) {
        currNodeLocation.endOffset = newLocationInfo.endOffset;
        currNodeLocation.endColumn = newLocationInfo.endColumn;
        currNodeLocation.endLine = newLocationInfo.endLine;
    }
}
exports.setNodeLocationFull = setNodeLocationFull;
function addTerminalToCst(node, token, tokenTypeName) {
    if (node.children[tokenTypeName] === undefined) {
        node.children[tokenTypeName] = [token];
    }
    else {
        node.children[tokenTypeName].push(token);
    }
}
exports.addTerminalToCst = addTerminalToCst;
function addNoneTerminalToCst(node, ruleName, ruleResult) {
    if (node.children[ruleName] === undefined) {
        node.children[ruleName] = [ruleResult];
    }
    else {
        node.children[ruleName].push(ruleResult);
    }
}
exports.addNoneTerminalToCst = addNoneTerminalToCst;
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